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Preliminary Datasheet
AS1355
3 0 0 m A , Tr i p l e L D O
1 General Description
The AS1355 is a high-performance triple CMOS lowdropout voltage regulator in a single QFN package. The efficient set of programmable power supplies is optimized to deliver the best compromise between quiescent current and regulator performance for mobile phones, PDAs, MP3 players, and other battery powered devices. Stability is guaranteed with ceramic output capacitors of only 1F (20% - X5R) up to 4.7F (20% - X5R). The low equivalent series resistance (ESR) of these capacitors ensures low output impedance at high frequencies. Regulation performance is excellent even under low dropout conditions, when the power transistor has to operate in linear mode. The low-noise performance allows direct connection of noise sensitive circuits without additional filtering networks. The AS1355 is available in a 16-pin QFN 3x3 package.
2 Key Features
! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
3 Independent Voltage Regulators with Shutdown Output Current: 300mA each LDO Programmable Output Voltage Range: 1.25V to 3.6V in 50mV Steps Accuracy: 1.0% PSRR: 70dB at 1kHz, 60dB at 100kHz Line Regulation: 2mV Load Regulation: 0.6mV Supply Range: 2.3V to 5.5V 0.1V Dropout Voltage @ Iload = 200mA Shutdown Current: 1A Supply Current Without Load: 160A (typ) Softstart for Low Inrush Current Stable with low ESR Ceramic Capacitors from 1F to 4.7F Low Noise: 40V rms @10Hz to 100kHz Bandwidth Thermal Protection Over-Current Protection Temperature Range: -40C to +85C 16-pin QFN 3x3 Package
3 Applications
The AS1355 is ideal for cordless and mobile phones, MP3 players, CD and DVD players, PDAs, hand-held computers, digital cameras, and any other hand-held battery-powered device. Figure 1. AS1355 - Typical Application Diagram
+5V VDD1 VOUT1 1F VDD2 1F VDD3 VOUT3 VOUT2 1F 1.5V 1F REF CREF = 100nF (Improved Noise Performance) GND 1.8V 3.3V
AS1355
VDDA EN1
P
EN2 EN3
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AS1355
Preliminary Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
EN2 16 EN1 1 EN3 15 NC 14 REF 13 12 GND
VDDA
2
AS1355
11 GND
VDD1
3 17 4 5 6 7 8 NC
10 NC
VDD2
9
VDD3
VOUT1 VOUT2 VOUT3
Pin Descriptions
Table 1. Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 9 10 11, 12 13 14 15 16 17 Pin Name EN1 VDDA VDD1 VDD2 VOUT1 VOUT2 VOUT3 NC VDD3 NC GND REF NC EN3 EN2 NC Description Active-High Enabel Input 1. Pull this pin to low to disable the regulated output voltage VOUT1. Analog Power Supply Voltage Unregulated Input Voltage 1 Unregulated Input Voltage 2 Regulated Output Voltage 1 Regulated Output Voltage 2 Regulated Output Voltage 3 Not Connected Unregulated Input Voltage 3 Not Connected Ground. Note: All GND pins must be connected together externally. Reference Voltage. Note: Connect to a 100nF capacitor during normal operation. Not Connected Active-High Enabel Input 3. Pull this pin to low to disable the regulated output voltage VOUT3. Active-High Enabel Input 2. Pull this pin to low to disable the regulated output voltage VOUT2. Exposed Pad. This pad is not connected internally, it can be connected to GND.
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AS1355
Preliminary 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 2 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 the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter ENx, VDDx to GND VOUTx to GND Any other pin to GND Thermal Resistance JA Package-Body Peak Temperature Operating Temperature Storage Temperature Electrostatic Discharge Protection (ESD) Level -40 -65 2 Min -0.3 -0.3 -0.3 Max 7 5 VDD + 0.3 33 Units V V V C/W on PCB 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". Comments
260
C
85 150
C C kV HBM - Norm: MIL 883 E method 3015.
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AS1355
Preliminary 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
VDD = 4V, COUT = 1F, TAMB = -40C to +85C (Typ values are for TAMB = 25C), unless otherwise specified; Table 3. Electrical Characteristics Symbol VDD VOUT RON PSRR 1 IOFF IVDD tset 1 Parameter Supply Voltage Range Output Voltage Range On Resistance Power Supply Rejection Ratio Shut Down Current Supply Current Output Voltage Settling Time f = 1kHz, CREF = 100nF f = 100kHz, CREF = 100nF ENx = Low, TAMB = +25C Without Load ILOAD Switched from 0 to 100mA CREF = 100nF Pre-charged tstart 1 Start-up Time 2 CREF = 0nF Uncharged CREF = 100nF Uncharged VOUT VLINEREG VLOADREG VIH VIL ILOAD ILIMIT VNoise Output Voltage Tolerance Line Regulation, Static Load Regulation, Static Enable Input Voltage High Enable Input Voltage Low Output Current Output Current Limitation Output Noise Voltage Thermal Protection 1. Guaranteed by design and verified by lab evaluation. 2. Startup is performed if any EN pin goes high. 10Hz to 100kHz, CREF = 100nF 0 450 40 150 ILOAD = 0mA, TAMB = 25C ILOAD = 0 to 300mA VOUT(NOM)+0.3V to 5.5V ILOAD = 0 to 50 mA ILOAD = 0 to 300 mA 1.5 0.4 300 -1 -2 -1 0.5 3 200 15 1 2 1 2.5 10 160 Conditions Min 2.3 1.25 0.5 70 60 1 240 50 300 Typ Max 5.5 3.6 1 Unit V V dB A A s s s ms % %
%
mV 1 mV 1 V V mA mA VRMS C
Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods.
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AS1355
Preliminary 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
VDD = 4V, VOUT = 3.3V, COUT = 1F, TAMB = +25C (unless otherwise specified); Figure 3. Load Regulation; VOUT vs. IOUT
3.36 3.34
Figure 4. Line Regulation; VOUT vs. VIN
1.84 1.83
Output Voltage (V)
3.32 3.3 3.28 3.26 3.24 0 50 100 150 200 250 300
Output Voltage (V)
1.82 1.81 1.8 1.79 1.78 1.77 1.76 2 2.5 3 3.5 4 4.5 5 5.5
Output Current (mA) Figure 5. Output Voltage vs. Temp.; IOUT = 1mA
3.36 3.34
Input Voltage (V) Figure 6. Quiescent Current vs. Temperature
240 220
Quiescent Current (A)
Output Voltage (V)
200 180 160 140 120 100 80 -45 -30 -15
3.32 3.3 3.28 3.26 3.24 -45 -30 -15
0
15
30
45
60
75
90
0
15
30
45
60
75
90
Temperature (C) Figure 7. Startup; no Load, no CREF
Temperature (C) Figure 8. Startup; RLOAD = 11, no CREF
2V/Div
VDD
VDD
VOUT
1V/Div
50s/Div
VOUT
50s/Div
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1V/Div
2V/Div
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AS1355
Preliminary 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. Startup; no Load, CREF = 100nF
Figure 10. Startup; RLOAD = 11, CREF = 100nF
VDD
2V/Div
VDD
1V/Div
2ms/Div
2ms/Div
Figure 11. Startup; no Load, CREF = 100nF (precharged)
Figure 12. Startup; RLOAD = 11, CREF = 100nF (precharged)
2V/Div
1V/Div
20s/Div
20s/Div
Figure 13. Load Transient Response; IOUT = 0 to 300mA
Figure 14. Load Transient Response; IOUT = 300 to 0mA
20mV/Div
100mA/Div
10s/Div
500s/Div
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100mA/Div
IOUT
IOUT
20mV/Div
VOUT
VOUT
1V/Div
VOUT
VOUT
2V/Div
EN
EN
1V/Div
VOUT
VOUT
2V/Div
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AS1355
Preliminary Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
Figure 15. AS1355 - Block Diagram
VDD1
Thermal Protection Overcurrent Protection Softstart
VOUT1
VREF EN1
Control
VDD2
Thermal Protection Overcurrent Protection Softstart
VOUT2
VREF EN2
Control
VDD3
Thermal Protection Overcurrent Protection Softstart
VOUT3
VREF EN3
Control
VDDA
Reference Voltage
REF
AS1355
GND
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AS1355
Preliminary Datasheet - Ty p i c a l A p p l i c a t i o n
9 Typical Application
Figure 16. Typical Application
+5V
VDD1
VOUT1 1F
3.3V
VDD2 1F
VOUT2 1F
1.8V
VDD3
VOUT3 1F
1.5V
VDDA
REF
AS1355
EN1 EN2 GND
CREF = 100nF (Improved Noise Performance)
Microprocessor
EN3
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AS1355
Preliminary 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 AS1355 is available in a 16-pin QFN 3x3 package. Figure 17. 16-pin QFN 3x3 Package
13
14
15
16
12 11 10 9
1 2 3 4
8
7
6
5
m m
Symbol A A1 A3 b D E D2 E2 Notes:
Min 0.80 0.00 0.18
Typ 0.85 0.203 REF 0.23 3.00 BSC 3.00 BSC 1.90 1.90
Max 0.90 0.05 0.28
1.80 1.80
2.00 2.00
Symbol e L L1 aaa bbb ccc ddd eee
Min 0.25 0.00
Typ 0.50 BSC 0.30 0.10 0.10 0.10 0.05 0.08
Max 0.35 0.10
1. Dimensioning and tolerancing conform to ASME Y14.5m-1994. 2. All dimensions are in millimeters while angle is in degrees (). 3. Dimension b applies to metallized terminal and is measured between 0.25mm and 0.30mm from the terminal tip. Dimension L1 represents terminal full back from package edge up to 0.1mm is acceptable. 4. Coplanarity applies to the exposed heat slug as well as the terminal. 5. Radius on terminal is oprional.
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AS1355
Preliminary 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 4. Table 4. Ordering Information Ordering Code AS1355-BQFT-WGD Marking ASSG Output VOUT1 = 3.3V VOUT2 = 1.8V VOUT3 = 1.5V Non-standard devices are available between 1.25V and 3.6V in 50mV steps. For more information and inquiries contact http://www.austriamicrosystems.com/contact 300mA, Triple LDO Tape and Reel 16-pin QFN 3x3 Description Delivery Form Package
Note: All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect For further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicrosystems.com/distributor
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AS1355
Preliminary Datasheet
Copyrights
Copyright (c) 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 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 Tobelbaderstrasse 30 A-8141 Unterpremstaetten, 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
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