MIC2176-1 MICREL [Micrel Semiconductor], MIC2176-1 Datasheet - Page 2

• Manufacturer Part Number: MIC2176-1
• Description: Wide Input Voltage, Synchronous Buck Controllers Featuring Adaptive On-Time Control
• Manufacturer: MICREL [Micrel Semiconductor]

Micrel, Inc.
Ordering Information
Pin Configuration
Pin Description
Part Number
MIC2176-1YMM
MIC2176-2YMM
MIC2176-3YMM
November 2010
Number
Pin
1
2
3
4
5
6
7
8
Pin Name
PGND
GND
HSD
VDD
EN
DH
FB
DL
Adjustable
Adjustable
Adjustable
Voltage
Output
Pin Function
High-Side MOSFET Drain Connection (Input): The HSD pin in the input of the adaptive On-time
control circuitry. A 0.1uF ceramic capacitor between the HSD pin and the power ground (PGND) is
required and must be place as close as possible to the IC.
Enable (Input): A logic level control of the output. The EN pin is CMOS compatible. Logic high or
floating = enable, logic low = shutdown. In the off state, the V
reduced (typically 0.7mA). Do not connect the EN pin to the HSD pin.
Feedback (Input): Input to the transconductance amplifier of the control loop. The FB pin is regulated
to 0.8V. A resistor divider connecting the feedback to the output is used to adjust the desired output
voltage.
Signal ground. GND is the ground path for the device bias voltage V
loop for the signal ground should be separate from the power ground (PGND) loop.
V
operating voltage range is from 4.5V to 5.5V. A 1µF ceramic capacitor from the VDD pin to the PGND
pin must be placed next to the IC.
Low-Side Drive (output): High-current driver output for external low-side MOSFET. The DL driving
voltage swings from ground to V
Power Ground. PGND is the ground path for the buck converter power stage. The PGND pin
connects to the sources of low-side N-Channel external MOSFETs, the negative terminals of input
capacitors, and the negative terminals of output capacitors. The loop for the power ground should be
as small as possible and separate from the Signal ground (GND) loop.
High-Side Drive (output): High-current driver output for external high-side MOSFET. The DH driving
voltage is floating on the switch node voltage (V
gate of the high-side N-channel MOSFETs can slow down the turn-on and turn-off time of the
MOSFETs.
DD
Bias (Input): Power to the internal reference and control sections of the MIC2176. The V
Switching Frequency
100kHz
200kHz
300kHz
10-Pin MSOP (MM)
Junction Temperature Range
DD
.
2
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
SW
). Adding a small resistor between DH pin and the
DD
supply current of the device is
DD
10-pin MSOP
10-pin MSOP
10-pin MSOP
Package
and the control circuitry. The
M9999-111710-A
Lead Finish
Pb-Free
Pb-Free
Pb-Free
MIC2176
DD