ltc3406bes5-1.8 Linear Technology Corporation, ltc3406bes5-1.8 Datasheet

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ltc3406bes5-1.8

Manufacturer Part Number
ltc3406bes5-1.8
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 96%
600mA 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
Low Quiescent Current: 300µA
0.6V Reference Allows Low Output Voltages
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
TO 5.5V
2.7V
Figure 1a. High Efficiency Step-Down Converter
V
IN
C
4.7µF
CER
IN
**
**
*
U
MURATA LQH32CN2R2M33
TAIYO YUDEN JMK212BJ475MG
TAIYO YUDEN JMK316BJ106ML
4
1
V
RUN
LTC3406B-1.8
IN
GND
2
V
IN
OUT
SW
TM
= 3V
Package
U
3
5
2.2µH*
3406B F01a
C
10µF
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 with no load is 300µA and drops to <1µA in
shutdown. The 2.5V to 5.5V input voltage range makes the
LTC3406B ideally suited for single Li-Ion battery-powered
applications. 100% duty cycle provides low dropout op-
eration, extending battery life in portable systems. PWM
pulse skipping mode operation provides very low output
ripple voltage for noise sensitive applications.
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 LTC3406B is available in a low
profile (1mm) ThinSOT package. Refer to LTC3406 for
applications that require Burst Mode
Burst Mode is a registered trademark of Linear Technology Corporation.
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
®
3406B is a high efficiency monolithic synchro-
100
90
80
70
60
50
40
30
20
10
0.1
Figure 1b. Efficiency vs Load Current
Regulator in ThinSOT
V OUT = 1.8V
V IN = 3.6V
V IN = 4.2V
U
OUTPUT CURRENT (mA)
1
1.5MHz, 600mA
V IN = 2.7V
10
100
®
3406B F01b
operation.
LTC3406B
1000
3406bfa
1

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ltc3406bes5-1.8 Summary of contents

Page 1

... The LTC3406B is available in a low profile (1mm) ThinSOT package. Refer to LTC3406 for applications that require Burst Mode , 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

... FB OUT I = 100mA –100mA 0V 5V RUN SW IN ORDER PART NUMBER TOP VIEW 5 V OUT LTC3406BES5-1.5 LTC3406BES5-1 PART MARKING S5 PACKAGE LTE3 = 250°C/ W, θ = 90° LTE4 MIN TYP MAX ● ±30 0.5880 0.6 0.6120 0.5865 0.6 0.6135 ● ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are T SYMBOL PARAMETER V RUN Threshold RUN I RUN Leakage Current RUN Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The ...

Page 4

LTC3406B W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure1a Except for the Resistive Divider Resistor Values) Oscillator Frequency vs Supply Voltage 1 25°C A 1.7 1.6 1.5 1.4 1.3 1 SUPPLY VOLTAGE (V) ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a Except for the Resistive Divider Resistor Values) Start-Up from Shutdown RUN 5V/DIV V OUT 1V/DIV I L 500mA/DIV 3406B G16 V = 3.6V 40µs/DIV 1.8V OUT I ...

Page 6

LTC3406B CTIO AL DIAGRA SLOPE COMP OSC FREQ SHIFT OUT 5 + 0.6V LTC3406B-1 550k – LTC3406B-1 540k V IN – OVDET ...

Page 7

U OPERATIO (Refer to Functional Diagram) Dropout Operation As the input supply voltage decreases to a value approach- ing the output voltage, the duty cycle increases toward the maximum on-time. Further reduction of the supply voltage forces the main switch ...

Page 8

LTC3406B U U APPLICATIO S I FOR ATIO The basic LTC3406B 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 C . ...

Page 9

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

Page 10

LTC3406B 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 LTC3406B 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 LTC3406B in dropout at ...

Page 12

LTC3406B U U APPLICATIO S I FOR ATIO 1 5 RUN V FB LTC3406B 2 GND – OUT OUT BOLD LINES INDICATE HIGH CURRENT PATHS Figure 5a. LTC3406B Layout ...

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

LTC3406B U TYPICAL APPLICATIO S Single Li-Ion 1.2V/600mA Regulator for High Efficiency and Small Footprint 2.2µ 2. † 22pF TO 4. 4.7µF LTC3406B CER 1 5 RUN V FB 301k GND ...

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

... 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/TP 0604 1K REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2002 3406bfa ...

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