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AS1363
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
D a ta s h e e t
1 General Description
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. 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. 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 AS1363-AD AS1363-_ _ Output Type Adjustable Fixed BYP No Yes SET Yes No
2 Key Features
! ! ! ! ! ! ! ! ! ! !
Guaranteed Output Current: 500mA Low Dropout: 150mV @ 500mA 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: 40A Low Shutdown Current: 30nA Thermal Overload Protection Output Current Limit 6-pin SOT23 Package
A low supply current (65A 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. The AS1363 is available in a 6-pin SOT23 package.
3 Applications
The device is ideal for laptops, PDAs, portable audio devices, mobile phones, cordless phones, and any other battery-operated portable device.
Figure 1. Typical Application Circuit
VIN 2.0V to 5.5V CIN 1F
1 IN
6 OUT COUT 2.2F R1
VOUT 1.2V to 5.3V
On Off
3 EN 2 POK
AS1363-AD
5 SET R2 4 GND
To Controller RPOK 100k 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
6 OUT
POK 2
AS1363
5 SET/BYP
EN 3
4 GND
Pin Descriptions
Table 2. Pin Descriptions Pin Number 1 2 Pin Name IN POK Description +2.0V to +5.5V Supply Voltage. Bypass this pin with a 1F 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 100k 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 2.2F low-ESR capacitor to GND (see Figure 1 on page 1). Note: For output voltages below 2V a 4.7F capacitor should be used.
3 4
EN GND SET
5 BYP 6 OUT
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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 IN, POK, EN, SET/BYP to GND OUT to GND Output Short-Circuit Duration Continuous Power Dissipation Operating Temperature Range Storage Temperature Range Junction Temperature -40 -65 Min -0.3 -0.3 Max +6 VIN +0.3 1 800 +85 +150 +150 Units V V min mW C C C 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). TAMB = +70C; derate 10mW/C above +70C Comments
Package Body Temperature
+260
C
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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 = 1F, COUT = 2.2F, EN = IN, TAMB = -40 to +85C (unless otherwise specified). Typical values are at TAMB = +25C. Table 4. Electrical Characteristics Symbol VIN VPOR Parameter Input Voltage Power On reset Output Voltage Accuracy (Preset Mode) Adjustable Output Voltage Range SET/BYP Voltage Threshold (Adjustable Mode) Guaranteed Output Current (RMS) Short-Circuit Current Limit In-Regulation Current Limit SET/BYP Threshold ISET IQ VIN VOUT VLNR VLDR SET/BYP Input Bias Current Quiescent Current Dropout Voltage Line Regulation Load Regulation
2
Condition
Min 2.0
Typ
Max 5.5
Unit V V
Falling, 100mV hysteresis IOUT = 100mA, TAMB = +25C, IOUT = 100mA IOUT = 1 to 500mA, VIN > (VOUT + 0.5V)
1
1.78 -0.75 -1.5 -2 1.2
1.87
1.96 +0.75 +1.5 +2 5.3
%
VOUT VSET/BYP IOUT ILIMIT
V V mA
VIN = 2.5V, IOUT = 100mA, VOUT set to 2.0V
1.17 500
1.20
1.23
VOUT = 0V VOUT > 96% of nominal value
0.55
0.8 0.8
1.2
A A
50 VSET/BYP = 1.2V IOUT = 100A IOUT = 500mA IOUT = 500mA VOUT = 2.5V -0.125 -0.001 -100
100
150 +100
mV nA A mV %/V
40 65 150
150 200 320 +0.125
VIN from (VOUT + 100mV) to 5.5V, ILOAD = 5mA IOUT = 1 to 500mA f = 1kHz, IOUT = 10mA, adjustable Output
+0.001 %/mA 65 70 60 80 VRMS 65 dB
PSRR
Ripple Rejection
f = 10kHz, IOUT = 10mA, adjustable Output f = 100kHz, IOUT = 10mA, adjustable Output 10Hz to 100kHz, IOUT = 10mA, adjustable Output 100Hz to 100kHz, IOUT = 10mA, adjustable Output
Output Voltage Noise
Shutdown IOFF VIH VIL IEN EN Input Threshold Shutdown Supply Current EN = GND, VIN = 5.5V, TAMB = 25C EN = GND, VIN = 5.5V 2.0V < VIN < 5.5V 2.0V < VIN < 5.5V EN = IN or GND, TAMB = +25C TAMB = +85C 1 5 1.6 0.6 0.03 0.5 15 A V V nA
EN Input Bias Current
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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 POK Output VOL POK Output Low Voltage Operating Voltage Range for Valid POK Signal POK Output High leakage Current POK Threshold Thermal Protection TSHDNN Thermal Shutdown Temperature 170 20 C C POK sinking 1mA POK sinking 100A POK = 5.5V, TAMB = +25C TAMB = +85C Rising edge (referenced to VOUT(NOM)) 90 1.1 1 5 94 98 0.05 0.25 5.5 V V nA % Parameter Condition Min Typ Max Unit
TSHDNN Thermal Shutdown Hysteresis
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 = 1F, COUT = 2.2F, TAMB = 25C (unless otherwise specified). Figure 3. VDROP vs. IOUT;
160 140
Figure 4. VOUT vs. IOUT; VOUT(NOM) = 2.5V
2.503
Dropout Voltage (mV)
100 80 60 40 20 0 0 100 200 300 400 500
Output Voltage (V)
120
2.502
2.501
2.5
2.499 0 100 200 300 400 500
Load Current (mA) Figure 5. VOUT vs. Temperature; VOUT(NOM) = 2.5V
2.505 2.504 2.5
Output Current (mA) Figure 6. VOUT vs. VIN; VOUT(NOM) = 2.5V
3
Iout = 0mA Iout = 500mA
Output Voltage (V)
2.502 2.501 2.5 2.499 2.498
Output Voltage (V)
0 15 30 45 60 75 90
2.503
2 1.5 1 0.5
2.497 2.496 -45 -30 -15 0 0 0.5 1 1.5 2 2.5 3
Temperature (C) Figure 7. Quiescent Current vs. VIN; no load
120 100 80 60 40 20 0 0 1 2 3 4 5 6
Input Voltage (V) Figure 8. Quiescent Current vs. IOUT; VIN = 3.0V;
100
Quiescent Current (A)
Quiescent Current (A)
80
60
40
20
0 0 100 200 300 400 500
Input Voltage (V) www.austriamicrosystems.com Revision 1.03
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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
100
Figure 10. PSRR vs. Frequency; IOUT = 10mA, CIN = 68nF,
-50
Quiescent Current (A)
80
-60
60
PSRR (dB)
no l oad Iout = 100mA
-70
40
20
-80
0 -45 -30 -15
-90 0 15 30 45 60 75 90 10 100 1000 10000 100000
Temperature (C) Figure 11. Line Transient Response; VIN = 3.0V to 3.5V, IOUT = 100mA
Frequency (Hz) Figure 12. Load Transient Response; VIN = 3.0V, IOUT = 50mA to 250mA
200mV/Div
VIN
20mV/DIV
1ms/Div
5s/Div
Figure 13. Startup; VIN = 3.0V, IOUT = 100mA
Figure 14. Startup; VIN = 3.0V, IOUT = 100mA
1V/Div
1V/DIV
VOUT
1ms/Div
VOUT
20s/Div
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1V/Div
EN
EN
100mA/DIV
VOUT
IOUT
50mV/Div
VOUT
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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 CIN 1F MOSFET Driver w/ILIM 6 On Off 3 EN Shutdown Logic + Error Amplifier - 1.25V Reference 5k OUT COUT 2.2F 1 IN Thermal Sensor
VOUT 1.2V to 5.3V
VOUT Logic Supply Voltage RPOK 100k To Controller 2 POK
R1
5 + - 93%VREF + - + - 100mV + - 4 GND SET R2
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 200A 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 25k to 100k range should be sufficient. Calculate the value for R1 as:
!
!
V OUT R 1 = R 2 x -------------------- - 1 V SETBYP Where: VOUT is in a range from 1.2V to 5.3V. VSET/BYP = 1.2V.
(EQ 1)
Figure 16. Fixed Output Voltage
VIN 2.0V to 5.5V CIN 1F
1 IN
6 OUT RPOK 100k COUT 2.2F
VOUT 1.2V to 5.0V
On Off
3 EN
AS1363
2 POK
To Controller CBYP 10nF
4 GND
5 BYP
Figure 17. Adjustable Output using preset Output Voltage
VIN 2.5V to 5.5V CIN 1F
1 IN
6 OUT RPOK 100k
VOUT 2.5V COUT 2.2F
On Off
3 EN
AS1363-AD
2 POK
To Controller
4 GND
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 100k 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 +170C typically, the pass transistor is turned off. Normal operation is continued when TJ drops approximately 20C. 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 x ( 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 = +70C or: T J ( max ) - T AMB PDMAX = ------------------------------------ JC + CA
(EQ 3)
Where: TJ(MAX) - TAMB is the temperature difference between the device die junction and the surrounding air. JC is the thermal resistance of the junction to the case. CA 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 1F 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 10F. For COUT connect a 2.2F low-ESR capacitor between OUT and ground. The output capacitor's ESR affects stability and output noise. Use output capacitors with an ESR of 0.1 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 10F. For output voltages less than 2V, use a 4.7F 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 ) x I OUT Note: The AS1363 ground current remains below 200A in dropout.
(EQ 4)
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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.
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
Nom
Max 1.45 0.15 1.30 0.50 0.20 3.05 3.00 1.75 0.55
0.95Ref 1.90Ref 0 8
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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 AS1363-BSTT-AD AS1363-BSTT-12* AS1363-BSTT-15* AS1363-BSTT-18* AS1363-BSTT-30* AS1363-BSTT-33* AS1363-BSTT-45* Marking ASQ9 ASRY ASRA ASRB ASRC ASRD ASRE Output adjustable (preset to 2.5V) 1.2V 1.5V 1.8V 3.0V 3.3V 4.5V SET/BYP SET BYP BYP BYP BYP BYP BYP Delivery Form Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Package 6-pin SOT23 6-pin SOT23 6-pin SOT23 6-pin SOT23 6-pin SOT23 6-pin SOT23 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 (c) 1997-2009, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). 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. 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.
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: http://www.austriamicrosystems.com/contact-us
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