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| 型号： | MAX5926EEE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/21页 |
| 文件大小： | 333K |
| 描述： | IC HOT-SWAP CONTROLLER 16QSOP-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 1 V ~ 13.2 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-LSSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
1V to 13.2V, n-Channel Hot-Swap Controllers
Require No Sense Resistor
______________________________________________________________________________________ 11
Detailed Description
The MAX5924/MAX5925/MAX5926 are hot-swap con-
troller ICs designed for applications where a line card is
inserted into a live backplane. Normally, when a line card
is plugged into a live backplane, the cards discharged
filter capacitors provide a low impedance that can
momentarily cause the main power supply to collapse.
The MAX5924/MAX5925/MAX5926 are designed to
reside either in the backplane or in the removable card
to provide inrush current limiting and short-circuit pro-
tection. This is achieved using an external n-channel
MOSFET and an optional external current-sense resistor.
Several critical parameters can be configured:
" Slew rate (inrush current)
" Circuit-breaker threshold
" Turn-on voltage
" Fault-management mode (MAX5926)
" Circuit-breaker temperature coefficient (MAX5926)
See the Selector Guide for a device-specific list of fac-
tory-preset features and parameters.
Startup Mode
It is important that both V
CC
and V
S
rise at a minimum
rate of 100mV/ms during the critical time when power
voltages are below those values required for proper
logic control of internal circuitry. This applies for 0.5V d
V
CC
d 2.5V and 0.5V d V
S
d 0.8V. This is particularly
true when LATCH is tied high.
The MAX5924/MAX5925/MAX5926 control an external
MOSFET placed in the positive power-supply pathway.
When power is first applied, the MAX5924/MAX5925/
MAX5926 hold the MOSFET off indefinitely if the supply
voltage is below the undervoltage lockout level or if the
device is disabled (see the EN (MAX5924/MAX5925),
EN1/EN2 (MAX5926) section). If neither of these condi-
tions exist, the device enters a UVLO startup delay
period for H200ms. Next, the MAX5924/MAX5925/
MAX5926 detect whether an external sense resistor is
present; and then autoconfigure accordingly (see
Figure 4).
" If no sense resistor is present, bilevel fault protection
is disabled and load-probing circuitry is enabled
(see the Load Probing section).
If load probing is not successful, the fault is man-
aged according to the selected fault management
mode (see the Latched and Auto-Retry Fault
Management section).
If load probing (see the Load Probing section) is suc-
cessful, slew-rate limiting is employed to gradually
turn on the MOSFET.
" If the device detects an external R
SENSE
, circuit-
breaker threshold is set at 2xI
CB
, the slow compara-
tor is disabled, the startup phase begins without
delay for load probing, and slew-rate limiting is
employed to gradually turn on the MOSFET.
During the startup phase, the voltage at the load, V
OUT
,
rises at a rate determined by the selected slew rate (see
the Slew Rate section). The inrush current, I
INRUSH
, to
the load is limited to a level proportional to the load
capacitance, C
L
, and the slew rate:
where SR is the slew rate in V/ms and C
L
is load capac-
itance in 礔.
For operation with and without R
SENSE
, once V
GATE
-
V
OUT
exceeds V
CB,EN
, PGOOD and/or PGOOD
assert. When V
GATE
- V
OUT
= V
CB,EN
, the MAX5924/
MAX5925/MAX5926 enable standard bilevel fault pro-
tection with normal I
CB
(see the Bilevel Fault Protection
section).
I
C SR
INRUSH
L
=
?/DIV>
1000
V
CC
RISES ABOVE V
UVLO
ENABLE TRUE?
UVLO 200ms DELAY
V
GS
e V
THPGOOD
FAULT MANAGEMENT
DISABLE FAULT PROTECTION,
ENABLE LOAD PROBE
SLEW-RATE-LIMITED
STARTUP
RSENSE
PRESENT?
VGS e VCB,EN
NO
NO
NO
PGOOD
YES
NO
YES
YES
YES
LOAD PROBE
SUCCESSFUL?
ENABLE STANDARD BILEVEL
FAULT PROTECTION
BEGIN NORMAL OPERATION
I
CB,SU
= 2 x I
CB
DISABLE SLOW
COMPARATOR
Figure 4. Startup Flow Chart
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相关代理商/技术参数 |
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|---|---|
| MAX5926EVKIT | 制造商:Maxim Integrated Products 功能描述:1V TO 13.2V N-CHANNEL HOT-SWAP CON - Rail/Tube |
| MAX5927AETJ+ | 功能描述:热插拔功率分布 Quad Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5927AETJ+T | 功能描述:热插拔功率分布 Quad Hot-Swap Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5927ETJ | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5927ETJ+ | 功能描述:热插拔功率分布 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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