AS1332

650mA, Step-Down DC-DC Conver ter for RF Power Amplifiers

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1 General Description

The AS1332 is a step-down DC-DC converter designed

to power radiofrequency (RF) power amplifiers (PAs)

from a single Li-Ion battery. The device also achieves

high-performance in mobile phones and similar RF PA

applications.

The AS1332 steps down an input voltage of 2.7V to 5.5V

to output voltages ranging from 1.3V to 3.16V. Using a

controlling power levels and efficiency of the RF PA.

The RF interferences are minimized due to the fixed-

frequency PWM operation. The battery consumption is

reduced to 0.01µA (typ.) during shutdown.

Because of the high switching frequencies (2 MHz) tiny

surface-mount components can be used. Additional to

the small size the amount is also small. Only three

external components are required, an inductor and two

ceramic capacitors.

The AS1332 is available in a 8-pin WL-CSP.

2 Key Features

!

PWM Switching Frequency: 2MHz

!

Single Lithium-Ion Cell Operation (2.7V to 5.5V)

!

Dynamic Programmable Output Voltage (1.3V to

3.16V)

!

Maximum load capability of 650mA

!

400mA) from internal synchronous rectification

!

Current Overload Protection

!

Thermal Overload Protection

!

Soft Start

!

8-pin WL-CSP

3 Applications

The AS1332 is an ideal solution for cellular phones,

hand-held radios, RF PC cards, and battery powered RF

devices.

Figure 1. Typical Application Circuit

AS1332

PGND

AGND

VCON

EN

PVIN

VDD

SW

FB

1.3V to 3.16V

4.7 µF

3.3 µH

2.7V to 5.5V

10 µF

0.52V to 1.27V