TOKO TK65333MTL, TK65318MTL, TK65330MTL Datasheet

January 1999 TOKO, Inc. Page 1

TK653xx

ADVANCED INFORMATION

V

OUT

V

IN

LBO

LBI/SB

SW

CONTROL

CIRCUIT

BATTERY
MONITOR

REF

LBOOFF

PGND

GND

PV

IN

The TK653xx mid power step-down converter is designed
for portable battery powered systems, capable of operating
from single Li-ion battery cells or two NiCad battery cells.
The TK653xx provides the power switch, synchronous
rectifier, and the control circuit for a buck step-down
converter. Only three external components are required to
complete the step-down conversion.

The TK653xx provides laser-trimmed output voltages
ranging from 1.8 V to 3.3 V. The low resistance MOSFET
switch and synchronous rectifier allow average currents
up to 800 mA, while maintaining peak efficiencies up to
95%. A low-battery threshold and turn-off threshold can be
individually programmed by the user, utilizing a single
resistor divider connected to the Low Battery Input (LBI)
pin. When the resistively-divided supply voltage on the LBI
pin drops below approximately 1.25 V, the Low Battery
Output (LBO) pin will become asserted. The dual-function
LBI pin can alternatively be used as a Standby (SB) pin.
Driving the SB pin low will disable the TK653xx and drop
the quiescent current on the input supply to approximately
10 µA.

Pulse Burst Modulation (PBM) is used to regulate the
voltage at the V

OUT

pin of the IC. When the output voltage
of the TK653xx drops below the regulation threshold, a
current pulse is transferred from the input supply to the

FEATURES

■ Very Low Quiescent Current (10 µA)

■ Extremely Low Operating Current (25 µA)

■ Internal Battery Monitor

■ Regulates Down to 1.8 V

■ Short Circuit Protection

■ Synchronous Rectification

■ Up To 95% Efficient

BLOCK DIAGRAM

TK653xxM

LBO

V

IN

SW

GND

LBI/SB

V

OUT

PGND

PV

IN

ORDERING INFORMATION

TAPE/REEL CODE

TL: Tape Left

Tape/Reel Code

TK653xxM

VOLTAGE CODE

Voltage Code

ADVANCED

INFORMATION

APPLICATIONS

■ Battery Powered System

■ Cellular Telephones

■ Pagers

■ Personal Communications Equipment

■ Radio Controlled Systems

■ Toys

output. The TK653xx utilizes a proprietary control scheme,
where the average amplitude of the current pulse is varied
depending upon the current loads. The proprietary
architecture allows fast transient response and minimal
ripple while maintaining ease-of-use and low component
count.

The TK653xx is available in SOP-8 and DIP-8 packages.

DESCRIPTION

HIGH CURRENT STEP-UP CONVERTER WITH

BATTERY MONITOR

Page 2

TK653xx

January 1999 TOKO, Inc.

ADVANCED INFORMATION

0.1

3.9

0.42

1.27

1.45

e

4.89

6.07

0.2

0 ~ 0.25

1.27

0.76

5.4

1.27

e

e

1

0.5
0 ~ 10

1.64

Recommended Mount Pad

85

4

1

0.3

+

0.3

+

Dimensions are shown in millimeters
Tolerance: x.x =

0.2 mm (unless otherwise specified

)

0.12

l

Marking Information

Marking
TK653xx

SOP-8

PACKAGE OUTLINE

Printed in the USA© 1999 Toko, Inc.

All Rights Reserved

TOKO AMERICA REGIONAL OFFICES

Toko America, Inc. Headquarters
1250 Feehanville Drive, Mount Prospect, Illinois 60056
Tel: [phone] Fax: [phone]

IC-xxx-TK653xx

0798O0.0K

Visit our Internet site at http://www.tokoam.com

The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its
products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of
third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.

Western Regional Office
Toko America, Inc.
2480 North First Street , Suite 260
San Jose, CA 95131
Tel: [phone]
Fax: [phone]

Midwest Regional Office
Toko America, Inc.
1250 Feehanville Drive
Mount Prospect, IL 60056
Tel: [phone]
Fax: [phone]

Eastern Regional Office
Toko America, Inc.
107 Mill Plain Road
Danbury, CT 06811
Tel: [phone]
Fax: [phone]

Semiconductor Technical Support
Toko Design Center
4755 Forge Road
Colorado Springs, CO 80907
Tel: [phone]
Fax: [phone]