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MAX8896

更新时间： 2024-11-05 11:14:27
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美信 - MAXIM 转换器放大器功率放大器
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Dual PWM Step-Down Converter in a 2mm x 2mm Package for WCDMA PA and RF Power

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19-4663; Rev 0; 5/09  
Dual PWM Step-Down Converter in a 2mm x  
2mm Package for WCDMA PA and RF Power  
MAX896  
General Description  
Features  
The MAX8896 dual step-down converter is optimized  
for powering the power amplifier (PA) and RF transceiv-  
er in WCDMA handsets. This device integrates a high-  
efficiency PWM step-down converter (OUT1) for  
medium and low-power transmission, and a 140mΩ  
(typ) bypass FET to power the PA directly from the bat-  
tery during high-power transmission. A second high-  
efficiency PWM step-down converter (OUT2) supplies  
power directly to a high PSRR, low output noise, 200mA  
low-dropout linear regulator (LDO) to power the RF  
transceiver.  
o PA Step-Down Converter (OUT1)  
7.5µs (typ) Settling Time for 0.5V to 1V Output  
Voltage Change  
Dynamic Output Voltage Setting from 0.5V to  
V
BATT  
140mΩ Bypass PFET and 100% Duty Cycle  
for Low Dropout  
2MHz Switching Frequency  
Low Output Voltage Ripple  
700mA (min) Output Drive Capability  
2% Gain Accuracy  
Fast switching allows the use of small ceramic input and  
output capacitors while maintaining low ripple voltage.  
The feedback network is integrated reducing external  
component count and total solution size. OUT1 uses an  
analog input driven by an external DAC to control the  
output voltage linearly for continuous PA power adjust-  
ment. At high duty cycle, OUT1 automatically switches to  
bypass mode, connecting the input to the output through  
a low-impedance (140mΩ, typ) MOSFET.  
Tiny External Components  
o RF Step-Down Converter (OUT2)  
2MHz Fixed Switching Frequency  
94% Peak Efficiency  
100% Duty Cycle  
2% Output Accuracy Over Load, Line, and  
Temperature  
200mA (min) Output Drive Capability  
Tiny External Components  
OUT2 is a 2MHz fixed-frequency, step-down converter  
capable of operating at 100% duty cycle. Output accu-  
racy is 2% over load, line, and temperature. The out-  
put of OUT2 is preset to 3.1V to provide power to a  
o Low-Noise LDO  
Guaranteed 200mA Output  
High 65dB (typ) PSRR  
Fixed Output Voltage  
200mA, 2.8V LDO designed for low noise (16µV  
,
RMS  
typ), high PSRR (65dB, typ) operation. This configura-  
tion provides noise attenuation for the RF transceiver  
power supply in the 100Hz to 100kHz range.  
Low Noise (16µV  
, typ)  
RMS  
o Simple Logic ON/OFF Controls  
o Low 0.1µA Shutdown Current  
o 2.7V to 5.5V Supply Voltage Range  
o Thermal Shutdown  
Other features include separate output enables, low-  
supply current shutdown, output overcurrent, and  
overtemperature protection. The MAX8896 is available  
in a 16-bump, 2mm x 2mm UCSP™ package (0.7mm  
max height).  
o 2mm x 2mm UCSP Package (4 x 4 Grid)  
Applications  
WCDMA/NCDMA Cellular Handsets  
Ordering Information  
LDO  
VOLTAGE  
Smartphones  
PART  
PIN-PACKAGE  
MAX8896EREE+T  
16 UCSP (0.5mm pitch)  
2.80V  
Note: Device operates over the -40°C to +85°C temperature  
range.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
T = Tape and reel.  
Pin Configurations appear at end of data sheet.  
UCSP is a trademark of Maxim Integrated Products, Inc.  
________________________________________________________________ Maxim Integrated Products  
1
For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.  
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