MIC5011
Micrel
MIC5011
Minimum Parts High- or Low-Side MOSFET Driver
General Description
The MIC5011 is the 鈥渕inimum parts count鈥?member of the
Micrel MIC501X driver family. These ICs are designed to
drive the gate of an N-channel power MOSFET above the
supply rail in high-side power switch applications. The 8-pin
MIC5011 is extremely easy to use, requiring only a power
FET and nominal supply decoupling to implement either a
high- or low-side switch.
The MIC5011 charges a 1nF load in 60碌s typical with no
external components. Faster switching is achieved by add-
ing two 1nF charge pump capacitors. Operation down to
4.75V allows the MIC5011 to drive standard MOSFETs in
5V low-side applications by boosting the gate voltage
above the logic supply. In addition, multiple paralleled
MOSFETs can be driven by a single MIC5011 for ultra-high
current applications.
Other members of the Micrel driver family include the
MIC5012 dual driver and MIC5013 protected 8-pin driver.
Features
鈥?4.75V to 32V operation
鈥?Less than 1碌A standby current in the 鈥渙ff鈥?state
鈥?Internal charge pump to drive the gate of an N-channel
power FET above supply
鈥?Available in small outline SOIC packages
鈥?Internal zener clamp for gate protection
鈥?Minimum external parts count
鈥?Can be used to boost drive to low-side power FETs
operating on logic supplies
鈥?25碌s typical turn-on time with optional external
capacitors
鈥?Implements high- or low-side drivers
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Lamp drivers
Relay and solenoid drivers
Heater switching
Power bus switching
For new designs, Micrel recommends the pin-compatible
MIC5014 MOSFET driver.
Typical Applications
14.4V
ON
10碌F
+
Ordering Information
Part Number
MIC5011BN
MIC5011BM
Temp. Range
鈥?0掳C to +85掳C
鈥?0掳C to +85掳C
Package
8-pin Plastic DIP
8-pin SOIC
MIC5011
1 V+
C1 8
2 Input
Com 7
3 Source
C2 6
4 Gnd
Gate 5
Control Input
IRF531
OFF
#6014
Figure 1. High Side Driver
Note: The MIC5011 is ESD sensitive.
5V
ON
10碌F
+
48V
MIC5011
1 V+
C1 8
100W
Heater
IRF530
2 Input
Com 7
3 Source
C2 6
4 Gnd
Gate 5
Control Input
OFF
Protected under one or more of the following Micrel patents:
patent #4,951,101; patent #4,914,546
Figure 2. Low Side Driver
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
July 2000
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