参数资料
型号: LTC1646IGN#PBF
厂商: Linear Technology
文件页数: 9/20页
文件大小: 407K
描述: IC CNTRLR HOTSWAP PCIDUAL 16SSOP
标准包装: 100
类型: 热交换控制器
应用: CompactPCI?
内部开关:
电源电压: 3.3V,5V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-SSOP
包装: 管件
LTC1646
9
1646fa
Hot Circuit Insertion
When a circuit board is inserted into a live CompactPCI
(CPCI) slot, the supply bypass capacitors on the board can
draw huge supply transient currents from the CPCI power
bus as they charge up. The transient currents can cause
glitches on the power bus, causing other boards in the
system to reset.
The LTC1646 is designed to turn a boards supply voltages
on and off in a controlled manner, allowing the board to be
safely inserted or removed from a live CPCI slot without
glitching the system power supplies. The chip also pro-
tects the supplies from shorts, precharges the bus I/O pins
during insertion and extraction and monitors the supply
voltages.
BLOCK DIAGRA
TIMER
2
3V
OUT
7
5V
OUT
5

+
+
Q2
Q3
200礎
13礎
GATE
5V
OUT
55mV
150mV
V
GG
10
5V
SENSE
11
5V
IN
12

+
+
+
2.5V
UVL

+
+

3V
OUT
55mV
150mV
C
P3
REF
3V
SENSE
9
3V
IN
8
RESETOUT
1

+

+
+

+

2.5V
UVL
Q4
1V
C
P4
REF

+

+
RESETIN
16
PWRGD
4
Q6
FAULT
3
Q7
OFF/ON
15
5礎
5V
in
GND
6
DRIVE
14
PRECHARGE
1646 BD
13
LOGIC
Q1
Q5
APPLICATIO  S I FOR  ATIO
U
U
U
The LTC1646 is specifically designed for CPCI applica-
tions where the chip resides on the plug-in board.
LTC1646 Feature Summary
1. Allows safe board insertion and removal from a CPCI
backplane.
2. Controls 5V and 3.3V CPCI supplies.
3. Current limit during power-up: the supplies are allowed
to power up in current limit. This allows the chip to
power up boards with widely varying capacitive loads
without tripping the circuit breaker. The maximum
allowable power-up time is programmable using the
TIMER pin and an external capacitor.
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