AS1352 Datasheet, PDF (1/2 Pages) ams AG – Programmable Quad LDO

austriamicrosystems
AS1352
Programmable Quad LDO
Product Brief
1 General Description
The AS1352 is a high-performance quad CMOS low-
dropout voltage regulator in a single 4x4 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.
The one-time-programmable (OTP) function provides
greater design flexibility by allowing for independent pro-
gramming of the output voltage for each regulator on-
site. The OTP function allows for fast prototyping as well
as full-production in the field. Factory trimmed versions
are also available.
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 AS1352 is available in a 12-pin QFN 4x4 package
or in a wafer bumping package.
2 Key Features
! _{4 Independent Voltage Regulators with Shutdown}
! _{Output Current: 200mA each LDO}
! _{One Time Programmable Output Voltage}
(User- or Factory-Trimmed)
! _{Programmable Output Voltage Range: 1.8 to 3.3V in}
0.1V Steps
! _{Accuracy: ±2%}
! _{PSRR: 70dB at 1kHz, 40dB at 100kHz}
! _{Line Regulation: ±2mV}
! _{Load Regulation: ±0.6mV}
! _{Supply Range: 3 to 5.5V}
! _{0.2V Dropout Voltage @ I = 200mA}
! _{Shutdown Current: ≤1µA}
! _{Supply Current Without Load: 225µA (typ)}
! _{Softstart for Low Inrush Current}
! _{Stable with low ESR Ceramic Capacitors from 1 to}
4.7µF
! _{Low Noise – 40µV rms @10Hz to 100kHz Bandwidth}
! _{Thermal Protection}
! _{Over-Current Protection}
! _{Temperature Range: -40 to +85°C}
! _{Wafer Bumping}
! _{QFN12 4x4, Pitch 0.8mm Package}
Figure 1. Pinout Assignments (Top View)
3 Applications
The AS1352 is ideal for cordless and mobile phones,
MP3 players, CD and DVD players, PDAs, handheld
computers, digital cameras, and any other hand-held
battery-powered device.
EN3 EN4 REF
12
11
10
EN2 1
EN1 2
VDD 3
AS1352
9 ^TRIM
8 ^VDD
7 ^VOUT4
4
5
6
VOUT1 VOUT2 VOUT3
13 GND (Exposed Pad)
© 1997-2005, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
Revision 1.13
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