LT1571 Linear Technology, LT1571 Datasheet

LT1571

Manufacturer Part Number

LT1571

Description

Constant-Current/ Constant-Voltage Battery Charger with Preset Voltage and Termination Flag

Manufacturer

Linear Technology

Datasheet

1.LT1571.pdf (16 pages)

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FEATURES

TYPICAL APPLICATIO

APPLICATIO S

Fast Charging of Li-Ion, NiMH and NiCd Batteries

Simple Charge Current Programming Requires Only

One Low Cost, 1/32W Resistor

High Efficiency Charger with Up to

1.5A Charge Current

Precision 0.6% Internal Voltage Reference

Preset Battery Voltages: 4.1V, 4.2V, 8.2V, 8.4V

500kHz or 200kHz Switching Frequency

Minimizes Charger Size

Low Reverse Battery Drain Current: 5 A

Flag Indicates Li-Ion Charge Completion

5% Typical Charge Current Accuracy

Low Shutdown Current

LT1571-5: 500kHz, Fixed 4.1V or 4.2V

LT1571-1: 200kHz, Adjustable Voltage

LT1571-2: 200kHz, Fixed 8.2V or 8.4V

Cellular Phones, PDAs, Notebook Computers,

Portable Instruments

Cradle Chargers for Li-Ion, NiCd, NiMH and

Lead-Acid Rechargeable Batteries

COMPLETE

CHARGE

TO 20V

8.2V

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

with Preset Voltage and Termination Flag

BATTERY

Li-Ion

Figure 1. Compact Li-Ion Cellular Phone Charger (0.8A)

4.2V

***

100k

TOKIN OR MARCON CERAMIC SURFACE MOUNT

COILTRONICS TP3-100, 10 H, 2.2mm HEIGHT (0.8A CHARGING CURRENT)

COILTRONICS TP1 SERIES, 10 H, 1.8mm HEIGHT (<0.5A CHARGING CURRENT)

PANASONIC EEFCD1B220

MBRM120T3

6.19k

Constant-Voltage Battery Charger

300

1 F

22 F

OUT

***

0.33 F

10 F

PROG

FLAG

BAT

BAT2

DESCRIPTIO

The LT

solution to fast-charge rechargeable batteries including

lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and

nickel-cadmium (NiCd) using constant-current and/or

constant-voltage control. The internal switch is capable

of delivering 1.5A DC current (2A peak current). The

onboard current sense resistor (0.1 ) allows simple

charge current programming to within 5% accuracy

using a low cost external resistor. The constant-voltage

output can be selected for 4.1V or 4.2V per cell with 0.6%

accuracy.

LT1571 can charge batteries ranging from 1V to 20V. A

saturating switch operating at 200kHz (LT1571-1,

LT1571-2) or 500kHz (LT1571-5) gives high efficiency

and small charger size. A logic output (flag) indicates

Li-Ion near full charge when the charge current drops to

20% of the programmed value. The LT1571-1 and

LT1571-2 are in a 28-pin fused lead narrow SSOP power

package. The LT1571-5 is in a 16-pin fused lead narrow

SSOP power package.

LT1571-5

, LTC and LT are registered trademarks of Linear Technology Corporation.

SELECT

BOOST

SENSE

GND

CAP

1571 PWM battery charger is a simple, efficient

MBRM120T3

Constant-Current/

MMBD914L

0.22 F

Final Electrical Specifications

0.1 F

1571 F01

L1**

10 H

LT1571 Series

April 2000

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