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VO

1

Connect to output of converter. This terminal is used for On-Time Adjustment.

VFB

2

Converter feedback input. Connect with feedback resistor divider.

VREG5

3

5.5 V power supply output. A capacitor (typical 1mF) should be connected to GND.

SS

4

Soft-start control. A external capacitor should be connected to GND.

GND

5

Signal ground pin

PG

6

Open drain power good output

EN

7

Enable control input

PGND1,
PGND2

8, 9

Ground returns for low-side MOSFET. Also serve as inputs of current comparators. Connect PGND and GND
strongly together near the IC.

SW1, SW2

10, 11

Switch node connection between high-side NFET and low-side NFET. Also serve as inputs to current compara-
tors.

VBST

12

Supply input for high-side NFET gate driver (boost terminal). Connect capacitor from this pin to respective SW1,
SW2 terminals. An internal PN diode is connected between VREG5 to VBST pin.

VIN

13

Power input and connected to high side NFET drain

VCC

14

Supply input for 5 V internal linear regulator for the control circuitry

PowerPAD™

Back side

Thermal pad of the package. Must be soldered to achieve appropriate dissipation. Should be connected to
PGND.

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Note:

1. RTL (Retention Time Limited)

The "RTL" marking indicates that its Retention Time is
Limited.
When production is discontinued, this item will continue to
be available only for 
a specific period of time. This period of time depends on
the type of item,
and the local laws governing parts and product retention.
At the end of this period, the item will no longer be avail-
able.

2. Important safety notice

Components identified by the   mark indicates special
characteristics important for safety. When replacing any
of these components, only use specified manufacture's
parts.

3. The S mark means the part is one of some identical parts.

For that reason, it may be different from the installed part.

4. ISO code (Example: ABS-94HB) of the remarks column

shows quality of the material and a flame resisting grade
about plastics.

5. RESISTORS & CAPACITORS

Unless otherwise specified;
All resistors are in ohms (

Ω), k=1000Ω, M=1000kΩ

All capacitors are in MICRO FARADS (

µF), p=µµF

*Type & Wattage of Resistor

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