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Analog Devices Inc. LTC3600IDD#PBF
- Part No.:
- LTC3600IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3600IDD#PBF.pdf
- Description:
- IC REG BUCK PROG 1.5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,041
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Product details
Overview
LTC3600IDD#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 adjustable switching frequency from 200kHz to 4MHz. It operates from 4V to 15V input, delivers rail-to-rail VOUT (0V to VIN – 0.5V), and features ±1% ISET current accuracy for precise regulation in point-of-load power supplies.
For engineers reviewing the LTC3600IDD#PBF datasheet, LTC3600IDD#PBF pinout, LTC3600IDD#PBF application, or LTC3600IDD#PBF equivalent, key selection considerations include its constant-on-time architecture for fast transient response, internal 5V INTVCC regulator, PGOOD monitoring with 7.5% window, and thermally enhanced 12-lead 3mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3600IDD#PBF implements current-mode control with an accurate 50µA ISET current source enabling unity-gain VOUT feedback. Its constant-on-time architecture synchronizes switching frequency to an external clock or RT-resistor setting, supporting high-frequency operation up to 4MHz for compact magnetics.
It integrates top and bottom NMOS power switches (200mΩ/100mΩ RDS(ON)), features programmable MODE/SYNC for CCM/DCM selection or external synchronization, and includes overvoltage lockout (16V VIN OV), thermal shutdown, and zero-current detection for discontinuous mode operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 15V - supports dual Li-ion, 5V, and 12V input rails without external biasing |
| IOUT Max | 1.5A - continuous output current with integrated 200mΩ/100mΩ NMOS switches |
| fSW Range | 200kHz to 4MHz - set by RT resistor or synchronized externally; enables small inductor selection |
| ISET Accuracy | ±1% (49.5µA to 50.5µA) - ensures tight VOUT regulation independent of output voltage level |
| Efficiency | Up to 96% - achieved via synchronous rectification and low RDS(ON) power switches |
| Shutdown IQ | 1.5µA - near-zero quiescent current in shutdown, critical for battery-powered systems |
| Package | 12-lead 3mm × 3mm DFN with exposed GND pad - θJA = 55°C/W for robust thermal performance |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed GND pad (Pin 13), rated for –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISET (1) | Programmable reference current source | 50µA sink; connects to GND via RSET to set VOUT = ISET × RSET; also enables soft-start with capacitor |
| ITH (2) | Error amplifier output / compensation node | Controls valley current threshold; tied to INTVCC for internal compensation or externally filtered for OPTI-LOOP® optimization |
| RT (3) | Frequency programming input | Resistor to GND sets fSW from 200kHz–4MHz; tie to INTVCC for fixed 1MHz operation |
| PGFB (4) | Power good feedback input | Monitors VOUT via resistor divider; asserts PGOOD when PGFB = 0.555V–0.645V (7.5% window) |
| RUN (5) | Enable/shutdown control | >1.55V enables full operation; <1V disables switching; <0.4V shuts down entire IC |
| MODE/SYNC (6) | Operation mode or sync 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 |
| VIN (8) | Main input supply | 4V–15V input; must be decoupled with ≥22µF ceramic capacitor close 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 control circuitry and gate drivers; bypass with ≥1µF ceramic to GND; max 50mA RMS load |
| VOUT (11) | Regulated output | Feedback node tied directly to error amp negative input; equals ISET voltage in unity-gain configuration |
| PGOOD (12) | Open-drain power-good indicator | Pulled low when VOUT out-of-regulation; requires external pull-up to INTVCC or other rail |
| GND (13) | Power and signal ground | Exposed pad - must be soldered to PCB ground plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor VOUT programming | Eliminates feedback divider; reduces BOM count and layout sensitivity while maintaining ±1% accuracy |
| Wide VOUT range (0V to VIN – 0.5V) | Enables ultra-low output voltages (e.g., 10mV minimum) and tracking applications without external op-amps |
| Adjustable 200kHz–4MHz switching frequency | Supports optimized trade-offs between efficiency, size, and EMI; allows use of sub-2mm height inductors |
| Constant-on-time architecture | Delivers <10µs load transient response in CCM; maintains stable frequency under line/load variation |
| Thermally enhanced DFN package | 3mm × 3mm footprint with exposed GND pad achieves 55°C/W θJA, enabling 1.5A operation at 70°C ambient |
Applications
| Voltage Tracking Supplies | Point-of-Load Power Supplies |
|---|---|
Use Scenario: Sequencing multiple rails (e.g., FPGA core, I/O, auxiliary) with matched ramp rates during power-up/down. IC Role / Device Role / Timing Role: LTC3600IDD#PBF acts as a precision tracking regulator, where VOUT follows an external reference applied to ISET. Use Value: Eliminates need for dedicated tracking ICs or complex resistor networks; achieves <1% tracking error across temperature and load. | Use Scenario: Providing clean, regulated 1.2V/1.8V/3.3V power directly to ASICs, microcontrollers, or memory in space-constrained industrial modules. IC Role / Device Role / Timing Role: LTC3600IDD#PBF serves as primary buck converter with integrated power switches and internal compensation. Use Value: Reduces solution size by >40% vs. controller + external FETs; supports 1MHz operation with 2.2µH inductor and 22µF ceramic output cap. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Battery-powered handheld test equipment requiring low-noise, high-efficiency conversion from 7.4V Li-Po to 3.3V/5V system rails. IC Role / Device Role / Timing Role: LTC3600IDD#PBF operates in DCM at light loads to maintain >85% efficiency down to 1mA, extending battery life. Use Value: Zero-supply-current shutdown and 1.5µA IQ enable >1-year shelf life; PGOOD ensures safe processor reset sequencing. | Use Scenario: Telecom line cards with multiple isolated DC/DC stages needing reliable, thermally robust local regulation. IC Role / Device Role / Timing Role: LTC3600IDD#PBF functions as secondary-side synchronous buck delivering 1.5A at 12V input, with SYNC pin daisy-chained to master clock. Use Value: External clock synchronization eliminates beat frequencies and simplifies EMI filtering across multiple converters. |
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 |
|---|---|---|---|
| TPS54302DDAR | Fixed 500kHz fSW, no ISET programming; uses resistive divider feedback; 3.5V–28V VIN | Less flexible VOUT adjustment; higher minimum VIN limits use in dual-cell Li-ion systems | Select when fixed frequency and wide VIN range outweigh single-resistor simplicity |
| MP2315DJ-LF-Z | 3.3V–17V VIN, 2A rating, but only ±2% FB reference; no PGOOD or SYNC; 8-pin SOIC package | Lacks power-good monitoring and external synchronization; larger thermal resistance (θJA ≈ 90°C/W) | Select for cost-sensitive, non-critical applications where board space and thermal margin allow |
Compared with TPS54302DDAR and MP2315DJ-LF-Z, the LTC3600IDD#PBF offers superior VOUT programming flexibility via ISET, tighter reference accuracy (±1% vs ±2%), integrated PGOOD with hysteresis, and lower thermal resistance in its 3mm × 3mm DFN - making it preferred for precision, space-constrained, or thermally demanding designs.
Availability
LTC3600IDD#PBF is available at Aetrix Electronics and suitable for point-of-load power supplies, portable instrumentation, voltage tracking systems, and distributed power architectures requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3600IDD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3600IDD#PBF belongs to Linear's high-efficiency monolithic buck regulator product line, designed specifically for compact, high-transient-response point-of-load applications where simplicity, accuracy, and thermal performance are critical.
FAQ
What is the maximum output current supported by the LTC3600IDD#PBF?
The LTC3600IDD#PBF supports a continuous output current of 1.5A, enabled by its integrated 200mΩ top and 100mΩ bottom NMOS power switches. This rating assumes proper PCB thermal design - including soldering the exposed GND pad - and operation within the specified –40°C to 125°C junction temperature range. Derating applies above 70°C ambient depending on airflow and copper area.
How does the LTC3600IDD#PBF achieve single-resistor output voltage programming?
The LTC3600IDD#PBF uses an accurate internal 50µA current source on the ISET pin. Connecting an external resistor RSET from ISET to GND sets VOUT = 50µA × RSET, with ±1% accuracy over temperature and line. The VOUT pin feeds directly into the error amplifier's negative input, creating a unity-gain buffer configuration - eliminating feedback dividers and associated resistor tolerance errors.
Can the LTC3600IDD#PBF operate with a 3.3V input supply?
No - the LTC3600IDD#PBF has a minimum input voltage of 4V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4V is not guaranteed and may result in UVLO activation or failure to regulate. For 3.3V-input applications, consider alternatives such as the LTC3633 or MP2307, which support lower VIN ranges.
What is the purpose of the MODE/SYNC pin on the LTC3600IDD#PBF?
The MODE/SYNC pin on the LTC3600IDD#PBF serves three functions: (1) tie to GND for discontinuous conduction mode (DCM) at light loads, (2) tie to INTVCC for forced continuous conduction mode (CCM) regardless of load, or (3) apply an external clock signal (within ±30% of RT-set frequency) to synchronize switching. This pin directly controls operating mode and EMI profile without changing external components.
Does the LTC3600IDD#PBF include overvoltage protection on the input supply?
Yes - the LTC3600IDD#PBF includes dedicated VIN overvoltage protection that triggers at 16V (rising) and releases at 15V (falling). When activated, it suspends switching, turns off both power MOSFETs, and discharges the ISET pin to prevent uncontrolled VOUT rise. This protects internal circuitry and downstream components from transient spikes common in automotive or industrial 12V systems.
LTC3600IDD#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)
LTC3600IDD#PBF FAQ
1.How can I place an order for LTC3600IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3600IDD#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 LTC3600IDD#PBF reliable?
The price and inventory of LTC3600IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3600IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3600IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3600IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3600IDD#PBF?
LTC3600IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3600IDD#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 LTC3600IDD#PBF?
For technical support, including LTC3600IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3600IDD#PBF requirements.
6.How does Aetrix verify that LTC3600IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3600IDD#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 LTC3600IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3600IDD#PBF?
All LTC3600IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3600IDD#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 LTC3600IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3600IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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