MIC2169 Micrel Semiconductor, MIC2169 Datasheet - Page 2

• Manufacturer Part Number: MIC2169
• Description: 500 KHZ PWM SYNCHRONOUS BUCK CONTROL IC
• Manufacturer: Micrel Semiconductor

MIC2169
Ordering Information
Pin Configuration
Pin Description
M9999-111803
Part Number
MIC2169BMM
Pin Number
10
1
2
3
4
5
6
7
8
9
Frequency
500kHz
COMP/EN
Pin Name
GND
VSW
VDD
HSD
LSD
BST
VIN
CS
FB
Junction Temp. Range
–40 C to +125 C
Pin Function
Supply Voltage (Input): 3V to 14.5V.
5V Internal Linear Regulator (Output): V
drive supply voltage and an internal supply bus for the IC. When V
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 (50 A 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
should be used. At V
Boost (Input): Provides the drive voltage for the high-side MOSFET driver.
The gate-drive voltage is higher than the source voltage by V
diode drop.
10-Pin MSOP (MM)
2
IN
IN
is between 3.0V to 5V, 2.5V threshold MOSFETs
> 5V, 5V threshold MOSFETs should be used.
10-lead MSOP
Package
DD
is the external MOSFET gate
IN
November 2003
minus a
IN
is <5V,
Micrel