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ams AG
The technical content of this austriamicrosystems datasheet is still valid.
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AS1353, AS1356
L i n e a r L o w - D r o p o u t 1 5 0 m A Vo l ta g e R e g u l a t o r s
2 Key Features
The integrated P-channel MOSFET output allows the
devices to maintain a low supply-current at loads of up
to150mA. A shutdown mode includes logic-controlled
circuitry which reduces shutdown current to less than
1µA (max).
Ultra-Low Dropout Voltage: 40mV @ 100mA load
!
Output Voltage Range: +1.5 to +3.6V (100mV steps)
!
Max Output Current: 150mA
!
Output Voltage Accuracy: ±1%
!
Low Shutdown Current: 1µA
!
High PSRR: 60dB at 100Hz
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Integrated over-temperature and over-current protection circuitry switches the devices off in case of thermal
overload or output short-circuit conditions.
!
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The AS1353/AS1356 are high-performance, fixed-voltage linear LDOs designed for use with capacitors of 1 to
10µF. The devices can deliver superior performance
even under low dropout conditions when the power transistor operates in linear mode.
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1 General Description
Data Sheet
The AS1353/AS1356 are optimized for low equivalentseries resistance (ESR) output capacitors. Additionally,
all devices contain reversed battery protection which disconnects the internal circuitry and parasitic diodes if the
battery is connected incorrectly.
The AS1356 also features power-OK circuitry which can
be used to monitor output regulation.
All devices also feature an integrated error amplifier and
built-in 1.25V reference, and output current is limited
(380mA typ) via the on-chip current limiting circuitry.
Multiple output voltages are available as standard products: 3.6, 3.3, 3.0, 2.7, 2.5, or 1.5V. All devices are available in a 5-pin SOT23 package.
!
Integrated Overtemperature/Overcurrent Protection
!
Reverse-Battery Protection (AS1353/AS1356)
!
Power-OK Output (AS1356)
!
Minimal External Components Required
!
Operating Temperature Range: -40 to +85°C
!
5-pin SOT23 Package
3 Applications
The devices are ideal for powering cordless and mobile
phones, MP3 players, CD and DVD players, PDAs,
handheld computers, digital cameras, and any other
hand-held and/or battery-powered device.
IN 1
5 OUT
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IN 1
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Figure 1. Pinout and Application Diagrams
GND 2
3
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SHDNM
AS1353
IN
CIN
1µF
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+2.5 to
+5.5V
On
Off
4 BP
OUT
AS1353
SHDNM
BP
GND 2
SHDNM
Preset Output
1.5 to 3.6V,
150mA
COUT
1µF
+2.5 to
+5.5V
Off
CBP
0.01µF
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AS1356
3
4 POK
IN
OUT
CIN
1µF
COUT
1µF
Preset Output
1.5 to 3.6V,
150mA
AS1356
On
GND
5 OUT
Revision 1.03
100kΩ
SHDNM
GND
POK
To Microprocessor
1 - 13
AS1353/AS1356
Data Sheet - P i n o u t
4 Pinout
Pin Assignments
GND 2
Pin Descriptions
AS1353
GND 2
3
4 BP
SHDNM
5 OUT
AS1356
3
4 POK
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SHDNM
IN 1
5 OUT
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IN 1
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Figure 2. Pin Assignments (Top View)
Table 1. AS1353 Pin Descriptions
Pin Number
1
2
Pin Name
Description
IN
LDO Input. Supply voltage can range from 2.5 to 5.5V. Bypass with a 1µF
capacitor to GND (see Capacitor Selection and Regulator Stability on page 10).
GND
3
SHDNM
4
BP
5
OUT
Ground. This pin also functions as a heat sink. Solder to a large pad or the
circuit-board ground plane to maximize power dissipation.
Active-Low Shutdown Input. A logic low reduces the supply current to < 1µA.
Note: Connect to IN for normal operation.
Reference-Noise Bypass. Bypass with a low-leakage, 0.01µF ceramic
capacitor for reduced noise at the output.
LDO Output. Fixed 1.5, 2.5, 2.7, 3.0, 3.3, and 3.6V output. Sources up to
150mA.
Table 2. AS1356 Pin Descriptions
IN
GND
SHDNM
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3
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4
5
Description
LDO Input. Input voltage can range from 2.5 to 5.5V. Bypass with 1µF to GND
(see Capacitor Selection and Regulator Stability on page 10).
Ground. This pin also functions as a heat sink. Solder to a large pad or the
circuit-board ground plane to maximize power dissipation.
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1
2
Pin Name
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Pin Number
Active-Low Shutdown Input. A logic low reduces the supply current to < 1µA.
Note: Connect to pin IN for normal operation.
POK
Power-OK Output. Active-low, open-drain output indicates an out-of-regulation
condition. Connect a 100kΩ pull-up resistor to pin OUT for logic levels.
Note: Leave this pin unconnected if the power-OK feature is not used.
OUT
LDO Output. Fixed 1.5, 2.5, 2.7, 3.0, 3.3, and 3.6V output. Sources up to
150mA.
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Revision 1.03
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AS1353/AS1356
Data Sheet - A b s o l u t e
Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated 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 3. Absolute Maximum Ratings
Max
-7
+7
V
SHDNM to IN
-7
+0.3
V
POK, BP, OUT to GND
-0.3
VIN +
+0.3
V
Output Short-Circuit Duration
Indefinite
Continuous Power Dissipation
(TAMB = +70ºC)
V
571
-40
Units
mW
+85
ºC
Junction Temperature
+150
ºC
ΘJA
+140
ºC/W
+150
ºC
Comments
Derate 7.1mW/ºC above +70ºC
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Operating Temperature Range
Typ
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Min
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Parameter
IN, SHDNM to GND
Storage Temperature Range
-65
+260
ºC
The reflow peak soldering temperature
(body temperature) specified is in
accordance with IPC/JEDEC J-STD-020C
“Moisture/Reflow Sensitivity Classification
for non-hermetic Solid State Surface
Mount Devices”
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Package Body Temperature
Internally limited
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Revision 1.03
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AS1353/AS1356
Data Sheet - E l e c t r i c a l
Characteristics
6 Electrical Characteristics
(VIN = VOUT(Nominal) + 1V, SHDNM = IN, TAMB = -40 to +85ºC (unless otherwise specified). Typical values are at TAMB =
+25ºC. Limits are 100% production tested at TAMB = +25ºC.
Table 4. Electrical Characteristics
Conditions
Output Voltage Accuracy
IOUT
ILIM
Maximum Output Current
Current Limit
IQ
Ground Pin Current
VIN -VOUT
1
ΔVLNR
Line Regulation
ΔVLDR
Load Regulation
en
Output Voltage Noise
PSRR
Shutdown
IOUT = 100µA
IOUT = 150mA
IOUT = 100µA
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
VIN = 2.5V or (VOUT + 0.1) to 4.5V,
IOUT = 1mA
VIN = 2.5V or (VOUT + 0.1) to 5.5V,
IOUT = 1mA
IOUT = 100µA to 150mA, COUT = 1µF
COUT = 1µF,
f = 10Hz to 100kHz,
AS1353
CBP = 0.01µF
COUT = 1µF,
AS1356
f = 10Hz to 100kHz
Typ
Max
5.5
1
3
380
70
115
0.05
20
40
60
Output Voltage AC
Power-Supply Rejection
Ratio
2
180
100
CBP = 0.01µF, no load
(AS1353)
IOFF
Shutdown Supply
Current
SHDNM = GND
VIH
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SHDNM Input Threshold
ISHDNM
SHDNM Input Bias
Current
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Exit Delay from
34
Shutdown ,
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-0.2
0
0.2
-0.8
0
0.8
SHDNM = IN or GND
µA
mV
%/V
30
µVRMS
110
60
TAMB = +25ºC
TAMB = +85ºC
VIN = 2.5 to 5.5V
%
0.001 0.02 %/mA
f = 100Hz, COUT = 1µF,
(CBP = 0.01µF, AS1353)
tON
Unit
V
mA
mA
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Dropout Voltage
TAMB = +25ºC, IOUT = 100µA
TAMB = -40 to +85ºC, IOUT = 100µA to 150mA
Min
2.5
-1
-3
150
160
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Parameter
Input Voltage
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Symbol
VIN
30
150
0.01
0.04
1
2.0
TAMB = +25ºC
TAMB = +85ºC
0.03
0.2
0.4
100
dB
µs
µA
V
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Power-OK Output (AS1356 only)
Power-OK Voltage
Threshold
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VPOK
VOL
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POK Output Voltage Low
POK Output Leakage
Current
Thermal Protection
TSHDNM
Thermal Shutdown
Temperature
ΔTSHDNM
Thermal Shutdown
Hysteresis
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IOUT = 0, VOUTFALLING
Hysteresis, IOUT = 0
ISINK = 1mA
92
95
1
0 ≤ VPOK ≤ 5.5V, VOUT in regulation
AS1353
AS1356
AS1353
AS1356
Revision 1.03
150
165
15
20
97
%
VOUT
0.4
V
1
µA
ºC
ºC
ºC
4 - 13
AS1353/AS1356
Data Sheet - E l e c t r i c a l
Characteristics
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1. Dropout voltage = VIN - VOUT when VOUT is 100mV < VOUT for VIN = VOUT +0.5V (applies only to output voltages
≥ 2.5V).
2. The rise and fall time of the shutdown signal must not exceed 1ms.
3. The delay time is defined as time required to set VOUT to 95% of its final value.
4. Guaranteed by design.
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Revision 1.03
5 - 13
AS1353/AS1356
Data Sheet - Ty p i c a l
Operating Characteristics
7 Typical Operating Characteristics
VOUT = +3.0V, VIN = +3.6V, CIN = COUT = 1µF, SHDNM = IN, TAMB = +25ºC (unless otherwise specified)
Figure 3. Ground Pin Current vs. Input Voltage
Figure 4. Ground Pin Current vs. Output Load
120
.
100
IOUT = 0mA
80
60
40
20
0
110
VIN = 5V
100
VIN = 3.5V
90
80
70
60
0
1
2
3
4
5
0
6
25
Input Voltage (V)
75
100
125
150
Figure 6. Output Voltage vs. Input Voltage
3.5
130
VIN = 5V, IOUT = 150mA
120
110
VIN = 3.6V, IOUT = 150mA
100
90
80
IOUT = 150mA
3
Output Voltage (V) .
.
50
Output Load (mA)
Figure 5. Ground Pin Current vs. Temperature
Ground Pin Current (µA)
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Ground Pin Current (µA)
IOUT = 150mA
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120
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Ground Pin Current (µA)
.
140
VIN = 3.6V, IOUT = 0mA
IOUT = 0mA
2.5
2
1.5
1
0.5
70
VIN = 5V, IOUT = 0mA
60
-40
0
-20
0
20
40
60
80
0
100
1
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Figure 7. Output Voltage vs. Output Load
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3
VIN = 3.6V
2.95
4
5
6
3.04
3.03
VIN = 5V
3
Figure 8. Output Voltage vs. Temperature
Output Voltage (V) .
3.05
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Output Voltage (V) .
3.1
2
Input Voltage (V)
Temperature (°C)
VIN = 3.6V, IOUT = 0mA
3.02
3.01
VIN = 5V, IOUT = 150mA
3
VIN = 3.6V,
IOUT = 150mA
2.99
VIN = 3.6V, IOUT = 0mA
2.9
0
25
50
75
100
125
150
2.98
-40
Output Load (mA)
www.austriamicrosystems.com
-20
0
20
40
60
80
100
Temperature (°C)
Revision 1.03
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AS1353/AS1356
Data Sheet - Ty p i c a l
Operating Characteristics
Figure 9. Dropout Voltage vs. Output Load
Figure 10. PSRR vs. Frequency
80
70
125
60
100
75
+85°C
+25°C
50
50
40
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PSRR (dB) .
30
20
-45°C
25
10
0
0
0
25
50
75
100
125
150
10
100
1000
10000
100000
Frequency (Hz)
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Output Load (mA)
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Dropout Voltage (V) .
150
VOUT
20mV/Div
VIN
4V 5V
Figure 11. Line Transient Response; IOUT = 50mA
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10ms/Div
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Revision 1.03
7 - 13
AS1353/AS1356
Data Sheet - D e t a i l e d
Description
8 Detailed Description
The AS1353/AS1356 are low-dropout, low-quiescent-current linear regulators intended for LDO regulator applications
where output current load requirements range from no load to 150mA. All devices come standard with fixed output voltages of 1.5 to 3.6V (see Ordering Information on page 12).
AS1353/AS1356
ReverseBattery
Protection
SHDNM
Thermal
Overload
Protection
Shutdown/
Power-On
Control Logic
AS1356 only
Error
Amplifier
+
OUT
R2
BP
1
Trimmable
Reference
Voltage
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Bandgap Voltage
&
Current Reference
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IN
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Figure 12. Block Diagram
R1
POK
2
–
95%
GND
+
1
2
AS1353 only
AS1356 only
As illustrated in Figure 12, the devices comprise a 1.25V reference, error amplifier, P-channel MOSFET pass transistor, power-OK comparator, internal feedback voltage divider, current limiter, reverse-battery protection, thermal sensor
and shutdown logic.
The 1.25V bandgap reference is connected to the inverting input of the error amplifier. 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 P-channel MOSFET gate is pulled lower, allowing 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 up, allowing less current to
pass to the output. The output voltage feeds back through an internal resistor voltage divider connected to pin OUT.
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Output Voltages
Standard products are factory-set with output voltages of from 1.5 to 3.6V. A two-digit suffix of the part number identifies the nominal output voltage (see Ordering Information on page 12).
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Non-standard devices are available. Contact austriamicrosystems AG for more information.
Internal P-Channel MOSFET Pass Transistor
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The integrated 0.5Ω (typ) P-channel MOSFET pass transistor requires no base drive, which reduces quiescent current
significantly, and does not exhibit the problems associated with PNP-based regulators, such as dropout when the pass
transistor saturates or high base-drive currents under large load conditions.
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The devices consume only 115µA quiescent current in dropout, light-load, or heavy-load applications (see Typical
Operating Characteristics on page 6).
Power-OK
The AS1356’s power-ok circuitry is built around an N-channel MOSFET. The circuitry monitors the voltage on pin 5
(OUT) and if the voltage goes out of regulation (e.g. during dropout, current limit, or thermal shutdown) pin POK goes
low.
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Revision 1.03
8 - 13
AS1353/AS1356
Data Sheet - D e t a i l e d
Description
The power-OK feature is not active during shutdown and provides a power-on-reset (POR) function that can operate
down to VIN = 1V. A capacitor to GND may be added to generate a POR delay.
To obtain a logic-level output, connect a pull-up resistor from pin POK to pin OUT. Larger values for this resistor will
help minimize current consumption; a 100kΩ resistor is perfect for most applications (see Figure 13).
Reverse-Battery Protection
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The AS1353/AS1356 contain integrated reverse-battery protection circuitry which monitors the polarity of pins IN and
SHDNM and disconnects the internal circuitry and parasitic diodes if the battery is connected incorrectly. Reverse supply current is limited to 1mA if VIN = VSHDNM falls below ground. Load current is also limited when VIN or VSHDNM are
reverse biased with respect to ground.
Current Limiting
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Noise Reduction
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The AS1353/AS1356 include current limiting circuitry to protect against short-circuit conditions. The circuitry monitors
and controls the gate voltage of the P-channel MOSFET, limiting the output current to 380mA (typ). The P-channel
MOSFET output can be shorted to ground for an indefinite period of time without damaging the device.
The AS1353 uses an external 0.01µF bypass capacitor (CBP) at pin BP to reduce output noise. An internal pre-charge
circuit is used to reduce start-up time.
The use of CBP > 0.01µF improves noise performances but increases start-up time.
Thermal-Overload Protection
The devices are protected against thermal runaway conditions by the integrated thermal sensor circuitry. Thermal
shutdown is an effective means to prevent die overheating since the power transistor is the principle heat source in the
device.
If the junction temperature exceeds 165ºC (typ, AS1356) or 150ºC (typ, AS1353), the thermal sensor starts the shutdown logic, at which point the P-channel MOSFET is switched off. After the device temperature has dropped by
approximately 20ºC, the thermal sensor will turn the P-channel MOSFET on again. Note that this will be exhibited as a
pulsed output under continuous thermal-overload conditions.
Note: The absolute maximum junction-temperature rating of +150ºC should not be exceeding during continual operation.
Operating Region and Power Dissipation
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Maximum power dissipation is determined by the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipation of the device is calculated by:
P = IOUT (VIN - VOUT)
(EQ 1)
PMAX = (TJ - TAMB) / (ΘJB + ΘJA)
(EQ 2)
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Maximum power dissipation is calculated by:
Where:
TJ - TAMB is the temperature difference between the device die junction and the surrounding air.
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ΘJB or ΘJC is the thermal resistance of the package.
ΘJA is the thermal resistance through the printed circuit board, copper traces, and other materials to the surrounding
air.
Note: Pin GND is a multi-function pin providing a connection to the system ground and acting as a heat sink. This pin
should be connected to the system ground using a large pad or ground plane.
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Revision 1.03
9 - 13
AS1353/AS1356
Data Sheet - Ty p i c a l
Application
9 Typical Application
Figure 13. Typical Application Diagrams
CIN
1µF
Preset Output
1.5 to 3.6V,
150mA
OUT
IN
COUT
1µF
AS1353
Off
BP
IN
OUT
CIN
1µF
COUT
1µF
AS1356
SHDNM
On
+2.5 to
+5.5V
On
Off
GND
GND
POK
To Microprocessor
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CBP
0.01µF
100kΩ
SHDNM
Preset Output
1.5 to 3.6V,
150mA
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+2.5 to
+5.5V
Capacitor Selection and Regulator Stability
Ceramic capacitors are highly recommended as they offer distinct advantages over their tantalum and aluminum electrolytic components.
For stable operation with load currents up to 150mA over the entire device temperature range, use a 1µF (min)
ceramic output capacitor with an ESR <0.2Ω.
Use large output capacitor values (10µF max) to reduce noise and improve load transient-response, stability and
power-supply rejection.
Note: Some ceramic capacitors exhibit large capacitance and ESR variations with variations in temperature. Z5U
and Y5V capacitors may be required to ensure stability at temperatures below TAMB = -10ºC. With X7R or X5R
capacitors, a 1µF capacitor should be sufficient at all operating temperatures.
Power Supply Rejection Ratio
The AS1353/AS1356 are designed to deliver low dropout voltages and low quiescent currents. Power-supply rejection
is 60dB (typ) at low frequencies. To improve power supply-noise rejection and transient response, increase the values
of the input and output bypass capacitors (see Figure 13).
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The Typical Operating Characteristics (page 6) show the device line- and load-transient responses. See the PowerSupply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics section (page 6) for further
details.
Dropout Voltage
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For standard products with output voltage greater than the minimum VIN (2.5V), the minimum input-output voltage differential (dropout voltage) determines the lowest usable supply voltage. This determines the useful end-of-life battery
voltage in battery-powered systems.
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The dropout voltage is a function of the P-MOSFET drain-to-source on-resistance multiplied by the load current, and is
calculated by:
VDROPOUT = VIN - VOUT = RDS(ON) x IOUT
(EQ 3)
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Where:
RDS(ON) is the drain-to-source on-resistance.
IOUT is the supply current.
See Typical Operating Characteristics (page 6) for further information.
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Revision 1.03
10 - 13
AS1353/AS1356
Data Sheet - P a c k a g e
Drawings and Markings
10 Package Drawings and Markings
The AS1353/AS1356 are available in a 5-pin SOT23 package.
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Figure 14. 5-pin SOT23 Package
Notes:
Min
Max
0.90
1.45
0.00
0.15
0.90
1.30
0.30
0.50
0.09
0.20
2.80
3.05
2.60
3.00
1.50
1.75
0.30
0.55
0.95 REF
1.90 REF
0º
8º
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1. All dimensions in millimeters.
2. Foot length measured at intercept point between datum A and lead
surface.
3. Package outline exclusive of mold flash and metal burr.
4. Package outline inclusive of solder plating.
5. Complies with EIAJ SC74.
6. PKG ST 0003 Rev A supersedes SOT23-D-2005 Rev C.
Symbol
A
A1
A2
b
C
D
E
E1
L
e
e1
α
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Revision 1.03
11 - 13
AS1353/AS1356
Data Sheet - O r d e r i n g
Information
11 Ordering Information
The devices are available as the following standard products.
Marking
Description
Delivery Form
Package
AS1353-15-T
ASD8
LDO 150mA, Reverse-Battery Protection, 1.5V
Tape and Reel
5-pin SOT23
AS1353-18-T
ASD9
LDO 150mA, Reverse-Battery Protection, 1.8V
Tape and Reel
5-pin SOT23
AS1353-26-T
ASHB
LDO 150mA, Reverse-Battery Protection, 2.6V
Tape and Reel
5-pin SOT23
AS1353-28-T
ASHC
LDO 150mA, Reverse-Battery Protection, 2.8V
Tape and Reel
AS1353-30-T
ASHD
LDO 150mA, Reverse-Battery Protection, 3.0V
Tape and Reel
AS1353-33-T
ASHE
LDO 150mA, Reverse-Battery Protection, 3.3V
Tape and Reel
AS1353-36-T
ASI8
LDO 150mA, Reverse-Battery Protection, 3.6V
Tape and Reel
AS1356-27-T
ASHM
LDO 150mA, Reverse-Battery Protection,with
Power-OK, 2.7V
Tape and Reel
5-pin SOT23
AS1356-33-T
ASHO
LDO 150mA, Reverse-Battery Protection,with
Power-OK, 3.3V
Tape and Reel
5-pin SOT23
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Type
5-pin SOT23
5-pin SOT23
5-pin SOT23
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5-pin SOT23
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Non-standard versions are available with a minimum order of 30,000 units. Contact austriamicrosystems for availability
of non-standard versions.
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Revision 1.03
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AS1353/AS1356
Data Sheet
Copyrights
Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
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Disclaimer
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Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.
This product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
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The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
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Contact Information
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Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
www.austriamicrosystems.com
Revision 1.03
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