LTC4125
28
4125f
For more information www.linear.com/LTC4125
LINEAR TECHNOLOGY CORPORATION 2015
LT 1115 • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC4125
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
AN138 Wireless Power User Guide
LTC4120 Wireless Power Receiver and 400mA
Buck Battery Charger
Wireless 1 to 2 Cell Li-Ion Charger, 400mA Charge Current, Dynamic Harmonization Control,
Wide Input Range: 12.5V to 40V, 3mm × 3mm QFN-16 Package.
LTC4070 Li-Ion/Polymer Shunt Battery Charger
System
Low Operating Current (450nA), 1% Float Voltage Accuracy Over Full Temperature and Shunt
Current Range, 50mA Maximum Internal Shunt Current (500mA with External PFET), Pin
Selectable Float Voltages: 4.0V, 4.1V, 4.2V. Ultralow Power Pulsed NTC Float Conditioning for
Li-Ion/Polymer Protection, 8-Lead (2mm × 3mm) DFN and MSOP.
LTC4071 Li-Ion/Polymer Shunt Battery Charger
System with Low Battery Disconnect
Integrated Pack Protection, <10nA Low Battery Disconnect Protects Battery from Over-
Discharge. Low Operating Current (550nA), 1% Float Voltage Accuracy Over Full Temperature
and Shunt Current Range, 50mA Maximum Internal Shunt Current, Pin Selectable Float
Voltages: 4.0V, 4.1V, 4.2V. Ultralow Power Pulsed NTC Float Conditioning for Li-Ion/Polymer
Protection, 8-Lead (2mm × 3mm) DFN and MSOP.
LT3652HV Power Tracking 2A Battery Charger Input Supply Voltage Regulation Loop for Peak Power Tracking in (MPPT) Solar Applications
Standalone, V
IN
: 4.95V to 34V (40V ABSMAX), 1MHz, 2A Charge Current, V
OUT
: 3.3V to 18V,
Timer or C/10 Termination, 12-Lead 3mm x 3mm DFN and MSOP.
C
TX
100nF
33nF
DTH
FTH
PTHM
IS
–
IS
+
PTH1
PTH2
EN
NTC
SW1
SW2
FB
LTC4120-4.2
59.0k 8.45k4.32k
100k 100k
2.21k
470pF
10nF
10nF
1µF
47µF
x 2
10.2k
100mΩ
4.7nF
0.1µF
C
FB1
0.1µF
DC1
D
FB
D
STAT
100k
100V
150k
7.68k
L
TX
24µH
L
RX
47µH
DR2
DR1
V
IN
V
IN
100k
4V
TO
5.5V
10k
10k
+
SINGLE
CELL
Li-Ion
BATTERY
PACK
10µF
10nF
47µF
24.9k
2.2µF
DFLZ30
R
NTCRX
R
NTCTX
L1
15µH
6.04k
D
C
R
C
1k
M1
4125 TA03
LTC4125
FAULT
CHRG
DHC
BOOST
SW
CHGSNS
BAT
BATSNS
NTC
PROG GND FREQ INTV
CC
IMON CTD CTS GND
STATIN IN1 IN2
RUN IN
L
TX
: WT505090-20K2-A10-G
C
TX
: C3216C0G2A104J160AC
C
FB1
: HMK107BJ104KA-T
DC1: CDBQR70
D
STAT
: LTST-C193KGKT-5A
D
FB
: BAS521-7
R
NTCTX
: NTHS0603N02N1002J
RED INDICATES HIGH VOLTAGE PARTS
DR1, DR2, DR3: DFLS240L
D
C
: BZT52C13
M1: Si7308DN
QR1: PMBT3904M
R
NTCRX
: NTHS0402N02N1002F
L
RX
: PCB COIL AND FERRITE: B67410-A0223-X195
OR 760308101303
L1: LPS4018-153ML
QR1
AIR GAP
3mm
TO
10mm
412k 1.4M
LTC4125 Driving a 24μH Transmit Coil at 103kHz, with 530mA Input Current Threshold, 119kHz
Frequency Limit and 41.5°C Transmit Coil Surface Temperature Limit in a Wireless Power System
with LTC4120 as a 200mA Single Cell Li-Ion Battery Charger at the Receiver
