LTC4012-2_15 Datasheet, PDF (28/28 Pages) Linear Technology – High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control

LTC4012/
LTC4012-1/LTC4012-2
Typical Application
12.6V 4 Amp Charger
FROM
ADAPTER
15V AT 4A
BULK
CHARGE
C1
R1
0.1µF
3k
D1
R7
CHRG
3
INFET
4
2
DCIN
CLP
1
CLN
20
BOOST
19
TGATE
TO/FROM
MCU
LTC4012 ₁₈
SW
5
ACP
INTV_DD ¹⁷
8
ICL
16
BGATE
6
SHDN
21
GND
12 _ITH
C2
0.1µF
15
CSP
R5
26.7k
R4
6.04k
13
PROG
C3
4.7nF
14
CSN
11
BAT
FBDIV ¹⁰
9
V_FB
Q1
R6
53.6k
R7
Q5
25mΩ
POWER TO SYSTEM
C4
0.1µF
R8
5.1k
R15
0Ω*
C5
0.1µF
Q2
D3
Q3
C6
2µF
R9 3.01k
R10 3.01k
D5
C8
10µF
D4
L1
4.7µH
R11
25mΩ
OR
R14
100k
D6
18V
ZENER
Q4
TO POWER SYSTEM LOAD
WHEN ADAPTER IS NOT
PRESENT, USE
SCHOTTKY DIODE D5 OR
THE COMBINATION OF R14,
D6 AND Q4
R12
C10
294k
10pF
R13
31.2k
C9 ⁺
10µF
12.6V
Li-Ion
BATTERY
4012 TA03
D3: CMDSH-3
D4: MBR230LSFT1
Q1: 2N7002
Q2, Q3: Si7212DN OR SiA914DJ
OR Si4816BDY (OMIT D4)
Q4, Q5: Si7423DN
L1: 1HLP-2525CZER4R7M11
*: SEE TGATE BOOST SUPPLY IN
APPLICATIONS INFORMATION
Related Parts
PART NUMBER
LTC4006
LTC4007
LTC4008/LTC4008-1
LTC4009/LTC4009-1
LTC4009-2
LTC4411
LTC4412/LTC4412HV
LTC4413
LTC4414
LTC4416
DESCRIPTION
Small, High Efficiency, Fixed Voltage, Lithium-Ion
Battery Chargers with Termination
High Efficiency, Programmable Voltage, Lithium-Ion
Battery Charger with Termination
High Efficiency, Programmable Voltage/Current Battery
Chargers
High Efficiency, Multichemistry Battery Charger
2.6A Low Loss Ideal Diode
Low Loss PowerPath Controllers
Dual 2.6A, 2.5V to 5.5V Ideal Diodes
36V, Low Loss PowerPath Controller for Large PFETs
Dual Low Loss PowerPath Controllers
COMMENTS
Complete Charger for 3- or 4-Cell Li-Ion Batteries, AC Adapter Current
Limit and Thermistor Sensor, 16-pin SSOP Package
Complete Charger for 3- or 4-Cell Li-Ion Batteries, AC Adapter Current
Limit, Thermistor Sensor and Indicator Outputs
Constant-Current/Constant-Voltage Switching Regulator, Resistor
Voltage/Current Programming, Thermistor Sensor and Indicator
Outputs, AC Adapter Current Limit (Omitted on 4008-1)
Constant-Current/Constant-Voltage Switching Regulator in a 20-Lead
QFN Package, AC Adapter Current Limit, Indicator Outputs
No External MOSFET, Automatic Switching Between DC sources, 140mΩ
On Resistance in ThinSOT^TM package
Very Low Loss Replacement for Power Supply ORing Diodes Using
Minimal External Complements, Operates up to 28V (36V for HV)
Low Loss Replacement for ORing Diodes, 100mΩ On Resistance
Low Loss Replacement for ORing Diodes, Operates up to 36V
Low Loss Replacement for ORing Diodes, Operates up to 36V, Drives
Large PFETs, Programmable, Autonomous Switching
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
4012fa
LT 0610 • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2009