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Analog Devices Inc. LTC3600EDD#PBF
- Part No.:
- LTC3600EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3600EDD#PBF.pdf
- Description:
- IC REG BUCK PROG 1.5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,590
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Product details
Overview
LTC3600EDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with single-resistor output voltage programming, 1.5A output current capability, and 4V–15V input range. It employs constant on-time current-mode control, supports 200kHz–4MHz adjustable switching frequency, and delivers up to 96% efficiency in point-of-load applications such as portable instrumentation and distributed power systems.
For engineers reviewing the LTC3600EDD#PBF datasheet, LTC3600EDD#PBF pinout, LTC3600EDD#PBF application, or LTC3600EDD#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to the 12-lead 3mm × 3mm DFN, real-world load transient behavior, and two rigorously cross-checked alternative parts for design flexibility.
Technical Context
The LTC3600EDD#PBF implements a current-mode architecture with an internal 50µA ISET current source enabling precise VOUT programming via one external resistor. Its error amplifier directly compares VOUT to ISET voltage in unity-gain configuration, ensuring tight regulation independent of output voltage level.
It features programmable switching frequency (200kHz–4MHz) via RT pin, selectable operation modes (CCM/DCM) via MODE/SYNC pin, and integrated overvoltage/undervoltage protection on PGFB with 7.5% window tolerance. The device uses internal top/bottom NMOS switches with RDS(ON) of 200mΩ/100mΩ and supports soft-start via ISET capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 15V - supports dual Li-ion battery, 5V, and 12V input rails without external LDO pre-regulation. |
| IOUT Max | 1.5A continuous - sufficient for FPGA core supplies, microcontroller SoCs, and sensor interface rails. |
| fSW Range | 200kHz to 4MHz - enables use of sub-3mm inductors (e.g., 2.2µH at 1MHz) and reduces output capacitance requirements. |
| ISET Accuracy | ±1% (49.5µA to 50.5µA) - ensures ±1% VOUT programming accuracy across temperature and line conditions. |
| Efficiency | Up to 96% at 12VIN/2.5VOUT/1A - minimizes thermal stress in thermally constrained DFN packages. |
| Shutdown IQ | 1.5µA - enables ultra-low-power system sleep states without external enable circuitry. |
| VOUT Range | 0V to VIN – 0.5V - supports low-voltage logic rails (e.g., 0.8V, 1.2V, 1.8V) and tracking applications. |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 13 = GND). Thermally enhanced layout requires soldering the exposed pad to PCB ground plane for θJA = 55°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET (1) | 50µA current source / EA+ input | Single-resistor VOUT programming node; also enables soft-start when capacitor is added. |
| ITH (2) | Error amplifier output / compensation node | Controls valley current threshold; internal compensation enabled by tying to INTVCC. |
| RT (3) | Oscillator frequency programming | Resistor-to-GND sets fSW from 200kHz–4MHz; tie to INTVCC for fixed 1MHz operation. |
| PGFB (4) | Power good feedback divider input | Detects VOUT regulation status (0.555V–0.645V window); tie to INTVCC to disable PGOOD. |
| RUN (5) | Enable control with hysteresis | 1.55V turn-on threshold; <1V disables regulator; <0.4V shuts down entire IC including bias circuits. |
| MODE/SYNC (6) | Operation mode select / external clock input | Tie to GND for DCM; to INTVCC for forced CCM; apply external clock for synchronization (±30% range). |
| SW (7) | Switch node | Connects to inductor; swings from ~–0.3V to VIN; requires low-inductance layout to minimize ringing. |
| VIN (8) | Main input supply | 4V–15V input; must be decoupled with ≥22µF ceramic capacitor placed adjacent to pin. |
| BOOST (9) | Bootstrap supply for top MOSFET gate driver | Swings from ~INTVCC–0.3V to VIN+INTVCC; requires 0.1µF ceramic bootstrap capacitor. |
| INTVCC (10) | Internal 5V LDO output | Powers gate drivers and control logic; bypass with ≥1µF low-ESR ceramic to GND. |
| VOUT (11) | Regulated output / EA− input | Unity-gain feedback node; directly tracks ISET voltage; connects to output capacitor and load. |
| PGOOD (12) | Open-drain power-good indicator | Pulled low if PGFB exits 0.555V–0.645V window; includes 20µs blanking delay to suppress transient glitches. |
| GND (13) | Power and signal ground / thermal pad | Return path for both power MOSFETs; exposed pad must be soldered to PCB ground for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor VOUT programming | Eliminates feedback divider network-reduces BOM count, layout area, and resistor matching errors. |
| ±1% ISET current accuracy | Ensures ±1% output voltage accuracy without trimming, even across –40°C to 125°C junction temperature. |
| Adjustable 200kHz–4MHz switching frequency | Enables optimization between efficiency (low fSW), size (high fSW), and EMI compliance (spread-spectrum sync). |
| Internal 5V INTVCC regulator | Removes need for external bias supply; supports up to 50mA RMS load while maintaining stable gate drive. |
| Discontinuous/Continuous mode selection | DCM at light loads improves light-load efficiency; CCM forced via MODE/SYNC pin for predictable transient response. |
| Integrated VIN overvoltage lockout | Shuts down at VIN >17.5V and resumes at VIN <16V-protects internal NMOS switches from transient spikes. |
Applications
| Point-of-Load Power Supply | Voltage Tracking Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 1.2V/1.8V/3.3V rails to FPGA I/O banks or ASIC cores near the load. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated output with fast load transient response. Use Value: Achieves <100mV droop under 1A step load (20µs/div waveform data) due to current-mode control and low minimum off-time (130ns). |
Use Scenario: Matching startup ramp rate of multiple power rails (e.g., core + I/O) using shared ISET soft-start capacitor. IC Role / Device Role / Timing Role: Voltage tracker via ISET pin voltage servoing-VOUT follows externally driven ISET reference. Use Value: Enables monotonic power-up sequencing without external supervisors; supports pre-biased output startup. |
| Portable Instrumentation | Distributed Power System |
|
Use Scenario: Battery-powered handheld test equipment requiring high efficiency across wide load range (1mA–1.5A). IC Role / Device Role / Timing Role: Main DC/DC converter operating in DCM at light loads and CCM at full load to maximize efficiency. Use Value: Delivers >90% efficiency at 10mA load (G05 curve) and maintains <1.5µA shutdown current for extended battery life. |
Use Scenario: Modular power architecture where multiple LTC3600EDD#PBF units supply isolated subsystems (e.g., comms, sensing, processing). IC Role / Device Role / Timing Role: Paralleled synchronous buck regulator-enabled by sharing RUN and MODE/SYNC signals. Use Value: Supports current sharing and thermal spreading across multiple DFN packages without external current-sense resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EDD#PBF | Higher 2A output current; same 4V–15V VIN range; identical 12-pin DFN package and pinout. | Required when load exceeds 1.5A or higher thermal margin is needed; shares same PCB footprint. | Select when scaling output current without redesigning layout-pin-compatible upgrade path. |
| TPS54331DR | 3.5V–28V VIN range; 3A output; fixed 570kHz fSW; requires feedback divider; no ISET programming. | Suitable for higher-input industrial rails (e.g., 24V bus); lacks single-resistor VOUT tuning and tracking capability. | Choose for wider input range and higher current where programmability and soft-start simplicity are secondary. |
Compared with LTC3600EDD#PBF, LTC3630EDD#PBF offers direct pin-compatible current scaling, while TPS54331DR trades single-resistor simplicity for broader input voltage support and higher output current-but requires full feedback network redesign and loses ISET-based tracking functionality.
Availability
LTC3600EDD#PBF is available at Aetrix Electronics and suitable for point-of-load power supplies, voltage tracking systems, portable instrumentation, and distributed power architectures requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.
Supply support for LTC3600EDD#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3600EDD#PBF belongs to Linear's high-efficiency monolithic buck regulator family, designed specifically for space-constrained, high-transient-response applications where single-resistor programming, wide VOUT range, and thermal robustness in DFN packages are critical.
FAQ
What is the maximum output voltage range supported by the LTC3600EDD#PBF?
The LTC3600EDD#PBF supports an output voltage range from 0V up to VIN – 0.5V. With its 4V–15V input range, this enables programmable outputs from 0V to 14.5V. The ISET pin's accurate 50µA current source allows precise setting using a single external resistor, and the error amplifier operates in unity-gain configuration to maintain tight regulation across the full range. This makes the LTC3600EDD#PBF suitable for low-voltage logic rails and high-side tracking applications.
How does the LTC3600EDD#PBF achieve single-resistor output voltage programming?
The LTC3600EDD#PBF achieves single-resistor programming via its internal 50µA ISET current source. Connecting an external resistor RSET from ISET (Pin 1) to GND generates a voltage VISET = 50µA × RSET, which becomes the regulation reference. Since the error amplifier forces VOUT to equal VISET, the output voltage is directly set by RSET. This eliminates feedback dividers, reduces component count, and avoids resistor ratio errors-confirmed by ±1% ISET accuracy over temperature in the Electrical Characteristics table.
Can the LTC3600EDD#PBF operate in discontinuous conduction mode (DCM)?
Yes, the LTC3600EDD#PBF automatically enters DCM at light loads when inductor current drops to zero and reverses. This is detected by the internal current reversal comparator (IREV), which disables the bottom MOSFET. DCM improves light-load efficiency and is enabled by default. To force continuous conduction mode (CCM) regardless of load, tie the MODE/SYNC pin (Pin 6) to INTVCC. This ensures predictable transient response and eliminates low-frequency ripple in noise-sensitive applications.
What thermal considerations apply to the LTC3600EDD#PBF in its 3mm × 3mm DFN package?
The LTC3600EDD#PBF in the 12-lead DFN package has θJA = 55°C/W when the exposed thermal pad (Pin 13) is properly soldered to a PCB ground plane. Junction temperature must remain ≤125°C. For example, at 12VIN/3.3VOUT/1.5A with 94% efficiency, power dissipation is ~0.32W, resulting in ~17.6°C rise above ambient. Adequate copper area under the pad and optional thermal vias are essential-failure to solder the pad degrades thermal performance significantly and risks thermal shutdown.
Does the LTC3600EDD#PBF support external clock synchronization?
Yes, the LTC3600EDD#PBF supports external clock synchronization via the MODE/SYNC pin (Pin 6). When an external clock signal is applied, the internal phase-locked loop locks the switching frequency to that clock within ±30% of the free-running frequency set by the RT resistor. This enables EMI reduction through frequency dithering or alignment with system clocks. The datasheet specifies that the RT value must be selected so the free-running frequency is within 30% of the external clock to ensure reliable locking.
LTC3600EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- 14.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LTC3600EDD#PBF FAQ
1.How can I place an order for LTC3600EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3600EDD#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 LTC3600EDD#PBF reliable?
The price and inventory of LTC3600EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3600EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3600EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3600EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3600EDD#PBF?
LTC3600EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3600EDD#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 LTC3600EDD#PBF?
For technical support, including LTC3600EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3600EDD#PBF requirements.
6.How does Aetrix verify that LTC3600EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3600EDD#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 LTC3600EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3600EDD#PBF?
All LTC3600EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3600EDD#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 LTC3600EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3600EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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