My Inquiry
My Account
Analog Devices Inc. LT3970IMS-5#TRPBF
- Part No.:
- LT3970IMS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3970IMS-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 350MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,662
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3970IMS-5#TRPBF from Analog Devices is a 40V input, 350mA fixed-output 5V monolithic buck switching regulator with integrated boost and catch diodes, 2.5µA quiescent current, and low-ripple Burst Mode operation. It employs current-mode control for fast transient response and includes power good flag, accurate enable threshold, and internal compensation - used in automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3970IMS-5#TRPBF datasheet, LT3970IMS-5#TRPBF pinout, LT3970IMS-5#TRPBF application, or LT3970IMS-5#TRPBF equivalent, key selection considerations include its 5V fixed output, 10-pin MSOP package, AEC-Q100 qualification, 200kHz–2.2MHz programmable frequency, and 0.7µA shutdown current.
Technical Context
The LT3970IMS-5#TRPBF uses constant-frequency current-mode PWM control with an internal bipolar NPN switch, integrated Schottky catch and boost diodes, and internal 1.21V reference. Its feedback loop is internally compensated and regulates via VOUT pin (not FB) since it is the fixed 5V variant.
Burst Mode operation reduces quiescent current to 1.7µA at light loads while maintaining output ripple below 5mVP-P; the power good flag asserts when VOUT reaches 90% of 5V (i.e., 4.5V), and the enable pin has 1V rising threshold with 30mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% over –40°C to 125°C; enables direct replacement of linear regulators without external resistors. |
| Input Voltage Range | 4.2V to 40V operating; supports wide automotive battery transients and industrial unregulated rails. |
| Max Output Current | 350mA continuous; limited by valley current of integrated catch diode (min 350mA typ, 400mA max). |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT; enables always-on systems with multi-year battery life in portable applications. |
| Switching Frequency | Programmable 200kHz to 2.2MHz via RT resistor; allows optimization of inductor size vs. efficiency for space-constrained designs. |
| Shutdown Current | 0.7µA typical; ensures minimal system leakage during deep sleep or fault conditions. |
| Power Good Threshold | 90% of 5V (4.5V) with 12mV hysteresis; provides reliable sequencing and monitoring without external comparators. |
Pinout & Package
LT3970IMS-5#TRPBF is housed in a 10-lead plastic MSOP package (θJA = 100°C/W), with exposed pad not present (unlike DFN variant). All pins are surface-mount compatible and require standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOUT) | Regulated output sense & feedback node | Internally connected to fixed 5V divider; no external resistor required - simplifies layout and improves accuracy. |
| 2 (EN) | Enable control input | Hysteretic 1V rising threshold; tie to VIN for always-on operation or drive externally for controlled start-up/sequencing. |
| 3 (VIN) | Main power input | Supplies internal circuitry and switch; must be locally bypassed with ≥1µF X7R ceramic capacitor. |
| 4,5 (GND) | Analog and power ground | Dual GND pins reduce ground impedance; connect directly to PCB ground plane with short traces. |
| 6 (SW) | Switch node | Connects to inductor; carries high di/dt switching current - requires tight loop area and Kelvin routing. |
| 7 (BOOST) | Bootstrap drive voltage | Requires external capacitor to generate >VIN voltage; enables full saturation of internal bipolar NPN switch. |
| 8 (BD) | Boost diode anode / bias supply | Accepts external bias ≥3.2V (e.g., VOUT) to improve efficiency by powering internal regulator from output rail. |
| 9 (PG) | Open-drain power good flag | Active-low open-drain output; requires external pull-up to monitor 5V regulation status for system sequencing. |
| 10 (RT) | Frequency setting | Resistor-to-ground sets switching frequency; e.g., 226kΩ yields ~600kHz per datasheet Table 1. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost & catch diodes | Eliminates 2 external Schottky diodes, reducing BOM count, board area, and thermal stress in compact 10-pin MSOP. |
| Low-ripple Burst Mode | Maintains <5mVP-P output ripple at light loads while achieving 1.7µA IQ, critical for noise-sensitive analog or RF subsystems. |
| AEC-Q100 qualified (I-grade) | Rated for –40°C to +125°C junction temperature; validated for automotive battery regulation, infotainment, and ADAS power rails. |
| Internal compensation | Removes need for external compensation network - simplifies design, improves production yield, and ensures stable loop across all loads. |
| Accurate 1V enable threshold | ±60mV tolerance over temperature; enables precise power sequencing in multi-rail systems without external voltage supervisors. |
Applications
| Automotive Battery Regulation | Industrial Control Power |
|---|---|
|
Use Scenario: Regulating 12V/24V automotive battery rail to stable 5V for microcontrollers and CAN transceivers under cold-crank (4.2V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary step-down DC/DC converter providing isolated, ripple-controlled 5V supply with power good signaling for ECU boot validation. Use Value: AEC-Q100 qualification, 40V absolute max input, and 0.7µA shutdown current ensure reliability and low standby loss across vehicle lifecycle. |
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus controllers from unregulated 24V industrial supplies with wide line and load variation. IC Role / Device Role / Timing Role: Fixed-output buck regulator delivering clean 5V to logic and communication ICs with built-in PG flag for system health monitoring. Use Value: Integrated diodes and internal compensation reduce component count and layout sensitivity, accelerating industrial design certification. |
| Portable Medical Instrumentation | Smart Sensor Node Power |
|
Use Scenario: Supplying 5V to low-power ADCs, op-amps, and BLE radios in handheld diagnostic devices powered by single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: High-efficiency, ultra-low-IQ buck converter enabling multi-week operation on coin cells or extended runtime on rechargeables. Use Value: 2.5µA quiescent current and Burst Mode operation preserve battery capacity during idle/sleep states without sacrificing regulation accuracy. |
Use Scenario: Providing regulated 5V to MEMS sensors, ultra-low-power MCUs, and LoRaWAN transceivers in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Always-on power management IC that maintains system readiness while minimizing self-discharge in long-term deployments. Use Value: 0.7µA shutdown current and 1.7µA Burst Mode IQ extend 10-year field life in remote IoT nodes without maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SISM#TRPBF | 42V input, 2.5A output, 2.5µA IQ, synchronous rectification, 3mm × 4mm LQFN | Higher current capability and smaller footprint; lacks integrated boost diode - requires external bootstrap cap routing. | Choose for higher load demands (>350mA) or tighter space constraints where synchronous efficiency outweighs diode integration. |
| TPS54331DR | 28V input, 3A output, 4.5µA IQ, external diode, SOIC-8, no PG or BD pin | No power good flag, no boost diode anode pin, no AEC-Q100 rating; requires external catch diode and compensation. | Choose for cost-sensitive industrial applications where 5V fixed output and automotive qualification are not required. |
Compared with LT3970IMS-5#TRPBF, LT8609SISM#TRPBF delivers 7× more current in a smaller package but sacrifices integrated boost diode simplicity; TPS54331DR offers higher current and lower cost but adds design complexity and lacks automotive qualification and system-level features like PG and BD bias.
Availability
LT3970IMS-5#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control power, and portable medical instrumentation requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT3970IMS-5#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision, industrial, automotive, and communications markets.
The LT3970 series was designed as a family of high-voltage, low-quiescent-current buck regulators targeting automotive and industrial applications where input transients, small size, and ultra-low standby power are critical.
FAQ
What is the output voltage tolerance of the LT3970IMS-5#TRPBF over temperature?
The LT3970IMS-5#TRPBF delivers a fixed 5.0V output with ±1.2% tolerance over the full –40°C to +125°C operating junction temperature range, as specified in the Electrical Characteristics table for the IMS grade. This is achieved via laser-trimmed internal feedback resistors and a stable 1.21V reference, ensuring consistent performance without external calibration.
Does the LT3970IMS-5#TRPBF require an external catch diode?
No, the LT3970IMS-5#TRPBF integrates both the catch Schottky diode and boost Schottky diode on-die. This eliminates the need for external diodes, reduces PCB area, and improves thermal performance - confirmed in the Features list, Block Diagram, and Pin Functions section of the datasheet.
How does the BD pin function in the LT3970IMS-5#TRPBF?
The BD pin on the LT3970IMS-5#TRPBF serves dual roles: it connects to the anode of the internal boost diode and acts as an auxiliary bias input. When BD is held ≥3.2V (e.g., tied to VOUT), the internal regulator draws power from BD instead of VIN, improving conversion efficiency - especially at light loads and high input voltages.
What is the minimum recommended input capacitance for the LT3970IMS-5#TRPBF?
The LT3970IMS-5#TRPBF requires a minimum 1µF X7R or X5R ceramic capacitor placed as close as possible to the VIN and GND pins. Larger values (e.g., 2.2µF–4.7µF) are recommended for high-input-impedance sources or lower switching frequencies to suppress voltage ripple and minimize EMI from pulsed input current.
Is the LT3970IMS-5#TRPBF pin-compatible with other LT3970 variants in MSOP package?
Yes, all LT3970 variants - including LT3970IMS-5#TRPBF, LT3970IMS#TRPBF (adjustable), and LT3970IMS-3.3#TRPBF - share identical 10-pin MSOP pinouts and footprints. The only functional difference is pin 1: VOUT for fixed-output versions versus FB for adjustable versions, requiring no PCB redesign when substituting within the same package.
LT3970IMS-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 350mA
- Frequency - Switching:
- 200kHz ~ 2.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT3970IMS-5#TRPBF FAQ
1.How can I place an order for LT3970IMS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970IMS-5#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT3970IMS-5#TRPBF reliable?
The price and inventory of LT3970IMS-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3970IMS-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970IMS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970IMS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970IMS-5#TRPBF?
LT3970IMS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970IMS-5#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT3970IMS-5#TRPBF?
For technical support, including LT3970IMS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970IMS-5#TRPBF requirements.
6.How does Aetrix verify that LT3970IMS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970IMS-5#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3970IMS-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970IMS-5#TRPBF?
All LT3970IMS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970IMS-5#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT3970IMS-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3970IMS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3970IMS-5#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
