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LTC4121EUD#TRPBF

Description
IC BATT CHARGER 40V 400MA 16QFN
Categorysemiconductor    Power management   
File Size361KB,30 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric Compare View All

LTC4121EUD#TRPBF Overview

IC BATT CHARGER 40V 400MA 16QFN

LTC4121EUD#TRPBF Parametric

Parameter NameAttribute value
battery chemistrypolychemistry
Number of batteries-
Current - chargingConstant current - programmable
Programmable features-
failsafe-
Charging current - maximum400mA
Battery pack voltage18V (maximum)
Voltage - Power Supply (Highest)40V
interface-
Operating temperature-40°C ~ 125°C (TJ)
Package/casing16-WFQFN Exposed Pad
Supplier device packaging16-QFN(3x3)
LTC4121/LTC4121-4.2
40V 400mA Synchronous
Step-Down Battery Charger
FEATURES
n
n
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%.
n
n
n
n
n
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Wide Input Voltage Range: 4.4V to 40V
Temperature Compensated Input Voltage
Regulation for Maximum Power Point Tracking
(MPPT)
Adjustable Float Voltage 3.5V to 18V (LTC4121)
Fixed 4.2V Float Voltage Option (LTC4121-4.2)
High Efficiency: Up to 95%
50mA to 400mA Programmable Charge Current
±1% Feedback Voltage Accuracy
Programmable 5% Accurate Charge Current
Thermally Enhanced, Low Profile (0.75mm)
16-Lead (3mm × 3mm) QFN Package
APPLICATIONS
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n
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Handheld Instruments
Solar Powered Devices
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.
TYPICAL APPLICATION
High Efficiency, Wide Input Voltage Range Charging with LTC4121
IN
10µF
10k
RUN
MPPT
INTV
CC
BOOST
2.2µF
22nF
SLF6025T-470MR48
EFFICIENCY (%)
95
LTC4121 Efficiency vs V
IN
at V
FLOAT
= 8.4V
97
200mA, R
PROG
= 6.04k
400mA, R
PROG
= 3.01k
LTC4121
SW
BAT
+
V
IN
V
BAT
+ 200mV
TO 40V
PROG
FREQ
CHGSNS
1.96M
FB
787k
GND FBG
93
22µF
91
+
Li-Ion
89
V
BAT
= 8.3V
5
10
15
20
25
V
IN
(V)
30
35
40
R
PROG
87
4121 TA01a
4121 TA01b
4121fc
For more information
www.linear.com/LTC4121
1

LTC4121EUD#TRPBF Related Products

LTC4121EUD#TRPBF LTC4121 LTC4121EUD#PBF LTC4121IUD#PBF LTC4121IUD#TRPBF LTC4121IUD-4.2#TRPBF LTC4121IUD-4.2#PBF
Description IC BATT CHARGER 40V 400MA 16QFN 40v 400ma synchronous step-down battery charger IC BATT CHARGER 40V 400MA 16QFN IC BATT CHARGER 40V 400MA 16QFN IC BATT CHARGER 40V 400MA 16QFN IC BATT CHARGER 40V 400MA 16QFN IC BATT CHARGER 40V 400MA 16QFN
battery chemistry polychemistry - polychemistry polychemistry polychemistry Lithium Ion/Polymer Li-ion/polymer
Current - charging Constant current - programmable - Constant current - programmable Constant current - programmable Constant current - programmable Constant current - programmable Constant current - programmable
Charging current - maximum 400mA - 400mA 400mA 400mA 400mA 400mA
Battery pack voltage 18V (maximum) - 18V (maximum) 18V (maximum) 18V (maximum) 4.2V 4.2V
Voltage - Power Supply (Highest) 40V - 40V 40V 40V 40V 40V
Operating temperature -40°C ~ 125°C (TJ) - -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ)
Package/casing 16-WFQFN Exposed Pad - 16-WFQFN Exposed Pad 16-WFQFN Exposed Pad 16-WFQFN Exposed Pad 16-WFQFN Exposed Pad 16-WFQFN Exposed Pad
Supplier device packaging 16-QFN(3x3) - 16-QFN(3x3) 16-QFN(3x3) 16-QFN(3x3) 16-QFN(3x3) 16-QFN(3x3)
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