LTC3405AES6#TR Linear Technology, LTC3405AES6#TR Datasheet

IC REG SYNC S-DWN 1.5MHZ SOT23-6

LTC3405AES6#TR

Manufacturer Part Number
LTC3405AES6#TR
Description
IC REG SYNC S-DWN 1.5MHZ SOT23-6
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC3405AES6#TR

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.8 ~ 6 V
Current - Output
300mA
Frequency - Switching
1.5MHz
Voltage - Input
2.5 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
TSOT-23-6, TSOT-6
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
Other names
LTC3405AES6TR

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APPLICATIO S
FEATURES
TYPICAL APPLICATIO
TO 5.5V
High Efficiency: Up to 96%
Very Low Quiescent Current: Only 20
During Operation
300mA Output Current at V
2.5V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Stable with Ceramic Capacitors
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1µA Supply Current
±2% Output Voltage Accuracy
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
2.2µF
CER
V
MURATA LQH3C4R7M34
TAIYO YUDEN LMK212BJ225MG
TAIYO YUDEN JMK212BJ475MG
IN
OUT
CONNECTED TO V
4
1
6
U
V
RUN
MODE
IN
LTC3405A
GND
2
SW
V
FB
IN
FOR 2.7V < V
3
5
IN
TM
= 3V
280k
Package
3405A F01a
U
4.7µH**
22pF
887k
IN
< 3.3V
µ
A
C
4.7µF
CER
OUT
††
V
3.3V
OUT
*
DESCRIPTIO
The LTC
nous buck regulator using a constant frequency, current
mode architecture. Supply current during operation is
only 20µA and drops to <1µA in shutdown. The 2.5V to
5.5V input voltage range makes the LTC3405A ideally
suited for single Li-Ion battery-powered applications. 100%
duty cycle provides low dropout operation, extending
battery life in portable systems.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The LTC3405A is specifically designed to work well with
ceramic output capacitors, achieving very low output
voltage ripple and a small PCB footprint.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.8V feed-
back reference voltage. The LTC3405A is available in a low
profile (1mm) ThinSOT package.
For fixed 1.5V and 1.8V output versions, refer to the
LTC3405A-1.5/LTC3405A-1.8 data sheet.
ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents, including 6580258, 5481178.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Synchronous Step-Down
®
3405A is a high efficiency monolithic synchro-
100
95
90
85
80
75
70
65
60
Figure 1b. Efficiency vs Load Current
0.1
Regulator in ThinSOT
V
IN
= 5.5V
U
OUTPUT CURRENT (mA)
1
V
V
IN
IN
1.5MHz, 300mA
= 3.6V
= 4.2V
10
100
3405A F01b
LTC3405A
1000
3405afa
1

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LTC3405AES6#TR Summary of contents

Page 1

... The LTC3405A is available in a low profile (1mm) ThinSOT package. For fixed 1.5V and 1.8V output versions, refer to the LTC3405A-1.5/LTC3405A-1.8 data sheet. , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. Protected by U.S. Patents, including 6580258, 5481178. V ...

Page 2

... MODE I MODE Leakage Current MODE Burst Mode is a registered trademark of Linear Technology Corporation. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC3405AE is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure1a Except for the Resistive Divider Resistor Values) Efficiency vs Input Voltage 100mA OUT 10mA OUT I = 250mA OUT I = 1mA OUT 80 ...

Page 4

LTC3405A W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a Except for the Resistive Divider Resistor Values Temperature DS(ON) 1 4. 0.8 0.6 0.4 0.2 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a Except for the Resistive Divider Resistor Values) Load Step V OUT 100mV/DIV AC COUPLED I L 200mA/DIV I LOAD 200mA/DIV V = 3.6V 40µs/DIV 1.8V OUT I ...

Page 6

LTC3405A CTIO AL DIAGRA MODE 6 SLOPE COMP OSC FREQ SHIFT 0.8V EA – RUN 0.8V REF 1 – OVDET + 0.85V SHUTDOWN U OPERATIO (Refer to Functional Diagram) Main Control ...

Page 7

U OPERATIO (Refer to Functional Diagram) When the converter is in Burst Mode operation, the peak current of the inductor is set to approximately 100mA re- gardless of the output load. Each burst event can last from a few cycles ...

Page 8

LTC3405A U U APPLICATIO S I FOR ATIO The basic LTC3405A application circuit is shown in Fig- ure 1. External component selection is driven by the load requirement and begins with the selection of L followed by C and C ...

Page 9

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

Page 10

LTC3405A U U 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 LTC3405A circuits: V quiescent current and I IN losses. The V quiescent ...

Page 11

U U APPLICATIO S I FOR ATIO The junction temperature given by where T is the ambient temperature example, consider the LTC3405A in dropout at ...

Page 12

LTC3405A U U APPLICATIO S I FOR ATIO 1. The power traces, consisting of the GND trace, the SW trace and the V trace should be kept short, direct and IN wide. 2. Does the V pin connect directly to ...

Page 13

U U APPLICATIO S I FOR ATIO V IN 2. 6.8µ † 22pF C IN LTC3405A 2.2µF 1 CER RUN 6 5 MODE V FB 887k GND *SUMIDA CMD4D11-6R8MC 412k 2 ...

Page 14

LTC3405A U TYPICAL APPLICATIO 2.7V TO 4.2V 100 100 OUTPUT CURRENT (mA) Using All Ceramic ...

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

... IN to 500mA, 1MHz Operation, OUT Pin, Constant Frequency 600mA, REF OUT from 2. 10V 10µ 600mA OUT 10µ 600mA OUT 10µ 600mA OUT LT/TP 0604 1K REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2002 = 3. 3.3V IN 3405afa ...

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