LTC3406ES5 Linear Technology Corporation, LTC3406ES5 Datasheet

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LTC3406ES5

Manufacturer Part Number
LTC3406ES5
Description
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
TO 5.5V
High Efficiency: Up to 96%
Very Low Quiescent Current: Only 20 A
During Operation
600mA Output Current
2.5V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws 1 A Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) ThinSOT
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
2.7V
V
IN
Figure 1a. High Efficiency Step-Down Converter
C
4.7 F
CER
IN
**
**
*
MURATA LQH32CN2R2M33
TAIYO YUDEN JMK212BJ475MG
TAIYO YUDEN JMK316BJ106ML
4
1
U
V
RUN
LTC3406-1.8
IN
GND
2
V
OUT
SW
3
5
TM
2.2 H*
Package
U
3406 F01a
C
10 F
CER
OUT
V
1.8V
600mA
OUT
DESCRIPTIO
The LTC
nous buck regulator using a constant frequency, current
mode architecture. The device is available in an adjustable
version and fixed output voltages of 1.5V and 1.8V. Supply
current during operation is only 20 A and drops to 1 A
in shutdown. The 2.5V to 5.5V input voltage range makes
the LTC3406 ideally suited for single Li-Ion battery-pow-
ered applications. 100% duty cycle provides low dropout
operation, extending battery life in portable systems.
Automatic Burst Mode
light loads, further extending battery life.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. The LTC3406 is available in a low
profile (1mm) ThinSOT package.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Synchronous Step-Down
®
3406 is a high efficiency monolithic synchro-
95
90
85
80
75
70
65
60
Figure 1b. Efficiency vs Load Current
0.1
LTC3406-1.5/LTC3406-1.8
Regulator in ThinSOT
V
IN
V
= 2.7V
IN
U
1
OUTPUT CURRENT (mA)
= 4.2V
®
V
1.5MHz, 600mA
operation increases efficiency at
IN
= 3.6V
10
100
V
OUT
= 1.8V
3406 F01b
1000
LTC3406
sn3406 3406fs
1

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LTC3406ES5 Summary of contents

Page 1

... The LTC3406 is available in a low profile (1mm) ThinSOT package. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. ...

Page 2

... RUN 0. 100% FB OUT OUT I = 100mA –100mA 0V 5V RUN SW IN ORDER PART NUMBER TOP VIEW 5 V OUT LTC3406ES5-1.5 LTC3406ES5-1 PART MARKING S5 PACKAGE LTD6 = 250 LTC4 = MIN TYP MAX 30 0.5880 0.6 0.6120 0.5865 0.6 0.6135 0.5850 0.6 0.6150 0.04 0.4 1.455 1.500 1.545 1 ...

Page 3

ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are 3.6V unless otherwise specified. IN SYMBOL PARAMETER V RUN Threshold RUN I RUN Leakage Current RUN Note 1: Absolute Maximum Ratings ...

Page 4

LTC3406 LTC3406-1.5/LTC3406-1 TYPICAL PERFOR A CE CHARACTERISTICS (From Figure1a Except for the Resistive Divider Resistor Values) Oscillator Frequency vs Supply Voltage 1.8 1.7 1.6 1.5 1.4 1.3 1 SUPPLY VOLTAGE (V) 3406 G07 R ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a Except for the Resistive Divider Resistor Values) Start-Up from Shutdown RUN 2V/DIV V OUT 2V/DIV I LOAD 500mA/DIV 3406 G16 V = 3.6V 40 s/DIV 1.8V OUT ...

Page 6

LTC3406 LTC3406-1.5/LTC3406-1 CTIO AL DIAGRA SLOPE OSC FREQ SHIFT OUT 5 + 0.6V LTC3406-1 550k – LTC3406-1 540k V IN RUN 0.6V ...

Page 7

U OPERATIO (Refer to Functional Diagram) Short-Circuit Protection When the output is shorted to ground, the frequency of the oscillator is reduced to about 210kHz, 1/7 the nominal frequency. This frequency foldback ensures that the in- ductor current has more ...

Page 8

LTC3406 LTC3406-1.5/LTC3406-1 APPLICATIO S I FOR ATIO The basic LTC3406 application circuit is shown in Figure 1. External component selection is driven by the load require- ment and begins with the selection of L followed ...

Page 9

U U APPLICATIO S I FOR ATIO The selection driven by the required effective OUT series resistance (ESR). Typically, once the ESR requirement for C met, the RMS current rating generally far exceeds the I requirement. The ...

Page 10

LTC3406 LTC3406-1.5/LTC3406-1 APPLICATIO S I FOR ATIO Although all dissipative elements in the circuit produce losses, two main sources usually account for most of the losses in LTC3406 circuits: V quiescent current and I IN losses. The V ...

Page 11

U U APPLICATIO S I FOR ATIO The junction temperature given by where T is the ambient temperature example, consider the LTC3406 in dropout at ...

Page 12

LTC3406 LTC3406-1.5/LTC3406-1 APPLICATIO S I FOR ATIO 1 5 RUN V FB LTC3406 2 GND – OUT OUT BOLD LINES INDICATE HIGH CURRENT PATHS Figure 5a. LTC3406 ...

Page 13

U U APPLICATIO S I FOR ATIO For the feedback resistors, choose R1 = 316k. R2 can then be calculated from equation (2) to be: V OUT 1000 ...

Page 14

LTC3406 LTC3406-1.5/LTC3406-1.8 U TYPICAL APPLICATIO S Single Li-Ion 1.2V/600mA Regulator for High Efficiency and Small Footprint 1.2V OUT ...

Page 15

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 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 ...

Page 16

... MS8/E Packages Q = 135 A, ThinSOT Package TSSOP-16 Package MS8 Package MS8 Package TSSOP-16 Package Q : 2.65V to 6V MS8 Package 2.5V to 5.5V 2.5V to 5.5V Package 2.5V to 5.5V TSSOP Package IN Q sn3406 3406fs LT/TP 0103 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2002 3406 TA04 ...

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