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Analog Devices Inc. LTC1439IGW#TRPBF
- Part No.:
- LTC1439IGW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
LTC1439IGW#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,991
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Product details
Overview
LTC1439IGW#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 (1.19V–9V), supports 3.5V–30V input, maintains constant frequency down to ~1% load via Adaptive Power™ mode, and integrates a 0.5A low-noise linear regulator for VPP or audio supply - used in notebook computers and portable instrumentation.
For engineers reviewing the LTC1439IGW#TRPBF datasheet, LTC1439IGW#TRPBF pinout, LTC1439IGW#TRPBF application, or LTC1439IGW#TRPBF equivalent, key selection criteria include dual-channel current-mode control, PLL-synchronizable oscillator (112–240 kHz), remote sense capability on VOSENSE2, programmable soft start, and logic-controlled micropower shutdown (IQ < 30 µA).
Technical Context
The LTC1439IGW#TRPBF implements a dual-channel current-mode control architecture with independent error amplifiers, ITH1/ITH2 compensation nodes, and adaptive gate drive routing between TGL/TGS and BG pins. Its Adaptive Power™ stage dynamically switches between high-current synchronous (TGL/BG) and low-current diode-assisted (TGS) operation based on inductor current reversal detection and RSENSE voltage hysteresis.
It features a phase-locked loop (PLLIN/PLL LPF) enabling external synchronization up to ±30% frequency shift, a secondary feedback input (SFB1) forcing continuous operation for auxiliary winding regulation, and integrated power-on reset (POR2) with 65536-cycle delay referenced to fOSC (typ. 300 ms at 125 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 30V (36V absolute max); enables direct battery-input operation in 12V/24V portable systems. |
| Output Voltage Range | 1.19V to 9V per channel; set via VPROG1/VPROG2 pins or external resistive divider on VOSENSE2. |
| Oscillator Frequency | 112–138 kHz (COSC = 100 pF), up to 240 kHz with PLL; supports EMI reduction via frequency dithering or system-level sync. |
| Adaptive Power™ Threshold | Transitions to low-current mode below ~1% rated load; sustains fixed frequency operation without Burst Mode noise. |
| Shutdown Current | <30 µA (IQ); enables long battery life in always-on subsystems during deep sleep. |
| Remote Sense Support | VOSENSE2 pin with dedicated feedback path; compensates for PCB trace IR drop on second output. |
| Linear Regulator Output | 0.5A auxiliary PNP-based LDO; provides low-noise 12V (with AUXDR > 9.5V) or 1.19V (with AUXDR < 8.5V) supply. |
Pinout & Package
Package: 36-lead plastic SSOP (GW), 8.6 mm × 6.0 mm, 0.5 mm pitch, exposed pad not electrically connected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start timing & enable control | Capacitor-to-ground sets ramp time (~0.5 s/µF); <1.3V forces shutdown of respective channel. |
| SENSE+1/2, SENSE−1/2 | Current-sense differential inputs | Measure voltage across external RSENSE; built-in offset sets trip threshold (150 mV typ). |
| VOSENSE2 | Remote output voltage feedback | Connects to external resistive divider on second output; enables precision regulation under load. |
| TGL1/TGL2, BG1/BG2 | High-current gate drivers | TGL drives top N-MOSFET; BG drives bottom N-MOSFET; both swing 0V to INTVCC (5V). |
| TGS1/TGS2 | Low-current top-side gate driver | Drives small N-MOSFET + Schottky diode in Adaptive Power™ low-load mode; disabled in full sync mode. |
| SFB1 | Secondary winding feedback | Pulling <1.19V forces continuous operation on Channel 1; critical for flyback-derived auxiliary rail regulation. |
| POR2 | Power-on reset output | Open-drain signal asserting when VOUT2 drops >7.5%; releases after 65536 fOSC cycles (~300 ms @ 125 kHz). |
| AUXON, AUXFB, AUXDR | Auxiliary regulator interface | AUXON enables 0.5A PNP LDO; AUXFB senses output; AUXDR drives PNP base or comparator output. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous step-down control | Independent current-mode loops with separate ITH1/ITH2 compensation and SENSE+/− inputs for precise load transient response. |
| Phase-locked loop (PLL) | External synchronization via PLLIN pin; PLL LPF voltage (0–2.4V) shifts oscillator frequency ±30%, enabling EMI spread-spectrum or multi-rail coherence. |
| Adaptive Power™ architecture | Automatic transition between TGL/BG (high-current) and TGS (low-current) drive paths preserves fixed-frequency operation down to ~1% load. |
| Integrated 0.5A auxiliary linear regulator | Configurable 12V or 1.19V output using external PNP; AUXON enables logic-controlled on/off with <1.19V threshold. |
| Programmable soft start & shutdown | RUN/SS pins accept external capacitor for controlled ramp-up; logic-low shutdown draws <30 µA total quiescent current. |
Applications
| Portable Instrumentation Power | Notebook Computer Core Supply |
|---|---|
Use Scenario: Dual-rail power for mixed-signal data acquisition modules with analog front-end (3.3V) and digital processor (5V), operating from Li-ion battery (7–28V). IC Role / Device Role / Timing Role: LTC1439IGW#TRPBF acts as dual synchronous buck controller managing both rails, with SFB1 ensuring stable regulation of isolated auxiliary supplies derived from transformer secondaries. Use Value: Adaptive Power™ maintains fixed 125 kHz switching down to 35 mA per rail, eliminating audible noise and EMI spikes common in Burst Mode converters. | Use Scenario: Main system power for embedded controller and memory subsystem in ultra-thin notebook, requiring tight output tolerance and low dropout at peak load. IC Role / Device Role / Timing Role: LTC1439IGW#TRPBF controls two high-efficiency buck stages (5V/3A and 3.3V/3A), using VOSENSE2 remote sensing to compensate for 150 mΩ PCB trace resistance. Use Value: 99% duty cycle capability enables operation with VIN as low as 3.55V, extending runtime during battery brownout conditions. |
| Battery-Operated Medical Monitor | DC Power Distribution System |
Use Scenario: Compact wearable monitor powered by single-cell LiPo (3.0–4.2V), requiring clean 3.3V for MCU and 1.8V for sensor interface with minimal thermal rise. IC Role / Device Role / Timing Role: LTC1439IGW#TRPBF configures Channel 1 as 3.3V fixed output and Channel 2 as adjustable 1.8V via VPROG2/VOSENSE2, with AUXON-gated 0.5A LDO supplying low-noise analog bias. Use Value: Integrated POR2 provides reliable power-good signaling to MCU reset circuitry, synchronized to second output's regulation status. | Use Scenario: Centralized 24V-to-5V/3.3V conversion in industrial IoT gateway with multiple peripheral slots, requiring board-level synchronization and thermal robustness. IC Role / Device Role / Timing Role: LTC1439IGW#TRPBF operates in PLL-locked mode (PLLIN tied to master clock), aligning switching edges across multiple boards to suppress beat-frequency EMI. Use Value: GW package's 85°C/W θJA enables full 3.5A output capability at 70°C ambient without derating, unlike G-package alternatives. |
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 |
|---|---|---|---|
| LTC3723EGN#PBF | Single-channel, higher current (10A), no integrated PLL or auxiliary LDO; requires external MOSFET drivers. | Best for high-power single-rail designs where dual control is unnecessary and layout space allows discrete drivers. | Select LTC3723EGN#PBF only when scaling beyond 3.5A per rail and system-level sync is handled externally. |
| MP2918GR-Z | Dual-channel, 5V/3.3V fixed outputs only; no VPROG/VOSENSE flexibility, no SFB1, no auxiliary LDO; lower IQ (15 µA). | Suitable for cost-sensitive consumer electronics with static rail requirements and no secondary winding support. | Choose MP2918GR-Z if output voltages are fixed, remote sensing is unused, and BOM cost outweighs design flexibility. |
Compared with LTC3723EGN#PBF and MP2918GR-Z, the LTC1439IGW#TRPBF uniquely combines dual-channel programmability, PLL synchronization, SFB1-assisted auxiliary regulation, and an integrated 0.5A LDO - making it optimal for compact, multi-rail, battery-powered systems demanding low-noise, wide-input, and thermally constrained operation.
Availability
LTC1439IGW#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, notebook computer power management, and battery-operated medical monitors requiring stable component supply across extended temperature ranges (–40°C to 85°C).
Supply support for LTC1439IGW#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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1439IGW#TRPBF belongs to ADI's legacy Linear Technology power controller family, designed specifically for high-efficiency, low-noise, dual-output DC/DC conversion in space-constrained portable and industrial systems.
FAQ
What is the maximum supported switching frequency for the LTC1439IGW#TRPBF?
The LTC1439IGW#TRPBF supports up to 400 kHz in Adaptive Power™ mode when configured with appropriate COSC and external components. Its nominal oscillator frequency is 112–138 kHz (COSC = 100 pF), extendable to 240 kHz via PLL modulation. Operation above 400 kHz is not characterized and may compromise efficiency and thermal performance due to increased gate charge losses.
Does the LTC1439IGW#TRPBF support remote voltage sensing on both outputs?
The LTC1439IGW#TRPBF supports remote sensing only on the second output via the VOSENSE2 pin. The first output (Channel 1) uses internal sensing referenced to SENSE−1, except in the LTC1438-ADJ variant. This design reflects its intended use case: primary rail (Channel 1) for high-current core supplies with local feedback, and secondary rail (Channel 2) for precision peripherals requiring remote compensation.
How does the SFB1 pin function in the LTC1439IGW#TRPBF?
The SFB1 pin on the LTC1439IGW#TRPBF is a dedicated secondary winding feedback input for Channel 1. When pulled below 1.19V, it forces continuous synchronous operation regardless of load - essential for regulating auxiliary supplies derived from transformer secondaries. If unused, SFB1 must be tied to INTVCC; grounding it disables Burst Mode entirely for Channel 1.
Can the LTC1439IGW#TRPBF operate with input voltage below 3.5V?
No - the LTC1439IGW#TRPBF has a specified minimum input voltage of 3.5V. Below this, internal biasing fails and regulation cannot be guaranteed. In dropout conditions near 3.5V, the device sustains 99% duty cycle but requires sufficient headroom for INTVCC generation; EXTVCC can assist by bypassing the internal LDO when ≥4.7V is supplied.
What is the purpose of the AUXON, AUXFB, and AUXDR pins on the LTC1439IGW#TRPBF?
These pins configure the integrated 0.5A auxiliary linear regulator: AUXON is the logic-enable input (threshold 1.19V); AUXFB is the feedback node, internally divided for 12V output when AUXDR > 9.5V or externally configurable for 1.19V when AUXDR < 8.5V; AUXDR is the open-collector output driving the base of an external PNP pass transistor.
LTC1439IGW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-BSOP (0.295", 7.50mm 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC1439IGW#TRPBF FAQ
1.How can I place an order for LTC1439IGW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1439IGW#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 LTC1439IGW#TRPBF reliable?
The price and inventory of LTC1439IGW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1439IGW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1439IGW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1439IGW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1439IGW#TRPBF?
LTC1439IGW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1439IGW#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 LTC1439IGW#TRPBF?
For technical support, including LTC1439IGW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1439IGW#TRPBF requirements.
6.How does Aetrix verify that LTC1439IGW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1439IGW#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 LTC1439IGW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1439IGW#TRPBF?
All LTC1439IGW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1439IGW#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 LTC1439IGW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1439IGW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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