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参数资料
| 型号： | LTC4360ISC8-2#TRMPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MO-203BA, SC-70, 8 PIN |
| 文件页数： | 12/14页 |
| 文件大小： | 1370K |
| 代理商： | LTC4360ISC8-2#TRMPBF |
LTC4360-1/LTC4360-2
7
436012fa
Figure 2 details PWRGD behavior for a LTC4360-1 with
1k pull-up to 5V at PWRGD.
APPLICATIONS INFORMATION
The GATE ramp rate is limited to 3V/ms. VOUT follows at
a similar rate which results in an inrush current into the
load capacitor COUT of:
IINRUSH =COUT
dVGATE
dt
= COUT 3 mA/F
[
]
The servo loop is compensated by the parasitic capaci-
tance of the external MOSFET. No further compensation
components are normally required. In the case where the
parasiticcapacitanceislessthan100pF,a100pFcompensa-
tion capacitor between GATE and ground may be required.
An even slower GATE ramp and lower inrush current can
be achieved by connecting an external capacitor, CG, from
GATE to ground. The voltage at GATE then ramps up with a
slopeequalto10A/CG[V/s].ChooseCGusingtheformula:
CG =
10A
IINRUSH
COUT
Overvoltage
When power is first applied, VIN must remain below 5.7V
(VIN(OV) – VOV) for more than 130ms before GATE is
ramped up to turn on the MOSFET. If VIN then rises above
5.8V (VIN(OV)), the overvoltage comparator activates the
30mA fast pull-down on GATE within 1s. After an over-
voltage condition, the MOSFET is held off until VIN once
again remains below 5.7V for 130ms.
PWRGD Output
PWRGD is an active low output with a MOSFET pull-
down to ground and a 500k resistive pull-up to OUT. The
PWRGD pin pull-down releases during the low current
sleep mode (invoked by ON high), UVLO or overvolt-
age and the subsequent 130ms start-up delay. After the
start-up delay, GATE starts its slow ramp-up and control
of the PWRGD pull-down passes on to the GATE high
comparator. VGATE>VGATE(TH)formorethan65msasserts
the PWRGD pull-down and VGATE < VGATE(TH) releases
the pull-down. The PWRGD pull-down is capable of sink-
ing up to 3mA of current allowing it to drive an optional
LED. To interface PWRGD to another I/O rail, connect a
resistor from PWRGD to the I/O rail with a resistance
low enough to override the internal 500k pull-up to OUT.
Figure 2. PWRGD Behavior
IN
OUT
GATE
ON
PWRGD
VGATE(TH)
VIN(UVL)
VIN(OV)–VOV
START-UP
FROM UVLO
RESTART
FROM OV
OV
RESTART
FROM ON
ON
130ms
65ms
130ms
65ms
130ms
65ms
VIN(OV)
VGATE(TH)
ON Input (LTC4360-1)
ON is a CMOS compatible, active low enable input. It
has a default 5A pull-down to ground. Connect this
pin to ground or leave open to enable normal device
operation. If it is driven high while the external MOSFET
is turned on, GATE is pulled low with a weak pull-down
current (40A) to turn off the external MOSFET gradually,
minimizing input voltage transients. The LTC4360-1 then
goes into a low current sleep mode, drawing only 1.5A
at IN. When ON goes back low, the part restarts with a
130ms delay cycle.
GATEP Control (LTC4360-2)
GATEP has a 2M resistive pull-down to ground and a 5.8V
Zener clamp in series with a 200k resistor to IN. It con-
trols the gate of an optional external P-channel MOSFET
to provide negative voltage protection. The 2M resistive
pull-down turns on the MOSFET once VIN – VGATEP is
more than the MOSFET gate threshold voltage. The IN to
GATEP Zener protects the MOSFET from gate overvoltage
by clamping its VGS to 5.8V when VIN goes high.
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相关代理商/技术参数 |
参数描述 |
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| LTC4361CDC-1#PBF | 制造商:Linear Technology 功能描述:Bulk |
| LTC4361CDC-1#TRMPBF | 功能描述:IC OVERVOLTAGE/CUR PROT 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4361CDC-1#TRPBF | 功能描述:IC CTLR OVP LATCHOFF 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4361CDC-2#PBF | 制造商:Linear Technology 功能描述:Bulk |
| LTC4361CDC-2#TRMPBF | 功能描述:IC OVERVOLTAGE/CUR PROT 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
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