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Analog Devices Inc. LTC1539CGW#PBF
- Part No.:
- LTC1539CGW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
LTC1539CGW#PBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,531
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Product details
Overview
LTC1539CGW#PBF 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#PBF datasheet, LTC1539CGW#PBF pinout, LTC1539CGW#PBF application, or LTC1539CGW#PBF equivalent, key selection criteria include programmable output voltages (1.19V–9V), dual-channel current-mode control, PLL synchronization capability, ultralow shutdown IQ (<200µA), and support for Adaptive Power™ low-current operation down to ~1% load.
Technical Context
The LTC1539CGW#PBF implements a constant-frequency, current-mode control architecture with separate error amplifiers and current comparators per channel. Each channel uses an external RSENSE to set peak inductor current, with ITH1/ITH2 pins serving as compensation nodes and current threshold modulators.
It integrates a phase-locked loop (PLLIN/PLL LPF) for frequency synchronization, supports burst mode or Adaptive Power™ low-load operation via TGS1/TGS2 pin configuration, and includes dedicated auxiliary circuitry: a 0.5A linear regulator (AUXON/AUXDR/AUXFB), low-battery comparator (LBI/LBO), and power-on reset timer (POR1) with 65536-cycle delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - enables direct operation from 5V, 12V, or 24V rails without pre-regulation. |
| Output Voltage Range | 1.19V to 9V (Channel 2); 3.3V or 5V only (Channel 1) - supports standard logic supplies and adjustable analog rails. |
| Oscillator Frequency | 112–138 kHz (free-running); up to 240 kHz (PLL-locked) - balances efficiency, EMI, and component size. |
| Current Sense Threshold | 130–180 mV - sets maximum inductor current with ±20mV hysteresis for stable foldback limiting. |
| Shutdown Quiescent Current | <200 µA - maintains ultra-low power in system sleep states while keeping 5V standby active. |
| INTVCC Regulator | 5.0V ±2%, 20mA - powers internal logic and gate drivers; switchover to EXTVCC above 4.7V improves efficiency. |
| Operating Temperature | 0°C to 70°C - specified for commercial-grade embedded and portable applications. |
Pinout & Package
Package: 36-lead plastic SSOP (GW package), 0.025" pitch, JEDEC MS-013AC. Thermal resistance θJA = 85°C/W. RoHS-compliant, lead-free (Pb-free).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 | Soft-start & enable input | Capacitor-to-ground sets ramp time (~0.5s/µF); <1.3V forces shutdown of respective channel. |
| SENSE+1/2, SENSE−1/2 | Current-sense differential inputs | Measure voltage across external RSENSE; SENSE−1 internally tied to VOUT1, disabling true remote sense on Channel 1. |
| VOSENSE2 | Remote feedback input (Channel 2) | Accepts voltage from external divider or directly from VOUT2 - enables precision regulation under PCB trace drop. |
| VPROG1, VPROG2 | Output voltage programming | VPROG1 selects 3.3V/5V only; VPROG2 enables 3.3V/5V/adjustable via open/ground/INTVCC states. |
| TGL1/TGL2, BG1/BG2 | High-current gate drivers | TGLx drives top N-MOSFET (floating); BGx drives bottom N-MOSFET (ground-referenced); both swing 0–INTVCC. |
| TGS1/TGS2 | Low-current gate driver select | Open = Burst Mode; driven = Adaptive Power™ mode using small top MOSFET for sub-1% load efficiency. |
| 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 0.5A PNP-based linear regulator; AUXDR is open-drain output; AUXFB senses feedback for 12V or adjustable outputs. |
| POR1, LBO, LBI | Supervisory outputs/inputs | POR1 asserts after 65536 cycles post-regulation; LBI/LBO form low-battery detector referenced to 1.19V internal bandgap. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Power™ Mode | Automatically switches between large and small top-side MOSFETs to sustain constant-frequency operation down to ~1% rated load - avoids audible noise and improves light-load efficiency vs. Burst Mode. |
| Dual Independent Control Loops | Separate ITH, SENSE, and RUN/SS pins per channel allow asymmetric configurations - e.g., 5V/3.5A + 1.8V/2A - with independent soft-start and shutdown. |
| Remote Output Sensing (Channel 2) | VOSENSE2 pin accepts feedback from point-of-load, compensating for IR drop in PCB traces or connectors - critical for tight-tolerance digital supply rails. |
| Integrated 5V Standby Regulator | Delivers 5V/20mA continuously during full shutdown (IQ < 200µA), powering real-time clocks, wake-up logic, or microcontroller retention domains. |
| Programmable Fixed Frequency with PLL Sync | Free-running fOSC = 125kHz typical; PLL lock extends range to 240kHz and eliminates beat frequencies in multi-rail systems. |
Applications
| Portable Instrumentation | Notebook/PDA Power |
|---|---|
Use Scenario: Handheld multimeter with dual analog front-end rails (±5V, +3.3V) and microcontroller core supply. IC Role / Device Role / Timing Role: Dual-channel DC/DC controller generating isolated, tightly regulated analog and digital supplies from single Li-ion battery pack. Use Value: Adaptive Power™ sustains >85% efficiency at 10mA load; remote sensing on 3.3V rail ensures ADC reference stability within ±0.5% over temperature. | Use Scenario: Mainboard VRM supplying CPU core (1.1V), memory (1.5V), and I/O (3.3V/5V) in ultra-thin laptop. IC Role / Device Role / Timing Role: Primary dual-output controller for 5V/3.3V system rails, coordinating with secondary POL converters via synchronized PLL clock. Use Value: PLL synchronization reduces conducted EMI by aligning switching edges; 5V standby powers EC firmware during S3 suspend. |
| Battery-Operated Medical Devices | DC Power Distribution Systems |
Use Scenario: Portable ultrasound probe requiring low-noise 5V analog supply and 3.3V digital logic rail from 7.4V Li-Poly battery. IC Role / Device Role / Timing Role: Dual synchronous buck controller delivering clean, ripple-free outputs with independent soft-start sequencing. Use Value: Integrated 5V LDO provides low-noise audio/ADC supply; low-battery comparator (LBI) triggers graceful shutdown before battery cutoff. | Use Scenario: Industrial IoT gateway with multiple sensor modules, wireless radio, and isolated CAN transceiver - all powered from 24V DC bus. IC Role / Device Role / Timing Role: Central dual-output regulator feeding downstream DC/DCs and LDOs; EXTVCC tied to 5V output to reduce thermal load. Use Value: Wide 3.5–36V input accommodates brownout and surge conditions; 36-lead SSOP allows compact layout with thermal relief pads for 2.5W dissipation. |
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 5V standby, requires external MOSFET drivers. | Lacks dual independent outputs and auxiliary regulator - suitable only when one high-current rail suffices. | Select LTC3723EGN#PBF only if designing single-rail high-current POL with external driver flexibility and no need for standby or aux functions. |
| MP2918GL-Z | Dual-channel, 5V/3.3V fixed outputs only, no VPROG or remote sense, lower max VIN (28V), no PLL sync. | No adjustable outputs or synchronization - limited to simple dual-rail systems without sequencing or EMI coordination needs. | Choose MP2918GL-Z for cost-sensitive, fixed-voltage applications where Adaptive Power™, remote sense, and PLL are unnecessary. |
Compared with LTC3723EGN#PBF and MP2918GL-Z, the LTC1539CGW#PBF uniquely combines dual-channel programmability, remote sensing on Channel 2, integrated 5V standby, and PLL synchronization - making it optimal for portable, battery-aware, and EMI-sensitive dual-rail systems requiring design flexibility and long-term supply stability.
Availability
LTC1539CGW#PBF is available at Aetrix Electronics and suitable for notebook computing, portable instrumentation, and battery-operated medical devices requiring stable component supply, long lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC1539CGW#PBF 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 strengthen its power management portfolio.
The LTC1539CGW#PBF belongs to ADI's legacy Linear Technology switching controller family, designed specifically for high-efficiency, low-noise dual-output DC/DC conversion in space-constrained portable and battery-powered systems.
FAQ
What is the maximum input voltage rating for the LTC1539CGW#PBF?
The LTC1539CGW#PBF 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 ≤100ms. Exceeding 36V risks permanent damage to internal circuitry, including the INTVCC regulator and gate drivers.
Does the LTC1539CGW#PBF support remote voltage sensing on both output channels?
No. The LTC1539CGW#PBF supports true remote voltage sensing only on Channel 2 via the VOSENSE2 pin. Channel 1's SENSE−1 pin is internally tied to its output, preventing remote sense implementation - it is restricted to 3.3V or 5V fixed outputs selected by VPROG1.
How does Adaptive Power™ mode operate in the LTC1539CGW#PBF?
Adaptive Power™ mode in the LTC1539CGW#PBF automatically routes gate drive from TGLx (large top MOSFET) to TGSx (small top MOSFET) when load drops below ~1% of full scale. This sustains constant-frequency operation and avoids efficiency collapse and acoustic noise associated with Burst Mode - confirmed by typical performance curves showing >80% efficiency at 35mA (1% of 3.5A).
Can the LTC1539CGW#PBF be synchronized to an external clock source?
Yes. The LTC1539CGW#PBF includes a dedicated PLLIN pin and PLL LPF pin enabling full phase-lock synchronization to an external clock. When PLLIN receives a clean square wave, the internal oscillator locks to it with ±30% frequency range adjustment via PLL LPF voltage (0–2.4V), eliminating beat frequencies in multi-converter systems.
What is the function of the EXTVCC pin on the LTC1539CGW#PBF?
The EXTVCC pin on the LTC1539CGW#PBF serves as an external power input to bypass the internal 5V LDO. When voltage at EXTVCC exceeds 4.7V, an internal switch connects it to INTVCC, reducing power loss and thermal stress - commonly tied to the 5V output rail for higher overall system efficiency.
LTC1539CGW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-BSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1539CGW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1539CGW#PBF 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#PBF reliable?
The price and inventory of LTC1539CGW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1539CGW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1539CGW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1539CGW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1539CGW#PBF?
LTC1539CGW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1539CGW#PBF 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#PBF?
For technical support, including LTC1539CGW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1539CGW#PBF requirements.
6.How does Aetrix verify that LTC1539CGW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1539CGW#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1539CGW#PBF?
All LTC1539CGW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1539CGW#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1539CGW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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