LTC1478CS#TR Linear Technology, LTC1478CS#TR Datasheet

IC SWTCH PROT HISIDE DUAL 16SOIC

LTC1478CS#TR

Manufacturer Part Number
LTC1478CS#TR
Description
IC SWTCH PROT HISIDE DUAL 16SOIC
Manufacturer
Linear Technology
Type
High Sider
Datasheet

Specifications of LTC1478CS#TR

Input Type
Non-Inverting
Number Of Outputs
2
On-state Resistance
70 mOhm
Current - Peak Output
2A
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Output / Channel
-

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Quantity
Price
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Part Number:
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Manufacturer:
LT
Quantity:
992
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APPLICATIONS
SI PLIFIED BLOCK
FEATURES
EN
W
Extremely Low R
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
Notebook Computer Power Management
Power Supply/Load Protection
Supply/Battery Switch-Over Circuits
Circuit Breaker Function
"Hot Swap" Board Protection
Peripheral Power Protection
CONTROL LOGIC
GATE CHARGE
DISCHARGE
CHARGE
PUMP
AND
*NMOS SWITCHES WITH NO PARASITIC BODY DIODES
V
U
INS
DS(ON)
CURRENT LIMIT
AND THERMAL
SHUTDOWN
Switch: 0.07
DIAGRAM
V
*
R
IN1
= 1ms
V
*
IN2
W
V
*
IN3
LTC1477/1478 • TA01
V
OUT
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
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1477/LTC1478 protected high side switches
5.20
5.10
4.70
4.60
5.00
4.90
4.80
0
High Side Switches
T
V
A
IN1
U
0.25
= 25 C
Switch Output Voltage
= V
IN2
LTC1477/LTC1478
OUTPUT CURRENT (A)
0.5
= V
DS(ON)
IN3
0.75
= V
INS
switching with built-in
= 5V
1.00
LTC1477/1478 • TP02
1.25
1.50
1

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LTC1478CS#TR 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

LTC1477/LTC1478 ABSOLUTE MAXIMUM 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 U ...

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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