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Analog Devices Inc. LTC3113EFE#PBF
- Part No.:
- LTC3113EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3113EFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:629
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Product details
Overview
LTC3113EFE#PBF from Analog Devices (formerly Linear Technology) is a wide-input, synchronous buck-boost DC/DC converter IC delivering up to 3A continuous output current with input/output voltage range of 1.8V–5.5V, fixed-frequency PWM or selectable Burst Mode operation, and low-noise architecture optimized for RF and precision instrumentation power rails.
For engineers reviewing the LTC3113EFE#PBF datasheet, LTC3113EFE#PBF pinout, LTC3113EFE#PBF application, or LTC3113EFE#PBF equivalent, key selection considerations include its 20-lead TSSOP package thermal performance (θJA = 31.5°C/W), programmable 300kHz–2MHz switching frequency via RT pin, integrated 30mΩ/35mΩ PMOS/NMOS switches, <1μA shutdown current, and seamless buck/buck-boost/boost mode transition without inductor current discontinuity.
Technical Context
The LTC3113EFE#PBF implements a proprietary four-switch synchronous buck-boost topology with voltage-mode control, enabling regulation when VIN is above, below, or equal to VOUT. Its error amplifier drives VC to modulate duty cycle across all modes, while dual current limiting-7.8A average input limit and 11.1A peak limit-ensures robust overcurrent protection.
Burst Mode operation reduces no-load input current to <55μA by gating switching pulses, while PWM mode maintains full 3A output capability. Reverse-current limiting (–1.0A typical) actively disables SW2's PMOS switch D during external backfeed, and internal soft-start (2ms nominal) enforces controlled VOUT ramp regardless of BURST pin state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, USB, and multi-rail systems without pre-regulation |
| Output Voltage Range | 1.8V to 5.5V - adjustable via FB resistor divider; 600mV feedback reference enables precise setpoint control |
| Continuous Output Current | 3A at VIN > 3.0V, VOUT = 3.8V - full load capability only in PWM mode; Burst Mode limits max load per VIN/VOUT ratio |
| Switching Frequency | 300kHz to 2MHz - programmed externally via RT-to-SGND resistor; higher frequencies reduce inductor size but increase switching loss |
| Efficiency | Up to 96% - achieved using integrated 30mΩ PMOS and 35mΩ NMOS power switches; peak efficiency occurs near mid-load in PWM mode |
| Shutdown Current | <1μA - enables ultra-low-power backup and battery-critical applications; output disconnect isolates load |
| Thermal Performance | θJA = 31.5°C/W (TSSOP) - requires exposed pad soldered to PCB ground plane for reliable 3A operation at 125°C junction temperature |
Pinout & Package
The LTC3113EFE#PBF is housed in a 20-lead plastic TSSOP package (4.4mm × 6.5mm × 1.1mm) with exposed thermal pad (Pin 21) that must be soldered to PCB ground for thermal integrity and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 4,5,6) | Power Input Supply | Accepts 1.8V–5.5V input; requires ≥47μF low-ESR capacitor placed adjacent to pins with short PGND return path |
| VOUT (Pins 2,3) | Regulated Output Node | Delivers up to 3A; connects to output capacitor (100μF typical); forms feedback divider with R1/R2 to FB |
| SW1 (Pins 15,16,17) | High-Side Switch Node A/B | Connects to one end of power inductor; carries bidirectional current in buck/boost transitions; minimize trace length for EMI control |
| SW2 (Pins 18,19) | Low-Side Switch Node C/D | Connects to other inductor end; reverse-current comparator monitors SW2 to disable PMOS switch D during backfeed |
| FB (Pin 13) | Feedback Input | Senses output voltage divider; 600mV reference sets VOUT = 0.6V × (1 + R2/R1); Thevenin resistance >100kΩ required for stable current limit |
| RT (Pin 9) | Oscillator Frequency Set | Resistor to SGND programs fSW: RT ≈ 90/fMHz kΩ; determines inductor size, ripple, and efficiency trade-offs |
| BURST (Pin 8) | Mode Selection Control | Logic-high enables Burst Mode (low IQ, reduced IOUT); logic-low forces fixed-frequency PWM (full 3A capability) |
| RUN (Pin 14) | Enable/Shutdown Input | Active-high; <0.3V disables IC with output disconnect; >1.2V enables with 2ms soft-start; supports system-level power sequencing |
| VC (Pin 12) | Error Amplifier Output | Drives compensation network (R-C from VC to FB); loop stability depends on component values selected per application notes |
| PGND (Pins 1,10,11,20,21) | Power Ground Return | Exposes thermal pad (Pin 21) - must be soldered to large copper area; primary heat dissipation path; low-impedance return for high di/dt currents |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck + boost stages; reduces BOM count, board space, and magnetic coupling issues in compact designs |
| Seamless mode transition | No inductor current discontinuity or loop transfer function shift between buck, buck-boost, and boost - ensures stable regulation across wide VIN/VOUT ratios |
| Integrated power MOSFETs | 30mΩ PMOS (Switch A/D) and 35mΩ NMOS (Switch B/C) reduce conduction loss and eliminate external gate drivers |
| Programmable switching frequency | 300kHz–2MHz range allows optimization for size (high f) vs. efficiency (low f) without changing controller IC |
| Output disconnect in shutdown | Prevents reverse current flow from VOUT to VIN during standby - critical for battery-powered systems with shared rails |
| Reverse-current limiting | –1.0A typical clamp on SW2 prevents damage when VOUT is externally forced above regulation (e.g., hot-swap, backup source) |
Applications
| Wireless Modems | Portable Instrumentation |
|---|---|
Use Scenario: Powering LTE/5G modem modules from single-cell Li-ion (3.0–4.2V) while maintaining stable 3.3V or 3.8V rail under burst transmit loads. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing regulated VCC to RF transceiver and baseband processor; handles dynamic load steps up to 3A with <20mV undershoot. Use Value: Seamless buck-to-boost transition avoids brownout during deep discharge; low-noise operation prevents RF desense; <1μA shutdown extends battery shelf life. |
Use Scenario: Supplying precision ADCs, DACs, and op-amps in handheld test equipment powered by 1.8–5.5V sources including USB, coin cell, or Li-ion. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source for analog signal chain; operates in fixed-frequency PWM mode to suppress switching noise in sensitive measurement bands. Use Value: 96% peak efficiency minimizes self-heating near temperature-sensitive sensors; 600mV FB reference enables ±0.5% output accuracy over temperature. |
| Backup Power Systems | Portable Barcode Readers |
Use Scenario: Maintaining real-time clock (RTC), SRAM, or microcontroller state during main power failure using supercapacitor or backup battery (2.5–5.5V). IC Role / Device Role / Timing Role: Bidirectional-capable regulator that can both charge backup storage and regulate output during outage; supports input voltages below and above VOUT. Use Value: Input voltage range down to 1.8V enables operation from deeply discharged backup sources; output disconnect prevents backup energy leakage during normal operation. |
Use Scenario: Powering laser diode drivers, CMOS image sensors, and decode processors in handheld scanners operating from 3.7V Li-ion or 5V USB. IC Role / Device Role / Timing Role: Main DC/DC converter delivering 3.3V/3A to imaging subsystem; Burst Mode reduces idle current to extend scan session duration. Use Value: 3A capability supports simultaneous laser activation and sensor readout; thermal-enhanced TSSOP package sustains performance in enclosed plastic housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#PBF | Higher 60V input rating, 4A output, spread-spectrum EMI reduction; larger 16-lead MSOP package; requires external MOSFETs | Targets automotive and industrial 12V/24V systems; not suitable for sub-6V portable designs due to minimum VIN = 3.2V | Select when input exceeds 5.5V or >4A output needed; avoid for space-constrained 1.8–5.5V battery apps. |
| TPS63020DSJR | Lower 0.9V–6.5V input, 2.4A output, 2.5MHz max fSW; smaller 10-pin SON package; no reverse-current limit or exposed thermal pad | Optimized for ultra-compact wearables; lacks reverse-current protection and thermal headroom for sustained 3A loads | Choose for cost-sensitive, low-power portable devices where 2.4A suffices and thermal derating is acceptable. |
Compared with LT8390AEMSE#PBF and TPS63020DSJR, the LTC3113EFE#PBF uniquely balances 3A output, 1.8V start-up, reverse-current protection, and TSSOP thermal performance in the 1.8–5.5V range - making it optimal for high-reliability portable instrumentation and wireless modems where input voltage varies widely and backfeed events occur.
Availability
LTC3113EFE#PBF is available at Aetrix Electronics and suitable for wireless modems, portable instrumentation, backup power systems, and portable barcode readers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3113EFE#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 semiconductors, serving precision, industrial, communications, and automotive markets.
The LTC3113EFE#PBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for noise-sensitive, wide-input-range portable and instrumentation applications demanding seamless buck-boost regulation and robust protection features.
FAQ
What is the maximum continuous output current of the LTC3113EFE#PBF?
The LTC3113EFE#PBF delivers up to 3A continuous output current when VIN > 3.0V and VOUT = 3.8V in PWM mode. At lower input voltages (e.g., VIN ≥ 1.8V, VOUT = 3.3V), the rated continuous output drops to 1.5A due to increased conduction losses and thermal constraints. Burst Mode further reduces maximum deliverable current based on input/output voltage ratio and efficiency.
Does the LTC3113EFE#PBF support output voltages below 1.8V?
No, the LTC3113EFE#PBF does not support output voltages below 1.8V. Its feedback reference is fixed at 600mV, and the datasheet specifies a minimum output voltage of 1.8V - determined by the internal error amplifier range and guaranteed performance across temperature. Attempting to set VOUT < 1.8V via external resistors results in regulation loss and undefined behavior.
How is the switching frequency programmed on the LTC3113EFE#PBF?
The switching frequency of the LTC3113EFE#PBF is programmed using an external resistor (RT) connected from Pin 9 (RT) to SGND. The relationship is RT ≈ 90 / fMHz kΩ - for example, a 90.9kΩ resistor sets fSW ≈ 1MHz. This resistor directly controls the internal oscillator and affects inductor sizing, efficiency, and EMI profile.
What thermal design requirements apply to the LTC3113EFE#PBF in TSSOP package?
The LTC3113EFE#PBF in 20-lead TSSOP requires its exposed thermal pad (Pin 21) to be soldered to a dedicated PCB ground plane with multiple thermal vias. With θJA = 31.5°C/W, sustaining 3A output at 125°C ambient demands ≥4 cm² copper area and ≤2°C/W board-level thermal resistance to maintain safe junction temperature.
Can the LTC3113EFE#PBF operate with input voltage lower than its output voltage?
Yes, the LTC3113EFE#PBF is explicitly designed for buck-boost operation and regulates correctly when VIN < VOUT (boost mode), VIN > VOUT (buck mode), or VIN ≈ VOUT (buck-boost mode). Its four-switch topology and proprietary control algorithm ensure continuous inductor current and stable regulation across all three regions without mode-hopping artifacts.
LTC3113EFE#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):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3113EFE#PBF FAQ
1.How can I place an order for LTC3113EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3113EFE#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 LTC3113EFE#PBF reliable?
The price and inventory of LTC3113EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3113EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3113EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3113EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3113EFE#PBF?
LTC3113EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3113EFE#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 LTC3113EFE#PBF?
For technical support, including LTC3113EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3113EFE#PBF requirements.
6.How does Aetrix verify that LTC3113EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3113EFE#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 LTC3113EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3113EFE#PBF?
All LTC3113EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3113EFE#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 LTC3113EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3113EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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