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参数资料
| 型号： | MAX1562HESA |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | AC MEXICO |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 0.150 INCH, MS-012AA, SO-8 |
| 文件页数： | 8/12页 |
| 文件大小： | 436K |
| 代理商： | MAX1562HESA |
M
For the MAX1563, the minimum R
ISET
value is 4.22k
,
corresponding to a 4A current limit. Set the continuous
current-limit value 20% to 30% higher than the expect-
ed load current to ensure that normal conditions do not
trigger nuisance fault outputs. The short-circuit current
limit is internally set to 1.3 times the continuous current-
limit setting.
On/Off Control and UVLO
The MAX1562 has an active-low
ON
polarity and the
MAX1562H has an active-high ON polarity. SEL sets the
active polarity of the MAX1563. Connect ON to the same
voltage as SEL to enable OUT. Connect ON to the
opposite voltage as SEL to disable OUT (see Table 1).
The MAX1562/MAX1562H/MAX1563 include a UVLO
circuit to prevent erroneous switch operation when the
input voltage goes low during startup and brownout
conditions. Input voltages of less than +3.4V inhibit
operation of the device.
FAULT
asserts low during a
UVLO condition.
Output Fault Protection and Autoreset
The MAX1562/MAX1562H/MAX1563 sense the switch
output voltage and select continuous current limiting for
V
OUT
greater than 1V or short-circuit current limiting for
V
OUT
less than 1V. When V
OUT
is greater than 1V, the
device operates in a continuous current-limit mode that
limits output current to the programmed current limit
(1A to 4A). When V
OUT
is less than 1V, the device oper-
ates in short-circuit current-limit mode, sourcing a
pulsed current to the load. The pulse current depends
on the programmed current-limit value, typically 30%
higher than the programmed current limit.
When either fault condition persists for 20ms, the output
turns off and the fault flag asserts. The output automati-
cally restarts when the short or overload is removed. Note
that during severe short conditions,
FAULT
does not wait
20ms but goes low immediately since there is typically
also an undervoltage transient during a severe short.
The MAX1562/MAX1562H/MAX1563 detect short-circuit
removal by sourcing 25mA from the output and monitor-
ing the output voltage. When the voltage at the output
exceeds +0.5V for 20ms, the fault flag resets, the output
turns back on, and the 25mA current source turns off.
Thermal Shutdown
When the MAX1562/MAX1562H/MAX1563 die tempera-
ture exceeds +160
°
C, the switch turns off and
FAULT
goes low. Thermal shutdown does not utilize the 20ms
fault-blanking timeout period. When the junction tem-
perature cools by 15
°
C, the switch turns on again and
FAULT
returns high. The switch cycles on and off if an
overload condition persists, resulting in a pulsed output
that reduces the average system load.
Fault Indicators
The MAX1562/MAX1562H/MAX1563 provide an open-
drain fault output,
FAULT
. Connect
FAULT
to IN through
a 100k
pullup resistor for most applications.
FAULT
asserts low when any of the following conditions occur:
The input voltage is below the UVLO threshold.
The switch junction temperature exceeds the +160
°
C
thermal-shutdown temperature limit.
The switch is in current-limit or short-circuit current-
limit mode for more than 20ms.
The
FAULT
output deasserts after a 20ms delay once the
fault condition is removed. Ensure that the MAX1562/
MAX1562H/MAX1563 input bypass capacitance is suffi-
ciently large to prevent load glitches from triggering the
FAULT
output. Limit the input-voltage slew rate to
0.2V/μs to prevent erroneous
FAULT
indications.
To differentiate large capacitive loads from short circuits
or sustained overloads, the switches have a fault-blank-
ing circuit. When a load transient causes the device to
enter current limit, an internal counter monitors the dura-
tion of the fault. For load faults exceeding the 20ms
fault-blanking time, the switch turns off,
FAULT
asserts
low, and the device enters autoreset mode (see the
Output Fault Protection and Autoreset
section). Only
current-limit and short-circuit faults are blanked. If ther-
mal-overload faults or the input voltage drops below the
UVLO threshold, the switch turns off and asserts
FAULT
low immediately. Note that during severe short condi-
tions,
FAULT
goes low immediately since there is typi-
cally also a brief undervoltage transient.
Fault blanking allows the MAX1562/MAX1562H/
MAX1563 to handle USB loads that might not be fully
compliant with the USB specifications. These switches
successfully power USB loads with additional bypass
capacitance and/or large startup currents while pro-
tecting the upstream power source. No fault is reported
if the switch brings up the load within the 20ms blank-
ing period. See Table 2 for a summary of current-limit
and fault behavior.
Programmable 4A USB Current-Limited
Switches with Autoreset and Fault Blanking
8
_______________________________________________________________________________________
Table 1. On/Off Control
SEL
ON
GND
V
IN
GND
V
IN
OUT BEHAVIOR
ON
OFF
OFF
ON
GND
V
IN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1562HESA+ | 功能描述:电源开关 IC - USB 4A USB Crnt-Limited w/Autoreset RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1562HESA+T | 功能描述:电源开关 IC - USB 4A USB Crnt-Limited w/Autoreset RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1562HESA-T | 功能描述:电源开关 IC - USB 4A USB Crnt-Limited w/Autoreset RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1563ETC | 功能描述:电源开关 IC - USB 4A USB Crnt-Limited w/Autoreset RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1563ETC+ | 功能描述:电源开关 IC - USB 4A USB Crnt-Limited w/Autoreset RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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