AS1355 austriamicrosystems, AS1355 Datasheet

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AS1355

Manufacturer Part Number
AS1355
Description
300ma, Triple Ldo
Manufacturer
austriamicrosystems
Datasheet
Datasheet
A S 1 3 5 5
3 0 0 m A , Tr i p l e L D O
1 General Description
The AS1355 is a high-performance triple CMOS low-
dropout voltage regulator in a single QFN package. The
efficient set of programmable power supplies is opti-
mized to deliver the best compromise between quies-
cent current and regulator performance for mobile
phones, PDAs, MP3 players, and other battery powered
devices.
Stability is guaranteed with ceramic output capacitors of
only 1µF (±20% – X5R) up to 4.7µF (±20% – X5R). The
low equivalent series resistance (ESR) of these capaci-
tors 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 net-
works.
The AS1355 is available in a 16-pin QFN 3x3 package.
Figure 1. AS1355 - Typical Application Diagram
www.austriamicrosystems.com/LDOs/AS1355
µP
1µF
+5V
VDDA
VDD3
VDD1
VDD2
EN1
EN2
EN3
AS1355
Revision 1.00
2 Key Features
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.
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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
Load Regulation: 3mV (0 to 300mA)
Supply Range: 2.3V to 5.5V
0.1V Dropout Voltage @ Iload = 200mA
Shutdown Current: ≤1µA
Supply Current Without Load: 160µA
Softstart for Low Inrush Current
Stable with low ESR Ceramic Capacitors from 1µF
to 4.7µF
Low Noise: 40µV rms @10Hz to 100kHz Bandwidth
Thermal Protection
Over-Current Protection
Temperature Range: -40°C to +85°C
16-pin QFN 3x3 Package
VOUT1
VOUT2
VOUT3
REF
GND
1µF
1µF
1µF
C
(Improved Noise Performance)
REF
= 100nF
3.3V
1.8V
1.5V
1 - 11

Related parts for AS1355

AS1355 Summary of contents

Page 1

... The low-noise performance allows direct connection of noise sensitive circuits without additional filtering net- works. The AS1355 is available in a 16-pin QFN 3x3 package. Figure 1. AS1355 - Typical Application Diagram +5V 1µF µP www.austriamicrosystems.com/LDOs/AS1355 ...

Page 2

... Active-High Enabel Input 2. Pull this pin to GND to disable the regulated output 16 EN2 voltage V Exposed Pad. This pad is not connected internally, it can be connected to GND www.austriamicrosystems.com/LDOs/AS1355 EN2 EN3 NC REF EN1 GND 1 12 VDDA GND 2 11 AS1355 VDD1 VDD2 VDD3 VOUT1 VOUT2 VOUT3 NC Description . OUT1 . OUT3 . ...

Page 3

... VOUTx to GND -0.3 Any other pin to GND -0.3 Thermal Resistance Θ JA Package-Body Peak Temperature Operating Temperature -40 Storage Temperature -65 Electrostatic Discharge Protection (ESD) Level www.austriamicrosystems.com/LDOs/AS1355 Max Units 0 ºC/W The reflow peak soldering temperature (body temperature) specified is in accordance with 260 ° ...

Page 4

... Guaranteed by design and verified by lab evaluation. 2. Startup is performed if any EN pin goes high. Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. www.austriamicrosystems.com/LDOs/AS1355 = 25°C), unless otherwise specified; AMB Conditions Min 1 ...

Page 5

... Output Current (mA) Figure 5. Output Voltage vs. Temp.; I 3.36 3.34 3.32 3.3 3.28 3.26 3.24 -45 -30 - Temperature (°C) Figure 7. Startup; no Load REF 50µs/Div www.austriamicrosystems.com/LDOs/AS1355 = +25°C (unless otherwise specified); AMB Figure 4. Line Regulation; V OUT 1.84 1.83 1.82 1.81 1.8 1.79 1.78 1.77 1.76 250 300 2 2.5 = 1mA Figure 6. Quiescent Current vs. Temperature OUT 240 ...

Page 6

... REF 2ms/Div Figure 11. Startup; no Load 100nF (pre- REF charged) 20µs/Div Figure 13. Load Transient Response 300mA OUT 10µs/Div www.austriamicrosystems.com/LDOs/AS1355 Figure 10. Startup 11Ω, C LOAD 2ms/Div Figure 12. Startup 11Ω, C LOAD charged) 20µs/Div Figure 14. Load Transient Response 300 to 0mA OUT 500µ ...

Page 7

... AS1355 Datasheet - Detailed Description Figure 15. AS1355 - Block Diagram VDD1 EN1 VDD2 EN2 VDD3 EN3 VDDA www.austriamicrosystems.com/LDOs/AS1355 VOUT1 Thermal Protection Overcurrent Protection Softstart V REF Control VOUT2 Thermal Protection Overcurrent Protection Softstart V REF ...

Page 8

... Datasheet - Typical Application Figure 16. Typical Application VDD1 +5V VDD2 1µF VDD3 VDDA EN1 EN2 Microprocessor EN3 www.austriamicrosystems.com/LDOs/AS1355 VOUT1 1µF VOUT2 1µF VOUT3 1µF REF C = 100nF AS1355 REF (Improved Noise Performance) GND Revision 1.00 3.3V 1.8V 1. ...

Page 9

... AS1355 Datasheet - Package Drawings and Markings The AS1355 is available in a 16-pin QFN 3x3 package. Figure 17. 16-pin QFN 3x3 Package Symbol Min ...

Page 10

... Non-standard devices are available between 1.25V and 3.6V in 50mV steps. For more information and inquiries con- tact http://www.austriamicrosystems.com/contact Note: All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: For further information and requests, please contact us or find your local distributor at www.austriamicrosystems.com/LDOs/AS1355 Table 4. Output Description V = 3.3V ...

Page 11

... 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 www.austriamicrosystems.com/LDOs/AS1355 Revision 1. ...

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