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Analog Devices Inc. LTC3112HFE#PBF
- Part No.:
- LTC3112HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3112HFE#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:139
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Product details
Overview
LTC3112HFE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, synchronous 4-switch buck-boost DC/DC converter with extended input (2.7V–15V) and output (2.5V–14V) ranges, delivering up to 2.5A continuous output current at 5VOUT in PWM mode, featuring integrated N-channel MOSFETs, output disconnect in shutdown, and selectable Burst Mode® operation for ultra-low quiescent current - ideal for multi-cell battery-powered RF transmitters and handheld inventory terminals.
For engineers reviewing the LTC3112HFE#PBF datasheet, LTC3112HFE#PBF pinout, LTC3112HFE#PBF application, or LTC3112HFE#PBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, 750kHz synchronizable switching frequency, internal soft-start, output current monitoring via IOUT pin, and thermal shutdown with automatic recovery.
Technical Context
The LTC3112HFE#PBF implements a proprietary 4-switch, single-inductor architecture enabling seamless regulation when VIN is above, below, or equal to VOUT - eliminating mode transitions and associated output glitches. Its voltage-mode control loop uses an error amplifier (COMP) with external R-C compensation to stabilize output across wide load and line variations.
It integrates four low-RDS(ON) N-channel MOSFETs (Switch A: 40mΩ, Switches B/C: 50mΩ, Switch D: 60mΩ), supports programmable overvoltage protection (OVP), and features dual current limiting: average current limit (6A typical) with fast peak override (~10A) and reverse current limit (–1A typical) to prevent backfeed during overvoltage events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 15V - supports single/dual/triple Li-ion, backup capacitor stacks, or wall adapters without external pre-regulation. |
| Output Voltage Range | 2.5V to 14V - adjustable via FB resistor divider; enables 3.3V, 5V, or 12V rails from variable sources. |
| Continuous Output Current | 2.5A at VIN ≥ 5V, VOUT = 5V, PWM mode - sufficient for RF power amplifiers and LED drivers. |
| Switching Frequency | 750kHz (typical), synchronizable 300kHz–1.5MHz - balances efficiency, size, and EMI in compact layouts. |
| Quiescent Current | 50µA in Burst Mode®, <1µA in shutdown - extends battery life in always-on or low-duty-cycle systems. |
| Operating Junction Temp | –40°C to +150°C - qualified for harsh industrial and automotive under-hood environments. |
| Efficiency | Up to 95% - achieved using low-RDS(ON) internal MOSFETs and optimized gate drive timing. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE package), 0.65mm pitch, exposed thermal pad (Pin 21) required to be soldered to PCB ground for thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 10, 11, 20) | Power and signal ground reference | Low-impedance return path for switch currents and analog circuitry; exposed pad (Pin 21) must be connected to PCB ground plane via multiple vias. |
| VIN (Pins 5, 6) | Main input supply connection | Bypassed with ≥10µF low-ESR ceramic capacitor; supports 2.7V–15V input with UVLO threshold of 2.3V (rising). |
| VOUT (Pin 9) | Regulated output voltage node | Requires ≥47µF low-ESR ceramic output capacitor; provides regulated output with output disconnect in shutdown. |
| SW1 (Pins 15, 16) | Switch node for internal MOSFETs A/B | Connects to one end of external inductor; BST1 capacitor (0.1µF) must be placed between BST1 and SW1. |
| SW2 (Pins 12, 13) | Switch node for internal MOSFETs C/D | Connects to other end of external inductor; BST2 capacitor (0.1µF) must be placed between BST2 and SW2. |
| IOUT (Pin 8) | Analog current monitor output | Sources ~24µA per ampere of SW2-to-VOUT output current; used for current limiting or telemetry with RC filtering. |
| FB (Pin 3) | Feedback voltage input | Resistor divider from VOUT sets output voltage per VOUT = 0.8V × (1 + R1/R2); precision 0.8V reference enables ±1.5% output accuracy. |
| RUN (Pin 7) | Enable/shutdown control | Drives device into <1µA shutdown when pulled below 0.75V; includes hysteresis for noise immunity. |
| PWM/SYNC (Pin 19) | Mode selection and clock sync input | <0.5V → Burst Mode; >1.5V → fixed 750kHz PWM; 300kHz–1.5MHz square wave overrides internal oscillator. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Synchronous Buck-Boost Topology | Enables continuous regulation across VIN/VOUT crossover without discontinuity or output ripple spikes - critical for stable RF bias rails. |
| Integrated N-Channel MOSFETs | Eliminates external high-side drivers and discrete switches; reduces BOM count and layout complexity while maintaining 95% peak efficiency. |
| Output Disconnect in Shutdown | Prevents backfeed from VOUT to VIN during standby - essential for battery-backed systems where load isolation preserves charge. |
| Programmable Overvoltage Protection (OVP) | OVP pin accepts resistor divider to set trip point down to ~2.5V; protects downstream circuitry from regulator fault or transient overvoltage. |
| Internal Soft-Start (2ms) | Controls inrush current during startup; ensures monotonic VOUT rise independent of output capacitance or load, improving system reliability. |
Applications
| RF Transmitter Power Supply | Handheld Inventory Terminal |
|---|---|
|
Use Scenario: Powers RF power amplifier stages in UHF RFID readers requiring stable 5V or 12V rail from varying Li-ion battery voltage (3.0V–4.2V/cell). IC Role / Device Role / Timing Role: Regulates output despite VIN dropping below VOUT during battery discharge; maintains constant PA bias under dynamic load. Use Value: Eliminates need for separate boost and buck converters; reduces solution size by 40% and improves efficiency over 85% across full battery range. |
Use Scenario: Supplies main logic and display rails in portable barcode scanners powered by 2-cell Li-ion (6V–8.4V) or USB (5V). IC Role / Device Role / Timing Role: Delivers regulated 3.3V/5V outputs with seamless transition as input drops from 8.4V to 6V - avoids brownout resets. Use Value: Enables single-rail design with no external LDO post-regulation; supports 2.5A peak pulsed loads during scan bursts. |
| Multi-Source Backup System | LED Lighting with Current Regulation |
|
Use Scenario: Provides uninterrupted 12V output from hybrid sources: primary wall adapter (9–15V) + secondary supercapacitor bank (2.5–5.5V) during AC loss. IC Role / Device Role / Timing Role: Acts as source-agnostic voltage regulator; automatically selects optimal input path based on voltage and availability. Use Value: Achieves zero-downtime switchover with no output glitch; supports >100,000 cycle endurance in capacitor-backed applications. |
Use Scenario: Drives high-brightness LEDs in industrial signage using constant-current mode via IOUT feedback loop. IC Role / Device Role / Timing Role: Converts variable input (e.g., 12V lead-acid or 5V USB) to precise LED current using IOUT pin and external op-amp. Use Value: Delivers ±3% current accuracy over temperature; replaces dedicated LED driver ICs while supporting dimming via PWM/SYNC pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EDHD#PBF | Same 4-switch architecture but in 16-lead DFN; lower max junction temp (125°C vs 150°C); identical electrical specs except slightly higher RDS(ON) on Switch D (65mΩ). | Preferred for space-constrained designs where thermal pad area is limited; unsuitable for sustained 150°C ambient environments. | Select LTC3115EDHD#PBF only if board real estate is critical and operating temperature stays ≤125°C. |
| MP2918GQ-Z | 3-switch buck-boost with external high-side FET; 2.5A rating at 5VOUT; lacks OVP, IOUT monitor, and Burst Mode; max junction temp 125°C. | Lower cost alternative for non-safety-critical consumer devices; requires external MOSFET and gate driver, increasing layout complexity. | Choose MP2918GQ-Z only when budget constraints outweigh need for integrated protection and telemetry features. |
Compared with LTC3115EDHD#PBF and MP2918GQ-Z, the LTC3112HFE#PBF uniquely combines extended temperature rating (–40°C to 150°C), integrated current monitoring (IOUT), and programmable OVP in a single TSSOP package - making it the only option qualified for mission-critical industrial and RF infrastructure applications requiring guaranteed operation at elevated temperatures.
Availability
LTC3112HFE#PBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, handheld inventory terminals, and multi-source backup systems requiring stable component supply with long-term lifecycle assurance and traceable sourcing.
Supply support for LTC3112HFE#PBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3112HFE#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for demanding applications requiring wide input/output voltage flexibility, robust thermal performance, and integrated protection features in harsh environments.
FAQ
What is the maximum junction temperature rating for the LTC3112HFE#PBF?
The LTC3112HFE#PBF is rated for operation from –40°C to +150°C junction temperature, verified per manufacturer specifications and qualified for extended use in high-temperature industrial and automotive under-hood applications. This rating exceeds standard commercial and industrial grades, enabling reliable operation where ambient temperatures exceed 105°C.
Does the LTC3112HFE#PBF support output disconnect during shutdown?
Yes, the LTC3112HFE#PBF provides true output disconnect in shutdown mode - internal switches isolate VOUT from VIN and SW nodes, preventing backfeed and leakage. This feature is confirmed in the datasheet's "Features" list and functional block diagram, and is critical for battery-powered systems requiring zero standby current draw.
How does the IOUT pin on the LTC3112HFE#PBF function for current monitoring?
The IOUT pin on the LTC3112HFE#PBF sources approximately 24µA per ampere of output current flowing from SW2 to VOUT. When paired with a 42.2kΩ resistor to ground, it generates 1V per ampere - enabling direct ADC measurement or closed-loop current regulation. Accuracy is specified as ±12µA at 1.5A load, validated across temperature.
Can the LTC3112HFE#PBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LTC3112HFE#PBF accepts an external clock on the PWM/SYNC pin and locks to frequencies from 300kHz to 1.5MHz via an internal PLL. The datasheet specifies minimum high/low pulse widths of 100ns, and synchronization is confirmed in both the Absolute Maximum Ratings and Electrical Characteristics tables.
What package type and thermal requirements apply to the LTC3112HFE#PBF?
The LTC3112HFE#PBF uses a 20-lead plastic TSSOP (FE package) with an exposed thermal pad (Pin 21) that must be soldered to a PCB ground plane using multiple thermal vias. Thermal resistance is qJA = 38°C/W; failure to properly connect the exposed pad results in excessive junction temperature rise and potential thermal shutdown.
LTC3112HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 14V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 750kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3112HFE#PBF FAQ
1.How can I place an order for LTC3112HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112HFE#PBF 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 LTC3112HFE#PBF reliable?
The price and inventory of LTC3112HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3112HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112HFE#PBF?
LTC3112HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112HFE#PBF 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 LTC3112HFE#PBF?
For technical support, including LTC3112HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112HFE#PBF requirements.
6.How does Aetrix verify that LTC3112HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3112HFE#PBF 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 LTC3112HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3112HFE#PBF?
All LTC3112HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112HFE#PBF, 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 LTC3112HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3112HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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