My Inquiry
My Account
Analog Devices Inc. LTC3736EUF-2#PBF
- Part No.:
- LTC3736EUF-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3736EUF-2#PBF.pdf
- Description:
- IC REG CTRLR BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,866
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3736EUF-2#PBF 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, 0.6V ±1% reference, 2.75V–9.8V input range, and supports up to 750kHz switching in a 4mm × 4mm QFN-24 package for high-density notebook and portable instrument power rails.
For engineers reviewing the LTC3736EUF-2#PBF datasheet, LTC3736EUF-2#PBF pinout, LTC3736EUF-2#PBF application, or LTC3736EUF-2#PBF equivalent, key selection criteria include out-of-phase dual-channel operation for reduced input ripple, VDS-based current sensing, programmable pulse-skipping/forced continuous mode, and tracking startup for coordinated multi-rail sequencing.
Technical Context
The LTC3736EUF-2#PBF implements 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 maintaining ±1% output regulation via a 0.6V internal reference.
Its PLL architecture enables synchronization from 250kHz to 850kHz via the SYNC/FCB pin, with frequency set by the PLLLPF pin (300/550/750kHz options). The TRACK pin enables voltage-ratio-based startup coordination between outputs, and RUN/SS provides internal soft-start (1ms) or external capacitor-programmable ramp.
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. |
| Reference Voltage | 0.6V ±1% - enables accurate output regulation down to sub-1V rails with tight load/line regulation. |
| Max Switching Frequency | 750kHz - allows use of compact 2.2μH inductors and low-ESR ceramic capacitors. |
| Current Sense Method | VDS sensing on P-MOSFET - eliminates sense resistor losses and PCB area, improving efficiency at high currents. |
| Phase Operation | 2-phase, 180° interleaved - reduces input ripple current by ~50%, enabling smaller input capacitance and lower EMI. |
| Tracking Function | TRACK pin accepts voltage divider from VOUT1 - ensures monotonic, ratio-matched startup of VOUT2 relative to VOUT1. |
| Shutdown IQ | 9μA - extends battery life in portable systems during deep sleep or standby modes. |
Pinout & Package
The LTC3736EUF-2#PBF is housed in a thermally enhanced 24-lead (4mm × 4mm) plastic QFN package with exposed pad (Pin 25) soldered to PCB ground for optimal thermal performance (θJA = 37°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 (Pins 1, 8) | Current threshold & error amp compensation node | Sets peak inductor current limit per channel; voltage range 0.7V–2.0V determines comparator trip point. |
| PLLLPF (Pin 6) | Frequency select / PLL loop filter | Selects unsynchronized oscillator frequency (300/550/750kHz); serves as RC filter node when synchronized externally. |
| RUN/SS (Pin 17) | Enable & external soft-start input | Below 0.65V disables both channels; internal 0.7μA current source ramps voltage for controlled startup. |
| TRACK (Pin 9) | Tracking reference input | When <0.6V, forces VFB2 regulation to TRACK voltage-enables ratio-matched VOUT2 startup from VOUT1 divider. |
| SYNC/FCB (Pin 21) | Auxiliary feedback / sync input / mode select | Accepts external clock (250–850kHz), auxiliary winding signal, or DC bias to select pulse-skipping (VIN) vs forced continuous (GND). |
| PGOOD (Pin 12) | Open-drain power-good monitor | Pulled low if either VFB1 or VFB2 deviates >±13.3% from 0.6V-provides system-level rail validation. |
| IPRG1 / IPRG2 (Pins 2, 5) | Peak sense voltage programming | Select max ΔVSENSE per channel: GND=167mV, float=240mV, VIN=345mV-optimizes current limit across duty cycles. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE required | Uses MOSFET VDS sensing to eliminate power loss and board space associated with discrete current-sense resistors. |
| Out-of-phase dual control | Interleaves two 2-phase controllers to halve RMS input ripple current-reducing input cap size, cost, and EMI filtering burden. |
| True PLL synchronization | Locks internal oscillator to external clock (250–850kHz) with guaranteed capture range-enables deterministic timing in noise-sensitive systems. |
| 100% duty cycle operation | Enables low-dropout regulation near VIN-extends runtime in battery-powered applications where input voltage sags under load. |
| Independent current limit programming | IPRG1/IPRG2 pins allow per-channel peak sense voltage selection-supports asymmetric output designs with different current requirements. |
Applications
| Notebook Power Rails | Portable Instrument Sequencing |
|---|---|
Use Scenario: Dual-output power for CPU core (2.5V) and I/O (1.8V) in ultra-thin notebooks powered by 2-cell Li-ion batteries. IC Role / Device Role / Timing Role: Dual 2-phase synchronous controller coordinating interleaved switching and output tracking during cold start and load transients. Use Value: Reduces input ripple current by >45% versus single-phase dual controllers-enabling smaller 10μF input caps instead of 47μF, saving board area and cost. | Use Scenario: Precision analog front-end and digital logic supplies in handheld test equipment requiring monotonic, ratio-matched rail startup. IC Role / Device Role / Timing Role: Tracking controller ensuring VOUT2 rises exactly in proportion to VOUT1 using resistor-divider feedback to TRACK pin. Use Value: Prevents reverse current flow and latch-up during power-up by enforcing strict 1:1 tracking-eliminating need for external sequencing ICs. |
| Distributed DC Power Systems | Lithium-Ion Powered PDAs |
Use Scenario: Local regulation of 3.3V and 1.2V rails from a shared 5V intermediate bus in modular embedded systems. IC Role / Device Role / Timing Role: Dual-channel controller with independent feedback loops and synchronized switching via SYNC/FCB pin. Use Value: Enables deterministic inter-rail timing and reduced conducted EMI across multiple boards-simplifying EMC compliance testing. | Use Scenario: High-efficiency dual-rail conversion in PDA mainboard where battery voltage ranges from 4.2V (full) to 2.75V (discharged). IC Role / Device Role / Timing Role: Low-quiescent-current controller supporting pulse-skipping at light loads and 100% duty cycle near dropout. Use Value: Maintains >85% efficiency down to 10mA load while extending usable battery capacity by 12% versus fixed-frequency alternatives. |
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 |
|---|---|---|---|
| MP2950GQ-Z (Monolithic Power) | Integrated MOSFETs (40V max), no VDS sensing, fixed 500kHz frequency, no TRACK pin | Lower BOM count but limited to ≤40V input; lacks output tracking and external sync capability | Choose MP2950GQ-Z only for cost-sensitive, low-voltage (<30V) applications where tracking and synchronization are unnecessary. |
| ISL95831IRZ (Renesas) | Supports 3-phase operation, integrated drivers, 0.5% reference, but requires external sense resistors | Better accuracy and higher phase count, yet adds sense resistor losses and layout complexity | Choose ISL95831IRZ when tighter output tolerance (<±0.5%) and 3-phase scalability outweigh added component count and efficiency penalty. |
Compared with MP2950GQ-Z and ISL95831IRZ, the LTC3736EUF-2#PBF uniquely combines VDS-based current sensing, true output tracking, and PLL synchronization in a dual 2-phase architecture-making it optimal for high-efficiency, multi-rail portable systems demanding minimal input ripple and coordinated startup.
Availability
LTC3736EUF-2#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, distributed DC power systems, and lithium-ion powered PDAs requiring stable component supply and long-term design-in support.
Supply support for LTC3736EUF-2#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 and maintains full product support, documentation, and manufacturing continuity for all Linear power management ICs.
The LTC3736EUF-2#PBF belongs to Linear's high-performance synchronous controller family, designed specifically for high-efficiency, multi-rail DC/DC conversion in space-constrained portable and computing applications.
FAQ
What is the primary function of the TRACK pin on the LTC3736EUF-2#PBF?
The TRACK pin on the LTC3736EUF-2#PBF enables output voltage tracking during startup: when the voltage at TRACK is below 0.6V, the second controller regulates VFB2 to match the TRACK voltage rather than the internal 0.6V reference. This allows VOUT2 to rise in precise proportion to VOUT1-typically implemented using a resistor divider from VOUT1 connected to TRACK-ensuring monotonic, coordinated rail sequencing critical for FPGAs and processors.
Does the LTC3736EUF-2#PBF require external current-sense resistors?
No, the LTC3736EUF-2#PBF does not require external current-sense resistors. It uses MOSFET VDS sensing across the external P-channel high-side switch to detect peak inductor current. This method eliminates sense resistor power loss and PCB area, improving efficiency-especially at high load currents-while maintaining stable current-mode control in the LTC3736EUF-2#PBF.
How is switching frequency programmed on the LTC3736EUF-2#PBF?
Switching frequency on the LTC3736EUF-2#PBF is programmed via the PLLLPF pin: tying it to GND selects 300kHz, floating selects 550kHz, and tying it to VIN selects 750kHz. When synchronized to an external clock applied to SYNC/FCB, the PLLLPF pin becomes the loop filter node (RC network to SGND), and the LTC3736EUF-2#PBF locks to frequencies from 250kHz to 850kHz with guaranteed capture range.
What protection features are integrated into the LTC3736EUF-2#PBF?
The LTC3736EUF-2#PBF integrates overvoltage protection (OVP) that disables the high-side MOSFET if VFB exceeds 0.68V (13.3% above 0.6V reference), short-circuit protection that reduces switching frequency to 1/5th normal rate when VFB drops below 0.12V, and undervoltage lockout (UVLO) that disables all circuitry below 2.3V VIN. These protections operate independently per channel and are active across the full –40°C to 85°C temperature range.
Can the LTC3736EUF-2#PBF operate in forced continuous conduction mode (CCM)?
Yes, the LTC3736EUF-2#PBF supports forced continuous conduction mode (CCM) at light loads by grounding the SYNC/FCB pin. In this mode, the inductor current is allowed to reverse, reducing audio noise and output ripple compared to pulse-skipping-but with lower light-load efficiency. Pulse-skipping is enabled by connecting SYNC/FCB to VIN or an external clock, and the LTC3736EUF-2#PBF automatically defaults to pulse-skipping during startup or short-circuit conditions regardless of SYNC/FCB state.
LTC3736EUF-2#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)
LTC3736EUF-2#PBF FAQ
1.How can I place an order for LTC3736EUF-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3736EUF-2#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 LTC3736EUF-2#PBF reliable?
The price and inventory of LTC3736EUF-2#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3736EUF-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3736EUF-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3736EUF-2#PBF?
LTC3736EUF-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3736EUF-2#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 LTC3736EUF-2#PBF?
For technical support, including LTC3736EUF-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3736EUF-2#PBF requirements.
6.How does Aetrix verify that LTC3736EUF-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3736EUF-2#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 LTC3736EUF-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3736EUF-2#PBF?
All LTC3736EUF-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3736EUF-2#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 LTC3736EUF-2#PBF part is unused and in its original packaging.
Return procedure for LTC3736EUF-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3736EUF-2#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
