LTC1760(2003) データシートの表示（PDF） - Linear Technology
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LTC1760 Datasheet PDF : 44 Pages
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LTC1760
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Charging Current
100
90
80
70
60
50
40
30
20
10
0
0
0.025 0.10 0.50
2.5 4.0
IOUT (A)
1760 G07
Load Dump
14
12
10
8
BAT1
OUTPUT
VIN = 20V
VDAC = 12.29V
IDAC = 3000mA
LOAD CURRENT = 1A
TA = 25°C
6
LOAD
CONNECTED
4
2
LOAD
DISCONNECTED
0
–4 –2 0 2 4 6 8 10 12 14 16
TIME (ms)
1760 G08
Load Regulation
12.4
12.3
12.2
12.1
12.0
11.9
11.8 VIN = 20V
VDAC = 12.288V
11.7 IDAC = 4000mA
TA = 25°C
11.6
0
1000 2000
3000
CHARGE CURRENT (mA)
4000
1760 G09
Power Path Switching 1 and 2
16
CLOAD = 20µF
15 ILOAD = 0.8A
14 TA = 25°C
13
12
11
10
9
LOPWR
8
THRESHOLD
7
6
–50 –40 –30 –20 –10 0 10 20 30 40 50
TIME (µs)
1960 G10
SMBus Accelerator Operation
VCC = 5V
5V CLD = 200pF
TA = 25°C
LTC1760
RPULLUP = 15k
0V
1µs/DIV
1760 G11
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.
8
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.
1760f
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