LTC1478CS

Manufacturer Part NumberLTC1478CS
DescriptionIC HI-SIDE SW PROTEC DUAL 16SOIC
ManufacturerLinear Technology
TypeHigh Side
LTC1478CS datasheets

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Specifications of LTC1478CS

Input TypeNon-InvertingNumber Of Outputs2
On-state Resistance70 mOhmCurrent - Peak Output2A
Voltage - Supply2.7 V ~ 5.5 VOperating Temperature0°C ~ 70°C
Mounting TypeSurface MountPackage / Case16-SOIC (3.9mm Width)
Lead Free Status / RoHS StatusContains lead / RoHS non-compliantCurrent - Output / Channel-
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FEATURES
Extremely Low R
Switch: 0.07
DS(ON)
No Parasitic Body Diode
Built-In Short-Circuit Protection: 2A
Built-In Thermal Overload Protection
Operates from 2.7V to 5.5V
Inrush Current Limited
Ultralow Standby Current: 0.01 A
Built-In Charge Pump
Controlled Rise and Fall Times: t
Single Switch in 8-Pin SO Package
Dual Switch in Narrow 16-Pin SO Package
U
APPLICATIONS
Notebook Computer Power Management
Power Supply/Load Protection
Supply/Battery Switch-Over Circuits
Circuit Breaker Function
"Hot Swap" Board Protection
Peripheral Power Protection
W
SI PLIFIED BLOCK
DIAGRAM
V
INS
GATE CHARGE
AND
DISCHARGE
CONTROL LOGIC
CURRENT LIMIT
CHARGE
EN
AND THERMAL
PUMP
SHUTDOWN
*NMOS SWITCHES WITH NO PARASITIC BODY DIODES
Single and Dual Protected
DESCRIPTION
The LTC
provide extremely low R
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
= 1ms
voltage. (DMOS switches have parasitic body diodes that
R
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
W
V
V
V
IN1
IN2
IN3
*
*
*
V
OUT
LTC1477/1478 • TA01
LTC1477/LTC1478
High Side Switches
U
®
1477/LTC1478 protected high side switches
switching with built-in
DS(ON)
Switch Output Voltage
5.20
T
= 25 C
A
V
= V
= V
= V
= 5V
5.10
IN1
IN2
IN3
INS
5.00
4.90
4.80
4.70
4.60
0
0.25
0.5
0.75
1.00
1.25
OUTPUT CURRENT (A)
LTC1477/1478 • TP02
1.50
1

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LTC1478CS Summary of contents

  • Page 1

    ... 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. , LTC and LT are registered trademarks of Linear Technology Corporation IN1 ...

  • Page 2

    ... IN1 higher output voltages. (See Typical Performance Characteristics for further detail on output current versus output voltage). ORDER PART TOP VIEW NUMBER 16 AV OUT 15 AV IN2 LTC1478CS 14 AV IN3 13 GND 12 BEN 11 BV INS 10 BV ...

  • Page 3

    W U TYPICAL PERFORMANCE CHARACTERISTICS Supply Current (ON) 300 OUTPUT TURNED ON, NO LOAD 250 200 150 100 SUPPLY VOLTAGE (V) LTC1477/1478 • TPC01 Switch Resistance ...

  • Page 4

    LTC1477/LTC1478 PIN FUNCTIONS LTC1477 EN (Pin 4): The enable input is a high impedance CMOS gate with an ESD protection diode to ground and should not be forced below ground. This input has about 100mV of built-in ...

  • Page 5

    U OPERATION (LTC1477 or single channel of LTC1478) Input TTL-CMOS Converter The LTC1477 enable input is designed to accommodate a wide range of 3V and 5V logic families. The input threshold voltage is approximately 1.4V with 100mV of hysteresis. The ...

  • Page 6

    LTC1477/LTC1478 U U APPLICATIONS INFORMATION ing of the switch parameters to the expected load current and system current limit requirements. A couple of examples are helpful nominal load of 1A was controlled by the switch configured to ...

  • Page 7

    ... Li-Ion BATTERY PROTECTION MUST BE PROVIDED BY AN INDEPENDENT CIRCUIT Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

  • Page 8

    ... V Switch CC LTC1471 Dual 5V and 3.3V V Switch CC LTC1472 PCMCIA V and VPP Switches CC SafeSlot is a trademark of Linear Technology Corporation. Linear Technology Corporation 8 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 : (408) 434-0507 FAX TELEX U Dimension in inches (millimeters) unless otherwise noted. S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.053 – ...

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