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參數(shù)資料
| 型號(hào)： | CM3728 |
| 英文描述： | 2.5G/3G Cellular Phone Buck Regulator|Battery Management ICs |
| 中文描述： | 能工作蜂窩電話降壓穩(wěn)壓器|電池管理IC |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 267K |
| 代理商： | CM3728 |
CM3728
2.5G/3G C
ELLULAR
P
HONE
B
UCK
R
EGULATOR
FUNCTIONAL DESCRIPTION
2002/09/30
Rev. 1.0
Champion Microelectronic Corporation
Page 4
The CM3728 PWM step-down DC-DC converters are
optimized for low-voltage, battery-powered applications where
high efficiency and small size are priorities. The CM3728 is a
general-purpose device that uses external feedback resistors
to power a linear power amplifier (PA) in 2.5G/3G handsets.
An analog control signal dynamically adjusts the CM3728’s
output voltage from 0.8V to 4V with a settling time < 30μs.
The CM3728 operates at a high 1.2MHz switching frequency
that reduces external component size. Each device includes
an internal synchronous rectifier that provides for high
efficiency and eliminates the need for an external Schottky
diode. The normal operating mode uses constant frequency
PWM switching at medium and heavy loads, and
automatically pulse skips at light loads to reduce supply
current and extend battery life. An additional forced PWM
mode (with optional external synchronization) switches at a
constant frequency, regardless of load, to provide a
well-controlled spectrum in noise-sensitive applications.
Battery life is maximized by low-dropout operation at 100%
duty-cycle and a 0.1μA (typ.) logic-controlled shutdown mode.
OUPUTS
The output voltage pins (LX) are tied to the RF power amp,
via an external inductor. Output voltage is determined by the
VREF inputs.
INPUTS
The input voltage reference pin, VREF determine the output
voltages (LX). If a specific voltage is forced at the VREF pin, the
output voltage follows the voltage at the VREF pin.
OTHER SUPPLY VOLTAGES
Several inputs are provided for the supply voltages: PVDD and
BATT.
The PVDD provide the power supply to the power MOSFETs.
BATT provide the voltage supply to the logic section and internal
error amplifiers.
FEEDBACK
The VFB pin is an input that can be used for closed loop
compensation. This input is derived from the voltage output.
GND pin is a contact node of internal resistor divider for remote
sense.
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