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Analog Devices Inc. LTC3704EMS#TRPBF
- Part No.:
- LTC3704EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3704EMS#TRPBF.pdf
- Description:
- IC REG CTRLR CUK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,590
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Product details
Overview
LTC3704EMS#TRPBF from Analog Devices (formerly Linear Technology) is a wide-input, current-mode positive-to-negative DC/DC controller driving an external N-channel MOSFET without requiring a sense resistor. It operates from 2.5V to 36V input, delivers up to 5A output current at –5.0V, achieves ≥90% efficiency at full load, and supports programmable switching frequency from 50kHz to 1MHz. It is used in telecom SLIC power supplies and portable negative rail generation.
For engineers reviewing the LTC3704EMS#TRPBF datasheet, LTC3704EMS#TRPBF pinout, LTC3704EMS#TRPBF application, or LTC3704EMS#TRPBF equivalent, key selection criteria include its no-RSENSE operation via MOSFET RDS(ON) sensing, ±1% internal reference, 10μA shutdown quiescent current, 92% max duty cycle, and MSOP-10 package compatibility with space-constrained industrial and telecom designs.
Technical Context
The LTC3704EMS#TRPBF implements a constant-frequency, current-mode control architecture with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier drives the ITH pin (0.3V–1.4V range) to set the current comparator threshold, enabling precise peak-current regulation.
It integrates a 5.2V low-dropout regulator (±25mV line regulation, 280mV dropout at 20mA) powering internal logic and gate driver, and features dual-mode operation: Burst Mode (enabled by grounding MODE/SYNC) for <250μA light-load IQ, or continuous/pulse-skip mode (MODE/SYNC tied to INTVCC) for fixed-frequency, low-ripple performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 36V - supports wide-range battery and telecom inputs without external regulators |
| Output Polarity | Positive-to-Negative - generates regulated negative voltage from positive source, e.g., –5.0V |
| Switching Frequency | 50kHz to 1MHz - set by single RT resistor; enables optimization of efficiency vs. size |
| Max Duty Cycle | 92% typical - allows high step-down ratio in buck-derived topologies |
| Reference Accuracy | ±1% - ensures tight output voltage regulation across temperature and line |
| Shutdown IQ | 10μA - extends battery life in portable systems during standby |
| NFB Reference Voltage | –1.230V - stable negative feedback reference for precision output programming |
Pinout & Package
The LTC3704EMS#TRPBF is housed in a thermally enhanced 10-lead MSOP package (3mm × 3mm, 0.5mm pitch), rated for –40°C to 85°C operation (E-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/UVLO Input | 1.248V falling threshold with 100mV hysteresis; controls startup/shutdown without external circuitry |
| ITH (Pin 2) | Error Amplifier Output | 0.3V–1.4V control voltage setting current comparator threshold for loop stability |
| NFB (Pin 3) | Negative Feedback Input | Receives resistor-divider voltage referenced to –1.230V; determines output regulation point |
| FREQ (Pin 4) | Frequency Programming | 0.62V nominal; RT resistor to GND sets oscillator frequency from 50kHz–1MHz |
| MODE/SYNC (Pin 5) | Mode Control / Clock Input | Ground = Burst Mode; INTVCC = pulse-skip; external clock ≤1.3×fOSC enables synchronization |
| GND (Pin 6) | Power Ground | Common return for control logic, gate driver, and current sense reference |
| GATE (Pin 7) | MOSFET Gate Driver Output | Capable of driving N-channel MOSFET gates with 17ns rise / 8ns fall time (CL = 3300pF) |
| INTVCC (Pin 8) | Internal LDO Output | 5.2V ±25mV regulated supply for gate driver and internal circuits; requires ≥4.7μF local bypass |
| VIN (Pin 9) | Main Power Input | Supplies bias for internal circuits; must be decoupled close to IC with low-ESR capacitor |
| SENSE (Pin 10) | Current Sense Input | Accepts VDS across MOSFET (max 36V) or shunt resistor; enables no-RSENSE operation |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor required | Uses MOSFET RDS(ON) for current sensing-reduces BOM count, improves efficiency, eliminates sense resistor losses |
| Programmable burst mode | User-selectable via MODE/SYNC pin-enables micropower operation (<250μA) at light loads while maintaining regulation |
| Internal 5.2V LDO | Self-powered gate driver and logic-eliminates need for external bias supply; supports up to 50mA load |
| High max duty cycle | 92% typical-enables high conversion ratios in positive-to-negative topologies with minimal VIN headroom |
| Wide input voltage range | 2.5V to 36V-supports single-cell Li-ion to 24V industrial rails without pre-regulation |
Applications
| SLIC Power Supplies | Telecom Power Supplies |
|---|---|
Use Scenario: Generating –48V or –5V bias for subscriber line interface circuits in VoIP gateways and DSLAMs. IC Role / Device Role / Timing Role: Positive-to-negative controller regulating stable negative rail using external N-MOSFET and diode. Use Value: Eliminates discrete sense resistor, improving efficiency >90% at 3A and reducing thermal stress on PCB. | Use Scenario: Providing isolated negative auxiliary rails in telecom rectifier modules and base station power systems. IC Role / Device Role / Timing Role: High-reliability DC/DC controller supporting 36V max input and synchronized operation to system clock. Use Value: Synchronization capability (up to 1.3×fOSC) suppresses EMI in dense telecom chassis environments. |
| Portable Electronic Equipment | Cable and DSL Modems |
Use Scenario: Creating compact –5V rail for analog front-ends and op-amp bias in handheld test equipment and medical sensors. IC Role / Device Role / Timing Role: Low-IQ controller enabling battery-powered operation with 10μA shutdown current. Use Value: Burst Mode reduces no-load IQ to 250μA, extending runtime in intermittent-use portable devices. | Use Scenario: Supplying regulated –12V or –5V for PHY layer interfaces and line drivers in residential broadband modems. IC Role / Device Role / Timing Role: MSOP-10 controller interfacing with low-RDS(ON) MOSFETs (e.g., Si4884) for high-density layout. Use Value: 10-lead MSOP footprint minimizes board area while supporting >5A output with external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar positive-to-negative DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3703EMS#TRPBF | Single-ended N-channel controller with identical pinout but no MODE/SYNC sync capability; fixed Burst Mode only | Lacks external clock synchronization and pulse-skip mode; limited to burst-only light-load behavior | Select when sync is unnecessary and cost sensitivity outweighs flexibility |
| LM5122MMX/NOPB | Wide-input synchronous boost/buck-boost controller; supports negative output via inverting topology; requires external MOSFETs and more external components | Supports higher output currents (>10A) and wider VIN (3V–65V); lacks integrated LDO and no-RSENSE optimization | Select for >36V input or synchronous rectification needs; expect larger solution size and higher design complexity |
Compared with LTC3703EMS#TRPBF, the LTC3704EMS#TRPBF adds synchronization and user-selectable pulse-skip mode; compared with LM5122MMX/NOPB, it offers lower component count and superior light-load efficiency via integrated LDO and RDS(ON) sensing-but is limited to 36V input and asynchronous rectification.
Availability
LTC3704EMS#TRPBF is available at Aetrix Electronics and suitable for SLIC power supplies, telecom power systems, and portable electronic equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3704EMS#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3704EMS#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for compact, high-reliability positive-to-negative conversion in telecom, industrial, and portable applications.
FAQ
What is the maximum input voltage supported by the LTC3704EMS#TRPBF?
The LTC3704EMS#TRPBF supports a maximum input voltage of 36V per its Absolute Maximum Ratings. For applications requiring higher switch-node voltages (e.g., VDS >36V), the SENSE pin can be connected to a source-resistor instead of the MOSFET drain-enabling safe operation beyond the 36V limit while retaining current-mode control. This configuration is explicitly validated in the LTC3704EMS#TRPBF datasheet Figure 2b.
Does the LTC3704EMS#TRPBF require an external current sense resistor?
No, the LTC3704EMS#TRPBF does not require an external current sense resistor. It achieves high-efficiency current sensing by monitoring the voltage drop across the RDS(ON) of the external N-channel MOSFET-a feature enabled by its dedicated SENSE pin and internal current comparator. This no-RSENSE architecture reduces power loss, component count, and PCB area, as confirmed in the LTC3704EMS#TRPBF datasheet Features and Applications sections.
How is the switching frequency programmed on the LTC3704EMS#TRPBF?
The switching frequency of the LTC3704EMS#TRPBF is programmed using a single external resistor (RT) connected between the FREQ pin (Pin 4) and ground. The nominal FREQ pin voltage is 0.62V, and RT sets fOSC over a 50kHz to 1MHz range. A lookup graph (Figure 6 in the datasheet) correlates RT values to frequency; for example, 80.6kΩ yields ~300kHz. No additional components are needed for basic frequency setting.
What is the purpose of the MODE/SYNC pin on the LTC3704EMS#TRPBF?
The MODE/SYNC pin (Pin 5) on the LTC3704EMS#TRPBF serves two functions: selecting operating mode (Burst Mode vs. pulse-skip/continuous) and enabling external clock synchronization. Grounding the pin enables Burst Mode for ultra-low IQ (<250μA); tying it to INTVCC disables Burst Mode for fixed-frequency operation; applying an external logic-level clock (≥2V, ≤1.3×fOSC) synchronizes switching to reduce EMI. All behaviors are documented in the LTC3704EMS#TRPBF datasheet Section "Pin Functions" and "Operation".
Can the LTC3704EMS#TRPBF operate from a 2.5V input supply?
Yes, the LTC3704EMS#TRPBF is fully specified to operate from a minimum input voltage of 2.5V, as stated in its Electrical Characteristics table (VIN(MIN) = 2.5V). This low start-up voltage enables use in single-cell Li-ion (2.7–4.2V) and NiMH battery-powered systems. The internal 5.2V LDO remains functional down to 2.5V input, and the RUN pin threshold (1.248V) allows reliable enable/disable control even at low VIN.
LTC3704EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Cuk
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.5V ~ 36V
- Frequency - Switching:
- 50kHz ~ 1MHz
- Duty Cycle (Max):
- 92%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC3704EMS#TRPBF FAQ
1.How can I place an order for LTC3704EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3704EMS#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 LTC3704EMS#TRPBF reliable?
The price and inventory of LTC3704EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3704EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3704EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3704EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3704EMS#TRPBF?
LTC3704EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3704EMS#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 LTC3704EMS#TRPBF?
For technical support, including LTC3704EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3704EMS#TRPBF requirements.
6.How does Aetrix verify that LTC3704EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3704EMS#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 LTC3704EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3704EMS#TRPBF?
All LTC3704EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3704EMS#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 LTC3704EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3704EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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