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參數資料
| 型號： | MAX5938LEEE+ |
| 廠商： | Maxim Integrated |
| 文件頁數： | 7/26頁 |
| 文件大?。?/td> | 915K |
| 描述： | IC HOT-SWAP CTRLR -48V 16-QSOP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 100 |
| 類型： | 熱交換控制器 |
| 應用： | 通用 |
| 內部開關： | 無 |
| 電源電壓： | -10 V ~ -80 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-QSOP |
| 包裝： | 管件 |
-48V Hot-Swap Controller with V
IN
Step Immunity,
No R
SENSE
, and Overvoltage Protection
_______________________________________________________________________________________ 7
Detailed Description
The MAX5938 hot-swap controller incorporates over-
current and overvoltage fault management and is
intended for negative-supply-rail applications. The
MAX5938 eliminates the need for an external R
SENSE
and includes V
IN
input step protection and load probe,
which prevents powering up into a shorted load. It is
intended for negative 48V telecom power systems
where low cost, flexibility, multifault management, and
compact size are required. The MAX5938 is ideal for
the widest range of systems from those requiring low
current with small MOSFETs to high-current systems
requiring large power MOSFETs and low on-resistance.
The MAX5938 controls an external n-channel power
MOSFET placed in the negative supply path of an
external load. When no power is applied, the GATE out-
put of the MAX5938 clamps the V
GS
of the MOSFET to 2V
keeping the MOSFET turned off (Figure 2). When power
is applied to the MAX5938, the 2V clamp at the GATE
output is replaced by a strong pulldown device, which
pulls GATE to V
EE
and the V
GS
of the MOSFET to 0.
As shown in Figure 2, this transition enables the
MAX5938 to keep the power MOSFET continually off
during the board insertion phase when the circuit board
first makes contact with the backplane. Without this
clamp, the GATE output of a powered-down controller
would be floating and the MOSFET reverse transfer
PIN
NAME
FUNCTION
1
GND
Ground. The high supply connection for a negative rail hot-swap controller.
2, 10,
1 1
N.C.
No Connection. Not internally connected. Leave open.
3
OFF
Off Control Input. Referenced to V
EE
. Drive OFF and ON above 1.25V (typ) to turn on the MAX5938. When the
ON input low requirements are met and OFF falls below 1.25V (typ), the MAX5938 turns off.
4
ON
On Control Input. Referenced to V
EE
. Drive ON and OFF above the 1.25V rising thresholds to turn on the
MAX5938. When the voltage at OFF falls below its 1.25V (typ) threshold and the voltage at ON falls below
1.125V for longer than the ON 1.5ms glitch rejection period, the MAX5938 turns off.
5
OV
Overvoltage Control Input. Referenced to V
EE
. When the voltage at OV rises above the 1.25V rising threshold,
GATE pulls to V
EE
until OV falls below the 1.125V falling threshold. If the overvoltage condition remains longer
than 1.5ms, fault management initiates and PGOOD deasserts (see the Detailed Description).
6
STEP_MON
Input Voltage Step Monitor. Connect a resistor between STEP_MON and V
EE
to set the step sensitivity.
Connect a capacitor from GND to STEP_MON to adjust the step response relative to a negative step at V
EE
to
eliminate false circuit-breaker and short-circuit faults. Connect to V
EE
to disable the step immunity function.
See the Selecting Resistor and Capacitor Values for Step Monitor section in the Applications Information.
7
POL_SEL
PGOOD Output Polarity Select. Leave POL_SEL open for an active-low PGOOD assertion. Connect POL_SEL
to V
EE
for an active-high open-drain PGOOD assertion.
8
V
EE
Negative Input Voltage
9
LP
Load-Probe Detect. Connect a resistor from LP to V
OUT
to set the load-probe test current. Limit load-probe
test current to 1A. Connect to V
EE
to disable load-probe function.
11
GATE
Gate-Drive Output. Connect to the gate of the external n-channel MOSFET.
12
CB_ADJ
Circuit-Breaker Adjust. Connect a resistor from CB_ADJ to V
EE
to adjust the circuit-breaker threshold. Short
CB_ADJ to V
EE
for the default circuit-breaker 50mV (typ) threshold. Leave CB_ADJ open to disable circuit-
breaker and short-circuit fault detection.
14
V
OUT
Output Voltage Sense. V
OUT
is the negative rail of the load. Connect to the drain of the external n-channel
MOSFET.
16
PGOOD
Power-Good Open-Drain Output. Referenced to V
OUT
. PGOOD asserts high (POL_SEL = V
EE
) or low
(POL_SEL open) when V
OUT
is within limits and there is no fault condition. PGOOD is deasserted when
ON and OFF are cycled low.
Pin Description
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX5938LEEE+ | 功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5938LEEE+T | 功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5938LEEE-T | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5939AESA | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5939AESA+ | 功能描述:熱插拔功率分布 48V- Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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