Datasheet
AS1334
6 5 0 m A , U l t r a l o w R i p p l e St e p D o w n D C / D C C o n v e r t e r
1 General Description
The AS1334 is a step-down DC-DC converter designed
to power portable applications from a single Li-Ion
battery. The device also achieves high-performance in
mobile phones and other applications requiring low
dropout voltage.
The AS1334 operates from an input voltage range of 2.7
to 5.5V while providing output voltages of 1.2, 1.5, 1.8,
2.5, 3.0 and 3.3V.
Fixed-frequency PWM operation minimizes RF
interference. Shutdown function turns the device off and
reduces battery consumption to 0.01µA (typ.).
The AS1334 is available in a TDFN(3x3) 8-pin package.
A high switching frequency (2 MHz) allows use of tiny
surface-mount components. Only three small external
surface-mount components, an inductor and two
ceramic capacitors are required.
2 Key Features
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Output Voltage Ripple: 2mV
PWM Switching Frequency: 2MHz
Single Lithium-Ion Cell Operation
Output Voltage Range: 1.2V to 3.4V
(available in 100mV steps,
Fixed Output Voltages:
- 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.3V
Maximum Load Capability of 650mA
97% High Efficiency, 94% Average Efficiency
Current Overload Protection
Thermal Overload Protection
Power-OK
Soft Start
Low Dropout Voltage (140 mΩ Typ PFET)
TDFN(3x3) 8-pin
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3 Applications
The AS1334 is an ideal solution to supply noise
sensitive applications as cellular phones, hand-held
radios, RF PC cards, battery powered RF devices, RFID
chipsets, A/D Converter, Sensors and OpAmps.
Figure 1. AS1334 - Typical Application Circuit
V
IN
10 µF
PVIN
SW
3.3 µH
V
OUT
VDD
FB
AS1334
10 µF
ON
OFF
EN
POK
PGND
SGND
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