MIC5022(1999) Ver la hoja de datos (PDF) - Micrel
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MIC5022 Datasheet PDF : 9 Pages
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MIC5022
Pin Configuration
1 VDD
2 Input
VBOOST 14
Gate H 13
3 Fault Sense H– 12
4 CTH Sense H+ 11
5 Enable Gate L 10
6 CTL
7 Gnd
Sense L– 9
Sense L+ 8
1 VDD
2 NC
3 Input
NC 16
VBOOST 15
Gate H 14
4 Fault Sense H– 13
5 CTH Sense H+ 12
6 Enable Gate L 11
7 CTL Sense L– 10
8 Gnd Sense L+ 9
Micrel
Pin Description
DIP Pin No.
1
2
SOIC Pin No.
1
3
3
4
4
5
5
6
6
7
7
8
8
8
9
10
10
11
11
12
12
13
13
14
14
15
DIP Package
(N)
SOIC Package
(WM)
Pin Name
VDD
Input
Fault
CTH
Enable
CTL
Gnd
Sense L +
Sense L –
Gate L
Sense H +
Source H –
Gate H
VBOOST
Pin Function
Supply: +12V to +36V. Decouple with ≥ 10µF capacitor.
TTL Compatible Input: Logic high turns the high-side external MOSFET on
and the low-side external MOSFET off. Logic low turns the high-side
external MOSFET off and the low-side external MOSFET on. An internal
pull-down returns an open pin to logic low.
When either sense voltage exceeds threshold, open collector output is open
circuit for 5µs (tG(ON)), then pulled low for tG(OFF). tG(OFF) is adjustable from
CT.
Retry Trimming Capacitor, High Side: Controls the off time (tG(OFF)) of the
overcurrent retry cycle. (Duty cycle adjustment.)
• Open = approx. 20% duty cycle.
• Capacitor to Ground = approx. 20% to < 1% duty cycle.
• Pullup resistor = approx. 20% to approx. 75% duty cycle.
• Ground = maintained shutdown upon overcurrent condition.
Output Enable: Disables operation of the output drivers; active high. An
internal pull-down returns an open pin to logic low.
Retry Trimming Capacitor, Low Side: Same function as CTH.
Circuit Ground
Current Sense Comparator (+) Input, Low Side: Connect to source of low-
side MOSFET. A built-in offset (nominal 50mV) in conjunction with RSENSE
sets the load overcurrent trip point.
Current Sense Comparator (–) Input, Low Side: Connect to the negative
side of the low-side sense resistor.
Gate Drive, Low Side: Drives the gate of an external power MOSFET. Also
limits VGS to 15V max. to prevent Gate to Source damage. Will sink and
source current.
Current Sense Comparator (+) Input, High Side: Connect to source of high-
side MOSFET. A built-in offset (nominal 50mV) in conjunction with RSENSE
sets the load overcurrent trip point.
Current Sense Comparator (–) Input, High Side: Connect to the negative
side of the high-side sense resistor.
Gate Drive, High Side: Drives the gate of an external power MOSFET. Also
limits VGS to 15V max. to prevent Gate to Source damage. Will sink and
source current.
Charge Pump Boost Capacitor: A bootstrap capacitor from VBOOST to the
MOSFET source pin supplies charge to quickly enhance the external
MOSFET’s gate .
September 1999
179
MIC5022
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