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AMS2027 데이터시트(PDF) 3 Page - Advanced Monolithic Systems

부품명 AMS2027
상세설명  SINGLE POWER DISTRIBUTION SWITCH
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제조업체  ADMOS [Advanced Monolithic Systems]
홈페이지  http://www.advanced-monolithic.com
Logo ADMOS - Advanced Monolithic Systems

AMS2027 데이터시트(HTML) 3 Page - Advanced Monolithic Systems

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Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS2027
PIN FUNCTIONS
Pin Name
Pin No.
I / O
Description
Enable
/EN
1
I
Enable Input, Logic turns power switch on.
Ground
GND
3
I
Ground.
Input
IN
7
I
Power switch input, also supplies IC’s internal circuitry.
Error Flag
ERROR
2
O
Overcurrent, Over temperature, Logic output.
Output
OUT
6,8
O
Power switch output.
THERMAL
SENSE
IN
1.2V
REFERENCE
CHARGE
PUMP
UVLO
*
CS
GATE
DRIVER
CURRENT
LIMIT
POWER SWITCH
OUT
ERROR
FLAG
ENABLE
ERROR
GND
FUNCTIONAL DESCRIPTION
Power Switch
The power switch is an N-channel MOSFET with a maximum on-
state resistance of 140m
Ω (V
I(IN) = 5.0V, configured as a high-side
switch.
Charge Pump
An internal 100kHz charge pump supplies the power to the driver
circuit and provides the required voltage to pull the gate of the
MOSFET above the source. The charge pump requires very little
supply current and operates from input voltages as low as 3.3V.
Gate Driver
The driver controls the gate voltage of the power switch. The
driver incorporates circuitry that controls the rise and fall times of
the output voltage, as a result it limits large current surges and
reduces
the
associated
electromagnetic
interference
(EMI)
produced. The rise and fall times of the output voltage are
typically in the 2ms to 4ms range instead of the microsecond or
nanosecond range for a standard FET.
Enable
A logic high on the /EN input turns off the power switch and the
bias for the charge pump, driver, and other circuitry to reduce the
supply current to less than 10
µA. A logic zero input restore bias to
the drive and control circuits and turns the power on. The enable
input is compatible with both TTL and CMOS logic levels.
Error Flag
The error flag output, is an open drain logic output that is active
low when output current exceeds current limit. Until the fault
condition is removed the output will remain active low.
Current Limit
A sense FET monitors the current supplied to the load. In case of
an overload or short circuit, the current limit circuitry sends a
signal to the driver. The driver will then reduce the gate voltage
and drive the power FET into its linear region, which switches the
output into a constant current mode and holds the current constant
while varying the voltage on the load.
Thermal Shutdown
The internal thermal shutdown circuit will shut the power switch
off when the junction temperature rises to approx. 180°C.
Hysterisis is build into the thermal sense circuitry, and after the
junction temperature has dropped about 20°C, the switch turns
back on. Until the fault is removed the switch will continue to
cycle off and on.
Undervoltage Lock-out
An internal voltage sense monitors the input voltage. When the
input voltage is below 3.2V nominal, the switch is turned off by a
control signal. The typical fall time range due to the sense of a
low voltage is 250
µs to 750µs.
BLOCK DIAGRAM
*Current Sense


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