AS1334 Datasheet, PDF (1/17 Pages) ams AG – 650mA, Ultra low Ripple Step Down DC/DC Converter

Datasheet
AS1334
650mA, Ultra low Ripple Step Down DC/DC Converter
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
! 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, see Ordering Information
on page 16)
! 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
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
VIN
10 µF
PVIN
VDD
ON
EN
OFF
AS1334
SW ^{3.3 µH}
FB
10 µF
POK
VOUT
PGND
SGND
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Revision 1.04
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