Dual LDO with Programmable Output Voltage Between 1.8V and 3.3V0 pages

AS1351
Programmable Dual LDO
www.austriamicrosystems.com Revision 1.21 1 - 10
Data Sheet
1 General Description
The AS1351 is a high-performance dual CMOS lowdropout
voltage regulator in a single 3x3mm 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.
The one-time-programmable (OTP) function provides
greater design flexibility by allowing for independent programming
of the output voltage for each regulator onsite.
The OTP function allows for fast prototyping reducing
development times and costs significant. Factory
trimmed versions for full-production are also available.
Stability is guaranteed with ceramic output capacitors of
only 1ìF (±20% – X5R) up to 4.7ìF (±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 AS1351 is available in a 12-pin QFN 3x3mm package.
Figure 1. Pinout Assignments (Top View)
2 Key Features
! 2 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: ±1.5%
! 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: 1ìA
! Supply Current Without Load: 125ìA (typ)
! Softstart for Low Inrush Current
! Stable with low ESR Ceramic Capacitors from 1 to
4.7ìF
! Low Noise: 40ìV rms @10Hz to 100kHz Bandwidth
! Thermal Protection
! Over-Current Protection
! Temperature Range: -40 to +85°C
! 12-pin QFN 3x3mm Package
3 Applications
The AS1351 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.
AS1351
VDD
VOUT1 VOUT2
GND
EN2
EN1
N/C N/C REF
12 11 10
4 5 6
1
2
3
9
8
7
VDD
N/C
GND
13 GND (Exposed Pad)