SW

SW

PGND

PGND

VIN

VIN

CBOOT

VCC

BIAS

FB

SYNC

FPWM

EN

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

AGND

N/C

EP

RESET

(17)

3

LM53602, LM53603

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SNVSAR0 – NOVEMBER 2016

Product Folder Links: LM53602 LM53603

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Copyright © 2016, Texas Instruments Incorporated

(1)

Some text and images in this datasheet refer to fixed 3.3-V or 5-V output devices which are only available in the automotive grade

version of this device as the LM53603-Q1 and LM53602-Q1. Refer to the automotive datasheet for more information on those output

voltage options.

5 Device Comparison Table

OUTPUT VOLTAGE

MAXIMUM OUTPUT

CURRENT

PACKAGE QTY

LM53603AMPWPR

Adjustable

3 A

2000

LM53603AMPWPT

Adjustable

3 A

250

LM53602AMPWPR

Adjustable

2 A

2000

LM53602AMPWPT

Adjustable

2 A

250

(1)

O = Output, I = Input, G = Ground, P = Power

6 Pin Configuration and Functions

PWP Package

16-Lead HTSSOP

Top View

Pin Functions

PIN

DESCRIPTION

NO.

NAME

1, 2

SW

P

Regulator switch node. Connect to power inductor. Connect pins 1 and 2 directly together at the PCB.

3

CBOOT

P

Bootstrap supply input for gate drivers. Connect a high-quality, 470-nF capacitor from this pin to SW.

4

VCC

O

Internal 3.15-V regulator output. Used as supply to internal control circuits. Do not connect to any

external loads. Can be used as logic supply for control inputs. Connect a high-quality, 3.3-µF capacitor

from this pin to GND.

5

BIAS

P

Input to internal voltage regulator. Connect to output voltage point. Do not ground. Connect a high-

quality, 0.1-µF capacitor from this pin to GND.

6

SYNC

I

Synchronization input to regulator. Used to synchronize the regulator switching frequency to the system

clock. When not used connect to GND; do not float.

7

FPWM

I

Mode control input to regulator. High = forced PWM (FPWM). Low = auto mode; automatic transition

between PFM and PWM. Do not float.

8

RESET

O

Open-drain reset output. Connect to suitable voltage supply through a current limiting resistor. High =

power OK. Low = fault. RESET goes low when EN = low.

9

FB

I

Feedback input to regulator. Connect to output voltage sense point for fixed 5-V and 3.3-V output.

Connect to feedback divider tap point for ADJ option. Do not float or ground.

10

AGND

G

Analog ground for regulator and system. All electrical parameters are measured with respect to this pin.

Connect to EP and PGND on PCB.

11

EN

I

Enable input to the regulator. High = ON. Low = OFF. Can be connected directly to VIN. Do not float.

12, 13

VIN

P

Input supply to the regulator. Connect a high-quality bypass capacitor(s) from this pin to PGND.

Connect pins 12 and 13 directly together at the PCB.

14

N/C

—

This pin has no connection to the device.