MIC2168A_15 Datasheet, PDF (2/18 Pages) Micrel Semiconductor – 1MHz PWM Synchronous Buck-Control IC

Micrel, Inc.
Ordering Information
Part Number
MIC2168AYMM
Pin Configuration
Frequency
1MHz
MIC2168A
Junction Temperature Range
–40° to +125°C
Package
10-Pin MSOP Pb-Free
10-Pin MSOP (MM)
(Top View)
Pin Description
Pin Number
1
Pin Name
VIN
2
VDD
3
CS
4
COMP
5
FB
6
GND
7
LSD
8
VSW
9
HSD
10
BST
Pin Function
Supply Voltage (Input): 3V to 14.5V.
5V Internal Linear Regulator (Output): VDD is the external MOSFET gate drive supply voltage
and an internal supply bus for the IC. When VIN 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 synchronous MOSFET.
Switch (Return): High-side MOSFET driver return.
High-Side Drive (Output): High-current output-driver for the high-side MOSFET. When VIN is
between 3.0V to 5V, 2.5V threshold-rated MOSFETs should be used. At VIN > 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 VIN minus a diode drop.
April 22, 2015
2
Revision 3.0