LINEAR LT1510 LT1510-5 Data Sheet

查询DS8供应商

LT1510/LT1510-5 Constant-Voltage/

Constant-Current Battery Charger

FEATURES

Charges Ni Cd, Ni MH and Lithium-Ion Batteries –– plest, most efficient solution to fast-charge modern re- Only One 1/10W Resistor Is Needed to Program chargeable batteries including lithium-ion (Li-Ion), nickel- Charging Current metal-hydride (Ni MH)* and nickel-cadmium (Ni Cd)* that High Efficiency Current Mode PWM with 1.5A require constant-current and/or constant-voltage charg- Internal Switch and Sense Resistor ing. The internal switch is capable of delivering 1.5A DC 3% Typical Charging Current Accuracy current (2A peak current). The 0.1Ω onboard current Precision 0.5% Voltage Reference for Voltage sense resistor makes the charging current programming Mode Charging or Overvoltage Protection very simple. One resistor (or a programming current from Current Sensing Can Be at Either Terminal of a DAC) is required to set the full charging current (1.5A) to the Battery within 5% accuracy. The LT1510 with 0.5% reference Low Reverse Battery Drain Current: 3µA voltage accuracy meets the critical constant-voltage charg- Charging Current Soft Start ing requirement for lithium cells.

Shutdown Control

The LT1510 can charge batteries ranging from 2V to 20V.

500k Hz Version Uses Small Inductor

Ground sensing of current is not required and the battery’s negative terminal can be tied directly to ground. A saturat-

APPLICATIONS ing switch running at 200k Hz (500k Hz for LT1510-5) gives

high charging efficiency and small inductor size. A block-

Chargers for Ni Cd, Ni MH and Lithium Batteries

ing diode is not required between the chip and the battery

Step-Down Switching Regulator with Precision

because the chip goes into sleep mode and drains only 3µA

Adjustable Current Limit

when the wall adaptor is unplugged. Soft start and shutdown features are also provided. The LT1510 is available in a 16-pin

DESCRIPTION fused lead power SO package with a thermal resistance of

®1510 50°C/W, an 8-pin SO and a 16-pin PDIP.

With switching frequency as high as 500k Hz, The LT

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

current mode PWM battery charger is the smallest, sim- * Ni Cd and Ni MH batteries require charge termination circuitry (not shown in Figure 1).

TYPICAL APPLICATIONS

C1 D1 0.22µF 1N5819 11V TO 28V

MBRM120T3

0.22µF MBRM120T3 8.2V TO 20V SW VCC

SW VCC CIN* +–

CIN* +– 10µF

BOOST PROG

BOOST PROG L1**

L1** 33µH LT1510

10µH LT1510-5 1N914

GND VC 0.1µF

MMBD914L 1k

GND VC 0.1µF

1k OVP

SENSE BAT

SENSE BAT COUT

COUT*** Q3†

4.2V TANT

22µF Q3† VN2222

NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED

TOKIN OR MARCON CERAMIC SURFACE MOUNT

COILTRONICS TP3-100, 10µH, 2.2mm HEIGHT (0.8A CHARGING CURRENT) NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED

COILTRONICS TP1 SERIES, 10µH, 1.8mm HEIGHT (<0.5A CHARGING CURRENT) TOKIN OR MARCON CERAMIC SURFACE MOUNT

PANASONIC EEFCD1B220 0.25% COILTRONICS CTX33-2 1510 F02

OPTIONAL, SEE APPLICATIONS INFORMATION 1510 F01 OPTIONAL, SEE APPLICATIONS INFORMATION

Figure 1. 500k Hz Smallest Li-Ion Cell Phone Charger (0.8A) Figure 2. Charging Lithium Batteries (Efficiency at 1.3A > 87%)