LTC3801 Datasheet, PDF (12/12 Pages) Linear Technology – Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT

LTC3801/LTC3801B
TYPICAL APPLICATIO
550kHz Micropower Step-Down DC/DC Controller
220pF
10k
402k
I_TH/RUN V_IN
LTC3801/
LTC3801B
GND SENSE^–
V_FB
PGATE
866k
0.025Ω
V_IN
2.7V TO 9.8V
10µF
4.7µH
+
47µF
V_OUT
2.5V
2A
3801 TA01
LTC3801 No-Load I_Q vs Input Voltage*
25
V_OUT = 2.5V
FRONT PAGE APPLICATION
23
21
19
17
15
3
4 5 6 7 8 9 10
V_IN INPUT VOLTAGE (V)
3801 TA04
*SEE THE FRONT PAGE OF THIS DATA SHEET FOR THE EFFICIENCY vs LOAD CURRENT CURVE
RELATED PARTS
PART NUMBER
LTC1147 Series
LTC1622
DESCRIPTION
High Efficiency Step-Down Switching Regulator Controllers
Low Input Voltage Current Mode Step-Down DC/DC Controller
LTC1624
LTC1625
LTC1702A
LTC1733
High Efficiency SO-8 N-Channel Switching Regulator Controller
No R_SENSE^TM Synchronous Step-Down Regulator
550kHz, 2 Phase, Dual Synchronous Controller
Li-Ion Linear Battery Charger
LT^®1765
LTC1771
25V, 2.75A (I_OUT), 1.25MHz Step-Down Converter
Ultra-Low Supply Current Step-Down DC/DC Controller
LTC1772/LTC1772B
LTC1778/LTC1778-1
LTC1779
LTC1872/LTC1872B
LTC3411/LTC3412
550kHz ThinSOT Step-Down DC/DC Controllers
No R_SENSE Current Mode Synchronous Step-Down Controllers
250mA Monolithic Step-Down Converter in ThinSOT
550kHz ThinSOT Step-Up DC/DC Controllers
1.25/2.5A Monolithic Synchronous Step-Down Converter
LTC3440
600mA (I_OUT), 2MHz Synchronous Buck-Boost DC/DC Converter
No R_SENSE is a trademark of Linear Technology Corporation.
COMMENTS
100% Duty Cycle, 3.5V ≤ V_IN ≤ 16V
V_IN 2V to 10V, I_OUT Up to 4.5A, Synchronizable to
750kHz Optional Burst Mode Operation, 8-Lead MSOP
N-Channel Drive, 3.5V ≤ V_IN ≤ 36V
97% Efficiency, No Sense Resistor
Two Channels; Minimum C_IN and C_OUT, I_OUT up to 15A
Standalone Charger with Charge Termination, Integrated
MOSFET, Thermal Regulator Prevents Overheating
3V ≤ V_IN ≤ 25V, V_OUT ≥ 1.2V, SO-8 and TSSOP16 Packages
10µA Supply Current, 93% Efficiency,
1.23V ≤ V_OUT ≤ 18V; 2.8V ≤ V_IN ≤ 20V
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, 550kHz, V_OUT ≥ 0.8V
2.5V ≤ V_IN ≤ 9.8V; 90% Efficiency
95% Efficiency, 2.5V ≤ V_IN ≤ 5.5V, V_OUT ≥ 0.8V,
TSSOP16 Exposed Pad Package
2.5V ≤ V_IN ≤ 5.5V, Single Inductor
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^q FAX: [phone] ^q www.linear.com
3801f
LT/TP 1103 1K • PRINTED IN THE USA
© LINEAR TECHNOLOGY CORPORATION 2003