LP3883ES-1.2/NOPB - NATIONAL SEMICONDUCTOR

LP3883

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LP3883 3A Fast-Response Ultra Low Dropout Linear Regulators

Check for Samples: LP3883

1FEATURES DESCRIPTION

The LP3883 is a high-current, fast-response regulator

2• Ultra Low Dropout Voltage (210 mV @ 3A typ) which can maintain output voltage regulation with

• Low Ground Pin Current minimum input to output voltage drop. Fabricated on

• Load Regulation of 0.04%/A a CMOS process, the device operates from two input

voltages: Vbias provides voltage to drive the gate of

• 60 nA Typical Quiescent Current in Shutdown the N-MOS power transistor, while Vin is the input

• 1.5% Output Accuracy (25°C) voltage which supplies power to the load. The use of

• TO-220, DDPAK/TO-263 Packages an external bias rail allows the part to operate from

ultra low Vin voltages. Unlike bipolar regulators, the

• Over Temperature/over Current Protection CMOS architecture consumes extremely low

•−40°C to +125°C Junction Temperature Range quiescent current at any output load current. The use

of an N-MOS power transistor results in wide

APPLICATIONS bandwidth, yet minimum external capacitance is

required to maintain loop stability.

• DSP Power Supplies

• Server Core and I/O Supplies The fast transient response of these devices makes

them suitable for use in powering DSP,

• Linear Power Supplies for PC Add-in-Cards Microcontroller Core voltages and Switch Mode

• Set-Top Box Power Supplies Power Supply post regulators. The parts are available

• Microprocessor Power Supplies in TO-220 and DDPAK/TO-263 packages.

• High Efficiency Linear Power Supplies Dropout Voltage: 210 mV (typ) @ 3A load current.

• SMPS Post-Regulators Ground Pin Current: 3 mA (typ) at full load.

Shutdown Current: 60 nA (typ) when S/D pin is low.

Precision Output Voltage: 1.5% room temperature

accuracy.

Typical Application Circuit

At least 4.7 µF of input and output capacitance is required for stability.

Connection Diagram

Figure 1. TO-220, Top View Figure 2. DDPAK/TO-263, Top View

See NDH0005D Package See KTT0005B Package

1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

LP3883

SNVS223F –NOVEMBER 2002–REVISED APRIL 2013

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Block Diagram

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

ABSOLUTE MAXIMUM RATINGS(1)(2)

Storage Temperature Range −65°C to +150°C

Lead Temp. (Soldering, 5 seconds) 260°C

ESD Rating Human Body Model(3) 2 kV

Machine Model(4) 200V

Power Dissipation(5) Internally Limited

VIN Supply Voltage (Survival) −0.3V to +6V

VBIAS Supply Voltage (Survival) −0.3V to +7V

Shutdown Input Voltage (Survival) −0.3V to +7V

IOUT (Survival) Internally Limited

Output Voltage (Survival) −0.3V to +6V

Junction Temperature −40°C to +150°C

(1) Absolute maximum ratings indicate limits beyond which damage to the component may occur. Operating ratings indicate conditions for

which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications, see Electrical

Characteristics. Specifications do not apply when operating the device outside of its rated operating conditions.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and

specifications.

(3) The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.

(4) The machine model is a 220 pF capacitor discharged directly into each pin. The machine model ESD rating of pin 5 is 100V.

(5) At elevated temperatures, device power dissipation must be derated based on package thermal resistance and heatsink thermal values.

θJ-A for TO-220 devices is 65°C/W if no heatsink is used. If the TO-220 device is attached to a heatsink, a θJ-S value of 4°C/W can be

assumed. θJ-A for DDPAK/TO-263 devices is approximately 40°C/W if soldered down to a copper plane which is at least 1.5 square

inches in area. If power dissipation causes the junction temperature to exceed specified limits, the device will go into thermal shutdown.

OPERATING RATINGS

VIN Supply Voltage (VOUT + VDO) to 5.5V

Shutdown Input Voltage 0 to +6V

IOUT 3A

Operating Junction Temperature Range −40°C to +125°C

VBIAS Supply Voltage 4.5V to 6V

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ELECTRICAL CHARACTERISTICS

Limits in standard typeface are for TJ= 25°C, and limits in boldface type apply over the full operating temperature range.

Unless otherwise specified: VIN = VO(NOM) + 1V, VBIAS = 4.5V, IL= 10 mA, CIN = COUT = 4.7 µF, VS/D = VBIAS.

Symbol Parameter Conditions Typical(1) MIN(2) MAX(2) Units

VOOutput Voltage Tolerance 10 mA < IL< 3A 1.198 1.234

VO(NOM) + 1V ≤VIN ≤5.5V 1.216

4.5V ≤VBIAS ≤6V 1.186 1.246

1.478 1.522

1.5 V

1.455 1.545

1.773 1.827

1.8 1.746 1.854

ΔVO/ΔVIN Output Voltage Line Regulation(3) VO(NOM) + 1V ≤VIN ≤5.5V 0.01 %/V

ΔVO/ΔILOutput Voltage Load Regulation(4) 10 mA < IL< 3A 0.04 %/A

0.06

VDO Dropout Voltage(5) IL= 3A 270

210 mV

420

IQ(VIN) Quiescent Current Drawn from VIN 10 mA < IL< 3A 7

3 mA

Supply 8

VS/D ≤0.3V 1

0.03 µA

IQ(VBIAS) Quiescent Current Drawn from 10 mA < IL< 3A 2

1 mA

VBIAS Supply 3

VS/D ≤0.3V 1

0.03 µA

ISC Short-Circuit Current VOUT = 0V 6 A

Shutdown Input

VSDT Output Turn-off Threshold Output = ON 0.7 1.3 V

Output = OFF 0.7 0.3

Td (OFF) Turn-OFF Delay RLOAD X COUT << Td (OFF) 20 µs

Td (ON) Turn-ON Delay RLOAD X COUT << Td (ON) 15

IS/D S/D Input Current VS/D =1.3V 1 µA

VS/D ≤0.3V −1

AC Parameters

PSRR (VIN) Ripple Rejection for VIN Input VIN = VOUT +1V, f = 120 Hz 80

Voltage VIN = VOUT + 1V, f = 1 kHz 65 dB

PSRR (VBIAS) Ripple Rejection for VBIAS Voltage VBIAS = VOUT + 3V, f = 120 Hz 70

VBIAS = VOUT + 3V, f = 1 kHz 65

Output Noise Density f = 120 Hz µV/root−H

enOutput Noise Voltage BW = 10 Hz −100 kHz 150 µV (rms)

VOUT = 1.8V BW = 300 Hz −300 kHz 90

(1) Typical numbers represent the most likely parametric norm for 25°C operation.

(2) Limits are ensured through testing, statistical correlation, or design.

(3) Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.

(4) Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load

to full load.

(5) Dropout voltage is defined as the minimum input to output differential required to maintain the output with 2% of nominal value.

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TYPICAL PERFORMANCE CHARACTERISTICS

Unless otherwise specified: TA= 25°C, COUT = 4.7µF, Cin = 4.7µF, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V.

Dropout IGND

vs vs

ILVSD

Figure 3. Figure 4.

VOUT

Temperature DC Load Regulation

Figure 5. Figure 6.

Line Regulation Line Regulation

vs vs

VIN VBIAS

Figure 7. Figure 8.

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TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Unless otherwise specified: TA= 25°C, COUT = 4.7µF, Cin = 4.7µF, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V.

IBIAS IBIAS

vs vs

ILVBIAS

Figure 9. Figure 10.

IGND

VSD Noise Measurement

Figure 11. Figure 12.

VOUTStartup Waveform VOUTStartup Waveform

Figure 13. Figure 14.

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TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Unless otherwise specified: TA= 25°C, COUT = 4.7µF, Cin = 4.7µF, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V.

Line Regulation

VOUTStartup Waveform VBIAS

Figure 15. Figure 16.

Line Regulation

VBIAS VIN PSRR

Figure 17. Figure 18.

VIN PSRR VBIAS PSRR

Figure 19. Figure 20.

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VOUT

100mV/DIV

ILOAD

3A/DIV

TIME (50Ps/DIV)

MAGNITUDE

VOUT

100mV/DIV

ILOAD

3A/DIV

TIME (50Ps/DIV)

MAGNITUDE

TIME (50Ps/DIV)

MAGNITUDE

VOUT

100mV/DIV

ILOAD

3A/DIV

TIME (50Ps/DIV)

MAGNITUDE

VOUT

100mV/DIV

ILOAD

3A/DIV

VOUT

100mV/DIV

ILOAD

3A/DIV

TIME (50Ps/DIV)

MAGNITUDE

VOUT

100mV/DIV

ILOAD

3A/DIV

TIME (50Ps/DIV)

MAGNITUDE

LP3883

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SNVS223F –NOVEMBER 2002–REVISED APRIL 2013

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Unless otherwise specified: TA= 25°C, COUT = 4.7µF, Cin = 4.7µF, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V.

Load Transient Response Load Transient Response

(Both Oscon 10µF/3A) (Both Oscon 100µF/3A)

Figure 21. Figure 22.

Load Transient Response Load Transient Response

(Both POSCAP 100µF/3A) (SANYO 150µF/3A)

Figure 23. Figure 24.

Load Transient Response Load Transient Response

(Tantalum 10µF/3A) (Tantalum 100µF/3A)

Figure 25. Figure 26.

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VOUT

100mV/DIV

ILOAD

1A/DIV

TIME (50Ps/DIV)

MAGNITUDE

VOUT

100mV/DIV

ILOAD

1A/DIV

TIME (50Ps/DIV)

MAGNITUDE

VOUT

100mV/DIV

ILOAD

1A/DIV

TIME (50Ps/DIV)

MAGNITUDE

VOUT

100mV/DIV

ILOAD

1A/DIV

TIME (50Ps/DIV)

MAGNITUDE

TIME (50Ps/DIV)

MAGNITUDE

VOUT

100mV/DIV

ILOAD

1A/DIV

VOUT

100mV/DIV

ILOAD

1A/DIV

TIME (50Ps/DIV)

MAGNITUDE

LP3883

SNVS223F –NOVEMBER 2002–REVISED APRIL 2013

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TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Unless otherwise specified: TA= 25°C, COUT = 4.7µF, Cin = 4.7µF, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V.

Load Transient Response Load Transient Response

(Both Oscon 10µF/1A) (Both Oscon 100µF/1A)

Figure 27. Figure 28.

Load Transient Response Load Transient Response

(Both POSCAP 100µF/1A) (SANYO 150µF/1A)

Figure 29. Figure 30.

Load Transient Response Load Transient Response

(Tantalum 10µF/1A) (Tantalum 100µF/1A)

Figure 31. Figure 32.

Product Folder Links: LP3883

LOAD CURRENT (A)

STABLE REGION COUT = 4.7PF

COUT = 100PF

0 1 2

COUT ESR (:)

.001

.01

0.1

1.0

LP3883

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SNVS223F –NOVEMBER 2002–REVISED APRIL 2013

APPLICATION HINTS

EXTERNAL CAPACITORS

To assure regulator stability, input and output capacitors are required as shown in the Typical Application Circuit.

OUTPUT CAPACITOR

At least 4.7µF of output capacitance is required for stability (the amount of capacitance can be increased without

limit). The output capacitor must be located less than 1 cm from the output pin of the IC and returned to a clean

analog ground. The ESR (equivalent series resistance) of the output capacitor must be within the "stable" range

as shown in the graph below over the full operating temperature range for stable operation.

Figure 33. Minimum ESR vs Output Load Current

Tantalum capacitors are recommended for the output as their ESR is ideally suited to the part's requirements

and the ESR is very stable over temperature. Aluminum electrolytics are not recommended because their ESR

increases very rapidly at temperatures below 10C. Aluminum caps can only be used in applications where lower

temperature operation is not required.

A second problem with Al caps is that many have ESR's which are only specified at low frequencies. The typical

loop bandwidth of a linear regulator is a few hundred kHz to several MHz. If an Al cap is used for the output cap,

it must be one whose ESR is specified at a frequency of 100 kHz or more.

Because the ESR of ceramic capacitors is only a few milli Ohms, they are not suitable for use as output

capacitors on LP388X devices. The regulator output can tolerate ceramic capacitance totaling up to 15% of the

amount of Tantalum capacitance connected from the output to ground.

OUTPUT "BYPASS" CAPACITORS

Many designers place small value "bypass" capacitors at various circuit points to reduce noise. Ceramic

capacitors in the value range of about 1000pF to 0.1µF placed directly on the output of a PNP or P-FET LDO

regulator can cause a loss of phase margin which can result in oscillations, even when a Tantalum output

capacitor is in parallel with it. This is not unique to Texas Instruments LDO regulators, it is true of any P-type

LDO regulator.

The reason for this is that PNP or P-FET regulators have a higher output impedance (compared to an NPN

regulator), which results in a pole-zero pair being formed by every different capacitor connected to the output.

The zero frequency is approximately:

Fz= 1 / (2 X πX ESR X C)

where

• ESR is the equivalent series resistance of the capacitor

• C is the value of capacitance (1)

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The pole frequency is:

Fp= 1 / (2 X πX RLX C)

where

• RLis the load resistance connected to the regulator output (2)

To understand why a small capacitor can reduce phase margin: assume a typical LDO with a bandwidth of

1MHz, which is delivering 0.5A of current from a 2.5V output (which means RLis 5 Ohms). We then place a .047

µF capacitor on the output. This creates a pole whose frequency is:

Fp= 1 / (2 X πX 5 X .047 X 10E-6) = 677 kHz (3)

This pole would add close to 60 degrees of phase lag at the crossover (unity gain) frequency of 1 MHz, which

would almost certainly make this regulator oscillate. Depending on the load current, output voltage, and

bandwidth, there are usually values of small capacitors which can seriously reduce phase margin. If the

capacitors are ceramic, they tend to oscillate more easily because they have very little internal inductance to

damp it out. If bypass capacitors are used, it is best to place them near the load and use trace inductance to

"decouple" them from the regulator output.

INPUT CAPACITOR

The input capacitor must be at least 4.7 µF, but can be increased without limit. It's purpose is to provide a low

source impedance for the regulator input. Ceramic capacitors work best for this, but Tantalums are also very

good. There is no ESR limitation on the input capacitor (the lower, the better). Aluminum electrolytics can be

used, but their ESR increase very quickly at cold temperatures. They are not recommended for any application

where temperatures go below about 10°C.

BIAS CAPACITOR

The 0.1µF capacitor on the bias line can be any good quality capacitor (ceramic is recommended).

BIAS VOLTAGE

The bias voltage is an external voltage rail required to get gate drive for the N-FET pass transistor. Bias voltage

must be in the range of 4.5 - 6V to assure proper operation of the part.

UNDER VOLTAGE LOCKOUT

The bias voltage is monitored by a circuit which prevents the regulator output from turning on if the bias voltage

is below approximately 4V.

SHUTDOWN OPERATION

Pulling down the shutdown (S/D) pin will turn-off the regulator. Pin S/D must be actively terminated through a

pull-up resistor (10 kΩto 100 kΩ) for a proper operation. If this pin is driven from a source that actively pulls high

and low (such as a CMOS rail to rail comparator), the pull-up resistor is not required. This pin must be tied to Vin

if not used.

POWER DISSIPATION/HEATSINKING

A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of

the application. Under all possible conditions, the junction temperature must be within the range specified under

operating conditions. The total power dissipation of the device is given by:

PD= (VIN−VOUT)IOUT+ (VIN)IGND

where

• IGND is the operating ground current of the device (4)

The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax) of the

application, and the maximum allowable junction temperature (TJmax):

TRmax = TJmax−TAmax (5)

The maximum allowable value for junction to ambient Thermal Resistance, θJA, can be calculated using the

formula:

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θJA = TRmax / PD(6)

These parts are available in TO-220 and DDPAK/TO-263 packages. The thermal resistance depends on amount

of copper area or heat sink, and on air flow. If the maximum allowable value of θJA calculated above is ≥60 °C/W

for TO-220 package and ≥60 °C/W for DDPAK/TO-263 package no heatsink is needed since the package can

dissipate enough heat to satisfy these requirements. If the value for allowable θJA falls below these limits, a heat

sink is required.

HEATSINKING TO-220 PACKAGE

The thermal resistance of a TO220 package can be reduced by attaching it to a heat sink or a copper plane on a

PC board. If a copper plane is to be used, the values of θJA will be same as shown in next section for TO263

package.

The heatsink to be used in the application should have a heatsink to ambient thermal resistance,

θHA≤ θJA − θCH − θJC. (7)

In this equation, θCH is the thermal resistance from the case to the surface of the heat sink and θJC is the thermal

resistance from the junction to the surface of the case. θJC is about 3°C/W for a TO220 package. The value for

θCH depends on method of attachment, insulator, etc. θCH varies between 1.5°C/W to 2.5°C/W. If the exact value

is unknown, 2°C/W can be assumed.

HEATSINKING DDPAK/TO-263 PACKAGE

The DDPAK/TO-263 package uses the copper plane on the PCB as a heatsink. The tab of these packages are

soldered to the copper plane for heat sinking. The graph below shows a curve for the θJA of DDPAK/TO-263

package for different copper area sizes, using a typical PCB with 1 ounce copper and no solder mask over the

copper area for heat sinking.

Figure 34. θJA vs Copper (1 Ounce) Area for DDPAK/TO-263 package

As shown in the graph below, increasing the copper area beyond 1 square inch produces very little improvement.

The minimum value for θJA for the DDPAK/TO-263 package mounted to a PCB is 32°C/W.

Figure 35 shows the maximum allowable power dissipation for DDPAK/TO-263 packages for different ambient

temperatures, assuming θJA is 35°C/W and the maximum junction temperature is 125°C.

Figure 35. Maximum power dissipation vs ambient temperature for DDPAK/TO-263 package

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REVISION HISTORY

Changes from Revision E (April 2013) to Revision F Page

• Changed layout of National Data Sheet to TI format .......................................................................................................... 11

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PACKAGE OPTION ADDENDUM

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Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead finish/

Ball material

(6)

MSL Peak Temp

(3)

Op Temp (°C) Device Marking

(4/5)

Samples

LP3883ES-1.2 NRND DDPAK/

TO-263 KTT 5 45 Non-RoHS &

Non-Green Call TI Call TI -40 to 125 LP3883ES

-1.2

LP3883ES-1.2/NOPB ACTIVE DDPAK/

TO-263 KTT 5 45 RoHS-Exempt

& Green SN Level-3-245C-168 HR -40 to 125 LP3883ES

-1.2

LP3883ES-1.5/NOPB ACTIVE DDPAK/

TO-263 KTT 5 45 RoHS-Exempt

& Green SN Level-3-245C-168 HR -40 to 125 LP3883ES

-1.5

LP3883ESX-1.2 NRND DDPAK/

TO-263 KTT 5 500 Non-RoHS &

Non-Green Call TI Call TI -40 to 125 LP3883ES

-1.2

LP3883ESX-1.2/NOPB ACTIVE DDPAK/

TO-263 KTT 5 500 RoHS-Exempt

& Green SN Level-3-245C-168 HR -40 to 125 LP3883ES

-1.2

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

(6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two

lines if the finish value exceeds the maximum column width.

PACKAGE OPTION ADDENDUM

www.ti.com 10-Dec-2020

Addendum-Page 2

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

LP3883ESX-1.2 DDPAK/

TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

LP3883ESX-1.2/NOPB DDPAK/

TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2

PACKAGE MATERIALS INFORMATION

www.ti.com 29-Sep-2019

Pack Materials-Page 1

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

LP3883ESX-1.2 DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0

LP3883ESX-1.2/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0

PACKAGE MATERIALS INFORMATION

www.ti.com 29-Sep-2019

Pack Materials-Page 2

MECHANICAL DATA

KTT0005B

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BOTTOM SIDE OF PACKAGE

TS5B (Rev D)

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