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Analog Devices Inc. LT3970HMS-5#TRPBF
- Part No.:
- LT3970HMS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3970HMS-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 350MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,728
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Product details
Overview
LT3970HMS-5#TRPBF from Analog Devices is a 40V, 350mA fixed-output step-down regulator with 2.5µA quiescent current, integrated boost and catch diodes, and 5V output voltage. It operates from 4.2V to 40V input, supports 200kHz–2.2MHz adjustable switching frequency, and features power good flag, accurate enable threshold (1V), and AEC-Q100 qualification for automotive battery regulation.
For engineers reviewing the LT3970HMS-5#TRPBF datasheet, LT3970HMS-5#TRPBF pinout, LT3970HMS-5#TRPBF application, or LT3970HMS-5#TRPBF equivalent, key selection criteria include its H-grade (–40°C to 150°C) junction temperature rating, MSOP-10 package, low-noise Burst Mode operation (<5mVP-P ripple), and integrated diode architecture eliminating external components in space-constrained 5V supply designs.
Technical Context
The LT3970HMS-5#TRPBF implements constant-frequency current-mode control with internal compensation, enabling fast transient response and stable loop behavior across wide input ranges. Its bipolar NPN switch is driven via an external BOOST capacitor to ensure full saturation, while the integrated catch diode includes valley-current limiting (400mA typical) for short-circuit protection.
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), with 12mV hysteresis. The device draws only 0.7µA in shutdown and accepts precise 1V enable threshold with 30mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1% over –40°C to 150°C; enables direct replacement of linear regulators in 5V rail generation. |
| Input Voltage Range | 4.2V to 40V; supports automotive battery transients (e.g., load dump up to 40V) without external clamping. |
| Max Output Current | 350mA continuous; limited by integrated catch diode valley current (400mA typ) and switch peak current (700mA typ). |
| Quiescent Current | 2.5µA at 12VIN→5VOUT; enables always-on systems like telematics and ECU sleep modes with ultra-low standby drain. |
| Switching Frequency | 200kHz to 2.2MHz via RT resistor; allows optimization of inductor size (e.g., 22µH at 600kHz) vs. efficiency trade-offs. |
| Output Ripple | <5mVP-P in Burst Mode; meets noise-sensitive analog/RF supply requirements without additional LC filtering. |
| Enable Threshold | 1.0V rising edge (±60mV); provides clean, hysteresis-stabilized startup control compatible with microcontroller GPIOs. |
Pinout & Package
LT3970HMS-5#TRPBF is housed in a 10-lead plastic MSOP package (3mm × 3mm footprint, 1.1mm height) with exposed pad for thermal dissipation (θJA = 100°C/W). Pin 1 is FB/VOUT (tied internally to fixed 5V divider), Pin 2 is EN, Pin 3 is VIN, Pins 4 & 5 are GND, Pin 6 is SW, Pin 7 is BOOST, Pin 8 is BD, Pin 9 is PG, and Pin 10 is RT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/VOUT (Pin 1) | Fixed-output feedback node | Internally connected to 5V regulation divider; no external resistors required - simplifies layout and eliminates resistor tolerance errors. |
| EN (Pin 2) | Enable control input | Hysteretic 1V threshold ensures noise-immune startup/shutdown; tie to VIN for always-on operation. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and switch; requires local 1µF–4.7µF X7R ceramic bypass within 3mm of pin. |
| GND (Pins 4, 5) | Power ground return | Dual GND pins reduce ground impedance; must connect to solid PCB ground plane under exposed pad. |
| SW (Pin 6) | Switch node output | Drives external inductor; high dv/dt node requiring tight loop area with inductor and catch diode. |
| BOOST (Pin 7) | Bootstrap drive voltage | Requires 0.22µF ceramic capacitor to SW; generates >VIN voltage to fully saturate internal NPN switch. |
| BD (Pin 8) | Boost diode anode | Connects to cathode of external boost diode; also powers internal bias regulator when >3.2V (e.g., from VOUT). |
| PG (Pin 9) | Open-drain power good | Sinks current when VOUT < 4.5V; requires external pull-up to monitor 5V rail health in safety-critical systems. |
| RT (Pin 10) | Frequency programming | Resistor to GND sets switching frequency (e.g., 226kΩ = 600kHz); enables EMI tuning and component size optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost & catch diodes | Eliminates 2 external diodes and associated layout area; reduces BOM count and improves reliability in harsh environments. |
| AEC-Q100 qualified H-grade | Rated for –40°C to 150°C junction temperature; validated for automotive under-hood applications including engine control modules. |
| Low-ripple Burst Mode | Maintains <5mVP-P output ripple at light loads while drawing only 1.7µA - critical for noise-sensitive sensors and RF circuits. |
| Internal current limit protection | Combines 700mA switch peak limit and 400mA catch diode valley limit to prevent damage during output shorts or startup surges. |
| Accurate power good flag | Asserts at 90% of 5V (4.5V) with 12mV hysteresis; provides deterministic system reset timing without external comparators. |
Applications
| Automotive Battery Regulation | Industrial Sensor Power |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery to stable 5V for infotainment head units and ADAS cameras. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, ripple-controlled 5V rail with load dump immunity up to 40V. Use Value: AEC-Q100 H-grade rating and integrated diodes eliminate need for external TVS and discrete diodes, reducing board area by >30%. | Use Scenario: Powering precision analog sensors (e.g., pressure, temperature) in factory automation PLCs. IC Role / Device Role / Timing Role: Low-noise 5V supply delivering sub-5mVP-P ripple to ADC reference inputs and op-amp rails. Use Value: Burst Mode operation maintains 1.7µA quiescent current during sensor sleep cycles, extending battery life in wireless nodes. |
| Portable Medical Device Supply | Telematics Control Unit |
Use Scenario: Generating 5V from single-cell Li-ion (3.0–4.2V) or dual-cell packs (6–8.4V) in handheld diagnostic tools. IC Role / Device Role / Timing Role: Wide-input buck converter supporting cold-cranking (4.2V min) and hot-swap conditions without brownout. Use Value: 2.5µA quiescent current extends standby time to >1 year on coin-cell backup; MSOP-10 fits compact handheld enclosures. | Use Scenario: Powering GPS/GSM modules and microcontrollers in vehicle tracking units operating across 9–36V battery range. IC Role / Device Role / Timing Role: Primary 5V regulator with PG flag enabling safe firmware boot sequencing and watchdog-triggered reset. Use Value: Power good assertion at 4.5V ensures MCU only exits reset after stable 5V rail is established - preventing corrupted boot sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMS-5#TRPBF | Same 5V fixed output, but uses CMOS switch (lower VCE(SAT)), higher 500mA IOUT, and 3.5µA IQ. | Optimized for higher load current and lower dropout; lacks AEC-Q100 qualification and integrated catch diode. | Select when >350mA output or <100mV dropout is required; verify thermal design for CMOS switch in high-temp environments. |
| TPS62130ARGTR | 3V–17V input, 5V fixed output, 3A capability, 17µA IQ, no integrated catch diode, QFN-16 package. | Higher current, lower cost, but requires external diode and lacks automotive qualification or ultra-low IQ. | Choose for non-automotive industrial applications needing >350mA; accept larger board area and higher standby current. |
Compared with LTC3630EMS-5#TRPBF and TPS62130ARGTR, LT3970HMS-5#TRPBF uniquely combines AEC-Q100 H-grade qualification, integrated diodes, and 2.5µA quiescent current - making it the only option for space-constrained, ultra-low-power automotive 5V rails where reliability and component count are critical.
Availability
LT3970HMS-5#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor power, portable medical devices, and telematics control units requiring stable component supply with guaranteed long-term availability.
Supply support for LT3970HMS-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 industrial, automotive, communications, and healthcare markets.
The LT3970 series was designed specifically for automotive and industrial DC/DC conversion where wide input range, ultra-low quiescent current, and AEC-Q100 reliability are mandatory - with LT3970HMS-5#TRPBF targeting 5V rail generation in engine control and infotainment systems.
FAQ
What is the maximum input voltage rating for LT3970HMS-5#TRPBF?
The absolute maximum input voltage for LT3970HMS-5#TRPBF is 40V, as specified in the Absolute Maximum Ratings table. This rating applies to both continuous operation and transient conditions such as automotive load dump. Exceeding 40V may cause permanent damage. During normal operation, the practical maximum input depends on switching frequency and duty cycle constraints - for example, at 600kHz, VIN(OP-MAX) ≈ 36V to maintain regulation stability. Always refer to the "Input Voltage Range" section of the datasheet for design-specific limits.
Does LT3970HMS-5#TRPBF require external diodes?
No, LT3970HMS-5#TRPBF does not require external diodes because it integrates both the boost diode and catch diode on-die. The BD pin connects to the anode of the internal boost diode, and the SW pin interfaces directly with the inductor and output capacitor - eliminating two external components and reducing PCB area and BOM cost. This integration is confirmed in the "Features" and "Block Diagram" sections of the datasheet, and is a defining characteristic of the LT3970 family.
What is the purpose of the BOOST pin on LT3970HMS-5#TRPBF?
The BOOST pin on LT3970HMS-5#TRPBF supplies gate drive voltage to the internal bipolar NPN power switch. An external 0.22µF ceramic capacitor between BOOST and SW generates a voltage ~1.8V above VIN, ensuring full saturation of the switch for minimal conduction loss. This bootstrap configuration is essential for achieving the specified 175mV switch VCE(SAT) and high efficiency across the full 4.2V–40V input range. Incorrect BOOST capacitor placement or value degrades efficiency and thermal performance.
How does the power good (PG) flag operate on LT3970HMS-5#TRPBF?
The PG flag on LT3970HMS-5#TRPBF is an open-drain output that remains low until the regulated 5V output reaches 90% (4.5V) of its nominal value, then transitions high via an external pull-up resistor. It has 12mV hysteresis and is only valid when VIN > 4.2V and EN is high. This provides deterministic system-level power sequencing - for example, enabling a microcontroller to exit reset only after the 5V rail is stable. PG sink current is rated at 30–80µA, supporting standard 10kΩ pull-up configurations.
Is LT3970HMS-5#TRPBF pin-compatible with other LT3970 variants?
Yes, LT3970HMS-5#TRPBF is pin-compatible with all other LT3970 variants in the MSOP-10 package (e.g., LT3970HMS#TRPBF, LT3970HMS-3.3#TRPBF), sharing identical pinout, footprint, and thermal pad layout. The only functional difference is the internal feedback divider: LT3970HMS-5#TRPBF fixes VOUT to 5V, while the base LT3970HMS#TRPBF requires external resistors for adjustable output. This allows drop-in replacement in 5V designs without PCB changes.
LT3970HMS-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT3970HMS-5#TRPBF FAQ
1.How can I place an order for LT3970HMS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3970HMS-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 LT3970HMS-5#TRPBF reliable?
The price and inventory of LT3970HMS-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 LT3970HMS-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3970HMS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3970HMS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3970HMS-5#TRPBF?
LT3970HMS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3970HMS-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 LT3970HMS-5#TRPBF?
For technical support, including LT3970HMS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3970HMS-5#TRPBF requirements.
6.How does Aetrix verify that LT3970HMS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3970HMS-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 LT3970HMS-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3970HMS-5#TRPBF?
All LT3970HMS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3970HMS-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 LT3970HMS-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3970HMS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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