XR76208EL-Q Datasheet, PDF (6/21 Pages) Exar Corporation – AEC-Q100 Qualified 40V PowerBloxTM 3A/5A/8A Synchronous Step Down COT Regulator

XR76203-Q/XR76205-Q/XR76208-Q
Pin Assignments
Pin No.
1
2
Pin Name
ILIM
EN/MODE
3
TON
4
SS
5
PGOOD
6
FB
7, 10, AGND
Pad
8
9
11-14, 20,
29, SW Pad
15-19,
PGND Pad
21-28, PVIN
Pad
30
AGND
VIN
VCC
SW
PGND
PVIN
BST
Type
A
I
A
A
O, OD
A
A
Description
Over-current 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 depend-
ing 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 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.
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 regulator’s LDO. Normally it is connected to PVIN.
The output of regulator’s 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 system’s 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.
Type: A = Analog, I = Input, O = Output, I/O = Input/Output, PWR = Power, OD = Open-Drain
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exar.com/XR76203-Q/XR76205-Q/XR76208-Q
Rev 1C