AS1355 Datasheet, PDF (1/11 Pages) ams AG – 300mA, Triple LDO

Preliminary Datasheet
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 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.
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: ≤1µA
! Supply Current Without Load: 160µA (typ)
! 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
Figure 1. AS1355 - Typical Application Diagram
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.
+5V ^VDD1
VDD2
1µF
VDD3
VDDA
EN1
µP
EN2
EN3
AS1355
VOUT1
3.3V
1µF
VOUT2
1.8V
1µF
VOUT3
1.5V
REF
1µF
C_REF = 100nF
(Improved Noise Performance)
GND
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