LINEAR 2PB_3833 Constant On-Time High Step-Down Controllers User's Manual
Summary
This constant on-time DC/DC controller provides high step-down ratio power conversion through a buck topology, enabling ultra-stable, tightly regulated outputs at switching frequencies up to 2MHz. Ideal for sensitive applications—such as those in the automotive or industrial sector—that require precise power rails and exceptional noise mitigation from higher voltage inputs. The manual details its full operational range, transient response performance, and efficiency characteristics across various frequency loads, ensuring reliable system integration.
Page 1 Text Content
Constant On-Time High Step-Down Controllers
Constant on-time DC/DC buck topology controllers provide the highest step-down ratio power supplies. These controllers allow for tight frequency control, making them suitable for many fixed frequency applications. The LTC®3833 can operate up to 2MHz and still supply a tightly regulated output. High frequency operation is desired to mitigate noise interference, reduce solution size and provide excellent efficiency. A typical example is found in automotive applications when stepping down from a nominal battery voltage of 12V to 3.3V power rail at a high switching frequency to prevent interference to noise sensitive circuitry by operating above the 1.8MHz AM radio band.
Features Transient Response
n VIN Range: 4.5V to 38V
n VOUT Range: 0.6V to 5.5V
n 20ns Min On-Time for High Step-Down Ratios ILOAD
20A/DIV
n Controlled On-Time Valley Current Mode Control
n Synchronizable 200k Hz to 2MHz Frequency
n Powerful Onboard N-Channel Gate Drive
n Diff Amp for VOUT Sensing
n RSENSE or DCR Current Sense 50m V/DIV
n Output Tracking or Adjustable Soft Start
n Very Fast Transient Response
n Output Accuracy: ±0.25% at 25°C and ±0.67% 20A/DIV
over Temperature
5µs/DIV
LOAD STEP = 0A TO 20A VIN = 12V, VOUT = 1.5V LOUT = 0.47µH, COUT = 660µF + 200µF
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Page Summary Contents For LINEAR 2PB_3833 Constant On-Time High Step-Down Controllers User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 2 |
| File Size | 1.13 MB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the recommended application for high switching frequencies?
High frequency operation is desired to mitigate noise interference, reduce solution size and provide excellent efficiency.
Does this controller support current sensing on the output?
Yes, it offers R or DCR Current Sense capability.
How accurate is the voltage output under normal operating conditions?
The output accuracy is ±0.25% at 25°C and ±0.67% over Temperature.
What are the general input and output voltage ranges for the LTC3833?
The voltage range is listed as 4.5V to 38V IN and 0.6V to 5.5V OUT.