LTC4012-3_15 Datasheet, PDF (28/28 Pages) Linear Technology – High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control

LTC4012-3
Typical Application
12.6V 4 Amp Charger
FROM
ADAPTER
15V AT 4A
BULK
CHARGE
C1
R1
0.1µF
3k
D1
R7
CHRG
4
DCIN
R2
3
INFET
2
CLP
1
CLN
10k _{5 GND}
20
BOOST
19
TGATE
TO/FROM
MCU
LTC4012-3 ₁₈
SW
8
ICL
INTV_DD ¹⁷
16
BGATE
6
SHDN
12 _ITH
C2
21
GND
15
CSP
0.1µF
R4
6.04k
R5
26.7k
13
PROG
C3
4.7nF
Q1
R6
53.6k
14
CSN
11
BAT
FBDIV ¹⁰
9
V_FB
Q5
C4
0.1µF
R7
25mΩ
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
POWER TO SYSTEM
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, R2
D6 AND Q4
D3: CMDSH-3
D4: MBR230LSFT1
Q1: 2N7002
Q2, Q3: Si7218DN
Q4, Q5: Si7423DN
L1: 1HLP-2525CZER4R7M11
*: SEE TGATE BOOST SUPPLY IN
APPLICATIONS INFORMATION
R12
C10
294k
10pF
R13
31.2k
C9 ⁺
10µF
12.6V
Li-Ion
BATTERY
40123 TA03
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40123fb
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0610 REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2009