FAN5092MTC Datasheet, PDF (2/20 Pages) Fairchild Semiconductor – High Current System Voltage Buck Converter

FAN5092
Pin Assignments
VID0
VID1
VID2
VID3
VID4
CLK
BYPASS
AGND
LDRVB
GNDB
ISNSB
SWB
HDRVB
BOOTB
1
28
2
27
3
26
4
25
5
24
6
23
7
FAN5092
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
VFB
RT
ENABLE/SS
DROOP/E*
ISHR
PHASE
PWRGD
VCC
LDRVA
GNDA
ISNSA
SWA
HDRVA
BOOTA
PRODUCT SPECIFICATION
Pin Definitions
Pin Number
Pin Name
1-5
VID0-4
6
CLK
7
BYPASS
8
AGND
9
LDRVB
10
GNDB
11
ISNSB
12
SWB
13
HDRVB
14
BOOTB
15
BOOTA
16
HDRVA
17
SWA
18
ISNSA
Pin Function Description
Voltage Identification Code Inputs. These open collector/TTL compatible
inputs will program the output voltage over the ranges specified in Table 1.
Clock. When PHASE is high, this pin puts out a clock signal synchronized
180° out of phase with the internal master clock. When PHASE is low, this pin
is an input for a synchronizing clock signal.
5V Rail. Bypass this pin with a 0.1µF ceramic capacitor to AGND.
Analog Ground. Return path for low power analog circuitry. This pin should
be connected to a low impedance system ground plane to minimize ground
loops.
Low Side FET Driver for B. Connect this pin to the gate of an N-channel
MOSFET for synchronous operation. The trace from this pin to the MOSFET
gate should be <0.5”.
Ground B. Ground-side current sense pin. Connect directly to low-side
MOSFET source, or to sense resistor ground.
Current Sense B. Sensor side of current sense. Attach to low-side MOSFET
drain, or to source side of sense resistor.
High side driver source and low side driver drain switching node B. Gate
drive return for high side MOSFET, and negative input for low-side MOSFET
current sense.
High Side FET Driver B. Connect this pin to the gate of an N-channel
MOSFET. The trace from this pin to the MOSFET gate should be <0.5”.
Bootstrap B. Input supply for high-side MOSFET.
Bootstrap A. Input supply for high-side MOSFET.
High Side FET Driver A. Connect this pin to the gate of an N-channel
MOSFET. The trace from this pin to the MOSFET gate should be <0.5”.
High side driver source and low side driver drain switching node A. Gate
drive return for high side MOSFET, and negative input for low-side MOSFET
current sense.
Current Sense A. Sensor side of current sense. Attach to low-side MOSFET
drain, or to source side of sense resistor.
2
REV. 1.0.7 6/20/02