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Analog Devices Inc. LTC3388EDD-3#TRPBF
- Part No.:
- LTC3388EDD-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3388EDD-3#TRPBF.pdf
- Description:
- IC REG BUCK PROG 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3388EDD-3#TRPBF from Analog Devices (formerly Linear Technology) is a 20V input, nanopower synchronous step-down DC/DC converter with pin-selectable 2.8V/3.0V/3.3V/5.0V outputs, 720nA no-load quiescent current at 4V input, and integrated high-side PMOS and low-side NMOS switches. It delivers up to 50mA output current and targets ultra-low-power keep-alive rails in battery-operated systems.
For engineers reviewing the LTC3388EDD-3#TRPBF datasheet, LTC3388EDD-3#TRPBF pinout, LTC3388EDD-3#TRPBF application, or LTC3388EDD-3#TRPBF equivalent, key selection criteria include UVLO threshold (2.3V), standby mode operation, hysteretic control architecture, PGOOD open-drain signaling, and DFN-10 package thermal performance (θJA = 43°C/W).
Technical Context
The LTC3388EDD-3#TRPBF implements a hysteretic synchronous buck topology with internal rail generation: CAP (gate drive for PMOS, regulated at VIN – 4.8V) and VIN2 (gate drive for NMOS, regulated at 4.6V). It operates in sleep mode during light loads, waking only when VOUT falls below the sleep threshold (±16mV around selected output voltage), minimizing average IQ.
Control logic uses dual digital inputs (D0/D1) referenced to VIN2 to select one of four fixed output voltages; EN enables/disables regulation; STBY disables switching while preserving PGOOD and sleep comparator functionality. The PGOOD pin asserts Hi-Z when VOUT exceeds 92% of the target voltage and remains asserted through UVLO entry until VOUT drops to that threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 20V - supports wide-input industrial and battery-supplied systems without external pre-regulation. |
| No-Load IQ (VIN = 4V) | 720nA typical - enables multi-year operation on coin cells or energy-harvesting sources. |
| Output Current | 50mA max - sufficient for MCU backup rails, real-time clocks, and sensor biasing. |
| UVLO Threshold | 2.3V (falling) - prevents erratic operation during brownout while maintaining sub-µA shutdown IQ. |
| Output Voltage Options | 2.8V / 3.0V / 3.3V / 5.0V - pin-selectable via D0/D1, eliminating external feedback resistors. |
| PGOOD Accuracy | ±8% of VOUT - provides reliable power-good signaling for microcontroller reset sequencing. |
| Package Thermal Resistance | θJA = 43°C/W - enables 125°C junction operation in compact PCB layouts with exposed pad soldered. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN (DD), Exposed Pad (Pin 11) = GND, requires soldering to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable Input | Logic-high referenced to VIN2 enables regulation; driving to VIN2 adds zero extra IQ. |
| STBY (Pin 2) | Standby Control | Logic-high disables buck switching while retaining PGOOD and sleep monitoring - ideal for burst-mode load handling. |
| CAP (Pin 3) | PMOS Gate Drive Rail | Internal rail at VIN – 4.8V; requires 1µF bypass to VIN - not usable as system supply. |
| VIN (Pin 4) | Main Input Supply | Accepts 2.7–20V; requires ≥2.2µF ceramic bypass close to pin to minimize EMI and input ripple. |
| SW (Pin 5) | Switch Node | Connects to inductor (≥22µH); carries pulsed current - layout critical for efficiency and EMI. |
| VOUT (Pin 6) | Output Sense & Regulation | Feedback node; internal resistor divider sets output - no external resistors needed. |
| VIN2 (Pin 7) | NMOS Gate Drive & Logic Rail | Internal 4.6V rail powering D0/D1/EN/STBY logic - requires 4.7µF bypass; not for external use. |
| D1 (Pin 8) | Output Voltage Select MSB | Tied high/low to VIN2/GND per Table 1 to select 2.8V/3.0V/3.3V/5.0V - stable during regulation. |
| D0 (Pin 9) | Output Voltage Select LSB | Paired with D1 for full 4-output selection - no glitching during dynamic reconfiguration. |
| PGOOD (Pin 10) | Open-Drain Power-Good Flag | Hi-Z when VOUT ≥ 92% of target; sinks ≤100µA - drives MCU I/O directly, not LEDs or heavy loads. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic Synchronous Buck Control | Eliminates external compensation and enables >90% efficiency at 10µA–50mA loads without frequency variation. |
| Pin-Selectable Output Voltages | Four factory-programmed options (2.8V/3.0V/3.3V/5.0V) reduce BOM count and eliminate feedback resistor tolerance errors. |
| Standby Mode with Active Monitoring | Disables switching losses while keeping PGOOD and sleep comparators active - preserves system awareness during idle periods. |
| Integrated Dual-Rail Generation | CAP and VIN2 rails self-generate from VIN, enabling full 20V operation without external LDOs or charge pumps. |
| UVLO with Hysteresis | 2.3V falling threshold and 2.5V rising threshold prevent oscillation near dropout - ensures clean startup/shutdown. |
Applications
| Real-Time Clock (RTC) Backup Power | Wireless Sensor Node Keep-Alive Rail |
|---|---|
Use Scenario: Maintaining timekeeping and SRAM retention in microcontrollers during main power loss or deep-sleep cycles. IC Role / Device Role / Timing Role: Ultra-low-IQ step-down regulator supplying stable 3.3V to RTC circuitry from primary battery or energy harvester. Use Value: 720nA no-load IQ extends coin-cell life beyond 10 years; PGOOD signals valid timekeeping voltage to host MCU. | Use Scenario: Providing always-on bias to RF transceivers, environmental sensors, and wake-up controllers in battery-powered IoT endpoints. IC Role / Device Role / Timing Role: Nanopower buck converter delivering 3.0V/5.0V to low-duty-cycle peripherals between transmissions. Use Value: Standby mode eliminates switching noise during sensor sampling; hysteretic control ensures fast wake-up response (<10µs) from sleep. |
| Industrial PLC Auxiliary Supply | Medical Wearable Low-Power Bias |
Use Scenario: Generating isolated 2.8V or 5.0V auxiliary rails for analog front-ends, isolation drivers, and watchdog circuits in programmable logic controllers. IC Role / Device Role / Timing Role: High-input-voltage (up to 20V) regulator tolerant of 24V industrial bus transients and brownouts. Use Value: 2.3V UVLO prevents malfunction during line sags; DFN-10 package supports conformal coating and high-density board layouts. | Use Scenario: Powering ECG/PPG signal conditioning, memory, and BLE radio in disposable or rechargeable medical patches. IC Role / Device Role / Timing Role: Primary 3.3V supply for mixed-signal SoC with strict leakage and EMI requirements. Use Value: 43°C/W θJA enables passive thermal management; PGOOD ensures safe MCU boot before sensor activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DRVR | Lower IQ (300nA), fixed 1.8V/2.5V/3.3V outputs, no pin-selectable voltage; requires external feedback for custom VOUT. | Optimized for single-VOUT wearables; lacks D0/D1 flexibility and 5.0V option. | Select when absolute minimum IQ is critical and output voltage is fixed across production. |
| MAX17651ATB+ | Higher IQ (1.2µA), wider 4.5–60V input, adjustable output (0.9–15V) via resistor divider; no standby mode. | Suited for higher-voltage industrial inputs but consumes >1.5× more quiescent current at light loads. | Select when input exceeds 20V or adjustable VOUT is required - not a drop-in replacement. |
Compared with TPS62840DRVR and MAX17651ATB+, the LTC3388EDD-3#TRPBF uniquely balances ultra-low IQ, pin-selectable multi-voltage outputs, standby mode, and 20V input capability - making it optimal for space-constrained, multi-rail, battery-backed systems where flexibility and longevity are co-prioritized.
Availability
LTC3388EDD-3#TRPBF is available at Aetrix Electronics and suitable for real-time clock backup, wireless sensor node keep-alive, and industrial PLC auxiliary supplies requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LTC3388EDD-3#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 acquired Linear Technology in 2017 and maintains its legacy of precision, power, and interface ICs for demanding industrial, automotive, and medical applications.
The LTC3388 series belongs to Linear's nanopower DC/DC converter product line, designed specifically for energy-constrained systems requiring multi-year operation from small batteries or ambient energy harvesters.
FAQ
What is the maximum input voltage rating for the LTC3388EDD-3#TRPBF?
The LTC3388EDD-3#TRPBF has an absolute maximum input voltage rating of 22V, with continuous operation specified from 2.7V to 20V. Operation above 20V risks permanent damage, and the device enters undervoltage lockout below 2.3V to protect downstream circuitry. This 20V operating range makes the LTC3388EDD-3#TRPBF suitable for 12V and 24V industrial bus interfaces with transient suppression.
How does the standby mode affect PGOOD behavior in the LTC3388EDD-3#TRPBF?
In standby mode (STBY = high), the LTC3388EDD-3#TRPBF disables buck switching but keeps the PGOOD comparator and sleep comparator active. PGOOD remains Hi-Z as long as VOUT stays above 92% of the selected output voltage - identical to normal regulation. This allows host systems to retain power-good status even during extended idle periods without consuming switching-related IQ.
Can the output voltage of the LTC3388EDD-3#TRPBF be changed dynamically during operation?
Yes, the LTC3388EDD-3#TRPBF supports dynamic output voltage reconfiguration via D0 and D1 pins while in regulation. When transitioning to a higher output voltage (e.g., 3.3V → 5.0V), PGOOD briefly goes low until VOUT reaches the new target; when stepping down (e.g., 5.0V → 3.3V), PGOOD remains asserted throughout. No power cycle or EN toggle is required - enabling adaptive power management in firmware-controlled systems.
What is the purpose of the CAP and VIN2 pins on the LTC3388EDD-3#TRPBF?
CAP (Pin 3) is an internal gate-drive rail regulated at VIN – 4.8V, used exclusively to drive the high-side PMOS switch. VIN2 (Pin 7) is an internal 4.6V rail used to drive the low-side NMOS switch and serve as the logic high reference for EN, STBY, D0, and D1. Neither pin is intended for external system use - both require dedicated bypass capacitors (1µF and 4.7µF respectively) and must not be loaded.
Does the LTC3388EDD-3#TRPBF require external compensation components?
No, the LTC3388EDD-3#TRPBF uses a hysteretic control architecture with internal compensation, eliminating the need for external RC networks or type-II/III compensators. This simplifies design, reduces component count, and ensures stable operation across all supported output voltages and load conditions without loop-tuning - a key advantage over voltage-mode or current-mode buck regulators.
LTC3388EDD-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 2.8V, 3V, 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3388EDD-3#TRPBF FAQ
1.How can I place an order for LTC3388EDD-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3388EDD-3#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 LTC3388EDD-3#TRPBF reliable?
The price and inventory of LTC3388EDD-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3388EDD-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3388EDD-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3388EDD-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3388EDD-3#TRPBF?
LTC3388EDD-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3388EDD-3#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 LTC3388EDD-3#TRPBF?
For technical support, including LTC3388EDD-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3388EDD-3#TRPBF requirements.
6.How does Aetrix verify that LTC3388EDD-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3388EDD-3#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 LTC3388EDD-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3388EDD-3#TRPBF?
All LTC3388EDD-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3388EDD-3#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 LTC3388EDD-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3388EDD-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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