28
LTC3808
3808f
© LINEAR TECHNOLOGY CORPORATION 2005
LT/TP 0305 500 • PRINTED IN THE USA
PART NUMBER DESCRIPTION COMMENTS
LTC1628/LTC3728 Dual High Efficiency, 2-Phase Synchronous Constant Frequency, Standby, 5V and 3.3V LDOs, V
IN
to 36V,
Step Down Controllers 28-Lead SSOP
LTC1735 High Efficiency Synchronous Step-Down Controller Burst Mode Operation, 16-Pin Narrow SSOP, Fault Protection,
3.5V ≤ V
IN
≤ 36V
LTC1772 Constant Frequency Current Mode Step-Down 2.5V ≤ V
IN
≤ 9.8V, I
OUT
Up to 4A, SOT-23 Package, 550kHz
DC/DC Controller
LTC1773 Synchronous Step-Down Controller 2.65V ≤ V
IN
≤ 8.5V, I
OUT
Up to 4A, 10-Lead MSOP
LTC1778 No R
SENSE
, Synchronous Step-Down Controller Current Mode Operation Without Sense Resistor,
Fast Transient Response, 4V ≤ V
IN
≤ 36V
LTC1872 Constant Frequency Current Mode Step-Up Controller 2.5V ≤ V
IN
≤ 9.8V, SOT-23 Package, 550kHz
LTC3411 1.25A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC Converter 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT
= 0.8V, I
Q
= 60mA,
I
SD
= <1mA, MS Package
LTC3412 2.5A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC Converter 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT
= 0.8V, I
Q
= 60mA,
I
SD
= <1mA, 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
LTC3701 2-Phase, Low Input Voltage Dual Step-Down DC/DC Controller 2.5V ≤ V
IN
≤ 9.8V, 550kHz, PGOOD, PLL, 16-Lead SSOP
LTC3708 2-Phase, No R
SENSE
, Dual Synchronous Controller with Constant On-Time Dual Controller, V
IN
Up to 36V, Very Low
Output Tracking Duty Cycle Operation, 5mm × 5mm QFN Package
LTC3736 2-Phase, No R
SENSE
, Dual Synchronous Controller with 2.75V ≤ V
IN
≤ 9.8V, 0.6V ≤ V
OUT
≤ V
IN
, 4mm × 4mm QFN
Output Tracking
LTC3736-1 Low EMI 2-Phase, Dual Synchronous Controller with Integrated Spread Spectrum for 20dB Lower EMI,
Output Tracking 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
PolyPhase is a trademark of Linear Technology Corporation.
RELATED PARTS
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
TYPICAL APPLICATIO S
U
550kHz, Pulse-Skipping Mode, Synchronous DC/DC Converter with Ceramic Output Capacitor
C
VIN
1µF
R
VIN
10Ω
C
IN
22µF
V
IN
3.3V
V
OUT
2.5V
2A
MP
Si3447BDV
MN
Si3460DV
3808 TA04
1
8
4
3
6
2
5
12
11
13
10
14
9
7
15
L
1.5µH
R
ITH
22k
187k
59k
L: VISHAY IHLP-2525CZ-01
C
ITH
470pF
C
OUT
22µF
2x
PLLLPF V
IN
SENSE
+
IPRG
PGOOD
TRACK/SS
I
TH
SYNC/MODE
V
FB
SENSE
–
TG
SW
BG
RUN
GND
LTC3808EDE
