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Analog Devices Inc. LTC3388EDD-1#TRPBF
- Part No.:
- LTC3388EDD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3388EDD-1#TRPBF.pdf
- Description:
- IC REG BUCK PROG 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,017
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Product details
Overview
LTC3388EDD-1#TRPBF from Analog Devices (formerly Linear Technology) is a 20V-input, 50mA synchronous step-down DC/DC converter with nanopower quiescent current, internal high-side and low-side MOSFETs, and pin-selectable 1.2V/1.5V/1.8V/2.5V outputs. It delivers regulated power to ultra-low-power systems such as battery-backed sensors and industrial keep-alive rails while maintaining 720nA input IQ at 4V VIN in regulation.
For engineers reviewing the LTC3388EDD-1#TRPBF datasheet, LTC3388EDD-1#TRPBF pinout, LTC3388EDD-1#TRPBF application, or LTC3388EDD-1#TRPBF equivalent, key selection criteria include ultralow no-load IQ, hysteretic buck architecture, UVLO threshold of 2.3V, standby mode for ripple-sensitive loads, and DFN-10 (3mm × 3mm) package compatibility with space-constrained PCB layouts.
Technical Context
The LTC3388EDD-1#TRPBF implements a hysteretic synchronous buck topology with internal 100mΩ PMOS and 130mΩ NMOS switches, enabling discontinuous conduction mode operation that minimizes switching losses at light loads. Its sleep-state monitoring uses a dedicated comparator to detect VOUT droop below ±8mV hysteresis, triggering burst-mode switching only when required.
Internal rail generation produces CAP (VIN–4.8V) and VIN2 (4.6V regulated) for gate drive - neither intended for external use. Output voltage selection is static via D0/D1 logic pins tied to GND or VIN2, with no dynamic reconfiguration during regulation affecting PGOOD behavior.
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 Input IQ (VIN = 4V) | 720nA typical - enables multi-year battery life in always-on sensor nodes drawing µA-level average current. |
| Output Current | 50mA max - sufficient for powering microcontrollers, RF transceivers, or analog front-ends in compact IoT edge devices. |
| UVLO Threshold | 2.3V (falling) - prevents brownout operation and preserves battery capacity by disabling conversion before cell depletion. |
| Output Voltage Options | 1.2V, 1.5V, 1.8V, 2.5V - pin-selectable via D0/D1; eliminates need for external feedback resistors or firmware configuration. |
| Package | 10-Lead 3mm × 3mm DFN - exposes thermal pad (Pin 11) for direct PCB ground connection, enabling θJA = 43°C/W performance. |
| Standby Mode IQ | 720nA sleeping - maintains PGOOD assertion and output regulation while eliminating switching noise for sensitive analog circuits. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed thermal pad (Pin 11 = GND), rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input referenced to VIN2 | Logic-high enables buck operation; driven to VIN2 avoids added 40nA IQ; low disables converter and pulls PGOOD low. |
| STBY (Pin 2) | Standby mode control input referenced to VIN2 | High disables buck switching while preserving PGOOD and sleep comparator - ideal for low-ripple hold-up during brief wake cycles. |
| CAP (Pin 3) | PMOS gate drive rail (VIN – 4.8V) | Requires 1µF bypass to VIN; not for external use - internal charge pump ensures high-side switch turn-on across full VIN range. |
| VIN (Pin 4) | Main input supply connection | Accepts 2.7V–20V; requires ≥2.2µF ceramic capacitor placed adjacent to minimize EMI and input ripple. |
| SW (Pin 5) | Switch node between internal PMOS/NMOS | Connects to inductor (≥22µH); carries pulsed current up to 210mA peak - layout critical for efficiency and EMI control. |
| VOUT (Pin 6) | Output voltage sense and feedback point | Direct connection to output capacitor; internal feedback draws only 60nA at 2.5V - negligible load on regulated rail. |
| VIN2 (Pin 7) | NMOS gate drive and logic reference rail (4.6V) | Requires 4.7µF bypass to GND; supplies logic high for D0/D1/EN/STBY - not for external system use. |
| D1 (Pin 8) | MSB of output voltage select | Tied high/low to VIN2/GND per Table 1; sets 1.2V/1.5V/1.8V/2.5V - stable during regulation, no glitch on change. |
| D0 (Pin 9) | LSB of output voltage select | Paired with D1; full 2-bit encoding defines exact output voltage without trimming or calibration. |
| PGOOD (Pin 10) | Open-drain power-good indicator | Hi-Z when VOUT ≥92% of target; remains asserted during UVLO transition - enables safe system wake-up using stored output energy. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic synchronous buck control | Eliminates external compensation and enables zero-load regulation with <1µA total IQ - no external clock or loop stability concerns. |
| Pin-selectable output voltages | Four fixed outputs (1.2V/1.5V/1.8V/2.5V) set by D0/D1 logic levels - removes feedback resistor network, saving board area and BOM cost. |
| Standby mode with active PGOOD | Disables switching while retaining output regulation monitoring - reduces output ripple to near-DC levels for precision analog subsystems. |
| Integrated 100mΩ PMOS / 130mΩ NMOS | Enables >90% peak efficiency at 10mA–50mA loads with 22µH inductor - no external MOSFETs or driver ICs required. |
| UVLO with 2.3V falling threshold | Prevents deep discharge of primary Li-ion or coin cells - extends usable battery capacity by ~15% compared to 2.0V UVLO parts. |
Applications
| Industrial Sensor Node Power | Battery-Operated Medical Monitor |
|---|---|
Use Scenario: Continuous temperature/humidity sensing in remote factory environments powered by AA batteries. IC Role / Device Role / Timing Role: Primary 1.8V supply for ultra-low-power MCU and digital sensor interface. Use Value: 720nA no-load IQ extends 2-AA battery life beyond 10 years at 10µA average system load - eliminates field battery replacement. | Use Scenario: Wearable ECG patch requiring silent, ripple-free power during signal acquisition. IC Role / Device Role / Timing Role: Regulated 1.5V rail for analog front-end and ADC, activated only during measurement bursts. Use Value: Standby mode suppresses switching noise below 10µVpp - preserves 16-bit ADC SNR without additional LDO filtering. |
| Keep-Alive Supply for PLC I/O Module | Distributed Control System Auxiliary Rail |
Use Scenario: Maintaining real-time clock and nonvolatile memory state during main 24V supply interruption. IC Role / Device Role / Timing Role: Backup 2.5V regulator fed from supercapacitor charged during normal operation. Use Value: 2.3V UVLO allows >95% supercap discharge before shutdown - maximizes hold-up time from 3.3V to 2.5V rail. | Use Scenario: Local 1.2V supply for FPGA configuration memory and JTAG controller in modular automation hardware. IC Role / Device Role / Timing Role: Point-of-load regulator converting 5V backplane to FPGA core voltage. Use Value: Pin-selectable 1.2V eliminates feedback resistor tolerance error - ensures ±1% output accuracy across temperature without calibration. |
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 (100nA), but only 1.8V–5.5V VIN range and fixed 1.8V output; no pin-selectable voltages. | Suitable for single-voltage designs where minimum IQ dominates over input range or flexibility. | Select when battery life is paramount and output voltage is fixed at 1.8V; avoid if 2.5V or 20V input capability is required. |
| MAX17651ATC+ | Higher IQ (1.2µA), wider 4.5V–60V input, but requires external feedback resistors and has larger 16-pin TQFN package. | Better for high-input industrial systems where 20V upper limit is insufficient. | Choose for 24V/48V bus-powered equipment needing robust overvoltage protection - not for space- or IQ-constrained designs. |
Compared with TPS62840DRVR and MAX17651ATC+, the LTC3388EDD-1#TRPBF uniquely balances 20V input capability, 4-pin-selectable outputs, and sub-µA IQ in a 3mm × 3mm DFN - making it optimal for compact, multi-rail, battery-backed industrial edge nodes.
Availability
LTC3388EDD-1#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, battery-operated medical monitors, and distributed control system auxiliary rails requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3388EDD-1#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 continues its legacy of high-performance power management ICs for precision, industrial, and aerospace applications.
The LTC3388 product line was designed specifically for nanopower, wide-input, space-constrained applications where multi-year battery life and reliable regulation under variable load conditions are mandatory - targeting IoT edge sensors, portable instrumentation, and backup power systems.
FAQ
What is the maximum input voltage rating for the LTC3388EDD-1#TRPBF?
The LTC3388EDD-1#TRPBF has an absolute maximum input voltage rating of 22V, with continuous operation specified from 2.7V to 20V. Exceeding 22V may cause permanent damage. The device maintains sub-1µA no-load IQ across the full 2.7V–20V operating range, making it suitable for unregulated 12V or 19V adapter inputs with minimal derating.
How does the standby mode affect PGOOD behavior in the LTC3388EDD-1#TRPBF?
In standby mode (STBY = high), the LTC3388EDD-1#TRPBF disables buck switching but keeps the sleep comparator and PGOOD circuitry active. PGOOD remains Hi-Z as long as VOUT stays above 92% of the selected output voltage - ensuring system controllers receive uninterrupted power-good signaling even during silent operation.
Can the output voltage of the LTC3388EDD-1#TRPBF be changed dynamically during operation?
Yes - the LTC3388EDD-1#TRPBF allows dynamic D0/D1 reconfiguration while regulating. If transitioning to a higher output voltage, PGOOD asserts low until the new regulation point is reached; if transitioning lower, PGOOD remains high throughout. This enables firmware-controlled rail scaling without power cycle interruption.
What is the purpose of the CAP and VIN2 pins on the LTC3388EDD-1#TRPBF?
CAP (Pin 3) provides a gate-drive rail at VIN–4.8V for the internal PMOS switch; VIN2 (Pin 7) provides a regulated 4.6V rail for the NMOS switch and logic inputs. Both require dedicated bypass capacitors (1µF and 4.7µF respectively) and are strictly for internal use - connecting external loads will disrupt regulation and increase IQ.
Does the LTC3388EDD-1#TRPBF require an external compensation network?
No - the LTC3388EDD-1#TRPBF uses a hysteretic control architecture with internal feedback, eliminating the need for external compensation components. This simplifies design, improves reliability, and ensures stable regulation across all 1.2V–2.5V output options and load conditions from 10µA to 50mA without tuning.
LTC3388EDD-1#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):
- 1.2V, 1.5V, 1.8V, 2.5V
- 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-1#TRPBF FAQ
1.How can I place an order for LTC3388EDD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3388EDD-1#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-1#TRPBF reliable?
The price and inventory of LTC3388EDD-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3388EDD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3388EDD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3388EDD-1#TRPBF?
LTC3388EDD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3388EDD-1#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-1#TRPBF?
For technical support, including LTC3388EDD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3388EDD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3388EDD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3388EDD-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3388EDD-1#TRPBF?
All LTC3388EDD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3388EDD-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3388EDD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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