MIC2168 Datasheet, PDF (2/14 Pages) Micrel Semiconductor – 1MHZ PWM SYNCHRONOUS BUCK CONTROL IC

MIC2168
Ordering Information
Part Number
MIC2168BMM
Frequency
1MHz
Junction Temp. Range
–40°C to +125°C
Package
10-lead MSOP
Pin Configuration
VIN 1
VDD 2
CS 3
COMP/EN 4
FB 5
10 BST
9 HSD
8 VSW
7 LSD
6 GND
10-Pin MSOP (MM)
Micrel
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
Pin Name
VIN
VDD
CS
COMP/EN
FB
GND
LSD
VSW
HSD
BST
Pin Function
Supply Voltage (Input): 3V to 14.5V.
5V Internal Linear Regulator (Output): V_DD is the external MOSFET gate
drive supply voltage and an internal supply bus for the IC. When V_IN is <5V,
this regulator operates in dropout mode.
Current Sense / Enable (Input): Current-limit comparator noninverting input.
The current limit is sensed across the MOSFET during the ON time. The
current can be set by the resistor in series with the CS pin.
Compensation (Input): Dual function pin. Pin for external compensation. If
this pin is pulled below 0.2V, with the reference fully up the device shuts
down (50µA typical current draw).
Feedback (Input): Input to error amplifier. Regulates error amplifier to 0.8V.
Ground (Return).
Low-Side Drive (Output): High-current driver output for external synchro-
nous MOSFET.
Switch (Return): High-side MOSFET driver return.
High-Side Drive (Output): High-current output-driver for the high-side
MOSFET. When V_IN is between 3.0V to 5V, 2.5V threshold-rated MOSFETs
should be used. At V_IN > 5V, 5V threshold MOSFETs should be used.
Boost (Input): Provides the drive voltage for the high-side MOSFET driver.
The gate-drive voltage is higher than the source voltage by V_IN minus a
diode drop.
M9999-111803
2
November 2003