LINEAR TECHNOLOGY LT1676 User Guide
Summary
This high-efficiency step-down switching regulator is engineered for robust power conversion, handling exceptionally wide input voltages up to 60V. Featuring advanced True Current Mode Control and Adaptive Switch Drive, it ensures consistent performance across both heavy loads and light load conditions. Ideal for demanding sectors such as automotive DC/DC converters, telecommunications equipment, and battery charging systems. The documentation provides comprehensive details on electrical specifications, operating modes, package options, and typical application circuits for reliable integration.
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LT1676
Wide Input Range, High Efficiency, Step-Down Switching Regulator
FEATURES DESCRIPTIO Wide Input Range: 7.4V to 60V The LT®1676 is a wide input range, high efficiency Buck 700m A Peak Switch Current Rating (step-down) switching regulator. The monolithic die in- Adaptive Switch Drive Maintains Efficiency at High cludes all oscillator, control and protection circuitry. The Load Without Pulse Skipping at Light Load part can accept input voltages as high as 60V and contains True Current Mode Control an output switch rated at 700m A peak current. Current 100k Hz Fixed Operating Frequency mode control offers excellent dynamic input supply rejec- Synchronizable to 250k Hz tion and short-circuit protection. Low Supply Current in Shutdown: 30µA
The LT1676 contains several features to enhance effi-
Available in 8-Pin SO and PDIP Packages
ciency. The internal control circuitry is normally powered via the VCC pin, thereby minimizing power drawn directly APPLICATIO S from the VIN supply (see Applications Information). The action of the LT1676 switch circuitry is also load depen-
Automotive DC/DC Converters
dent. At medium to high loads, the output switch circuitry
Telecom 48V Step-Down Converters
EF FI CI EN CY maintains high rise time for good efficiency. At light loads,
Cellular Phone Battery Charger Accessories
rise time is deliberately reduced to avoid pulse skipping
IEEE 1394 Step-Down Converters
behavior. The available SO-8 package and 100k Hz switching fre- quency allow for minimal PC board area requirements. , LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO VIN Efficiency vs VIN and ILOAD 8V TO 50V
VIN SHDN VCC
MBR160 36.5k
LT1676
FB SYNC VC
2200p F VIN = 12V
VIN = 24V
GND 22k 100p F
VIN = 36V VIN = 48V
*65T #30 ON MAGNETICS 1676 F01
MPP #55030
ILOAD (m A)
1676 TA01
Figure 1
Page Summary Contents For LINEAR TECHNOLOGY LT1676 User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 16 |
| File Size | 140.15 KB |
| Published | June 01, 2026 |
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Frequently Asked Questions
What is the wide input voltage range for this regulator?
The LT1676 supports a very wide input range, accommodating voltages from 7.4V up to 60V.
How does the unit maintain high efficiency under varying load conditions?
It uses an Adaptive Switch Drive that maintains high efficiency at medium/high loads and keeps it stable at light loads to prevent pulse skipping.
What is the minimum current draw when operating in shutdown mode?
The supply current consumed in shutdown mode is very low, specified at 30µA.
Does the unit offer synchronizable operation?
Yes, the switching frequency can be synchronized (SYNC pin) up to a range of 130 kHz to 250 kHz.