Linear Technology LT3652EDD Demo Board, Power Tracking 2A Battery Charger for Solar Power DC1568A DC1568A 数据表
产品代码
DC1568A
LT3652
1
3652fd
TYPICAL APPLICATION
DESCRIPTION
Power Tracking 2A Battery
Charger for Solar Power
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 fl oat voltage feedback reference,
so any desired battery fl oat voltage up to 14.4V can be
programmed with a resistor divider.
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 fl oat voltage feedback reference,
so any desired battery fl oat 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.
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 confi gured 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 fl oat 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.
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 fl oat 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.
2A Solar Panel Power Manager With 7.2V LiFePO
4
Battery
and 17V Peak Power Tracking
FEATURES
APPLICATIONS
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, LiFePO
4
,
SLA Chemistries
n
No V
IN
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
n
Solar Powered Applications
n
Remote Monitoring Stations
n
LiFePO
4
(Lithium Phosphate) Applications
n
Portable Handheld Instruments
n
12V to 24V Automotive Systems
Solar Panel Input Voltage
Regulation, Tracks Max Power
Point to Greater Than 98%
Regulation, Tracks Max Power
Point to Greater Than 98%
SW
V
IN
SOLAR PANEL INPUT
(<40V OC VOLTAGE)
V
IN_REG
V
FB
BOOST
SENSE
BAT
NTC
TIMER
CMSH3-40MA
SYSTEM LOAD
1μF
542k
459k
3652 TA01a
10k
B = 3380
B = 3380
2-CELL LiFePO
4
(2 × 3.6V) BATTERY PACK
+
10μF
CMSH1-40MA
10μF
10μH
0.05
LT3652
530k
100k
SHDN
CHRG
FAULT
CMSH3-40MA
CHARGER OUTPUT CURRENT (A)
0.2
INPUT REGULATION VOLTAGE (V)
10
12
14
20
18
16
0.6
1
1.2
3652 TA01b
22
0.4
0.8
1.6
1.4
2
1.8
100% TO 98% PEAK POWER
98% TO 95% PEAK POWER
T
A
= 25°C
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Technology Corporation. All other trademarks are the property of their respective owners.