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Analog Devices Inc. LTC1439CGW#TRPBF
- Part No.:
- LTC1439CGW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
LTC1439CGW#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,253
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Product details
Overview
LTC1439CGW#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 ultrahigh efficiency down to 1% load via Adaptive Power™ mode, maintains 99% duty cycle for low-dropout operation, and integrates a 0.5A auxiliary linear regulator for low-noise VPP or audio supply - used in portable instruments and battery-powered systems.
For engineers reviewing the LTC1439CGW#TRPBF datasheet, LTC1439CGW#TRPBF pinout, LTC1439CGW#TRPBF application, or LTC1439CGW#TRPBF equivalent, key selection criteria include programmable fixed frequency (112–138 kHz, PLL-extendable to 240 kHz), dual N-MOSFET synchronous drive capability, remote output voltage sensing on Channel 2, logic-controlled micropower shutdown (IQ < 30 µA), and support for wide input range (3.5V to 30V).
Technical Context
The LTC1439CGW#TRPBF implements a current-mode, constant-frequency step-down architecture with independent error amplifiers per channel. Each channel uses an external current-sense resistor and adaptive gate-drive selection (TGL/TGS/BG pins) to switch between high-current synchronous mode and low-current diode-assisted mode - enabling stable 400 kHz operation down to ~1% rated load without burst-mode noise.
It features dual independent control loops with pin-selectable output voltages (1.19V, 3.3V, 5V), secondary feedback input (SFB1) forcing continuous operation on Channel 1, and integrated power-on reset (POR2) with 65536-cycle delay (~300 ms at 125 kHz). The auxiliary regulator uses AUXON/AUXFB/AUXDR pins to control an external PNP for 12V or adjustable low-noise output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 30V (absolute max 36V) - supports wide battery and DC distribution inputs. |
| Switching Frequency | 112–138 kHz (typ), extendable to 240 kHz via PLL - enables EMI control and inductor size optimization. |
| Output Voltage Options | 1.19V (adjustable), 3.3V, or 5V per channel - selected via VPROG1/VPROG2 pin states. |
| Quiescent Current | 320 µA (normal), <30 µA (shutdown) - enables long battery life in portable devices. |
| Duty Cycle Max | 99% - allows ultra-low dropout operation near VIN = VOUT. |
| Auxiliary Regulator | 0.5A linear output with 12V or adjustable voltage - driven by external PNP via AUXDR pin. |
| Operating Temp | –40°C to 85°C (Industrial grade) - validated for rugged embedded environments. |
Pinout & Package
Package: 36-lead plastic SSOP (GW package), 0.025" pitch, JEDEC MS-013AC. Thermal resistance θJA = 85°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start & 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 to regulate peak inductor current (ΔVSENSE = 150 mV typ). |
| VPROG1, VPROG2 | Output voltage programming | DC voltage level selects 1.19V/3.3V/5V output via internal attenuator (open = adjustable). |
| VOSENSE2 | Remote feedback input (Ch2) | Accepts resistive divider from VOUT2 for precision regulation - not present on Ch1 for LTC1439. |
| TGL1/TGL2, BG1/BG2 | Main top/bottom N-MOSFET drivers | Drive large external N-FETs; TGL floats on SW node, BG referenced to PGND. |
| TGS1/TGS2 | Small top N-MOSFET driver | Enables Adaptive Power™ low-load mode; open = Burst Mode fallback. |
| SFB1 | Secondary winding feedback | Pull <1.19V to force continuous operation on Ch1 - critical for transformer-coupled designs. |
| POR2 | Power-on reset output | Open-drain signal asserting when VOUT2 drops >7.5%; releases after 65536 oscillator cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ mode | Automatically switches between TGL/BG (high-load) and TGS (low-load) drive paths - sustains fixed frequency down to ~1% load without audible noise. |
| Phase-locked loop (PLL) | Allows synchronization to external clock via PLLIN; PLL LPF pin accepts 0–2.4V control voltage for ±30% frequency tuning. |
| Remote output sensing | VOSENSE2 pin enables Kelvin connection to VOUT2 - eliminates PCB trace IR drop errors in precision supplies. |
| Integrated POR timer | Generates system-ready signal delayed by exactly 65536 oscillator cycles (~300 ms at 125 kHz) after VOUT2 reaches regulation. |
| Logic-controlled auxiliary regulator | AUXON pin enables/disables 0.5A PNP-based linear regulator; AUXFB selects 12V (internal divider) or adjustable output (<8.5V). |
Applications
| Portable Medical Instrumentation | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Handheld multimeter with dual isolated analog front-ends requiring clean 3.3V digital rail and low-noise 5V analog supply. IC Role / Device Role / Timing Role: Dual synchronous buck controller providing tightly regulated, ripple-free outputs; auxiliary LDO supplies reference voltage generator. Use Value: Adaptive Power™ ensures silent operation during low-power standby; remote sensing maintains ±0.5% output accuracy despite board layout parasitics. | Use Scenario: Field-deployable oscilloscope module powered by Li-ion battery pack (7–28V), needing efficient 5V/3.3V rails and precise 12V VPP for probe bias. IC Role / Device Role / Timing Role: Primary DC/DC controller managing main power conversion; auxiliary regulator generates stable 12V from same input using external PNP. Use Value: 99% duty cycle enables full 5V output even at 5.2V battery minimum; PLL synchronization reduces EMI in mixed-signal measurement environment. |
| Industrial IoT Edge Node | Embedded Computing Platform |
Use Scenario: DIN-rail mounted sensor gateway with cellular modem, requiring robust 3.3V core supply and 5V peripheral rail across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Dual-channel controller delivering thermally stable outputs; POR2 signal coordinates firmware boot sequence after power stabilization. Use Value: Industrial-grade temp rating and 85°C/W θJA ensure reliable thermal performance in enclosed enclosures; foldback current limiting protects against shorted loads. | Use Scenario: Fanless embedded PC motherboard needing compact, high-efficiency dual-core voltage rails with minimal acoustic noise. IC Role / Device Role / Timing Role: Main power controller for CPU I/O and memory subsystems; SFB1 input supports auxiliary winding regulation for isolated auxiliary supply. Use Value: Fixed-frequency operation avoids variable-frequency interference with high-speed data buses; soft-start sequencing prevents inrush-induced brownouts. |
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-phase dual-output controller with integrated MOSFET drivers; supports up to 60V input; no auxiliary LDO. | Lacks integrated 0.5A linear regulator and SFB1 functionality; requires external components for VPP generation. | Choose when higher input voltage (>30V) or tighter layout integration is prioritized over auxiliary supply simplicity. |
| MP2918GL-Z | Monolithic dual buck IC (integrated FETs); 4.5–28V input; fixed 5V/3.3V outputs; no PLL or remote sensing. | No Adaptive Power™, no SFB1, no auxiliary regulator - limited flexibility for precision or low-noise use cases. | Choose for cost-sensitive, space-constrained designs where external FETs and advanced features are unnecessary. |
Compared with LTC3779EUF#PBF and MP2918GL-Z, the LTC1439CGW#TRPBF uniquely combines dual-channel synchronous control, Adaptive Power™ low-load operation, integrated auxiliary linear regulator, and secondary feedback support - making it optimal for portable, battery-critical, and low-noise multi-rail systems requiring design flexibility and thermal robustness.
Availability
LTC1439CGW#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered test equipment, and industrial IoT edge nodes requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LTC1439CGW#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 digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1439 belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, low-noise, dual-output DC/DC conversion in portable and battery-operated systems demanding precision regulation and thermal resilience.
FAQ
What is the maximum supported switching frequency for the LTC1439CGW#TRPBF?
The LTC1439CGW#TRPBF operates at a base frequency of 112–138 kHz (set by COSC capacitor), and its PLL circuit allows extension up to 240 kHz when driven by an external synchronizing signal on PLLIN. The datasheet specifies 400 kHz as the absolute maximum recommended switching frequency to maintain efficiency and thermal stability - exceeding this risks increased gate charge losses and reduced converter efficiency.
Does the LTC1439CGW#TRPBF support remote voltage sensing on both output channels?
No - remote voltage sensing is only supported on Channel 2 via the VOSENSE2 pin. Channel 1 does not have a dedicated VOSENSE1 pin on the LTC1439CGW#TRPBF; instead, its feedback is internally tied to SENSE−1. This architecture is confirmed in the Pin Functions section and Table 1 of the datasheet, which explicitly states VOSENSE1 is only available on the LTC1438-ADJ variant.
How does the Adaptive Power™ mode function in the LTC1439CGW#TRPBF?
The LTC1439CGW#TRPBF's Adaptive Power™ mode automatically routes gate drive from TGL1/TGL2 (large MOSFETs) to TGS1/TGS2 (small MOSFETs) when load current drops below ~1% of rated output. This preserves fixed-frequency operation and avoids burst-mode noise. Drive reverts to TGL/TGS when inductor current exceeds 20 mV/RSENSE or ITH voltage rises above 0.6 V - ensuring seamless transition across load ranges.
Can the auxiliary regulator in the LTC1439CGW#TRPBF generate voltages other than 12V?
Yes - the LTC1439CGW#TRPBF's auxiliary regulator can generate adjustable voltages below 8.5V by connecting an external resistive divider to the AUXFB pin and keeping AUXDR < 8.5V. When AUXDR exceeds 9.5V, the internal 12V divider engages. This dual-mode capability is documented in the Electrical Characteristics table (VAUXFB values) and Applications Information section, enabling flexible VPP or low-noise bias generation.
What is the purpose of the SFB1 pin on the LTC1439CGW#TRPBF?
The SFB1 pin on the LTC1439CGW#TRPBF provides secondary winding feedback for Channel 1. Pulling SFB1 below 1.19V forces continuous synchronous operation - essential for maintaining regulation in flyback-derived or transformer-coupled auxiliary supplies. It is not used for primary output regulation but ensures stability when the main output is unloaded while a secondary winding remains active.
LTC1439CGW#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC1439CGW#TRPBF FAQ
1.How can I place an order for LTC1439CGW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1439CGW#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 LTC1439CGW#TRPBF reliable?
The price and inventory of LTC1439CGW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1439CGW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1439CGW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1439CGW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1439CGW#TRPBF?
LTC1439CGW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1439CGW#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 LTC1439CGW#TRPBF?
For technical support, including LTC1439CGW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1439CGW#TRPBF requirements.
6.How does Aetrix verify that LTC1439CGW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1439CGW#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 LTC1439CGW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1439CGW#TRPBF?
All LTC1439CGW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1439CGW#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 LTC1439CGW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1439CGW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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