MIC5031
Micrel
MIC5031
High-Speed High-Side MOSFET Driver
Not Recommended for New Designs
General Description
The MIC5031 MOSFET driver is designed to switch an
N-channel enhancement-type MOSFET from a TTL control
signal in a high-side switch application. The MIC5031 pro-
vides overcurrent protection, can accommodate loads with
high-inrush current, and is designed to survive automotive
power disturbances. This driver is suitable for up to 30kHz
PWM operation with 0% to 100% duty cycle.
The MIC5031 is powered by the +4.5V to +30V load voltage.
An external bootstrap capacitor and internal charge pump
drive the gate output higher than the supply voltage. The
bootstrap capacitor provides speed, while the charge pump
can sustain the high gate output voltage continuously.
The MIC5031 features a resistor programmable overcurrent
shutdown (circuit breaker) function that monitors the voltage
drop across the external MOSFET. A capacitor program-
mable shutdown delay allows a high-inrush current load to be
energized without causing undesired shutdown. An open-
load detection feature is included and can be used by adding
an external high-value resistor.
The MIC5031 is protected against automotive load dump and
reverse battery conditions. The driver is also protected from
excessive power dissipation by an internal overtemperature
shutdown circuit.
An open-collector fault flag output indicates overcurrent,
overtemperature, or open-load fault conditions.
Features
鈥?+4.5V to +30V operation
鈥?Fast gate drive
(rise time = 70ns, fall time = 50ns,
with 1000pF load and 5V supply)
鈥?Overcurrent detection across MOSFET
鈥?Overcurrent shutdown delay
鈥?Charge pump for high-side dc applications
鈥?TTL compatible input
鈥?Overtemperature shutdown
鈥?Automotive load dump protection
鈥?Reverse battery protection
鈥?Open-collector fault flag
鈥?Near zero-current disable state
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Automotive power switch
Automotive PWM control
Circuit breaker
PWM circuits
Ordering Information
Part Number
MIC5031BM
Temperature Range
鈥?0掳C to +85掳C
Package
16-lead SOIC
Typical Application
+4.5V to +30V
100碌F
100nF
10k
搂
0.01碌F
搂
Enable
Disable
On
Off
4
3
10
8
11
9
5
51k
MIC5031
7
VDD
EN
CTL
CP1+
CP1鈥?/div>
CP2+
CP2鈥?/div>
GND
FLG
RV
G
CB
S
RI
CS
DLY
1
14
16
12
13
15
6
2
Normal
Fault
1k*
IRF540
0.1碌F
100k
鈥?/div>
0.01碌F
0.01碌F
0.1碌F
50pF
鈥?/div>
12k* M
2N5822
15碌F
* Sets Overcurrent Trip to MOSFET V
DS
鈮?/div>
102mV
鈥?/div>
Optional Resistor for Open-Load Detection
鈥?/div>
Optional Capacitor for Overcurrent Delay
搂
Optional Resistor and Capacitor for Power-up Sequence
High-Side Power Switch and Circuit Breaker
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
August 1999
1
MIC5031
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