Datasheet

LTC3809
24
3809fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
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FAX: [phone]
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www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
LT 1108 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
Synchronous DC/DC Converter with Spread Spectrum Modulation
C
IN
22μF
V
IN
3.3V
V
OUT
2.5V
2A
MP
Si3447BDV
MN
Si3460DV
3809 TA04
2
1
4
3
9
8
10
7
5
11
L
1.5μH
15k
300k
187k
59k
L: VISHAY IHLP-2525CZ-01
470pF
2200pF
100pF
1000pF
C
OUT
22μF
SYNCH/MODE V
IN
PLLLPF
6
IPRG
I
TH
V
FB
TG
SW
BG
RUN
GND
LTC3809EDD
PART NUMBER DESCRIPTION COMMENTS
LTC1628/LTC3728 Dual High Effi ciency, 2-Phase Synchronous
Step Down Controllers
Constant Frequency, Standby, 5V and 3.3V LDOs, V
IN
to 36V,
28-Lead SSOP
LTC1735 High Effi ciency Synchronous Step-Down Controller Burst Mode Operation, 16-Pin Narrow SSOP, Fault Protection,
3.5V ≤ V
IN
≤ 36V
LTC1778 No R
SENSE
, Synchronous Step-Down Controller Current Mode Operation Without Sense Resistor,
Fast Transient Response, 4V ≤ V
IN
≤ 36V
LTC3411 1.25A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC Converter 95% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT
≥ 0.8V, I
Q
= 60μA,
I
SD
= <1μA, MS Package
LTC3412 2.5A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC Converter 95% Effi ciency, V
IN
: 2.5V to 5.5V, V
OUT
≥ 0.8V, I
Q
= 60μA,
I
SD
= <1μA, TSSOP-16E Package
LTC3416 4A, 4MHz, Monolithic Synchronous Step-Down Regulator Tracking Input to Provide Easy Supply Sequencing,
2.25V ≤ V
IN
≤ 5.5V, 20-Lead TSSOP Package
LTC3418 8A, 4MHz, Synchronous Step-Down Regulator Tracking Input to Provide Easy Supply Sequencing,
2.25V ≤ V
IN
≤ 5.5V, QFN Package
LTC3708 2-Phase, No R
SENSE
, Dual Synchronous Controller with
Output Tracking
Constant On-Time Dual Controller, V
IN
Up to 36V, Very Low
Duty Cycle Operation, 5mm × 5mm QFN Package
LTC3736/LTC3736-2 2-Phase, No R
SENSE
, Dual Synchronous Controller with
Output Tracking
2.75V ≤ V
IN
≤ 9.8V, 0.6V ≤ V
OUT
≤ V
IN
, 4mm × 4mm QFN
LTC3736-1 Low EMI 2-Phase, Dual Synchronous Controller with
Output Tracking
Integrated Spread Spectrum for 20dB Lower “Noise,”
2.75V ≤ V
IN
≤ 9.8V
LTC3737 2-Phase, No R
SENSE
, Dual DC/DC Controller with Output Tracking
2.75V ≤ V
IN
≤ 9.8V, 0.6V ≤ V
OUT
≤ V
IN
, 4mm × 4mm QFN
LTC3772 Micropower No R
SENSE
Step-Down DC/DC Controller
2.75V ≤ V
IN
≤ 9.8V, 3mm × 2mm DFN or 8-Lead SOT-23,
550kHz, I
Q
= 40μA, Current Mode
LTC3776 Dual, 2-Phase, No R
SENSE
Synchronous Controller for
DDR/QDR Memory Termination
Provides V
DDQ
and V
TT
with One IC, 2.75V ≤ V
IN
≤ 9.8V,
Adjustable Constant Frequency with PLL Up to 850kHz,
Spread Spectrum Operation, 4mm × 4mm QFN and
24-Lead SSOP Packages
LTC3808 Low EMI, Synchronous Controller with Output Tracking
2.75V ≤ V
IN
≤ 9.8V, 4mm × 3mm DFN, Spread Spectrum for
20dB Lower Peak Noise
LTC3809-1 No R
SENSE
Synchronous Controller with Output Tracking
2.75V ≤ V
IN
≤ 9.8V, 3mm × 3mm DFN and 10-Lead MSOPE
Packages
PolyPhase is a trademark of Linear Technology Corporation.