LTC3405AES6-1.8#TRMPBF Linear Technology, LTC3405AES6-1.8#TRMPBF Datasheet

IC REG SYNC STEP-DN 1.8V SOT23-6

LTC3405AES6-1.8#TRMPBF

Manufacturer Part Number
LTC3405AES6-1.8#TRMPBF
Description
IC REG SYNC STEP-DN 1.8V SOT23-6
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC3405AES6-1.8#TRMPBF

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
1.8V
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
Dc To Dc Converter Type
Step Down
Pin Count
6
Input Voltage
5.5V
Output Voltage
1.8V
Switching Freq
1800KHz
Output Current
300mA
Efficiency
93%
Package Type
TSOT-23
Output Type
Fixed
Switching Regulator
Yes
Load Regulation
0.5%
Line Regulation
0.4%/V
Mounting
Surface Mount
Input Voltage (min)
2.5V
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Compliant
Other names
LTC3405AES6-1.8#TRMPBFTR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC3405AES6-1.8#TRMPBFLTC3405AES6-1.8
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC3405AES6-1.8#TRMPBFLTC3405AES6-1.8#TR
Manufacturer:
LT
Quantity:
4 788
Company:
Part Number:
LTC3405AES6-1.8#TRMPBF
Manufacturer:
VISHAY
Quantity:
31 000
Company:
Part Number:
LTC3405AES6-1.8#TRMPBFLTC3405AES6-1.8#TRPBF
Manufacturer:
LT/凌特
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
TO 5.5V
High Efficiency: Up to 93%
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
Shutdown Mode Draws < 1µA Supply Current
±3% 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
4.7µF
CER
*
IN
MURATA LQH3C4R7M34
TAIYO YUDEN JMK212BJ475MG
**
4
1
6
U
V
RUN
MODE
LTC3405A-1.8
IN
GND
2
V
OUT
SW
IN
TM
3
5
3405A1518 F01
= 3V
Package
U
4.7µH*
µ
A
C
4.7µF
CER
OUT
**
V
1.8V
300mA
OUT
DESCRIPTIO
The LTC
monolithic synchronous buck regulators 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-1.5/LTC3405A-1.8 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-1.5/LTC3405A-1.8 are 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. The
LTC3405A-1.5/LTC3405A-1.8 are available in a low profile
(1mm) ThinSOT package.
For adjustable output voltage, refer to the LTC3405A data
sheet.
ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents, including 6580258, 5481178.
1.5V, 1.8V, 1.5MHz, 300mA
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC3405A-1.5/LTC3405A-1.8
Synchronous Step-Down
®
3405A-1.5/LTC3405A-1.8 are high efficiency
100
Regulators in ThinSOT
90
80
70
60
50
40
Figure 1b. Efficiency vs Load Current
0.1
V
IN
U
= 5.5V
OUTPUT CURRENT (mA)
1
V
V
IN
IN
V
= 4.2V
= 3.6V
IN
= 2.7V
10
100
3405A1518 F01b
1000
3405a1518fa
1

Related parts for LTC3405AES6-1.8#TRMPBF

LTC3405AES6-1.8#TRMPBF Summary of contents

Page 1

... Schottky diode. The LTC3405A-1.5/LTC3405A-1.8 are available in a low profile (1mm) ThinSOT package. For adjustable output voltage, refer to the LTC3405A 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. 100 90 ...

Page 2

... P according to the following formula: D LTC3405A Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency ORDER PART NUMBER 6 MODE LTC3405AES6-1 OUT LTC3405AES6-1 PART MARKING LTZQ = 250° LTZP = 25°C. A MIN TYP MAX 375 500 625 ● ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure1a) Efficiency vs Input Voltage 100mA OUT 10mA OUT I = 250mA OUT I = 1mA OUT 0.1mA OUT ...

Page 4

LTC3405A-1.5/LTC3405A-1 TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a) Dynamic Supply Current vs Supply Voltage 1800 V = 1.8V OUT 1600 LOAD 1400 1200 1000 800 600 400 PULSE SKIPPING MODE 200 BURST MODE OPERATION ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a) 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 20mA TO 250mA LOAD = 3405A1518 G20 ...

Page 6

LTC3405A-1.5/LTC3405A-1 CTIO AL DIAGRA MODE 6 SLOPE COMP OSC FREQ SHIFT V OUT 5 R1 LTC3405A-1 110k 440k – LTC3405A-1 180k R2 = 360k V ...

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-1.5/LTC3405A-1 APPLICATIO S I FOR ATIO The basic LTC3405A series parts application circuit is shown in Figure 1. External component selection is driven by the load requirement and begins with the selection of L followed by C and ...

Page 9

U U APPLICATIO S I FOR ATIO Aluminum electrolytic and dry tantalum capacitors are both available in surface mount configurations. In the case of tantalum critical that the capacitors are surge tested for use in switching power supplies. ...

Page 10

LTC3405A-1.5/LTC3405A-1 APPLICATIO S I FOR ATIO losses are calculated from the resistances of the internal switches and external inductor R SW continuous mode, the average output current flowing through inductor L is ...

Page 11

U U APPLICATIO S I FOR ATIO PC Board Layout Checklist When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the LTC3405A series parts. These items are also illustrated graphically in ...

Page 12

LTC3405A-1.5/LTC3405A-1 APPLICATIO S I FOR ATIO 2.7V TO 4.2V AC COUPLED 6.8µ LTC3405A-1.8 4.7µF 1 CER RUN 6 5 MODE V OUT GND *SUMIDA CMD4D11-6R8MC ...

Page 13

U TYPICAL APPLICATIO 2.7V TO 4.2V AC COUPLED LTC3405A-1.5/LTC3405A-1.8 Single Li-Ion to 1.5V/300mA Regulator for High Efficiency and Small Footprint 4.7µ LTC3405A-1.5 4.7µF 1 CER RUN 6 5 MODE ...

Page 14

LTC3405A-1.5/LTC3405A-1.8 U TYPICAL APPLICATIO S Using All Ceramic Capacitors Optimized for Smallest Footprint V IN 2.7V TO 4.2V AC COUPLED 14 Single Li-Ion to 1.5V/150mA Regulator 2.2µ LTC3405A-1.5 2.2µF 1 CER RUN ...

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. LTC3405A-1.5/LTC3405A-1.8 ...

Page 16

... IN OUT Q = 2.5V to 5.5V 0.8V 60µA IN OUT Q = 2.5V to 5.5V 0.8V 60µA IN OUT Q = 2.25V to 5.5V 280µA IN OUT REF 5.5V to 60V 1.20V 2.5mA IN OUT Q = 2.5V to 5.5V 2.5V 25µA IN OUT Q 3405a1518fa LT/TP 0604 1K REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2002 ...

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