LTC4008_15 Datasheet, PDF (8/24 Pages) Linear Technology – 4A, High Effi ciency, Multi-Chemistry Battery Charger

LTC4008
BLOCK DIAGRAM
0.1μF
V_IN
Q3
DCIN
1
INFET*
20
5.8V
*
–
*NOT USED IN THE LTC4008-1
* _{+ CLP}
ACP/SHDN 3
FAULT 5
CONTROL
BLOCK
OSCILLATOR
TBAD
THERMISTOR
4 ^{RT 150k}
NTC ^32.4k
8
FLAG 14
0.47μF
10k
NTC
C/10
– 397mV
+
GND
6
35mV
11.67μA
BATMON
13
BAT ^3k
12
V_FB
7
1.19V
+
EA
–
g_m = 1m
R_SENSE
20μF
CA1
CSP ^3k
11
R_CL ^0.1μF
5k
CLP
16
–
100mV
CL1
CLN
15
+
g_m = 1.4m
I_CL 2
DCIN
OSCILLATOR
WATCHDOG
20μF
DETECT t_OFF
+
OV
1.28V –
CLP
TGATE
Q1
17
S
Q
R
BGATE
Q2
19
PGND
18
PWM CHARGE
LOGIC
L1
9k
g_m = 1m
CA2
1.19V
BUFFERED I_TH
÷5
I_TH
9
6K
0.12μF
–+
I_CMP
I_REV
17mV
PROG
10
4.7nF
R_PROG
26.7k
4008 BD
4008fb
8