LT1761ES5-SD Linear Technology Corporation, LT1761ES5-SD Datasheet

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LT1761ES5-SD

Manufacturer Part Number
LT1761ES5-SD
Description
100mA, low noise, LDO micropower regulators, adjustable output
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
TYPICAL APPLICATIO
5.4V TO
APPLICATIO S
20V
Tiny 5-Lead SOT-23 Package
Low Noise: 20 V
Low Quiescent Current: 20 A
Wide Input Voltage Range: 1.8V to 20V
Output Current: 100mA
Very Low Shutdown Current: < 0.1 A
Low Dropout Voltage: 300mV at 100mA
Fixed Output Voltages: 1.5V, 1.8V, 2V, 2.5V, 2.8V,
3V, 3.3V, 5V
Adjustable Output from 1.22V to 20V
Stable with 1 F Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
Reverse Battery Protected
No Reverse Current
No Protection Diodes Needed
Overcurrent and Overtemperature Protected
Cellular Phones
Pagers
Battery-Powered Systems
Frequency Synthesizers
Wireless Modems
V
IN
1 F
5V Low Noise Regulator
U
RMS
IN
SHDN
LT1761-5
(10Hz to 100kHz)
GND
OUT
BYP
U
0.01 F
+
10 F
5V AT100mA
20 V
RMS
NOISE
1761 TA01
DESCRIPTIO
The LT
dropout regulators. With an external 0.01 F bypass
capacitor, output noise drops to 20 V
100kHz bandwidth. Designed for use in battery-powered
systems, the low 20 A quiescent current makes them an
ideal choice. In shutdown, quiescent current drops to less
than 0.1 A. The devices are capable of operating over an
input voltage from 1.8V to 20V, and can supply 100mA of
output current with a dropout voltage of 300mV. Quies-
cent current is well controlled, not rising in dropout as it
does with many other regulators.
The LT1761 regulators are stable with output capacitors
as low as 1 F. Small ceramic capacitors can be used
without the series resistance required by other regulators.
Internal protection circuitry includes reverse battery pro-
tection, current limiting, thermal limiting and reverse
current protection. The device is available in fixed output
voltages of 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V and 5V,
and as an adjustable device with a 1.22V reference voltage.
The LT1761 regulators are available in the 5-lead SOT-23
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
100 V/DIV
®
1761 series are micropower, low noise, low
V
OUT
Regulators in SOT-23
100mA, Low Noise,
10Hz to 100kHz Output Noise
U
LDO Micropower
LT1761 Series
RMS
1761 G48
over a 10Hz to
20 V
RMS
1

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LT1761ES5-SD Summary of contents

Page 1

... The device is available in fixed output voltages of 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V and 5V, and as an adjustable device with a 1.22V reference voltage. The LT1761 regulators are available in the 5-lead SOT-23 package. , LTC and LT are registered trademarks of Linear Technology Corporation. 5V AT100mA 20 V NOISE + RMS 0 ...

Page 2

... GND 2 SHDN 3 4 ADJ S5 PACKAGE 5-LEAD PLASTIC SOT- 150 C, = 250 C/ W JMAX JA SEE THE APPLICATIONS INFORMATION SECTION. S5 PART ORDER PART MARKING NUMBER LTGH LT1761ES5-SD = 100mA 1mA IN LOAD 2.5V < V < 20V, 1mA < I < 50mA IN LOAD 2.5V < V < 20V, 1mA < I < 100mA IN ...

Page 3

ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are T PARAMETER CONDITIONS Regulated Output Voltage LT1761-2.8 (Note 4) LT1761-3 LT1761-3.3 LT1761-5 ADJ Pin Voltage LT1761 (Note 3, 4) Line Regulation LT1761-1.5 LT1761-1.8 LT1761-2 ...

Page 4

LT1761 Series ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are T PARAMETER CONDITIONS Load Regulation LT1761-3.3 LT1761-5 LT1761 (Note 3) V Dropout Voltage I = 1mA LOAD ...

Page 5

ELECTRICAL CHARACTERISTICS Note 4: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range ...

Page 6

LT1761 Series W U TYPICAL PERFOR A CE CHARACTERISTICS LT1761-2 Output Voltage 2. 1mA L 2.03 2.02 2.01 2.00 1.99 1.98 1.97 1.96 –50 – 100 125 TEMPERATURE ( C) 1761 G07 LT1761-3 Output ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS LT1761-2 Quiescent Current 200 175 150 125 100 SHDN SHDN ...

Page 8

LT1761 Series W U TYPICAL PERFOR A CE CHARACTERISTICS LT1761-2 GND Pin Current 2. 2.25 *FOR OUT 2. 1. 100mA* L 1.50 1. ...

Page 9

W U TYPICAL PERFOR A CE CHARACTERISTICS SHDN Pin Threshold (Off-to-On) 1.0 0 100mA 0.8 L 0.7 0 1mA L 0.5 0.4 0.3 0.2 0.1 0 –50 – 100 125 TEMPERATURE ( ...

Page 10

LT1761 Series W U TYPICAL PERFOR A CE CHARACTERISTICS LT1761-5 Input Ripple Rejection 0.01 F BYP 1000pF BYP 100pF 40 BYP 100mA ...

Page 11

W U TYPICAL PERFOR A CE CHARACTERISTICS RMS Output Noise vs Load Current (10Hz to 11kHz) 160 OUT 140 BYP C = 0.01 F BYP LT1761-5 120 100 80 LT1761-BYP 60 40 LT1761-5 ...

Page 12

LT1761 Series CTIO S IN (Pin 1): Input. Power is supplied to the device through the IN pin. A bypass capacitor is required on this pin if the device is more than six inches away ...

Page 13

U U APPLICATIO S I FOR ATIO equal to 1.22V/R1 and the current the current in R1 plus the ADJ pin bias current. The ADJ pin bias current, 30nA flows through R2 into the ...

Page 14

LT1761 Series U U APPLICATIO S I FOR ATIO dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are good for providing high capacitances in a small package, but exhibit strong voltage and tem- perature coefficients ...

Page 15

U U APPLICATIONS INFORMATION and its copper traces. Copper board stiffeners and plated through-holes can also be used to spread the heat gener- ated by power devices. The following table lists thermal resistance for several different board sizes and copper ...

Page 16

... Low Noise, Fast Transient Response LDO LT1764 3A, Low Noise, Fast Transient Response LDO LTC3404 High Efficiency Synchronous Step-Down Switching Regulator 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 www.linear-tech.com backup battery or a second regulator circuit ...

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