Datasheet LT3652HV (Analog Devices)

LT3652HV Power Tracking 2A Battery Charger
FEATURES DESCRIPTION
n
Input Supply Voltage Regulation Loop for Peak
The LT®3652HV is a complete monolithic step-down bat-
Power Tracking in (MPPT) Solar Applications
tery charger that operates over a 4.95V to 34V input range. n
Wide Input Voltage Range: 4.95V to 34V (40V Abs Max)
The LT3652HV provides a constant-current/constant-voltage n
Programmable Charge Rate Up to 2A
charge characteristic, with maximum charge current n
User Selectable Termination: C/10 or On-Board
external y programmable up to 2A. The charger employs
Termination Timer
a 3.3V float voltage feedback reference, so any desired n
Resistor Programmable Float Voltage Up to 18V
battery float voltage up to 18V can be programmed with a
Accommodates 4-Cell Li-Ion/Polymer, 5-Cell
resistor divider.
LiFePO4, Lead-Acid Chemistries
The LT3652HV employs an input voltage regulation loop, n
Parallelable for Higher Output Current
which reduces charge current if the input voltage falls below n 1MHz Fixed Frequency a programmed level, set with a resistor divider. When the n 0.5% Float Voltage Reference Accuracy LT3652HV is powered by a solar panel, the input regulation n 5% Charge Current Accuracy loop is used to maintain the panel at peak output power. n 2.5% C/10 Detection Accuracy n The LT3652HV can be configured to terminate charging when Binary-Coded Open-Collector Status Pins n charge current falls below 1/10 of the programmed maximum Thermally Enhanced 3mm × 3mm DFN and MSE (C/10). Once charging is terminated, the LT3652HV enters a Packages low-current (85µA) standby mode. An auto-recharge feature starts a new charging cycle if the battery voltage falls 2.5%
APPLICATIONS
below the programmed float voltage. The LT3652HV also n Solar Powered Applications contains a programmable safety timer, used to terminate n Remote Monitoring Stations charging after a desired time is reached. This al ows top-off n Portable Handheld Instruments charging at currents less than C/10. n 12V to 24V Automotive Systems n Battery Charging from Current Limited Adapter 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 1A/24VDC Unregulated Adapter Drooping Lower Than 24V 5-Cell LiFePO4 Charger (18V at 1.5A) with C/10 Termination I vs V Characteristic Powered by Inexpensive 24VDC/1A Unregulated Wall Adapter.
36 D3 33 AC ADAPTER MBRS340 MBRS340 30 INPUT V SW IN 24VDC AT 1A LT3652HV 750k 1µF 10V 1N4148 27 VIN_REG BOOST 20µH 44.2k 10µF SHDN 0.068 24 SENSE SYSTEM LOAD 51.1k CHRG 21 BAT FAULT 18 NTC 665k + ADAPTER OUTPUT VOLTAGE (V) TIMER 127k 15 V 10µF FB 3652 TA01a 150k 12 R1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 10K ADAPTER OUTPUT CURRENT (A) B = 3380 5-CELL LiFePO4 PACK 3652 TA01b (18V FLOAT) 3652hvfb For more information www.linear.com/LT3652HV 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts