LT1121AIS8#TRPBF Linear Technology, LT1121AIS8#TRPBF Datasheet

IC REG LDO ADJ 150MA 8-SOIC

LT1121AIS8#TRPBF

Manufacturer Part Number
LT1121AIS8#TRPBF
Description
IC REG LDO ADJ 150MA 8-SOIC
Manufacturer
Linear Technology
Datasheet

Specifications of LT1121AIS8#TRPBF

Regulator Topology
Positive Adjustable
Voltage - Output
3.75 ~ 30 V
Voltage - Input
4.17 ~ 30 V
Voltage - Dropout (typical)
0.42V @ 150mA
Number Of Regulators
1
Current - Output
150mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-

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LT
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LT1121AIS8#TRPBFLT1121AIS8-3.3
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LT
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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
0.4V Dropout Voltage
150mA Output Current
30μA Quiescent Current
No Protection Diodes Needed
Adjustable Output from 3.75V to 30V
3.3V and 5V Fixed Output Voltages
Controlled Quiescent Current in Dropout
Shutdown
16μA Quiescent Current in Shutdown
Stable with 0.33μF Output Capacitor
Reverse Battery Protection
No Reverse Current with Input Low
Thermal Limiting
Available in the 8-Lead SO, 8-Lead PDIP , 3-Lead
SOT-23 and 3-Lead TO-92 Packages
Low Current Regulator
Regulator for Battery-Powered Systems
Post Regulator for Switching Supplies
5V
5V Battery-Powered Supply with Shutdown
V
8
5
SHDN
IN
SHDN
<0.25
>2.8
NC
LT1121-3.3
(PIN 5)
GND
3
OUTPUT
OUT
OFF
ON
ON
1
LT1121 • TA01
+
1μF
SOLID TANTALUM
3.3V
150mA
OUT
DESCRIPTION
The LT
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 manufactur-
ability. Also the input may be connected to ground or a
reverse voltage without reverse current fl ow 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 fl ow from the output pin to ground.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT1121/LT1121-3.3/LT1121-5
Regulators with Shutdown
Micropower Low Dropout
®
1121/LT1121-3.3/LT1121-5 are micropower low
0.5
0.4
0.3
0.2
0.1
0
0
20
Dropout Voltage
40
OUTPUT CURRENT (mA)
60
80
100
120 140
LT1121 • TA02
160
1121ff
1

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LT1121AIS8#TRPBF Summary of contents

Page 1

... Under these conditions only 16μA will fl ow from the output pin to ground. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 3.3V ...

Page 2

LT1121/LT1121-3.3/LT1121-5 ABSOLUTE MAXIMUM RATINGS (Note 1) 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 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T PARAMETER CONDITIONS Regulated Output Voltage (Note 4) LT1121-3.3 LT1121-5 LT1121 (Note 5) Line Regulation LT1121-3.3 LT1121-5 LT1121 (Note 5) ΔV Load Regulation LT1121-3.3 LT1121-5 LT1121 (Note 5) ΔI Dropout Voltage ...

Page 4

LT1121/LT1121-3.3/LT1121-5 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS LT1121-3.3 Quiescent Current 120 T = 25°C J ∞ LOAD 100 OPEN SHDN SHDN INPUT ...

Page 6

LT1121/LT1121-3.3/LT1121-5 TYPICAL PERFORMANCE CHARACTERISTICS LT1121-3.3 Ground Pin Current 25° 22Ω LOAD 150mA* LOAD 33Ω LOAD 100mA* LOAD 66Ω LOAD ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Reverse Output Current (LT1121-5) OUT V = 3.3V (LT1121-3.3) 25 OUT V = 3.8V (LT1121) OUT – –25 100 TEMPERATURE ...

Page 8

LT1121/LT1121-3.3/LT1121-5 PIN FUNCTIONS Input Pin: Power is supplied to the device through the input pin. The input pin should be bypassed to ground if the device is more than six inches away from the main input fi lter capacitor. In ...

Page 9

APPLICATIONS INFORMATION The LT1121 is a micropower low dropout regulator with shutdown, capable of supplying up to 150mA of output current at a dropout voltage of 0.4V. The device operates with very low quiescent current (30μA). In shutdown the quiescent ...

Page 10

LT1121/LT1121-3.3/LT1121-5 APPLICATIONS INFORMATION taken in still air, on 3/32" FR-4 board with 1oz copper. All NC leads were connected to the ground plane. Table 1. N8 Package* COPPER AREA TOPSIDE BACKSIDE BOARD AREA 2500 sq mm 2500 sq mm 2500 ...

Page 11

APPLICATIONS INFORMATION resistor is shown in Table 6. The LT1121 is a micropower device and output transient response will be a function of output capacitance. See the Transient Response curves in the Typical Performance Characteristics. Larger values of output capacitance ...

Page 12

LT1121/LT1121-3.3/LT1121-5 APPLICATIONS INFORMATION When the input of the LT1121 is forced to a voltage below its nominal output voltage and its output is held high, the reverse output current will still follow the curve in Figure 2. This condition can ...

Page 13

PACKAGE DESCRIPTION .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT ...

Page 14

LT1121/LT1121-3.3/LT1121-5 PACKAGE DESCRIPTION .264 – .287 (6.70 – 7.30) .130 – .146 (3.30 – 3.71) .0905 (2.30) BSC .071 (1.80) MAX 14 ST Package 8-Lead Plastic SOT-223 (LTC DWG # 05-08-1630) .248 – .264 (6.30 – 6.71) .114 – .124 ...

Page 15

... NOM 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LT1121/LT1121-3.3/LT1121-5 Z Package 8-Lead Plastic TO-92 (Similar to TO-226) (LTC DWG # 05-08-1510) .180 ± ...

Page 16

... LT1764 Series 3A Fast Transient Response LDO LT1962 Series 300mA, Low Noise, LDO Micropower Regulator LT1963 Series 1.5A Fast Transient Response LDO Burst Mode is a trademark of Linear Technology Corporation. Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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