Datasheet

2
LT1121/LT1121-3.3/LT1121-5
Storage Temperature Range ................. – 65°C to 150°C
Operating Junction Temperature Range (Note 2)
LT1121C-X ......................................... 0°C to 125°C
LT1121I-X ..................................... –40°C to 125°C
Lead Temperature (Soldering, 10 sec)..................300°C
*For applications requiring input voltage ratings greater than 30V, contact the factory.
Input Voltage ...................................................... ±30V*
Output Pin Reverse Current ................................. 10mA
Adjust Pin Current ............................................... 10mA
Shutdown Pin Input Voltage (Note 1) ........ 6.5V, – 0.6V
Shutdown Pin Input Current (Note 1) .................. 20mA
Output Short-Circuit Duration......................... Indefinite
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Regulated Output Voltage LT1121-3.3 V
IN
= 3.8V, I
OUT
= 1mA, T
J
= 25°C 3.250 3.300 3.350 V
(Note 3) 4.3V < V
IN
< 20V, 1mA < I
OUT
< 150mA ● 3.200 3.300 3.400 V
LT1121-5 V
IN
= 5.5V, I
OUT
= 1mA, T
J
= 25°C 4.925 5.000 5.075 V
6V < V
IN
< 20V, 1mA < I
OUT
< 150mA ● 4.850 5.000 5.150 V
LT1121 (Note 4) V
IN
= 4.3V, I
OUT
= 1mA, T
J
= 25°C 3.695 3.750 3.805 V
4.8V < V
IN
< 20V, 1mA < I
OUT
< 150mA ● 3.640 3.750 3.860 V
Line Regulation LT1121-3.3 ∆V
IN
= 4.8V to 20V, I
OUT
= 1mA ● 1.5 10 mV
LT1121-5 ∆V
IN
= 5.5V to 20V, I
OUT
= 1mA ● 1.5 10 mV
LT1121 (Note 4) ∆V
IN
= 4.3V to 20V, I
OUT
= 1mA ● 1.5 10 mV
WU
U
PACKAGE
/
O
RDER I FOR ATIO
θ
JA
≈ 150°C/W
θ
JA
≈ 50°C/W
12
3
BOTTOM VIEW
IN GND OUT
Z PACKAGE
3-LEAD PLASTIC TO-92
LT1121 • PO02
3
2
1

FRONT VIEW
TAB IS
GND
OUTPUT
GND
V
IN


ST PACKAGE
3-LEAD PLASTIC SOT-223
LT1121 • PO03
ORDER PART NUMBER
ORDER PART
NUMBER
LT1121CZ-3.3
LT1121IZ-3.3
LT1121CZ-5
LT1121IZ-5
Consult factory for Military grade parts.
LT1121CN8
LT1121CN8-3.3
LT1121CN8-5
LT1121IN8
LT1121IN8-3.3
LT1121IN8-5
LT1121CS8
LT1121CS8-3.3
LT1121CS8-5
LT1121IS8
LT1121IS8-3.3
LT1121IS8-5
LT1121ACS8
LT1121ACS8-3.3
LT1121ACS8-5
LT1121AIS8
LT1121AIS8-3.3
LT1121AIS8-5
1121
11213
11215
1121I
121I3
121I5
1121A
121A3
121A5
121AI
121AI3
121AI5
LT1121CST-3.3
LT1121IST-3.3
LT1121CST-5
LT1121IST-5
S8 PART
MARKING
ORDER PART
NUMBER
1
2
3
4
8
7
6
5

TOP VIEW
OUT
NC/ADJ*
GND
NC
IN
NC**
NC**
SHDN

N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
PIN 2 = NC FOR LT1121-3.3/LT1121-5
 = ADJ FOR LT1121
PINS 6 AND 7 ARE FLOATING (NO
INTERNAL CONNECTION) ON THE
STANDARD S8 PACKAGE.
PINS 6 AND 7 CONNECTED TO GROUND
ON THE A VERSION OF THE LT1121 (S8 ONLY).
CONNECTING PINS 6 AND 7 TO THE
GROUND PLANE WILL REDUCE THERMAL
RESISTANCE. SEE THERMAL RESISTANCE
TABLES IN THE APPLICATIONS INFORMATION
SECTION.
*

**


θ
JA
≈ 120°C/W (N8, S8)
θ
JA
≈ 70°C/W (AS8)