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Analog Devices Inc. LTC1539CGW#TRPBF
- Part No.:
- LTC1539CGW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
LTC1539CGW#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,795
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Product details
Overview
LTC1539CGW#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 independent regulated outputs - up to 5V/3.5A and 3.3V/3.5A - with adaptive power mode, remote voltage sensing on Channel 2, and integrated 5V/20mA standby regulator. Used in notebook computers and portable instrumentation requiring high efficiency across wide load ranges.
For engineers reviewing the LTC1539CGW#TRPBF datasheet, LTC1539CGW#TRPBF pinout, LTC1539CGW#TRPBF application, or LTC1539CGW#TRPBF equivalent, key selection criteria include programmable output voltages (1.19V–9V), dual-channel current-mode control with ITH compensation, PLL synchronization capability, and 36-lead SSOP package with dedicated gate drivers (TGL/TGS/BG) and auxiliary linear regulator interface (AUXON/AUXDR/AUXFB).
Technical Context
The LTC1539CGW#TRPBF implements a constant-frequency current-mode control architecture with two independent error amplifiers, each feeding an ITH pin that sets peak inductor current via external sense resistors (RSENSE). Its Adaptive Power™ topology dynamically switches between large (TGL/BG) and small (TGS) top-side MOSFET drivers to maintain high efficiency down to ~1% of full load.
It integrates a phase-locked loop (PLLIN/PLL LPF) for frequency synchronization, supports remote sensing on VOSENSE2, includes a 5V standby regulator active during shutdown (IQ < 200µA), and features auxiliary functions: low-battery detection (LBI/LBO), power-on reset (POR1), and programmable soft-start (RUN/SS1/RUN/SS2) with internal 3µA current source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide industrial and battery-powered input rails without external pre-regulation. |
| Output Voltage Range | 1.19V to 9V - selectable per channel via VPROG pins or external dividers; Channel 1 fixed at 3.3V/5V only, Channel 2 fully adjustable with remote sense. |
| Oscillator Frequency | 112–138 kHz (typ 125 kHz) - set by COSC capacitor; extends to 200–240 kHz under PLL lock for EMI reduction. |
| Current Sense Threshold | 130–180 mV - defines maximum peak inductor current; enables precise overcurrent protection and output current scaling via RSENSE. |
| Standby Quiescent Current | < 200 µA - ensures ultra-low power consumption when both controllers are shut down while maintaining 5V/20mA INTVCC supply. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for consumer and industrial embedded applications. |
| Package | 36-lead plastic SSOP (GW) - surface-mount, thermally enhanced layout with separate PGND/SGND pins for noise isolation. |
Pinout & Package
Package: 36-lead plastic SSOP (GW), 0.025" pitch, exposed pad not specified. Thermal resistance θJA = 85°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start and enable inputs | Capacitor-to-ground sets ramp time (~0.5 s/µF); below 1.3V disables respective channel; both low enables 5V standby only. |
| SENSE+1/2, SENSE−1/2 | Current-sense differential inputs | Measure voltage drop across external RSENSE; define peak current limit; SENSE−1 tied internally - no remote sense on Channel 1. |
| VOSENSE2 | Remote feedback input (Channel 2) | Accepts voltage from output or external divider; enables true remote sensing for improved load regulation on second channel. |
| TGL1/TGL2, BG1/BG2, TGS1/TGS2 | Gate drive outputs | TGL/BG drive large N-MOSFETs (high-current mode); TGS drives small N-MOSFET + Schottky (low-current Adaptive Power mode). |
| PLLIN, PLL LPF | Phase-locked loop interface | PLLIN accepts external sync clock; PLL LPF is phase detector output and oscillator control node (0–2.4V range). |
| AUXON, AUXDR, AUXFB | Auxiliary regulator interface | AUXON enables PNP-based linear regulator; AUXDR is open-drain output; AUXFB selects internal 12V divider (>9.5V) or external feedback. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ topology | Automatically switches between large and small top-side MOSFET drivers to sustain >85% efficiency down to 1% load - avoids Burst Mode until ultralow current. |
| Dual independent current-mode control | Each channel has dedicated ITH compensation pin, current sense inputs, and programmable VPROG - enables asymmetric output configurations (e.g., 5V + 3.3V) with independent stability tuning. |
| Integrated 5V/20mA standby regulator | Remains active during full shutdown (IQ < 200µA), powering microcontrollers or logic - eliminates need for external always-on LDO. |
| PLL synchronization capability | Allows precise alignment of switching edges to external clock (e.g., system master clock), reducing beat frequencies and simplifying EMI filtering. |
| Programmable soft-start and power-on reset | RUN/SS pins accept external capacitors for controlled ramp-up; POR1 provides 300ms (65536 cycles) reset delay after first output reaches regulation - ensures reliable system boot. |
Applications
| Notebook Power Management | Portable Instrumentation |
|---|---|
Use Scenario: Dual-rail power for CPU core (3.3V) and I/O (5V) in space-constrained laptop designs with dynamic load profiles. IC Role / Device Role / Timing Role: Dual synchronous buck controller managing independent output voltages, current limiting, and adaptive efficiency modes. Use Value: Maintains >90% efficiency from 100mA to 3.5A per rail using Adaptive Power™, reducing thermal load and extending battery life. | Use Scenario: Precision analog front-end and digital subsystems in handheld test equipment requiring stable, low-noise supplies. IC Role / Device Role / Timing Role: Primary DC-DC controller delivering tightly regulated 3.3V and 5V rails with remote sensing on analog section to reject PCB IR drop. Use Value: Remote sensing on VOSENSE2 achieves ±0.5% load regulation; low dropout operation (99% duty cycle) sustains output during brownout conditions. |
| Battery-Powered Medical Devices | Industrial DC Distribution |
Use Scenario: Powering mixed-signal SoCs and sensors in portable ultrasound or glucose monitors operating from single-cell Li-ion (3.0–4.2V) or multi-cell packs (up to 28V). IC Role / Device Role / Timing Role: Wide-input buck controller enabling direct battery connection without intermediate pre-regulator; includes low-battery detection (LBI/LBO). Use Value: LBI comparator referenced to 1.19V enables accurate end-of-discharge detection; shutdown IQ < 200µA preserves battery during sleep mode. | Use Scenario: Centralized 24V-to-5V/3.3V conversion in factory automation modules with multiple downstream loads. IC Role / Device Role / Timing Role: High-current dual-output controller supporting parallel operation and synchronized switching across distributed nodes. Use Value: PLL synchronization allows multiple LTC1539CGW#TRPBF units to operate at same frequency and phase - minimizing total input ripple and easing bulk capacitor sizing. |
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#TRPBF | Single-channel, higher frequency (up to 1MHz), no integrated 5V standby regulator, requires external MOSFET drivers. | Lacks dual-output capability and auxiliary linear regulator - suitable only when one rail is needed and external sequencing is acceptable. | Select when higher switching frequency is required for smaller magnetics and lower output capacitance is acceptable. |
| MP2918GL-Z | Dual-channel, 500kHz max, no PLL sync, no auxiliary regulator, different pinout and compensation scheme. | No remote sensing on second channel; lacks POR, LBO, and standby regulator - limited for safety-critical or always-on systems. | Select for cost-sensitive, non-safety-critical applications where 500kHz operation and simplified feature set suffice. |
Compared with LTC3723EGN#TRPBF and MP2918GL-Z, the LTC1539CGW#TRPBF uniquely combines dual independent current-mode control, Adaptive Power™ efficiency optimization, PLL synchronization, and integrated 5V standby - making it optimal for compact, battery-aware, multi-rail systems requiring robust power sequencing and low-noise operation.
Availability
LTC1539CGW#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and battery-operated medical devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1539CGW#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, acquired Linear Technology in 2017 to expand its power management portfolio.
The LTC1539CGW#TRPBF belongs to ADI's legacy Linear Technology high-efficiency DC-DC controller family, designed specifically for dual-output, wide-input, battery-powered applications demanding adaptive efficiency, precise regulation, and system-level power sequencing.
FAQ
What is the maximum input voltage rating for the LTC1539CGW#TRPBF?
The LTC1539CGW#TRPBF has an absolute maximum input supply voltage (VIN) rating of 36V. Continuous operation is specified from 3.5V to 30V, with transient tolerance up to 36V for short durations. Exceeding 36V risks permanent damage to internal circuitry, including the INTVCC regulator and gate drivers. Always observe derating guidelines and ensure proper input transient suppression in high-voltage applications.
Does the LTC1539CGW#TRPBF support remote voltage sensing on both output channels?
No - the LTC1539CGW#TRPBF supports true remote voltage sensing only on Channel 2 via the VOSENSE2 pin. Channel 1's SENSE−1 pin is internally connected, preventing remote sensing; it is limited to 3.3V or 5V fixed outputs selected by VPROG1. This architectural distinction ensures precision regulation on sensitive analog rails (Channel 2) while maintaining simplicity for digital I/O rails (Channel 1).
How does the Adaptive Power™ mode improve light-load efficiency in the LTC1539CGW#TRPBF?
The LTC1539CGW#TRPBF's Adaptive Power™ mode reduces switching losses at light loads by automatically routing gate drive from the high-current TGL pins to the low-current TGS pins, engaging a smaller MOSFET and Schottky diode. This extends constant-frequency operation down to ~1% of full load (vs. ~10% in Burst Mode), avoiding audible noise and output voltage ripple associated with discontinuous conduction mode - critical for noise-sensitive analog circuits.
Can the LTC1539CGW#TRPBF be synchronized to an external clock source?
Yes - the LTC1539CGW#TRPBF includes a dedicated PLLIN pin and PLL LPF output for phase-locked loop synchronization. When an external clock is applied to PLLIN, the internal oscillator locks to it, aligning top-MOSFET turn-on edges to the rising edge of the sync signal. This enables deterministic EMI reduction and coordinated switching across multiple converters in dense PCB layouts.
What is the function of the EXTVCC pin on the LTC1539CGW#TRPBF?
The EXTVCC pin on the LTC1539CGW#TRPBF serves as an external power input to bypass the internal 5V LDO. When driven above 4.7V, it closes an internal switch to directly supply the INTVCC rail - improving overall system efficiency by eliminating LDO dropout loss. It must remain ≤ VIN at all times to prevent backfeed; typical use connects it to the highest output voltage (e.g., 5V rail) for optimal performance.
LTC1539CGW#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
LTC1539CGW#TRPBF FAQ
1.How can I place an order for LTC1539CGW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1539CGW#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 LTC1539CGW#TRPBF reliable?
The price and inventory of LTC1539CGW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1539CGW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1539CGW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1539CGW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1539CGW#TRPBF?
LTC1539CGW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1539CGW#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 LTC1539CGW#TRPBF?
For technical support, including LTC1539CGW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1539CGW#TRPBF requirements.
6.How does Aetrix verify that LTC1539CGW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1539CGW#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 LTC1539CGW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1539CGW#TRPBF?
All LTC1539CGW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1539CGW#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 LTC1539CGW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1539CGW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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