MICREL MIC5022 Datasheet
MIC5022 Micrel
MIC5022
Half-Bridge MOSFET Driver
General Description
The MIC5022 half-bridge MOSFET driver is designed to
operate at frequencies up to 100kHz (5kHz PWM for 2% to
100% duty cycle) and is an ideal choice for high speed
applications such as motor control and SMPS (switch mode
power supplies).
A rising or falling edge on the input results in a current source
pulse or sink pulse on the gate outputs. This output current
pulse can turn on a 2000pF MOSFET in approximately 1µs.
The MIC5022 then supplies a limited current (< 2mA), if
necessary, to maintain the output states.
Two overcurrent comparators with nominal trip voltages of
50mV make the MIC5022 ideal for use with current sensing
MOSFETs. External low value resistors may be used instead
of sensing MOSFETs for more precise overcurrent control.
Optional external capacitors placed on the C
may be used to individually control the current shutdown duty
cycles from approximately 20% to <1%. Duty cycles from
20% to about 75% are possible with individual pull-up resistors from CTL and CTH to VDD. An open collector output
provides a fault indication when either sense input is tripped.
The MIC5022 is available in 16-pin wide SOIC and 14-pin
plastic DIP packages.
Other members of the MIC502x family include the MIC5020
low-side driver and the MIC5021 high-side driver.
and CTL pins
TH
Features
• 12V to 36V operation
• 600ns rise time into 1000pF (high side)
• TTL compatible input with internal pull-down resistor
• Outputs interlocked to prevent cross conduction
• TTL compatible enable
• Fault output indication
• Individual overcurrent limits
• Gate protection
• Internal charge pump (high-side)
• Current source drive scheme reduces EMI
Applications
• Motor control
• Switch-mode power supplies
Ordering Information
Part Number Temperature Range Package
MIC5022BWM –40°C to +85°C 16-pin Wide SOIC
MIC5022BN –40°C to +85°C 14-pin Plastic DIP
Typical Application
TTL Input
PWM signal)
MIC5022
1
V
2
3
4
5
6
7
DD
Input
Fault
C
TH
Enable
C
TL
Gnd
10µF
C
TH
C
TL
V
BOOST
Gate H
Sense H–
Sense H+
Gate L
Sense L–
Sense L+
DC Motor Control Application
+12V to +36V
14
13
12
11
10
9
8
R
R
2.7nF
S1
M
S2
MIC5022 178 September 1999
MIC5022 Micrel
Pin Configuration
114
V
DD
2
Input
3
Fault
V
BOOST
Gate H
Sense H–
13
12
1
V
DD
2
NC
3
Input
NC
V
BOOST
Gate H
16
15
14
4
5
6
7
C
TH
Enable
C
TL
Gnd
Sense H+
Gate L
Sense L–
Sense L+
11
10
4
Fault
Sense H–
5
C
Sense H+
TH
8
6
7
Enable
C
TL
Gnd
Sense L–
Sense L+
9
8
Gate L
13
12
11
10
9
DIP Package SOIC Package
(N) (WM)
Pin Description
DIP Pin No. SOIC Pin No. Pin Name Pin Function
11VDDSupply: +12V to +36V. Decouple with ≥ 10µF capacitor.
2 3 Input 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.
3 4 Fault When either sense voltage exceeds threshold, open collector output is open
circuit for 5µs (t
CT.
45C
TH
Retry Trimming Capacitor, High Side: Controls the off time (t
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.
5 6 Enable Output Enable: Disables operation of the output drivers; active high. An
internal pull-down returns an open pin to logic low.
67CTLRetry Trimming Capacitor, Low Side: Same function as CTH.
7 8 Gnd Circuit Ground
8 8 Sense L + Current Sense Comparator (+) Input, Low Side: Connect to source of low-
side MOSFET. A built-in offset (nominal 50mV) in conjunction with R
sets the load overcurrent trip point.
9 10 Sense L – Current Sense Comparator (–) Input, Low Side: Connect to the negative
side of the low-side sense resistor.
10 11 Gate L 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.
11 12 Sense H + Current Sense Comparator (+) Input, High Side: Connect to source of high-
side MOSFET. A built-in offset (nominal 50mV) in conjunction with R
sets the load overcurrent trip point.
12 13 Source H – Current Sense Comparator (–) Input, High Side: Connect to the negative
side of the high-side sense resistor.
13 14 Gate H 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.
14 15 V
BOOST
Charge Pump Boost Capacitor: A bootstrap capacitor from V
MOSFET source pin supplies charge to quickly enhance the external
MOSFET’s gate .
), then pulled low for t
G(ON)
G(OFF)
. t
is adjustable from
G(OFF)
G(OFF)
BOOST
) of the
SENSE
SENSE
to the
September 1999 179 MIC5022
MIC5022 Micrel
Block Diagram
6V Internal Regulator
I
Sense H+
Sense H–
50mV
15V
1
C
INT
2I
1
1.4V
Fault
Normal
Q1
CHARGE
PUMP
C
V
V
TH
DD
BOOST
Input
Sense L+
Sense L–
Enable
50mV
ON
OFF
↑
ONE-
SHOT
↓
6V
I
1
C
INT
2I
1
1.4V
15V
↑
↓
ONE-
SHOT
Fault
Normal
Q1
10I
10I
I
2
I
2
6V
2
ON
OFF
6V
2
Gate H
C
TL
Fault
V
DD
Gate L
Transistor Count: 188
Absolute Maximum Ratings
Supply Voltage (VDD) ..................................................+40V
Input Voltage .................................................. –0.5V to 15V
Sense Differential Voltage..........................................±6.5V
Sense + or Sense – to Gnd.......................... –0.5V to +36V
Operating Ratings
Supply Voltage (VDD) ....................................+12V to +36V
Temperature Range
SOIC ...................................................... –40°C to +85°C
PDIP....................................................... –40°C to +85°C
Fault Voltage ...............................................................+36V
Current into Fault .......................................................50mA
Timer Voltage (CT) .....................................................+5.5V
V
Capacitor .................................................... 0.01µF
BOOST
MIC5022 180 September 1999
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