LTC3808 Datasheet, PDF (28/28 Pages) Linear Technology – No RSENSE TM, Low EMI, Synchronous DC/DC Controller with Output Tracking

LTC3808
TYPICAL APPLICATIO S
550kHz, Pulse-Skipping Mode, Synchronous DC/DC Converter with Ceramic Output Capacitor
C_ITH
470pF
R_ITH
22k
187k
R_VIN
10Ω
1
PLLLPF
12
V_IN
LTC3808EDE
8
IPRG
SENSE^{+ 11}
4
PGOOD
10
TG
3
TRACK/SS
SENSE^{– 13}
6
I_TH
14
SW
2
SYNC/MODE
9
BG
5
V_FB
7
GND
RUN
59k
15
V_IN
C_IN
3.3V
C_VIN
22µF
1µF
MP
Si3447BDV
L
MN
1.5µH
Si3460DV
C_OUT
22µF
2x
V_OUT
2.5V
2A
L: VISHAY IHLP-2525CZ-01
3808 TA04
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
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High Efficiency Synchronous Step-Down Controller
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Burst Mode Operation, 16-Pin Narrow SSOP, Fault Protection,
3.5V ≤ V_IN ≤ 36V
2.5V ≤ V_IN ≤ 9.8V, I_OUT Up to 4A, SOT-23 Package, 550kHz
LTC1773
LTC1778
LTC1872
LTC3411
LTC3412
LTC3416
LTC3701
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Synchronous Step-Down Controller
No R_SENSE, Synchronous Step-Down Controller
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2-Phase, Low Input Voltage Dual Step-Down DC/DC Controller
2-Phase, No R_SENSE, Dual Synchronous Controller with
Output Tracking
2.65V ≤ V_IN ≤ 8.5V, I_OUT Up to 4A, 10-Lead MSOP
Current Mode Operation Without Sense Resistor,
Fast Transient Response, 4V ≤ V_IN ≤ 36V
2.5V ≤ V_IN ≤ 9.8V, SOT-23 Package, 550kHz
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT = 0.8V, I_Q = 60mA,
I_SD = <1mA, MS Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT = 0.8V, I_Q = 60mA,
I_SD = <1mA, TSSOP-16E Package
Tracking Input to Provide Easy Supply Sequencing,
2.25V ≤ V_IN ≤ 5.5V, 20-Lead TSSOP Package
2.5V ≤ V_IN ≤ 9.8V, 550kHz, PGOOD, PLL, 16-Lead SSOP
Constant On-Time Dual Controller, V_IN Up to 36V, Very Low
Duty Cycle Operation, 5mm × 5mm QFN Package
LTC3736
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
LTC3737
Low EMI 2-Phase, Dual Synchronous Controller with
Integrated Spread Spectrum for 20dB Lower EMI,
Output Tracking
2.75V ≤ V_IN ≤ 9.8V
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.
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3808f
LT/TP 0305 500 • PRINTED IN THE USA
© LINEAR TECHNOLOGY CORPORATION 2005