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Analog Devices Inc. LTC1439CG#TRPBF
- Part No.:
- LTC1439CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1439CG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,714
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Product details
Overview
LTC1439CG#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down switching regulator controller driving external N-channel MOSFETs in a phase-lockable fixed-frequency architecture. It delivers two regulated outputs (e.g., 5V/3.3V), supports 3.5V–30V input, maintains constant frequency down to ~1% load via Adaptive Power™ mode, and integrates a 0.5A auxiliary linear regulator for low-noise VPP or audio supply - used in notebook computers and portable instrumentation.
For engineers reviewing the LTC1439CG#TRPBF datasheet, LTC1439CG#TRPBF pinout, LTC1439CG#TRPBF application, or LTC1439CG#TRPBF equivalent, key selection criteria include dual-channel current-mode control, programmable output voltages (1.19V–9V), PLL synchronization capability, remote sense support on VOSENSE2, and confirmed 36-lead SSOP (GW) package with thermal θJA = 85°C/W.
Technical Context
The LTC1439CG#TRPBF implements a dual-channel current-mode control architecture with independent error amplifiers (ITH1/ITH2), peak-current sensing via SENSE± pins, and adaptive gate drive routing between TGL/TGS and BG outputs based on load level. Its Adaptive Power™ stage dynamically selects between high-current synchronous (TGL/BG) and low-current diode-assisted (TGS) operation to sustain fixed-frequency switching down to ~35mA per channel (1% of 3.5A).
It features a phase-locked loop (PLLIN/PLL LPF) enabling external clock synchronization up to ±30% frequency shift, a secondary feedback input (SFB1) forcing continuous conduction for auxiliary winding regulation, and integrated power-on reset (POR2) with 65536-cycle delay (~300ms at 125kHz). The auxiliary linear regulator uses AUXON/AUXFB/AUXDR to control an external PNP for 12V or 1.2V outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 30V continuous operation; absolute max 36V - enables direct use with 12V/24V industrial or battery systems without pre-regulation. |
| Switching Frequency | 112–138kHz (typ 125kHz) with COSC; PLL-extendable to 200–240kHz - balances efficiency vs. component size; supports EMI-controlled synchronization. |
| Output Voltage Range | 1.19V to 9V via VPROG1/VPROG2 pin selection or external divider on VOSENSE2 - supports standard logic rails and custom analog supplies. |
| Quiescent Current | 320µA typical in normal mode; <30µA in shutdown - critical for battery runtime in portable instruments and PDAs. |
| Current Sense Threshold | 130–180mV (ΔVSENSE(MAX)) - sets overcurrent trip point with RSENSE; enables precise foldback limiting and accurate load monitoring. |
| Thermal Resistance | θJA = 85°C/W (GW package) - confirms suitability for compact, thermally constrained PCB layouts in embedded computing. |
| Auxiliary Regulator Output | 12.0V ±0.5V (high-voltage mode) or 1.19V ±0.05V (low-voltage mode) - provides clean, logic-controlled bias for flash programming or audio DACs. |
Pinout & Package
Package: 36-lead plastic SSOP (GW), 0.025" pitch, exposed pad not present. Thermal performance rated at θJA = 85°C/W. Compatible with standard SSOP reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal circuitry and high-side drivers; must be decoupled near PGND with ≥22µF capacitor. |
| INTVCC | Internal 5V regulator output | Powers control logic and gate drivers; requires ≥2.2µF tantalum to SGND; shuts off when both RUN/SS pins are low. |
| TGL1/TGL2 | Top-side gate drive (large MOSFET) | Floating outputs driving main N-channel MOSFET gates; swing = INTVCC superimposed on SW1/SW2 node voltage. |
| BG1/BG2 | Bottom-side gate drive | Drives synchronous rectifier N-MOSFETs; rail-to-rail swing from PGND to INTVCC; disables during Adaptive Power low-load mode. |
| SFB1 | Secondary feedback input | Forces continuous conduction on Channel 1 when pulled below 1.19V - ensures regulation under light-load conditions with transformer secondaries. |
| POR2 | Power-on reset open-drain output | Sinks current when VOUT2 drops >7.5%; releases after 65536 oscillator cycles - provides deterministic system boot timing. |
| AUXON | Auxiliary regulator enable | Logic-level input (1.19V threshold); controls PNP-based linear regulator on/off - enables software-controlled VPP generation. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ mode | Automatically switches between TGL/BG (high-current) and TGS (low-current diode-assisted) drive to maintain fixed-frequency operation down to ~1% load - eliminates audible noise and preserves EMI profile. |
| Dual-channel remote sensing | VOSENSE2 pin enables Kelvin connection for Channel 2 output; eliminates IR drop errors in high-current PCB traces - critical for stable 3.3V/5V rails in notebooks. |
| Phase-locked loop (PLL) | Accepts external clock on PLLIN; adjusts oscillator frequency ±30% via PLL LPF voltage (0–2.4V) - allows synchronized multi-rail converters to reduce beat-frequency EMI. |
| Programmable soft start | RUN/SS1/RUN/SS2 pins accept external capacitors (≈0.5s/µF ramp time); clamps ITH1/ITH2 at 30% initial value - prevents inrush current and output overshoot during power-up. |
| Integrated low-battery detection | LBI/LBO pins form a comparator referenced to 1.19V; LBO sinks current when LBI < 1.19V - enables host MCU to initiate graceful shutdown before brownout. |
Applications
| Portable Instrumentation | Notebook Computing |
|---|---|
Use Scenario: Handheld multimeter with dual isolated analog front-ends requiring clean 5V ADC reference and 3.3V microcontroller supply. IC Role / Device Role / Timing Role: Dual synchronous buck controller delivering tightly regulated, low-noise, remotely sensed outputs with independent soft-start sequencing. Use Value: Adaptive Power™ maintains fixed 125kHz switching across 10mA–3.5A load range, eliminating burst-mode noise that would corrupt sensitive measurements. | Use Scenario: Mainboard power delivery for Intel Core i-series CPU and DDR3 memory, needing coordinated 5V/3.3V rails with fast transient response. IC Role / Device Role / Timing Role: Primary dual-channel DC/DC controller managing high-efficiency synchronous rectification, remote sense compensation, and PLL-synchronized switching with system clock. Use Value: SFB1 input guarantees continuous conduction on Channel 1 even under light CPU load, preventing dropout-induced memory bus instability. |
| Battery-Operated Medical Devices | DC Power Distribution Systems |
Use Scenario: Portable ultrasound probe requiring low-noise 12V VPP for transducer bias and quiet 1.2V FPGA core supply. IC Role / Device Role / Timing Role: Dual buck controller + auxiliary linear regulator generating 12V (via AUXFB/AUXDR) and 1.2V (via VPROG2/VOSENSE2) from single Li-ion input. Use Value: AUXON logic control enables on-demand VPP activation, reducing standby power by disabling 12V rail when imaging is inactive. | Use Scenario: Industrial DIN-rail power module distributing 5V/3.3V to multiple PLC I/O cards with shared thermal management. IC Role / Device Role / Timing Role: Centralized dual-output controller with EXTVCC switchover (from 5V rail) to minimize self-heating and improve overall system efficiency. Use Value: EXTVCC pin accepts 5V output to bypass INTVCC LDO, cutting internal dissipation by >40% and enabling higher ambient temperature operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3779EUF#PBF | Single-channel, 2-phase interleaved; supports up to 60V input; no integrated auxiliary LDO; uses current-mode with valley sensing. | Higher input voltage range and interleaving reduce ripple but require external MOSFETs and lack dual independent outputs. | Choose for high-input-voltage (>30V) or high-current (>10A) single-rail designs where auxiliary regulation is handled separately. |
| MP2918GL-Z | Dual-channel, 40V max input; integrated MOSFETs (no external FETs); no PLL sync; no auxiliary linear regulator; fixed 5V/3.3V outputs only. | Lower BOM count and smaller footprint, but lacks programmability, remote sense, and VPP generation capability. | Choose for cost-sensitive, space-constrained applications where fixed outputs and integrated FETs outweigh flexibility needs. |
Compared with LTC3779EUF#PBF and MP2918GL-Z, the LTC1439CG#TRPBF uniquely combines dual independent programmable outputs, Adaptive Power™ fixed-frequency low-load operation, PLL synchronization, and a dedicated auxiliary linear regulator - making it optimal for portable, battery-powered systems requiring multiple precision rails and logic-controlled VPP.
Availability
LTC1439CG#TRPBF is available at Aetrix Electronics and suitable for notebook computing, portable instrumentation, and battery-operated medical devices requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 85°C.
Supply support for LTC1439CG#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.
The LTC1439CG#TRPBF belongs to Linear's legacy high-efficiency power controller family, designed specifically for portable and battery-powered systems demanding ultralow quiescent current, adaptive low-load operation, and multi-rail coordination.
FAQ
What is the maximum supported switching frequency for the LTC1439CG#TRPBF?
The LTC1439CG#TRPBF supports a base oscillator frequency of 112–138kHz (typ 125kHz) with COSC. When using the PLL function, the frequency can be extended to 200–240kHz by applying a control voltage of 0–2.4V to the PLL LPF pin. The datasheet specifies 400kHz as the maximum recommended switching frequency to maintain efficiency and thermal stability in the 36-lead SSOP package.
Does the LTC1439CG#TRPBF support remote voltage sensing on both output channels?
The LTC1439CG#TRPBF supports remote sensing on Channel 2 via the VOSENSE2 pin, allowing Kelvin connection to the load for precise regulation. Channel 1 does not have a dedicated VOSENSE1 pin in the LTC1439CG#TRPBF; its feedback is internally tied to SENSE–1. However, the SFB1 pin can be used to enforce continuous conduction on Channel 1, improving regulation under light loads when paired with a secondary winding.
How does the Adaptive Power™ mode function in the LTC1439CG#TRPBF?
Adaptive Power™ mode in the LTC1439CG#TRPBF automatically routes gate drive from TGL1/TGL2 (large MOSFETs) to TGS1/TGS2 (small MOSFETs) when load current drops below ~35mA per channel. This avoids inefficient burst-mode operation while maintaining fixed-frequency switching down to ~1% of full-scale current - preserving EMI profile and eliminating audible noise in sensitive applications like portable instrumentation.
Can the LTC1439CG#TRPBF generate a 12V auxiliary output?
Yes - the LTC1439CG#TRPBF's auxiliary linear regulator can generate a precise 12.0V ±0.5V output when the AUXDR pin voltage exceeds 9.5V, invoking an internal resistive divider. This is achieved by connecting the collector of an external PNP pass transistor (e.g., 2N2907A) to AUXDR and the emitter to +12V, with AUXFB fed from the 12V rail. The AUXON pin enables logic-controlled on/off functionality.
What is the thermal performance of the LTC1439CG#TRPBF in its GW package?
The LTC1439CG#TRPBF in the 36-lead plastic SSOP (GW) package has a specified junction-to-ambient thermal resistance (θJA) of 85°C/W under standard JEDEC 2-layer board conditions. This value assumes proper PCB copper area and thermal vias beneath the exposed pad region. The device's maximum junction temperature is 125°C, supporting reliable operation in industrial environments up to 85°C ambient when properly heatsinked.
LTC1439CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-SSOP (0.209", 5.30mm 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:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 30V
- Frequency - Switching:
- Up to 400kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power on Reset, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC1439CG#TRPBF FAQ
1.How can I place an order for LTC1439CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1439CG#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 LTC1439CG#TRPBF reliable?
The price and inventory of LTC1439CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1439CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1439CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1439CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1439CG#TRPBF?
LTC1439CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1439CG#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 LTC1439CG#TRPBF?
For technical support, including LTC1439CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1439CG#TRPBF requirements.
6.How does Aetrix verify that LTC1439CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1439CG#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 LTC1439CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1439CG#TRPBF?
All LTC1439CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1439CG#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 LTC1439CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1439CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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