uP1537

1

uP1537-DS-F0000, Feb. 2018

www.upi-semi.com

Wide Input Voltage Range 3V ~ 26V

Output Voltage Range 0.7V ~ 2.6V

Build-in 1% 0.7V Reference

Architecture

4 Selectable Frequency Setting

Internal 1ms Soft-start

Pre-charged Start-up Capability

Built-in Output Discharge

Power OK Indication

Over Voltage, Under Voltage, and Over

Temperature Protection

WDFN3x3-10L and WQFN2x2-12L package

RoHS Compliant and Halogen Free

r

e

b

m

u

N

r

e

d

r

Oe

p

y

T

e

g

a

k

c

a

Pg

n

i

k

r

a

M

p

o

T

A

D

D

P

7

3

5

1

P

uL

0

1

-

3

x

3

N

F

D

WP

7

3

5

1

P

u

B

K

Q

R

7

3

5

1

P

uL

2

1

-

2

x

2

N

F

Q

WR

7

3

5

1

P

u

Notebook Computers

I/O Supplies

System Power Supplies

General Description

Applications

Ordering Information

Features

The uP1537 is a high-efficiency, single synchronous buck

controller suitable for low output voltage point-of-load

applications in notebook computers and similar digital

technology provides fast transient response and high noise

advantage of this control scheme is that it does not require

an external phase compensation network, helping the

designer with ease-of-use and realizing low external

component count configuration. This combination is ideal

for building modern low duty ratio, ultra-fast load step

response DC-DC converters. The output voltage ranges

from 0.7 V to 2.6V, and the conversion input voltage range

is from 3 V to 26V. The switching frequency is selectable

from four preset values using a resistor connected from

switching frequency over a wide range of input and output

voltages, while it increases the switching frequency at step-

up of load.

The RF pin also serves in selecting between auto-skip

mode and forced continuous conduction mode for light

load conditions. The strong gate drivers of the uP1537

allow low R

RoHS compliant and 100% matte tin (Sn) plating that are

suitable for use in SnPb or Pb-free soldering processes.

High Performance, Single Synchronous Step-Down

Controller for Notebook Power Supply

Pin Configuration

PHASE

BOOT

VCC5

11

GND

POK

CS

VFB

1

2

3

4

10

9

8

7

WDFN3x3-10L

RF

5

LGATE

6

EN

UGATE

13

GND

LGATE

10

11

12

VFB

VCC5

7

8

9

3

2

1

5

6

4

EN

PHASE

CS

WQFN2x2-12L