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Analog Devices Inc. LTC3112HDHD#PBF
- Part No.:
- LTC3112HDHD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3112HDHD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2.5A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:145
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Product details
Overview
LTC3112HDHD#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, synchronous 4-switch buck-boost DC/DC converter with seamless VIN-to-VOUT regulation across input voltages from 2.7V to 15V and output voltages from 2.5V to 14V. It delivers up to 2.5A continuous output current at 5VOUT in PWM mode, features integrated 40–60mΩ N-channel MOSFETs, and operates at a fixed 750kHz switching frequency (synchronizable from 300kHz to 1.5MHz). It is used in battery-powered RF transmitters requiring stable 5V/2.5A rail from variable-input sources such as Li-ion stacks or backup capacitors.
For engineers reviewing the LTC3112HDHD#PBF datasheet, LTC3112HDHD#PBF pinout, LTC3112HDHD#PBF application, or LTC3112HDHD#PBF equivalent, key selection considerations include its –40°C to 150°C guaranteed junction temperature range, output current monitoring via IOUT pin (24µA/A), and dual-mode operation (PWM/Burst Mode with 50µA IQ).
Technical Context
The LTC3112HDHD#PBF implements a proprietary 4-switch, single-inductor architecture enabling continuous conduction mode operation regardless of whether VIN is above, below, or equal to VOUT - eliminating mode transitions and associated output ripple or discontinuity. Its voltage-mode control loop uses an error amplifier (COMP) with external R-C compensation and a 0.8V reference for FB-based output regulation.
It integrates dual boosted gate drivers (BST1/BST2) supporting high-side N-MOSFETs, internal soft-start (2ms), overvoltage protection (OVP threshold = 0.83V), and thermal shutdown with automatic recovery at ~160°C. Current limiting includes average ILIMIT (6A typ), peak IPEAK (10A typ), and reverse current protection (–1A typ) on SW2/VOUT path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 15V - supports single/multi-cell Li-ion, backup capacitor, or wall adapter inputs without pre-regulation. |
| Output Voltage Range | 2.5V to 14V - adjustable via FB resistor divider; enables 3.3V, 5V, or 12V rails from same IC. |
| Continuous Output Current | 2.5A at VIN ≥ 5V, VOUT = 5V, PWM mode - sufficient for RF power amplifiers or industrial sensors. |
| Switching Frequency | 750kHz fixed (300–1500kHz synchronizable) - balances efficiency, size, and EMI in compact layouts. |
| Efficiency | Up to 95% - achieved using low-RDS(ON) internal MOSFETs (40–60mΩ) and synchronous rectification. |
| Quiescent Current | 50µA in Burst Mode, <1µA in shutdown - extends battery life in always-on portable systems. |
| Junction Temp Range | –40°C to +150°C - qualified for harsh environments including automotive under-hood or industrial motor controls. |
Pinout & Package
Package: 16-lead (5mm × 4mm × 0.75mm) plastic DFN with exposed thermal pad (Pin 17 = GND, must be soldered to PCB ground plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 17) | Power & signal ground reference | Exposed pad (Pin 17) is primary thermal path; requires low-impedance PCB connection to ground plane for thermal management. |
| VIN (Pins 4, 5) | Main input supply input | Bypassed with ≥10µF low-ESR ceramic capacitor; supports wide input range (2.7–15V) without external LDO. |
| VOUT (Pin 8) | Regulated output voltage node | Requires ≥47µF low-ESR ceramic output capacitor; delivers up to 2.5A with tight regulation (±1.5% FB accuracy). |
| SW1 (Pins 12, 13) | Switch node A/B connection | Connects to one end of external inductor; drives buck path; BST1 capacitor (0.1µF) required between BST1–SW1. |
| SW2 (Pins 9, 10) | Switch node C/D connection | Connects to other end of external inductor; drives boost path; BST2 capacitor (0.1µF) required between BST2–SW2. |
| IOUT (Pin 7) | Current monitor output | Sources 24µA per ampere of SW2-to-VOUT output current; enables analog current sensing or closed-loop current limiting. |
| RUN (Pin 6) | Enable/shutdown control | Logic-high (>0.75V) enables operation; logic-low (<0.35V) disables converter and reduces IQ to <1µA. |
| PWM/SYNC (Pin 16) | Mode selection & frequency sync | <0.5V = Burst Mode; >1.5V = fixed-frequency PWM; 300–1500kHz square wave overrides internal oscillator. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch buck-boost topology | Enables seamless VIN-to-VOUT regulation without mode switching artifacts - critical for noise-sensitive RF loads. |
| Integrated MOSFETs (40–60mΩ) | Eliminates external power switches; reduces BOM count and layout complexity while maintaining >95% peak efficiency. |
| Output current monitor (IOUT) | 24µA/A proportional current source enables real-time load monitoring or programmable current limiting without sense resistor. |
| Thermal shutdown with hysteresis | Disables all switches at ~170°C; auto-restarts at ~160°C - protects against sustained overload in sealed enclosures. |
| Inductor damping in sleep | 250Ω active pull-down on SW1/SW2 during Burst Mode or shutdown suppresses ringing and reduces EMI emissions. |
Applications
| Handheld RF Transmitter | Multi-Source Industrial Power System |
|---|---|
|
Use Scenario: Portable UHF RFID reader powered by 2-cell Li-ion (6–8.4V) requiring stable 5V/2.5A for RF PA and baseband ICs. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated 5V rail; maintains output during battery discharge from 8.4V → 6.0V. Use Value: Eliminates need for separate buck + boost converters; reduces solution size by 40% and improves system efficiency by 8% vs. cascaded topology. |
Use Scenario: Factory automation controller accepting 12V lead-acid, 5V USB, or 3.3V PoE inputs, requiring consistent 5V/2A for MCU and peripherals. IC Role / Device Role / Timing Role: Input-aggregating DC/DC stage that accepts variable input sources and outputs stable 5V regardless of source voltage. Use Value: Enables single-board design across multiple power domains; avoids manual jumper selection or redundant regulators. |
| LED Lighting with Dimming Control | Backup Capacitor Power Supply |
|
Use Scenario: Smart streetlight driver using 12V nominal input with PWM dimming; requires constant-current LED string supply with 10:1 dimming ratio. IC Role / Device Role / Timing Role: Pre-regulator generating stable 12V intermediate bus from varying solar/battery input; feeds downstream LED current controller. Use Value: Maintains full LED brightness down to 2.7V input - extends runtime during brownout or low-battery conditions. |
Use Scenario: Industrial PLC retaining SRAM and real-time clock during AC mains failure using supercapacitor bank (1.8–5.5V). IC Role / Device Role / Timing Role: Bidirectional-capable buck-boost managing energy transfer from supercap to 3.3V system rail during outage. Use Value: Supports >10-second hold-up time with 10F/2.7V capacitor; eliminates need for external diode OR-ing or discrete charge management. |
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#PBF | Higher 36V max input, lower 1.5A output current, 400kHz fixed frequency, no IOUT pin. | Better suited for 24V industrial input rails; lacks current monitoring for closed-loop load control. | Select when input exceeds 15V or thermal budget allows larger inductor; avoid if IOUT-based current limiting is required. |
| TPS63020DSJR | Lower 5.5V max input, 3A output, 2.5MHz switching, no OVP or thermal shutdown, smaller 2mm × 2mm QFN. | Optimized for space-constrained consumer wearables; not rated for >85°C ambient or industrial reliability. | Choose for cost-sensitive, low-power portable designs where extended temp range and protection features are non-critical. |
Compared with LTC3112HDHD#PBF, LTC3115EDHD#PBF trades output current and monitoring capability for higher input voltage tolerance, while TPS63020DSJR sacrifices ruggedness and protection for ultra-small footprint and higher switching frequency - making LTC3112HDHD#PBF the only option meeting full industrial temperature, current, and feature requirements simultaneously.
Availability
LTC3112HDHD#PBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive telematics modules, and medical handheld devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3112HDHD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3112 product line was designed specifically for high-reliability, wide-input-range DC/DC conversion in mission-critical systems where seamless buck-boost operation, robust protection, and extended temperature performance are mandatory.
FAQ
What is the maximum junction temperature rating for the LTC3112HDHD#PBF?
The LTC3112HDHD#PBF is guaranteed to operate over a junction temperature range of –40°C to +150°C. This high-temperature qualification enables use in under-hood automotive, industrial motor control, and enclosed power supply applications where ambient temperatures exceed 105°C. The device enters thermal shutdown at ~170°C and automatically recovers at ~160°C.
Does the LTC3112HDHD#PBF support output current limiting using the IOUT pin?
Yes, the LTC3112HDHD#PBF provides a 24µA-per-ampere current source on the IOUT pin, allowing direct implementation of output current limiting by feeding IOUT into the COMP node or FB divider. This enables precise, resistor-free current regulation - a key differentiator versus alternatives lacking integrated current monitoring.
Can the LTC3112HDHD#PBF regulate output voltage when input voltage equals output voltage?
Yes, the LTC3112HDHD#PBF's 4-switch architecture enables true buck-boost operation with continuous conduction mode even when VIN = VOUT. Unlike 2-switch or SEPIC topologies, it avoids discontinuous transitions or efficiency dips at unity gain - critical for stable powering of FPGAs or processors during battery mid-discharge.
What package type and thermal characteristics does the LTC3112HDHD#PBF use?
The LTC3112HDHD#PBF uses a 16-lead 5mm × 4mm DFN package with exposed thermal pad (Pin 17 = GND). Its thermal resistance is θJA = 43°C/W and θJC = 4°C/W. Effective thermal design requires soldering the exposed pad to a large PCB ground plane with multiple thermal vias to sustain full 2.5A output at elevated ambient temperatures.
How does Burst Mode operation affect efficiency and output ripple on the LTC3112HDHD#PBF?
In Burst Mode, the LTC3112HDHD#PBF reduces quiescent current to 50µA but increases output voltage ripple due to pulsed switching. Efficiency improves dramatically at light loads (<100mA), reaching >85% at 1mA, whereas PWM mode maintains tighter regulation and lower ripple at the cost of higher IQ. Selection depends on load profile: Burst Mode for battery longevity, PWM for noise-sensitive analog circuits.
LTC3112HDHD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LTC3112HDHD#PBF FAQ
1.How can I place an order for LTC3112HDHD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112HDHD#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 LTC3112HDHD#PBF reliable?
The price and inventory of LTC3112HDHD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112HDHD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3112HDHD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112HDHD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112HDHD#PBF?
LTC3112HDHD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112HDHD#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 LTC3112HDHD#PBF?
For technical support, including LTC3112HDHD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112HDHD#PBF requirements.
6.How does Aetrix verify that LTC3112HDHD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3112HDHD#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 LTC3112HDHD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3112HDHD#PBF?
All LTC3112HDHD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112HDHD#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 LTC3112HDHD#PBF part is unused and in its original packaging.
Return procedure for LTC3112HDHD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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