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Analog Devices Inc. LTC3112HFE#TRPBF
- Part No.:
- LTC3112HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3112HFE#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
LTC3112HFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, synchronous 4-switch buck-boost DC/DC converter with seamless operation across input voltages above, below, or equal to output voltage. It delivers up to 2.5A continuous output current at 5VOUT (VIN ≥ 5V, PWM mode), supports 2.7V–15V input and 2.5V–14V output ranges, and operates at 750kHz (synchronizable 300kHz–1.5MHz). It is used in battery-powered RF transmitters requiring stable 5V/2.5A regulation from variable Li-ion or backup capacitor sources.
For engineers reviewing the LTC3112HFE#TRPBF datasheet, LTC3112HFE#TRPBF pinout, LTC3112HFE#TRPBF application, or LTC3112HFE#TRPBF equivalent, key selection criteria include its extended VIN/VOUT overlap range, integrated N-channel MOSFETs (40–60 mΩ RDS(ON)), output current monitoring via IOUT pin, <1µA shutdown current, and thermal robustness up to 150°C junction temperature.
Technical Context
The LTC3112HFE#TRPBF employs a proprietary 4-switch, single-inductor architecture enabling true buck-boost regulation without mode transitions or discontinuities in inductor current. Its voltage-mode control loop uses an error amplifier (COMP) with external compensation to maintain regulation across wide VIN/VOUT ratios.
It integrates dual floating gate drivers (BST1/BST2) for high-side N-MOSFETs, supports selectable PWM or Burst Mode® operation (50µA IQ), and includes active inductor damping during shutdown or sleep to suppress ringing. Overvoltage protection (OVP), reverse current limiting (–1A), and thermal shutdown (170°C disable, 160°C restart) are implemented on-die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 15V - supports single/multi-cell Li-ion, backup capacitors, or wall adapters without pre-regulation. |
| Output Voltage Range | 2.5V to 14V - adjustable via FB resistor divider; enables direct 3.3V, 5V, or 12V generation. |
| Continuous Output Current | 2.5A at VOUT = 5V, VIN ≥ 5V, PWM mode - sufficient for RF power stages and high-brightness LED drivers. |
| Switching Frequency | 750kHz fixed (300–1500kHz synchronizable) - balances efficiency, size, and EMI in compact layouts. |
| N-Channel MOSFET RDS(ON) | 40 mΩ (SW A), 50 mΩ (SW B/C), 60 mΩ (SW D) - minimizes conduction loss at high load currents. |
| Shutdown Current | <1µA - preserves battery life in always-on or low-duty-cycle systems. |
| Operating Junction Temp | –40°C to +150°C - qualified for industrial and harsh-environment applications. |
Pinout & Package
The LTC3112HFE#TRPBF is housed in a thermally enhanced 20-lead plastic TSSOP package (FE) with exposed pad (Pin 21) soldered to PCB ground for optimal thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power and signal ground reference | Exposed pad must be soldered to large copper plane; primary heat path and low-impedance return for high-current switches. |
| VIN (Pins 5, 6) | Main input supply connection | Bypassed with ≥10µF low-ESR ceramic; supports 2.7–15V input with UVLO at 2.3V (rising). |
| VOUT (Pin 9) | Regulated output voltage node | Requires ≥47µF low-ESR ceramic output capacitor; delivers up to 2.5A with tight regulation. |
| SW1 (Pins 15, 16) | Connection to internal switches A and B | Drives inductor in buck/buck-boost modes; requires 0.1µF BST1 capacitor to SW1. |
| SW2 (Pins 12, 13) | Connection to internal switches C and D | Drives inductor in boost/buck-boost modes; requires 0.1µF BST2 capacitor to SW2. |
| IOUT (Pin 8) | Current monitor output | Sources 24µA/A of switch-D output current - enables analog current sensing or programmable current limit. |
| PWM/SYNC (Pin 19) | Mode control and frequency sync input | <0.5V → Burst Mode (50µA IQ); >1.5V → PWM; 300–1500kHz square wave → synchronized operation. |
| RUN (Pin 7) | Enable/shutdown control | <0.75V (typ) disables converter and reduces IQ to <1µA; hysteresis prevents chatter near threshold. |
| FB (Pin 3) | Feedback voltage input | 0.8V reference; sets VOUT = 0.8V × (1 + R1/R2); supports 2.5–14V output adjustment. |
| OVP (Pin 4) | Overvoltage protection input | Triggers shutdown if VOUT exceeds 0.83V × (1 + R3/R4); protects downstream circuitry from overvoltage faults. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost regulation | Maintains continuous inductor current and stable output across VIN < VOUT, VIN = VOUT, and VIN > VOUT - eliminates voltage glitches during battery discharge. |
| Integrated 4-switch N-MOSFET topology | Eliminates need for external high-side drivers or discrete FETs; reduces BOM count and layout complexity in space-constrained designs. |
| Output current monitoring (IOUT) | Provides scalable 24µA/A analog current signal - enables real-time load monitoring or closed-loop constant-current control without sense resistors. |
| Active inductor damping | 250Ω switch-to-GND path during shutdown/Burst Mode suppresses inductor ringing and reduces EMI emissions by >15dB. |
| Thermal shutdown with hysteresis | Disables all switches at ~170°C and auto-restarts at ~160°C - prevents permanent damage while enabling graceful recovery after transient overloads. |
Applications
| RF Transmitter Power Supply | Multi-Source Industrial Backup System |
|---|---|
Use Scenario: Powering 5V RF PA stages in handheld inventory terminals where input varies from 3.6V (1S Li-ion) to 12.6V (3S Li-ion fully charged). IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining regulated 5V/2.5A output regardless of battery state-of-charge. Use Value: Eliminates need for separate buck and boost converters; ensures consistent RF output power across full battery voltage range. | Use Scenario: Providing uninterrupted 12V rail in factory automation controllers using hybrid input from 12V lead-acid battery and 15V wall adapter. IC Role / Device Role / Timing Role: Seamless voltage translator that regulates 12V output from either source without brownouts during switchover. Use Value: Enables true input-source redundancy with no output interruption - critical for PLCs and motion controllers. |
| LED Lighting with Current Regulation | High-Voltage Synchronous Boost Converter |
Use Scenario: Driving high-brightness white LEDs from 3.3V USB or 5V system rail in portable medical devices. IC Role / Device Role / Timing Role: Constant-current LED driver using IOUT pin feedback to regulate LED string current independent of forward voltage variation. Use Value: Achieves ±3% current accuracy without external sense resistor - improves LED lifetime consistency and simplifies thermal design. | Use Scenario: Generating 12V from 5V system bus in automotive infotainment head units requiring clean, ripple-free supply. IC Role / Device Role / Timing Role: High-efficiency synchronous boost converter operating in PWM mode at 750kHz with low EMI profile. Use Value: Delivers 12V/1.5A at >92% efficiency with minimal board area - replaces discrete boost IC + external MOSFET solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115IFE#TRPBF | Wider 2.7–40V input, lower 1.5A max output, 400kHz–3MHz sync range, same TSSOP-20 package. | Better suited for 24V industrial inputs; less suitable for high-current 5V loads due to reduced current capability. | Select when input may exceed 15V (e.g., 24V rail) and 1.5A output suffices. |
| MP2918GQ-Z | Monolithic 3.5A buck-boost, 4.5–36V input, 0.8–28V output, 500kHz fixed frequency, QFN-20 package. | Higher input voltage rating but lacks IOUT current monitor and Burst Mode; different pinout and compensation scheme. | Select for cost-sensitive 36V-input applications where current monitoring is not required. |
Compared with LTC3112HFE#TRPBF, LTC3115IFE#TRPBF extends input range at the expense of output current, while MP2918GQ-Z trades integrated current monitoring and ultra-low IQ for higher input voltage tolerance and simplified layout - choice depends on whether precision current sensing or wide VIN dominates the design priority.
Availability
LTC3112HFE#TRPBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, multi-source industrial backup systems, LED lighting with current regulation, and high-voltage synchronous boost converters requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3112HFE#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3112 belongs to Linear's high-performance power conversion family, designed specifically for demanding applications requiring seamless buck-boost regulation, wide input/output flexibility, and robust thermal performance in industrial and portable equipment.
FAQ
What is the maximum continuous output current of the LTC3112HFE#TRPBF?
The LTC3112HFE#TRPBF delivers up to 2.5A continuous output current when VOUT = 5V and VIN ≥ 5V in PWM mode. At other voltage combinations - such as 12VOUT from 12VIN - the achievable current is limited by thermal constraints and internal current limits (e.g., 4.5–8.5A input current limit depending on temperature). Derating applies above 85°C ambient.
Does the LTC3112HFE#TRPBF support output current monitoring, and how is it implemented?
Yes, the LTC3112HFE#TRPBF provides analog output current monitoring via the IOUT pin, which sources 24µA per ampere of switch-D output current. This signal can be converted to a voltage using a resistor to ground (e.g., 42.2kΩ yields 1V/A) for ADC measurement or fed into an op-amp for closed-loop current regulation - eliminating the need for lossy external sense resistors.
What is the operating temperature range of the LTC3112HFE#TRPBF, and how does it differ from other variants?
The LTC3112HFE#TRPBF is rated for –40°C to +150°C junction temperature, making it suitable for under-hood automotive or industrial environments. This differs from the E-grade (0°C to 125°C) and I-grade (–40°C to 125°C) variants. The H-grade qualification includes full electrical testing across this extended range, not just derated characterization.
Can the LTC3112HFE#TRPBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3112HFE#TRPBF supports external synchronization via the PWM/SYNC pin. A square-wave clock between 300kHz and 1.5MHz - with minimum high/low times of 100ns - overrides the internal 750kHz oscillator. This enables EMI reduction through frequency dithering or alignment with system clocks in noise-sensitive applications.
How does the LTC3112HFE#TRPBF handle short-circuit conditions on the output?
Under output short-circuit, the LTC3112HFE#TRPBF reduces its average current limit to approximately half the normal value and activates thermal shutdown if junction temperature exceeds ~170°C. It also disables switch D during reverse current events (>1A typical) and provides soft-start reset during fault recovery - ensuring safe, repeatable re-start without latch-up or component stress.
LTC3112HFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3112HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112HFE#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 LTC3112HFE#TRPBF reliable?
The price and inventory of LTC3112HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3112HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112HFE#TRPBF?
LTC3112HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112HFE#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 LTC3112HFE#TRPBF?
For technical support, including LTC3112HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112HFE#TRPBF requirements.
6.How does Aetrix verify that LTC3112HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3112HFE#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 LTC3112HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3112HFE#TRPBF?
All LTC3112HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112HFE#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 LTC3112HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3112HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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