Datasheet LTC3810-5 (Analog Devices)

LTC3810-5 60V Current Mode Synchronous Switching Regulator Controller
FeaTures DescripTion
n
High Voltage Operation: Up to 60V
The LTC®3810-5 is a synchronous step-down switching n
Large 1
Ω
Gate Drivers
regulator controller that can directly step-down voltages n
No Current Sense Resistor Required
from up to 60V, making it ideal for telecom and automo- n
Dual N-Channel MOSFET Synchronous Drive
tive applications. The LTC3810-5 uses a constant on-time n Extremely Fast Transient Response valley current control architecture to deliver very low duty n ±0.5% 0.8V Voltage Reference cycles with accurate cycle-by-cycle current limit, without n Programmable Output Voltage Tracking/Soft-Start requiring a sense resistor. n Generates 5.5V Driver Supply from Input Supply A precise internal reference provides 0.5% DC accuracy. A n Synchronizable to External Clock high bandwidth (25MHz) error amplifier provides very fast n Selectable Pulse Skip Mode Operation line and load transient response. Large 1Ω gate drivers n Power Good Output Voltage Monitor allow the LTC3810-5 to drive multiple MOSFETs for higher n Adjustable On-Time/Frequency: tON(MIN) < 100ns current applications. The operating frequency is selected n Adjustable Cycle-by-Cycle Current Limit by an external resistor and is compensated for variations n Programmable Undervoltage Lockout in VIN and can also be synchronized to an external clock n Output Overvoltage Protection for switching-noise sensitive applications. A shutdown n 5mm × 5mm QFN Package pin allows the LTC3810-5 to be turned off, reducing the supply current to 240µA.
applicaTions
Integrated bias control generates gate drive power from n 48V Telecom and Base Station Power Supplies the input supply during start-up or when an output short- n Networking Equipment, Servers circuit occurs, with the addition of a small external SOT23 n Automotive and Industrial Control Systems MOSFET. When in regulation, power is derived from the L, LT, LTC, LTM, Linear Technology, the Linear logo and No RSENSE are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective output for higher efficiency. owners. Protected by U.S. Patents including 5481178, 5847554, 6304066, 6476589, 6580258, 6677210, 6774611.
Typical applicaTion High Efficiency High Voltage Step-Down Converter Efficiency vs Load Current
VIN 100 13V TO 60V + 274k 100k 22µF VIN = 24V ION NDRV ZXMN10A07F 95 VIN = 42V PGOOD BOOST LTC3810-5 VRNG TG Si7450DP 0.1µF 10µH MODE/SYNC V EFFICIENCY (%) 90 1000pF OUT SW 12V/6A SS/TRACK EXTVCC DRVCC 14k SHDN INTVCC + 85 I MBR1100 270µF 0 1 2 3 4 5 6 TH SENSE+ 47pF LOAD CURRENT (A) 200k BG Si7450DP VFB 38105 TA01b SENSE– 5pF SGND BGRTN 1µF 1k 38105 TA01 38105fd 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts