ltc3405es6 Linear Technology Corporation, ltc3405es6 Datasheet

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ltc3405es6

Manufacturer Part Number
ltc3405es6
Description
1.5mhz, 300ma Synchronous Step-down Regulator In Thinsot
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIO S
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
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
AVX TPSB336K006R0600
IN
OUT
CONNECTED TO V
4
1
6
U
V
RUN
MODE
IN
LTC3405
GND
2
SW
V
FB
IN
FOR 2.7V < V
3
5
IN
TM
= 3V
280k
Package
3405 F01a
U
4.7µH**
22pF
887k
IN
< 3.3V
µ
A
+
C
33µF
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 LTC3405 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 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 LTC3405 is available in a low
profile (1mm) ThinSOT package.
For new designs, refer to the LTC3405A data sheet. 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
®
3405 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
3405 F01b
LTC3405
1000
3405fa
1

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ltc3405es6 Summary of contents

Page 1

... ThinSOT package. For new designs, refer to the LTC3405A data sheet. 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

... Note 4: The LTC3405 is tested in a proprietary test mode that connects V to the output of the error amplifier. FB Note 5: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency ORDER PART NUMBER 6 MODE LTC3405ES6 PART MARKING LTXQ = 250° 25°C. A ...

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

LTC3405 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

LTC3405 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) Comparator OVDET guards against transient overshoots > 6.25% by turning the main switch off and keeping it off until the fault is removed. Burst Mode Operation The LTC3405 is capable of Burst Mode operation ...

Page 8

LTC3405 U U APPLICATIO S I FOR ATIO The basic LTC3405 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 where f = operating frequency, C OUT and ∆I = ripple current in the inductor. For a fixed output L voltage, the output ripple is highest at maximum input voltage since ∆I increases ...

Page 10

LTC3405 U U APPLICATIO S I FOR ATIO In pulse skipping mode, the LTC3405 is stable with a 4.7µF ceramic output capacitor with V ≤ 4.2V. For single Li-Ion IN applications operating in pulse skipping mode, the circuit shown in ...

Page 11

U U APPLICATIO S I FOR ATIO top and bottom MOSFET R DS(ON) (DC) as follows )(DC DS(ON)TOP The R for both the top and bottom MOSFETs can DS(ON) be obtained from the Typical ...

Page 12

LTC3405 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 LTC3405. These items are also illustrated graphically in Figures ...

Page 13

U U APPLICATIO S I FOR ATIO Substituting V = 2.5V 4.2V, ∆I OUT 1.5MHz in equation (3) gives ⎛ ⎞ − ⎟ ≅ ...

Page 14

LTC3405 U TYPICAL APPLICATIO 2.7V TO 4.2V 100 OUTPUT CURRENT (mA) Using All Ceramic Capacitors ...

Page 15

... 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. Single Li-Ion to 1.8V/300mA Regulator 4.7µ ...

Page 16

... OUT from 2. 10V 10µ 600mA OUT 10µ 600mA OUT 6V 10µ 600mA OUT IN LT/TP 0604 1K REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2001 = 3.3V = 3.3V 3405fa ...

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