Datasheet

LTC1760
9
1760fa
Efficiency vs Charging Current Load Dump
Load Regulation
TYPICAL PERFORMANCE CHARACTERISTICS
PowerPath Switching 1 and 2 SMBus Accelerator Operation
I
OUT
(A)
0
0
EFFICIENCY (%)
10
30
40
50
100
70
0.025
0.10
1760 G07
20
80
90
60
0.50
2.5 4.0
TIME (ms)
–4 –2
BAT1 VOLTAGE (V)
14
12
10
8
6
4
2
0
1760 G08
42
10 12 14 16
0
68
V
IN
= 20V
V
DAC
= 12.29V
I
DAC
= 3000mA
LOAD CURRENT = 1A
T
A
= 25°C
BAT1
OUTPUT
LOAD
CONNECTED
LOAD
DISCONNECTED
CHARGE CURRENT (mA)
0
BAT1 VOLTAGE (V)
4000
1760 G09
1000 2000 3000
12.4
12.3
12.2
12.1
12.0
11.9
11.8
11.7
11.6
V
IN
= 20V
V
DAC
= 12.288V
I
DAC
= 4000mA
T
A
= 25°C
TIME (μs)
16
15
14
13
12
11
10
9
8
7
6
LOAD VOLTAGE (V)
1960 G10
–50 –40 –30
–10
0
10 20 30 40 50
–20
C
LOAD
= 20F
I
LOAD
= 0.8A
T
A
= 25°C
LOPWR
THRESHOLD
1μs/DIV
1760 G11
5V
0V
R
PULLUP
= 15k
LTC1760
V
CC
= 5V
C
LD
= 200pF
T
A
= 25°C
PIN FUNCTIONS
Input Power Related
SCN (Pin 4): PowerPath Current Sensing Negative Input.
This pin should be connected directly to the “bottom”
(output side) of the sense resistor, R
SC
, 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 sense resistor, R
SC
, in series with the three
PowerPath switch pairs, for detecting short-circuit cur-
rent events.
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.