LTC3873-5 Datasheet, PDF (16/16 Pages) Linear Technology – No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller

LTC3873-5
TYPICAL APPLICATION
5V Output Nonisolated Telecom Housekeeping Power Supply
4.7μF
100V
X5R
56k
2.2nF
221k
V_IN
36V TO 72V
5.1V
10μF
0.1μF
V_CC
I_TH NGATE
LTC3873-5
RUN/SS
GND
SW
IPRG
V_FB
12k
36k
UPS840
T1
•
D1
•
300μF
6.3V
X5R
s3
V_OUT
5V
2A MAX
FDC2512
68mΩ
38735 TA03
D1: MBR0540T1
T1: COOPER CTX02-15242
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PART NUMBER
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LTC1624
LTC1700
LTC1871-7
LTC1872/LTC1872B
LT1930
LT1931
LTC3401/LTC3402
LTC3704
LTC1871/LTC1871-7
LTC3703/LTC3703-5
LTC3803/LTC3803-5
LTC3805
LT3825
LT3837
LTC3873
DESCRIPTION
Current Mode PWM Controller
Current Mode DC/DC Controller
No R_SENSE Synchronous Step-Up Controller
Wide Input Range Controller
SOT-23 Boost Controller
1.2MHz, SOT-23 Boost Converter
Inverting 1.2MHz, SOT-23 Converter
1A/2A 3MHz Synchronous Boost Converters
Positive-to Negative DC/DC Controller
No R_SENSE, Wide Input Range DC/DC Boost Controller
100V Synchronous Controller
200kHz Flyback DC/DC Controller
Adjustable Frequency Flyback Controller
Isolated No-Opto Synchronous Flyback Controller
Isolated No-Opto Synchronous Flyback Controller
No R_SENSE Constant Frequency Boost/Flyback/SEPIC
Controller
COMMENTS
300kHz Fixed Frequency, Boost, SEPIC, Flyback Topology
SO-8; 300kHz Operating Frequency; Buck, Boost, SEPIC Design;
V_IN Up to 36V
Up to 95% Efficiency, Operating as Low as 0.9V Input
No R_SENSE, 7V Gate Drive, Current Mode Control
Delievers Up to 5A, 550kHz Fixed Frequency, Current Mode
Up to 34V Output, 2.6V V_IN 16V, Miniature Design
Positive-to Negative DC/DC Conversion, Miniature Design
Up to 97% Efficiency, Very Small Solution, 0.5V ≤ V_IN ≤ 5V
No R_SENSE, Current Mode Control, 50kHz to 1MHz
No R_SENSE, Current Mode Control, 2.5V ≤ V_IN ≤ 36V
Step-Up or Step Down, 600kHz, SSOP-16, SSOP-28
V_IN and V_OUT Limited Only by External Components
V_IN and V_OUT Limited Only by External Components
V_IN: 24V to 75V, Up to 80W, Current Mode Control
V_IN: 4.5V to 20V, Up to 60W, Current Mode Control
V_IN and V_OUT Limited Only by External Components, 200kHz Frequency,
ThinSOT or DFN Package
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
38735fb
LT 0908 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2007