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Analog Devices Inc. LTC3737EUF#TRPBF
- Part No.:
- LTC3737EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3737EUF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,078
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Product details
Overview
LTC3737EUF#TRPBF from Analog Devices (formerly Linear Technology) is a dual 2-phase synchronous step-down DC/DC controller for high-efficiency power conversion in portable and battery-powered systems. It supports input voltages from 2.75V to 9.8V, delivers two independently regulated outputs from 0.6V to VIN, and features MOSFET VDS current sensing (no RSENSE required), out-of-phase operation to reduce input ripple, and programmable output voltage tracking - enabling coordinated start-up of dual rails in notebook computers and PDAs.
For engineers reviewing the LTC3737EUF#TRPBF datasheet, LTC3737EUF#TRPBF pinout, LTC3737EUF#TRPBF application, or LTC3737EUF#TRPBF equivalent, this controller is selected for dual-rail, low-noise, high-density power designs requiring precise tracking, wide input range, and efficient light-load operation via Burst Mode® or pulse skipping.
Technical Context
The LTC3737EUF#TRPBF 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 eliminate sense resistors, while ITH pins serve as combined error amplifier outputs and peak current thresholds (0.7V–2.0V range).
Frequency is set via PLLLPF pin (300kHz/550kHz/750kHz) or synchronized externally from 250kHz to 850kHz using SYNC/MODE; tracking is implemented by routing a resistor-divided VOUT1 signal to TRACK to align VOUT2 ramp with VOUT1, and PGOOD provides open-drain monitoring of both feedback nodes against ±13.3% window around 0.6V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.75V to 9.8V - supports single/dual Li-ion batteries and intermediate bus rails without external LDO pre-regulation. |
| VOUT Range | 0.6V to VIN - enables low-voltage core logic (e.g., 1.8V, 2.5V) and adjustable auxiliary rails directly from battery or input bus. |
| Reference Voltage | 0.6V ±1.5% (–40°C to 85°C) - ensures tight output regulation accuracy across industrial temperature range. |
| Switching Frequency | 250kHz to 850kHz - programmable via PLLLPF or external sync; enables optimization of inductor size vs. efficiency trade-off. |
| Peak Current Sense Threshold | Selectable: 85mV / 125mV / 204mV per channel via IPRG1/IPRG2 - adapts to MOSFET RDS(ON) and duty cycle for stable current limiting. |
| Light-Load Operation | Burst Mode® or pulse skipping selectable via SYNC/MODE - achieves >85% efficiency at 10mA load while minimizing output ripple in noise-sensitive circuits. |
| Shutdown Quiescent Current | 9µA - extends battery life during system sleep states without requiring external enable sequencing. |
| Package | 24-lead (4mm × 4mm) QFN with exposed PGND pad - thermally enhanced for high-current dual-phase operation in compact layouts. |
Pinout & Package
Package: 24-lead plastic QFN (4mm × 4mm), exposed thermal pad connected to PGND (Pin 25). Pin pitch: 0.5mm. RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1, ITH2 (Pins 1, 8) | Error amplifier output & current threshold input | Set peak inductor current per channel; voltage range 0.7V–2.0V determines comparator trip point. |
| VFB1, VFB2 (Pins 24, 7 / Pins 3, 10) | Feedback input for output voltage regulation | Compares remote-sensed output voltage to internal 0.6V reference; input bias current ≤50nA minimizes divider error. |
| TRACK (Pin 6) | Tracking reference input for second channel | Enables VOUT2 to ramp in proportion to VOUT1 during start-up using external resistor divider; eliminates rail sequencing ICs. |
| PGOOD (Pin 9) | Open-drain power-good status output | Asserts low when either VFB1 or VFB2 deviates >±13.3% from 0.6V - signals system controller that both rails are in regulation. |
| RUN/SS (Pin 14) | Enable control & external soft-start node | Pulling below 0.65V disables both channels; internal 0.7µA current source charges external CSS for programmable soft-start time. |
| SYNC/MODE (Pin 18) | External clock sync input / mode select | High = Burst Mode®; low = pulse skipping; driven by external clock = PLL lock (250–850kHz) - controls light-load behavior and EMI profile. |
| PLLLPF (Pin 3) | Oscillator frequency set / PLL loop filter | Floating = 550kHz; tied to GND = 300kHz; tied to VIN = 750kHz; when synced, connects RC filter to ground for PLL stability. |
| SENSE1+, SENSE2+ (Pins 21, 11) | Positive current sense input | Connected to MOSFET source; forms differential pair with SWx to measure VDS for lossless current sensing. |
| SW1, SW2 (Pins 22, 10) | Switch node connection | Connected to MOSFET drain and inductor; serves as negative current sense input and high-side switching node. |
| PGATE1, PGATE2 (Pins 17, 15) | P-channel MOSFET gate drive outputs | Drive swing from PGND to SENSE+; 40ns rise/fall time supports fast-switching MOSFETs up to 850kHz. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE architecture | Eliminates power loss and board space of discrete current sense resistors by using MOSFET VDS as current sense element. |
| 2-phase interleaved operation | Reduces RMS input capacitor current by ~50% versus single-phase dual controllers - enables smaller, lower-cost input capacitors and lower EMI. |
| Programmable output tracking | Allows VOUT2 to follow VOUT1 during start-up using resistor divider on VOUT1 - replaces dedicated tracking ICs in dual-rail systems. |
| True PLL synchronization | Locks internal oscillator to external clock (250–850kHz) with guaranteed capture range - essential for noise-sensitive applications requiring deterministic switching timing. |
| 100% duty cycle low-dropout mode | Maintains regulation as VIN approaches VOUT by holding high-side MOSFET fully on - extends usable battery voltage range and runtime. |
| Selectably optimized light-load efficiency | Burst Mode® (high efficiency, higher ripple) or pulse skipping (lower ripple, moderate efficiency) chosen via SYNC/MODE pin - matches system noise requirements. |
Applications
| Notebook Computers | Portable Instrumentation |
|---|---|
|
Use Scenario: Dual-rail power supply for CPU core (1.8V) and I/O (2.5V) in ultra-thin notebooks powered by 2-cell Li-ion battery (7V–8.4V). IC Role / Device Role / Timing Role: Dual 2-phase controller providing coordinated, tracked start-up and high-efficiency conversion with minimal input capacitance. Use Value: Reduces input ripple current by 53% (from 1.79ARMS to 0.91ARMS) versus single-phase design - cuts input cap count by 50% and improves battery runtime. |
Use Scenario: Precision analog front-end and digital processing subsystem in handheld multimeters or portable oscilloscopes. IC Role / Device Role / Timing Role: Generates clean, low-noise 3.3V and 1.2V rails from single Li-ion cell with tight tracking and low quiescent current. Use Value: Burst Mode® operation maintains >87% efficiency at 5mA load - extends battery life beyond 20 hours while meeting analog noise floor requirements. |
| Distributed DC Power Systems | PDAs and Mobile Terminals |
|
Use Scenario: Intermediate bus converter in modular telecom or industrial equipment distributing 5V and 3.3V from 12V backplane. IC Role / Device Role / Timing Role: Dual-phase controller delivering high-current, low-ripple outputs with external synchronization to system clock for EMI reduction. Use Value: PLL synchronization to 500kHz system clock eliminates beat frequencies and simplifies EMI filtering - meets CISPR-22 Class B limits without shielding. |
Use Scenario: Power management for ARM-based PDA with LCD backlight, memory, and RF transceiver requiring sequenced 1.8V, 2.8V, and 3.3V rails. IC Role / Device Role / Timing Role: Tracks VOUT2 to VOUT1 during start-up and provides independent overvoltage protection on each output. Use Value: Integrated OVP trips at 0.68V on VFB (13.3% above 0.6V) - protects sensitive SoC and display drivers from transient overvoltage events. |
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-output, 2-phase controller with integrated MOSFET drivers; no tracking or dual independent VOUT regulation. | Suitable only for single-rail high-current applications (e.g., FPGA core); lacks second feedback loop and TRACK pin. | Select when only one regulated output is needed and board space allows larger driver-integrated solution. |
| MP8765GL-Z | Monolithic dual buck converter (integrated MOSFETs); fixed 500kHz frequency; no PLL sync or VDS sensing. | Lower BOM count but limited to ≤3A per channel and 6V max input; no tracking or programmable light-load modes. | Prefer for cost-sensitive, medium-power applications where input voltage stays below 6V and sequencing is handled externally. |
Compared with LTC3737EUF#TRPBF, LTC3855EUFD#PBF offers higher integration but sacrifices dual-rail flexibility and tracking, while MP8765GL-Z reduces component count at the expense of design adaptability, input range, and precision control features like PLL sync and programmable current sense thresholds.
Availability
LTC3737EUF#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 industrial temperature performance (–40°C to 85°C).
Supply support for LTC3737EUF#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 (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 LTC3737 belongs to Linear's high-efficiency DC/DC controller product line, designed specifically for multi-rail, battery-powered, and noise-critical applications requiring precision tracking, wide input range, and advanced light-load optimization.
FAQ
What is the operating temperature range for the LTC3737EUF#TRPBF?
The LTC3737EUF#TRPBF is specified for operation from –40°C to +85°C ambient temperature. Its electrical characteristics - including reference voltage (0.6V ±1.5%), UVLO thresholds, and current sense accuracy - are guaranteed across this full industrial range, making it suitable for rugged portable and embedded applications where thermal margins are critical. The QFN package's θJA of 37°C/W supports reliable thermal performance under sustained load.
How does the LTC3737EUF#TRPBF achieve current sensing without a sense resistor?
The LTC3737EUF#TRPBF uses MOSFET VDS sensing: it measures the voltage difference between SENSE+ (connected to MOSFET source) and SW (connected to MOSFET drain) to derive inductor current. This eliminates power loss and PCB area associated with discrete sense resistors. The controller compensates for MOSFET RDS(ON) variation via IPRG1/IPRG2 pin configuration and applies slope compensation above 20% duty cycle to maintain stability.
Can the LTC3737EUF#TRPBF synchronize to an external clock, and what is its lock range?
Yes, the LTC3737EUF#TRPBF can synchronize its internal oscillator to an external clock applied to the SYNC/MODE pin. Its phase-locked loop guarantees lock across 250kHz to 850kHz, with typical operation up to 1.15MHz. When synchronized, the controller operates in pulse-skipping mode at light loads and maintains 180° phase offset between channels - enabling deterministic EMI reduction in noise-sensitive systems like audio or RF modules.
What is the purpose of the TRACK pin on the LTC3737EUF#TRPBF?
The TRACK pin on the LTC3737EUF#TRPBF enables output voltage tracking during start-up: when the TRACK voltage is below 0.6V, the second controller regulates VFB2 to match TRACK instead of the internal 0.6V reference. By connecting a resistor divider from VOUT1 to TRACK, VOUT2 ramps proportionally with VOUT1 - ensuring controlled power sequencing without external supervisors or timers. If unused, TRACK may be tied to VIN.
Does the LTC3737EUF#TRPBF support 100% duty cycle operation, and why is it important?
Yes, the LTC3737EUF#TRPBF supports true 100% duty cycle operation, allowing the high-side P-channel MOSFET to remain continuously on when input voltage approaches the output voltage. This low-dropout capability maximizes usable battery voltage range - for example, sustaining 1.8V output down to ~2.0V input - thereby extending runtime in Li-ion-powered devices where every millivolt of battery discharge matters.
LTC3737EUF#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)
LTC3737EUF#TRPBF FAQ
1.How can I place an order for LTC3737EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3737EUF#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 LTC3737EUF#TRPBF reliable?
The price and inventory of LTC3737EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3737EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3737EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3737EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3737EUF#TRPBF?
LTC3737EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3737EUF#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 LTC3737EUF#TRPBF?
For technical support, including LTC3737EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3737EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3737EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3737EUF#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 LTC3737EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3737EUF#TRPBF?
All LTC3737EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3737EUF#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 LTC3737EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3737EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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