LT1681 Datasheet, PDF (20/20 Pages) Linear Technology – Dual Transistor Synchronous Forward Controller

LT1681
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No R_SENSE and ThinSOT are trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technolgy Corporation.
COMMENTS
Current Limit Protection, 100% of Duty Cycle
Up to 60V Input Supply, No Shoot-Through
V_IN to 60V, Good for Full-Bridge Applications
Smooth Operation at High Duty Cycle (95% to 100%)
60V Dual N-Channel MOSFET Controller
Excellent for 5V to 3.x Up to 50A
8-Pin MSOP; Synchronizable; Soft-Start; Current Mode
97% Efficiency; No Sense Resistor; 16-Pin SSOP
Power Good Output; Minimum Input/Output Capacitors;
3.5V ≤ V_IN ≤ 36V
Synchronizable 150kHz to 300kHz, V_IN to 36V
High Side Current Sense, Up to 60V Input
Use with the LT1681, Isolated Power Supplies, Contains
Voltage Margining, Optocoupler Driver, Synchronization Circuit
with the Primary Side
Up to 42A Output; 0.925V ≤ V_OUT ≤ 2V
Up to 42A Output; VRM 8.4; 1.3V ≤ V_OUT ≤ 3.5V
Burst Mode^® Operation; 16-Pin Narrow SSOP;
3.5V ≤ V_IN ≤ 36V
Mobile VID; 0.925V ≤ V_OUT ≤ 2V; 3.5V ≤ V_IN ≤ 36V
Current Mode; 550kHz; Very Small Solution Size
Up to 95% Efficiency, 550kHz, 2.65V ≤ V_IN ≤ 8.5V,
0.8V ≤ V_OUT ≤ V_IN, Synchronizable to 750kHz
GN16-Pin, 0.8V FB Reference
Current Mode; 550kHz; Small 16-Pin SSOP, V_IN < 9.8V
3.5V ≤ V_IN ≤ 36V, Power Good Output, 300kHz Operation
50W to 2kW Power Supply Design, Adaptive Direct Sense ZVS
Minimizes C_IN and C_OUT, 4V ≤ V_IN ≤ 36V, 300kHz
G28 Package, V_OUT = 0.6V to 1.75V 5-Bit Mobile VID,
Active Voltage Positioning I_MVP2, V_IN to 36V
V_OUT = 0.6V to 1.75V, Active Voltage Positioning I_MVP2,
V_IN to 36V
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]^q FAX:[phone] ^q www.linear-tech.com
1681f
LT/TP 0302 2K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001