LTC1478 查看數據表（PDF） - Linear Technology
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LTC1478 Datasheet PDF : 8 Pages
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LTC1477/LTC1478
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .......................................................... 7V
Enable Input Voltage ...................... (7V) to (GND – 0.3V)
Output Voltage (OFF) (Note 1) ....... (7V) to (GND – 0.3V)
Output Short-Circuit Duration .......................... Indefinite
Junction Temperature........................................... 110°C
Operating Temperature
LTC1477C/LTC1478C .............................. 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
VOUT 1
VIN1 2
VINS 3
EN 4
8 VOUT
7 VIN2
6 VIN3
5 GND
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 110°C, θJA = 120°C/ W
ORDER PART
NUMBER
LTC1477CS8
S8 PART MARKING
1477
Consult factory for Industrial and Military grade parts.
TOP VIEW
AVOUT 1
AVIN 2
AVINS 3
AEN 4
GND 5
BVIN3 6
BVIN2 7
BVOUT 8
16 AVOUT
15 AVIN2
14 AVIN3
13 GND
12 BEN
11 BVINS
10 BVIN1
9 BVOUT
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 110°C, θJA = 100°C/ W
ORDER PART
NUMBER
LTC1478CS
ELECTRICAL CHARACTERISTICS
VINS = VIN1 = VIN2 = VIN3 = 5V (Note 2), TA = 25°C, unless otherwise noted. Each channel of the LTC1478 is tested separately (Note 3).
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Supply Voltage Range
2.7
5.5
V
IVIN
Supply Current
Switch OFF, Enable = 0V
Switch ON, Enable = 5V, VIN = 5V
Switch ON, Enable = 3.3V, VIN = 3.3V
q
0.01
10
µA
q
120
180
µA
q
80
120
µA
RON
ON Resistance
VINS = VIN1 = VIN2 = VIN3 = 5V, IOUT = 1A
VINS = VIN1 = VIN2 = VIN3 = 3.3V, IOUT = 1A
VINS = VIN1 = 5V, VIN2 = VIN3 = NC, IOUT = 0.5A
VINS = VIN1 = 3.3V, VIN2 = VIN3 = NC, IOUT = 0.5A
0.07
0.12
Ω
0.08
0.12
Ω
0.12
0.20
Ω
0.13
0.20
Ω
ILKG Output Leakage Current OFF Switch OFF, Enable = 0V
q
±20
µA
ISC
Short-Circuit Current Limit VINS = VIN1 = VIN2 = VIN3 = 5V, VOUT = 0V, (Note 4)
1.60
2.00
2.40
A
VINS = VIN1 = 5V, VIN2 = VIN3 = NC, VOUT = 0V, (Note 4)
0.68
0.85
1.02
A
VENH Enable Input High Voltage 3.0V ≤ VINS ≤ 5.5V
q 2.0
V
VENL Enable Input Low Voltage
3.0V ≤ VINS ≤ 5.5V
q
0.8
V
IEN
Enable Input Current
0V ≤ VEN ≤ 5.5V
q
±1
µA
tD+R Delay and Rise Time
ROUT = 100Ω, COUT = 1µF, to 90% of Final Value
0.50
1.00
2.00
ms
The q denotes specifications which apply over the full operating
temperature range.
increase the ON resistance of the switch. The LTC1478 GND pins must be
connected together. (See Pin Functions and Block Diagram for more detail.)
Note 1: The VOUT pins must be connected together.
Note 2: The VINS and VIN1 pins must be connected together. The VIN2 and
VIN3 pins are typically connected to VINS and VIN1 pins but can be
selectively disconnected to reduce the short-circuit current limit and
Note 3: Other channel turned OFF, i.e. AEN and BEN = 0V.
Note 4: The output is protected with fold-back current limit which reduces
the short-circuit (0V) currents below peak permissible current levels at
higher output voltages. (See Typical Performance Characteristics for
further detail on output current versus output voltage).
2
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