LTC4100 Linear Technology, LTC4100 Datasheet - Page 7

• Manufacturer Part Number: LTC4100
• Description: Smart Battery Charger Controller
• Manufacturer: Linear Technology

BLOCK DIAGRA
PI FU CTIO S
CLN (Pin 23): Negative Input to the Input Current Limiting
Circuit Block. If no current limit function is desired, con-
nect this pin to CLP. The threshold is set at 100mV below
the voltage at the CLP pin. When used to limit supply
current, a filter is needed to filter out the switching noise.
TEST CIRCUIT
U
U
V
IN
Q1
SW
R
CL
V
BAT
L1
D1
100
U
Q2
Q3
0.1 F
0.01 F
20 F
SMBALERT
W
CHGEN
BGATE
TGATE
PGND
INFET
DCIN
V
GND
CLN
SDA
THA
THB
CLP
SCL
SET
CSP
18
12
23
24
16
15
1
3
2
5
4
6
7
8
9
CLP
BAT V
–
+
WATCHDOG
DCIN
DETECT t
OSCILLATOR
5.8V
SET
10 A
LOGIC
PWM
11-BIT
ON
V
AND CONTROL
THERMISTER
DAC
1.28V
1.19V
V
INTERFACE
INTERFACE
1.19V
DD
100mV
SMBus
LT1055
+
–
–
+
+
–
V
Q
CL1
EA
EA
DAC
S
R
–
+
gm = 1.5m
gm = 1m
Figure 2.
0V
CLP
I
LTC4100
TH
CLP (Pin 24): Positive Input to the Input Current Limiting
Circuit Block. This pin also serves as a power supply for
the IC. Bypass to ground with a 1 F capacitor.
4100 TC01
0.6V
gm = 1m
I
CMP
I
REV
V
5
CA1
BUFFERED
TOL
+
+
–
–
I
DECODER
TH
LIMIT
–
+
–
+
+
–
DCIN
V
FOR V
10-BIT
BAT
I
DAC
1.19V
1.2V
V
17mV
3k
VDAC
9k
–
VDAC
V
21
VDAC
V
22
21
20
19
10
11
17 V
13
14
R
17 56 0 44 0
BAT
CSP
I
I
ACP
DCDIV
I
V
SENSE
DC
TH
LIM
•
DD
LIM
100
.
R
SW
VLIM
V x A
(
20 F
R
ILIM
V
IN
V
BAT
)
LTC4100
sn4100 4100is
7