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Analog Devices Inc. LTC3111MPDE#PBF
- Part No.:
- LTC3111MPDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3111MPDE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,406
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Product details
Overview
LTC3111MPDE#PBF from Analog Devices (formerly Linear Technology) is a high-reliability, synchronous 4-switch buck-boost DC/DC converter designed for wide-input industrial and military power systems. It delivers up to 1.5A continuous output current with input/output voltage range of 2.5V–15V, operates at 800kHz fixed frequency (synchronizable 600kHz–1.5MHz), achieves up to 95% efficiency in PWM mode, and features –55°C to +150°C operating junction temperature rating.
For engineers reviewing the LTC3111MPDE#PBF datasheet, LTC3111MPDE#PBF pinout, LTC3111MPDE#PBF application, or LTC3111MPDE#PBF equivalent, key selection considerations include its extended temperature grade, accurate RUN-pin UVLO programming, seamless buck-boost transition, low 49µA no-load quiescent current in Burst Mode®, and integrated short-circuit and thermal protection.
Technical Context
The LTC3111MPDE#PBF implements a proprietary 4-switch, single-inductor architecture enabling continuous conduction mode operation across buck, buck-boost, and boost topologies without discontinuity in inductor current. Its voltage-mode control loop uses an internal 0.8V reference and error amplifier with external Type III compensation on the COMP pin.
It integrates four N-channel MOSFETs (SW1/SW2/BST1/BST2) with typical RDS(ON) of 90mΩ (Switch A) and 105mΩ (Switches B/C/D), supports programmable input UVLO via RUN pin (1.15V rising threshold), and includes dual current limiting: 3A input average limit and 5.8A peak switch limit, plus reverse current protection (–1A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports single/multi-cell Li-ion, alkaline/NiMH, backup capacitors, and wall adapters without external pre-regulation. |
| Output Voltage Range | 2.5V to 15V - adjustable via FB resistor divider; enables regulated output even when VIN < VOUT, VIN > VOUT, or VIN ≈ VOUT. |
| Continuous Output Current | 1.5A at VIN ≥ 5V, VOUT = 5V, PWM mode - sufficient for RF transmitters, FPGA I/O rails, and sensor subsystems. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - allows EMI optimization and avoids sensitive frequency bands in dense PCB layouts. |
| Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on, low-duty-cycle applications such as remote telemetry nodes. |
| Operating Junction Temp | –55°C to +150°C - qualified for extreme-environment aerospace, downhole, and military vehicle electronics. |
| Shutdown Current | < 1µA - enables true zero-power standby in safety-critical shutdown states. |
Pinout & Package
Package: 14-lead (3mm × 4mm × 0.75mm) plastic DFN with exposed PGND pad (Pin 15), thermally enhanced for high-power density in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Signal Ground Reference | Return path for RUN and FB voltage dividers; must be isolated from noisy power ground to avoid regulation error. |
| PWM/SYNC (Pin 2) | Mode Control & Sync Input | DC voltage <0.5V forces Burst Mode®; >1.5V enables 800kHz PWM; 600kHz–1.5MHz square wave overrides internal oscillator. |
| VCC (Pin 3) | Internal Bias Supply | Regulated ~4.2V supply for control circuitry; tracks VIN up to clamp voltage; requires 1µF ceramic bypass to SGND. |
| NC (Pin 4) | No Connect | Internally unconnected; must be tied to SGND per layout guidelines to minimize noise coupling. |
| VOUT (Pin 5) | Regulated Output Node | Delivers final output voltage; requires low-ESR ceramic capacitor (e.g., 22µF) placed adjacent to pin with short SGND return. |
| SW2 (Pin 6) | Inductor Switch Node 2 | Connects to one end of external inductor and internal switches C/D; high dv/dt node requiring tight layout and guard ring. |
| BST2 (Pin 7) | Floating Gate Drive Supply | Boosted supply for D-switch driver; requires 0.1µF ceramic capacitor between BST2 and SW2 for proper high-side gate drive. |
| COMP (Pin 8) | Error Amplifier Output | Drives external Type III compensation network; stability and transient response depend on R-C values selected per application. |
| FB (Pin 9) | Feedback Voltage Input | Senses output via resistor divider; 0.8V internal reference sets VOUT = 0.8V × (1 + R1/R2); leakage <50nA ensures accuracy. |
| SNSGND (Pin 10) | Sense Ground Return | Dedicated ground for feedback and current sense paths; must connect directly to SGND plane with minimal trace length. |
| RUN (Pin 11) | Enable & UVLO Programming | Enables IC when voltage exceeds 1.15V (rising); provides accurate, hysteresis-based input undervoltage lockout (120mV). |
| VIN (Pin 12) | Main Input Supply | Primary power source; requires ≥10µF low-ESR/low-ESL ceramic capacitor placed within 2mm of pin with direct PGND return. |
| SW1 (Pin 13) | Inductor Switch Node 1 | Connects to other end of external inductor and internal switches A/B; shares same high-frequency switching stress as SW2. |
| BST1 (Pin 14) | Floating Gate Drive Supply | Boosted supply for A-switch driver; requires 0.1µF ceramic capacitor between BST1 and SW1 for reliable high-side turn-on. |
| PGND (Exposed Pad) | Power Ground Plane | Thermal and electrical ground for all power switches; must be soldered to large copper area with ≥6 thermal vias to inner ground planes. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | Proprietary 4-switch topology maintains continuous inductor current during mode shifts - eliminates output glitches in dynamic VIN/VOUT conditions. |
| Programmable RUN-Pin UVLO | Accurate 1.15V enable threshold with 120mV hysteresis - enables custom brown-in/brown-out behavior without external comparators. |
| Low-Noise Fixed-Frequency PWM | 800kHz operation with optional synchronization - reduces EMI peaks and simplifies filtering in noise-sensitive RF or precision analog systems. |
| Integrated Protection Suite | Includes input current limit (3A), peak switch limit (5.8A), reverse current limit (–1A), thermal shutdown (~175°C), and internal soft-start (2ms). |
| Ultra-Low Quiescent Current | 49µA in Burst Mode® - sustains multi-year battery life in wireless sensors and IoT edge devices with infrequent wake cycles. |
Applications
| RF Transmitter Power Supply | Military Vehicle Power Management |
|---|---|
|
Use Scenario: Providing stable 5V/1.5A bias to GaN PA stages in SDR radios operating from 12V vehicle battery with cold-crank dips to 4V. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining constant output despite VIN sagging below VOUT during engine cranking. Use Value: Eliminates need for separate boost stage; –55°C to +150°C rating ensures operation in unheated avionics bays and desert-deployed comms units. |
Use Scenario: Generating 3.3V and 5V rails for mission-critical navigation computers powered by 24V/28V MIL-STD-1275B supplies with severe transients. IC Role / Device Role / Timing Role: Primary DC/DC converter handling wide input range (16V–40V) while delivering regulated outputs with fast load-step response. Use Value: Internal soft-start and robust current limiting prevent system reset during high-current motor actuator activation. |
| Downhole Sensor Module | Industrial Backup Power System |
|
Use Scenario: Powering MEMS accelerometers and telemetry ICs in oil/gas drilling tools exposed to >150°C ambient wellbore temperatures. IC Role / Device Role / Timing Role: High-temperature DC/DC converter accepting 15V supercapacitor backup and regulating to 3.3V logic rail. Use Value: MP-grade qualification guarantees full functionality at 150°C junction temperature; low 1µA shutdown current preserves energy during dormant phases. |
Use Scenario: Maintaining 5V output for PLC I/O modules during AC mains failure using 12V backup battery or supercapacitor bank. IC Role / Device Role / Timing Role: Seamless buck-boost regulator that sustains output as battery discharges from 12V down to 2.7V without interruption. Use Value: Output disconnect in shutdown prevents battery drain; 95% efficiency minimizes heat buildup in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EFE#PBF | Higher 3.5A output current, wider 2.5V–40V input range, but only rated to –40°C to +125°C. | Preferred for high-current industrial HMIs or solar-powered gateways needing extended VIN range. | Select when output current >1.5A is required and extended temperature is not mandatory. |
| MAX20406AATG+T | 3.5A output, 2.5V–16V input, integrated FETs, but lacks programmable RUN-pin UVLO and has 125°C max junction rating. | Suitable for cost-sensitive automotive body electronics where MIL-spec temp range is unnecessary. | Choose for higher integration and lower BOM count where –55°C operation is not required. |
Compared with LTC3115EFE#PBF and MAX20406AATG+T, the LTC3111MPDE#PBF uniquely combines military-grade temperature range (–55°C to +150°C), precise RUN-pin programmability, and seamless buck-boost operation in a compact DFN package-making it irreplaceable for space-constrained, extreme-environment deployments where reliability under thermal stress is non-negotiable.
Availability
LTC3111MPDE#PBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, military vehicle electronics, downhole instrumentation, and industrial backup power systems requiring stable component supply across extended temperature extremes.
Supply support for LTC3111MPDE#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 continues to manufacture and support its high-performance power management portfolio with rigorous military and aerospace qualification standards.
The LTC3111 belongs to Linear's extended-range buck-boost converter family, engineered specifically for applications demanding seamless voltage regulation across wide input/output ranges and operation in extreme thermal environments.
FAQ
What is the maximum junction temperature rating for the LTC3111MPDE#PBF?
The LTC3111MPDE#PBF is fully tested and guaranteed over a junction temperature range of –55°C to +150°C. This MP-grade qualification includes burn-in, temperature cycling, and parametric testing at both extremes, making it suitable for downhole, aerospace, and military applications where standard commercial or industrial grades would fail.
Does the LTC3111MPDE#PBF support output voltages below 2.5V?
No, the LTC3111MPDE#PBF does not support output voltages below 2.5V. Its internal feedback reference is 0.8V and the datasheet-specified output adjust range is strictly 2.5V to 15V. Attempting to set VOUT lower than 2.5V violates the device's operational specification and may result in regulation inaccuracy or instability.
Can the LTC3111MPDE#PBF operate with an input voltage lower than its VOUT setting?
Yes, the LTC3111MPDE#PBF is explicitly designed for this condition. Its 4-switch buck-boost architecture enables continuous regulation even when VIN is below VOUT (boost mode), above VOUT (buck mode), or equal to VOUT (buck-boost transition). This capability is confirmed in the Typical Application schematic and efficiency curves across VIN = 2.7V, 5V, and 12V.
How is the RUN pin used to program undervoltage lockout on the LTC3111MPDE#PBF?
The RUN pin on the LTC3111MPDE#PBF accepts a resistive divider from VIN to set precise turn-on (1.15V rising) and turn-off (1.03V falling) thresholds. The formula VIN(RUN) = 1.2V × (1 + R5/R6) allows designers to configure custom UVLO behavior - for example, enabling at 6.5V and disabling at 5.8V - without external comparators or hysteresis circuits.
What is the purpose of the BST1 and BST2 pins on the LTC3111MPDE#PBF?
BST1 and BST2 are floating gate-drive supplies for the high-side N-channel MOSFETs (Switch A and Switch D). Each requires a dedicated 0.1µF ceramic capacitor connected between the BST pin and its respective switch node (SW1 or SW2) to generate the boosted voltage needed to fully enhance the high-side FETs - ensuring low RDS(ON) and high efficiency across the full operating range.
LTC3111MPDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-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):
- 2.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 800kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x3)
LTC3111MPDE#PBF FAQ
1.How can I place an order for LTC3111MPDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111MPDE#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 LTC3111MPDE#PBF reliable?
The price and inventory of LTC3111MPDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111MPDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3111MPDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111MPDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111MPDE#PBF?
LTC3111MPDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111MPDE#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 LTC3111MPDE#PBF?
For technical support, including LTC3111MPDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111MPDE#PBF requirements.
6.How does Aetrix verify that LTC3111MPDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3111MPDE#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 LTC3111MPDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3111MPDE#PBF?
All LTC3111MPDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111MPDE#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 LTC3111MPDE#PBF part is unused and in its original packaging.
Return procedure for LTC3111MPDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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