MIC2150 Datasheet, PDF (3/27 Pages) Micrel Semiconductor – 2-Phase Dual Output PWM Synchronous Buck Control IC

Micrel, Inc.
Pin Number
13
14
15
16
17
18
19
20
21
22
23
24
EPAD
MIC2150
Pin Name
SS2
CS2
SW2
HSD2
BS2
PGND2
LSD2
VDD
EN
VIN
LSD1
PGND1
EP
Pin Function
Soft-start, Output 2(Input): Controls the turn-on time of the output voltage. Active
at power-up, Enable and Current Limit recovery.
Current Limit 2 (Input): Current-limit comparator non-inverting input. The current
limit is sensed across the low-side FET during the ON time. Current limit is set
by the resistor in series with the CS2 pin.
Switch node 2 (Output): High current output driver return for HSD2.
High-Side Drive 2 (Output): High current output-driver for the high-side
MOSFET.
Boost 2 (Input): Provides voltage for high-side MOSFET driver 2. The gate drive
voltage is higher than the source voltage by V_DD minus a diode drop.
Power Ground 2. High current return for low-side driver 2 & CS2.
Low-Side Drive 2 (Output): High-current driver output for external MOSFET.
5V Internal Linear Regulator from V_IN (Output): V_DD is the ext. MOSFET gate
drive supply voltage and an internal supply bus for the IC. When V_IN is <5V, this
regulator operates in drop-out mode. Connect external bypass capacitor.
Enable (Input): Dual threshold enable pin. Logic low turns the IC off. Exceeding
lower threshold enables Channel 1, exceeding higher threshold then enables
Channel 2. The dual threshold function allows the option of power up sequencing
from a single EN pin. Both channels must be turned on and off together.
The enable pin must be driven higher than 2.8V for proper operation.
Supply voltage Channel 1 (Input): 4.5V to 14V
Low-Side Drive 1 (Output): High-current driver output for external MOSFET.
Power Ground 1: High current return for low-side driver 1 & CS1.
Exposed Pad (Power): Must make a full connection to the GND plane to
maximize thermal performance of the package.
August 2009
3
M9999-082809-A
[phone]