LT1616ES6#TR Linear Technology, LT1616ES6#TR Datasheet

IC REG SW 1.4MHZ STEPDWN SOT23-6

LT1616ES6#TR

Manufacturer Part Number
LT1616ES6#TR
Description
IC REG SW 1.4MHZ STEPDWN SOT23-6
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LT1616ES6#TR

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3V, 5V
Current - Output
600mA
Frequency - Switching
1.4MHz
Voltage - Input
3.6 ~ 25 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-6
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
4.5V TO 25V
OFF ON
Wide Input Range: 3.6V to 25V
5V at 400mA from 7V to 25V Input
3.3V at 400mA from 4.7V to 25V Input
Fixed Frequency 1.4MHz Operation
Uses Tiny Capacitors and Inductors
Internally Compensated
Low Shutdown Current: <1 A
Low V
Tiny 6-Lead SOT-23 Package
Wall Transformer Regulation
Local Logic Supply Conversion:
Distributed Supply Regulation
Digital Cameras
Battery-Powered Equipment
12V to 5V
12V or 5V to 3.3V, 2.5V or 1.8V
V
IN
CESAT
C1: TAIYO-YUDEN TMK316BJ105
C2: TAIYO-YUDEN JMK316BJ106ML
D1: ON SEMICONDUCTOR MBR0530
D2: 1N4148
L1: SUMIDA CR43-100
C1
1 F
5
4
Switch: 220mV at 300mA
V
SHDN
IN
GND
U
2
LT1616
3.3V Step-Down Converter
BOOST
FB
SW
3
R2
10k
16.5k
1
6
R1
U
C3
0.01 F
D1
D2
10 H
L1
1616 TA01
C2
10 F
V
3.3V
300mA: V
400mA: V
OUT
IN
IN
= 4.5V TO 25V
= 4.7V TO 25V
600mA, 1.4MHz Step-Down
DESCRIPTIO
The LT
converter with internal 0.6A power switch, packaged in a
tiny 6-lead SOT-23. The wide input range of 3.6V to 25V
makes the LT1616 suitable for regulating a wide variety of
power sources, from 4-cell batteries and 5V logic rails to
unregulated wall transformers and lead-acid batteries. Its
high operating frequency allows the use of tiny, low cost
inductors and ceramic capacitors. With its internal com-
pensation eliminating additional components, a complete
400mA step-down regulator fits onto 0.15 square inches
of PC board area.
The constant frequency current mode PWM architecture
and stable operation with ceramic capacitors results in
low, predictable output ripple. Current limiting provides
protection against shorted outputs. The low current (<1 A)
shutdown provides complete output disconnect, enabling
easy power management in battery-powered systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1616 is a current mode PWM step-down DC/DC
Switching Regulator
U
100
90
80
70
60
50
40
30
0
100
LOAD CURRENT (mA)
V
IN
Efficiency
200
= 5V
V
in SOT-23
IN
V
300
= 20V
IN
= 12V
LT1616
400
1616 G02
500
1

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LT1616ES6#TR Summary of contents

Page 1

... Current limiting provides protection against shorted outputs. The low current (<1 A) shutdown provides complete output disconnect, enabling easy power management in battery-powered systems. , LTC and LT are registered trademarks of Linear Technology Corporation 0.01 F ...

Page 2

LT1616 ABSOLUTE AXI U RATI GS (Note 1) Input Voltage (V ) ................................................. 25V IN BOOST Pin Voltage ................................................. 35V BOOST Pin Above SW Pin ...................................... 25V SHDN Pin ............................................................... 25V FB Voltage ................................................................ 6V Current Into ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency OUT 100 12V 24V 100 200 300 400 500 LOAD CURRENT ...

Page 4

LT1616 W U TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0 –25 0 –50 TEMPERATURE ( CTIO S BOOST (Pin 1): The BOOST pin is used ...

Page 5

W BLOCK DIAGRA INT REG SHDN 4 AND UVLO SLOPE COMP OSC FREQUENCY FOLDBACK U OPERATIO (Refer to Block Diagram) The LT1616 is a constant frequency, current mode Buck regulator. The 1.4MHz oscillator enables an RS flip-flop, ...

Page 6

LT1616 U U APPLICATIO S I FOR ATIO The LT1616 efficiently converts power from an input volt- age source to a lower output voltage using an inductor for energy storage. The LT1616 uses its internal power switch and an external ...

Page 7

... If the inductor value is low or the load current is light, then the inductor current may become discontinuous. This occurs when I of discontinuous mode operation, see Linear Technology Application Note AN44. Also, high duty cycle operation may require slightly higher inductor values to avoid sub- harmonic oscillations ...

Page 8

LT1616 U U APPLICATIO S I FOR ATIO Table 1. Inductor Vendors Vendor Phone Murata (404) 426-1300 Sumida (847) 956-0666 Coilcraft (847) 639-6400 Coiltronics (407) 241-7876 Toko Table 2. Capacitor Vendors Vendor Phone Taiyo-Yuden (408) 573-4150 AVX (803) 448-9411 Murata ...

Page 9

U U APPLICATIO S I FOR ATIO C = 4.7 F CERAMIC, CASE SIZE 0805 OUT CERAMIC, CASE SIZE 1206 OUT ESR 0.080 (SANYO POSCAP 6TPA47M) OUT C CASE C = 100 ...

Page 10

LT1616 U U APPLICATIO S I FOR ATIO BOOST Pin Considerations Capacitor C3 and diode D2 are used to generate a boost voltage that is higher than the input voltage. In most cases a 0.01 F capacitor and fast switching ...

Page 11

U U APPLICATIO S I FOR ATIO Shorted Input Protection If the inductor is chosen so that it won’t saturate exces- sively, an LT1616 buck regulator will tolerate a shorted output. There is another situation to consider in systems where ...

Page 12

... BOOST pin. The 12V circuit shows how to overcome this limitation using an additional Zener diode. Other Linear Technology Publications Application notes AN19, AN35 and AN44 contain more detailed descriptions and design information for Buck regulators and other switching regulators ...

Page 13

U TYPICAL APPLICATIO S 16V TO 25V OFF ON 3.6V TO 12V OFF ON 12V Output BOOST IN C3 LT1616 0. SHDN SW GND 86. ...

Page 14

LT1616 U TYPICAL APPLICATIO S 3.6V TO 16V OFF 25V OFF ON 14 2.5V Output BOOST IN C3 LT1616 0. SHDN SW GND FB R1 10k 2 3 ...

Page 15

... MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ) 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. U Dimensions in inches (millimeters) unless otherwise noted ...

Page 16

... Lower Current, 100% Duty Cycle High Efficiency, No Diode Required, 8-Lead MSOP L1A 22 H • 5V 200mA 6.3V GND L1B 6.3V –5V 100mA 1616 TA06 Noise RMS Noise, 8-Lead MSOP Package RMS sn1616 1616fs LT/TP 0201 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2000 ...

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