07/2012

ALT6725

3.4 V Linear Power Amplifier Module

PRELIMINARY DATA SHEET - Rev 1.0

FEATURES

• InGaP HBT Technology

• High Efficiency:

• Low Quiescent Current: 4 mA

• Internal Voltage Regulation

• Built-in Directional Coupler

• Suitable for SMPS and average power tracking

systems with variable supply voltages

• APT can reduce TS.09 average power

consumption more than 25%

• Reduced External Component Count

• Thin Package: 0.9 mm

APPLICATIONS

• Dual-band Wireless Handsets and Data Devices

for LTE/CDMA/EVDO networks:

• UMTS Band 5, 6, 18, 19, & 26

• UMTS Band 2 & 25

• Cellular BC 0 and 10

• PCS BC 1 and 14

PRODUCT DESCRIPTION

ALT6725 addresses the demand for increased

integration in dual-band handsets for LTE networks.

The small footprint 3 mm x 5 mm x 0.9 mm surface

mount RoHS compliant package contains independent

RF PA paths to ensure optimal performance in both

frequency bands in less board area than two single

band PAs. The package pinout was chosen to enable

handset manufacturers to independently provide

bias to both power amplifiers and simplify control

with common mode pins. The ALT6725 is part of

ANADIGICS’ 3rd generation of High-Efficiency-at-

Low-Power (HELP3E™) family of power amplifiers,

which deliver low quiescent currents and significantly

greater efficiency through selectable bias modes for

high, medium and low power operation. The ALT6725

is designed for use both with and without average

power tracking (APT). APT can be used to optimize

the Vcc level for the desired output power level and

linearity, which greatly reduces the total current

drawn from the battery. This feature, in conjunction

with selectable operating modes, enables significant

improvements in overall power added efficiency of the

ALT6725 across the entire dynamic range of operating

powers. APT requires use of an external variable

voltage supply (DC-DC converter), which is used to

provide the variable voltage to Vcc pad of the amplifier.

A low-leakage shutdown mode increases standby

time. This PA has built-in directional couplers for each

band, with a common coupler output port CPL_OUT.

The 3 mm x 5 mm x 0.9 mm surface mount package

incorporates matching networks optimized for output

power, efficiency and linearity in a 50 Ω system. The

device is manufactured on an advanced InGaP HBT

MMIC technology offering state-of-the-art reliability,

temperature stability, and ruggedness.

Figure 1: Block Diagram

1

13

11

14

12

3

4

2

GND

5

6

10

9

Bias Control

Voltage Regulation

GND at Slug (pad)

8

7

GND

Bias Control

Voltage Regulation

CPL

CPL