參數(shù)資料
型號(hào)： AN32502A
英文描述： For Information·Communication - PDA
中文描述： 信息·通訊-掌上電腦
文件頁(yè)數(shù)： 31/45頁(yè)
文件大?。?/td> 574K
代理商： AN32502A
31
SDF00034AEB
AN32502A
Publication data: November 2002
Application Notes
1. Overview
This IC is a power management IC developed for Intel PXA250/ 210 and features as follows:
A single chip IC onto which to integrate ch.2 DC-DC converter, ch.3 LDO and an interface circuit for PXA250/210
Charging circuit for backup battery, boost DC-DC converter and back-up MOS switch are built in.
Built-in ch.5 general-use output and 1 input/2 outputs analog switch are built in.
A high efficient synchronous rectifier circuit is employed for DC-DC converter.
Power supply for PXA250/ 210 core can be controlled by software (I
2
C interface).
(Intel Reference Number: 278530-001 Core voltage changing sequence described on the document is available.)
Small-size high Pd leadless package adopted (HQFN-64)
2. Function overview
Ch.1 (Step-down DC-DC converter for CPU core)
Output voltage range: 0.5 V to 1.7 V to be set up with DAC (I
2
C)
Synchronous rectifier type
Maximum current : 600 mA
Operating frequency: 500 kHz
Ch.4 (Step-down DC-DC converter)
Output voltage range: 1.8 V to 3.3 V
Synchronous rectifier type 100% duty operation guaranteed
Maximum current : 500 mA
Operating frequency: 500 kHz
Ch.2, Ch.3, Ch.5 (LDO)
Output voltage range: 1.8 V to 3.3 V
Maximum current : 500 mA
Note) *: Maximum current conforms to a test circuit condition described on the specification.
1) DC-DC converter for backup (Boost circuit)
Output voltage: 3.2 V
Output current: 2 mA (typical) 10 mA (maximum)
Built-in output switch MOS (Automatic on/off by main power supply)
Built-in charger circuit for backup battery is built in.
2) Input/ output-related items
Input I
2
C interface Output
PWR_EN
TRIG
External reset input
PS
Analog switch input
nRESET
BAT_FLT
WAKEUP
General purpose output (Ch.5 I
2
C control)
Analog switch output
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