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Analog Devices Inc. LTC3111HDE#TRPBF
- Part No.:
- LTC3111HDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3111HDE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 14DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3111HDE#TRPBF from Analog Devices (formerly Linear Technology) is a high-temperature-rated, synchronous 4-switch buck-boost DC/DC converter with single-inductor architecture. It regulates output voltage from 2.5V to 15V across input voltages of 2.5V–15V, delivers up to 1.5A continuous output at 5V (VIN ≥ 5V, PWM mode), operates at 800kHz (synchronizable 600kHz–1.5MHz), and features <1µA shutdown current - ideal for battery-backed industrial power systems requiring seamless VIN-to-VOUT crossover.
For engineers reviewing the LTC3111HDE#TRPBF datasheet, LTC3111HDE#TRPBF pinout, LTC3111HDE#TRPBF application, or LTC3111HDE#TRPBF equivalent, key selection criteria include its extended junction temperature range (–40°C to 150°C), accurate RUN-pin UVLO programming (1.15V enable threshold), 49µA no-load quiescent current in Burst Mode®, and integrated short-circuit/thermal protection with output disconnect in shutdown.
Technical Context
The LTC3111HDE#TRPBF implements a proprietary 4-switch, single-inductor topology enabling continuous conduction-mode regulation when VIN < VOUT (boost), VIN > VOUT (buck), or VIN ≈ VOUT (buck-boost transition), eliminating output discontinuity. Its voltage-mode control loop uses an internal 0.8V reference and COMP pin-based Type III compensation for stable transient response across wide input/output ranges.
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 limit), reverse-current blocking (–1A limit), and thermally adaptive protection that linearly reduces current limit above ~170°C before full thermal shutdown at ~175°C.
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 - programmable via FB resistor divider; enables fixed 3.3V/5V or adjustable rails from same BOM. |
| Continuous Output Current | 1.5A at VOUT = 5V, VIN ≥ 5V, PWM mode - sufficient for RF transmitters, FPGA I/O, and industrial microcontrollers. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - allows EMI tuning and avoids sensitive frequency bands in dense PCB layouts. |
| Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on sensor nodes and low-power telemetry devices. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive, military enclosures, and high-ambient industrial environments. |
| Shutdown Current | <1µA - enables true zero-power state during system sleep or maintenance modes. |
Pinout & Package
Package: 14-lead (3mm × 4mm × 0.75mm) plastic DFN with exposed PGND pad (Pin 15), thermally enhanced for high-power density operation at 150°C junction rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Signal Ground Reference | Return path for RUN and FB dividers; must be isolated from PGND until star-point connection to avoid noise coupling into feedback loop. |
| PWM/SYNC (Pin 2) | Mode Control & Clock 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 gate drivers and logic; tracks VIN up to clamp voltage, accepts external 2.5V–5.5V source for improved efficiency. |
| NC (Pin 4) | No Connect | Internally unconnected; must be tied to GND per layout guidelines to minimize parasitic coupling. |
| VOUT (Pin 5) | Regulated Output Node | Delivers final regulated voltage; requires low-ESR ceramic capacitor (≥22µF) placed adjacent to pin with shortest possible ground return. |
| SW2 (Pin 6) | Inductor Switch Node (Boost Side) | Connects to one end of external inductor; drives internal switches C/D; high dv/dt node requiring tight layout and guard ring. |
| BST2 (Pin 7) | Floating Gate Drive Supply (D-Switch) | Requires 0.1µF ceramic capacitor to SW2; supplies boosted voltage for high-side D-switch driver in boost/buck-boost modes. |
| COMP (Pin 8) | Error Amplifier Output | Drives external Type III compensation network (RFF/CFF/CFB); sets loop stability and transient response; sensitive to noise. |
| FB (Pin 9) | Feedback Input | Monitors VOUT via resistor divider; 0.8V internal reference enables precise output programming; leakage <50nA preserves accuracy. |
| SNSGND (Pin 10) | Sense Ground Return | Dedicated ground for current-sensing paths; must connect directly to PGND near exposed pad to minimize offset errors. |
| RUN (Pin 11) | Enable & UVLO Programming | Resistive divider from VIN sets turn-on (1.15V typ.) and turn-off (1.03V typ.) thresholds with 120mV hysteresis for clean power sequencing. |
| VIN (Pin 12) | Main Input Supply | Accepts 2.5V–15V; requires ≥10µF low-ESR/low-ESL ceramic capacitor placed within 2mm for stable high-frequency operation. |
| SW1 (Pin 13) | Inductor Switch Node (Buck Side) | Connects to opposite end of external inductor; drives internal switches A/B; shares layout constraints with SW2 for balanced switching. |
| BST1 (Pin 14) | Floating Gate Drive Supply (A-Switch) | Requires 0.1µF ceramic capacitor to SW1; supplies boosted voltage for high-side A-switch driver in buck/buck-boost modes. |
| PGND (Exposed Pad) | Power Ground Plane | Primary thermal and current return path; must be soldered with ≥90% coverage and connected to solid ground plane via ≥6 thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | 4-switch architecture maintains continuous inductor current during VIN-to-VOUT crossover, eliminating output glitches in dynamic supply environments. |
| Programmable UVLO with Hysteresis | RUN pin enables custom input undervoltage lockout (1.15V enable / 1.03V disable) with 120mV hysteresis - critical for brownout resilience in battery-fed systems. |
| Thermal Derating Protection | Linear current limit reduction above 170°C and full shutdown at 175°C prevent thermal runaway while preserving reliability in sealed enclosures. |
| Inductor Damping in Sleep | 1kΩ active damping between SW1/SW2 and GND during Burst Mode® or shutdown suppresses ringing and EMI without external components. |
| Reverse Current Blocking | Active monitoring of VOUT current limits reverse flow to –1A, protecting upstream sources when output is externally overdriven (e.g., hot-swap scenarios). |
Applications
| Industrial Backup Power | RF Transmitter Supply |
|---|---|
|
Use Scenario: Maintaining 5V rail during main power failure using supercapacitor or secondary battery bank in PLC controllers or remote I/O modules. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated 5V output from decaying 2.7–12V backup source with seamless mode transition. Use Value: Eliminates need for separate buck and boost converters; 1.5A output sustains Ethernet PHY, CAN transceivers, and real-time clocks during extended outages. |
Use Scenario: Powering 5V RF power amplifier stages in portable radios or IoT gateways where input varies from 3.3V (LiPo depleted) to 12V (external adapter). IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC stage providing stable 5V to PA bias circuitry with minimal ripple-induced phase noise. Use Value: 95% peak efficiency and 800kHz fixed-frequency operation reduce conducted EMI; Burst Mode® extends battery runtime during standby. |
| Military Vehicle Electronics | Multi-Chemistry Battery Systems |
|
Use Scenario: Regulating 3.3V or 5V for mission-critical avionics sensors in armored vehicles where input swings from 18V cold-crank to 28V alternator surge. IC Role / Device Role / Timing Role: Wide-input buck-boost converter operating across –40°C to +150°C ambient with robust thermal management. Use Value: H-grade qualification ensures functionality at extreme temperatures; 150°C max junction rating prevents derating in confined chassis spaces. |
Use Scenario: Single power solution for handheld test equipment supporting 1–3 cell Li-ion, NiMH, or alkaline batteries (2.5–12.6V input range). IC Role / Device Role / Timing Role: Adaptive regulator maintaining constant 3.3V/5V output regardless of battery chemistry, state-of-charge, or load profile. Use Value: Input range covers full discharge curves of all common chemistries; 49µA Burst Mode® quiescent current maximizes shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115IDHD#TRPBF | Higher 36V input rating, 2A output, 4mm × 5mm DFN; lacks programmable RUN UVLO and has higher 120µA Burst Mode® IQ. | Better suited for 24V industrial buses or PoE-powered devices; less optimal for space-constrained battery packs. | Select when input exceeds 15V or >1.5A output is required; verify layout compatibility with larger package and different pinout. |
| MAX20406AATG+T | 3.5V–36V input, 2.5A output, 2.2MHz switching; integrated FETs but only supports VIN > VOUT or VIN < VOUT-not true buck-boost crossover. | Requires external buck-boost IC for VIN ≈ VOUT operation; optimized for high-frequency, low-profile designs rather than wide-temp reliability. | Choose for compact 24V systems needing >1.5A; avoid where seamless VIN/VOUT crossover (e.g., battery backup) is mandatory. |
Compared with LTC3115IDHD#TRPBF and MAX20406AATG+T, the LTC3111HDE#TRPBF uniquely combines true buck-boost crossover capability, ultra-low 49µA Burst Mode® current, and guaranteed 150°C operation - making it the preferred choice for thermally demanding, battery-backed applications requiring uninterrupted regulation across variable input conditions.
Availability
LTC3111HDE#TRPBF is available at Aetrix Electronics and suitable for industrial backup power, RF transmitter supply, military vehicle electronics, and multi-chemistry battery systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3111HDE#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 analog and power management ICs with rigorous qualification standards and long-term product support.
The LTC3111HDE#TRPBF belongs to Linear's high-reliability buck-boost regulator family, designed specifically for applications demanding seamless VIN-to-VOUT regulation, extended temperature operation, and robust protection in harsh environments.
FAQ
What is the maximum junction temperature rating for the LTC3111HDE#TRPBF?
The LTC3111HDE#TRPBF is rated for a maximum junction temperature of 150°C, with guaranteed performance across –40°C to +150°C operating junction range. This H-grade qualification makes it suitable for under-hood automotive, military, and high-ambient industrial applications where standard E- or I-grade parts would require derating.
Does the LTC3111HDE#TRPBF support true buck-boost crossover operation?
Yes, the LTC3111HDE#TRPBF uses a proprietary 4-switch, single-inductor architecture that enables continuous regulation when VIN is above, below, or equal to VOUT - with no discontinuity in inductor current or output voltage. This eliminates the need for separate buck and boost converters in battery backup or multi-rail systems.
How is the RUN pin used to program undervoltage lockout on the LTC3111HDE#TRPBF?
The RUN pin on the LTC3111HDE#TRPBF accepts a resistive divider from VIN to set custom turn-on (1.15V typical) and turn-off (1.03V typical) thresholds with 120mV hysteresis. The formula VIN(RUN) = 1.2V × (1 + R5/R6) allows precise UVLO configuration for battery voltage monitoring or system-level power sequencing.
What is the quiescent current of the LTC3111HDE#TRPBF in Burst Mode® operation?
The LTC3111HDE#TRPBF draws 49µA typical quiescent current in Burst Mode® operation (measured at FB = 1V, PWM/SYNC = 0V), enabling extended battery life in always-on sensor nodes, telemetry devices, and low-power IoT endpoints without sacrificing startup speed or regulation accuracy.
Can the LTC3111HDE#TRPBF be synchronized to an external clock?
Yes, the LTC3111HDE#TRPBF supports external synchronization via its PWM/SYNC pin. Applying a square wave between 600kHz and 1.5MHz (with ≥100ns minimum high/low time) overrides the internal 800kHz oscillator, allowing EMI reduction through frequency dithering or alignment with system timing domains.
LTC3111HDE#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:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x3)
LTC3111HDE#TRPBF FAQ
1.How can I place an order for LTC3111HDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111HDE#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 LTC3111HDE#TRPBF reliable?
The price and inventory of LTC3111HDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111HDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3111HDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111HDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111HDE#TRPBF?
LTC3111HDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111HDE#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 LTC3111HDE#TRPBF?
For technical support, including LTC3111HDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111HDE#TRPBF requirements.
6.How does Aetrix verify that LTC3111HDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3111HDE#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 LTC3111HDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3111HDE#TRPBF?
All LTC3111HDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111HDE#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 LTC3111HDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3111HDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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