ltc3406es5-1.2 Linear Technology Corporation, ltc3406es5-1.2 Datasheet

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ltc3406es5-1.2

Manufacturer Part Number
ltc3406es5-1.2
Description
1.5mhz, 600ma Synchronous Step-down Regulator In Thinsot
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
High Efficiency: Up to 90%
Very Low Quiescent Current: Only 20µA
600mA Output Current at V
2.5V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Shutdown Mode Draws < 1µA 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 TO 5.5V
V
IN
High Efficiency Step-Down Converter
C
4.7µF
CER
IN
U
V
RUN
LTC3406-1.2
IN
GND
IN
V
TM
OUT
SW
= 3V
Package
U
2.2µH
340612 TA01a
C
10µF
CER
OUT
V
1.2V
600mA
OUT
DESCRIPTIO
The LTC
chronous buck regulator using a constant frequency,
current mode architecture. Supply current during opera-
tion with only 20µA drops <1µA in shutdown. The 2.5V to
5.5V input voltage range makes the LTC3406-1.2 ideally
suited for single Li-Ion battery-powered applications. 100%
duty cycle provides low dropout operation, extending
battery life in portable systems. Automatic Burst Mode
operation further increases efficiency at light loads.
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. The
LTC3406-1.2 is available in a low profile (1mm) ThinSOT
package.
trademarks are the property of their respective owners. ThinSOT is a trademark of Linear
Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066,
6127815, 6498466, 6611131.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
Synchronous Step-Down
®
100
3406-1.2 is a high efficiency monolithic syn-
90
80
70
60
50
40
30
20
10
0
0.1
Regulator in ThinSOT
EFFICIENCY
Efficiency and Power Loss
U
1
LOAD CURRENT (mA)
1.5MHz, 600mA
10
POWER LOSS
100
LTC3406-1.2
V
V
V
IN
IN
IN
340612 TA01b
= 2.7V
= 3.6V
= 4.2V
1000
1
0.1
0.01
0.001
0.0001
0.00001
340612fa
1

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ltc3406es5-1.2 Summary of contents

Page 1

... Schottky diode. The LTC3406-1.2 is available in a low profile (1mm) ThinSOT package. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ThinSOT is a trademark of Linear Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131 ...

Page 2

... PACKAGE/ORDER I FOR ATIO IN + 0.3V 3V)........ 1.3A IN ORDER PART NUMBER LTC3406ES5-1.2 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. ● The denotes specifications which apply over the full operating = 25° ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1) Efficiency vs Input Voltage 100 100mA OUT 10mA OUT 600mA OUT INPUT VOLTAGE (V) ...

Page 4

LTC3406-1 TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1) Supply Current vs Temperature 3. LOAD –50 – TEMPERATURE (°C) ...

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 LOAD 500mA/DIV I L 500mA/DIV 20µs/DIV 100mA TO 600mA ...

Page 6

LTC3406-1.2 U OPERATIO (Refer to Functional Diagram) 2.2µ 2. 5.5V IN 4.7µF LTC3406-1.2 CER 1 5 RUN V OUT GND 2 * MURATA LQH3C2R2M24 ** TAIYO YUDEN JMK212BJ475MG † TAIYO ...

Page 7

U U APPLICATIO S I FOR ATIO The basic LTC3406-1.2 application circuit is shown in Figure 1. External component selection is driven by the load requirement and begins with the selection of L fol- lowed by C and C . ...

Page 8

LTC3406-1 APPLICATIO S I FOR ATIO Typically, once the ESR requirement for C met, the RMS current rating generally far exceeds the requirement. The output ripple ∆V I RIPPLE(P-P) mined by: ⎛ ⎞ 1 ∆ ≅ ∆ + ...

Page 9

U U APPLICATIO S I FOR ATIO 1. The V quiescent current is due to two components: IN the DC bias current as given in the electrical character- istics and the internal main switch and synchronous switch gate charge currents. ...

Page 10

LTC3406-1 APPLICATIO S I FOR ATIO The regulator loop then acts to return V state value. During this recovery time V tored for overshoot or ringing that would indicate a stability problem. For a detailed explanation of switching ...

Page 11

... DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 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. † ...

Page 12

... Dynamically Adjustable, IN OUT = <1µA, DFN Package SD = 2. 0.8V 10µA, IN OUT Q = 2.5V to 5.5V 0.8V 20µA, IN OUT Q = 2.5V to 5.5V 0.6V 20µA, 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 = 2.5V to 5.5V 2.5V 25µA, IN OUT Q LT/LT 0805 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2005 340612fa ...

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