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Analog Devices Inc. LTC3707EGN#TRPBF
- Part No.:
- LTC3707EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3707EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,794
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Product details
Overview
LTC3707EGN#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving two independent N-channel MOSFET stages for high-efficiency 5V/3.3V power conversion. It features 180° phase interleaving, OPTI-LOOP® compensation, ±1.5% output voltage accuracy over temperature, 3.5V–30V input range, and integrated 5V/3.3V standby regulators - used in notebook computers, battery-powered instrumentation, and DC power distribution systems.
For engineers reviewing the LTC3707EGN#TRPBF datasheet, LTC3707EGN#TRPBF pinout, LTC3707EGN#TRPBF application, or LTC3707EGN#TRPBF equivalent, key selection criteria include dual-channel current-mode control with 180° phasing, adjustable 150–300kHz switching frequency, forced continuous/Burst Mode®/constant-frequency operation selection via FCB pin, remote sense capability, and latch-off short-circuit protection with foldback limiting.
Technical Context
The LTC3707EGN#TRPBF implements a constant-frequency, current-mode architecture with two independent control loops operating 180° out of phase to reduce input ripple and EMI. Each channel uses differential current sensing (SENSE±), error amplifier output at ITH pins, and precision 0.8V reference for feedback regulation.
It supports three low-power modes via the FCB pin: Burst Mode® (for highest light-load efficiency), constant-frequency discontinuous conduction mode (for low-noise operation down to ~1% load), and forced continuous PWM (for bidirectional current handling). The IC integrates dual gate drivers (TG/BG), internal 5V LDO (INTVCC), 3.3V linear regulator (3.3VOUT), and PGOOD monitoring with ±7.5% output window detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 30V - supports wide battery chemistries including 12V lead-acid, multi-cell Li-ion, and industrial 24V rails. |
| Output Voltage Accuracy | ±1.5% over –40°C to +85°C - ensures stable microprocessor core/supply rail regulation across thermal extremes. |
| Switching Frequency Range | 150kHz to 300kHz (adjustable via FREQSET) - balances efficiency, size, and EMI for compact DC/DC designs. |
| Duty Cycle Max | 99.4% - enables ultra-low dropout operation (e.g., 5V out from 5.2V in) without external boost circuitry. |
| Quiescent Current (Shutdown) | 20μA - minimizes battery drain during system sleep states in portable equipment. |
| Current Sense Threshold | 65mV to 88mV (programmable via RSENSE) - sets precise overcurrent trip point with minimal power loss in sense resistor. |
| PGOOD Window | ±7.5% of nominal output - provides robust power-good assertion for sequenced system startup and fault detection. |
Pinout & Package
Package: 28-lead narrow SSOP (GN), RoHS-compliant, –40°C to +85°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 15) | Soft-start & shutdown control inputs | Capacitor-programmable ramp time; also triggers timed latchoff during sustained short-circuit conditions. |
| SENSE1+, SENSE2+ / SENSE1–, SENSE2– (Pins 2,3,13,14) | Differential current sense inputs | Enable accurate peak-current-mode control with programmable trip threshold (65–88mV) and foldback limiting. |
| VOSENSE1, VOSENSE2 (Pins 4, 12) | Remote feedback voltage inputs | Support Kelvin sensing to reject PCB trace IR drop and maintain tight output regulation under dynamic load. |
| FCB (Pin 7) | Mode selection & secondary winding regulation input | Selects Burst Mode®, constant-frequency, or forced PWM; can regulate auxiliary outputs by forcing continuous conduction. |
| TG1, TG2 / BG1, BG2 (Pins 16,27,19,23) | Top/bottom N-MOSFET gate drivers | High-current (3A peak), fast-transition (≤110ns) drivers with bootstrap (TG) and ground-referenced (BG) outputs. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Asserts low when either VOSENSE voltage deviates >±7.5% - enables safe system enable sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| 180° phased dual controllers | Reduces RMS input capacitor current by up to 30%, enabling smaller, lower-ESR input capacitors and lower EMI. |
| OPTI-LOOP® compensation | Allows stable loop response across wide variations in output capacitance (ceramic or polymer) and ESR without redesign. |
| Integrated 3.3V linear regulator | Delivers 10mA DC / 50mA peak for auxiliary biasing (e.g., USB PHY, level shifters), eliminating need for discrete LDO. |
| Output overvoltage protection | Latches bottom MOSFET on until VOSENSE returns within ±7.5%, preventing damage to downstream logic or memory. |
| Adjustable soft-start current ramping | IRUN/SS = 0.5–1.2μA enables precise control of inrush current during startup, protecting input source and MOSFETs. |
Applications
| Notebook Power Management | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Dual-rail (5V/3.3V) power supply for CPU, chipset, and peripheral interfaces in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing high-current, low-voltage rails with tight transient response and phase interleaving. Use Value: Reduces input capacitor count and size by 40% vs. single-phase design while maintaining <1% output ripple under 5A load steps. |
Use Scenario: Precision analog front-end and digital subsystem power in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Primary DC/DC controller delivering regulated 5V and 3.3V from 7.2V Li-ion battery pack with remote sensing and low-noise operation. Use Value: OPTI-LOOP® compensation ensures stability with low-ESR ceramic output caps; 20μA shutdown IQ extends battery life beyond 100 hours in sleep mode. |
| DC Power Distribution Systems | Industrial Embedded Controllers |
Use Scenario: Centralized 24V-to-5V/3.3V conversion for distributed I/O modules in factory automation racks. IC Role / Device Role / Timing Role: High-reliability dual-output controller supporting wide input (3.5–30V), overvoltage protection, and PGOOD sequencing. Use Value: ±1.5% output accuracy and ±7.5% PGOOD window ensure deterministic startup and fault isolation across 10+ modules. |
Use Scenario: Power management for ARM-based industrial gateways requiring isolated 5V/3.3V rails and standby wake-up capability. IC Role / Device Role / Timing Role: Dual buck controller with STBYMD-enabled 3.3VOUT keep-alive function and RUN/SS-controlled soft-start sequencing. Use Value: STBYMD >2V activates 3.3VOUT independently of main regulators, powering real-time clock and wake-up circuitry during deep sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3728IGN#TRPBF | Higher max frequency (600kHz), no integrated 3.3V LDO, requires external VREF for 0.6V output setting. | Better suited for space-constrained designs needing higher switching frequency and lower output voltages (e.g., 1.2V core rails). | Select when higher frequency and sub-3.3V outputs are required; omit if 3.3VOUT bias rail is needed. |
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFETs (40V/5A), fixed 0.6V reference, no FCB mode selection. | Targeted at cost-sensitive, medium-power applications where board area and BOM count outweigh flexibility needs. | Choose for simplified layout and lower component count; avoid when discrete MOSFET selection, remote sensing, or multi-mode operation is critical. |
Compared with LTC3707EGN#TRPBF, LTC3728IGN#TRPBF offers higher frequency headroom but lacks the integrated 3.3V bias rail, while MP2918GL-Z reduces external component count at the expense of configurability and precision remote sensing - making LTC3707EGN#TRPBF optimal for high-accuracy, flexible, dual-rail portable and industrial power systems.
Availability
LTC3707EGN#TRPBF is available at Aetrix Electronics and suitable for notebook computing, battery-operated instrumentation, and industrial embedded power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3707EGN#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 reliability testing and automotive-grade qualification pathways.
The LTC3707EGN#TRPBF belongs to Linear's high-efficiency dual-phase DC/DC controller product line, designed specifically for portable and battery-powered systems demanding low quiescent current, precise regulation, and robust fault protection.
FAQ
What is the maximum duty cycle supported by the LTC3707EGN#TRPBF?
The LTC3707EGN#TRPBF supports up to 99.4% duty cycle in dropout operation, enabling near-unity conversion (e.g., 5V output from 5.2V input) without external boost circuitry. This is achieved via internal dropout detection that forces periodic top-FET off-time to recharge the bootstrap capacitor while maintaining regulation - a critical feature for battery-powered systems nearing end-of-discharge.
How does the FCB pin affect operating mode selection in the LTC3707EGN#TRPBF?
The FCB pin on the LTC3707EGN#TRPBF selects among three distinct operating modes: below 0.8V → forced continuous PWM; between 0.8V and (INTVCC – 2V) → Burst Mode®; tied to INTVCC → constant-frequency discontinuous mode. This single-pin interface allows dynamic optimization of efficiency, noise, and output current capability without changing external components - essential for adaptive power management in portable devices.
Can the LTC3707EGN#TRPBF regulate a secondary winding using the FCB pin?
Yes - the LTC3707EGN#TRPBF can regulate an auxiliary winding (e.g., from a coupled inductor) by applying a scaled feedback signal to the FCB pin. When FCB voltage drops below 0.8V, the controller forces both channels into continuous conduction, allowing the error amplifier to servo the secondary output. This eliminates the need for a separate flyback or auxiliary controller in multi-output designs.
What is the purpose of the STBYMD pin on the LTC3707EGN#TRPBF?
The STBYMD pin on the LTC3707EGN#TRPBF provides three-state control: grounded → shuts down both controllers; open → enables normal RUN/SS startup; >2V → activates the internal 3.3VOUT regulator independently. This allows "keep-alive" power for RTC or wake-up circuitry during full system shutdown - a key requirement for low-power embedded systems requiring instant-on capability.
Does the LTC3707EGN#TRPBF support remote voltage sensing, and how is it implemented?
Yes - the LTC3707EGN#TRPBF supports true remote sensing via dedicated VOSENSE1 and VOSENSE2 pins (Pins 4 and 12), which accept feedback signals from external resistive dividers placed directly at the load. This compensates for PCB trace resistance and ensures ±1.5% output accuracy at the point of load, critical for high-current, low-voltage rails in CPUs and FPGAs where even 50mV drop matters.
LTC3707EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 28V
- Frequency - Switching:
- 220kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3707EGN#TRPBF FAQ
1.How can I place an order for LTC3707EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3707EGN#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 LTC3707EGN#TRPBF reliable?
The price and inventory of LTC3707EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3707EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3707EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3707EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3707EGN#TRPBF?
LTC3707EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3707EGN#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 LTC3707EGN#TRPBF?
For technical support, including LTC3707EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3707EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3707EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3707EGN#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 LTC3707EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3707EGN#TRPBF?
All LTC3707EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3707EGN#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 LTC3707EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3707EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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