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| XR76201 Datasheet, PDF (5/16 Pages) Exar Corporation – 40V PowerBloxTM 1.5A Synchronous Step-Down COT Regulator | |||
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Pin Configuration, Top View
BST SW PVIN PVIN PVIN PVIN PVIN PVIN
30 29 28 27 26 25 24 23
ILIM 1
EN 2
TON 3
SS 4
PGOOD 5
FB 6
AGND 7
PVIN PAD
22 PVIN
21 PVIN
20 SW
19 PGND
AGND PAD
SW PAD
18 PGND
PGND 17 PGND
PAD
16 PGND
8 9 10 11 12 13 14
VIN VCC AGND SW SW SW SW
15 PGND
XR76201
Pin Functions
Pin Number Pin Name
Type Description
1
2
3
4
5
6
7, 10,
AGND Pad
8
9
11-14, 20, 29,
SW Pad
15-19,
PGND Pad
21-28,
PVIN Pad
30
ILIM
EN/MODE
TON
SS
PGOOD
FB
AGND
VIN
VCC
SW
PGND
PVIN
BST
A
I
A
A
O, OD
A
A
Overcurrent protection programming. Connect with a resistor to SW.
Precision enable pin. Pulling this pin above 1.9V will turn the regulator on and it will operate in CCM.
If the voltage is raised above 3.0V then the regulator will operate in DCM/CCM depending on load.
Constant on-time programming pin. Connect with a resistor to AGND.
Soft-start pin. Connect an external capacitor between SS and AGND to program the soft-start rate
based on the 10uA internal source current.
Power-good output. This open-drain output is pulled low when VOUT is outside the regulation.
Feedback input to feedback comparator. Connect with a set of resistors to VOUT and AGND in order
to program VOUT.
Signal ground for control circuitry. Connect AGND Pad with a short trace to pins 7 and 10.
A
A
PWR
PWR
PWR
Supply input for the regulatorâs LDO. Normally it is connected to PVIN.
The output of regulatorâs LDO. For operation using a 5V rail, VCC should be shorted to VIN.
Switch node. Drain of the low-side N-channel MOSFET. Source of the high-side MOSFET is wire-
bonded to the SW Pad. Pins 20 and 29 are internally connected to SW pad.
Ground of the power stage. Should be connected to the systemâs power ground plane. Source of the
low-side MOSFET is wire-bonded to PGND Pad.
Input voltage for power stage. Drain of the high-side N-channel MOSFET.
A
High-side driver supply pin. Connect a bootstrap capacitor between BST and pin 29.
NOTE:
A = Analog, I = Input, O = Output, OD = Open Drain, PWR = Power.
REV1A
5/16
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