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参数资料
| 型号： | LTC1644IGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/24页 |
| 文件大小： | 447K |
| 描述： | IC CONTROLLER HOT SWAP 20-SSOP |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | CompactPCI? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，5V，±12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1644IGNTR |
LTC1644
11
1644f
APPLICATIO S I FOR ATIO
U
U
U
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 LTC1644 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 protects
the supplies from shorts, precharges the bus I/O pins during
insertion and extraction and monitors the supply voltages.
The LTC1644 is specifically designed for CPCI applica-
tions where the chip resides on the plug-in board.
LTC1644 Feature Summary
" Allows safe board insertion and removal from a CPCI
backplane.
" Controls all four CPCI supplies: 12V, 12V, 3.3V and 5V.
" Adjustable foldback current limit: an adjustable analog
current limit with a value that depends on the output
voltage. If the output is shorted to ground, the current
limit drops to keep power dissipation and supply glitches
to a minimum.
" 12V and 12V circuit breakers: if either supply remains
in current limit too long, the circuit breaker will trip, the
supplies are turned off and the FAULT pin is pulled low.
" Dual-level, adjustable 5V and 3.3V circuit breakers: if
either supply exceeds current limit for too long, the
circuit breaker will trip, the supplies will be turned off
and the FAULT pin will be asserted. In the event that
either supply exceeds 3 times the nominal current level,
all supplies will be turned off and the FAULT pin will be
asserted immediately.
" 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 adjustable using the TIMER
pin.
" 12V and 12V power switches on chip.
" PWRGD output: monitors the voltage status of the four
supply voltages.
" PCI_RST# combined on-chip with HEALTHY# to create
LOCAL_PCI_RST# output. If HEALTHY# deasserts,
LOCAL_PCI_RST# is asserted independent of
PCI_RST#.
" Precharge output: on-chip reference and amplifier pro-
vide 1V for biasing bus I/O connector pins during CPCI
card insertion and extraction.
" Space saving 20-pin SSOP package.
CPCI Power Requirements
CPCI systems usually require four power rails: 5V, 3.3V,
12V and 12V. The tolerance of the supplies as measured
at the components on the plug-in card is summarized in
Table 1.
Table 1. Compact PCI Power Specifications
SUPPLY
TOLERANCE
MAX RIPPLE (
P-P
)
5V
+5%/3%
50mV
3.3V
+5%/3%
50mV
12V
?%
240mV
12V
?%
240mV
t
OC
Overcurrent Fault Detect
t
SC
Short-Circuit Fault Detect
TI I G DIAGRA S U
W
V
5VSENSE
OR
V
3VSENSE
5V OR 3.3V
FALL TIME d 1祍
5V
IN
= 5V, 3V
IN
= 3.3V
FAULT
100mV
t
OC
1644 TD01
1644 TD02
V
5VSENSE
OR
V
3VSENSE
5V OR 3.3V
FAULT
200mV
t
SC
FALL TIME d 10ns
5V
IN
= 5V, 3V
IN
= 3.3V
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