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Analog Devices Inc. LTC3111MPDE#TRPBF
- Part No.:
- LTC3111MPDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3111MPDE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,287
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Product details
Overview
LTC3111MPDE#TRPBF from Analog Devices (formerly Linear Technology) is a high-reliability, synchronous 4-switch buck-boost DC/DC converter with extended 2.5V–15V input/output range, 1.5A continuous output current at 5V, 800kHz fixed-frequency PWM operation, and –55°C to +150°C operating junction temperature. It enables regulated power delivery where VIN may be above, below, or equal to VOUT - ideal for military-grade battery-backed systems, RF transmitters, and industrial backup power rails.
For engineers reviewing the LTC3111MPDE#TRPBF datasheet, LTC3111MPDE#TRPBF pinout, LTC3111MPDE#TRPBF application, or LTC3111MPDE#TRPBF equivalent, key selection criteria include its wide VIN/VOUT overlap capability, programmable RUN threshold for custom UVLO, 49µA no-load quiescent current in Burst Mode®, and thermal robustness across extreme ambient conditions.
Technical Context
The LTC3111MPDE#TRPBF implements a proprietary 4-switch, single-inductor architecture that enables seamless mode transitions (buck → buck-boost → boost) without inductor current discontinuity or output voltage glitch. 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 low-RDS(ON) N-channel MOSFETs (90mΩ for SW1, 105mΩ for SW2/BST switches), dual current limiting (2.3A input limit, 5.8A peak), reverse current protection (–1A), and thermally adaptive current derating above ~170°C. The RUN pin provides precise enable/disable thresholds (1.15V rising, 1.08V falling) with 120mV hysteresis, while PWM/SYNC supports synchronization from 600kHz to 1.5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 2.5V to 15V - supports single/multi-cell Li-ion, alkaline/NiMH, supercapacitor, or wall adapter sources without external level-shifting. |
| Continuous Output Current | 1.5A at VOUT = 5V, VIN ≥ 5V, PWM mode - sufficient for powering RF PA stages or FPGA I/O rails. |
| Switching Frequency | 800kHz nominal (600–1500kHz syncable) - balances EMI suppression, inductor size, and efficiency in compact layouts. |
| Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on sensor nodes or low-duty-cycle telemetry devices. |
| Operating Temperature | –55°C to +150°C junction - qualified for MIL-PRF-38535 Class H and space-grade thermal cycling environments. |
| Shutdown Current | <1µA - enables true zero-power standby in safety-critical shutdown states. |
| Feedback Reference | 0.80V ±2% - allows precise output programming via resistor divider; stable over full temperature range. |
Pinout & Package
Package: 14-lead (3mm × 4mm × 0.75mm) plastic DFN with exposed PGND pad (Pin 15), rated for –55°C to +150°C operation. Thermal resistance θJA = 43°C/W; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Signal Ground Reference | Return path for FB and RUN dividers; isolated from PGND to minimize noise coupling into feedback loop. |
| PWM/SYNC (Pin 2) | Mode Control & Sync Input | DC voltage <0.5V forces Burst Mode; >1.5V enables 800kHz PWM; 600–1500kHz square wave overrides internal oscillator. |
| VCC (Pin 3) | Internal Bias Supply | Regulated ~4.2V supply for gate drivers and logic; tracks VIN up to clamp, accepts external 2.5–5.5V source. |
| NC (Pin 4) | No Connect | Internally unconnected; must be tied to SGND per layout guidelines to prevent floating node EMI. |
| VOUT (Pin 5) | Regulated Output | Delivers up to 1.5A; requires local 22µF low-ESR ceramic capacitor with short ground return path. |
| SW2 (Pin 6) | Boost-Side Switch Node | Connects to inductor and internal switches C/D; requires 0.1µF BST2 capacitor to SW2 for gate drive. |
| BST2 (Pin 7) | Boost Driver Supply for SW2 | Floating supply for high-side D-switch driver; capacitor to SW2 provides charge pump voltage. |
| COMP (Pin 8) | Error Amplifier Output | Drives external Type III compensation network (RFF, CFF, CFB) to stabilize control loop across all modes. |
| FB (Pin 9) | Feedback Input | Monitors VOUT via resistor divider; 0.8V reference sets output: VOUT = 0.8V × (1 + R1/R2). |
| SNSGND (Pin 10) | Sense Ground | Dedicated analog ground for current sensing paths; must connect directly to PGND at single point. |
| RUN (Pin 11) | Enable & UVLO Programming | Resistive divider from VIN sets turn-on (1.15V) and turn-off (1.08V) thresholds; hysteresis prevents chatter. |
| VIN (Pin 12) | Main Input Supply | Accepts 2.5–15V; requires ≥10µF low-ESR/low-ESL ceramic bypass close to pin with minimal loop area. |
| SW1 (Pin 13) | Buck-Side Switch Node | Connects to inductor and internal switches A/B; requires 0.1µF BST1 capacitor to SW1 for gate drive. |
| BST1 (Pin 14) | Boost Driver Supply for SW1 | Floating supply for high-side A-switch driver; capacitor to SW1 enables efficient high-side conduction. |
| PGND (Pin 15) | Power Ground | Exposed thermal pad; must be soldered to large PCB ground plane with multiple vias for thermal dissipation and low-impedance return. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Single-Inductor Architecture | Enables seamless buck/boost/buck-boost transitions without output dropout or inductor current reversal - critical for uninterrupted power in avionics or medical telemetry. |
| Programmable RUN Threshold | Allows precise system-level undervoltage lockout (UVLO) with 120mV hysteresis - eliminates need for external supervisor IC in battery-fail-safe designs. |
| Output Disconnect in Shutdown | Prevents backfeed from VOUT to VIN during disable - protects upstream batteries or capacitors in redundant power architectures. |
| Thermal Derating & Shutdown | Linear current reduction above ~170°C and full disable at ~175°C - ensures safe operation under sustained overload or poor heatsinking. |
| Inductor Damping in Sleep | 1kΩ active damping between SW1/SW2 and GND during Burst Mode or shutdown - suppresses ringing and reduces EMI emissions by >10dB. |
Applications
| Military Backup Power | RF Transmitter Supply |
|---|---|
|
Use Scenario: Maintaining regulated 5V/3.3V rail during main power interruption in airborne communication systems using supercapacitor hold-up. IC Role / Device Role / Timing Role: Buck-boost regulator providing continuous output as capacitor voltage decays from 12V to 2.7V. Use Value: Eliminates need for separate buck and boost converters; –55°C to +150°C rating ensures reliability across flight envelope. |
Use Scenario: Powering GaN RF power amplifier stages requiring stable 5V bias under varying battery input (3.0–4.2V) and pulsed load demands. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter delivering 1.5A with fast transient response to PA modulation envelopes. Use Value: 800kHz switching minimizes output filter size; Burst Mode extends battery runtime during receive-only intervals. |
| Industrial Sensor Node | Multi-Cell Battery System |
|
Use Scenario: Enabling ultra-low-power wireless sensor nodes powered by two alkaline cells (2.0–3.2V) while regulating 3.3V for MCU and radio. IC Role / Device Role / Timing Role: Wide-input buck-boost converter operating in Burst Mode to maintain µA-level system quiescent current. Use Value: 49µA no-load IQ extends shelf life; internal soft-start prevents inrush during cold-start from depleted batteries. |
Use Scenario: Providing stable 5V/12V output from 1–3 series Li-ion cells (3.0–12.6V) in portable test equipment with dynamic load profiles. IC Role / Device Role / Timing Role: Seamless mode-hopping converter maintaining regulation across full battery discharge curve without manual reconfiguration. Use Value: Single-inductor design reduces BOM count and board area; 1.5A output supports USB-C PD emulation and auxiliary loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#TRPBF | 2MHz sync capability, higher 6A output, but only –40°C to +125°C grade; larger MSOP-16 package. | Better for high-frequency, high-current automotive infotainment; lacks MP-grade extended temperature qualification. | Select when higher output current and faster switching are prioritized over extreme temperature operation. |
| TPS63020DSJR | Lower 2.5A max output, 2.5V–5.5V input, –40°C to +85°C; smaller 2mm × 2mm WSON package. | Suitable for consumer wearables or handhelds; not rated for military or aerospace thermal stress. | Choose for cost-sensitive, space-constrained commercial designs where extended temperature is unnecessary. |
Compared with LT8390AEMSE#TRPBF and TPS63020DSJR, the LTC3111MPDE#TRPBF uniquely delivers MIL-grade thermal resilience (–55°C to +150°C) combined with seamless wide-range buck-boost operation - making it irreplaceable in mission-critical platforms where environmental extremes and power continuity are non-negotiable.
Availability
LTC3111MPDE#TRPBF is available at Aetrix Electronics and suitable for military backup power, RF transmitter supply, and industrial sensor node applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3111MPDE#TRPBF 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 its legacy of high-performance power management ICs with rigorous military and aerospace qualification standards.
The LTC3111MPDE#TRPBF belongs to Linear's precision buck-boost regulator family, engineered specifically for applications demanding uninterrupted power delivery across wide input/output overlaps and extreme environmental conditions.
FAQ
What is the maximum continuous output current of the LTC3111MPDE#TRPBF?
The LTC3111MPDE#TRPBF delivers 1.5A continuous output current when VOUT = 5V and VIN ≥ 5V in PWM mode. At other output voltages or in Burst Mode®, current capability decreases due to thermal and switching constraints. The device includes 2.3A input current limit and 5.8A peak current protection to safeguard against overload.
Does the LTC3111MPDE#TRPBF support synchronization to an external clock?
Yes, the LTC3111MPDE#TRPBF supports external frequency synchronization via its PWM/SYNC pin. Applying a square wave signal between 600kHz and 1.5MHz overrides the internal 800kHz oscillator. The signal must maintain ≥100ns minimum high/low time to ensure reliable PLL lock, enabling EMI reduction through spread-spectrum or fixed-frequency coordination.
How does the RUN pin function on the LTC3111MPDE#TRPBF?
The RUN pin on the LTC3111MPDE#TRPBF serves dual functions: digital enable/disable control and programmable input UVLO. When driven above 1.15V (rising), it enables the converter; below 1.08V (falling), it disables it. A resistive divider from VIN sets custom turn-on/turn-off thresholds, providing system-level brownout protection without external supervisors.
What is the purpose of the BST1 and BST2 pins on the LTC3111MPDE#TRPBF?
BST1 and BST2 are bootstrap driver supplies for the high-side N-channel MOSFETs (switches A and D). Each requires a 0.1µF ceramic capacitor connected between the BST pin and its respective switch node (SW1 or SW2). This forms a charge pump that generates gate drive voltage above the switch node potential, enabling full enhancement of the high-side FETs in buck and boost phases.
Can the LTC3111MPDE#TRPBF operate with input voltage lower than output voltage?
Yes, the LTC3111MPDE#TRPBF is explicitly designed for buck-boost operation where VIN may be below, above, or equal to VOUT - supported across its full 2.5V–15V input and output range. Its 4-switch architecture ensures continuous conduction mode transitions without dropout, making it ideal for battery-powered systems where input voltage declines across discharge cycles.
LTC3111MPDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3111MPDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111MPDE#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3111MPDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111MPDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3111MPDE#TRPBF?
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4.How is shipping managed for LTC3111MPDE#TRPBF?
LTC3111MPDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111MPDE#TRPBF 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#TRPBF?
For technical support, including LTC3111MPDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111MPDE#TRPBF requirements.
6.How does Aetrix verify that LTC3111MPDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3111MPDE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3111MPDE#TRPBF?
All LTC3111MPDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111MPDE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3111MPDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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