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Analog Devices Inc. LTC3736EGN#TRPBF
- Part No.:
- LTC3736EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3736EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,906
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Product details
Overview
LTC3736EGN#TRPBF from Analog Devices (formerly Linear Technology) is a dual 2-phase synchronous step-down controller for high-efficiency, multi-rail DC/DC conversion in space-constrained battery-powered systems. It drives external complementary PMOS/NMOS FETs without current-sense resistors, supports input voltage range of 2.75V to 9.8V, delivers ±1.5% 0.6V reference accuracy, and enables out-of-phase operation to reduce input RMS current. It is used in dual-output lithium-ion powered notebooks and portable instruments requiring precise output tracking.
For engineers reviewing the LTC3736EGN#TRPBF datasheet, LTC3736EGN#TRPBF pinout, LTC3736EGN#TRPBF application, or LTC3736EGN#TRPBF equivalent, key selection criteria include no-RSENSE operation, 2-phase interleaving capability, tracking startup control, PLL-based frequency synchronization (250–850 kHz), and micropower shutdown (9 µA).
Technical Context
The LTC3736EGN#TRPBF implements two independent constant-frequency current-mode controllers operating 180° out of phase, using MOSFET VDS sensing to eliminate sense resistors. Each channel features programmable peak current threshold via IPRG pins (70–223 mV), internal soft-start (0.833 ms typical), and true PLL with guaranteed lock range from 250 kHz to 850 kHz.
It integrates auxiliary winding regulation via SYNC/FCB, output overvoltage protection (trip at 0.68 V on VFB), power-good monitoring with ±13.3% window, and selectable light-load modes: Burst Mode (9 µA IQ), forced continuous conduction, or pulse-skipping under external sync - all with no reverse inductor current in Burst or sync modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75 V to 9.8 V - supports single/dual Li-ion battery inputs and wide industrial rails. |
| Reference Voltage | 0.6 V ±1.5% over –40°C to 85°C - ensures tight output regulation across temperature. |
| Switching Frequency | 300 kHz / 550 kHz / 750 kHz (pin-selectable) or 250–850 kHz (PLL-sync) - balances efficiency vs. size. |
| Shutdown Quiescent Current | 9 µA - extends battery life in standby mode for portable devices. |
| Peak Current Sense Threshold | 70–223 mV (via IPRG1/IPRG2) - configures current limit per channel based on MOSFET RDS(on). |
| Tracking Function | TRACK pin enables VOUT2 to follow VOUT1 start-up ratio - eliminates sequencing ICs in dual-rail designs. |
| Power Good Accuracy | ±13.3% window around 0.6 V - provides reliable system-level rail monitoring with hysteresis. |
Pinout & Package
The LTC3736EGN#TRPBF is housed in a 24-lead plastic SSOP package (GN), 4 mm × 4 mm footprint, with exposed thermal pad connected to PGND. Pin pitch is 0.65 mm. Thermal resistance θJA = 130°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1+/SENSE2+ | Differential current sense + input | Connects to PMOS source; enables no-RSENSE operation by measuring VDS drop. |
| TG1/TG2 | Top gate drive output | Drives external PMOS gates; swing from PGND to SENSE+; rise/fall time ≤40 ns (CL = 3000 pF). |
| BG1/BG2 | Bottom gate drive output | Drives external NMOS gates; swing from PGND to SENSE+; fall time ≤40 ns (CL = 3000 pF). |
| VFB1/VFB2 | Feedback input | Monitors regulated output via resistor divider; referenced to 0.6 V ±1.5% internal bandgap. |
| ITH1/ITH2 | Error amplifier compensation & current threshold | Voltage sets peak inductor current; nominal range 0.7–2.0 V; determines current limit scaling. |
| IPRG1/IPRG2 | Peak sense voltage select | Three-state logic (VIN/GND/floating) selects 204/85/125 mV max ΔVSENSE per channel. |
| RUN/SS | Enable & soft-start control | Pull <0.65 V to shut down (9 µA IQ); internal 0.7 µA current source enables controlled ramp-up. |
| TRACK | Output tracking reference | Accepts voltage from VOUT1 divider to force VOUT2 to track during startup - eliminates sequencing delay. |
| SYNC/FCB | Sync input / FCB mode select / aux winding feedback | Enables PLL sync (250–850 kHz), selects Burst/continuous mode, or regulates auxiliary winding. |
| PGOOD | Open-drain power-good monitor | Asserts low if either VFB1 or VFB2 deviates >±13.3% from 0.6 V - signals system MCU on rail fault. |
Key Features
| Feature | Design Value |
|---|---|
| No current-sense resistors | Uses MOSFET VDS sensing to eliminate power loss and board area of sense resistors. |
| 2-phase interleaved operation | Reduces input capacitor RMS current by ~50% versus single-phase - enables smaller, cheaper input caps. |
| True PLL frequency synchronization | Locks to external clock (250–850 kHz) with guaranteed capture range - suppresses beat frequencies in noise-sensitive systems. |
| Tracking startup control | Allows VOUT2 to precisely follow VOUT1's ramp rate and final ratio - removes need for external sequencers. |
| Micropower shutdown | Draws only 9 µA in shutdown - critical for battery runtime in always-on portable instrumentation. |
| Auxiliary winding regulation | Uses SYNC/FCB pin to regulate isolated secondary outputs - simplifies flyback or forward converter designs. |
Applications
| Lithium-Ion Powered Dual-Rail Systems | Notebook & Palmtop Computers |
|---|---|
|
Use Scenario: Powering CPU core (1.8 V) and I/O (2.5 V) rails from a 2-cell Li-ion battery (7–8.4 V). IC Role / Device Role / Timing Role: Dual 2-phase controller managing independent output voltages with synchronized startup and load sharing. Use Value: Eliminates discrete sequencing ICs via TRACK pin; reduces input cap size by 50% via interleaving; extends battery life with 9 µA shutdown IQ. |
Use Scenario: Regulating multiple voltage domains (e.g., 3.3 V, 1.8 V, 1.2 V) in ultra-thin notebook motherboards. IC Role / Device Role / Timing Role: High-density, thermally efficient controller enabling compact layout with minimal thermal vias. Use Value: 4 mm × 4 mm SSOP package fits tight layouts; 130°C/W θJA supports passive cooling; Burst Mode maintains >85% efficiency at 10 mA load. |
| Portable Test Instruments | Distributed DC Power Systems |
|
Use Scenario: Providing stable, low-noise analog (±5 V, ±15 V derived) and digital (3.3 V, 1.2 V) supplies in handheld DMMs or oscilloscopes. IC Role / Device Role / Timing Role: Dual-channel controller with independent loop compensation and overvoltage protection per rail. Use Value: Output OVP (0.68 V trip) prevents damage to sensitive ADCs; PLL sync avoids interference with measurement sampling clocks. |
Use Scenario: Centralized 12 V input converted to multiple point-of-load rails (e.g., 5 V, 3.3 V, 1.8 V) in telecom line cards or industrial PLC modules. IC Role / Device Role / Timing Role: Interleaved 2-phase controller reducing EMI and input ripple in shared bus architectures. Use Value: Out-of-phase switching cuts input RMS current by >45%, lowering conducted EMI and easing EN55022 compliance. |
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 |
|---|---|---|---|
| LTC3855EUFD#PBF | Single-channel, 4-phase capable; requires external current-sense resistors; higher IQ (25 µA shutdown). | Used where higher per-rail current (>40 A) or phase count flexibility is needed - not suitable for dual-rail tracking. | Select when needing >2 phases or higher current per rail; avoid if no-RSENSE or tracking is required. |
| MP2918GL-Z | Single 2-phase controller; no TRACK pin; fixed 0.6 V reference (±2%); lacks PLL sync; 12 µA shutdown IQ. | Targeted at cost-sensitive consumer power supplies - missing precision tracking and wide sync range. | Choose for basic dual-output apps without sequencing or EMI-critical sync; not for Li-ion portable or test gear. |
Compared with LTC3736EGN#TRPBF, LTC3855EUFD#PBF offers greater phase scalability but sacrifices no-RSENSE operation and tracking, while MP2918GL-Z provides lower cost but omits PLL synchronization and precise startup coordination - making LTC3736EGN#TRPBF uniquely suited for battery-powered dual-rail systems demanding efficiency, compactness, and rail coordination.
Availability
LTC3736EGN#TRPBF is available at Aetrix Electronics and suitable for lithium-ion portable instruments, notebook computing platforms, and distributed DC power systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LTC3736EGN#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 and maintains its high-performance analog and power management portfolio with rigorous qualification and long-term product support.
The LTC3736EGN#TRPBF belongs to Linear's No-RSENSE™ synchronous controller family, designed specifically for high-efficiency, low-component-count DC/DC conversion in battery-powered and space-constrained applications.
FAQ
What is the function of the TRACK pin on the LTC3736EGN#TRPBF?
The TRACK pin on the LTC3736EGN#TRPBF allows VOUT2 to follow the startup ramp and final voltage ratio of VOUT1 by accepting a scaled voltage from VOUT1's feedback divider. During startup, the controller regulates VFB2 to match the TRACK voltage instead of the internal 0.6 V reference - enabling precise, delay-free dual-rail sequencing without external hardware. This feature is integral to the LTC3736EGN#TRPBF's role in portable dual-output systems.
Does the LTC3736EGN#TRPBF require external current-sense resistors?
No, the LTC3736EGN#TRPBF does not require external current-sense resistors. It uses MOSFET VDS sensing via the SENSE1+/SENSE2+ pins to detect inductor current, eliminating power loss, board area, and thermal drift associated with sense resistors. This no-RSENSE architecture is confirmed in the device's functional description, absolute maximum ratings, and electrical characteristics tables - a defining feature of the LTC3736EGN#TRPBF.
What is the guaranteed PLL synchronization frequency range for the LTC3736EGN#TRPBF?
The LTC3736EGN#TRPBF guarantees PLL lock to external clock sources between 250 kHz and 850 kHz across its full operating temperature range (–40°C to 85°C). This is explicitly specified in the Electrical Characteristics table under "Phase-Locked Loop Lock Range". Operation outside this band may result in loss of lock or unstable switching - a critical design constraint for EMI-sensitive applications relying on the LTC3736EGN#TRPBF's synchronization capability.
How does the LTC3736EGN#TRPBF achieve 100% duty cycle operation?
The LTC3736EGN#TRPBF achieves 100% duty cycle by holding the top PMOS gate (TG) continuously high when input voltage approaches the output level - disabling the bottom NMOS gate (BG) and allowing the output to track VIN minus PMOS RDS(on) drop. This dropout mode is enabled inherently in current-mode control when the ITH voltage demands maximum on-time, and is verified in the device's operational description and efficiency curves. It extends runtime in battery-powered LTC3736EGN#TRPBF applications.
What protection features are integrated into the LTC3736EGN#TRPBF?
The LTC3736EGN#TRPBF integrates output overvoltage protection (OVP) tripping at 0.68 V on VFB (±13.3% window), short-circuit foldback (reducing switching frequency to 1/5 normal), undervoltage lockout (UVLO active below 2.25 V), and reverse-current prevention via dedicated comparators. All protections are hardware-based, autonomous, and documented in the Applications Information section - ensuring robust fault handling without firmware intervention in the LTC3736EGN#TRPBF.
LTC3736EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-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):
- 2.75V ~ 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-SSOP
LTC3736EGN#TRPBF FAQ
1.How can I place an order for LTC3736EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3736EGN#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 LTC3736EGN#TRPBF reliable?
The price and inventory of LTC3736EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3736EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3736EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3736EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3736EGN#TRPBF?
LTC3736EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3736EGN#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 LTC3736EGN#TRPBF?
For technical support, including LTC3736EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3736EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3736EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3736EGN#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 LTC3736EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3736EGN#TRPBF?
All LTC3736EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3736EGN#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 LTC3736EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3736EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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