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Analog Devices Inc. LTC7149EUFD#TRPBF
- Part No.:
- LTC7149EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7149EUFD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:302
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Product details
Overview
LTC7149EUFD#TRPBF from Analog Devices is a 60V, 4A synchronous monolithic step-down regulator configured for inverting output applications, delivering –28V to 0V output with ±0.8% voltage accuracy, 92% efficiency at 12VIN/–5VOUT, and peak current mode control. It integrates 110mΩ top/50mΩ bottom N-channel MOSFETs and supports industrial telecom power supplies requiring negative rail generation from wide-input sources.
For engineers reviewing the LTC7149EUFD#TRPBF datasheet, LTC7149EUFD#TRPBF pinout, LTC7149EUFD#TRPBF application, or LTC7149EUFD#TRPBF equivalent, key selection criteria include its single-resistor VOUT programming, board-ground-referenced I/O (RUN, PGOOD, MODE/SYNC), programmable 300kHz–3MHz switching frequency, Burst Mode™ vs forced continuous mode trade-off, and thermal performance in the 4mm × 5mm QFN package with exposed SVOUT– pad.
Technical Context
The LTC7149EUFD#TRPBF employs peak current mode architecture with inherent cycle-by-cycle current limiting and fast transient response. Its error amplifier compares VOUTSNS (typically tied to GND) against the ISET pin's 50µA reference to regulate output voltage via VOUT– = –50µA × RSET.
It features dual LDOs (VIN- and EXTVCC-powered) regulating INTVCC to 3.3V or 3.1V above VOUT–, level-shifted I/O pins referenced to board GND, and internal BOOST capacitor refresh logic that forces bottom-FET conduction every ~8 cycles to sustain gate drive during high-duty operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 60V - supports wide-input industrial and telecom rails without external pre-regulation |
| Output Voltage Range | –28V to 0V - enables direct generation of negative supply rails for op-amps, ADCs, and RF biasing |
| Max Output Current | 4A inductor current - sufficient for mid-power analog and signal chain subsystems |
| Switching Frequency | 300kHz to 3MHz (±50% sync range) - allows EMI optimization and compact magnetics selection |
| Output Voltage Accuracy | ±0.8% - ensures stable reference compliance for precision analog circuitry |
| Quiescent Current | 440µA (Burst Mode), 15µA (shutdown) - extends battery life in always-on monitoring systems |
| Package | 28-Lead 4mm × 5mm QFN with exposed SVOUT– pad - provides low θJA = 43°C/W for thermally constrained PCBs |
Pinout & Package
28-Lead (4mm × 5mm) Plastic QFN with exposed pad (Pin 29) electrically and thermally connected to SVOUT–. Must be soldered to PCB copper plane for rated thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT– (Pins 1,2,26–28) | Negative output terminal | Primary return path for load current; ties directly to output capacitor negative and system ground reference for negative rail |
| VIN (Pins 3,4) | Positive input supply | Accepts 3.4V–60V input; powers internal regulators and high-side switch driver |
| RUN (Pin 5) | Enable control input | Logic-high threshold 1.2V rising; used with resistor divider to set precise VIN undervoltage lockout |
| GND (Pin 6) | Board ground sense | Reference point for RUN, MODE/SYNC, and PGOOD; must connect to clean PCB ground plane |
| MODE/SYNC (Pin 7) | Operating mode select / clock sync | Tie to GND for Burst Mode™ (high light-load efficiency); float for forced continuous mode (low ripple); accept external clock for synchronization |
| PGOOD (Pin 8) | Power-good open-drain output | Pulled low when VPGDFB < 0.555V or > 0.645V relative to VOUT–; 64-cycle blanking prevents transient glitches |
| PGDFB (Pin 9) | Power-good feedback node | Connect resistor divider from GND to VOUT– to set PGOOD trip thresholds; defines ±7.5% regulation window |
| VINREG (Pin 11) | Input voltage regulation sense | Monitor VIN droop; if voltage falls below 2V above VOUT–, reduces peak current to limit input draw |
| RT (Pin 12) | Oscillator frequency programming | Resistor to SVOUT– sets fSW = 1011/RT; 100kΩ yields ~1MHz; sync range ±50% of programmed value |
| ISET (Pin 14) | Output voltage programming / soft-start | 50µA sink; VOUT– = –50µA × RSET; add capacitor to VOUT– for controlled ramp-up (tSS ≈ 2.3 × RSET × CSET) |
| ITH (Pin 15) | Error amplifier output / compensation | Internal compensation enabled by tying to INTVCC; external components optimize loop response for minimal output capacitance |
| EXTVCC (Pin 16) | External INTVCC supply input | Bypass to VOUT– with ≥1µF; activates secondary LDO when >3.2V above VOUT– and VIN >5V above VOUT–, reducing power loss |
| INTVCC (Pin 17) | Internal LDO output | 3.3V or 3.1V above VOUT–; requires ≥2.2µF ceramic bypass to VOUT– for gate driver transient current |
| BOOST (Pin 18) | High-side gate driver supply | Connect 0.1µF bootstrap capacitor between BOOST and SW; sustains top-FET drive during duty cycles >90% |
| SW (Pins 19–25) | Switch node | Connects to inductor; carries high di/dt square wave; requires low-inductance layout and Kelvin connection for current sensing |
| SVOUT– (Pins 10,29) | Exposed pad / thermal & electrical return | Must be soldered to PCB copper; serves as primary thermal path and low-impedance return for VOUT– and internal circuits |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor VOUT programming | Enables precise negative output setting (e.g., –5V, –12V) with one external resistor and no trimming required |
| Board-ground-referenced I/O | RUN, PGOOD, and MODE/SYNC operate with respect to board GND - simplifies level-shifting and interface design |
| Programmable soft-start via ISET | Capacitor from ISET to VOUT– controls startup slew rate, preventing inrush current and output overshoot |
| Integrated 110mΩ/50mΩ MOSFETs | Eliminates external power switches and associated gate drivers, reducing BOM count and layout complexity |
| Accurate ±0.8% output voltage | Meets tight tolerance requirements for analog signal chains, data converters, and precision instrumentation |
| Overtemperature protection | Thermal shutdown activates above 125°C junction temperature, protecting device during overload or poor heatsinking |
Applications
| Industrial Process Control | Telecom Line Card Power |
|---|---|
Use Scenario: Generating –15V and –5V rails for analog front-end amplifiers and sensor signal conditioning in PLC modules. IC Role / Device Role / Timing Role: Inverting buck regulator providing isolated negative bias for op-amp inputs and ADC reference buffers. Use Value: Single-chip solution eliminates discrete inverter stages, reduces footprint by >40%, and maintains ±0.8% regulation across –40°C to 85°C ambient. | Use Scenario: Supplying –48V intermediate bus and –12V auxiliary rail in 48V telecom line cards with dynamic load steps. IC Role / Device Role / Timing Role: Primary negative DC/DC converter operating from 36–72V input, synchronized to system clock via MODE/SYNC pin. Use Value: 92% efficiency at full load and Burst Mode™ operation extend hold-up time during brownouts while minimizing standby power. |
| Distributed Power Systems | Test & Measurement Equipment |
Use Scenario: Local generation of –24V and –5V from 48V backplane in modular instrumentation racks. IC Role / Device Role / Timing Role: Point-of-load inverting regulator with programmable soft-start to prevent system-level reset during hot-swap insertion. Use Value: RT-programmed 1MHz switching enables compact 2.2µH inductors; EXTVCC option reduces thermal stress at high input voltages. | Use Scenario: Biasing high-voltage op-amps and DAC output stages in portable oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Precision negative rail generator with low-noise forced continuous mode operation for analog signal integrity. Use Value: 60ns minimum on-time and peak current mode control ensure stable regulation under rapid load transients up to 3A/µs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7151SUFD#TRPBF | Higher 80V input rating, 5A output, ±0.5% accuracy, but larger 32-lead 5mm × 6mm QFN package | Supports higher input surges (e.g., 48V telecom transients) and greater output current; less suitable for space-constrained designs | Select when input voltage exceeds 60V or output current >4A is required; verify PCB layout accommodates larger thermal pad |
| TPS63710DRRR | 3.5V–20V input, –12V max output, 2A, integrated compensation, but no Burst Mode™ or external frequency programming | Lower cost and simpler layout for fixed-output, low-current applications; lacks programmability and wide-VIN capability | Choose for cost-sensitive, low-power embedded systems where 60V input and 4A output are unnecessary |
Compared with LTC7149EUFD#TRPBF, LTC7151SUFD#TRPBF offers higher voltage/current headroom at the expense of size and cost, while TPS63710DRRR trades flexibility for integration and simplicity in lower-performance applications.
Availability
LTC7149EUFD#TRPBF is available at Aetrix Electronics and suitable for industrial process control, telecom line card power, and distributed power systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC7149EUFD#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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC7149EUFD#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC regulators, designed specifically for demanding negative-rail power conversion in space- and thermal-constrained applications.
FAQ
What is the maximum input voltage supported by the LTC7149EUFD#TRPBF?
The LTC7149EUFD#TRPBF supports an absolute maximum input voltage of 64V (VIN to VOUT–), with recommended operating range up to 60V. Exceeding 60V may trigger overvoltage lockout at VIN + |VOUT–| > 64V, suspending switching until voltage falls below 62V due to 2V hysteresis. This protects internal 110mΩ/50mΩ MOSFETs and gate drivers during transient events.
How is the output voltage programmed on the LTC7149EUFD#TRPBF?
The LTC7149EUFD#TRPBF uses a precision 50µA current source at the ISET pin to program VOUT– via a single resistor RSET connected between ISET and VOUT–, where VOUT– = –50µA × RSET. For example, a 100kΩ resistor sets –5.0V output. The ISET pin also accepts an external soft-start capacitor to control ramp rate, with tSS ≈ 2.3 × RSET × CSET for 0%–90% transition.
Does the LTC7149EUFD#TRPBF support external clock synchronization?
Yes, the LTC7149EUFD#TRPBF supports external clock synchronization via the MODE/SYNC pin, which accepts an external clock signal within ±50% of the frequency set by the RT resistor. For example, if RT programs 1MHz, the external clock must be between 500kHz and 1.5MHz. Synchronization forces forced continuous mode operation and eliminates beat frequencies in multi-regulator systems.
What thermal considerations apply to the LTC7149EUFD#TRPBF package?
The LTC7149EUFD#TRPBF uses a 28-lead 4mm × 5mm QFN with exposed SVOUT– pad (Pin 29), requiring soldering to a PCB copper plane for thermal performance. Its θJA is 43°C/W; insufficient pad area or poor thermal vias increase junction temperature, potentially triggering overtemperature protection above 125°C. Thermal design must account for both power dissipation in internal MOSFETs and INTVCC LDO losses.
Can the LTC7149EUFD#TRPBF operate with a pre-biased output?
Yes, the LTC7149EUFD#TRPBF safely starts into a pre-biased VOUT– by remaining in Burst Mode™ and keeping power switches off until the ISET pin voltage ramps up to match VOUTSNS. Once VISET = VOUTSNS, switching begins and VOUT– decreases at the programmed rate. This prevents reverse current flow and output overshoot, critical for hot-swap and redundant power systems.
LTC7149EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Negative
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- -28V
- Current - Output:
- 4A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC7149EUFD#TRPBF FAQ
1.How can I place an order for LTC7149EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7149EUFD#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 LTC7149EUFD#TRPBF reliable?
The price and inventory of LTC7149EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7149EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7149EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7149EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7149EUFD#TRPBF?
LTC7149EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7149EUFD#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 LTC7149EUFD#TRPBF?
For technical support, including LTC7149EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7149EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC7149EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7149EUFD#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 LTC7149EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7149EUFD#TRPBF?
All LTC7149EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7149EUFD#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 LTC7149EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7149EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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