lt3028ife-trpbf Linear Technology Corporation, lt3028ife-trpbf Datasheet

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lt3028ife-trpbf

Manufacturer Part Number
lt3028ife-trpbf
Description
Dual 100ma/500ma Low Dropout, Low Noise, Micropower Regulators With Independent Inputs
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Low Noise: 20µV
Low Quiescent Current: 30µA/Output
Independent Inputs
Wide Input Voltage Range: 1.8V to 20V
Output Current: 100mA/500mA
Very Low Shutdown Current: <0.1
Low Dropout Voltage: 300mV/320mV at
100mA/500mA
Adjustable Outputs from 1.22V to 20V
Stable with as Low as 1µF/3.3µF Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
Reverse-Battery Protected
No Protection Diodes Needed
Overcurrent and Overtemperature Protected
Tracking/Sequencing Capability
Thermally Enhanced 16-Lead TSSOP and 16-Lead
(5mm × 3mm) DFN Packages
Cellular Phones
Pagers
Battery-Powered Systems
Frequency Synthesizers
Wireless Modems
Tracking/Sequencing Power Supplies
3.7V TO
2.9V TO
V
V
20V
20V
IN1
IN2
1µF
1µF
3.3V/2.5V Low Noise Regulators
U
RMS
IN1
IN2
SHDN1
SHDN2
LT3028
(10Hz to 100kHz)
GND
OUT1
BYP1
OUT2
BYP2
ADJ1
ADJ2
U
0.01µF
0.01µF
µ
A
422k
261k
249k
249k
3028 TA01a
10µF
10µF
3.3V AT 500mA
20µV
2.5V AT 100mA
20µV
RMS
RMS
NOISE
NOISE
Micropower Regulators with
DESCRIPTIO
Protected by U.S. Patents including 6118263, 6144250.
The LT
out regulator with independent inputs. With an external
0.01µF bypass capacitor, output noise is a low 20µV
over a 10Hz to 100kHz bandwidth. Designed for use in
battery-powered systems, the low 30µA quiescent current
per output makes it an ideal choice. In shutdown, quies-
cent current drops to less than 0.1µA. Shutdown control
is independent for each output, allowing for flexibility in
power management. The device is capable of operating
over an input voltage range of 1.8V to 20V. Output 1 can
supply 500mA of output current with a dropout voltage of
320mV. The device can supply 100mA of output current
from Output 2 with a dropout voltage of 300mV. Quiescent
current is well controlled in dropout.
The LT3028 regulator is stable with output capacitors as
low as 1µF for the 100mA output and 3.3µF for the 500mA
output. Small ceramic capacitors can be used without the
series resistance required by other regulators.
Internal protection circuitry includes reverse-battery pro-
tection, current limiting and thermal limiting protection.
The device is available as an adjustable device with a 1.22V
reference voltage. The LT3028 regulator is available in the
thermally enhanced 16-lead TSSOP and 16-lead, low
profile (5mm × 3mm × 0.75mm) DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Low Dropout, Low Noise,
®
3028 is a dual, micropower, low noise, low drop-
100µV/DIV
Dual 100mA/500mA
Independent Inputs
V
OUT
10Hz to 100kHz Output Noise
U
3028 TA01b
20µV
LT3028
RMS
RMS
1
3028f

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lt3028ife-trpbf Summary of contents

Page 1

... The device is available as an adjustable device with a 1.22V reference voltage. The LT3028 regulator is available in the thermally enhanced 16-lead TSSOP and 16-lead, low profile (5mm × 3mm × 0.75mm) DFN packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Protected by U.S. Patents including 6118263, 6144250. 3.3V AT 500mA 20µV ...

Page 2

... FE Package ....................................... – 65°C to 150°C DHC Package .................................... – 65°C to 125°C Lead Temperature (Soldering, 10 sec).................. 300° ORDER PART NUMBER BYP1 1 LT3028EFE NC 2 OUT1 3 LT3028IFE OUT1 4 GND 5 OUT2 6 FE PART OUT2 7 MARKING BYP2 8 3028EFE 16-LEAD (5mm × 3mm) PLASTIC DFN ...

Page 3

ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T PARAMETER CONDITIONS Dropout Voltage I = 1mA LOAD (Output 1mA LOAD 10mA IN2 OUT2(NOMINAL) ...

Page 4

LT3028 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 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Quiescent Current (Per Output SHDN 250k 5µ –50 ...

Page 6

LT3028 W U TYPICAL PERFOR A CE CHARACTERISTICS SHDN1 or SHDN2 Pin Threshold (Off-to-On) 1.0 0 FULL 0.8 L 0.7 0 1mA L 0.5 0.4 0.3 0.2 0.1 0 – 125 –25 ...

Page 7

W U TYPICAL PERFOR A CE CHARACTERISTICS Output 2 Input Ripple Rejection 10µF OUT 1µF OUT 100mA 2.3V + 50mV RIPPLE IN2 RMS 10 ...

Page 8

LT3028 W U TYPICAL PERFOR A CE CHARACTERISTICS Channel-to-Channel Isolation 100 90 CHANNEL CHANNEL GIVEN CHANNEL IS TESTED 30 WITH 50mVRMS SIGNAL ON OPPOSING CHANNEL, BOTH 20 CHANNELS DELIVERING FULL CURRENT 10 T ...

Page 9

W U TYPICAL PERFOR A CE CHARACTERISTICS 10Hz to 100kHz Output Noise C = 0pF BYP V OUT 100µV/DIV C = 10µF 1ms/DIV OUT 3028 G42 I = FULL LOAD L V SET FOR 5V OUT 10Hz to 100kHz Output ...

Page 10

LT3028 CTIO S (DFN Package)/(TSSOP Package) GND (Pins 5, 17)/(Pins 16, 17): Ground. The Exposed Pad must be soldered to PCB ground for opti- mum thermal performance. ADJ1/ADJ2 (Pins 16/9)/(Pins 15/10): ...

Page 11

U U APPLICATIO S I FOR ATIO than 1µA in shutdown. In addition to the low quiescent current, the LT3028 regulator incorporates several pro- tection features which make it ideal for use in battery- powered systems. The device is protected ...

Page 12

LT3028 U U APPLICATIO S I FOR ATIO used to bypass the reference (for low noise operation), larger values of output capacitors are needed. For 100pF of bypass capacitance on Output 2, 2.2µF of output capacitor is recommended. With a ...

Page 13

U U APPLICATIO S I FOR ATIO Voltage and temperature coefficients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the ...

Page 14

LT3028 U U APPLICATIONS INFORMATION The power dissipated by each output will be equal to – OUT(MAX) IN(MAX) OUT GND Where for Output 500mA OUT(MAX IN(MAX ...

Page 15

... DIMENSIONS ARE IN 3. DRAWING NOT TO SCALE 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. W ...

Page 16

... I < 3µA, ThinSOT Package 1.22V 40µA, I < 1µA, MS10E, DFN Packages 1.22V 30µA, I < 1µA, DFN, TSSOP Packages Q SD LT/TP 0904 1K • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2004 0.40 ± 0.10 PIN 1 NOTCH (DHC16) DFN 1103 3028f ...

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