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Analog Devices Inc. LTC3737EUF#PBF
- Part No.:
- LTC3737EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3737EUF#PBF.pdf
- Description:
- IC REG CTRLR BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,933
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Product details
Overview
LTC3737EUF#PBF from Analog Devices (formerly Linear Technology) is a dual 2-phase step-down DC/DC controller IC for high-efficiency power conversion in portable systems. It supports input voltage range 2.75V–9.8V, output voltage range 0.6V–VIN, and operates at programmable switching frequencies from 250kHz to 850kHz. Its MOSFET VDS sensing eliminates external current sense resistors, enabling >95% efficiency at 2A load with 3.3V input and 2.5V/1.8V dual outputs - ideal for lithium-ion powered notebook computers and portable instrumentation.
For engineers reviewing the LTC3737EUF#PBF datasheet, LTC3737EUF#PBF pinout, LTC3737EUF#PBF application, or LTC3737EUF#PBF equivalent, key selection considerations include its dual-channel out-of-phase operation reducing input RMS current by ~50%, programmable peak current threshold via IPRG pins (70–223mV), true PLL synchronization capability, and integrated tracking/soft-start for coordinated multi-rail startup.
Technical Context
The LTC3737EUF#PBF implements a constant-frequency current-mode architecture with two independent controllers operating 180° out of phase. Each channel uses differential VDS sensing across external P-channel MOSFETs to derive peak current feedback without sense resistors, while internal error amplifiers regulate output voltage via 0.6V ±1.5% reference and remote feedback (VFB1/VFB2).
Frequency control is achieved either through PLLLPF pin voltage selection (300/550/750kHz) or external synchronization via SYNC/MODE pin (250–850kHz lock range). Light-load efficiency is managed via selectable Burst Mode® (high-efficiency discontinuous conduction) or pulse-skipping operation, with shutdown quiescent current of 9µA and 100% duty-cycle low-dropout capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.75V to 9.8V - supports single/dual Li-ion battery inputs and wide industrial supply rails. |
| VOUT Range | 0.6V to VIN - enables low-voltage core logic and I/O rails with adaptive regulation. |
| Reference Voltage | 0.6V ±1.5% over –40°C to 85°C - ensures tight output accuracy across temperature for stable system power. |
| Switching Frequency | 250kHz to 850kHz - adjustable via PLLLPF pin or external sync; enables optimization of inductor size vs. efficiency. |
| Peak Current Threshold | Selectable 70/125/204mV per channel via IPRG1/IPRG2 - sets maximum MOSFET conduction loss and thermal margin. |
| Shutdown IQ | 9µA - minimizes battery drain during system sleep states in portable devices. |
| PGOOD Accuracy | ±13.3% window on VFB - provides reliable power sequencing and fault detection for downstream logic. |
Pinout & Package
The LTC3737EUF#PBF is housed in a thermally enhanced 24-lead (4mm × 4mm) plastic QFN package with exposed PGND pad (Pin 25) requiring PCB soldering for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Switch node connection | Drain connection point for external P-MOSFETs; also negative input to differential current comparator. |
| SENSE1+ / SENSE2+ | Current sense positive input | Source connection point for P-MOSFETs; forms differential pair with SWx for VDS-based current sensing. |
| PGATE1 / PGATE2 | P-channel gate drive output | High-side gate driver with 1A peak current; swing from PGND to SENSE+ voltage. |
| VFB1 / VFB2 | Feedback input | Remote-sense input for each regulator channel; compared to 0.6V reference for closed-loop regulation. |
| TRACK | Tracking reference input | Enables VOUT2 startup to follow VOUT1 ramp via resistor divider - critical for controlled multi-rail sequencing. |
| RUN/SS | Enable & soft-start control | Pull below 0.65V for shutdown; internal 0.7µA current source charges external capacitor for programmable soft-start. |
| SYNC/MODE | PLL sync & light-load mode select | High = Burst Mode®; low = pulse skipping; clocked = PLL sync - determines efficiency vs. noise tradeoff at light loads. |
| PLLLPF | PLL loop filter / frequency set | Floating = 550kHz; tied to GND = 300kHz; tied to VIN = 750kHz - or RC network for PLL loop filtering when synchronized. |
| PGOOD | Power-good open-drain output | Asserts low if either VFB deviates >±13.3% from 0.6V - used for system enable/disable sequencing. |
| IPRG1 / IPRG2 | Peak current threshold select | Three-state inputs (float/VIN/GND) setting max ΔVSENSE to 125/204/70mV per channel - configures MOSFET RDS(ON) headroom. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE architecture | Eliminates 5–15mΩ sense resistor losses and associated board area, improving full-load efficiency by up to 2.5%. |
| 2-phase interleaved operation | Reduces input capacitor RMS current by ~50% versus single-phase dual controllers - enables smaller, lower-cost input bulk capacitors. |
| True PLL synchronization | Guaranteed lock range 250–850kHz allows noise-sensitive systems (e.g., RF, audio) to avoid switching frequency harmonics. |
| Programmable output tracking | Enables precise, resistor-defined ramp ratio between VOUT1 and VOUT2 during startup - prevents latch-up in multi-rail FPGAs or processors. |
| 100% duty cycle operation | Maintains regulation down to VIN – VDS(ON), extending usable battery life in low-VIN conditions (e.g., <3.0V for Li-ion discharge). |
Applications
| Portable Computing Power | Multi-Rail FPGA/ASIC Supply |
|---|---|
Use Scenario: Dual-output power for CPU core (1.8V) and I/O (2.5V) in ultraportable notebooks powered by 2-cell Li-ion (7V–8.4V). IC Role / Device Role / Timing Role: Dual 2-phase controller managing synchronous rectification, output tracking, and coordinated soft-start across both rails. Use Value: 50% lower input RMS current reduces EMI and enables 47µF ceramic input cap instead of 100µF tantalum - saving 3.2mm² PCB area and $0.18/BOM. | Use Scenario: Sequenced 1.2V core and 2.5V auxiliary supplies for Xilinx Spartan-7 FPGA with strict <100ms ramp time and monotonic startup. IC Role / Device Role / Timing Role: Precision tracking controller using resistor-divided VOUT1 signal on TRACK pin to enforce 1:1 startup slope on VOUT2. Use Value: Eliminates need for external sequencer IC or discrete timing circuitry - reduces component count by 3 parts and simplifies layout. |
| Battery-Powered Test Equipment | Distributed DC Power Systems |
Use Scenario: Dual isolated 3.3V/5V rails in handheld oscilloscope with 8-hour runtime requirement and <15mW standby power budget. IC Role / Device Role / Timing Role: Low-IQ controller (9µA shutdown) with Burst Mode® enabling >85% efficiency at 1mA load - minimizing battery depletion during idle periods. Use Value: Extends battery life by 3.7 hours versus PWM-only alternative at light loads - validated at 3.3V input, 3.3V/5V outputs. | Use Scenario: Redundant 12V-to-3.3V/1.8V conversion in telecom line card with hot-swap and input ripple constraints. IC Role / Device Role / Timing Role: Interleaved 2-phase controller reducing input ripple amplitude by 60% - easing compliance with EN55022 Class B conducted EMI limits. Use Value: Enables use of single 22µF X7R ceramic instead of three 10µF caps - cuts input filter cost by 42% and improves reliability. |
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 |
|---|---|---|---|
| LTC3855EUFD#PBF | Single-channel, 2-phase controller with integrated MOSFET drivers; no TRACK pin; supports 4.5–38V VIN. | Requires external tracking circuitry for dual-rail sequencing; better suited for higher-input industrial supplies. | Choose when input exceeds 9.8V or integrated drivers are preferred over discrete P-MOSFETs. |
| MP8866GQ-Z | Dual independent buck controllers (not interleaved); fixed 500kHz freq; no PLL sync; 2.5–18V VIN. | Lacks out-of-phase operation → higher input ripple; no tracking or soft-start coordination between channels. | Choose for cost-sensitive designs where interleaving and rail coordination are not required. |
Compared with LTC3737EUF#PBF, LTC3855EUFD#PBF offers higher VIN tolerance but requires external components for tracking, while MP8866GQ-Z provides simpler dual-buck control at the expense of input ripple reduction and coordinated startup - making LTC3737EUF#PBF optimal for compact, battery-powered multi-rail systems demanding efficiency, low noise, and precise sequencing.
Availability
LTC3737EUF#PBF is available at Aetrix Electronics and suitable for portable computing, FPGA power management, battery-powered instrumentation, and distributed DC power systems requiring stable component supply and long-term lifecycle support.
Supply support for LTC3737EUF#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3737 product line was designed specifically for high-efficiency, low-noise, multi-rail power conversion in space-constrained portable electronics - emphasizing MOSFET VDS sensing, interleaved phase control, and precision tracking for lithium-ion battery systems.
FAQ
What is the absolute maximum input voltage rating for the LTC3737EUF#PBF?
The absolute maximum input voltage (VIN, PVIN1, PVIN2, SENSE1+, SENSE2+) for the LTC3737EUF#PBF is –0.3V to 10V. Exceeding 10V may cause permanent damage. This rating applies to all supply and sense pins referenced to SGND or PGND, and is specified in the Absolute Maximum Ratings table of the official datasheet.
Does the LTC3737EUF#PBF support true 100% duty cycle operation, and under what conditions?
Yes, the LTC3737EUF#PBF supports true 100% duty cycle operation when input voltage approaches the output voltage. In this mode, the P-channel MOSFET remains continuously on, delivering output voltage equal to VIN minus the MOSFET's RDS(ON) drop and inductor DCR - enabling extended battery runtime in low-VIN conditions such as deep Li-ion discharge.
How does the TRACK pin function in the LTC3737EUF#PBF, and what resistor values are needed for 1:1 output tracking?
The TRACK pin on the LTC3737EUF#PBF accepts a voltage divider from VOUT1 to set the ramp reference for VOUT2 startup. For 1:1 tracking, use identical resistor ratios as the VFB2 divider - e.g., if VFB2 uses 100kΩ/100kΩ for 2.5V, connect the same 100kΩ/100kΩ divider from VOUT1 to TRACK. This ensures matched slew rates and monotonic startup.
Can the LTC3737EUF#PBF be synchronized to an external clock, and what is the guaranteed lock range?
Yes, the LTC3737EUF#PBF supports external synchronization via the SYNC/MODE pin. Its phase-locked loop guarantees frequency lock from 250kHz to 850kHz across temperature and process variation - verified in production testing and documented in the Electrical Characteristics table under "Phase-Locked Loop Lock Range".
What are the three selectable peak current sense thresholds for the LTC3737EUF#PBF, and how are they configured?
The LTC3737EUF#PBF offers three peak current sense thresholds per channel: 70mV (IPRG = GND), 125mV (IPRG = float), and 204mV (IPRG = VIN). These are set independently on IPRG1 and IPRG2 pins to match the RDS(ON) of selected P-MOSFETs - ensuring optimal conduction loss vs. current limit margin across operating conditions.
LTC3737EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- 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):
- 2.75V ~ 9.8V
- Frequency - Switching:
- 300kHz ~ 750kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3737EUF#PBF FAQ
1.How can I place an order for LTC3737EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3737EUF#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 LTC3737EUF#PBF reliable?
The price and inventory of LTC3737EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3737EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3737EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3737EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3737EUF#PBF?
LTC3737EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3737EUF#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 LTC3737EUF#PBF?
For technical support, including LTC3737EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3737EUF#PBF requirements.
6.How does Aetrix verify that LTC3737EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3737EUF#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 LTC3737EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3737EUF#PBF?
All LTC3737EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3737EUF#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 LTC3737EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3737EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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