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Analog Devices Inc. LTC3701EGN#TRPBF
- Part No.:
- LTC3701EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3701EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,721
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Product details
Overview
LTC3701EGN#TRPBF from Analog Devices (formerly Linear Technology) is a 2-phase, dual constant-frequency current-mode step-down DC/DC controller designed for low-input-voltage systems. It delivers precise 0.8V ±2% reference regulation, operates from 2.5V to 10V input, supports 550kHz nominal switching (adjustable 300–750kHz), and enables 100% duty-cycle dropout operation with external P-channel MOSFETs-ideal for lithium-ion-powered portable computing and instrumentation.
For engineers reviewing the LTC3701EGN#TRPBF datasheet, LTC3701EGN#TRPBF pinout, LTC3701EGN#TRPBF application, or LTC3701EGN#TRPBF equivalent, key selection considerations include out-of-phase interleaving for reduced input RMS current, PLL-based synchronization capability, independent soft-start per channel, PGOOD monitoring with ±8% window, and verified short-circuit protection at 1/5 frequency reduction.
Technical Context
The LTC3701EGN#TRPBF implements two independent current-mode control loops operating 180° out of phase, each using an error amplifier with ITH/RUN compensation node and differential current sensing (SENSE+ / SENSE−). Its voltage-controlled oscillator supports internal 550kHz operation or external PLL synchronization via EXTCLK/MODE, with frequency tuning through PLLLPF voltage (0V → 300kHz, floating → 550kHz, ≥2.4V → 750kHz).
Each channel features dedicated VFB feedback inputs referenced to a trimmed 0.8V bandgap, independent shutdown via ITH/RUN < 0.35V, and integrated protections including output overvoltage (0.835–0.930V trip), short-circuit (reduced switching frequency), and undervoltage lockout (1.55–2.55V falling threshold). The device uses P-channel high-side gate drivers (PGATE1/PGATE2) with 1A peak sink/source capability and 40ns rise/fall times into 3000pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 10V - supports single- or dual-cell Li-ion battery input without pre-regulation |
| Reference Voltage | 0.8V ±2% - enables accurate output regulation across –40°C to 85°C ambient |
| Switching Frequency | 300kHz to 750kHz - adjustable via PLLLPF voltage; 550kHz nominal minimizes inductor size |
| Quiescent Current | 460µA typical - extends battery life in always-on portable systems |
| Current Sense Threshold | 95mV to 145mV - sets peak inductor current with duty-cycle-dependent slope compensation |
| PGOOD Accuracy | ±8% window on VFB - provides reliable power-good signaling for system sequencing |
| Operating Temperature | –40°C to 85°C - qualified for industrial and embedded portable environments |
| Package | 16-lead narrow SSOP - compact footprint compatible with high-density PCB layouts |
Pinout & Package
The LTC3701EGN#TRPBF is housed in a 16-lead narrow plastic SSOP package (GN) with exposed pad thermal enhancement. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1– (1) | Differential current sense (–) | Connects to low-side of RSENSE1; used with SENSE1+ to set channel 1 peak current |
| ITH/RUN1 (2) | Error amp output & run control | Compensation node for channel 1; <0.35V disables channel 1; internal 0.5µA soft-start charge source |
| VFB1 (3) | Channel 1 feedback input | Monitors output divider voltage; compared to 0.8V reference for regulation |
| SGND (4) | Signal ground reference | Return path for analog circuitry; must be separated from PGND for noise immunity |
| VFB2 (5) | Channel 2 feedback input | Independent regulation loop input for second output rail |
| ITH/RUN2 (6) | Error amp output & run control | Compensation node for channel 2; identical function and thresholds as ITH/RUN1 |
| PLLLPF (7) | PLL low-pass filter & freq. control | Sets oscillator frequency: 0V→300kHz, floating→550kHz, ≥2.4V→750kHz; accepts RC filter for sync |
| SENSE2– (8) | Differential current sense (–) | Low-side connection for RSENSE2; pairs with SENSE2+ for channel 2 current limit |
| SENSE1+ (16) | Differential current sense (+) & PVIN1 | High-side RSENSE1 connection and local supply for PGATE1 driver |
| VIN (15) | IC signal power supply | Powers internal logic, references, and comparators; separate from gate drive supplies |
| PGATE1 (14) | Channel 1 P-MOSFET gate driver | 0–SENSE1+ swing; 1A peak drive supports fast turn-on of low-RDS(ON) P-FETs |
| PGND (13) | Power ground for gate drivers | Return for PGATE1/PGATE2; must be low-inductance path to minimize switching noise |
| PGATE2 (12) | Channel 2 P-MOSFET gate driver | 0–SENSE2+ swing; independent timing and drive strength from PGATE1 |
| PGOOD (11) | Open-drain power-good monitor | Pulled low if either VFB1 or VFB2 deviates >±8% from 0.8V or if channel 1 is disabled |
| EXTCLK/MODE (10) | External clock input & mode select | Enables PLL sync (300–750kHz); low = pulse-skipping, high = Burst Mode, floating = internal osc |
| SENSE2+ (9) | Differential current sense (+) & PVIN2 | High-side RSENSE2 connection and local supply for PGATE2 driver |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase 2-phase operation | Reduces input capacitor RMS current by ~49% vs single-phase, lowering EMI and enabling smaller, cheaper input caps |
| True PLL synchronization | Allows precise frequency locking to external clocks or fine-tuning across 300–750kHz without jitter accumulation |
| Independent per-channel soft-start | 2048-cycle ramp clamps peak current to 0%, 25%, 50%, then 75% of full scale-prevents inrush and ensures controlled startup |
| 100% duty-cycle dropout mode | Maintains regulation down to VIN ≈ VOUT by holding P-MOSFET fully on-critical for battery end-of-discharge operation |
| Output overvoltage protection | Turns off external MOSFET when VFB exceeds 0.835–0.930V; 20mV hysteresis prevents chatter during transients |
| Selectable light-load operation | Burst Mode (EXTCLK/MODE = VIN) maximizes efficiency at light loads; pulse-skipping (EXTCLK/MODE = GND) reduces ripple/noise |
Applications
| Notebook and Handheld Computers | Portable Instruments |
|---|---|
Use Scenario: Dual-rail power delivery for CPU core (1.8V/2A) and I/O (2.5V/2A) from single Li-ion battery (2.5–9.8V). IC Role / Device Role / Timing Role: 2-phase synchronous buck controller providing interleaved regulation with shared input capacitance and independent feedback loops. Use Value: Reduces input RMS current from 1.79A to 0.91A-cutting input cap cost by ~40% and improving real-world efficiency by factor of 3.86 in conduction loss. | Use Scenario: Precision analog front-end and microcontroller supply in handheld test equipment powered by 2-cell Li-ion. IC Role / Device Role / Timing Role: Dual-output DC/DC controller delivering stable, low-noise rails with PGOOD sequencing and ±8% output monitoring. Use Value: Enables battery-life extension via 460µA quiescent current and 100% duty-cycle dropout-maintaining 1.8V output until battery drops below 2.0V. |
| Personal Digital Assistants | Distributed DC Power Systems |
Use Scenario: Compact, low-profile power solution for legacy PDA platforms requiring multiple regulated outputs from limited board area. IC Role / Device Role / Timing Role: Dual-channel step-down controller in 16-lead narrow SSOP, supporting independent enable/disable and soft-start per rail. Use Value: Eliminates need for two discrete controllers-reducing BOM count, layout complexity, and total solution footprint by >35%. | Use Scenario: Local point-of-load regulation in modular industrial systems where centralized 12V or 5V bus feeds distributed subsystems. IC Role / Device Role / Timing Role: Interleaved buck controller converting intermediate bus to lower-voltage rails with synchronized switching to minimize bus ripple. Use Value: Enables clean, low-EMI power conversion without external synchronization IC-reducing component count and layout sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855IGN#TRPBF | Supports N-channel MOSFETs with bootstrap gate drive; wider VIN range (4.5–38V); no built-in 0.8V reference (requires external resistor divider) | Targeted at higher-input industrial/automotive systems; lacks P-channel dropout optimization for Li-ion | Choose LTC3855IGN#TRPBF only when N-MOSFET topology and >4.5V input are required; not drop-in for LTC3701EGN#TRPBF's low-VIN P-MOSFET use case |
| MP2918GL-Z | Single-chip dual-phase controller with integrated N-MOSFET drivers; fixed 600kHz frequency; no PLL sync or adjustable frequency | Designed for cost-sensitive consumer electronics; lacks independent channel shutdown and soft-start | Consider MP2918GL-Z for simplified, lower-cost designs where independent control and wide frequency tuning are not needed |
Compared with LTC3855IGN#TRPBF and MP2918GL-Z, the LTC3701EGN#TRPBF uniquely combines P-channel compatibility for ultra-low-VIN operation, true PLL synchronization, and per-channel soft-start-making it the only option validated for battery-powered portable systems requiring 100% duty-cycle dropout and precise dual-rail sequencing.
Availability
LTC3701EGN#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and personal digital assistants requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3701EGN#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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3701EGN#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC controllers, engineered specifically for space-constrained, battery-powered portable electronics demanding low quiescent current, precise regulation, and robust protection.
FAQ
What is the minimum input voltage supported by the LTC3701EGN#TRPBF?
The LTC3701EGN#TRPBF supports a minimum input voltage of 2.5V, verified by its absolute maximum rating (–0.3V to 10V) and operational specification (2.5V to 10V). This enables direct operation from single-cell Li-ion batteries down to end-of-discharge, and the device maintains regulation via 100% duty-cycle dropout mode when VIN approaches VOUT.
Does the LTC3701EGN#TRPBF support external frequency synchronization?
Yes, the LTC3701EGN#TRPBF supports true PLL-based external synchronization via the EXTCLK/MODE pin, locking to external clocks between 300kHz and 750kHz. When synchronized, Burst Mode is disabled and the device operates in pulse-skipping mode, maintaining low output ripple and RF interference while allowing precise system-level timing alignment.
How does the LTC3701EGN#TRPBF implement short-circuit protection?
The LTC3701EGN#TRPBF detects short circuits when VFB drops below 0.3V, reducing the affected channel's switching frequency to 1/5 of normal to safely discharge inductor current and prevent runaway. The unaffected channel continues normal operation. This behavior is confirmed in the Functional Diagram and Electrical Characteristics table under "Short-Circuit Protection" section.
What is the purpose of the PLLLPF pin on the LTC3701EGN#TRPBF?
The PLLLPF pin on the LTC3701EGN#TRPBF serves dual functions: it acts as the low-pass filter node for the internal phase-locked loop and as the voltage control input for the oscillator. Applying 0V selects 300kHz, floating selects 550kHz, and ≥2.4V selects 750kHz-enabling precise frequency setting without external components in non-synchronized applications.
Can the LTC3701EGN#TRPBF operate with only one channel enabled?
Yes, the LTC3701EGN#TRPBF supports independent channel enable/disable via the ITH/RUN1 and ITH/RUN2 pins. Pulling either pin below 0.35V disables its respective channel while the other remains fully functional-including independent soft-start, regulation, and protection-verified in the "Main Control Loop" and "Functional Diagram" sections of the datasheet.
LTC3701EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3701EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3701EGN#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 LTC3701EGN#TRPBF reliable?
The price and inventory of LTC3701EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3701EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3701EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3701EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3701EGN#TRPBF?
LTC3701EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3701EGN#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 LTC3701EGN#TRPBF?
For technical support, including LTC3701EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3701EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3701EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3701EGN#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 LTC3701EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3701EGN#TRPBF?
All LTC3701EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3701EGN#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 LTC3701EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3701EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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