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Linear Technology Electronic Components Datasheet

LTC4121 Datasheet

40V 400mA Synchronous Step-Down Battery Charger

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LTC4121/LTC4121-4.2
40V 400mA Synchronous
Step-Down Battery Charger
Features
nn Wide Input Voltage Range: 4.4V to 40V
nn Temperature Compensated Input Voltage
Regulation for Maximum Power Point Tracking
(MPPT)
nn Adjustable Float Voltage 3.5V to 18V (LTC4121)
nn Fixed 4.2V Float Voltage Option (LTC4121-4.2)
nn High Efficiency: Up to 95%
nn 50mA to 400mA Programmable Charge Current
nn ±1% Feedback Voltage Accuracy
nn Programmable 5% Accurate Charge Current
nn Thermally Enhanced, Low Profile (0.75mm)
16-Lead (3mm × 3mm) QFN Package
Applications
nn Handheld Instruments
nn Solar Powered Devices
nn Industrial/Military Sensors and Devices
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Description
The LTC®4121 is a 400mA constant-current/constant-
voltage (CC/CV) synchronous step-down battery charger.
In addition to CC/CV operation, the LTC4121 regulates its
input voltage to a programmable percentage of the input
open-circuit voltage. This technique maintains maximum
power transfer with high impedance input sources such
as solar panels.
An external resistor programs the charge current up to
400mA. The LTC4121-4.2 is suitable for charging Li-Ion/
Polymer batteries, while the programmable float voltage
of the LTC4121 is suitable for several battery chemistries.
The LTC4121 and LTC4121-4.2 include an accurate RUN
pin threshold, low voltage battery preconditioning and bad
battery fault detection, timer termination, auto-recharge,
and NTC temperature qualified charging. The FAULT pin
provides an indication of bad battery or temperature faults.
Once charging is terminated, the LTC4121 signals end-of-
charge via the CHRG pin, and enters a low current SLEEP
mode. An auto-restart feature starts a new charging cycle
if the battery voltage drops by 2.2%.
Typical Application
High Efficiency, Wide Input Voltage Range Charging with LTC4121
10µF 10k
+–
VIN
VBAT + 200mV
TO 40V
IN INTVCC
RUN BOOST
MPPT
LTC4121
SW
CHGSNS
BAT
PROG
FB
RPROG
FREQ GND FBG
2.2µF
22nF
SLF6025T-470MR48
1.96M
787k +
Li-Ion
22µF
4121 TA01a
LTC4121 Efficiency vs VIN at VFLOAT = 8.4V
97
200mA, RPROG = 6.04k
400mA, RPROG = 3.01k
95
93
91
89
VBAT = 8.3V
87
5 10 15 20 25 30 35 40
VIN (V)
4121 TA01b
For more information www.linear.com/LTC4121
4121fa
1


Linear Technology Electronic Components Datasheet

LTC4121 Datasheet

40V 400mA Synchronous Step-Down Battery Charger

No Preview Available !

LTC4121/LTC4121-4.2
Absolute Maximum Ratings
(Note 1)
IN, RUN, CHRG, FAULT, MPPT.................... –0.3V to 43V
BOOST.................................... VSW – 0.3V to (VSW + 6V)
SW (DC)......................................... –0.3V to (VIN + 0.3V)
SW (Pulsed <100ns)....................... –1.5V to (VIN + 1.5V)
CHGSNS, BAT, FB/BATSNS, FBG................. –0.3V to 18V
FREQ, NTC, PROG, INTVCC........................... –0.3V to 6V
ICHGSNS, IBAT...................................................... ±600mA
ICHRG, IFAULT, .........................................................±5mA
IFB, IFBG (LTC4121)..................................................±5mA
IBATSNS (LTC4121-4.2)............................................±5mA
IINTVCC................................................................... –5mA
Operating Junction Temperature Range
(Note 2)................................................... –40°C to 125°C
Storage Temperature Range..................... –65°C to 150°
Pin Configuration
LTC4121
TOP VIEW
INTVCC 1
BOOST 2
IN 3
SW 4
16 15 14 13
12
11
GND
10
9
5678
NTC
FBG
FB
BAT
LTC4121-4.2
TOP VIEW
INTVCC 1
BOOST 2
IN 3
SW 4
16 15 14 13
12 NTC
GND 11 NC
10 BATSNS
9 BAT
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 54°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB TO OBTAIN θJA
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 54°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB TO OBTAIN θJA
Order Information
LTC4121 Options
PART NUMBER
LTC4121
LTC4121-4.2
FLOAT VOLTAGE
Programmable
4.2V Fixed
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC4121EUD#PBF
LTC4121EUD#TRPBF
LGHC
16-Lead (3mm × 3mm) Plastic QFN
LTC4121IUD#PBF
LTC4121IUD#TRPBF
LGHC
16-Lead (3mm × 3mm) Plastic QFN
LTC4121EUD-4.2#PBF LTC4121EUD-4.2#TRPBF LGMV
16-Lead (3mm × 3mm) Plastic QFN
LTC4121IUD-4.2#PBF
LTC4121IUD-4.2#TRPBF LGMV
16-Lead (3mm × 3mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2 For more information www.linear.com/LTC4121
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
4121fa


Part Number LTC4121
Description 40V 400mA Synchronous Step-Down Battery Charger
Maker Linear Technology
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LTC4121 Datasheet PDF






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