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參數(shù)資料
| 型號： | MAX5923EUP+T |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 444K |
| 描述： | IC HOT-SWAP SWITCH +60V 20-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | Simple Swapper™ |
| 類型： | 熱交換開關(guān) |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 是 |
| 電流限制： | 800mA |
| 電源電壓： | 16 V ~ 60 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 帶卷 (TR) |
+60V Simple Swapper Hot-Swap Switch
_______________________________________________________________________________________ 9
Digital Logic
VDIG is the input supply for the internal logic circuitry.
The logic input thresholds of EN, LATCH, and ZC_EN
are CMOS compatible and are determined by the volt-
age at VDIG, which can range from 1.65V to 5.5V. The
POK and FAULT outputs are open-drain. VDIG and all
logic inputs and outputs are referenced to DGND.
DGND is not connected to AGND_S internally and must
be connected externally at a single point in the system
to AGND_S. The maximum allowable difference in the
voltage between DGND and AGND is ?V.
Enable (EN)
EN is a logic input to enable MAX5923. Bringing EN low
halts all operations and turns off the internal power
MOSFET. When EN is high and the input voltage is
above the UVLO threshold, the MAX5923 begins oper-
ating. Enable is also used to unlatch the part after a
latched fault condition. This is done by toggling EN low
and high again after a fault condition.
Overcurrent Protection
The MAX5923 provides a sophisticated overcurrent pro-
tection circuitry to ensure the robust operation under out-
put current transient and current-fault conditions. The
current protection circuitry employs a Constant Current
Limit, a Current Foldback, and an Overcurrent Timeout.
The device monitors the voltage drop, V
SENSE
(V
SENSE
=
V
IN
- V
DRAIN
) in order to determine the load current.
Constant Current Limit
The MAX5923 monitors V
SENSE
at all times and regu-
lates the current through the power MOSFET as neces-
sary to keep V
SENSE
(max) to the current-limit sense
voltage (V
ILIM
= 212mV). The load-current limit, I
LIM
, is
programmed by the current-sense resistor, R
SENSE
,
connected from IN to DRAIN (I
LIM
= V
ILIM
/R
SENSE
).
When the load current is less than I
LIM
, the MOSFET is
fully on. When the load is trying to draw more than I
LIM
,
the OUT pin works like a constant current source, limit-
ing the output current to I
LIM
. If I
OUT
is greater than
I
LIM
for greater than the current-limit timeout, a current-
limit fault is generated and the power MOSFET is
turned off (see the Overcurrent Timeout and Fault
Management section).
Current Foldback
While in current-limit condition, the voltage at the OUT pin
drops. As the load resistance reduces (more loading), the
output voltage reduces accordingly to maintain a con-
stant load current. The power dissipation in the power
MOSFET is (V
DRAIN
- V
OUT
) ?I
LIM
. As the output voltage
drops lower, more power is dissipated across the power
MOSFET. To reduce this power dissipation, the MAX5923
offers a current foldback feature where it linearly reduces
the V
ILIM
value when V
OUT
drops below the OUT current-
limit foldback voltage (V
FBSTOP
= 18V). Figure 2 illus-
trates this current foldback limit behavior.
Overcurrent Timeout
The MAX5923 keeps track of the time it is in current limit.
An internal digital counter begins incrementing its count
at 1count/ms when V
SENSE
exceeds its limit (either V
ILIM
or V
ILIM
foldback in foldback mode). The counter is reset
to zero if the current falls back below the current limit.
When the cumulative count reaches 60, an overcurrent
fault is generated. After an overcurrent fault condition, the
switch is turned off and the FAULT signal goes low. This
overcurrent timeout enables the MAX5923 to operate in a
periodic overcurrent condition without causing a fault.
See Figure 3 for an example of periodic overcurrent con-
dition without causing a fault.
V
ILM
V
ILM
/3
V
FBSTART
(2V)
V
FBSTOP
(18V)
V
OUT
(V)
Figure 2. Current Foldback Characteristic
MAX5923
IN
UVLO
AGND
R1
R2
V
IN
= 16V TO 60V
Figure 1. Setting Undervoltage Lockout with an External
Resistive Divider
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| MAX5924AEUB | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5924AEUB+ | 功能描述:熱插拔功率分布 1-13.2V Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5924AEUB+T | 功能描述:熱插拔功率分布 1-13.2V Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5924AEUB-T | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5924BEUB | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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