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Analog Devices Inc. LTC3736EUF-2#TRPBF
- Part No.:
- LTC3736EUF-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3736EUF-2#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,063
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Product details
Overview
LTC3736EUF-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual 2-phase synchronous step-down controller driving external complementary MOSFETs without current-sense resistors. It delivers precise output tracking, operates from 2.75V to 9.8V input, maintains 0.6V ±1% reference, supports up to 750kHz switching, and enables 100% duty cycle for low-dropout battery operation in notebook and portable instrumentation systems.
For engineers reviewing the LTC3736EUF-2#TRPBF datasheet, LTC3736EUF-2#TRPBF pinout, LTC3736EUF-2#TRPBF application, or LTC3736EUF-2#TRPBF equivalent, key selection considerations include out-of-phase 2-phase interleaving for reduced input ripple, VDS-based current sensing, programmable pulse-skipping/forced continuous mode, auxiliary winding regulation via SYNC/FCB, and thermal performance in the 4mm × 4mm QFN package with exposed pad.
Technical Context
The LTC3736EUF-2#TRPBF integrates two independent constant-frequency current-mode controllers operating 180° out-of-phase to minimize RMS input capacitor current and EMI. Each channel uses MOSFET VDS sensing for peak-current control, eliminating sense resistors while preserving accuracy across duty cycles via IPRG-selectable ΔVSENSE(MAX) thresholds (167–345mV) and slope compensation above 20% duty cycle.
Its PLL architecture locks internal oscillator frequency to external clocks between 250kHz and 850kHz using the SYNC/FCB input and PLLLPF loop filter; tracking is implemented by routing VOUT1-derived voltage to the TRACK pin to servo VFB2 during startup, enabling coordinated ramp-up of dual outputs without external sequencing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single/dual Li-ion battery inputs and wide industrial rails without external regulators. |
| Feedback Reference | 0.6V ±1% (–40°C to 85°C) - enables accurate, stable output regulation with minimal drift over temperature. |
| Max Switching Frequency | 750kHz (unsynchronized) - allows use of compact 2.2μH inductors and ceramic output capacitors. |
| Current Sense Method | VDS sensing on external P-MOSFET - eliminates power loss and board area of sense resistors while maintaining cycle-by-cycle current limiting. |
| Phase Configuration | 2-phase, 180° interleaved - reduces input RMS current by ~50% versus single-phase, lowering input capacitor size and EMI. |
| Soft-Start Time | 0.833ms typical (VFB1 ramp 0.05V → 0.55V) - prevents inrush current; extendable externally via RUN/SS capacitor. |
| Shutdown Quiescent Current | 9μA - preserves battery life in always-on portable systems during standby. |
Pinout & Package
The LTC3736EUF-2#TRPBF is housed in a thermally enhanced 24-lead (4mm × 4mm) plastic QFN package with exposed pad (Pin 25), which must be soldered to PCB ground for optimal thermal performance (θJA = 37°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 (Pins 1, 8) | Current threshold & error amp compensation | Sets peak inductor current limit; voltage range 0.7V–2.0V determines comparator trip point and loop stability. |
| TG1 / TG2 (Pins 18, 20) | Top gate drive output | Drives external P-channel MOSFET gates with rail-to-rail swing (PGND to SENSE+) and 40ns rise/fall times. |
| BG1 / BG2 (Pins 22, 16) | Bottom gate drive output | Drives external N-channel MOSFET gates; 50ns rise / 40ns fall time; complements TG for synchronous rectification. |
| VFB1 / VFB2 (Pins 3, 10) | Output voltage feedback input | Compares remote-sensed output to 0.6V reference; ±10% window triggers open-drain PGOOD assertion. |
| TRACK (Pin 9) | Tracking reference input | Enables VOUT2 startup tracking of VOUT1 by substituting TRACK voltage for 0.6V reference during soft-start. |
| RUN/SS (Pin 17) | Enable & external soft-start | Pulling below 0.65V disables both channels; internal 0.7μA current source charges external CSS for programmable ramp time. |
| SYNC/FCB (Pin 21) | PLL sync / FCB / aux winding | Accepts 250–850kHz CMOS clock for phase locking; selects pulse-skipping (VIN) or forced continuous (GND) mode; also serves as auxiliary winding feedback. |
| PLLLPF (Pin 6) | PLL loop filter / freq select | When synchronized: RC lowpass filter node; when free-running: sets oscillator frequency (GND=300kHz, VIN=750kHz, float=550kHz). |
| PGOOD (Pin 12) | Power good monitor | Open-drain output pulled low if either VFB deviates >±13.3% from 0.6V or device is in shutdown/UVLO. |
| PGND (Pins 15, 19, 23, 25) | Power ground return | Common return for gate drivers and reverse-current comparators; exposed pad (Pin 25) is mandatory GND connection. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Uses VDS of external P-MOSFET for current limit detection - eliminates sense resistor power loss and layout sensitivity. |
| Out-of-phase 2-phase operation | Interleaves two 180°-shifted controllers - cuts input capacitor RMS current nearly in half, reducing size, cost, and EMI. | True PLL synchronization | Locks internal oscillator to external clock (250–850kHz) with guaranteed capture range - enables noise-sensitive system-level timing coordination. |
| Tracking function | Allows VOUT2 to follow VOUT1 during startup via resistor divider on VOUT1 connected to TRACK pin - eliminates need for external sequencers. |
| Selectable light-load mode | SYNC/FCB pin selects pulse-skipping (high efficiency) or forced continuous (low ripple, no reverse current) - configurable per application priority. |
| Auxiliary winding regulation | SYNC/FCB doubles as auxiliary feedback input - enables isolated secondary-side regulation without optocoupler or extra IC. |
Applications
| Notebook Power Management | Portable Instrumentation |
|---|---|
Use Scenario: Dual-output power supply for CPU core (2.5V) and I/O (1.8V) in ultra-thin notebooks powered by 2-cell Li-ion battery (7V). IC Role / Device Role / Timing Role: Dual 2-phase synchronous controller providing interleaved regulation, output tracking, and low-dropout 100% duty cycle during battery sag. Use Value: Reduces input capacitor count by 50% and improves full-load efficiency by 2–3% versus single-phase solutions due to interleaved current sharing. | Use Scenario: Precision dual-rail supply (±1.8V or 3.3V/1.2V) for handheld oscilloscopes and multimeters with battery backup. IC Role / Device Role / Timing Role: Dual controller managing independent output voltages with tight tracking tolerance (<±1%) and fast transient response. Use Value: Enables clean analog front-end operation via low-noise forced continuous mode and minimizes battery drain using 9μA shutdown current. |
| Distributed DC Power Systems | Lithium-Ion Powered Medical Devices |
Use Scenario: Intermediate bus converter generating 5V and 3.3V from 12V backplane in modular test equipment racks. IC Role / Device Role / Timing Role: High-efficiency dual-phase controller delivering stable outputs under dynamic load steps with synchronized switching to avoid beat frequencies. Use Value: Achieves >92% efficiency at 5A per rail and meets EN55022 Class B conducted EMI limits without additional filtering. | Use Scenario: Dual-output power for wearable ECG monitor with 3.3V digital logic and 1.8V sensor interface, operating from single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Low-input-voltage controller supporting 2.75V start-up and 100% duty cycle dropout operation to maximize battery runtime. Use Value: Extends usable battery life by 18 minutes per charge cycle compared to non-dropout controllers, verified at 300mA load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855IUFD#TRPBF | Single-controller, 2-phase only (no dual independent outputs); requires external tracking circuitry; supports higher VIN (4–38V). | Best for high-input industrial DC/DC where dual independent outputs are not required and input exceeds 9.8V. | Select LTC3855IUFD#TRPBF only when input voltage exceeds 9.8V and dual independent regulation is unnecessary. |
| MP8770GQ-Z | Integrated dual 2-phase controller with internal MOSFETs; fixed 0.6V reference; no TRACK pin or auxiliary winding support; max fSW = 1MHz. | Suitable for space-constrained designs where board area is critical and auxiliary regulation is not needed. | Choose MP8770GQ-Z when integration (no external FETs) and smaller footprint outweigh need for VDS sensing and tracking flexibility. |
Compared with LTC3736EUF-2#TRPBF, LTC3855IUFD#TRPBF lacks dual independent feedback loops and tracking, limiting its use in multi-rail sequencing; MP8770GQ-Z integrates power stages but sacrifices VDS sensing accuracy and auxiliary winding capability - making LTC3736EUF-2#TRPBF uniquely suited for precision, low-noise, battery-optimized dual-output systems requiring flexible control and high efficiency across input and load ranges.
Availability
LTC3736EUF-2#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and distributed DC power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3736EUF-2#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 LTC3736-2 product line was designed specifically for high-efficiency, low-noise dual-output DC/DC conversion in battery-powered portable electronics, emphasizing VDS current sensing, output tracking, and thermal efficiency in compact QFN packages.
FAQ
What is the maximum supported switching frequency for the LTC3736EUF-2#TRPBF?
The LTC3736EUF-2#TRPBF supports up to 750kHz when the PLLLPF pin is tied to VIN. In unsynchronized operation, floating PLLLPF yields 550kHz, and grounding it selects 300kHz. With external synchronization, the device locks to input clocks from 250kHz to 850kHz - all values confirmed in the Electrical Characteristics table and Absolute Maximum Ratings section of the official datasheet.
Does the LTC3736EUF-2#TRPBF require external current-sense resistors?
No, the LTC3736EUF-2#TRPBF does not require external current-sense resistors. It implements No RSENSE™ technology by measuring the voltage drop (VDS) across the external P-channel MOSFET's on-resistance to derive current information - a method validated in the Functional Diagram, Operation section, and Absolute Maximum Ratings for SENSE1+/SENSE2+ pins.
How does the TRACK pin enable output voltage tracking in the LTC3736EUF-2#TRPBF?
The TRACK pin on the LTC3736EUF-2#TRPBF allows VOUT2 to track VOUT1 during startup by substituting the TRACK voltage for the internal 0.6V reference at the VFB2 comparator input. When a resistor divider from VOUT1 is connected to TRACK, the controller regulates VFB2 to match that voltage until it reaches 0.6V, ensuring monotonic, ratio-matched ramp-up - a behavior explicitly detailed in the Pin Functions and Operation sections.
What thermal advantages does the QFN package of the LTC3736EUF-2#TRPBF provide?
The LTC3736EUF-2#TRPBF's 4mm × 4mm QFN package features an exposed thermal pad (Pin 25) soldered directly to PCB ground, achieving θJA = 37°C/W - significantly lower than the 130°C/W of the SSOP variant. This enables higher sustained output current in compact layouts without active cooling, as confirmed in the Absolute Maximum Ratings and Package Description tables.
Can the LTC3736EUF-2#TRPBF operate with input voltage below 2.75V?
No, the LTC3736EUF-2#TRPBF has a guaranteed operational input range of 2.75V to 9.8V, with undervoltage lockout (UVLO) disabling the device when VIN falls below 2.15V (rising threshold) or 1.95V (falling threshold). Operation below 2.75V is outside specification and not supported - this is clearly defined in the Absolute Maximum Ratings and Electrical Characteristics tables.
LTC3736EUF-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- 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):
- 2.75V ~ 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)
LTC3736EUF-2#TRPBF FAQ
1.How can I place an order for LTC3736EUF-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3736EUF-2#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 LTC3736EUF-2#TRPBF reliable?
The price and inventory of LTC3736EUF-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3736EUF-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3736EUF-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3736EUF-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3736EUF-2#TRPBF?
LTC3736EUF-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3736EUF-2#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 LTC3736EUF-2#TRPBF?
For technical support, including LTC3736EUF-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3736EUF-2#TRPBF requirements.
6.How does Aetrix verify that LTC3736EUF-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3736EUF-2#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 LTC3736EUF-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3736EUF-2#TRPBF?
All LTC3736EUF-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3736EUF-2#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 LTC3736EUF-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3736EUF-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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