LTC3561EDD#TRPBF Linear Technology, LTC3561EDD#TRPBF Datasheet

IC DC/DC CONV 1A 8-DFN

LTC3561EDD#TRPBF

Manufacturer Part Number
LTC3561EDD#TRPBF
Description
IC DC/DC CONV 1A 8-DFN
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC3561EDD#TRPBF

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.8 ~ 5 V
Current - Output
1A
Frequency - Switching
Up to 4MHz
Voltage - Input
2.63 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-DFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-

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Company
Part Number
Manufacturer
Quantity
Price
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Part Number:
LTC3561EDD#TRPBFLTC3561EDD
Manufacturer:
LT
Quantity:
10 000
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Part Number:
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Manufacturer:
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Quantity:
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Part Number:
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Manufacturer:
LINEAR/凌特
Quantity:
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Company:
Part Number:
LTC3561EDD#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC3561EDD#TRPBF
Quantity:
3 900
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
1000pF
Uses Tiny Capacitors and Inductor
High Frequency Operation: Up to 4MHz
High Switch Current: 1.4A
Low R
High Efficiency: Up to 95%
V
Stable with Ceramic Capacitors
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Low Shutdown Current: I
Low Quiescent Current: 240µA
Output Voltages from 0.8V to 5V
Low Noise Pulse-Skipping Operation
Small 8-Pin DFN Package
Wireless LAN Power
Notebook Computers
Digital Cameras
Cellular Phones
Board Mounted Power Supplies
IN
13k
: 2.63V to 5.5V
NOTE: IN DROPOUT, THE OUTPUT TRACKS
DS(ON)
THE INPUT VOLTAGE.
324k
Step-Down 2.5V/1A Regulator
Internal Switches: 0.110Ω
I
SHDN/R
TH
U
SGND
T
LTC3561
PGND
Q
≤ 1µA
PV
SV
SW
V
2.63V TO 5.5V
FB
IN
IN
U
V
IN
412k
2.2µH
3561 F01
887k
22µF
22µF
V
2.5V/1A
OUT
Step-Down DC/DC Converter
DESCRIPTIO
The LTC
step-down DC/DC converter. Intended for medium power
applications, it operates from a 2.63V to 5.5V input voltage
range and has a user configurable operating frequency up
to 4MHz, allowing the use of tiny, low cost capacitors and
inductors 2mm or less in height. The output voltage is
adjustable from 0.8V to 5V. Internal synchronous 0.11Ω
power switches with 1.4A peak current ratings provide
high efficiency. The LTC3561’s current mode architecture
and external compensation allow the transient response
to be optimized over a wide range of loads and output
capacitors.
To further maximize battery life, the P-channel MOSFET is
turned on continuously in dropout (100% duty cycle). The
no-load quiescent current is only 240µA. In shutdown, the
device draws <1µA.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 6127815, 6304066, 6498466, 6580258, 6611131.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
1A, 4MHz, Synchronous
®
Efficiency and Power Loss vs Load Current
3561 is a constant-frequency, synchronous,
100
75
70
65
60
55
95
90
85
80
50
10
EFFICIENCY
U
LOAD CURRENT (mA)
100
POWER LOSS
V
V
f
O
IN
OUT
= 1MHz
= 3.3V
= 2.5V
3561 TA01
LTC3561
1000
10
1000
100
1
1
3561f

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LTC3561EDD#TRPBF Summary of contents

Page 1

... The no-load quiescent current is only 240µA. In shutdown, the device draws <1µA. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 6127815, 6304066, 6498466, 6580258, 6611131. ...

Page 2

LTC3561 ABSOLUTE AXI U RATI GS (Note Voltages .....................................– 0. SHDN/R Voltages ................ – 0. Voltage ................................................– 0. ...

Page 3

ELECTRICAL CHARACTERISTICS Note calculated from the ambient T and power dissipation according to the following formula: LTC3561EDD • 43°C/ Note 6: Switch on-resistance is guaranteed by ...

Page 4

LTC3561 W U TYPICAL PERFOR A CE CHARACTERISTICS Frequency Variation vs Temperature –2 –4 –6 –8 –10 –50 – 100 TEMPERATURE (°C) 3561 G10 CTIO ...

Page 5

W BLOCK DIAGRA 0.8V REFERENCE OPERATIO The LTC3561 uses a constant frequency, current mode architecture. The operating frequency is determined by the value of the R resistor. T The output voltage is set ...

Page 6

LTC3561 U U APPLICATIO S I FOR ATIO A general LTC3561 application circuit is shown in Figure 4. External component selection is driven by the load requirement, and begins with the selection of the inductor L1. Once L1 is chosen, ...

Page 7

U U APPLICATIO S I FOR ATIO Table 1. Representative Surface Mount Inductors MANU- FACTURER PART NUMBER VALUE CURRENT DCR HEIGHT Toko A914BYW-2R2M-D52LC 2.2µH Coilcraft D01608C-222 2.2µH Coilcraft LP01704-222M 2.2µH Sumida CDRH2D18/HP-2R2 2.2µH Taiyo Yuden N05DB2R2M 2.2µH Murata LQN6C2R2M04 2.2µH ...

Page 8

LTC3561 U U APPLICATIO S I FOR ATIO piezoelectric effects. In addition, the high Q of ceramic capacitors along with trace inductance can lead to signifi- cant ringing. Other capacitor types include the Panasonic specialty polymer (SP) capacitors. In most ...

Page 9

U U APPLICATIO S I FOR ATIO reduces surge currents from V by gradually increasing IN the peak inductor current. Power supply sequencing can also be accomplished using this pin. The LTC3561 has an internal digital soft-start which steps up ...

Page 10

LTC3561 U U APPLICATIO S I FOR ATIO The output voltage settling behavior is related to the stability of the closed-loop system and will demonstrate the actual overall supply performance. For a detailed explanation of optimizing the compensation components, including ...

Page 11

U U APPLICATIO S I FOR ATIO looking into the SW pin is a function of both top and bottom MOSFET R and the duty cycle (DC) as DS(ON) follows TOP)(DC DS(ON) The R ...

Page 12

LTC3561 U U APPLICATIO S I FOR ATIO For cost reasons, a ceramic capacitor will be used. C selection is then based on load step droop instead of ESR requirements. For a 5% output droop ≈ ...

Page 13

U TYPICAL APPLICATIO 2.63V TO C1 5.5V 10µ LTC3561 SHDN SGND PGND R3 13k C3 1000pF NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE C1, C2: ...

Page 14

LTC3561 U TYPICAL APPLICATIO 4.7µH LTC3402 SHDN V OUT + 2 CELLS MODE/SYNC FB PGOOD 10µF R GND T 49.9k C1: TAIYO YUDEN JMK212BJ106MG 0 = ...

Page 15

... RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 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 16

... LTC3413 3A (I Sink/Source) 2MHz Monolithic Synchronous Regulator OUT for DDR/QDR Memory Termination LTC3440 600mA (I ) 2MHz Synchronous Buck-Boost DC/DC Converter OUT ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● V OUT 1 ...

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