LTC1477 LINER [Linear Technology], LTC1477 Datasheet

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LTC1477

Manufacturer Part Number
LTC1477
Description
Single and Dual Protected High Side Switches
Manufacturer
LINER [Linear Technology]
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1477CS8#TRPBF
Manufacturer:
LINEAR
Quantity:
15 443
Company:
Part Number:
LTC1477CS8#TRPBF
Quantity:
388
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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LTC1477 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. W ...

Page 2

... IN1 V pins are typically connected to V and V IN3 INS selectively disconnected to reduce the short-circuit current limit and 2 U RATINGS Operating Temperature LTC1477C/LTC1478C .............................. Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 ORDER PART NUMBER AV 1 OUT AV ...

Page 3

... IN3 OUTPUT VOLTAGE (V) Inrush Current (3.3V) 3 CURRENT T J LIMITED 2 ALL OUT OUT OUT OUT 2.4 2.8 –0.4 0 0.4 0.8 1.2 TIME (ms) 100 125 LTC1477/1478 • TPC03 LTC1477/1478 • TPC06 = 25 C PINS = 3. 470 1.6 2.0 2.4 2.8 LTC1477/1478 • TPC09 3 ...

Page 4

... R . (See Applications Information section for more DS(ON) details.) V (Pins 1,8): The output pins of the LTC1477 must OUT always be tied together. The output is protected against accidental short circuits to ground by a current limit circuit which protects the system power supply and load against damage. A second level of protection is provided by thermal shutdown circuitry which limits the die tempera- ture to 130 C ...

Page 5

... LTC1477. The switch is protected against accidental short circuits with a current limit circuit which limits the output current to typically 2A when the output is shorted to ground. The LTC1477 also has thermal shut- down set at approximately 130 C which limits the power dissipation to safe levels. ...

Page 6

... Supply Bypassing For best results, bypass the supply input pins with a single 1.0 F capacitor as close as possible to the LTC1477. Sometimes, much larger capacitors are already available at the output of the power supply. In this case still good practice to use a 0.1 F capacitor as close as possible ...

Page 7

... SHDN LBO 5 LTC1477/LTC1478 D1 L1* MBRS130LT3 10 H 12V SENSE + 47 F LT1301 16V 0.1 F TANT LIM GND 1 DN117 • F03 5V/2A OR 3.3V/2A + 100 F 1k 10V LTC1477/1478 • TA08 OUT OUT IN1 IN2 LTC1477 INS IN3 EN GND LTC1477/1478 • TA09 7 ...

Page 8

... LTC1477/LTC1478 PACKAGE DESCRIPTION 0.010 – 0.020 45 (0.254 – 0.508) 0.008 – 0.010 0 – 8 TYP (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" ...

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