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Analog Devices Inc. LTC3632IDD#PBF
- Part No.:
- LTC3632IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3632IDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 20MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,773
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Product details
Overview
LTC3632IDD#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, synchronous step-down DC/DC converter IC with integrated high-side and low-side MOSFETs, delivering up to 20mA output current from a 4.5V–50V input, featuring 12µA no-load quiescent current, 0.8V ±1% feedback reference, and programmable peak current limit (10–50mA). It is used in industrial control supplies and battery-operated instrumentation requiring ultra-low power regulation.
For engineers reviewing the LTC3632IDD#PBF datasheet, LTC3632IDD#PBF pinout, LTC3632IDD#PBF application, or LTC3632IDD#PBF equivalent, key selection criteria include input voltage range (4.5V–50V), guaranteed operation at –40°C to 125°C, DFN-8 (3mm × 3mm) thermal performance, and Burst Mode® efficiency optimization across microamp-to-20mA loads.
Technical Context
The LTC3632IDD#PBF implements a hysteretic Burst Mode® control architecture with internal 0.8V feedback comparator (±1% tolerance, 5mV hysteresis), enabling automatic transition between active switching bursts and 12µA sleep mode. Its peak current limit is set via external resistor on ISET pin (10–50mA range), directly determining maximum average output current (up to 25mA).
Startup is controlled by a precise RUN pin threshold (1.21V rising, 1.10V falling, 110mV hysteresis), supported by internal 0.75ms soft-start and optional external SS capacitor. Input protection includes undervoltage lockout (UVLO: 4.15V rise / 4.00V fall) and overvoltage lockout (OVLO: 56V rise / 54V fall), sustaining 60V surges without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports wide-range industrial, automotive, and battery-derived inputs without external pre-regulation. |
| Output Current | Up to 20mA - sufficient for powering precision sensors, ADCs, and low-power microcontrollers in distributed systems. |
| No-Load Quiescent Current | 12µA typical - enables multi-year battery life in always-on remote monitoring devices. |
| Feedback Reference | 0.8V ±1% - ensures accurate output voltage setting (e.g., 3.3V ±1.5%) across temperature and line variations. |
| Peak Current Limit | Programmable 10–50mA via ISET resistor - allows optimization of inductor size, ripple, and efficiency for specific load profiles. |
| Overvoltage Protection | 60V surge tolerance - eliminates need for external TVS diodes in harsh environments like automotive transients. |
| Operating Temperature | –40°C to 125°C junction - qualified for industrial and under-hood automotive applications without derating. |
Pinout & Package
The LTC3632IDD#PBF is housed in an 8-lead, 3mm × 3mm plastic DFN package with exposed GND pad (Pin 9) requiring PCB soldering for thermal and electrical integrity. Thermal resistance θJA = 43°C/W, θJC = 3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries pulsed current from internal high-side P-MOSFET and low-side N-MOSFET. |
| VIN (Pin 2) | Main supply input | Accepts 4.5V–50V input; requires local 1µF ceramic bypass to GND for stability and EMI suppression. |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak inductor current (10–50mA), defining max output capability and component sizing. |
| SS (Pin 4) | Soft-start control | Sources 5.5µA; external capacitor sets ramp time (default 0.75ms internal) to limit inrush and input droop. |
| RUN (Pin 5) | Enable/disable control | Logic-level enable: >1.21V starts regulation; <0.7V shuts down to 3µA, supporting system-level power sequencing. |
| VFB (Pin 6) | Feedback input | Compares divided output voltage to 0.8V reference; determines regulation accuracy and loop stability. |
| HYST (Pin 7) | Run hysteresis open-drain | Pulled low when RUN is inactive; enables adjustable UVLO using external resistive divider from VIN. |
| GND (Pins 8 & 9) | Ground reference | Pins 8 (bond pad) and 9 (exposed thermal pad) must be connected to solid PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >85% efficiency at 100µA load while drawing only 12µA quiescent current - critical for energy harvesting and battery longevity. |
| Integrated power switches | Internal high-side P-MOSFET and low-side N-MOSFET eliminate external FETs and gate drivers - reduces BOM count and layout complexity. |
| No compensation required | Hysteretic control loop needs no external compensation components - simplifies design and improves robustness across input/output conditions. |
| Low dropout operation | 100% duty cycle capability - enables regulation down to VOUT ≈ VIN − 0.2V, useful for brownout recovery and wide-input tracking. |
| Precise RUN threshold with hysteresis | 1.21V/1.10V thresholds with 110mV hysteresis - ensures clean, bounce-free power-up and prevents oscillation near enable threshold. |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Node Power |
|---|---|
Use Scenario: Regulating 5V/20mA for a 4–20mA loop-powered transmitter operating from 12–48V field wiring. IC Role / Device Role / Timing Role: Primary step-down regulator supplying analog front-end, DAC, and current-sense amplifier with stable, low-noise 5V rail. Use Value: 12µA quiescent current minimizes loop error at 4mA; 50V input rating handles cable drop and surge events per IEC 61000-4-5. | Use Scenario: Powering a wireless sensor node (MCU + RF + temp/humidity sensor) from a single LiSOCl₂ cell or energy harvester. IC Role / Device Role / Timing Role: Ultra-low-power buck converter maintaining regulated 3.3V output during intermittent wake cycles. Use Value: Burst Mode® extends battery life beyond 10 years; programmable 10mA peak current allows smallest possible inductor (220µH) and footprint. |
| Automotive Body Control Module | Portable Test Instrument |
Use Scenario: Providing 3.3V bias for CAN transceivers and microcontrollers in under-dash modules exposed to 60V load dump. IC Role / Device Role / Timing Role: Input-protected primary regulator handling cold-crank (4.5V) to load-dump (60V) transients without shutdown. Use Value: Integrated 60V surge tolerance and 54V OVLO eliminate need for external TVS, reducing cost and board area in space-constrained modules. | Use Scenario: Supplying 5V/15mA to precision op-amps and reference buffers in handheld multimeters or oscilloscope probes. IC Role / Device Role / Timing Role: High-accuracy, low-noise power source ensuring stable reference voltage and minimal measurement drift. Use Value: 0.8V ±1% feedback reference and <5mV comparator hysteresis enable <0.5% output voltage error across temperature and line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, low-quiescent-current step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631IDD#PBF | Same 4.5V–50V input, but fixed 100mA output; higher IQ (25µA); no programmable peak current. | Designed for higher-current loads (e.g., motor drivers); lacks fine-tuned efficiency optimization for µA–mA range. | Select when >20mA output is required and programmability is not needed. |
| MAX5033BASA+ | 4.5V–76V input, 250mA output, 100µA IQ; requires external MOSFETs and compensation. | Higher power, less integrated; suited for designs needing >20mA or custom topology control. | Select when scalability beyond 20mA or external switch control is mandatory. |
Compared with LTC3632IDD#PBF, LTC3631IDD#PBF offers higher output current but sacrifices programmable efficiency tuning, while MAX5033BASA+ provides wider input range and higher current at the cost of increased external component count and quiescent current - making LTC3632IDD#PBF optimal for compact, ultra-low-power 20mA applications.
Availability
LTC3632IDD#PBF is available at Aetrix Electronics and suitable for industrial control supplies, portable instruments, and battery-operated devices requiring stable component supply with guaranteed long-term availability and full temperature-grade compliance.
Supply support for LTC3632IDD#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3632 belongs to ADI's high-voltage monolithic DC/DC converter product line, designed specifically for reliable, low-quiescent-current regulation in harsh industrial, automotive, and instrumentation environments where input transients and extended temperature operation are critical.
FAQ
What is the maximum input voltage the LTC3632IDD#PBF can withstand without damage?
The LTC3632IDD#PBF has an absolute maximum VIN rating of 60V and includes internal overvoltage lockout (OVLO) that disables switching above 56V (rising) to protect the device. It can safely sustain 60V transients indefinitely, making it suitable for automotive load-dump and industrial surge environments. This rating is confirmed in the Absolute Maximum Ratings table and verified across all production lots.
Does the LTC3632IDD#PBF require external compensation components?
No, the LTC3632IDD#PBF uses a hysteretic Burst Mode® control architecture that requires no external compensation components. Its internal feedback loop is inherently stable across the full 4.5V–50V input range and 0.8V–VIN output range, eliminating the need for loop compensation networks and simplifying layout. This is explicitly stated in the FEATURES section and validated in all typical application circuits.
How is the output voltage set on the LTC3632IDD#PBF?
The output voltage of the LTC3632IDD#PBF is set using an external resistive divider connected to the VFB pin, based on the formula VOUT = 0.8V × (1 + R1/R2). The internal 0.8V ±1% reference ensures accuracy, and the divider ratio determines the final regulated output - for example, R1 = 33kΩ and R2 = 8.2kΩ yields 4.0V. This method is detailed in the APPLICATIONS INFORMATION section and Figure 6 of the datasheet.
What is the purpose of the HYST pin on the LTC3632IDD#PBF?
The HYST pin on the LTC3632IDD#PBF is an open-drain logic output pulled low when the RUN pin voltage falls below 1.1V, signaling disabled state. It enables adjustable undervoltage lockout (UVLO) by connecting a resistor divider from VIN to HYST, adding external hysteresis beyond the internal 110mV. This function is documented in the PIN FUNCTIONS and APPLICATIONS INFORMATION sections for precise input monitoring.
Can the LTC3632IDD#PBF operate at 100% duty cycle?
Yes, the LTC3632IDD#PBF supports 100% duty cycle operation, allowing VOUT to track closely to VIN minus small conduction losses - essential for brownout recovery and wide-input tracking applications. This capability is explicitly listed under FEATURES as "Low Dropout Operation: 100% Duty Cycle" and confirmed in the Electrical Characteristics table under RON parameters.
LTC3632IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 50V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 50V
- Current - Output:
- 20mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3632IDD#PBF FAQ
1.How can I place an order for LTC3632IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3632IDD#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 LTC3632IDD#PBF reliable?
The price and inventory of LTC3632IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3632IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3632IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3632IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3632IDD#PBF?
LTC3632IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3632IDD#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 LTC3632IDD#PBF?
For technical support, including LTC3632IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3632IDD#PBF requirements.
6.How does Aetrix verify that LTC3632IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3632IDD#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 LTC3632IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3632IDD#PBF?
All LTC3632IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3632IDD#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 LTC3632IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3632IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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