Datasheet

11
LTC1155
U
SA
O
PP
L
IC
AT
ITY
P
I
CA
L
Using the Second Channel for Fault Detection Bootstrapped Gate Drive for (100Hz < F
O
< 10kHz)
5V/3A Extremely Low Voltage Drop Regulator with 10µA Standby
Current and Short-Circuit Protection
Automotive High Side Driver with Reverse-Battery
and High Voltage Transient Protection
1155 TA08
1/2
LTC1155
GND
G1
DS1
V
S
IN1
9V TO 16V
0.02Ω
5%
10µF
VALVE,
ETC.
MTP50N05E
*PROTECTS TTL/CMOS GATES DURING HIGH VOLTAGE
TRANSIENT OR REVERSE BATTERY

**NOT REQUIRED FOR INDUCTIVE OR RESISTIVE LOADS
5V
100k*
18V
1N4746A
18V
1N4746A
R
DLY
**
C
DLY
**
M
300Ω
1/4W
+
1155 TA10
LTC1155
GND
G1
DS2V
S
IN1
4.5V TO 5.5V
0.05Ω
10µF
LOAD
SMD25N05-45L
NOTE:
DRAIN SENSE 2 IS USED TO DETECT A FAULT IN CHANNEL 1. 
GATE 2 PULLS DOWN ON DRAIN SENSE 1 TO DISCHARGE 
THE MOSFET AND REPORT THE FAULT TO THE µP

*NOT REQUIRED FOR RESISTIVE OR INDUCTIVE LOADS
0.1µF*
100k
µP OR
CONTROL
LOGIC
1N4148
1N4148
30k*
IN2
G2
DS1FLT
ON/OFF
100k
+
1155 TA11
1/2
LTC1155
GND
G1
DS1
V
S
IN1
9V TO 18V
0.01Ω
IRFZ44
RISE AND FALL TIMES ARE βETA TIMES FASTER
30k
µP OR
CMOS/TTL
LOGIC
2N2222
V
GATE
= 2V
S
– 0.6V
1N41480.01µF
0.1µF
LOAD
5V
18V
2N3906
1155 TA09
1/2
LTC1155
GND
G1
DS1
V
S
IN1
5.2V TO 6V
0.02Ω
10µF
IRLR024
*CAPACITOR ESR SHOULD BE LESS THAN 0.5Ω
300k
0.1µF
ON/OFF
100k
0.1µF
200pF
10k
1
3
4
56
7
8
LT1431
5V/3A
470µF*
FAULT
+
+