参数资料
型号: AT73C209-EK
厂商: Atmel
文件页数: 28/63页
文件大小: 0K
描述: BOARD EVAL FOR AT73C209
标准包装: 1
系列: PMAAC™
主要目的: 电源管理,专用型: 手机
已用 IC / 零件: AT73C209
已供物品: 板,CD,文档
9. Power Supplies
9.1
9.1.1
DC to DC Boost Converter (SW1)
Features
?
?
?
?
?
Input Voltage Range: 0.9V to 1.8V (Single Alkaline Battery)
From 0 to 100 mA Maximum Output Current When Started
4 Programmable Output Voltages, 2.6V, 2.8V, 3.0V and 3.3V (Default Value).
Peak Efficiency with 50 mA Output Current
Overcurrent Protection Through External Resistor
9.1.2
Description
? DCDC is a high-efficiency DC/DC boost converter designed for single cell alkaline batteries
found in PDA's, MP3 players, and other handheld portable devices. It can work with battery
voltage as low as 0.9V, and lower than 1.8V.
? The Boost Converter is optimized for current load of 50 mA and 3.3V output voltage. It
includes a low resistive 0.2 Ohms N-channel power switch, a start-up oscillator, and an
integrated current limitation. In particular, this current limitation can be achieved using a low-
value 100 mOhms external resistor.
9.1.3
Functional Diagram and Typical Application
Figure 9-1.
DC/DC Typical Application Diagram
L = 10 μH
in
lx
Push
ref
Schottky
Diode
DC
Cell
0.9V - 1.8V
Button
Digital
Control
fb
Vout
on/off
gndsw1s
22 μF
Current
DC/DC
Control
gndsw1
0.1 Ohms
28
AT73C209
6365A–PMAAC–12-Mar-08
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