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Analog Devices Inc. LTC3701EGN#PBF
- Part No.:
- LTC3701EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3701EGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:382
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Product details
Overview
LTC3701EGN#PBF from Analog Devices (formerly Linear Technology) is a 2-phase, dual-channel, constant-frequency current-mode step-down DC/DC controller designed for low-input-voltage systems (2.5V–10V). It delivers precise 0.8V ±2% reference regulation, 550kHz nominal switching frequency, and independent soft-start per channel - enabling high-efficiency power conversion in space-constrained portable electronics with interleaved input current reduction.
For engineers reviewing the LTC3701EGN#PBF datasheet, LTC3701EGN#PBF pinout, LTC3701EGN#PBF application, or LTC3701EGN#PBF equivalent, key selection considerations include its out-of-phase dual-control architecture, P-channel MOSFET gate drive capability, PLL-based synchronization support (300–750kHz), dropout operation at 100% duty cycle, and integrated output overvoltage/short-circuit protection.
Technical Context
The LTC3701EGN#PBF implements two independent current-mode control loops operating 180° out of phase, minimizing input capacitor RMS current and EMI. Each channel features an error amplifier with ITH/RUN compensation node, differential current sensing (SENSE±), and dedicated VFB feedback input referenced to a trimmed 0.8V internal voltage source.
Its phase-locked loop accepts external clock inputs (300–750kHz) on EXTCLK/MODE and uses PLLLPF as both oscillator control voltage and low-pass filter node. Burst Mode® operation is selectable via EXTCLK/MODE logic level, while shutdown, UVLO (2.00V rising threshold), and PGOOD monitoring are fully integrated without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 10V - supports single-cell Li-ion (2.7–4.2V) and multi-cell battery inputs without pre-regulation. |
| Switching Frequency | 550kHz nominal (300–750kHz adjustable via PLLLPF voltage) - enables compact magnetics and low-output-ripple designs. |
| Reference Voltage | 0.8V ±2% over –40°C to 85°C - ensures tight output regulation across industrial temperature range. |
| Quiescent Current | 460µA typical - extends battery life in always-on portable systems. |
| Current Sense Threshold | 120mV typical (95–145mV range) - sets peak inductor current with minimal sensing loss. |
| Duty Cycle Capability | 100% - maintains regulation during low-VIN dropout conditions by holding P-MOSFET continuously on. |
| PGOOD Accuracy | ±8% window around VFB - provides reliable system power sequencing and fault detection. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), 0.15mm pitch, 5.0mm × 6.2mm footprint - optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– / SENSE2– (1, 8) | Differential current sense (–) input | Connects to low-side of current-sense resistor; enables accurate peak-current mode control per channel. |
| ITH/RUN1 / ITH/RUN2 (2, 6) | Error amplifier output & run control | Sets peak current limit; <0.35V disables respective channel; internal 0.5µA soft-start charge source. |
| VFB1 / VFB2 (3, 5) | Feedback voltage input | Monitors divided output voltage; compared to 0.8V reference to regulate each output independently. |
| SGND (4) | Signal ground reference | Separate from PGND to minimize noise coupling into sensitive analog circuitry. |
| PLLLPF (7) | PLL low-pass filter / oscillator control | Voltage setting (0V→300kHz, floating→550kHz, ≥2.4V→750kHz); critical for synchronization stability. |
| SENSE1+ / SENSE2+ (9, 16) | Differential current sense (+) & PVIN supply | Connects to high-side of sense resistor and powers gate drivers - must be decoupled locally. |
| EXTCLK/MODE (10) | External clock input / burst mode select | Pull low for pulse-skipping; tie to VIN for Burst Mode®; apply 300–750kHz clock for PLL sync. |
| PGOOD (11) | Open-drain power-good indicator | Asserts low if either VFB deviates >±8% or channel 1 is disabled - used for system enable sequencing. |
| PGATE1 / PGATE2 (12, 14) | P-channel MOSFET gate drivers | 0–PVIN swing; 1A peak drive strength supports fast turn-on of logic-level P-MOSFETs. |
| PGND (13) | Power ground for gate drivers | High-current return path for gate drive loops - requires separate low-impedance trace to SENSE–. |
| VIN (15) | IC bias supply input | Powers internal circuitry (excluding gate drivers); must be filtered separately from PVIN paths. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input capacitor RMS current by ~50% vs single-phase - cuts EMI, improves efficiency, and allows smaller input bulk caps. |
| True PLL synchronization | Enables precise frequency locking to external clocks (300–750kHz) while maintaining 180° phase offset between channels. |
| Independent per-channel soft-start | 2048-cycle ramp with 4-step current limiting (0%/25%/50%/75% of full scale) prevents inrush and ensures controlled startup. |
| Dropout-ready 100% duty cycle | Extends regulation down to VIN ≈ VOUT + losses - critical for battery-powered systems nearing end-of-discharge. |
| Integrated protection suite | Includes output overvoltage (0.88V trip), short-circuit frequency foldback (to 1/5 normal freq), and undervoltage lockout (2.00V rising). |
Applications
| Notebook Power Rails | Handheld Device Core Supply |
|---|---|
Use Scenario: Dual-output power management for CPU core (1.8V/2A) and I/O (2.5V/2A) in ultra-thin notebooks with single-cell Li-ion battery input (2.5–4.2V). IC Role / Device Role / Timing Role: 2-phase dual step-down controller providing interleaved regulation, synchronized switching, and PGOOD sequencing for SoC power-up. Use Value: Cuts input ripple current by 53% (0.91ARMS vs 1.79ARMS), reducing required input capacitance and EMI filtering cost. |
Use Scenario: High-efficiency dual-rail supply for ARM-based handhelds with dynamic load profiles (0–2A per rail) and strict battery-life requirements. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with selectable Burst Mode® for light-load efficiency optimization and PWM pulse-skipping for low-noise audio subsystems. Use Value: Achieves >85% efficiency at 10mA load via Burst Mode®, while maintaining <20mV output ripple in pulse-skipping mode. |
| Portable Instrument ADC/DAC Supply | Distributed DC Power System |
Use Scenario: Low-noise, tightly regulated dual supply (±1.8V or 3.3V/1.2V) for precision data acquisition modules powered from 3.3V or 5V intermediate bus. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller with independent VFB inputs and PGOOD monitoring for isolated analog/digital domain power domains. Use Value: 0.8V ±2% reference and ±8% PGOOD window ensure stable reference integrity and reliable system reset signaling. |
Use Scenario: Distributed point-of-load regulation in industrial handheld test equipment requiring redundant 2.5V/1.8V rails from a shared 5V or 12V backplane. IC Role / Device Role / Timing Role: Interleaved dual controller enabling shared input filtering, thermal load balancing, and coordinated power-good assertion across multiple subsystems. Use Value: Out-of-phase operation reduces total input RMS current by factor of √2 - lowers heat generation in shared input traces and connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3728IG | Single-phase dual-controller (not interleaved); no PLL sync; 600kHz fixed frequency; requires external slope compensation. | Lacks 2-phase current interleaving benefit - higher input RMS current and EMI; suitable only when layout space permits larger input caps. | Select LTC3728IG only if interleaving is unnecessary and fixed-frequency simplicity is prioritized over efficiency/EMI. |
| MP2918GL-Z | Monolithic dual-phase buck controller (integrated MOSFETs); 300–1MHz programmable frequency; no P-channel support; lower VIN min (4.5V). | Cannot operate below 4.5V input - incompatible with single-cell Li-ion; eliminates external FETs but limits thermal design flexibility. | Choose MP2918GL-Z for 5V/12V intermediate bus applications where integration outweighs low-VIN capability. |
Compared with LTC3728IG and MP2918GL-Z, the LTC3701EGN#PBF uniquely supports true 2-phase interleaving down to 2.5V input with P-channel MOSFETs, enabling superior efficiency and EMI performance in battery-powered portable systems - a capability neither alternative matches.
Availability
LTC3701EGN#PBF is available at Aetrix Electronics and suitable for notebook computers, handheld medical instruments, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to 85°C) performance.
Supply support for LTC3701EGN#PBF 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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The LTC3701EGN#PBF belongs to Linear's legacy high-efficiency DC/DC controller product line, specifically engineered for low-input-voltage, dual-rail, portable power applications where input capacitance minimization and battery runtime optimization are critical design goals.
FAQ
What is the minimum input voltage supported by the LTC3701EGN#PBF?
The LTC3701EGN#PBF supports a minimum input voltage of 2.5V, enabling direct operation from single-cell lithium-ion batteries across their full discharge range. Its undervoltage lockout (UVLO) has a rising threshold of 2.12V (typical), ensuring reliable startup and shutdown behavior near battery cutoff. Below 2.5V, the device ceases regulation but remains within absolute maximum ratings down to –0.3V.
Does the LTC3701EGN#PBF support synchronization to an external clock source?
Yes, the LTC3701EGN#PBF supports full PLL-based synchronization via the EXTCLK/MODE pin, accepting external clock signals from 300kHz to 750kHz. When locked, it maintains precise 180° phase offset between its two channels and disables Burst Mode® operation - ensuring deterministic timing for noise-sensitive systems like audio or RF subsystems.
How does the LTC3701EGN#PBF handle dropout conditions?
The LTC3701EGN#PBF supports 100% duty cycle operation, allowing the external P-channel MOSFET to remain continuously on when input voltage approaches the output voltage. In this state, regulation is maintained by the MOSFET's RDS(ON), sense resistor, and inductor DCR - extending usable battery life beyond conventional buck controllers limited to <95% duty cycle.
What protection features are integrated into the LTC3701EGN#PBF?
The LTC3701EGN#PBF integrates output overvoltage protection (trip at 0.88V on VFB), short-circuit protection (frequency foldback to 1/5 normal rate), undervoltage lockout (2.00V rising threshold), and PGOOD monitoring (±8% window). It also includes internal soft-start current limiting and gate driver peak-current protection - eliminating need for external fault-handling circuitry.
Can the LTC3701EGN#PBF be used with N-channel MOSFETs?
No, the LTC3701EGN#PBF is specifically designed for external P-channel MOSFETs, as indicated by its PGATE1/PGATE2 outputs that swing from 0V to SENSE+/PVIN. Its gate drive architecture lacks high-side bootstrap or charge-pump circuitry required for N-channel high-side switches. Using N-channel devices would require redesigning the power stage and is not supported by the controller's timing or drive characteristics.
LTC3701EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 2.5V ~ 10V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3701EGN#PBF FAQ
1.How can I place an order for LTC3701EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3701EGN#PBF 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 LTC3701EGN#PBF reliable?
The price and inventory of LTC3701EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3701EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3701EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3701EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3701EGN#PBF?
LTC3701EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3701EGN#PBF 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 LTC3701EGN#PBF?
For technical support, including LTC3701EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3701EGN#PBF requirements.
6.How does Aetrix verify that LTC3701EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3701EGN#PBF 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 LTC3701EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3701EGN#PBF?
All LTC3701EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3701EGN#PBF, 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 LTC3701EGN#PBF part is unused and in its original packaging.
Return procedure for LTC3701EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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