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Analog Devices Inc. LTC3112MPFE#TRPBF
- Part No.:
- LTC3112MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3112MPFE#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,553
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Product details
Overview
LTC3112MPFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input synchronous buck-boost DC/DC converter IC with 4-switch single-inductor architecture. It delivers up to 2.5A continuous output current at 5V with input range 2.7V–15V and output range 2.5V–14V, enabling seamless regulation when VIN is above, below, or equal to VOUT - ideal for multi-cell battery, backup capacitor, and industrial power rail applications.
For engineers reviewing the LTC3112MPFE#TRPBF datasheet, LTC3112MPFE#TRPBF pinout, LTC3112MPFE#TRPBF application, or LTC3112MPFE#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, 750kHz synchronizable switching frequency, selectable PWM/Burst Mode operation, internal N-channel MOSFETs (40–60 mΩ), and integrated output current monitor (24 µA/A).
Technical Context
The LTC3112MPFE#TRPBF implements a proprietary voltage-mode control algorithm with dual current-limit protection (average 6A peak, reverse –1A), soft-start (2ms), and overvoltage protection (OVP threshold 0.83V). Its 4-switch topology enables continuous conduction mode across buck, buck-boost, and boost transitions without inductor current discontinuity.
It features an error amplifier with COMP/FB loop compensation, independent VCC regulator clamped at 4.2V, and thermally enhanced 20-pin TSSOP package with exposed GND pad. The device supports external synchronization (300–1500 kHz), shutdown current <1 µA, and output disconnect during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 15V - supports single/dual/triple Li-ion, 12V lead-acid, or backup capacitor stacks without pre-regulation. |
| Output Voltage Range | 2.5V to 14V - adjustable via FB resistor divider; regulated output remains stable regardless of VIN vs VOUT relationship. |
| Continuous Output Current | 2.5A at VIN ≥5V, VOUT=5V, PWM mode - sufficient for RF transmitters, LED drivers, and handheld terminals. |
| Switching Frequency | 750kHz (typical), synchronizable 300–1500kHz - enables compact magnetics and EMI optimization in space-constrained designs. |
| Efficiency | Up to 95% - achieved using low RDS(ON) internal N-MOSFETs (40–60 mΩ) and optimized gate drive. |
| Operating Temperature | –55°C to +150°C - qualified for harsh-environment industrial, aerospace, and defense applications. |
| Shutdown Current | <1 µA - preserves battery life in always-on or low-power standby systems. |
Pinout & Package
Package: 20-lead plastic TSSOP with exposed thermal pad (Pin 21 = GND); dimensions 6.5mm × 4.4mm × 1.1mm; θJA = 38°C/W, θJC = 4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power & signal ground reference | Exposed pad must be soldered to PCB ground plane for thermal management and low-impedance return path. |
| COMP (Pin 2) | Error amplifier output | Connect R-C network to FB to stabilize voltage loop; determines duty cycle for output regulation. |
| FB (Pin 3) | Feedback voltage input | Sets output voltage via resistor divider; reference = 0.8V ±2.5% - enables precise 2.5V–14V adjustment. |
| OVP (Pin 4) | Overvoltage protection input | Programmable OVP threshold (0.83V reference) protects downstream circuitry from overvoltage faults. |
| VIN (Pins 5, 6) | Main input supply | Accepts 2.7–15V; requires ≥10µF low-ESR ceramic bypass close to pins to suppress input ripple and noise. |
| RUN (Pin 7) | Enable/shutdown control | Logic-high (>0.75V) enables operation; logic-low (<0.35V) disables converter and reduces IQ to <1 µA. |
| IOUT (Pin 8) | Current monitor output | Sources 24 µA per ampere of SW2-to-VOUT current - enables analog current sensing or programmable current limiting. |
| VOUT (Pin 9) | Regulated output | Delivers up to 2.5A; requires ≥47µF low-ESR ceramic capacitor placed adjacent to pin for stability and transient response. |
| SW2 (Pins 12, 13) | Switch node C/D connection | Connects internal switches C/D and external inductor; critical for boost/buck-boost operation and EMI layout. |
| BST2 (Pin 14) | Floating gate driver supply for switch D | Requires 0.1µF ceramic capacitor to SW2 to sustain high-side N-MOSFET gate drive during boost phase. |
| SW1 (Pins 15, 16) | Switch node A/B connection | Connects internal switches A/B and same external inductor; shared node enables 4-switch topology with single inductor. |
| BST1 (Pin 17) | Floating gate driver supply for switch A | Requires 0.1µF ceramic capacitor to SW1 - ensures robust high-side drive in buck and buck-boost modes. |
| VCC (Pin 18) | Internal bias supply | Regulated to ~4.2V; powers control circuitry and gate drivers; bypass with 1µF ceramic to GND. |
| PWM/SYNC (Pin 19) | Mode control & frequency sync | DC <0.5V = Burst Mode (IQ = 50 µA); >1.5V = fixed 750kHz PWM; square wave = sync 300–1500kHz. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Single-Inductor Architecture | Enables seamless buck/boost/buck-boost transitions without output voltage droop or inductor current reversal. |
| Integrated Output Current Monitor | 24 µA/A linear current-sense output enables real-time load monitoring or closed-loop current regulation without sense resistor. |
| Thermally Enhanced TSSOP Package | 20-pin TSSOP with exposed GND pad achieves θJA = 38°C/W - supports 2.5A continuous output at –55°C to +150°C ambient. |
| Programmable Overvoltage Protection | OVP threshold set by external resistor divider (0.83V reference) - prevents damage to connected loads during regulation failure. |
| Inductor Damping in Sleep Mode | 250Ω active damping from SW1/SW2 to GND minimizes ringing and EMI during Burst Mode or shutdown. |
Applications
| Handheld Inventory Terminals | RF Transmitters |
|---|---|
Use Scenario: Portable barcode scanners powered by 2–3 Li-ion cells (6–12.6V) requiring stable 3.3V or 5V rail for MCU and display. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining constant output despite battery voltage sag from 12.6V down to 6V. Use Value: Eliminates need for separate buck and boost converters; extends runtime by operating efficiently across full battery discharge curve. | Use Scenario: UHF RFID readers or narrowband IoT transceivers needing clean 5V/2.5A supply from variable 7–12V input (e.g., PoE or wall adapter). IC Role / Device Role / Timing Role: High-current, low-noise DC/DC converter delivering regulated power to PA stage and RF front-end. Use Value: 95% efficiency and 750kHz fixed-frequency operation reduce thermal load and simplify EMI filtering versus lower-frequency alternatives. |
| LED Lighting with Current Regulation | Multiple Power Input Systems |
Use Scenario: Industrial LED signage powered from 12V lead-acid or 24V bus, requiring constant-current drive for strings up to 14V forward voltage. IC Role / Device Role / Timing Role: Buck-boost controller supplying precise voltage to external LED driver IC or analog current sink. Use Value: 2.5V–14V adjustable output matches diverse LED string configurations; IOUT pin enables feedback for closed-loop current control. | Use Scenario: Ruggedized embedded controller accepting inputs from USB, 12V automotive, or supercapacitor backup - all feeding single 5V system rail. IC Role / Device Role / Timing Role: Universal input regulator that auto-adapts to any source (VIN >, <, or = VOUT) without manual reconfiguration. Use Value: Single-component solution replaces multiple discrete regulators; simplifies BOM and improves reliability in multi-source power architectures. |
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#TRPBF | 16-pin DFN, –40°C to 125°C grade, 3A output, 4MHz max frequency | Higher switching frequency enables smaller inductors; lower temp grade limits use in extended-range environments | Select when board space is constrained and extended temperature is not required. |
| MAX20406AATG+T | 20-pin TQFN, –40°C to 125°C, 3.5A output, 2.2MHz max frequency, I²C programmable | Digitally configurable via I²C; lacks analog current monitor (IOUT) and extended –55°C rating | Choose for designs requiring dynamic voltage scaling or telemetry, not extreme-temperature operation. |
Compared with LTC3115EDHD#TRPBF and MAX20406AATG+T, the LTC3112MPFE#TRPBF uniquely combines –55°C to +150°C qualification, analog current monitoring, and seamless wide-VIN/VOUT regulation in a mature, production-proven TSSOP package - making it optimal for mission-critical industrial and defense power systems where reliability across temperature extremes is non-negotiable.
Availability
LTC3112MPFE#TRPBF is available at Aetrix Electronics and suitable for industrial automation, aerospace avionics, and ruggedized handheld terminals requiring stable component supply under extreme thermal conditions.
Supply support for LTC3112MPFE#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 its legacy of high-performance power management ICs with rigorous qualification standards.
The LTC3112MPFE#TRPBF belongs to Linear's precision buck-boost regulator product line, designed specifically for applications demanding wide input/output voltage flexibility, high efficiency, and operation across extended industrial and military temperature ranges.
FAQ
What is the maximum continuous output current capability of the LTC3112MPFE#TRPBF?
The LTC3112MPFE#TRPBF delivers up to 2.5A continuous output current at 5V when VIN ≥ 5V and operating in PWM mode. This rating is validated across its full –55°C to +150°C operating junction temperature range and assumes proper thermal design with the exposed pad soldered to a large GND plane.
Does the LTC3112MPFE#TRPBF support synchronization to an external clock?
Yes, the LTC3112MPFE#TRPBF supports external synchronization via its PWM/SYNC pin. Applying a square-wave signal between 300kHz and 1500kHz overrides the internal 750kHz oscillator. The signal must maintain minimum high/low times of 100ns to ensure reliable locking, as confirmed in the device's Absolute Maximum Ratings and Electrical Characteristics tables.
How does the IOUT pin on the LTC3112MPFE#TRPBF function in practice?
The IOUT pin on the LTC3112MPFE#TRPBF sources 24 µA per ampere of current flowing from SW2 to VOUT. In practice, this enables analog current monitoring or programmable current limiting by routing IOUT through a resistor to ground - generating a voltage proportional to load current (e.g., 24 mV/A with 1kΩ), which can feed an ADC or comparator.
What is the purpose of the BST1 and BST2 pins on the LTC3112MPFE#TRPBF?
BST1 and BST2 are floating gate-driver supplies for the high-side N-channel MOSFETs (switches A and D). Each requires a 0.1µF ceramic capacitor connected to its respective switch node (SW1 or SW2) to generate the boosted voltage needed to fully enhance the high-side FETs during buck and boost phases - essential for achieving low RDS(ON) and high efficiency.
Is the LTC3112MPFE#TRPBF pin-compatible with other variants in the LTC3112 family?
Yes, the LTC3112MPFE#TRPBF shares identical pinout and footprint with all TSSOP-package variants (e.g., LTC3112EFE#TRPBF, LTC3112IFE#TRPBF), differing only in temperature grade and test screening. All 20-pin TSSOP versions use the same Pin 1–20 assignment and exposed pad (Pin 21 = GND), enabling drop-in replacement within the same package family.
LTC3112MPFE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3112MPFE#TRPBF FAQ
1.How can I place an order for LTC3112MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112MPFE#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 LTC3112MPFE#TRPBF reliable?
The price and inventory of LTC3112MPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112MPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3112MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112MPFE#TRPBF?
LTC3112MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112MPFE#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 LTC3112MPFE#TRPBF?
For technical support, including LTC3112MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112MPFE#TRPBF requirements.
6.How does Aetrix verify that LTC3112MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3112MPFE#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 LTC3112MPFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3112MPFE#TRPBF?
All LTC3112MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112MPFE#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 LTC3112MPFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3112MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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