XR76117 Datasheet, PDF (5/18 Pages) Exar Corporation – PowerBloxTM 15A Synchronous

Pin Configuration
TOP VIEW
SW
12
PVIN 13
XR76117
BOTTOM VIEW
11 PGND
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BST 14
EN 15
SS 16
17
AGND
8 VS
9 VIN
10 VC
BST 14
EN 15
SS 16
17
AGND
10 VCC
9 VIN
8 VSNS
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PVIN 13
11 PG
12
SW
Pin Functions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Pin Name
FB
FCCM
AGND
TON
ILIM
PGOOD
VSNS
VIN
VCC
PGND
SW
PVIN
BST
EN
SS
AGND PAD
Type
Analog
Input
Description
Feedback input to feedback comparator.
Forcing this pin logic level high forces CCM operation.
Analog
Signal ground for control circuitry. Connect to AGND pad with a short trace.
Analog
Analog
Output,
Open Drain
Analog
Analog
Analog
Power
Power
Power
Analog
Input
Analog
Analog
Constant on-time programming pin. Connect with a resistor to AGND.
Overcurrent protection programming. Connect with a resistor to SW.
Power-good output. Open drain to AGND. Low Z when IC unpowered.
Sense pin for output OVP and open FB.
Supply input for the regulator’s LDO. Normally connected to PV_IN.
The output of regulators LDO. It requires a 4.7µF V_CC bypass capacitor. For operation
using a 5V rail, VCC should be tied to VIN.
Ground of the power stage. Internally connected to source of the low-side MOSFET.
Switch node. Internally it connects source of the high-side MOSFET to drain of the
low-side MOSFET.
Input voltage for power stage. Internally connected to drain of the high-side MOSFET.
High-side driver supply pin. Connect a 0.1µF bootstrap capacitor between BST and SW.
Precision enable pin. Pulling this pin above 2V will enable the regulator.
Soft-start pin. Connect an external capacitor between SS and AGND to program the soft-
start rate based on the 10µA internal source current.
Signal ground for control circuitry.
REV1A
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