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LTC3411EMS Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3411EMS
Description  1.25A, 4MHz, Synchronous Step-Down DC/DC Converter
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3411EMS Datasheet(HTML) 1 Page - Linear Technology

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LTC3411
1
sn3411 3411fs
The LTC
®3411 is a constant frequency, synchronous,
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 sychronous 0.11
power switches with 1.6A peak current ratings provide
high efficiency. The LTC3411’s current mode architecture
and external compensation allow the transient response
to be optimized over a wide range of loads and output
capacitors.
The LTC3411 can be configured for automatic power
saving Burst Mode operation to reduce gate charge losses
when the load current drops below the level required for
continuous operation. For reduced noise and RF interfer-
ence, the SYNC/MODE pin can be configured to skip
pulses or provide forced continuous operation.
To further maximize battery life, the P-channel MOSFET is
turned on continuously in dropout (100% duty cycle) with
a low quiescent current of 60
µA. In shutdown, the device
draws <1
µA.
s
Notebook Computers
s
Digital Cameras
s
Cellular Phones
s
Handheld Instruments
s
Board Mounted Power Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Small 10-Lead MSOP or DFN Package
s
Uses Tiny Capacitors and Inductor
s
High Frequency Operation: Up to 4MHz
s
High Switch Current: 1.6A
s
Low RDS(ON) Internal Switches: 0.110Ω
s
High Efficiency: Up to 95%
s
Stable with Ceramic Capacitors
s
Current Mode Operation for Excellent Line
and Load Transient Response
s
Short-Circuit Protected
s
Low Dropout Operation: 100% Duty Cycle
s
Low Shutdown Current: IQ ≤ 1µA
s
Low Quiescent Current: 60
µA
s
Output Voltages from 0.8V to 5V
s
Selectable Burst Mode
® Operation
s
Sychronizable to External Clock
1.25A, 4MHz, Synchronous
Step-Down DC/DC Converter
Efficiency vs Load Current
Figure 1. Step-Down 2.5V/1.25A Regulator
Burst Mode is a registered trademark of Linear Technology Corporation.
DESCRIPTIO
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
SYNC/MODE
VIN
LTC3411
PVIN
SW
SVIN
PGOOD
ITH
SHDN/RT
PGND
SGND
VFB
L1
2.2
µH
VOUT
2.5V/1.25A
VIN
2.63V TO 5.5V
887k
412k
1000pF
3411 F01
C2
22
µF
13k
C1
22
µF
324k
NOTE: IN DROPOUT, THE OUTPUT TRACKS
THE INPUT VOLTAGE
C1, C2: TAIYO YUDEN JMK325BJ226MM
L1: TOKO A914BYW-2R2M (D52LC SERIES)
LOAD CURRENT (mA)
100
95
90
85
80
75
70
1
100
1000
3411 TA01
10
VIN = 3.3V
VOUT = 2.5V
fO = 1MHz
Burst Mode OPERATION


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