AS1375
1µA Quiescent Current, 200mA LDO
www.austriamicrosystems.com/LDOs/AS1375 Revision 1.02 1 - 10
Datasheet
1 General Description
The AS1375 low-power, positive voltage regulator is
designed to deliver up to 200mA, while cons uming only
1µA (typ.) of quiescent current. The device is available
in fixed output voltages between 1.2V and 5.0V
(programmable in 50mV steps). The input voltage
ranges from 2V to 5.5V. Operation with large input to
output differential voltages is limited by the maximum
power dissipation available from package and
environment.
The very-low dropout voltage prolongs battery life and
allows high current in small applicati ons when operated
with minimum input-to-output voltage differentials. The
device features very stable output voltage, strict output
voltage regulation tolerances (±1%), and excellent line-
and load-regulation.
The device features integrated short-circuit and over
current protection. Under-Voltage lockout prevents
erratic operation when the input voltage is slowly
decaying. Thermal Protection shuts down the device
when die temperature reaches 160°C. This is a useful
protection when the device is under sustained short
circuit conditions.
The AS1375 is available in an 6-pin TDFN 2x2mm
package and is qualified for -40°C to +85°C operation.
2 Key Features
! Input Voltage: 2V to 5.5V
! Low Dropout V oltage: 120mV @ 200mA load
! Output Vo ltage Range: 1.2V to 5.0V (50mV steps)
! Max. Output Current: 200mA
! Very Low Quiescent Current: 1µA
! Output Vo ltage Accuracy: ±1%
! Low Shutdown Current: 10nA (typ.)
! Integrated Overtemperature/Overcurrent Protection
! Under-Voltage Lockout Feature
! Enable Input
! Minimal External Components Required
! Operating Temperature Range: -40°C to +85°C
! 6-pin TDFN 2x2mm Package
3 Applications
The device is perfectly suited for wireless handsets,
smartphones, PDAs, MP3 players, and other battery-
operated handheld devices, where the regulators have
to be always on.
Figure 1. AS1375 - Typical Application Diagram
Input
2V to 5.5V
CIN
1µF
ON /
OFF
COUT
1µF
Output
1.2V to 5V
IN
EN GND
OUT
AS1375
www.austriamicrosystems.com/LDOs/AS1375 Revision 1.02 2 - 10
AS1375
Datasheet - Pin A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
Pin Descriptions
Table 1. Pin Descriptions
Pin Name Pin Number Description
IN 1Input Supply
EN 3Enable Input. A logic low disables the regulator. Connect to pin IN for
normal operation.
GND 2, 4, 5 Ground
OUT 6Regulate d Output Voltage. Current flowing out of this pin is equivalent DC
load current.
Exposed Pad 7Ground. This pin also functions as a heat sink. Solder to a large pad or the
circuit-board ground plane to maximize power dissipation.
3EN
2GND
1IN 6OUT
AS1375 5GND
4GND
7
www.austriamicrosystems.com/LDOs/AS1375 Revision 1.02 3 - 10
AS1375
Datasheet - Ab so lu te Ma xi mu m Ratin gs
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only,
and functional op eration of the device at these or any other conditions beyond those in dicated in Section 6 Electrical
Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter Min Max Units Notes
Input Voltage +7 V
Output Short-Circuit Duration Indefinite V
Electrostatic Discharge 2 kV HBM MIL-Std. 883E 3015.7 method s
Latch-Up 100 mA @85°C, JEDEC 78
Thermal Resistance θJA +140 ºC/W
Junction Temperature +150 ºC Internally limited
Operating Temperature Range -40 +85 ºC
Storage Temperature Range -65 +150 ºC
Package Body Temperature +260 ºC
The reflow peak soldering temperature
(body temperature) specified is in
accordance with IPC/JEDEC J-STD-
020D “Moisture/Reflow Sensitivity
Classification for Non-Hermetic So lid
State Surfa c e Mo un t D ev ice s”.
The lead finish for Pb-free leaded
packages is matte tin (100% Sn).
www.austriamicrosystems.com/LDOs/AS1375 Revision 1.02 4 - 10
AS1375
Datasheet - Ele c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VIN = VOUT + 500mV or VIN = +2V (whichever is greater),CIN = COUT = 1µF, EN = IN, TAMB = -40°C to +85ºC (unless
otherwise specified). Typical values are at TAMB = +25ºC.
Table 3. Electrical Characte ristics
Symbol Parameter Condition Min Typ Max Unit
VIN Input Voltage 2 5.5 V
Output Voltage Accuracy
IOUT = 10mA -1 +1 %
IOUT = 1 to 200mA, VOUT > 1.5V 1
1. Guaranteed by production test of load regu lation.
-1.5 +1.5 %
IOUT = 1 to 200mA, VOUT < 1.5V1-2 +2 %
VOUT Output Voltage Range 1.2 5.0 V
IOUT Guaranteed Output Current
(RMS) 200 mA
ILIMIT Short-Circuit Current Limit VOUT = 0 250 330 450 mA
In-Regulation Current Limit VOUT > 96% of nominal value 330 mA
IQGround-Pin Current
IOUT = 0 1.2 2
µAIOUT = 100µA 1
IOUT = 200mA 1.7
VIN -
VOUT Dropout Voltage2
2. Dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT measured for VIN =
(VOUT(NOM) + 500mV). Since the minimum input voltage is 2V, this specification is only valid when VOUT(NOM) >
2V.
IOUT = 200mA, VOUT 2.8V 120 200 mV
IOUT = 200mA, 2V < VOUT < 2.8V 170 350
ΔVLNR Line Regulation VIN from (VOUT + 500mV) to 5.5V,
ILOAD = 10mA -0.125 +0.125 %/V
ΔVLDR Load Regulation IOUT = 1mA to 200mA 0.003 %/mA
Shutdown
IOFF Shutdown Supply Current EN = GND 10 100 nA
VIH EN Input Threshold 2V < VIN < 5. 5V 1.2 V
VIL 2V < VIN < 5. 5V 0.4 V
IEN EN Input Bias Current EN = IN or GND 1 403
3. Guaranteed by design.
Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or
SQC (Statistical Quality Control) methods.
nA
Startup Time from EN to 90% of VOUT(NOM) 750 µs
Shutdown Time from EN to 10% of VOUT(NOM) 500
Thermal Protection
TSHDNN Thermal Shutdown
Temperature 160 ºC
ΔTSHDNN Thermal Shutdo w n Hyst ere si s 20 ºC
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AS1375
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
VIN = 3.5V, VOUT = 3.0V, TAMB = +25°C (unless otherwise specified).
Figure 3. Line Regulation Figure 4. Load Regulation
2.95
2.975
3
3.025
3.05
3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
I n put Volt ag e ( V)
Out put Voltage ( V )
Iou t = 0.1mA
Iou t = 10mA
Iou t 0 100mA
Iout = 200mA 2.95
2.975
3
3.025
3.05
0 25 50 75 100 125 150 175 200
Output Current (mA )
Out put Voltage ( V )
Figure 5. Ground Pin Current vs. Output Current Figure 6. Ground Pin Current vs. Input Voltage
1
1.25
1.5
1.75
2
2.25
2.5
0 25 50 75 100 125 150 175 200
Output Current (mA)
Ground Pi n Cur r ent A )
1
1.25
1.5
1.75
2
2.25
2.5
3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5
Input Volt age ( V)
Ground Pi n Cur r ent A )
Iou t = 0.1mA
Iou t = 100m A
Iout = 200mA
Figure 7. Output Voltage vs. Input Voltage - Dropout
2.9
2.92
2.94
2.96
2.98
3
3.02
3.04
3.06
2.9 3 3.1 3.2 3.3 3.4 3.5
Input Volt age ( V)
Out put Voltage ( V )
Iload = 100mA
Iload = 200mA
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AS1375
Datasheet - D et a i l e d De s c r i p t i o n
8 Detailed Description
The AS1375 is an low-power and low-quiescent current linear-regulator specifically designed for space-limited applica-
tions. These device can supply loads up to 200mA. As shown in Figure 8, the AS1375 consist of an integrated voltage
reference, error amplifier, P-channel MOSFET pass transistor.
Additional blocks include a current limiter, thermal sensor, and enable logic.
Internal Voltage Reference
The bandgap reference is connected to the error amplifier s inverting input. The error amplifier compares this reference
with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the
pass-transistor gate is pulled low. Th is allo ws more current to pass to the output and increases the output voltage. If
the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output.
Figure 8. AS1375 - Block Diagram
Current Limit
The AS1375 include a current limiting circui try to monitor and control the P-ch annel MOSFET pass transistor’s gate
voltage, thus limiting the device output current to 300mA.
Note: See Table 3 on page 4 for the min and max current limits. The output can be shorted to ground indefinitely
without causing damage to the device.
Thermal Protection
Integrated thermal protection circuitry limits total power dissipation in the AS1375. When the junction temperature (TJ)
exceeds +160ºC, the thermal sensor signals the shutdown logic, turning off the P-channel MOSFET pass transistor
and allowing the device to cool down. The thermal sensor turns the pass transistor on again after the device’ s junction
temperature drops by 20ºC, resulting in a pulsed output during continuous thermal-overload conditions.
Note: Thermal pr otection i s designed to protect th e devices in the event of fault conditions. For continuous operation,
do not exceed the absolute maximum junction temperature rating of +150ºC.
EN
GND
OUT
AS1375
-
+
Overcurrent
Protection
Voltage
and
Current Reference
Enable Con-
trol Logic
Thermal
Protection
IN
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AS1375
Datasheet - App l i c a t i o n I n f o r m a t i o n
9 Application Information
Capacitor Selection and Regulator Stability
For normal operation, use a 1µF capacitor at pin IN and a 1µF capacitor at pin OUT. Larger input capacitor values and
lower ESR provide better noise rejection and line-transient response. Reduce output noise and improve load-transient
response, stability, and power-supply rejection by using la rge output capacitors.
Note: Some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. Wi th dielectrics such
as Z5U and Y5V, it may be necessary to use a 2.2µF or larger output capacitor to ensure stability at tempera-
tures below -10°C. With X7R or X5R dielectrics, 1µF is sufficient at all operating temperatures.
Noise, PSRR, and Transient Response
The AS1375 is designed to deliver low dropout and low quiescent currents in battery-powered systems. The power-
supply rejection is 85dB at 1kHz and 50dB at 100kHz.
When operating from sources other than batteries, improved supp ly-noise rejection and transient response can be
achieved by increasing the values of the input and output capacitors, and through passive filtering techniques.
Dropout Voltage
The AS1375 minimum dropout voltage determines the lowest usable supply voltage. In battery-powered systems, this
determines the useful end-of-life battery voltage.
Since the AS1375 use a P-channel MOSFET pass transistor, the dropout voltage is a function of drain-to-source on-
resistance (RDS(ON)) multiplied by ILOAD.
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AS1375
Datasheet - Pa ck ag e D ra wings a nd Ma rk in gs
10 Package Drawings and Markings
The device is available in a 6-pin TDFN 2x2mm package.
Figure 9. 6-pin TDFN 2x2mm Package Diagram
Note:
1. All dimensions are in millimeters, angle is in degrees (°).
2. N is the total number of terminals.
3. The location of the terminal #1 identifier and terminal numbering convention conforms to JEDEC publication 95
SPP-002.
4. ND and NE refer to the number of terminals on ea ch D and E side respectively.
5. NJR refer to non jedec registered.
6. Dimension b applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal
tip. If the terminal has the optional radius on the other end of the terminal, the dimension B should not be mea-
sured in that radius area.
7. Coplanarity applies to the terminals and all other bottom surface metallization.
Table 4. 4-bumps WL-CSP package Dimensions
Symbol Min Typ Max Symbol Min Typ Max
A 0.51 0.55 0.60 D BSC 1.95 2.00 2.05
A1 0.00 0.02 0.05 E BSC 1.95 2.00 2.05
A3 0.15 REF D2 1.30 1.45 1.55
b0.20 0.25 0.32 E2 0.85 1.00 1.10
e0.50 L 0.15 0.25 0.35
aaa 0.15 k 0.20
bbb 0.10 ND 3
ccc 0.10 N 6
D/2
D
E
E/2
B
aaa C
aaa C
A
INDEX AREA
D/2 x E/2
TOP VIEW
A3
SEATING
PLANE
A
SIDE V IEW
D2
L
b
bbb C A B
INDEX AREA
(D/2 x E /2)
BOTTOM VIEW
eTerminal Tip
EXPOSED PAD
B
A1
0.08 C
ccc C
PIN#1 ID
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AS1375
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The devices are available as the standard products shown in Table 5.
Non-standard devices from 1.2V to 5.0V are available in 50mV steps. For more informati on and inquiries contact
http://www.austriamicrosystems.com/contact
Note: All products are RoHS compliant.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
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For further information and requests, please contact us mailto:sales@austriamicrosystems.com
or find your local distributor at http://www.austriamicrosystems.com/distributor
Table 5. Ordering Information
Ordering Code Marking Output Description Delivery Form Package
AS1375-BTDT-12 ABD 1.2V 1µA Quiescent Current,
200mA LDO Tape and Reel 6-pin TDFN 2x2mm
AS1375-BTDT-18 ABE 1.8V 1µA Quiescent Current,
200mA LDO Tape and Reel 6-pin TDFN 2x2mm
AS1375-BTDT-25 ABF 2.5V 1µA Quiescent Current,
200mA LDO Tape and Reel 6-pin TDFN 2x2mm
AS1375-BTDT-30 ABG 3.0V 1µA Quiescent Current,
200mA LDO Tape and Reel 6-pin TDFN 2x2mm
AS1375-BTDT-33 ABH 3.3V 1µA Quiescent Current,
200mA LDO Tape and Reel 6-pin TDFN 2x2mm
www.austriamicrosystems.com/LDOs/AS1375 Revision 1.02 10 - 10
AS1375
Datasheet
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