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参数资料
| 型号： | LTC1643HCGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件页数： | 14/16页 |
| 文件大小： | 278K |
| 代理商： | LTC1643HCGN#PBF |
7
LTC1643L/LTC1643L-1/LTC1643H
3VSENSE (Pin 10): The 3.3V Current Limit Set Pin. With a
sense resistor placed in the supply path between 3VIN and
3VSENSE, the GATE pin voltage will be adjusted to maintain
a constant voltage across the sense resistor and a con-
stant current through the switch. A foldback feature makes
the current limit decrease as the voltage at the 3VOUT pin
approaches GND. To disable the current limit, 3VSENSE
and 3VIN can be shorted together.
GATE (Pin 11): High Side Gate Drive for the External
N-Channel Pass Transistors. Requires an external series
RC network for the current limit loop compensation and
setting the minimum ramp-up rate. During power-up, the
slope of the voltage rise at the GATE is set by the 50
A
current source connected to 12VIN and the external ca-
pacitor connected to GND or by the 3.3V or 5V current limit
and the bulk capacitance on the 3VOUT or 5VOUT suppy
lines. During power-down, the slope of the falling voltage
is set by the 200
A current source connected to GND and
the external GATE capacitor.
The voltage at the GATE pin will be modulated to maintain
a constant current when either the 3V or 5V supplies go
into current limit. When a current limit fault occurs after
the inhibit period set by the TIMER pin capacitance, the
undervoltage lockout circuit on 3.3V, 5V or 12V trips or
the FAULT pin is pulled low, the GATE pin is immediately
pulled to GND.
5VSENSE (Pin 12): 5V Current Limit Set Pin. With a sense
resistor placed in the supply path between 5VIN and
5VSENSE, the GATE pin voltage will be adjusted to maintain
a constant voltage across the sense resistor and a con-
stant current through the switch. A foldback feature makes
the current limit decrease as the voltage at the 5VOUT pin
approaches GND. To disable the current limit, 5VSENSE
and 5VIN can be shorted together.
5VIN (Pin 13): Analog Input. Used to monitor the 5V input
supply voltage. An undervoltage lockout circuit prevents
the switches from turning on when the voltage at the 5VIN
pin is less than 2.5V typically.
5VOUT (Pin 14): Analog Input. Used to monitor the 5V
output supply voltage. The PWRGD signal cannot go high
until the 5VOUT pin exceeds 4.65V typically.
the ON pin pulled low, the GATE pin is pulled high by a
50
A current source and the internal 12V and –12V
switches are turned on. When the ON pin is pulled low or
the ON pin pulled high, the GATE pin will be pulled to
ground by a 200
A current source and the 12V and –12V
switches turned off.
The ON/ON pin is also used to reset the electronic circuit
breaker. If the ON/ON pin is cycled following the trip of the
circuit breaker, the circuit breaker is reset and a normal
power-up sequence will occur.
FAULT (Pin 6): Open-Drain Digital I/O. FAULT is pulled low
when a current limit fault is detected. Current limit faults
are ignored while the voltage at the TIMER pin is less than
12VIN – 0.9V. Once the TIMER cycle is complete, FAULT
will pull low typically 14.6
s after any of the supplies go
into current limit. At the same time, the GATE and TIMER
pins are pulled to GND and the 12V and –12V switches are
turned off. The chip will remain latched in the off state until
the ON/ON pin is toggled or the power is cycled.
Forcing the FAULT pin low with an external pull-down will
immediately turn off the internal switches and force the
GATE and TIMER pins to GND independent of the state of
the ON/ON pin. However, the chip is not latched into the off
state, so when the FAULT pin is released, the state of the
chip will be determined by the ON pin.
PWRGD (Pin 7): Open-Drain Digital Power-Good Output.
PWRGD remains low while V12VOUT ≥ 11.4V, V3VOUT ≥ 3V,
V5VOUT ≥ 4.75V and VEEOUT ≤ –10.8V. The LTC1643L-1
has the power good comparators connected to the 12VOUT
and VEEOUT pins disabled, with only the 3VOUT and 5VOUT
outputs being monitored to generate PWRGD. When one
of the supplies falls below its power-good threshold
voltage, PWRGD will go high after a 15
s deglitching time.
The switches will
not be turned off when PWRGD goes
high.
GND (Pin 8): Chip Ground.
3VIN (Pin 9): 3.3V Supply Sense Input. An undervoltage
lockout circuit prevents the switches from turning on
when the voltage at the 3VIN pin is less than 2.5V typically.
If no 3.3V input supply is available, tie 3VIN to the 5VIN pin.
PIN FUNCTIONS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1643L-1CGN | 制造商:Linear Technology 功能描述: |
| LTC1643LCGN | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:POWER CONTROL/MANAGEMENT, 16 Pin, Plastic, SSOP |
| LTC1643LCGN#PBF | 制造商:Linear Technology 功能描述:Hot Swap Controller 16-Pin SSOP N |
| LTC1644CGN | 功能描述:IC CONTROLLER HOT SWAP 20-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC1644CGN#PBF | 功能描述:IC CONTROLLER HOT SWAP 20-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
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