ltc1760 Linear Technology Corporation, ltc1760 Datasheet - Page 8

• Manufacturer Part Number: ltc1760
• Description: Dual Smart Battery System Manager
• Manufacturer: Linear Technology Corporation

LTC1760
TYPICAL PERFOR A CE CHARACTERISTICS
8
PI FU CTIO S
Input Power Related
SCN (Pin 4): PowerPath Current Sensing Negative Input.
This pin should be connected directly to the “bottom”
(output side) of the low valued resistor in series with the
three PowerPath switch pairs, for detecting short-circuit
current events. Also powers the LTC1760 internal circuitry
when all other sources are absent.
SCP (Pin 5): PowerPath Current Sensing Positive Input.
This pin should be connected directly to the “top” (switch
side) of the low valued resistor in series with the three
PowerPath switch pairs, for detecting short-circuit cur-
rent events.
100
90
80
70
60
50
40
30
20
10
0
U
0
Efficiency vs Charging Current
0.025
U
0.10
I
OUT
16
15
14
13
12
11
10
9
8
7
6
–50 –40 –30
Power Path Switching 1 and 2
U
(A)
C
I
T
LOAD
A
LOAD
= 25°C
0.50
= 0.8A
= 20µF
W
–20
2.5 4.0
1760 G07
–10 0
TIME (µs)
U
10 20 30 40 50
LOPWR
THRESHOLD
14
12
10
8
6
4
2
0
–4 –2
Load Dump
1960 G10
0
DISCONNECTED
2
LOAD
CONNECTED
LOAD
4
TIME (ms)
BAT1
OUTPUT
6
GDCO (Pin 6): DCIN Output Switch Gate Drive. Together
with GDCI, this pin drives the gate of the P-channel switch
in series with the DCIN input switch.
GDCI (Pin 7): DCIN Input Switch Gate Drive. Together with
GDCO, this pin drives the gate of the P-channel switch
connected to the DCIN input.
GB1O (Pin 8): BAT1 Output Switch Gate Drive. Together
with GB1I, this pin drives the gate of the P-channel switch
in series with the BAT1 input switch.
GB1I (Pin 9): BAT1 Input Switch Gate Drive. Together with
GB1O, this pin drives the gate of the P-channel switch
connected to the BAT1 input.
V
VDAC = 12.29V
IDAC = 3000mA
LOAD CURRENT = 1A
T
A
IN
8
= 25°C
= 20V
10 12 14 16
5V
0V
SMBus Accelerator Operation
V
C
T
A
CC
LD
LTC1760
= 25°C
= 5V
= 200pF
1760 G08
R
PULLUP
1µs/DIV
12.4
12.3
12.2
12.1
12.0
11.9
11.8
11.7
11.6
= 15k
0
Load Regulation
V
VDAC = 12.288V
IDAC = 4000mA
T
A
IN
= 25°C
= 20V
1000
CHARGE CURRENT (mA)
1760 G11
2000
3000
4000
1760 G09
1760f