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Analog Devices Inc. LTC3113IFE#PBF
- Part No.:
- LTC3113IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3113IFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LTC3113IFE#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 and output voltage ranges 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 LTC3113IFE#PBF datasheet, LTC3113IFE#PBF pinout, LTC3113IFE#PBF application, or LTC3113IFE#PBF equivalent, key selection criteria include its 3A output capability at VIN > 3.0V/VOUT = 3.8V, programmable 300kHz–2MHz switching frequency, <1μA shutdown current, integrated soft-start, and thermal/short-circuit protection in the 20-lead TSSOP package.
Technical Context
The LTC3113IFE#PBF implements a four-switch synchronous buck-boost topology with proprietary mode-transition logic that enables seamless operation across buck, buck-boost, and boost regions without inductor current discontinuity or loop transfer function shifts. Its voltage-mode error amplifier drives gate drivers with anti-cross-conduction control and integrates peak and average current limiting circuits.
It features dual current limit mechanisms: a 7.8A average input current limit (active via FB injection) and an 11.1A peak switch current limit for hard short protection, plus a –1.0A reverse current limit on SW2 to prevent backfeed when VOUT exceeds regulation. Thermal shutdown activates at 155°C with hysteresis reset at ~145°C.
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 resistor divider on FB pin; regulated regardless of VIN vs VOUT relationship |
| Continuous Output Current | 3A at VIN > 3.0V, VOUT = 3.8V - full load available only in PWM mode; reduced in Burst Mode |
| Switching Frequency | 300kHz to 2MHz - set by RT-to-SGND resistor; higher frequencies enable smaller magnetics and faster transient response |
| Efficiency | Up to 96% - achieved with integrated 30mΩ/35mΩ PMOS/NMOS switches and synchronous rectification |
| Shutdown Current | <1μA - enables long battery life in standby; output disconnects from input during shutdown |
| Feedback Reference | 600mV ±2% - high-accuracy reference enables tight output regulation across temperature and load |
Pinout & Package
The LTC3113IFE#PBF is housed in a 20-lead plastic TSSOP package (4.4mm × 6.5mm × 1.1mm) with exposed thermal pad (Pin 21) connected to PGND. The package provides θJA = 31.5°C/W and θJC = 4.1°C/W for robust thermal performance in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 4,5,6) | Power Input | Primary input supply node; requires ≥47μF low-ESR capacitor directly to PGND with minimal trace length |
| VOUT (Pins 2,3) | Regulated Output | Converter output node; connects to bulk capacitor (≥100μF) and feedback divider; low-impedance path critical for stability |
| SW1 (Pins 15,16,17) | High-Side Switch Node | Connects internal switches A/B; ties to one end of power inductor; must be routed with minimal loop area to reduce EMI |
| SW2 (Pins 18,19) | Low-Side Switch Node | Connects internal switches C/D; ties to other end of power inductor; same layout priority as SW1 for noise control |
| FB (Pin 13) | Feedback Input | Senses output voltage via resistor divider; Thevenin resistance >100kΩ recommended for stable current limiting |
| VC (Pin 12) | Error Amplifier Output | Compensation node; connects R-C network to FB for loop stability; determines duty cycle per voltage-mode control |
| RUN (Pin 14) | Enable Control | Active-high logic input; <0.3V disables converter with output disconnect; >1.2V enables with internal soft-start |
| BURST (Pin 8) | Mode Selection | Logic-controlled mode selector: low = fixed-frequency PWM; high = Burst Mode for light-load efficiency |
| RT (Pin 9) | Oscillator Programming | Resistor-to-SGND sets switching frequency; RT ≅ 90/fMHz kΩ (e.g., 90.9kΩ = 1MHz) |
| SGND (Pin 7) | Signal Ground | Analog reference for FB, RT, VC; separate from PGND to avoid noise coupling into feedback path |
| PGND (Pins 1,10,11,20 + Exposed Pad 21) | Power Ground | Main return path for high-current switches; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables continuous regulation with VIN above, below, or equal to VOUT without mode-hopping artifacts or output glitches |
| Selectably enabled Burst Mode® operation | Reduces no-load input current to <55μA while maintaining regulation; ideal for battery-powered sleep states |
| Integrated 30mΩ/35mΩ PMOS/NMOS power switches | Eliminates external MOSFETs and gate drivers; reduces BOM count and layout complexity in space-constrained designs |
| Programmable 300kHz–2MHz switching frequency | Allows optimization between size (higher f), efficiency (lower f), and EMI (spread-spectrum not supported) |
| Internal soft-start (2ms typical) | Prevents inrush current and output overshoot during power-up; active during all startup conditions including Burst Mode entry |
| Comprehensive protection suite | Includes thermal shutdown (155°C), short-circuit protection, input current limit (7.8A), reverse current limit (–1.0A), and UVLO (1.6V) |
Applications
| Wireless Modems | Backup Power Systems |
|---|---|
Use Scenario: Powering LTE/5G modem modules from variable sources including main rail, supercapacitor, or battery during brownouts. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 3.3V/3.8V rail despite input sag from 4.2V (Li-ion) down to 2.5V (backup cap). Use Value: Seamless mode transition prevents RF transmission dropouts; low-noise operation avoids baseband interference. | Use Scenario: Providing uninterrupted 3.3V supply to microcontroller and real-time clock during AC failure in industrial controllers. IC Role / Device Role / Timing Role: Bidirectional energy manager converting stored energy from backup supercapacitor (2.5–5.5V) to regulated system rail. Use Value: Input/output voltage overlap allows direct connection without diode OR-ing; <1μA shutdown current extends hold-up time. |
| Portable Inventory Terminals | Portable Instrumentation |
Use Scenario: Powering barcode scanner engine, display, and BLE radio from single-cell Li-ion (3.0–4.2V) while supporting 3.8V camera flash LED driver. IC Role / Device Role / Timing Role: Main system power IC delivering 3A peak for flash pulse while sustaining 500mA continuous for core logic. Use Value: High peak current capability eliminates need for separate flash boost; integrated current limits protect battery under fault. | Use Scenario: Supplying ultra-low-noise 3.3V/5.0V rails to ADCs, op-amps, and RF front-ends in handheld multimeters or spectrum analyzers. IC Role / Device Role / Timing Role: Precision power source with <10mVpp ripple in PWM mode and minimized conducted EMI for signal integrity. Use Value: Low-noise architecture avoids measurement floor degradation; 96% efficiency extends battery runtime without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Lower max output current (2.5A), fixed 2.5MHz frequency, no Burst Mode; uses different compensation scheme | Less suitable for 3A pulsed loads or ultra-low-quiescent battery standby; better for fixed-frequency EMI-sensitive apps | Choose TPS63020DSJR if footprint compatibility with 20-pin WSON is required and 2.5A peak suffices |
| MAX77827AEWE+T | Higher integration (I2C programmable, telemetry), but lower efficiency (92% typ), 2A max output, 2.2MHz fixed | Preferred for smart battery management with telemetry; unsuitable for 3A continuous or low-noise RF supply | Choose MAX77827AEWE+T when digital control and fuel-gauge interface outweigh raw power density needs |
Compared with TPS63020DSJR and MAX77827AEWE+T, the LTC3113IFE#PBF delivers higher continuous current (3A), true low-noise operation with selectable Burst Mode, and superior thermal performance in TSSOP-making it optimal for demanding portable instrumentation and wireless modems where analog integrity and peak power coexist.
Availability
LTC3113IFE#PBF is available at Aetrix Electronics and suitable for wireless modems, backup power systems, and portable instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LTC3113IFE#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 LTC3113IFE#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, engineered specifically for applications demanding wide input/output voltage overlap, low noise, and robust protection in space- and power-constrained portable electronics.
FAQ
What is the maximum continuous output current specification for the LTC3113IFE#PBF?
The LTC3113IFE#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 thermal and current-limit constraints. Burst Mode operation further reduces available output current based on input/output voltage ratio and efficiency.
Does the LTC3113IFE#PBF support output voltages both above and below the input voltage?
Yes, the LTC3113IFE#PBF supports regulated output voltages both above and below the input voltage using its four-switch synchronous buck-boost topology. It operates seamlessly across buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) modes without output disruption or control-loop instability, enabling single-rail solutions in variable-source applications.
What package type and thermal characteristics does the LTC3113IFE#PBF use?
The LTC3113IFE#PBF uses a 20-lead plastic TSSOP package with an exposed thermal pad (Pin 21) connected to PGND. Its thermal resistance is θJA = 31.5°C/W and θJC = 4.1°C/W. The exposed pad must be soldered to a PCB ground plane for effective heat dissipation; proper layout ensures reliable 3A operation up to 125°C junction temperature.
How is switching frequency programmed on the LTC3113IFE#PBF?
Switching frequency on the LTC3113IFE#PBF is programmed via 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 f ≈ 1.0MHz. Frequency range is 300kHz to 2MHz; values outside this range may cause unstable operation or violate absolute maximum ratings.
What protection features are integrated into the LTC3113IFE#PBF?
The LTC3113IFE#PBF integrates thermal shutdown (155°C activation, 145°C reset), input current limit (7.8A avg), peak switch current limit (11.1A), reverse current limit (–1.0A), short-circuit protection, undervoltage lockout (1.6V), and <1μA shutdown current with output disconnect. These features ensure robust operation in portable and industrial environments without external circuitry.
LTC3113IFE#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
LTC3113IFE#PBF FAQ
1.How can I place an order for LTC3113IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3113IFE#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 LTC3113IFE#PBF reliable?
The price and inventory of LTC3113IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3113IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3113IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3113IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3113IFE#PBF?
LTC3113IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3113IFE#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 LTC3113IFE#PBF?
For technical support, including LTC3113IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3113IFE#PBF requirements.
6.How does Aetrix verify that LTC3113IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3113IFE#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 LTC3113IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3113IFE#PBF?
All LTC3113IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3113IFE#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 LTC3113IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3113IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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