XR79206EL-F Datasheet, PDF (5/20 Pages) Exar Corporation – 40V, 6A Synchronous Step-Down COT Power Module

Pin Configuration
XR79206
SS 1
PGOOD 2
FB 3
AGND 4
AGND 5
VIN 6
VCC 7
PGND 8
SW 9
SW 10
SW 11
SW 12
PGND 13
PGND 14
PGND 15
PGND 16
PGND 17
BST
PAD
AGND
PAD
SW
PAD
PGND
PAD 1
53 PGND
PVIN
PGND
PAD
PAD 2 ^{52 PGND}
51 PGND
50 VOUT
49 VOUT
48 VOUT
47 VOUT
46 VOUT
45 VOUT
VOUT
44 VOUT
PAD
43 VOUT
42 VOUT
41 VOUT
40 VOUT
39 VOUT
38 VOUT
37 VOUT
Pin Functions
Pin Number
1
2
3
4, 5, 69, 70,
AGND Pad
6
7
8
13-23, 51-56,
PGND Pads
9-12, 24-30,
SW Pad
31-50,
VOUT Pad
58-65,
PVIN Pad
66, 67,
BST Pad
68
71
72
Pin Name
SS
PGOOD
FB
AGND
VIN
VCC
PGND
PGND
SW
VOUT
PVIN
BST
ILIM
EN/MODE
TON
Type Description
A
Soft-start pin. Connect an external capacitor between SS and AGND to program the soft-start rate based
on the 10μA internal source current.
OD, O
A
Power-good output. This open-drain output is pulled low when V_OUT is outside the regulation.
Feedback input to feedback comparator. Connect with a set of resistors to VOUT and AGND in order to
program V_OUT.
A Analog ground. Control circuitry of the IC is referenced to this pin. Connect to PGND.
PWR IC supply input. Provides power to internal LDO. Connect to PVIN pins.
PWR The output of LDO. Bypass with a 4.7μF capacitor to AGND.
PWR Controller low-side driver ground. Connect with a short trace to closest PGND pins or PGND pad.
PWR Ground of the power stage. Should be connected to the system’s power ground plane.
PWR
Switching node. It internally connects the source of the high-side FET, the drain of the low-side FET,
the inductor and bootstrap capacitor. Use thermal vias and/or sufficient PCB land area in order to heatsink
the low-side FET and the inductor.
PWR Output of the power stage. Place the output filter capacitors as close as possible to these pins.
PWR Power stage input voltage. Place the input filter capacitors as close as possible to these pins.
A
Controller high-side driver supply pin. It is internally connected to SW via a 0.1μF bootstrap capacitor.
Leave these pins floating.
A Overcurrent protection programming. Connect with a short trace to SW pins.
I
Precision enable pin. Pulling this pin above 1.9V will turn the IC on and it will operate in Forced CCM. If the
voltage is raised above 3.0V, then the IC will operate in DCM or CCM depending on load.
A Constant on-time programming pin. Connect with a resistor to AGND.
NOTE:
A = Analog, I = Input, O = Output, OD = Open Drain, PWR = Power.
REV1B
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