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Analog Devices Inc. LTC3112IFE#PBF
- Part No.:
- LTC3112IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3112IFE#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:623
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Product details
Overview
LTC3112IFE#PBF from Analog Devices (formerly Linear Technology) is a fixed-frequency synchronous buck-boost DC/DC converter with 4-switch single-inductor architecture, supporting 2.7V–15V input and 2.5V–14V output ranges, delivering up to 2.5A continuous output current at 5VOUT in PWM mode, and featuring output disconnect, current monitoring, and <1µA shutdown current - ideal for multi-source power systems in handheld RF transmitters and battery-backed industrial terminals.
For engineers reviewing the LTC3112IFE#PBF datasheet, LTC3112IFE#PBF pinout, LTC3112IFE#PBF application, or LTC3112IFE#PBF equivalent, key selection considerations include its seamless VIN-above/below/equal-VOUT regulation, selectable PWM/Burst Mode operation, 750kHz synchronizable switching frequency, internal N-channel MOSFETs with 40–60mΩ RDS(ON), and thermal shutdown with junction temperature derating above 125°C.
Technical Context
The LTC3112IFE#PBF implements a proprietary voltage-mode control loop with error amplifier output on COMP driving a 4-switch topology (A/B/C/D) to enable continuous conduction across buck, buck-boost, and boost modes without inductor current discontinuity. Its internal oscillator operates at 750kHz (adjustable 300kHz–1.5MHz via PWM/SYNC pin) and integrates a phase-locked loop for synchronization.
It features dual current limiting: an average current limit (6A typical) acting through FB injection and a fast peak limit (~10A) for hard short protection, plus reverse current limiting (–1A typical) on SW2/VOUT during boost operation. Thermal management relies on exposed-pad GND soldering and junction temperature-dependent current limit scaling above 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 15V - supports single/multi-cell Li-ion, backup capacitors, and wall adapters without external pre-regulation. |
| Output Voltage Range | 2.5V to 14V - programmable via FB resistor divider; enables 3.3V/5V/12V rails from variable sources. |
| Continuous Output Current | 2.5A at VIN ≥ 5V, VOUT = 5V, PWM mode - sufficient for RF power stages and LED drivers. |
| Switching Frequency | 750kHz (typical), synchronizable 300kHz–1.5MHz - balances EMI, efficiency, and inductor size in space-constrained designs. |
| Efficiency | Up to 95% - achieved using low-RDS(ON) internal N-MOSFETs (40–60mΩ) and optimized gate drive. |
| Shutdown Current | <1µA - preserves battery life in always-on backup systems and IoT edge nodes. |
| Output Current Monitor | 24µA/A linear sourcing from IOUT pin - enables precise load current measurement or closed-loop current regulation. |
Pinout & Package
The LTC3112IFE#PBF is housed in a thermally enhanced 20-lead plastic TSSOP package (FE grade) with exposed pad (Pin 21) that must be soldered to PCB ground for thermal and electrical integrity. Package dimensions: 6.5mm × 4.4mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power and signal ground reference | Exposed pad is primary thermal path; requires low-impedance PCB connection to minimize θJA (38°C/W). |
| PWM/SYNC (Pin 19) | Mode control and frequency sync input | DC voltage <0.5V enables Burst Mode (IQ = 50µA); >1.5V enables 750kHz PWM; 300–1500kHz square wave overrides internal oscillator. |
| RUN (Pin 7) | Enable/disable control | Drives IC into <1µA shutdown when pulled below 0.75V; hysteresis ensures clean turn-on/turn-off. |
| VIN (Pins 5, 6) | Main input supply | Accepts 2.7–15V; requires ≥10µF low-ESR ceramic bypass close to pins to suppress high-frequency switching noise. |
| VOUT (Pin 9) | Regulated output | Delivers up to 2.5A; requires ≥47µF low-ESR ceramic capacitor with short ground return for stability. |
| SW1 (Pins 15, 16) | Switch node A/B connection | Connects internal high-side (A) and low-side (B) N-MOSFETs to one end of external inductor; critical for EMI layout. |
| SW2 (Pins 12, 13) | Switch node C/D connection | Connects internal high-side (C) and low-side (D) N-MOSFETs to other inductor end; reverse current limiting active here. |
| BST1 (Pin 17) | Floating gate drive supply for SW1 | Requires 0.1µF ceramic capacitor to SW1; enables high-side N-MOSFET drive in buck mode. |
| BST2 (Pin 14) | Floating gate drive supply for SW2 | Requires 0.1µF ceramic capacitor to SW2; enables high-side N-MOSFET drive in boost mode. |
| FB (Pin 3) | Feedback voltage input | Sets output via resistor divider; 0.8V reference enables 2.5–14V adjustment; leakage <50nA ensures accuracy. |
| OVP (Pin 4) | Overvoltage protection input | Programmable OVP threshold (0.83V reference); protects downstream circuitry if VOUT exceeds safe level. |
| IOUT (Pin 8) | Current monitor output | Sources 24µA per ampere of SW2-to-VOUT current; used for analog current sensing or closed-loop regulation. |
| COMP (Pin 2) | Error amplifier output | Connects to FB via RC network for loop compensation; determines duty cycle and transient response. |
| VCC (Pin 18) | Internal regulator supply | Clamped at 4.2V; powers internal logic/drivers; requires 1µF ceramic bypass to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost regulation | Maintains regulated VOUT whether VIN is above, below, or equal to VOUT - eliminates need for separate buck/boost converters in multi-rail systems. |
| Output disconnect in shutdown | Isolates VOUT from VIN during RUN = low - prevents backfeed and enables true load isolation in battery backup applications. |
| Integrated current limit and OVP | Dual-stage current limiting (average + peak) plus programmable overvoltage protection ensure robust fault handling without external components. |
| Thermally adaptive current limit | Linearly reduces current limit above 150°C junction temperature and disables output above ~170°C - prevents thermal runaway in high-power or high-ambient conditions. |
| Inductor damping in sleep | 250Ω active pull-down on SW1/SW2 during Burst Mode or shutdown - suppresses inductor ringing and reduces EMI emissions. |
Applications
| Handheld RF Transmitter Power | Multi-Source Industrial Terminal |
|---|---|
Use Scenario: Portable UHF RFID reader powered by 2-cell Li-ion (6–8.4V) requiring stable 5V/2A for RF PA and digital core. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining 5V output as battery discharges from 8.4V → 6.0V, while providing current monitoring for battery fuel gauging. Use Value: Eliminates need for separate buck and boost stages; 95% efficiency at 2A extends runtime; <1µA shutdown preserves charge during idle. |
Use Scenario: Ruggedized inventory scanner with dual inputs: 12V wall adapter and 3.7V LiPo backup, requiring uninterrupted 3.3V/1.2A for MCU and display. IC Role / Device Role / Timing Role: Seamless source-agnostic regulator that transitions between 12V adapter and 3.7V battery without output glitch or reset. Use Value: Single-chip solution replaces OR-ing diodes + LDO; output disconnect prevents battery drain when AC is present; thermal shutdown protects under sustained load. |
| LED Lighting with Current Regulation | 12V Lead-Acid to 12V Stabilized Rail |
Use Scenario: Automotive interior lighting module powered from 9–16V vehicle bus, driving constant-current LED string at 350mA. IC Role / Device Role / Timing Role: Buck-boost controller regulating VOUT to set current-sense voltage; IOUT pin feeds ADC for closed-loop dimming control. Use Value: Maintains consistent LED brightness across wide input range; 24µA/A monitor resolution enables ±5% current accuracy without shunt resistor. |
Use Scenario: Telematics unit powered from aging 12V lead-acid battery (9–14.5V) requiring clean, regulated 12V/1.5A for cellular modem and GPS. IC Role / Device Role / Timing Role: "12V-in, 12V-out" buck-boost maintaining regulation during cranking dips (<9V) and alternator surges (>14V). Use Value: No brownouts or resets during engine start; 750kHz switching allows compact 4.7µH inductor; OVP protects against >15V alternator faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z (Monolithic Power) | 4-switch architecture, 2.8–16V input, 3–15V output, 2A max, 500kHz–2.2MHz sync, no integrated current monitor. | Lacks IOUT pin for analog current sensing; requires external sense resistor for current regulation. | Preferred where higher switching frequency (up to 2.2MHz) and smaller inductors are prioritized over current monitoring capability. |
| TPS63020DSJR (Texas Instruments) | 4-switch buck-boost, 2.5–5.5V input, 1.8–5.5V output, 3A max, 2.4MHz fixed, integrated current limit but no OVP or output disconnect. | Narrower input/output range; no programmable OVP or shutdown isolation - unsuitable for 12V systems or safety-critical backup rails. | Best suited for low-voltage portable devices (e.g., wearables) where 5V-only operation and ultra-small solution size are critical. |
Compared with MP2918GQ-Z and TPS63020DSJR, the LTC3112IFE#PBF uniquely combines wide 2.7–15V input, 2.5–14V output, integrated current monitor (24µA/A), output disconnect, and programmable OVP - making it the only option among the three qualified for industrial multi-source 12V systems with telemetry and fault logging requirements.
Availability
LTC3112IFE#PBF is available at Aetrix Electronics and suitable for handheld RF transmitters, multi-source industrial terminals, and LED lighting systems requiring stable component supply across extended temperature (-40°C to 125°C) and long product lifecycles.
Supply support for LTC3112IFE#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear power products, including the LTC3112 series.
The LTC3112IFE#PBF belongs to Linear's high-efficiency, wide-input-range buck-boost regulator family, designed specifically for demanding industrial, automotive, and portable applications where input voltage can vary above or below the required output rail.
FAQ
What is the maximum continuous output current of the LTC3112IFE#PBF?
The LTC3112IFE#PBF delivers up to 2.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode. At lower input voltages (e.g., VIN = 2.7V), output current is reduced due to thermal and switch limitations; refer to Figure G04 in the datasheet for derated curves. The LTC3112IFE#PBF uses internal N-MOSFETs with 40–60mΩ RDS(ON) to sustain this performance in its 20-pin TSSOP package.
Does the LTC3112IFE#PBF support output voltage regulation when input voltage equals output voltage?
Yes, the LTC3112IFE#PBF supports seamless regulation when VIN = VOUT using its 4-switch architecture - unlike traditional 2-switch buck-boost converters that exhibit discontinuity or inefficiency at unity ratio. In this mode, switches A and D conduct simultaneously to provide a direct path, while B and C refresh BST capacitors. This behavior is confirmed in the block diagram and operation section of the LTC3112IFE#PBF datasheet.
How does the IOUT pin on the LTC3112IFE#PBF function, and what is its accuracy?
The IOUT pin on the LTC3112IFE#PBF sources 24µA per ampere of SW2-to-VOUT output current, enabling analog current monitoring or closed-loop regulation. Accuracy is specified as ±4µA at 1.5A load (36µA total), ±2.4µA at 1.0A (24µA), and ±1.2µA at 0.5A (12µA) - verified across temperature and line/load conditions. The LTC3112IFE#PBF datasheet provides RC filter guidance for noise reduction in measurement circuits.
Can the LTC3112IFE#PBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3112IFE#PBF accepts a square-wave clock on the PWM/SYNC pin to override its internal 750kHz oscillator. The valid synchronization range is 300kHz to 1.5MHz, with minimum high/low pulse widths of 100ns required for reliable locking. This feature allows EMI reduction via spread-spectrum alignment or system-level clock domain synchronization - fully supported in the LTC3112IFE#PBF's PLL architecture.
What thermal design practices are required for reliable operation of the LTC3112IFE#PBF at full load?
Reliable full-load operation of the LTC3112IFE#PBF requires soldering the exposed thermal pad (Pin 21) to a dedicated PCB ground plane using ≥4 thermal vias (0.3mm diameter), connecting to inner-layer copper pours. The datasheet specifies θJA = 38°C/W for the TSSOP package; exceeding 125°C junction temperature triggers linear current derating. Layout guidelines in the LTC3112IFE#PBF datasheet emphasize minimizing SW1/SW2 loop area and separating power/ground paths to avoid coupling.
LTC3112IFE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3112IFE#PBF FAQ
1.How can I place an order for LTC3112IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112IFE#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 LTC3112IFE#PBF reliable?
The price and inventory of LTC3112IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3112IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112IFE#PBF?
LTC3112IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112IFE#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 LTC3112IFE#PBF?
For technical support, including LTC3112IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112IFE#PBF requirements.
6.How does Aetrix verify that LTC3112IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3112IFE#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 LTC3112IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3112IFE#PBF?
All LTC3112IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112IFE#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 LTC3112IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3112IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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