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Analog Devices Inc. LTC1539IGW#TRPBF
- Part No.:
- LTC1539IGW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
LTC1539IGW#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,864
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Product details
Overview
LTC1539IGW#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down switching regulator controller driving external N-channel MOSFETs in fixed-frequency, phase-lockable architecture. It delivers two independent regulated outputs (e.g., 5V/3.5A and 3.3V/3.5A), supports 3.5V–36V input, operates from –40°C to +85°C, and integrates adaptive power mode for ultrahigh efficiency down to 1% load. Used in notebook computers and portable instrumentation requiring dual-rail, low-noise DC-DC conversion.
For engineers reviewing the LTC1539IGW#TRPBF datasheet, LTC1539IGW#TRPBF pinout, LTC1539IGW#TRPBF application, or LTC1539IGW#TRPBF equivalent, key selection criteria include dual-channel current-mode control, programmable soft-start, remote output voltage sensing on Channel 2, PLL synchronization capability, and integrated 5V standby regulator with <200µA shutdown current.
Technical Context
The LTC1539IGW#TRPBF implements constant-frequency current-mode control per channel, with peak-current limiting set via external sense resistors and error amplifier compensation at ITH1/ITH2 pins. Its Adaptive Power™ architecture dynamically switches between large (TGL/BG) and small (TGS) gate drivers to sustain high efficiency across 1%–100% load range without frequency collapse.
It features dual independent control loops with pin-selectable output voltages (3.3V/5V/adjustable), secondary feedback input (SFB1) forcing continuous operation for auxiliary winding regulation, and a dedicated 5V/20mA INTVCC standby regulator active during full shutdown. The PLLIN/PLL LPF interface enables external clock synchronization with ±30% frequency tuning range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide industrial and battery-input systems including 24V rail and Li-ion stacks. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments; junction limit 125°C. |
| Switching Frequency | 125kHz typical (COSC = 56pF); PLL-tunable ±30% - enables EMI reduction via synchronization or spread-spectrum alignment. |
| Output Voltage Options | Channel 1: 3.3V or 5V only; Channel 2: 1.19V–9V adjustable with remote sense - enables flexible dual-rail generation with precision feedback. |
| Shutdown Current | <200µA - maintains ultra-low quiescent draw when both RUN/SS pins are low, preserving battery life. |
| INTVCC Regulator | 5V ±2%, 20mA - powers internal circuitry and remains active in shutdown; EXTVCC switchover at 4.7V reduces losses. |
| Current Sense Threshold | 150mV max - sets peak inductor current; combined with RSENSE determines maximum output current capability. |
Pinout & Package
Package: 36-lead plastic SSOP (GW package), 8.2mm × 20.9mm body, 0.635mm pitch, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start timing & enable control | Capacitor-to-ground sets ramp time (~0.5s/µF); <1.3V forces shutdown of respective channel. |
| SENSE+1/2, SENSE−1/2 | Differential current sense inputs | Measure voltage across external RSENSE; SENSE−1 internally tied to VOUT1, limiting remote sense to Channel 2 only. |
| VOSENSE2 | Remote feedback input (Channel 2) | Accepts direct or resistor-divider feedback from VOUT2; enables true remote sensing for improved load regulation. |
| VPROG1, VPROG2 | Output voltage programming | VPROG1 selects 3.3V/5V for Channel 1; VPROG2 selects 3.3V/5V/adjustable for Channel 2. |
| TGL1/TGL2, BG1/BG2 | High-current gate drivers | TGL drives top N-MOSFET; BG drives bottom N-MOSFET; both swing 0V to INTVCC. |
| TGS1/TGS2 | Low-current gate driver (Adaptive Power) | Drives small top N-MOSFET in low-load mode; open-circuit enables Burst Mode operation. |
| PLLIN, PLL LPF | Phase-locked loop interface | PLLIN accepts external sync clock; PLL LPF is oscillator control node (0–2.4V) for frequency shifting or lock. |
| AUXON, AUXDR, AUXFB | Auxiliary linear regulator interface | AUXON enables 0.5A PNP-based LDO; AUXDR is open-drain output; AUXFB senses 12V or adjustable output. |
| POR1, LBO, LBI | Power-on reset & low-battery detection | POR1 asserts after 65536 cycles post-regulation; LBI/LBO form independent battery monitor with 1.19V reference. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ mode | Maintains fixed 125kHz operation down to ~1% rated load by switching between TGL and TGS drivers-eliminates audible noise and improves light-load efficiency vs Burst Mode. |
| Dual independent control loops | Each channel has dedicated ITH, SENSE+, SENSE−, VPROG, and RUN/SS - enables asymmetric configurations (e.g., 5V/3.5A + 1.8V/2A) without cross-talk. |
| Remote output voltage sensing (Channel 2) | VOSENSE2 pin accepts feedback from point-of-load, compensating for PCB trace IR drop - ensures ±0.8% load regulation at target node. |
| Integrated 5V standby regulator | Delivers 5V/20mA from INTVCC while both controllers are shut down - powers microcontrollers or supervisors without external LDO. |
| PLL synchronization capability | Accepts external clock on PLLIN and tunes oscillator via PLL LPF (0–2.4V) - enables deterministic EMI reduction and multi-phase interleaving. |
Applications
| Portable Instrumentation | Notebook & Palmtop Computers |
|---|---|
Use Scenario: Battery-powered handheld multimeter with dual analog front-end rails (±5V, +3.3V). IC Role / Device Role / Timing Role: LTC1539IGW#TRPBF acts as primary dual-output DC-DC controller, generating isolated, low-noise supplies for ADC references and logic. Use Value: Adaptive Power mode sustains >85% efficiency at µA-level sleep currents; remote sensing on 3.3V rail ensures stable reference voltage under varying load conditions. | Use Scenario: Mainboard power delivery for embedded x86 CPU requiring 5V core and 3.3V I/O rails. IC Role / Device Role / Timing Role: LTC1539IGW#TRPBF serves as dual synchronous buck controller, coordinating with external Si4412DY MOSFETs and MBR140T3 Schottky diodes. Use Value: Programmable soft-start prevents inrush into bulk capacitors; POR1 provides clean reset signal synchronized to 5V rail stabilization. |
| Battery-Operated Medical Devices | DC Power Distribution Systems |
Use Scenario: Portable ultrasound probe with FPGA, RF transceiver, and analog beamformer-all powered from single Li-ion pack. IC Role / Device Role / Timing Role: LTC1539IGW#TRPBF generates 1.2V FPGA core and 3.3V interface rails, with LBI monitoring battery voltage against 1.19V threshold. Use Value: Low-battery detector triggers graceful shutdown before brownout; <200µA shutdown IQ extends runtime in standby mode. | Use Scenario: Industrial DIN-rail power module converting 24V bus to 5V/3.3V for PLC I/O modules. IC Role / Device Role / Timing Role: LTC1539IGW#TRPBF functions as dual high-efficiency buck controller, interfacing with external 30V-rated MOSFETs and ceramic output caps. Use Value: Wide 3.5V–36V input accommodates 24V nominal with ±20% tolerance; EXTVCC switchover from 5V rail cuts driver losses by >30%. |
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 |
|---|---|---|---|
| LTC3728EGN#PBF | Single-channel, higher 500kHz max frequency; no integrated 5V standby regulator; requires external bootstrap diode. | Best suited for space-constrained single-rail designs needing faster transient response; lacks dual-loop autonomy. | Select when only one high-current rail is needed and board area is critical; not suitable for dual-rail or standby-power-sensitive systems. |
| MP2918GL-Z | Monolithic dual buck (integrated MOSFETs); fixed 5V/3.3V outputs only; no PLL or remote sense; 2A per channel max. | Targeted at cost-sensitive consumer electronics; eliminates external FETs but sacrifices flexibility and headroom. | Choose for simplified BOM and lower layout complexity where output flexibility and industrial temp range are not required. |
Compared with LTC3728EGN#PBF and MP2918GL-Z, the LTC1539IGW#TRPBF uniquely combines dual independent control loops, adaptive light-load operation, remote sensing on Channel 2, and always-on 5V standby-making it optimal for high-reliability, multi-rail industrial and portable systems demanding configurability and efficiency across full load range.
Availability
LTC1539IGW#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and battery-operated medical devices requiring stable component supply, extended temperature support, and long-term industrial lifecycle assurance.
Supply support for LTC1539IGW#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1539IGW#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, dual-output DC-DC conversion in portable and battery-critical applications where thermal performance, light-load efficiency, and system-level integration matter.
FAQ
What is the operating temperature range for the LTC1539IGW#TRPBF?
The LTC1539IGW#TRPBF is specified for operation from –40°C to +85°C ambient temperature, with a maximum junction temperature of 125°C. This industrial-grade rating makes it suitable for deployment in harsh environments such as portable test equipment and vehicle-mounted instrumentation where thermal cycling and extended temperature stability are critical. The GW package's θJA of 85°C/W supports reliable thermal dissipation under full-load conditions.
Does the LTC1539IGW#TRPBF support remote voltage sensing on both outputs?
No-the LTC1539IGW#TRPBF supports true remote voltage sensing only on Channel 2 via the VOSENSE2 pin. Channel 1's SENSE−1 is internally tied to its output node, preventing remote sensing; it is limited to 3.3V or 5V fixed outputs selected by VPROG1. This architecture prioritizes precision regulation on the more sensitive or higher-priority rail (e.g., analog subsystem supply) while maintaining simplicity on the primary rail.
How does Adaptive Power™ mode improve efficiency at light loads compared to Burst Mode?
Adaptive Power™ mode in the LTC1539IGW#TRPBF sustains constant 125kHz switching down to ~1% of full load by engaging the low-current TGS driver instead of disabling switching entirely. In contrast, Burst Mode interrupts switching cycles, causing output ripple and potential EMI spikes. The result is >10× lower minimum load before efficiency degradation begins-critical for battery-powered systems that spend most time in standby or partial-active states.
Can the LTC1539IGW#TRPBF be synchronized to an external clock source?
Yes-the LTC1539IGW#TRPBF includes a fully functional Phase-Locked Loop (PLL) with dedicated PLLIN and PLL LPF pins. When an external clock is applied to PLLIN, the internal oscillator locks to it, and the PLL LPF node allows ±30% frequency tuning (via 0–2.4V control). This enables deterministic EMI reduction, multi-phase interleaving, and synchronization with system master clocks-capabilities absent in the pin-compatible LTC1538-AUX variant.
What is the purpose of the INTVCC/5V pin and how does EXTVCC affect it?
The INTVCC/5V pin delivers a regulated 5V supply for internal circuitry and gate drivers. When EXTVCC is left open, an internal LDO generates INTVCC. When EXTVCC exceeds 4.7V, an internal switch connects it directly to INTVCC-bypassing the LDO to reduce power loss. This is commonly used by connecting EXTVCC to the 5V output rail, improving overall efficiency by >30% under full load while maintaining guaranteed 4.8V–5.2V regulation at INTVCC.
LTC1539IGW#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
LTC1539IGW#TRPBF FAQ
1.How can I place an order for LTC1539IGW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1539IGW#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 LTC1539IGW#TRPBF reliable?
The price and inventory of LTC1539IGW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1539IGW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1539IGW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1539IGW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1539IGW#TRPBF?
LTC1539IGW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1539IGW#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 LTC1539IGW#TRPBF?
For technical support, including LTC1539IGW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1539IGW#TRPBF requirements.
6.How does Aetrix verify that LTC1539IGW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1539IGW#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 LTC1539IGW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1539IGW#TRPBF?
All LTC1539IGW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1539IGW#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 LTC1539IGW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1539IGW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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