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LT3652HVEDD

Power Tracking 2A Battery Charger

Linear Technology 

LT3652HV

Power Tracking 2A Battery

Charger

FEATURES

n Input Supply Voltage Regulation Loop for Peak

Power Tracking in (MPPT) Solar Applications

n Wide Input Voltage Range: 4.95V to 34V (40V Abs Max)

n Programmable Charge Rate Up to 2A

n User Selectable Termination: C/10 or On-Board

Termination Timer

n Resistor Programmable Float Voltage Up to 18V

Accommodates 4-Cell Li-Ion/Polymer, 5-Cell

LiFePO4, Lead-Acid Chemistries

n Parallelable for Higher Output Current

n 1MHz Fixed Frequency

n 0.5% Float Voltage Reference Accuracy

n 5% Charge Current Accuracy

n 2.5% C/10 Detection Accuracy

n Binary-Coded Open-Collector Status Pins

APPLICATIONS

n Solar Powered Applications

n Remote Monitoring Stations

n Portable Handheld Instruments

n 12V to 24V Automotive Systems

n Battery Charging from Current Limited Adapter

DESCRIPTION

The LT®3652HV is a complete monolithic step-down bat-

tery charger that operates over a 4.95V to 34V input range.

The LT3652HV provides a constant-current/constant-voltage

charge characteristic, with maximum charge current

externally programmable up to 2A. The charger employs

a 3.3V float voltage feedback reference, so any desired

battery float voltage up to 18V can be programmed with a

resistor divider.

The LT3652HV employs an input voltage regulation loop,

which reduces charge current if the input voltage falls below

a programmed level, set with a resistor divider. When the

LT3652HV is powered by a solar panel, the input regulation

loop is used to maintain the panel at peak output power.

The LT3652HV can be configured to terminate charging when

charge current falls below 1/10 of the programmed maximum

(C/10). Once charging is terminated, the LT3652HV enters a

low-current (85μA) standby mode. An auto-recharge feature

starts a new charging cycle if the battery voltage falls 2.5%

below the programmed float voltage. The LT3652HV also

contains a programmable safety timer, used to terminate

charging after a desired time is reached. This allows top-off

charging at currents less than C/10.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

TYPICAL APPLICATION

VIN_REG Loop Servos Maximum Charge Current to Prevent AC Adapter Output from

Drooping Lower Than 24V 5-Cell LiFePO4 Charger (18V at 1.5A) with C/10 Termination

Powered by Inexpensive 24VDC/1A Unregulated Wall Adapter.

AC ADAPTER

INPUT

24VDC AT 1A

MBRS340

750k

44.2k

10μF

51.1k

VIN

SW

LT3652HV

VIN_REG

BOOST

SHDN

SENSE

CHRG

BAT

FAULT

NTC

TIMER

VFB

3652 TA01a

1μF 10V 1N4148

D3

MBRS340

20μH

0.068

SYSTEM

LOAD

665k

127k

150k

R1

10K

B = 3380

+

10μF

5-Cell LiFePO4 PACK

(18V FLOAT)

1A/24VDC Unregulated Adapter

I vs V Characteristic

36

33

30

27

24

21

18

15

12

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2

ADAPTER OUTPUT CURRENT (A)

3652 TA01b

3652hvf

1

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