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Analog Devices Inc. LTC3704IMS#TRPBF
- Part No.:
- LTC3704IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3704IMS#TRPBF.pdf
- Description:
- IC REG CTRLR CUK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,482
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Product details
Overview
LTC3704IMS#TRPBF from Analog Devices (formerly Linear Technology) is a wide-input, current-mode positive-to-negative DC/DC controller IC that drives an external N-channel MOSFET without requiring a discrete current sense resistor. It operates from 2.5V to 36V input, delivers up to 5A output current at –5.0V, achieves ≥90% conversion efficiency, and supports programmable switching frequency from 50kHz to 1MHz - ideal for telecom SLIC supplies and portable negative rail generation.
For engineers reviewing the LTC3704IMS#TRPBF datasheet, LTC3704IMS#TRPBF pinout, LTC3704IMS#TRPBF application, or LTC3704IMS#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to this MSOP-10 variant.
Technical Context
The LTC3704IMS#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–1.23V range) to modulate peak inductor current via a voltage-to-current converter feeding the current comparator.
It integrates a 5.2V low-dropout regulator (INTVCC) capable of sourcing 50mA, supports dual sensing methods (MOSFET RDS(ON) or external shunt), and features a MODE/SYNC pin enabling Burst Mode (for <100μA light-load efficiency) or synchronized continuous mode (up to 1.3× fOSC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 36V - supports direct connection to 3.3V, 5V, 12V, and 24V rails without pre-regulation. |
| Output Polarity & Topology | Positive-to-negative buck-boost - generates regulated negative output from positive input using single inductor and coupling capacitor. |
| Switching Frequency | 50kHz to 1MHz, set by single RT resistor - enables tradeoff between efficiency (lower f) and size (higher f). |
| Max Duty Cycle | 92% typical - allows high step-down ratio operation even at minimum input voltage. |
| NFB Reference Voltage | –1.230V ±1% - precise negative feedback threshold enabling accurate output voltage programming (e.g., –5.0V ±1.5%). |
| Shutdown Quiescent Current | 10μA typical - ensures battery runtime extension in always-on systems with enable control. |
| Operating Temperature | –40°C to 125°C (I-grade) - qualified for industrial and telecom equipment operating in harsh thermal environments. |
Pinout & Package
Package: 10-lead MSOP (3mm × 3mm, 0.5mm pitch), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/UVLO Input | 1.248V falling threshold with 100mV hysteresis - programs precise turn-on/off points for input voltage supervision. |
| ITH (Pin 2) | Error Amplifier Output | 0.3V–1.23V control voltage - sets current comparator trip point; used for loop compensation and soft-start. |
| NFB (Pin 3) | Negative Feedback Input | Receives divided output voltage; internal –1.230V reference enables stable regulation of negative outputs. |
| FREQ (Pin 4) | Frequency Programming | 0.62V nominal voltage - connects to ground via RT resistor to set oscillator frequency (50kHz–1MHz). |
| MODE/SYNC (Pin 5) | Mode Control / Clock Sync | Ground = Burst Mode; INTVCC or >2V = continuous mode; external clock input up to 1.3× fOSC. |
| GND (Pin 6) | Power Ground | Reference node for all analog and power circuits; requires low-inductance connection to PCB ground plane. |
| GATE (Pin 7) | MOSFET Gate Driver Output | Capable of driving >1nF gate capacitance; rise/fall times ≤100ns with 3.3nF load - supports fast-switching Si MOSFETs. |
| INTVCC (Pin 8) | Internal LDO Output | 5.2V ±2%, supplies gate driver and logic; requires ≥4.7μF local ceramic/tantalum bypass to GND. |
| VIN (Pin 9) | Main Power Input | Accepts full 2.5V–36V range; must be decoupled with low-ESR capacitor near IC pins to suppress transients. |
| SENSE (Pin 10) | Current Sense Input | Connects to MOSFET drain (for VDS sensing, max 36V) or source shunt (for >36V VSW applications). |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE operation | Uses MOSFET RDS(ON) for current sensing - eliminates power loss and board space of discrete shunt resistor. |
| Burst Mode efficiency | Reduces quiescent current to 250μA at light loads - extends battery life in standby or low-power telecom modules. |
| Programmable frequency | Single RT resistor sets fOSC across 20:1 range - simplifies EMI tuning and magnetics selection. |
| High-duty-cycle capability | 92% max duty cycle - enables deep step-down (e.g., 36V→–5V) without pulse skipping or instability. |
| Integrated 5.2V LDO | Supplies gate driver and internal circuitry - removes need for external bias supply in most designs. |
Applications
| SLIC Power Supplies | Telecom Line Cards |
|---|---|
Use Scenario: Generating –48V or –72V bias for subscriber line interface circuits in DSLAMs and VoIP gateways. IC Role / Device Role / Timing Role: Positive-to-negative controller managing high-efficiency, isolated negative rail generation with tight regulation under dynamic line loading. Use Value: Eliminates external sense resistor loss, enabling >90% efficiency at 3A load while meeting GR-909 thermal limits. |
Use Scenario: Providing –5V or –12V auxiliary rails for FPGA I/O banks, PHY interfaces, and analog front-ends on carrier-grade line cards. IC Role / Device Role / Timing Role: Primary negative rail controller supporting burst-mode operation during low-traffic periods to reduce system standby power. Use Value: 10μA shutdown current and programmable UVLO allow precise brown-out recovery and hot-swap compatibility. |
| Portable Test Equipment | Cable Modem Power Stages |
Use Scenario: Creating isolated –5V supply for op-amp biasing and ADC reference in handheld spectrum analyzers and signal generators. IC Role / Device Role / Timing Role: Compact negative rail generator using single inductor and coupling capacitor topology to minimize solution footprint. Use Value: MSOP-10 package and no-RSENSE architecture reduce BOM count by 3 components versus traditional controllers. |
Use Scenario: Supplying –5.0V @ 5A for DOCSIS 3.1 RF amplifiers and upstream transmitter stages in cable modems and eMTAs. IC Role / Device Role / Timing Role: High-current negative rail controller with 92% max duty cycle enabling stable operation down to 5V input during brownout conditions. Use Value: Internal slope compensation prevents subharmonic oscillation at >50% duty cycle - critical for consistent RF stage performance. |
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 |
|---|---|---|---|
| LTC3787IMS#TRPBF | Wider VIN range (4.5V–60V); includes VOUT tracking and phase-lock loop; no integrated LDO - requires external 5V bias. | Targeted at higher-voltage industrial supplies (>48V input); lacks Burst Mode - less suitable for battery-powered devices. | Select when input exceeds 36V or multi-rail tracking is required; avoid if micropower shutdown or compactness is critical. |
| TPS40057PWPR | Fixed 100kHz–1MHz frequency; no internal LDO; requires external 5V bias; supports only shunt-based current sensing. | Designed for cost-sensitive telecom infrastructure; lacks RDS(ON) sensing - adds 0.5W+ loss at 5A vs. LTC3704IMS#TRPBF. | Choose for price-driven, non-battery applications where efficiency >90% is not mandatory and layout space allows extra components. |
Compared with LTC3787IMS#TRPBF and TPS40057PWPR, the LTC3704IMS#TRPBF uniquely combines no-RSENSE operation, integrated 5.2V LDO, 10μA shutdown, and Burst Mode - making it the only option among the three optimized for compact, high-efficiency, battery-aware negative rail generation.
Availability
LTC3704IMS#TRPBF is available at Aetrix Electronics and suitable for SLIC power supplies, telecom line cards, portable test equipment, and cable modem power stages requiring stable component supply, long-term lifecycle support, and guaranteed I-grade temperature performance.
Supply support for LTC3704IMS#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, serving industrial, automotive, communications, and healthcare markets.
The LTC3704IMS#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, specifically engineered for low-noise, high-density negative rail generation in space-constrained telecom and portable electronics.
FAQ
What is the maximum input voltage supported by the LTC3704IMS#TRPBF?
The LTC3704IMS#TRPBF supports a maximum input voltage of 36V on the VIN pin. For applications requiring higher switch-node voltages (e.g., >36V), the SENSE pin can be connected to a resistor in the MOSFET source instead of the drain - allowing safe operation with VSW exceeding 36V while maintaining current-mode control.
Does the LTC3704IMS#TRPBF require an external current sense resistor?
No, the LTC3704IMS#TRPBF does not require an external current sense resistor. It uses the power MOSFET's RDS(ON) for current sensing by connecting the SENSE pin to the MOSFET drain - eliminating sense resistor losses and improving efficiency. A shunt resistor may be used optionally for higher-precision sensing or when VSW > 36V.
How is the switching frequency programmed on the LTC3704IMS#TRPBF?
The switching frequency of the LTC3704IMS#TRPBF is programmed using a single resistor (RT) connected between the FREQ pin (Pin 4) and ground. The nominal FREQ pin voltage is 0.62V, and RT values from ~10kΩ to 300kΩ set frequencies from 1MHz down to 50kHz, per the RT vs. fOSC curve in the datasheet.
What is the function of the MODE/SYNC pin on the LTC3704IMS#TRPBF?
The MODE/SYNC pin (Pin 5) on the LTC3704IMS#TRPBF controls operating mode: grounding it enables Burst Mode for ultra-low-light-load efficiency; connecting it to INTVCC disables Burst Mode for continuous conduction; applying an external clock synchronizes switching to frequencies up to 1.3× fOSC, reducing EMI.
Can the LTC3704IMS#TRPBF generate a –5.0V output at 5A?
Yes, the LTC3704IMS#TRPBF is validated for –5.0V @ 5A output in typical applications (e.g., Figure 1 in the datasheet). Achieving this requires proper selection of a low-RDS(ON) N-channel MOSFET (e.g., Si4884), appropriate inductor (e.g., BH510-1009), and adequate thermal management - especially at high VIN or ambient temperatures.
LTC3704IMS#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC3704IMS#TRPBF FAQ
1.How can I place an order for LTC3704IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3704IMS#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 LTC3704IMS#TRPBF reliable?
The price and inventory of LTC3704IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3704IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3704IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3704IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3704IMS#TRPBF?
LTC3704IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3704IMS#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 LTC3704IMS#TRPBF?
For technical support, including LTC3704IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3704IMS#TRPBF requirements.
6.How does Aetrix verify that LTC3704IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3704IMS#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 LTC3704IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3704IMS#TRPBF?
All LTC3704IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3704IMS#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 LTC3704IMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3704IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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