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LTC4121EUD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC4121/LTC4121-4.2
1
4121fc
For more information www.linear.com/LTC4121
TYPICAL APPLICATION
FEATURES DESCRIPTION
40V 400mA Synchronous
Step-Down Battery Charger
The LT C
®
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%.
LTC4121 Efficiency vs V
IN
at V
FLOAT
= 8.4V
APPLICATIONS
n
Wide Input Voltage Range: 4.4V to 40V
n
Temperature Compensated Input Voltage
Regulation for Maximum Power Point Tracking
(MPPT)
n
Adjustable Float Voltage 3.5V to 18V (LTC4121)
n
Fixed 4.2V Float Voltage Option (LTC4121-4.2)
n
High Efficiency: Up to 95%
n
50mA to 400mA Programmable Charge Current
n
±1% Feedback Voltage Accuracy
n
Programmable 5% Accurate Charge Current
n
Thermally Enhanced, Low Profile (0.75mm)
16-Lead (3mm × 3mm) QFN Package
n
Handheld Instruments
n
Solar Powered Devices
n
Industrial/Military Sensors and Devices
L, LT , LT C , LT M , 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.
INTV
CC
BOOST
SW
CHGSNS
BAT
FB
FBG
IN
RUN
MPPT
PROG
LTC4121
GND
10k
10µF
R
PROG
V
IN
V
BAT
+ 200mV
TO 40V
22nF
SLF6025T-470MR48
2.2µF
FREQ
+
22µF
1.96M
787k
4121 TA01a
Li-Ion
+
–
High Efficiency, Wide Input Voltage Range Charging with LTC4121
V
IN
(V)
5
87
EFFICIENCY (%)
89
91
93
95
97
10 15 20
4121 TA01b
25 30 35 40
200mA, R
PROG
= 6.04k
400mA, R
PROG
= 3.01k
V
BAT
= 8.3V
LTC4121/LTC4121-4.2
2
4121fc
For more information www.linear.com/LTC4121
ABSOLUTE MAXIMUM RATINGS
IN, RUN, CHRG, FA ULT, MPPT ................... –0.3V to 43V
BOOST
................................... V
SW
– 0.3V to (V
SW
+ 6V)
SW (DC)
........................................ –0.3V to (V
IN
+ 0.3V)
SW (Pulsed <100ns)
......................–1.5V to (V
IN
+ 1.5V)
CHGSNS, BAT, FB/BATSNS, FBG
................ –0.3V to 18V
FREQ, NTC, PROG, INTV
CC
.......................... –0.3V to 6V
I
CHGSNS
, I
BAT
..................................................... ±600mA
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4121EUD#PBF LTC4121EUD#TRPBF LGHC 16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
LTC4121IUD#PBF LTC4121IUD#TRPBF LGHC 16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
LTC4121EUD-4.2#PBF LTC4121EUD-4.2#TRPBF LGMV 16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
LTC4121IUD-4.2#PBF LTC4121IUD-4.2#TRPBF LGMV 16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
LTC4121 LTC4121-4.2
16 15 14 13
5 6 7 8
TOP VIEW
GND
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1INTV
CC
BOOST
IN
SW
NTC
FBG
FB
BAT
RUN
FAULT
CHRG
PROG
GND
MPPT
FREQ
CHGSNS
T
JMAX
= 125°C, θ
JA
= 54°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB TO OBTAIN θ
JA
16 15 14 13
5 6 7 8
TOP VIEW
GND
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1INTV
CC
BOOST
IN
SW
NTC
NC
BATSNS
BAT
RUN
FAULT
CHRG
PROG
GND
MPPT
FREQ
CHGSNS
T
JMAX
= 125°C, θ
JA
= 54°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB TO OBTAIN θ
JA
PIN CONFIGURATION
I
CHRG
, I
FAULT
, ........................................................±5mA
I
FB
, I
FBG
(LTC4121) .................................................±5mA
I
BATSNS
(LTC4121-4.2) ...........................................±5mA
I
INTVCC
.................................................................. –5mA
Operating Junction Temperature Range
(Note 2)
.................................................. –40°C to 125°C
Storage Temperature Range
.................... –65°C to 150°
LTC4121 Options
PART NUMBER FLOAT VOLTAGE
LTC4121 Programmable
LTC4121-4.2 4.2V Fixed
(http://www.linear.com/product/LTC4121#orderinfo)
LTC4121/LTC4121-4.2
3
4121fc
For more information www.linear.com/LTC4121
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
RUN
= 15V, V
CHGSNS
= V
BAT
= 4V, R
PROG
= 3.01k,
V
FB
= 2.29V (LTC4121), V
BATSNS
= 4V (LTC4121-4.2). Current into a pin is positive out of a pin is negative. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Input Supply Range
l
4.4 40 V
Battery Voltage Range LTC4121 (Note 3) 0 18 V
LTC4121-4.2 0 4.2 V
I
IN
DC Supply Current Switching: FREQ = GND 3.5 mA
Standby Mode: (Note 4)
l
142 260 µA
Sleep Mode: (Note 4)
LTC4121-4.2: V
BATSNS
=
4.4V
LTC4121: V
FB
= 2.51V (Note
6)
l
60
110
µA
Disabled Mode: V
SD
< V
RUN
< V
EN
(Note 4)
l
37 80 µA
Shutdown Mode: (Note 4)
l
20 40 µA
∆V
DUVLO
Differential Undervoltage Lockout V
IN
– V
BAT
Falling, V
IN
= 5V (LTC4121)
V
IN
– V
BATSNS
Falling, V
IN
= 5V (LTC4121-4.2)
l
20 80 160 mV
Hysteresis V
IN
– V
BAT
Rising, V
IN
= 5V (LTC4121)
V
IN
– V
BATSNS
Rising, V
IN
= 5V (LTC4121-4.2)
115 mV
UV
INTVCC
INTV
CC
Undervoltage Lockout (Note 5) INTV
CC
Rising, V
IN
= INTV
CC
+ 100mV
l
4.00 4.15 4.26 V
Hysteresis INTV
CC
Falling 220 mV
Battery Charger
I
BAT
BAT Standby Current Standby Mode (LTC4121) (Notes 4, 8, 9)
Standby Mode (LTC4121-4.2) (Notes 4, 8, 9)
l
l
2.5
50
4.5
1000
µA
nA
BAT Shutdown Current Shutdown Mode (LTC4121) (Notes 4, 8, 9)
Shutdown Mode (LTC4121-4.2)
(Notes 4, 8, 9)
l
l
1100
10
2000
1000
nA
nA
I
BATSNS
BATSNS Standby Current (LTC4121-4.2) Standby Mode (Notes 4, 8, 9)
l
5.4 10 µA
BATSNS Shutdown Current (LTC4121-4.2) Shutdown Mode (Notes 4, 8, 9)
l
1100 2000 nA
I
FB
Feedback Pin Bias Current (LTC4121) V
FB
= 2.5V (Note 6)
l
25 60 nA
I
FBG_LEAK
Feedback Ground Leakage Current
(LTC4121)
Shutdown Mode (Note 4)
l
1 µA
R
FBG
Feedback Ground Return Resistance
(LTC4121)
l
1000 2000 Ω
V
FB(REG)
Feedback Pin Regulation Voltage
(LTC4121)
(Note 6) 2.393 2.400 2.407 V
l
2.370 2.418 V
V
FLOAT
Regulated Float Voltage (LTC4121-4.2) 4.188 4.200 4.212 V
l
4.148 4.231 V
I
CHG
Battery Charge Current R
PROG
= 3.01k
l
383 402 421 mA
R
PROG
= 24.3k
l
45 50 55 mA
V
RCHG
Battery Recharge Threshold V
FB
Falling Relative to V
FB(REG)
(LTC4121)
l
–38 –49 –62 mV
V
RCHG_4.2
V
BATSNS
Falling Relative to V
FLOAT
(LTC4121-4.2)
l
–70 –93 –114 mV
h
PROG
Ratio of BAT Current to PROG Current V
TRKL
< V
FB
< V
FB(REG)
(LTC4121),
V
TRKL_42
< V
BATSNS
< V
FLOAT
(LTC4121-4.2)
988 mA/mA
V
PROG
PROG Pin Servo Voltage
l
1.206 1.227 1.248 V
R
SNS
CHGSNS-BAT Sense Resistor I
BAT
= –100mA 300 mΩ
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

LTC4121EUD#PBF

Mfr. #:
Buy LTC4121EUD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management 40V 400mA Sync Buck Bat Chr
Lifecycle:
New from this manufacturer.
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