ams AS1363-BSTT-33 500ma, low-dropout linear voltage regulator Datasheet

AS1363
D a ta s h e e t
5 0 0 m A , L o w - D r o p o u t L i ne a r Vo l ta g e R e g u l a t o r
1 General Description
2 Key Features
The AS1363 is a low-dropout linear regulator that operates from a +2.0V to +5.5V supply and delivers a guaranteed 500mA load current with low 150mV dropout.
!
Guaranteed Output Current: 500mA
!
Low Dropout: 150mV @ 500mA
The device is available in two versions (see Table 1).
One version has a high-accuracy output with a preset
voltage (1.2, 1.5, 1.8, 3.0, 3.3, or 4.5V). This voltage is
internally trimmed and also offers a Bypass pin. With a
capacitor connected to this Bypass pin, the PSRR and
the Noise performance is improved.
!
2.0V to 5.5V Input Voltage
!
Fixed Output Voltage: 1.2V to 5.0V
!
User-Adjustable Output Voltage: 1.2V to 5.3V
!
Power OK Output
!
Low Quiescent Current: 40µA
!
Low Shutdown Current: 30nA
!
Thermal Overload Protection
!
Output Current Limit
!
6-pin SOT23 Package
At the other version the output voltage is user-adjustable
(1.2V to 5.3V) and offers an SET pin for setting the output voltage.
Table 1. Standard Products
Model
Output Type
BYP
SET
AS1363-AD
Adjustable
No
Yes
AS1363-_ _
Fixed
Yes
No
A low supply current (65µA typ.) at maximum load is
making the device ideal for portable battery-operated
equipment.
Other features are included such as an active-low opendrain reset output that indicates when the output is out
of regulation, a low-current (30nA typ.) shutdown mode,
an integrated short-circuit and a thermal shutdown protection.
3 Applications
The device is ideal for laptops, PDAs, portable audio
devices, mobile phones, cordless phones, and any other
battery-operated portable device.
The AS1363 is available in a 6-pin SOT23 package.
Figure 1. Typical Application Circuit
6
1
VIN
2.0V to 5.5V
VOUT
1.2V to 5.3V
OUT
IN
COUT
2.2µF
CIN
1µF
R1
On
Off
3
AS1363-AD
5
SET
EN
R2
2
To Controller
4
POK
GND
RPOK
100kΩ
VOUT Logic
Supply Voltage
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AS1363
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
IN 1
POK 2
EN 3
6 OUT
AS1363
5 SET/BYP
4 GND
Pin Descriptions
Table 2. Pin Descriptions
Pin Number
Pin Name
1
IN
2
POK
3
EN
4
GND
SET
5
BYP
6
OUT
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Description
+2.0V to +5.5V Supply Voltage. Bypass this pin with a 1µF capacitor to GND (see
Capacitor Selection and Regulator Stability on page 11).
Open-Drain POK Output. POK remains low while VOUT is below the POK
threshold. Connect a 100kΩ pull-up resistor from this pin to OUT to obtain an output
voltage (see Figure 1 on page 1).
Active-High Enable Input. A logic low reduces supply current below 30nA. In
shutdown mode, the POK output is low, and OUT is high impedance. Connect this
pin to IN for normal operation.
Ground
Voltage-Setting Input. Connect to GND for preset output or Connect to a resistive
voltage-divider between OUT and GND to set the output voltage between 1.2V and
5.3V (see Figure 1 on page 1).
Bypass Pin. Connect a 10nF capacitor from this pin to VOUT to improve PSRR and
noise performance (see Figure 16 on page 9).
Output. Sources up to 500mA. Bypass this pin with a 2.2µF low-ESR capacitor to
GND (see Figure 1 on page 1).
Note: For output voltages below 2V a 4.7µF capacitor should be used.
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AS1363
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
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 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
Parameter
Min
Max
Units
IN, POK, EN, SET/BYP to GND
-0.3
+6
V
OUT to GND
-0.3
VIN +0.3
V
Output Short-Circuit Duration
1
min
Continuous Power Dissipation
800
mW
Operating Temperature Range
-40
+85
ºC
Storage Temperature Range
-65
+150
ºC
+150
ºC
Junction Temperature
Package Body Temperature
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+260
ºC
Revision 1.03
Comments
TAMB = +70ºC; derate 10mW/ºC above +70ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020D “Moisture/Reflow
Sensitivity Classification for Non-Hermetic Solid
State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
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AS1363
Datasheet - E l e 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(NOM) + 500mV or VIN = +2.0V (whichever is greater), CIN = 1µF, COUT = 2.2µF, EN = IN, TAMB = -40 to
+85ºC (unless otherwise specified). Typical values are at TAMB = +25ºC.
Table 4. Electrical Characteristics
Symbol
Parameter
VIN
Input Voltage
VPOR
Power On reset
Condition
Min
Typ
2.0
Output Voltage Accuracy
(Preset Mode)
V
+0.75
IOUT = 100mA
-1.5
+1.5
-2
+2
1.2
5.3
V
1.23
V
VSET/BYP
SET/BYP Voltage Threshold
(Adjustable Mode)
IOUT
Guaranteed Output Current
(RMS)
ILIMIT
Short-Circuit Current Limit
VOUT = 0V
In-Regulation Current Limit
VOUT > 96% of nominal value
VIN = 2.5V, IOUT = 100mA,
VOUT set to 2.0V
1.17
1.20
500
SET/BYP Threshold
Quiescent Current
1.96
-0.75
Adjustable Output Voltage
Range
IQ
V
IOUT = 100mA, TAMB = +25ºC,
VOUT
SET/BYP Input Bias Current
5.5
1.78
IOUT = 1 to 500mA, VIN > (VOUT + 0.5V)
ISET
Unit
Falling, 100mV hysteresis
1
1.87
Max
0.55
VSET/BYP = 1.2V
mA
0.8
1.2
0.8
50
%
100
-100
A
A
150
mV
+100
nA
IOUT = 100µA
40
150
IOUT = 500mA
65
200
150
320
mV
%/V
µA
VIN VOUT
Dropout Voltage
ΔVLNR
Line Regulation
VIN from (VOUT + 100mV) to 5.5V,
ILOAD = 5mA
-0.125
+0.125
ΔVLDR
Load Regulation
IOUT = 1 to 500mA
-0.001
+0.001 %/mA
PSRR
2
Ripple Rejection
Output Voltage Noise
IOUT = 500mA
VOUT = 2.5V
f = 1kHz, IOUT = 10mA, adjustable Output
65
f = 10kHz, IOUT = 10mA, adjustable
Output
70
f = 100kHz, IOUT = 10mA, adjustable
Output
60
10Hz to 100kHz, IOUT = 10mA, adjustable
Output
80
100Hz to 100kHz, IOUT = 10mA,
adjustable Output
65
EN = GND, VIN = 5.5V, TAMB = 25°C
0.03
dB
µVRMS
Shutdown
IOFF
Shutdown Supply Current
VIH
VIL
IEN
EN Input Threshold
EN Input Bias Current
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EN = GND, VIN = 5.5V
2.0V < VIN < 5.5V
15
1.6
µA
V
2.0V < VIN < 5.5V
0.6
EN = IN or GND, TAMB = +25ºC
1
TAMB = +85ºC
5
Revision 1.03
0.5
V
nA
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AS1363
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 4. Electrical Characteristics (Continued)
Symbol
Parameter
Condition
Min
Typ
Max
Unit
POK Output Low Voltage
POK sinking 1mA
0.05
0.25
V
Operating Voltage Range for
Valid POK Signal
POK sinking 100µA
5.5
V
POK Output High leakage
Current
POK = 5.5V, TAMB = +25ºC
1
TAMB = +85ºC
5
POK Threshold
Rising edge (referenced to VOUT(NOM))
POK Output
VOL
1.1
90
94
nA
98
%
Thermal Protection
TSHDNN
Thermal Shutdown
Temperature
ΔTSHDNN Thermal Shutdown Hysteresis
170
ºC
20
ºC
1. Guaranteed by production test of load regulation and line regulation.
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 2.0V, this specification is only valid when VOUT(NOM)
> 2.0V.
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AS1363
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 = VOUT(NOM) + 0.5V, CIN = 1µF, COUT = 2.2µF, TAMB = 25°C (unless otherwise specified).
Figure 3. VDROP vs. IOUT;
Figure 4. VOUT vs. IOUT; VOUT(NOM) = 2.5V
160
2.503
120
Output Voltage (V)
Dropout Voltage (mV)
140
100
80
60
40
2.502
2.501
2.5
20
0
2.499
0
100
200
300
400
500
0
100
Load Current (mA)
Figure 5. VOUT vs. Temperature; VOUT(NOM) = 2.5V
300
400
500
Figure 6. VOUT vs. VIN; VOUT(NOM) = 2.5V
2.505
3
2.504
Iout = 0mA
2.5
2.503
Output Voltage (V)
Output Voltage (V)
200
Output Current (mA)
2.502
2.501
2.5
2.499
Iout = 500mA
2
1.5
1
2.498
0.5
2.497
2.496
-45 -30 -15
0
0
15
30
45
60
75
90
0
0.5
Temperature (°C)
Figure 7. Quiescent Current vs. VIN; no load
1.5
2
2.5
3
Figure 8. Quiescent Current vs. IOUT; VIN = 3.0V;
100
120
100
Quiescent Current (µA)
Quiescent Current (µA)
1
Input Voltage (V)
80
60
40
20
0
80
60
40
20
0
0
1
2
3
4
5
6
Input Voltage (V)
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0
100
200
300
400
500
Output Current (mA)
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AS1363
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
Figure 9. Quiescent Current vs. Temperature;
VIN = 3.0V
Figure 10. PSRR vs. Frequency; IOUT = 10mA,
CIN = 68nF,
-50
80
-60
PSRR (dB)
Quiescent Current (µA)
100
60
40
-70
-80
20
no l oad
Iout = 100mA
-90
45
60
75
10
90
Temperature (°C)
VOUT
IOUT
200mV/Div
20mV/DIV
VIN
VOUT
100000
5µs/Div
Figure 14. Startup; VIN = 3.0V, IOUT = 100mA
1V/DIV
EN
VOUT
1V/Div
Figure 13. Startup; VIN = 3.0V, IOUT = 100mA
EN
10000
Figure 12. Load Transient Response;
VIN = 3.0V, IOUT = 50mA to 250mA
1ms/Div
VOUT
1000
Frequency (Hz)
Figure 11. Line Transient Response;
VIN = 3.0V to 3.5V, IOUT = 100mA
1ms/Div
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100
50mV/Div
30
100mA/DIV
15
1V/Div
0
1V/DIV
0
-45 -30 -15
20µs/Div
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AS1363
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1363 is a low-dropout, low-quiescent-current linear regulator specifically designed for battery-powered devices.
The regulator supplies loads of up to 500mA and can deliver a factory-preset output voltage or user-adjustable output
voltage.
The device features a 1.2V reference, error amplifier, P-channel pass transistor, and internal feedback voltage-divider
(see Figure 15). Additional blocks include an output current limiter, thermal sensor, and shutdown logic.
Figure 15. Block Diagram
VIN
2.0V to 5.5V
1
IN
CIN
1µF
Thermal
Sensor
MOSFET
Driver
w/ILIM
VOUT
1.2V to 5.3V
6
3
On
Off
EN
Shutdown
Logic
OUT
+
Error
Amplifier
VOUT Logic
Supply Voltage
1.25V
Reference
COUT
2.2µF
5kΩ
–
R1
RPOK
100kΩ
To Controller
2
5
POK
+
–
93%VREF
SET
+
–
+
–
100mV
R2
+
–
4
GND
AS1363-AD
The 1.2V reference is connected to the error amplifier, which 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
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 is delivered back through either an internal resistive divider connected to OUT or an external resistor network connected to SET (see Figure 15). The comparator examines VSET/BYP and selects the feedback path. If
VSET/BYP is less than 50mV, the internal feedback path is used and the output is regulated to the factory-preset voltage
(see Ordering Information on page 13).
Internal P-Channel Pass Transistor
The AS1363 features a P-channel MOSFET pass transistor and consumes only a maximum of 200µA of quiescent
current under heavy loads as well as in dropout.
Shutdown
If pin EN is connected to GND the AS1363 is disabled. In shutdown mode all internal circuits are turned off, reducing
supply current to 30nA (typ.). For normal operation pin EN must be connected to IN. During shutdown, POK is low.
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AS1363
Datasheet - D e t a i l e d D e s c r i p t i o n
Output Voltage Selection
The AS1363 is available in two versions (see Ordering Information on page 13). One version can only operate at one
fixed output voltage and the other version can operate with a preset output voltage or with user-adjustable output voltages (1.2V to 5.3V).
!
For the fixed output voltage version connect a capacitor CBYP from pin BYP to VOUT to improve PSRR and Noise
performance (see Figure 16).
!
To use the factory preset output voltage of the user-adjustable output voltage version, connect pin SET to GND
(see Figure 17).
!
For configurations using an output voltage other than the factory preset, a voltage-divider from OUT to SET to
GND is required, as shown in (see Figure 1 on page 1). A value for R2 in the 25kΩ to 100kΩ range should be sufficient. Calculate the value for R1 as:
V OUT
R 1 = R 2 × ⎛ --------------------- – 1⎞
⎝ V SETBYP ⎠
(EQ 1)
Where:
VOUT is in a range from 1.2V to 5.3V.
VSET/BYP = 1.2V.
Figure 16. Fixed Output Voltage
1
VIN
2.0V to 5.5V
6
IN
VOUT
1.2V to 5.0V
OUT
CIN
1µF
COUT
2.2µF
RPOK
100kΩ
AS1363
3
On
Off
EN
2
To Controller
CBYP
10nF
POK
5
4
BYP
GND
Figure 17. Adjustable Output using preset Output Voltage
1
VIN
2.5V to 5.5V
6
IN
CIN
1µF
On
Off
COUT
2.2µF
RPOK
100kΩ
3
EN
4
GND
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VOUT
2.5V
OUT
AS1363-AD
2
To Controller
POK
5
SET
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AS1363
Datasheet - D e t a i l e d D e s c r i p t i o n
Power-OK
The AS1363 features a power-ok indicator that asserts when the output voltage falls out of regulation. The open-drain
POK output goes low when output voltage at OUT falls 6% below its nominal value. A 100kΩ pull-up resistor from POK
to a (typically OUT) provides a logic control signal.
POK can be used as a power-on-reset (POR) signal to a microcontroller or can drive an external LED to indicate a
power failure condition.
Note: POK is low during shutdown.
Current Limit
The AS1363 features current limiting circuitry that monitors the pass transistor, limiting short-circuit output current to
0.8A (typ). The circuitry of the AS1363 allows that the output can be shorted to ground for an indefinite period of time
without damaging the device.
Thermal Overload Protection
Integrated thermal overload protection limits the total power dissipation in the AS1363. When the junction temperature
(TJ) exceeds +170ºC typically, the pass transistor is turned off. Normal operation is continued when TJ drops approximately 20ºC.
Note: Regardless of the hysteresis, continuous short-circuit condition will result in a pulsed output.
Operating Region and Power Dissipation
Maximum power dissipation depends on the thermal resistance of the IC package and circuit board, the temperature
difference between the die junction and ambient air, and the rate of air flow.
The power dissipated in the device is given as:
PD = I OUT × ( V IN – V OUT )
(EQ 2)
The AS1363 can deliver up to 0.5A RMS and operates with input voltages up to +5.5V, but not at the same time. High
output currents can only be sustained when input/output differential voltages are low.
The maximum allowed power dissipation is 800mW at TAMB = +70ºC or:
T J ( max ) – T AMB
PDMAX = -------------------------------------θ JC + θ CA
(EQ 3)
Where:
TJ(MAX) - TAMB is the temperature difference between the device die junction and the surrounding air.
θJC is the thermal resistance of the junction to the case.
θCA is the thermal resistance from the case through the PCB, copper traces, and other materials to the surrounding air.
Note: For best heat transfer, the copper area should be equally shared between the IN, OUT, and GND pins.
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AS1363
Datasheet - A p p 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
Input and output capacitors are required for stable operation of the AS1363 over the full temperature range and with
load currents up to 500mA. Connect CIN and COUT as close to the AS1363 as possible to minimize the impact of PC
board trace inductance.
For CIN, connect a 1µF capacitor between IN and ground. CIN lowers the source impedance of the input supply.
Reduce noise and improve load-transient response, stability, and power supply rejection by using larger output capacitors, such as 10µF.
For COUT connect a 2.2µF low-ESR capacitor between OUT and ground. The output capacitor’s ESR affects stability
and output noise. Use output capacitors with an ESR of 0.1Ω or less to ensure stability and optimum transient
response. Surface-mount ceramic capacitors have very-low ESR and are commonly available in values up to 10µF.
For output voltages less than 2V, use a 4.7µF low-ESR output capacitor for COUT.
Noise, Power Supply Rejection Ratio, and Transient Response
The AS1363 is designed to operate with low dropout voltages and low quiescent currents in battery-powered systems
while still maintaining good noise response, transient response, and AC rejection. See Typical Operating Characteristics on page 6 for a plot of power-supply rejection ratio (PSRR) versus frequency. When operating from noisy sources,
improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques.
Dropout Voltage
Because the AS1363 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source
on-resistance (RDS(ON)) multiplied by the load current:
V DROPOUT = V IN – V OUT = R DS ( ON ) × I OUT
(EQ 4)
Note: The AS1363 ground current remains below 200µA in dropout.
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AS1363
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
The device is available in an 6-pin SOT23 package.
Figure 18. 6-pin SOT23 Package
Notes:
1. Dimensions are in millimeters (mm).
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 SC74A.
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Revision 1.03
Symbol
A
A1
A2
b
C
D
E
E1
L
E
e1
Min
0.90
0.00
0.90
0.30
0.09
2.80
2.60
1.50
0.30
α
0º
Nom
Max
1.45
0.15
1.30
0.50
0.20
3.05
3.00
1.75
0.55
0.95Ref
1.90Ref
8º
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AS1363
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The device is available as the standard products shown in Table 5.
Table 5. Ordering Information
Model
Marking
Output
SET/BYP
Delivery Form
Package
AS1363-BSTT-AD
ASQ9
adjustable
(preset to 2.5V)
SET
Tape and Reel
6-pin SOT23
AS1363-BSTT-12*
ASRY
1.2V
BYP
Tape and Reel
6-pin SOT23
AS1363-BSTT-15*
ASRA
1.5V
BYP
Tape and Reel
6-pin SOT23
AS1363-BSTT-18*
ASRB
1.8V
BYP
Tape and Reel
6-pin SOT23
AS1363-BSTT-30*
ASRC
3.0V
BYP
Tape and Reel
6-pin SOT23
AS1363-BSTT-33*
ASRD
3.3V
BYP
Tape and Reel
6-pin SOT23
AS1363-BSTT-45*
ASRE
4.5V
BYP
Tape and Reel
6-pin SOT23
All devices are RoHS compliant and free of halogene substances.
*Future product.
Non-standard devices are available between 1.4V and 4.6V in 50mV steps and between 4.6V and 5.0V in 100mV
steps. For more information and inquiries contact http://www.austriamicrosystems.com/contact-us
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AS1363
Datasheet
Copyrights
Copyright © 1997-2009, 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.
Disclaimer
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 life-sustaining 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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Contact Information
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:
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