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What is LT3652?

This electronic component, produced by the manufacturer "Linear Technology", performs the same function as "Power Tracking 2A Battery Charger".


LT3652 Datasheet PDF - Linear Technology

Part Number LT3652
Description Power Tracking 2A Battery Charger
Manufacturers Linear Technology 
Logo Linear Technology Logo 


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LT3652www.DataSheet4U.com
Power Tracking 2A Battery
Charger for Solar Power
FEATURES
n Input Supply Voltage Regulation Loop for Peak
Power Tracking in (MPPT) Solar Applications
n Wide Input Voltage Range: 4.95V to 32V (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 14.4V
Accommodates Li-Ion/Polymer, LiFePO4, SLA,
NiMH/NiCd Chemistries
n No VIN Blocking Diode Required for Battery
Voltages ≤ 4.2V
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
n 3mm × 3mm DFN12 or MSOP-12 Packages
APPLICATIONS
n Solar Powered Applications
n Remote Monitoring Stations
n LiFePO4 (Lithium Phosphate) Applications
n Portable Handheld Instruments
n 12V to 24V Automotive Systems
DESCRIPTION
The LT®3652 is a complete monolithic step-down bat-
tery charger that operates over a 4.95V to 32V input
voltage range. The LT3652 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 14.4V can be
programmed with a resistor divider.
The LT3652 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
LT3652 is powered by a solar panel, the input regulation
loop is used to maintain the panel at peak output power.
The LT3652 can be configured to terminate charging
when charge current falls below 1/10 of the programmed
maximum (C/10). Once charging is terminated, the LT3652
enters a low-current (85μA) standby mode. An auto-re-
charge feature starts a new charging cycle if the battery
voltage falls 2.5% below the programmed float voltage.
The LT3652 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 of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
2A Solar Panel Power Manager With 7.2V LiFePO4 Battery
and 17V Peak Power Tracking
CMSH1-40MA
SOLAR PANEL INPUT
(<40V OC VOLTAGE)
10μF
CMSH3-40MA
SYSTEM LOAD
530k
100k
VIN SW
LT3652
VIN_REG
BOOST
SHDN
SENSE
CHRG
BAT
FAULT
NTC
TIMER
VFB
1μF
542k
459k
10μH
0.05
CMSH3-40MA
10μF
10k
B = 3380
+
2-CELL LiFePO4 (2 × 3.6V) BATTERY PACK
3652 TA01a
Solar Panel Input Voltage
Regulation, Tracks Max Power
Point to Greater Than 98%
22
TA = 25°C
20
18 100% TO 98% PEAK POWER
16
98% TO 95% PEAK POWER
14
12
10
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
CHARGER OUTPUT CURRENT (A)
3652 TA01b
3652fb
1

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LT3652 equivalent
LT3652www.DataSheet4U.com
TYPICAL PERFORMANCE CHARACTERISTICS TJ = 25°C, unless otherwise noted.
VIN_REG Threshold
vs Temperature: ICHG at 50%
2.720
2.715
2.710
2.705
2.700
2.695
2.690
2.685
2.680
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3652 G01
VFB Reference Voltage
vs Temperature
3.304
3.302
3.300
3.298
3.296
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3652 G01a
VIN Standby Mode Current
vs Temperature
100
95
90
85
80
75
70
65
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
3652 G02
Switch Drive (ISW/IBOOST)
vs Switch Current
36
33
30
27
24
21
18
15
12
9
6
3
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
SWITCH CURRENT (A)
3652 G03
Switch Forward Drop (VIN – VSW)
vs Temperature
480
ISW = 2A
460
440
420
400
380
360
340
320
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3652 G04
CC/CV Charging; SENSE Pin Bias
Current vs VSENSE
100
VBAT = VBAT(PRE)
50
0
–50 VBAT = VBAT(FLT)
–100
–150
–200
–250
–300
–350
0 0.5 1 1.5 2 2.5
VSENSE (V)
3652 G05
C/10 Threshold (VSENSE–VBAT)
vs Temperature
12
11
10
9
8
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3652 G06
3652fb
5


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LT3652 datasheet


1. Power Tracking 2A, Battery Charger

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