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Product Detailed Parameters
- Description：IC REG BUCK ADJ 350MA 10DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：4.2V
- Voltage - Input (Max)：62V
- Voltage - Output (Min/Fixed)：1.21V
- Voltage - Output (Max)：25V
- Current - Output：350mA
- Frequency - Switching：210kHz ~ 2.3MHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：10-WFDFN Exposed Pad
- Supplier Device Package：10-DFN (3x3)
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Overview
The LT3990IDD#PBF is a monolithic buck switching regulator from Analog Devices Inc., housed in a 10-DFN package with exposed pad. It supports an input voltage range of 4.2V to 62V and delivers up to 350mA output current. The adjustable output voltage ranges from 1.21V to 25V. Operating frequencies are adjustable between 210kHz and 2.3MHz. Quiescent current is 2.5uA, with shutdown current at 1.7uA. It operates within a junction temperature range of -40°C to 125°C.
Feature Summary
- Adjustable switching frequency allows optimization for efficiency or component size.
- Integrated high-efficiency switch and catch diode reduce external component count.
- Low quiescent current enables extended battery life in portable applications.
- Wide input voltage range accommodates various power source configurations.
Applications
- Battery-powered equipment requiring low standby current
- Industrial control systems with wide input voltage variations
- Portable instrumentation and measurement devices
- Automotive electronics operating under varying load conditions
Procurement Notes
Verify the specific suffix IDD indicates the DFN-10 package variant when ordering. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure thermal management design accounts for the exposed pad requirement in the 10-DFN footprint. Cross-reference pinouts with the latest datasheet revision to avoid assembly errors during PCB layout.
Selection Notes
Select this component when a wide input voltage range up to 62V is required alongside low static current consumption. The adjustable frequency feature permits trade-offs between inductor size and electromagnetic interference. Consider the 350mA output limit for load requirements. The DFN-10 package offers compactness but requires adequate thermal relief on the PCB for optimal heat dissipation during continuous operation.
Part Context
This part belongs to the LT3990 family of micropower step-down regulators designed for high-voltage, low-current applications. It shares architectural similarities with other members like the LT3991 but differs in output current capacity and package options. The series emphasizes energy efficiency through advanced control circuitry and integrated passive components, targeting space-constrained designs.
Replacement Considerations
LT3990EMSE#TRPBF serves as a functional equivalent offering identical electrical performance in a 16-MSOP package. Verify pin compatibility and thermal characteristics before substitution due to the different footprint dimensions and lead configuration.
