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參數(shù)資料
| 型號： | LTC1478 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low-Power LinCMOS(TM) Dual Comparator 8-CDIP -55 to 125 |
| 中文描述： | 單和雙保護高邊開關(guān) |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 224K |
| 代理商： | LTC1478 |
1
LTC1477/LTC1478
The LTC
1477/LTC1478 protected high side switches
provide extremely low R
DS(ON)
switching with built-in
protection against short-circuit and thermal overload con-
ditions. A built-in charge pump generates gate drive
higher than the supply voltage to fully enhance the internal
NMOS switch. This switch has no parasitic body diode and
therefore no current flows through the switch when it is
turned off and the output is forced above the input supply
voltage. (DMOS switches have parasitic body diodes that
become forward biased under these conditions.)
Two levels of protection are provided by the
LTC1477/LTC1478. The first level of protection is short-
circuit current limit which is set at 2A. The short-circuit
current can be reduced to as low as 0.85A by disconnect-
ing portions of the power device (see Applications Infor-
mation). The second level of protection is provided by
thermal overload protection which limits the die tempera-
ture to approximately 130
°
C.
The LTC1477 single is available in 8-lead SO packaging.
The LTC1478 dual is available in 16-lead SO packaging.
Single and Dual Protected
High Side Switches
FEATURES
I
Extremely Low R
DS(ON)
Switch: 0.07
I
No Parasitic Body Diode
I
Built-In Short-Circuit Protection: 2A
I
Built-In Thermal Overload Protection
I
Operates from 2.7V to 5.5V
I
Inrush Current Limited
I
Ultralow Standby Current: 0.01
μ
A
I
Built-In Charge Pump
I
Controlled Rise and Fall Times: t
R
= 1ms
I
Single Switch in 8-Pin SO Package
I
Dual Switch in Narrow 16-Pin SO Package
DESCRIPTIO
N
U
CHARGE
PUMP
GATE CHARGE
AND
DISCHARGE
CONTROL LOGIC
CURRENT LIMIT
AND THERMAL
SHUTDOWN
EN
V
INS
V
IN1
V
IN2
V
IN3
V
OUT
LTC1477/1478 TA01
*
*
*
*NMOS SWITCHES WITH NO PARASITIC BODY DIODES
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
Notebook Computer Power Management
I
Power Supply/Load Protection
I
Supply/Battery Switch-Over Circuits
I
Circuit Breaker Function
I
"Hot Swap" Board Protection
I
Peripheral Power Protection
APPLICATIO
S
U
Switch Output Voltage
OUTPUT CURRENT (A)
0
4.60
O
4.70
4.80
4.90
5.00
5.20
0.25
0.5
0.75
1.00
LTC1477/1478 TP02
1.25
1.50
5.10
T
A
= 25
°
C
V
IN1
= V
IN2
= V
IN3
= V
INS
= 5V
SW
M
W
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| LTC1480C | Quad General Purpose LinCMOS(TM) Differential Comparator 14-SOIC |
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