LTC3772B Datasheet, PDF (20/20 Pages) Linear Technology – Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

LTC3772B
TYPICAL APPLICATIO
220pF
15k
82.5k
I_TH/RUN V_IN
LTC3772B
GND PGATE
I_PRG
V_FB
SW
22pF 174k
FDC638P
L1 3.3µH
B220A
L1: TOKO D53LC #A915AY-3R3M
C_IN: TAIYO YUDEN LMK316BJ226ML
C_OUT: TAIYO YUDEN JMK325BJ476MM
V_IN
3V TO 8V
C_IN
22µF
C_OUT
47µF
V_OUT
2.5V
2A
3772B F05
Figure 5. 550kHz Micropower Step-Down DC/DC Converter
RELATED PARTS
PART NUMBER
LTC1624
LTC1625
LTC1772/LTC1772B
LTC1778/LTC1778-1
LTC1872/LTC1872B
LTC3411/LTC3412
DESCRIPTION
High Efficiency SO-8 N-Channel Switching Regulator Controller
No R_SENSE^TM Synchronous Step-Down Regulator
550kHz ThinSOT Step-Down DC/DC Controllers
No R_SENSE Current Mode Synchronous Step-Down Controllers
550kHz ThinSOT Step-Up DC/DC Controllers
1.25A/2.5A, 4MHz Monolithic Synchronous Step-Down Converter
LTC3414
4A, 4MHz Monolithic Synchronous Step-Down Converter
LTC3418
8A, 4MHz Monolithic Synchronous Step-Down Converter
LTC3440
LTC3736/LTC3736-2
LTC3736-1
LTC3737
600mA (I_OUT), 2MHz Synchronous Buck-Boost DC/DC Converter
Dual, 2-Phase, No R_SENSE Synchronous Controller
with Output Tracking
Dual, 2-Phase, No R_SENSE Synchronous Controller
with Spread Spectrum
Dual, 2-Phase, No R_SENSE Controller with Output Tracking
LTC3772
Micropower No R_SENSE Constant Frequency Controller
LTC3776
Dual, 2-Phase, No R_SENSE Synchronous Controller for
DDR/QDR Memory Termination
LTC3808
LTC3809/LTC3809-1
No R_SENSE, Low EMI, Synchronous Step-Down Controller with
Output Tracking
No R_SENSE, Synchronous Step-Down Controller
COMMENTS
N-Channel Drive, 3.5V ≤ V_IN ≤ 36V
97% Efficiency, No Sense Resistor
2.5V ≤ V_IN ≤ 9.8V, V_OUT ≥ 0.8V, I_OUT ≤ 6A
4V ≤ V_IN ≤ 36V, 0.8V ≤ V_OUT ≤ (0.9)(V_IN), I_OUT Up to 20A
2.5V ≤ V_IN ≤ 9.8V; 90% Efficiency
95% Efficiency, 2.5V ≤ V_IN ≤ 5.5V, V_OUT ≥ 0.8V,
TSSOP16 Exposed Pad Package
95% Efficiency, 2.5V ≤ V_IN ≤ 5.5V, V_OUT ≥ 0.8V,
TSSOP20 Exposed Pad Package
95% Efficiency, 2.5V ≤ V_IN ≤ 5.5V, V_OUT ≥ 0.8V,
TSSOP20 Exposed Pad Package
2.5V ≤ V_IN ≤ 5.5V, Single Inductor
V_IN: 2.75V to 9.8V, I_OUT Up to 5A,
4mm × 4mm QFN Package
V_IN: 2.75V to 9.8V, Spread Spectrum Operation, Output
Voltage Tracking, 4mm × 4mm QFN Package
V_IN: 2.75V to 9.8V, I_OUT Up to 5A,
4mm × 4mm QFN Package
V_IN: 2.75V to 9.8V, I_OUT Up to 5A, ThinSOT,
3mm × 2mm DFN Package
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
16-Lead SSOP Packages
2.75V ≤ V_IN ≤ 9.8V, Spread Spectrum Operation,
3mm × 4mm DFN and 16-Lead SSOP Packages
2.75V ≤ V_IN ≤ 9.8V, 3mm × 4mm DFN and 10-Lead MSOP
Packages
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3772bfa
LT 0606 REV A • PRINTED IN THE USA
© LINEAR TECHNOLOGY CORPORATION 2005