AS1355_04 Datasheet, PDF (1/12 Pages) ams AG – 300mA, Triple LDO

AS1355
300mA, Triple LDO
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 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 1µF
(±20% – X5R) up to 4.7µF (±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
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
Packages:
- 16-pin QFN 3x3
- 16-pin TQFN 3x3
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
VDD2
1µF
VDD3
VDDA
EN1
µP
EN2
EN3
AS1355
VOUT1
3.3V
1µF
VOUT2
1.8V
1µF
VOUT3
1.5V
1µF
REF
C_REF = 100nF
(Improved Noise Performance)
GND
www.ams.com/LDOs/AS1355
Revision 1.3
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