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MIC2155 Datasheet(PDF) 4 Page - Micrel Semiconductor

Part # MIC2155
Description  2-Phase, Single Output, PWM Synchronous Buck Control IC
PDF  33 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2155 Datasheet(HTML) 4 Page - Micrel Semiconductor

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Micrel, Inc.
MIC2155/2156
May 2009
4
M9999-052709-A
(408) 944-0800
Pin Configuration
BST1
HSD1
SW1
CS1
EN2
SS
COMP1
FB1
HSD2
SW2
N/C
VIN2
VOUT
COMP2
FB2
EA2+
EP
32-Pin MLF
® (ML)
Pin Description
Pin Number
Pin Name
Pin Function
1
BST1
Boost1 (Input): Provides voltage for high-side MOSFET driver 1. The gate drive
voltage is higher than the source voltage by VDD minus a diode drop.
2
HSD1
High-Side Drive 1 (Output): High current output-driver for external. high-side
MOSFET.
3
SW1
Switch Node 1 (Output): Return for HSD1
4
CS1
Current Sense (Input). Current-limit comparator noninverting input. Current is
sensed across the side 1 low-side FET during the off-time. Current limit is set by
the resistor in series with the CS1 pin.
5
EN2
Enable 2 (Input): Channel 2 enable. Pull high to enable. Pull low to disable.
6
SS
Soft Start (Input): Controls the turn-on time of the output voltage. Active at
Power-up, Enable, & Current Limit recovery.
7
COMP1
Compensation 1 (Input): Output of the internal error amplifier for Channel 1.
8
FB1
Feedback 1 (Input): Negative input to the error amplifier of Channel 1.
9
DIFFOUT
Output of remote sense differential amplifier.
10
RMVOUT
Remote VOUT: Connect to Vout at the remote sense point. Input to precision
differential amplifier.
11
RMGND
Remote Ground: Connect to Ground at the remote sense point. Input to
precision differential amplifier.
12
AGND
Analog Ground
13
AVDD
Analog supply voltage (input). Connect to VDD through an RC filter network
14
N/C
No Connect
15
SYNC
Sync (Input) : Synchronizes switching to an external source. Leave floating when
not used.



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