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LT1121HVIS8#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT1121/LT1121-3.3/LT1121-5
1
1121fg
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Micropower Low Dropout
Regulators with Shutdown
The LT
®
1121/LT1121-3.3/LT1121-5 are micropower low
dropout regulators with shutdown. These devices are ca-
pable of supplying
150mA of output current with a dropout
voltage of 0.4V. Designed for use in battery-powered sys-
tems, the low quiescent current, 30µA operating and 16µA
in shutdown, makes them an ideal choice. The quiescent
current is well-controlled;
it does not rise in dropout as it
does with many other low dropout PNP regulators.
Other features of the LT1121/LT1121-3.3/LT1121-5 include
the ability to operate with very small output capacitors.
They are stable with only 0.33µF on the output while most
older devices require between 1µF and 100µF for stability.
Small ceramic capacitors can be used, enhancing manu-
facturability. Also the input may
be connected to ground
or a reverse voltage without reverse current flow from
output to input. This makes the LT1121 series ideal for
backup power situations where the output is held high and
the input is at ground or reversed. Under these conditions
only 16µA will flow from the output pin to ground.
5V Battery-Powered Supply with Shutdown
n
0.4V Dropout Voltage
n
150mA Output Current
n
30µA Quiescent Current
n
No Protection Diodes Needed
n
Adjustable Output from 3.75V to 30V
n
3.3V and 5V Fixed Output Voltages
n
Controlled Quiescent Current in Dropout
n
Shutdown
n
16µA Quiescent Current in Shutdown
n
Stable with 0.33µF Output Capacitor
n
Reverse Battery Protection
n
No Reverse Current with Input Low
n
Thermal Limiting
n
Available in the 8-Lead SO, 8-Lead PDIP, 3-Lead
SOT-23 and 3-Lead TO-92 Packages
n
Low Current Regulator
n
Regulator for Battery-Powered Systems
n
Post Regulator for Switching Supplies
Dropout Voltage
IN
OUT
LT1121-3.3
GND
3.3V
OUT
150mA
1μF
SOLID TANTALUM
5V
8
+
5
1
3
LT1121 • TA01
V
SHDN
(PIN 5)
<0.25
>2.8
NC
OUTPUT
OFF
ON
ON
SHDN
OUTPUT CURRENT (mA)
0
DROPOUT VOLTAGE (V)
0.3
0.4
0.5
60 100 160
0.2
0.1
0
20 40
80
120 140
LT1121 • TA02
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LT1121/LT1121-3.3/LT1121-5
2
1121fg
ABSOLUTE MAXIMUM RATINGS
Input Voltage
LT1121 .............................................................. ± 30V
LT1121HV ............................................... +36V, –30V
Output Pin Reverse Current
................................. 10mA
Adjust Pin Current
................................................ 10mA
Shutdown Pin Input Voltage (Note 2)
.......... 6.5V, – 0.6V
Shutdown Pin Input Current (Note 2)
.................. 20mA
(Note 1)
1
2
3
4
8
7
6
5
TOP VIEW
OUT
NC/ADJ*
GND
NC
IN
NC**
NC**
SHDN
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
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.
*
**
T
JMAX
= 150°C, θ
JA
= 120°C/W (N8, S8)
T
JMAX
= 150°C, θ
JA
= 70°C/W (AS8)
3
2
1
FRONT VIEW
TAB IS
GND
OUTPUT
GND
V
IN
ST PACKAGE
3-LEAD PLASTIC SOT-223
T
JMAX
= 150°C, θ
JA
= 50°C/W
BOTTOM VIEW
IN GND OUT
Z PACKAGE
3-LEAD PLASTIC TO-92
T
JMAX
= 150°C, θ
JA
= 150°C/W
Output Short-Circuit Duration ....................... Indefinite
Operating Junction Temperature Range (Note 3)
LT1121C-X ............................................ 0°C to 125°C
LT1121I-X ........................................ –40°C to 125°C
Storage Temperature Range
..................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
...................300°C
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1121CN8#PBF LT1121CN8#TRPBF LT1121CN8 8-Lead Plastic PDIP 0°C to 125°C
LT1121CN8-3.3#PBF LT1121CN8-3.3#TRPBF LT1121CN8-3.3 8-Lead Plastic PDIP 0°C to 125°C
LT1121CN8-5#PBF LT1121CN8-5#TRPBF LT1121CN8-5 8-Lead Plastic PDIP 0°C to 125°C
LT1121IN8#PBF LT1121IN8#TRPBF LT1121IN8 8-Lead Plastic PDIP –40°C to 125°C
LT1121IN8-3.3#PBF LT1121IN8-3.3#TRPBF LT
1121IN8-3.3 8-Lead Plastic PDIP –40°C to 125°C
LT1121IN8-5#PBF LT1121IN8-5#TRPBF LT1121IN8-5 8-Lead Plastic PDIP –40°C to 125°C
LT1121CS8#PBF LT1121CS8#TRPBF 1121 8-Lead Plastic S0 0°C to 125°C
LT1121CS8-3.3#PBF LT1121CS8-3.3#TRPBF 11213 8-Lead Plastic S0 0°C to 125°C
LT1121CS8-5#PBF LT1121CS8-5#TRPBF 11215 8-Lead Plastic S0 0°C to 125°C
LT1121HVCS8#PBF LT1121HVCS8#TRPBF 1121HV 8-Lead Plastic S0 –40°C
to 125°C
LT1121IS8#PBF LT1121IS8#TRPBF 1121I 8-Lead Plastic S0 –40°C to 125°C
LT1121IS8-3.3#PBF LT1121IS8-3.3#TRPBF 121I3 8-Lead Plastic S0 –40°C to 125°C
LT1121IS8-5#PBF LT1121IS8-5#TRPBF 121I5 8-Lead Plastic S0 –40°C to 125°C
LT1121HVIS8#PBF LT1121HVIS8#TRPBF 121HVI 8-Lead Plastic S0 –40°C to 125°C
LT1121ACS8#PBF LT1121ACS8#TRPBF 1121A 8-Lead Plastic S0 0°C to 125°C
LT1121ACS
8-3.3#PBF LT1121ACS8-3.3#TRPBF 1121A3 8-Lead Plastic S0 0°C to 125°C
LT1121ACS8-5#PBF LT1121ACS8-5#TRPBF 1121A5 8-Lead Plastic S0 0°C to 125°C
LT1121/LT1121-3.3/LT1121-5
3
1121fg
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1121AHVCS8#PBF LT1121AHVCS8#TRPBF 121AHV 8-Lead Plastic S0 0°C to 125°C
LT1121AIS8#PBF LT1121AIS8#TRPBF 121AI 8-Lead Plastic S0 –40°C to 125°C
LT1121AIS8-3.3#PBF LT1121AIS8-3.3#TRPBF 121AI3 8-Lead Plastic S0 –40°C to 125°C
LT1121AIS8-5#PBF LT1121AIS8-5#TRPBF 121AI5 8-Lead Plastic S0 –40°C to 125°C
LT1121AHVIS8#PBF LT1121AHVIS8#TRPBF 21AHVI 8-
Lead Plastic S0 –40°C to 125°C
LT1121CST-3.3#PBF LT1121CST-3.3#TRPBF 11213 3-Lead Plastic SOT-223 0°C to 125°C
LT1121IST-3.3#PBF LT1121IST-3.3#TRPBF 121I3 3-Lead Plastic SOT-223 –40°C to 125°C
LT1121CST-5#PBF LT1121CST-5#TRPBF 11215 3-Lead Plastic SOT-223 0°C to 125°C
LT1121IST-5#PBF LT1121IST-5#TRPBF 1121I5 3-Lead Plastic SOT-223 –40°C to 125°C
LT1121CZ3-3#PBF LT1121CZ3-3#TRPBF LT1121CZ3-3 3-Lead Plastic TO-92 0°
C to 125°C
LT1121IZ3-3#PBF LT1121IZ3-3#TRPBF LT1121IZ3-3 3-Lead Plastic TO-92 –40°C to 125°C
LT1121CZ-5#PBF LT1121CZ-5#TRPBF LT1121CZ-5 3-Lead Plastic TO-92 0°C to 125°C
LT1121IZ-5#PBF LT1121IZ-5#TRPBF LT1121IZ-5 3-Lead Plastic TO-92 –40°C to 125°C
Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult
LT C Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Regulated Output Voltage (Note 4) LT1121-3.3 V
IN
= 3.8V, I
OUT
= 1mA, T
J
= 25ºC
4.3V < V
IN
< 20V, 1mA < I
OUT
< 150mA
l
3.25
3.2
3.3
3.3
3.35
3.4
V
V
LT1121-5 V
IN
= 5.5V, I
OUT
= 1mA, T
J
= 25ºC
6V < V
IN
< 20V, 1mA < I
OUT
< 150mA
l
4.925
4.85
5
5
5.075
5.15
V
V
LT1121 (Note 5) V
IN
= 4.3V, I
OUT
= 1mA, T
J
= 25ºC
4.8V < V
IN
< 20V, 1mA < I
OUT
< 150mA
l
3.695
3.64
3.75
3.75
3.805
3.86
V
V
Line Regulation
LT1121-3.3 ΔV
IN
= 4.8V TO 20V, I
OUT
= 1mA
LT1121-5 ΔV
IN
= 5.5V TO 20V, I
OUT
= 1mA
LT1121 (Note 5) ΔV
IN
= 4.3V TO 20V, I
OUT
= 1mA
l
l
l
1.5
1.5
1.5
10
10
10
mV
mV
mV
Load Regulation
LT1121-3.3 ΔI
LOAD
= 1mA to 150mA, T
J
= 25ºC
ΔI
LOAD
= 1mA to 150mA
LT1121-5
ΔI
LOAD
= 1mA to 150mA, T
J
= 25ºC
ΔI
LOAD
= 1mA to 150mA
LT1121 (Note 5) ΔI
LOAD
= 1mA to 150mA, T
J
= 25ºC
ΔI
LOAD
= 1mA to 150mA
l
l
l
–12
–20
–17
–28
–12
–18
–25
–40
–35
–50
–25
–40
mV
mV
mV
mV
mV
mV
Dropout Voltage (Note 6) I
LOAD
= 1mA, T
J
= 25ºC
I
LOAD
= 1mA
l
0.13 0.16
0.25
V
V
I
LOAD
= 50mA, T
J
= 25ºC
I
LOAD
= 50mA
l
0.3 0.35
0.5
V
V
I
LOAD
= 100mA, T
J
= 25ºC
I
LOAD
= 100mA
l
0.37 0.45
0.6
V
V
I
LOAD
= 150mA, T
J
= 25ºC
I
LOAD
= 150mA
l
0.42 0.55
0.7
V
V
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1121HVIS8#TRPBF

Mfr. #:
Buy LT1121HVIS8#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators HV Adj Low Dropout uP Regulator
Lifecycle:
New from this manufacturer.
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