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Analog Devices Inc. LT3500EDD#TRPBF
- Part No.:
- LT3500EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3500EDD#TRPBF.pdf
- Description:
- IC REG DL BUCK/LINEAR 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,369
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Product details
Overview
LT3500EDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down DC/DC converter with integrated linear regulator controller, operating from 3V to 36V input and delivering adjustable output down to 0.8V. It features current-mode PWM control, 250kHz–2.2MHz resistor-programmable switching frequency, soft-start/tracking, and power-good monitoring - used in automotive battery regulation and industrial distributed power systems.
For engineers reviewing the LT3500EDD#TRPBF datasheet, LT3500EDD#TRPBF pinout, LT3500EDD#TRPBF application, or LT3500EDD#TRPBF equivalent, key selection considerations include its dual-regulator architecture (buck + linear driver), 12μA shutdown current, thermally enhanced 3mm × 3mm DFN-12 package, and guaranteed –40°C to 125°C operation.
Technical Context
The LT3500EDD#TRPBF integrates a 2.3A NPN switch with current-mode control, cycle-by-cycle current limiting, and frequency foldback for short-circuit protection. Its dual feedback paths support independent regulation of the main buck output (FB pin, 0.8V reference) and linear regulator output (LFB pin, 0.8V reference), both trackable via the SS pin.
It employs an internal transconductance error amplifier (150–350 μmho), programmable oscillator with RT/SYNC pin (250kHz–2.2MHz), and dual open-collector PG/PG outputs with 30mV hysteresis. The BST pin enables bootstrapped gate drive for low VCE(sat), while the exposed pad serves as sole GND connection with θJA = 45°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V operating; 40V absolute max - supports automotive batteries and unregulated 24V industrial rails without external pre-regulation. |
| Switch Current Limit | 2.3A typical peak (DD package) - enables 2A continuous output with margin for transient loads and thermal derating. |
| Feedback Reference | 0.8V ±2% over temperature - sets precise output voltage with standard resistor dividers; applies identically to FB and LFB pins. |
| Shutdown Current | 12μA typical - allows ultra-low-power sleep mode in battery-powered systems without auxiliary enable circuitry. |
| Switching Frequency | 250kHz to 2.2MHz, resistor- or sync-programmable - balances efficiency vs. size: higher frequencies shrink inductors/capacitors but increase switching losses. |
| Package | 12-lead 3mm × 3mm DFN with exposed GND pad - provides low thermal resistance (θJC(PAD) = 10°C/W) for high-power density layouts. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
LT3500EDD#TRPBF is housed in a thermally enhanced 12-lead (3mm × 3mm) plastic DFN package with exposed GND pad (Pin 13), which must be soldered to PCB for thermal and electrical performance. Pin numbering follows top-view layout with SW, BST, LDRV, LFB, FB, PG, VIN, SHDN, SS, PG, VC, RT/SYNC arranged clockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Powers internal bias circuits and connects to collectors of internal NPN switch and linear driver; requires local high-frequency decoupling. |
| SW | Switch emitter | Connects to inductor and catch diode; experiences high dV/dt during turn-off - demands tight layout to ground return path. |
| BST | Bootstrap supply | Drives internal NPN base above VIN via external capacitor/diode; minimum 2.2V boost voltage required for full saturation. |
| FB | Buck feedback input | Negative input of buck error amplifier; regulated to 0.8V - sets main output voltage via resistor divider. |
| LFB | Linear feedback input | Negative input of linear regulator error amplifier; also regulated to 0.8V - enables tracking or independent linear output control. |
| LDRV | Linear driver output | Emitter of internal NPN; delivers up to 13mA; can drive external pass transistor for higher-current linear regulation. |
| SHDN | Enable/disable control | Active-high logic input; 0.76V threshold with hysteresis - functions as precise undervoltage lockout or system enable signal. |
| SS | Soft-start/tracking | Controls ramp rate of both buck and linear outputs via external capacitor; enables output sequencing and inrush current limiting. |
| PG / PG | Power-good status | Complementary open-collector outputs; assert when FB and LFB exceed 90% of 0.8V - provide fault signaling and sequencing control. |
| VC | Error amplifier output | Transconductance amplifier output; drives peak current comparator - used for loop compensation, current clamping, or override control. |
| RT/SYNC | Frequency control | Configures oscillator via resistor-to-ground (250kHz–2.2MHz) or accepts external sync clock on rising edge - maintains slope compensation during sync. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output regulation | Simultaneous buck (2A) and linear (13mA) outputs with shared soft-start and shutdown - simplifies multi-rail power sequencing in compact systems. |
| Programmable frequency | 250kHz–2.2MHz range via single RT resistor - enables optimization of magnetic component size, EMI profile, and light-load efficiency. |
| Tracking soft-start | Single SS capacitor controls ramp rate of both outputs - ensures controlled startup and prevents cross-conduction in cascaded regulators. |
| Robust protection suite | Cycle-by-cycle current limit, thermal shutdown, frequency foldback, and short-circuit protection across full input range - eliminates need for external fault management circuitry. |
| Low-quiescent operation | 12μA shutdown current and 2.5–3.5mA quiescent current - extends battery life in always-on or intermittent-use applications. |
Applications
| Automotive Battery Regulation | Industrial Control Power |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to stable 5V/3.3V for infotainment MCU and sensors under cold-crank (down to 3V) and load-dump (up to 40V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator with linear post-regulator for noise-sensitive analog supplies; PG signals system controller upon valid rail establishment. Use Value: Wide 3V–36V input range and 40V abs-max rating ensure uninterrupted operation during automotive transients without external TVS or pre-regulators. | Use Scenario: Generating isolated 3.3V and 5V rails from unregulated 24V factory floor supply for PLC I/O modules and fieldbus interfaces. IC Role / Device Role / Timing Role: Dual-output DC/DC converter providing primary digital rail and clean linear-supplied analog reference; RT/SYNC pin enables synchronization to system clock to reduce beat frequencies. Use Value: Adjustable frequency avoids EMI-sensitive bands; 12μA shutdown enables remote wake-up capability in low-power monitoring nodes. |
| Wall Transformer Regulation | Distributed Power Regulation |
Use Scenario: Replacing linear regulators in AC/DC adapter secondary side to improve efficiency and reduce heat in space-constrained consumer electronics enclosures. IC Role / Device Role / Timing Role: Step-down converter with integrated linear controller powering mixed-signal SoCs; SS pin enables smooth transition from standby to active mode. Use Value: 2A output capability and 0.8V reference allow direct generation of core voltages for modern processors without external DACs or LDOs. | Use Scenario: Providing point-of-load regulation for FPGA I/O banks and memory interfaces in telecom line cards where board area and thermal budget are constrained. IC Role / Device Role / Timing Role: Compact dual-regulator solution delivering tightly tracked 1.2V and 2.5V rails; exposed pad minimizes thermal resistance in high-density multilayer PCBs. Use Value: 3mm × 3mm DFN package reduces footprint by >50% vs. discrete buck+LDO solutions; PG outputs coordinate power-up sequence with FPGA configuration logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC/DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | Monolithic 2A buck only (no integrated linear regulator); 3.5V–40V input; 1.2MHz fixed frequency; MSOP-16 package. | Lacks LDRV/LFB functionality - requires external LDO for second rail; simpler for single-output needs. | Select when only buck regulation is needed and board space allows separate LDO; not suitable for tracking or linear post-regulation. |
| TPS54202DDCR | 2A buck converter with integrated FETs; 4.5V–28V input; 500kHz–2.2MHz sync-capable; 6-pin SOT-23 package. | No linear regulator section or PG/PG outputs; lower input voltage range limits automotive use. | Choose for cost-sensitive, single-rail applications with moderate input range; lacks dual-output coordination and fault signaling. |
Compared with LTC3631EMSE#PBF and TPS54202DDCR, the LT3500EDD#TRPBF uniquely integrates buck + linear regulation with tracking, power-good signaling, and extended 3V–36V operation - making it optimal for space-constrained dual-rail systems requiring coordinated startup and robust transient handling.
Availability
LT3500EDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control power, and wall transformer regulation requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to +125°C operation.
Supply support for LT3500EDD#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, formed through the acquisition of Linear Technology in 2017.
The LT3500EDD#TRPBF belongs to ADI's Power by Linear™ portfolio of highly integrated DC/DC converters, designed specifically for demanding industrial, automotive, and communications applications requiring wide input range, high reliability, and minimal external components.
FAQ
What is the maximum output current capability of the LT3500EDD#TRPBF?
The LT3500EDD#TRPBF supports up to 2A continuous output from its integrated buck converter, based on a 2.3A typical peak switch current rating in the DFN-12 package. The linear regulator section (LDRV) delivers up to 13mA. Actual achievable current depends on input voltage, ambient temperature, PCB copper area, and thermal design - full 2A operation is verified at 125°C junction temperature with proper heatsinking via the exposed pad.
Does the LT3500EDD#TRPBF support synchronization to an external clock?
Yes, the LT3500EDD#TRPBF supports external clock synchronization via the RT/SYNC pin. When driven with a TTL/CMOS-compatible square wave (250kHz–2.2MHz), the internal oscillator locks to the rising edge of the input signal. Slope compensation automatically adjusts to prevent subharmonic oscillation. If the external clock stops, the device reverts to resistor-programmed mode after timeout.
What is the purpose of the LDRV and LFB pins on the LT3500EDD#TRPBF?
The LDRV pin is the emitter of an internal NPN transistor, configurable as either a 13mA linear regulator output or a driver for an external high-current pass transistor. The LFB pin is its feedback input, regulated to the same 0.8V reference as the main FB pin - enabling independent or tracked linear regulation alongside the buck output, with coordinated soft-start via the SS pin.
How does the power-good (PG/PG) function work on the LT3500EDD#TRPBF?
The LT3500EDD#TRPBF features complementary open-collector PG and PG outputs that assert when both FB and LFB voltages exceed 90% of their 0.8V reference (i.e., >0.72V). PG sinks current when active; PG sources current when active. Hysteresis of 30mV prevents chatter near threshold. These signals are disabled during shutdown, thermal fault, or VIN undervoltage lockout.
Can the LT3500EDD#TRPBF operate from a 3V input supply?
Yes, the LT3500EDD#TRPBF is specified to operate from 3V to 36V input. Its minimum functional input is ~2.8V (per datasheet Note 3), sufficient to power internal bias circuits and maintain regulation. At 3V input, the achievable output voltage is limited by dropout - e.g., a 2.5V output requires careful inductor selection and may operate in pulse-skipping mode at light loads.
LT3500EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 500kHz ~ 2.4MHz
- Voltage/Current - Output 1:
- 0.8V ~ 38.9V, 2A
- Voltage/Current - Output 2:
- Adjustable, 13mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3V ~ 36V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LT3500EDD#TRPBF FAQ
1.How can I place an order for LT3500EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3500EDD#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 LT3500EDD#TRPBF reliable?
The price and inventory of LT3500EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3500EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3500EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3500EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3500EDD#TRPBF?
LT3500EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3500EDD#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 LT3500EDD#TRPBF?
For technical support, including LT3500EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3500EDD#TRPBF requirements.
6.How does Aetrix verify that LT3500EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3500EDD#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 LT3500EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3500EDD#TRPBF?
All LT3500EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3500EDD#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 LT3500EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3500EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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