MIC5021BN Micrel Inc, MIC5021BN Datasheet - Page 2

• Manufacturer Part Number: MIC5021BN
• Description: IC DRIVER MOSFET HI SIDE HS 8DIP
• Manufacturer: Micrel Inc

Specifications of MIC5021BN

• Configuration: High-Side
• Input Type: Non-Inverting
• Delay Time: 500ns
• Number Of Configurations: 1
• Number Of Outputs: 1
• Voltage - Supply: 12 V ~ 36 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Peak: -
• High Side Voltage - Max (bootstrap): -

MIC5021
Pin Configuration
Block Diagram
Pin Description
MIC5021
Pin Number
1
2
3
4
5
6
7
8
Sense+
Sense-
Transistor: 106
Input
6V Internal Regulator
Pin Name
50mV
Sense +
Sense –
V
C
Input
Gate
BOOST
V
Gnd
INT
C
DD
2I
T
I
1
1
1
2
3
4
DIP Package
Input
C
Gnd
V
T
DD
(N)
V
Sense-
Sense+
B OOS T
Pin Function
Supply: +12V to +36V. Decouple with ≥ 10µF capacitor.
TTL Compatible Input: Logic high turns the external MOSFET on. An inter-
nal pull-down returns an open pin to logic low.
Retry Timing Capacitor: Controls the off time (t
retry cycle. (Duty cycle adjustment.)
• Open = approx. 20% duty cycle.
• Capacitor to Ground = approx. 20% to < 1% duty cycle.
• Pull-up resistor = approx. 20% to approx. 75% duty cycle.
• Ground = maintained shutdown upon overcurrent condition.
Circuit Ground
Current Sense Comparator (+) Input: Connect to high side of sense resistor
or current sensing MOSFET sense lead. A built-in offset in conjunction with
R
Current Sense Comparator (–) Input: Connect to the low side of the sense
resistor (usually the high side of the load).
Gate Drive: Drives the gate of an external power MOSFET. Also limits V
to 15V max. to prevent Gate-to-Source damage. Will sink and source cur-
rent.
Charge Pump Boost Capacitor: A bootstrap capacitor from V
FET source pin supplies charge to quickly enhance the Gate output during
turn-on.
Gate
SENSE
↑
↓
SHOT
ONE-
8
7
6
5
sets the load overcurrent trip point.
2
Fault
Normal
1
2
3
4
SOIC Package
Q1
10I
V
Input
C
Gnd
2
DD
T
(M)
I
V
Sense-
Sense+
2
B OOS T
Gate
ON
OFF
6V
8
7
6
5
C H A R G E
PUM P
G(OFF)
15V
C
V
V
Gate
T
DD
B OOS T
) of the overcurrent
BOOST
to the
Micrel, Inc.
July 2005
GS