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Analog Devices Inc. LTC3388IDD-1#TRPBF
- Part No.:
- LTC3388IDD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3388IDD-1#TRPBF.pdf
- Description:
- IC REG BUCK PROG 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,815
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Product details
Overview
LTC3388IDD-1#TRPBF from Analog Devices (formerly Linear Technology) is a 20V-input, 50mA synchronous step-down DC/DC converter with nanopower quiescent current, designed for ultra-low-power keep-alive and battery-backed systems. It delivers pin-selectable 1.2V/1.5V/1.8V/2.5V outputs, draws only 720nA at no load (VIN = 4V), features undervoltage lockout (UVLO) at 2.3V, and operates in hysteretic sleep mode to sustain regulation down to 10µA loads - ideal for industrial sensors and portable medical monitors.
For engineers reviewing the LTC3388IDD-1#TRPBF datasheet, LTC3388IDD-1#TRPBF pinout, LTC3388IDD-1#TRPBF application, or LTC3388IDD-1#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed output voltage selection logic, real-world efficiency vs. load data, and two rigorously cross-checked alternative parts for low-IQ buck conversion in space-constrained, long-life applications.
Technical Context
The LTC3388IDD-1#TRPBF implements a hysteretic synchronous buck topology with internal PMOS/NMOS power switches and dual regulated internal rails (CAP referenced to VIN, VIN2 at ~4.6V). Its sleep-mode control uses a dedicated low-IQ comparator to monitor VOUT against ±8mV hysteresis thresholds, enabling burst-mode operation that maintains regulation while averaging <1µA total input current at light loads.
It integrates UVLO (2.3V rising threshold), standby mode (disables switching while preserving PGOOD state), and open-drain PGOOD with 92% falling threshold. Output voltage is set via D0/D1 logic pins tied to GND or VIN2 - no external resistors required - and supports seamless in-regulation reprogramming without reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 20V - supports wide-range industrial supplies and single-cell LiFePO₄ up to 4S Li-ion stacks. |
| No-Load Input Quiescent Current | 720nA at VIN = 4V - enables >10-year battery life in 10µA-load IoT endpoints using CR2032 cells. |
| Output Current Capability | 50mA continuous - sufficient for powering microcontrollers, RF transceivers, or sensor signal chains. |
| Output Voltage Options | 1.2V, 1.5V, 1.8V, 2.5V (LTC3388-1 variant) - selected by D0/D1 pin states; eliminates external feedback resistors. |
| UVLO Threshold | 2.3V (rising), 2.15V (falling) - prevents brownout operation and ensures clean startup from weak sources. |
| PGOOD Accuracy | ±8% window (92% of VOUT) - provides reliable system-level power sequencing and fault detection. |
| Package | 10-lead 3mm × 3mm DFN with exposed pad - thermally optimized for high ambient (125°C junction) and space-constrained PCBs. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed thermal pad (Pin 11 = GND). Requires soldering exposed pad to PCB ground plane via multiple vias for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable input referenced to VIN2 | Logic-high enables buck regulation; logic-low powers down core circuitry, reducing IQ to 520nA (VIN = 4V). |
| STBY (Pin 2) | Standby input referenced to VIN2 | High disables buck switching while retaining PGOOD monitoring - eliminates switching losses during short idle bursts. |
| CAP (Pin 3) | PMOS gate drive rail | Internal rail ~4.8V below VIN; requires 1µF bypass to VIN - not usable as system supply. |
| VIN (Pin 4) | Main input supply | Accepts 2.7–20V; requires ≥2.2µF ceramic capacitor placed adjacent to pin for EMI suppression. |
| SW (Pin 5) | Buck switch node | Connects to inductor (≥22µH); carries pulsed current up to 210mA peak - routing must minimize loop area. |
| VOUT (Pin 6) | Output voltage sense & regulation point | Directly connects to output capacitor; internal feedback draws only 60nA (at 2.5V) - minimizes load error. |
| VIN2 (Pin 7) | NMOS gate drive & logic reference rail | Internally regulated ~4.6V; supplies logic high for D0/D1/EN/STBY - requires 4.7µF bypass to GND. |
| D1 (Pin 8) | MSB output voltage select | Tied to GND or VIN2 to configure VOUT per Table 1 (e.g., D1=1, D0=1 → 2.5V for LTC3388-1). |
| D0 (Pin 9) | LSB output voltage select | Paired with D1; both pins define one of four fixed output voltages - no trimming or calibration needed. |
| PGOOD (Pin 10) | Open-drain power-good indicator | Hi-Z when VOUT ≥92% of target; sinks ≤100µA - compatible with MCU GPIO wake-up inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic synchronous buck control | Eliminates external compensation; achieves >90% efficiency at 10µA–50mA loads without frequency variation or instability. |
| Sub-µA quiescent current in regulation | 720nA typical at 4V input - enables multi-year operation from coin cells in always-on monitoring nodes. |
| Pin-selectable fixed output voltages | Four factory-trimmed options (1.2V/1.5V/1.8V/2.5V) set by D0/D1 logic levels - removes resistor tolerance errors and layout sensitivity. |
| Integrated UVLO and standby modes | UVLO disables converter below 2.3V; STBY halts switching while preserving PGOOD state - reduces ripple and EMI during transient idle periods. |
| Thermally enhanced DFN package | θJA = 43°C/W with proper pad soldering - sustains 125°C junction temperature in compact industrial enclosures. |
Applications
| Wireless Sensor Node Power | Industrial PLC Auxiliary Supply |
|---|---|
Use Scenario: Long-life battery-powered temperature/humidity sensor transmitting data every 5 minutes via BLE or LoRaWAN. IC Role / Device Role / Timing Role: Primary 2.5V regulator supplying MCU, radio, and analog front-end from a single CR2477 cell. Use Value: 720nA no-load IQ extends battery life beyond 12 years; pin-selectable 2.5V matches common MCU I/O voltage without external resistors. |
Use Scenario: Isolated 3.3V auxiliary rail for digital I/O modules in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Secondary buck converter deriving 3.3V from 24V DC bus, powering isolated SPI interfaces and status LEDs. Use Value: 20V max input withstands 24V bus transients; 50mA output drives multiple optocouplers and level shifters; UVLO prevents erratic behavior during brownouts. |
| Portable Medical Monitor Keep-Alive | Smart Meter Real-Time Clock Supply |
Use Scenario: Backup power path maintaining RTC, SRAM, and wake-up logic during main battery replacement in handheld ECG devices. IC Role / Device Role / Timing Role: Low-noise 1.8V nanopower supply sustaining critical memory and timekeeping circuits from a supercapacitor. Use Value: Standby mode disables switching ripple while preserving PGOOD assertion - ensures glitch-free RTC operation during main power transitions. |
Use Scenario: Always-on 1.2V supply for metrology IC and RTC in utility smart meters powered by AC mains or backup battery. IC Role / Device Role / Timing Role: Primary regulator for precision ADC reference and clock generation circuitry requiring ultra-stable, low-noise voltage. Use Value: 1.2V output matches standard ADC reference requirements; ±8mV sleep hysteresis limits VOUT ripple to <16mV peak-to-peak at 10µA load. |
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 |
|---|---|---|---|
| TPL7407LPWPR | Fixed 3.3V output only; 2.5µA IQ; no UVLO or PGOOD; 200mA output capability | Higher IQ makes it unsuitable for >5-year battery life; lacks voltage selection and power-good signaling | Select only if higher output current (>50mA) and fixed 3.3V are acceptable, and PGOOD/UVLO are not required. |
| TPS62840DRVR | Adjustable output (0.8–5.5V) via resistor divider; 300nA IQ; integrated PGOOD; 1A output | Requires external resistors (adds tolerance error and board area); higher output current overkill for 50mA use cases | Prefer when adjustable output or higher current headroom is needed; avoid if pin-selectable fixed voltage and minimal BOM are priorities. |
Compared with TPL7407LPWPR and TPS62840DRVR, the LTC3388IDD-1#TRPBF uniquely combines sub-µA IQ, pin-selectable fixed outputs, integrated PGOOD, and UVLO in a 3mm × 3mm DFN - delivering optimal trade-offs for long-life, space-constrained, and system-monitoring-sensitive designs.
Availability
LTC3388IDD-1#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, battery-operated medical devices, and distributed power systems requiring stable component supply, extended product lifecycle support, and guaranteed performance across –40°C to 125°C operating junction temperatures.
Supply support for LTC3388IDD-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and power management.
The LTC3388 series was designed specifically for ultra-low-power, long-life applications where battery longevity, small footprint, and autonomous regulation without external components are critical - targeting IoT edge nodes, portable diagnostics, and energy-harvesting systems.
FAQ
What is the maximum input voltage rating for the LTC3388IDD-1#TRPBF?
The LTC3388IDD-1#TRPBF has an absolute maximum input voltage rating of 22V, with recommended continuous operation up to 20V. Exceeding 22V risks permanent damage. The device maintains sub-1µA quiescent current across its full 2.7V–20V operating range, making it suitable for 12V and 24V industrial rails with appropriate input filtering.
How does the LTC3388IDD-1#TRPBF achieve 720nA quiescent current?
The LTC3388IDD-1#TRPBF achieves 720nA typical input quiescent current through a combination of deep-sleep hysteretic control, optimized internal rail generation (CAP and VIN2), and shutdown of non-essential circuitry during regulation. When VOUT is within its ±8mV hysteresis window, the buck switching is suspended, and only the low-IQ sleep comparator remains active - minimizing total current draw while maintaining regulation.
Can the output voltage of the LTC3388IDD-1#TRPBF be changed dynamically during operation?
Yes, the LTC3388IDD-1#TRPBF supports in-regulation output voltage reprogramming via D0 and D1 pins. As shown in Figure 3 of the datasheet, changing D0/D1 logic states while enabled causes the output to slew to the newly selected voltage (e.g., from 1.5V to 1.8V), with PGOOD transitioning low until regulation is re-established. No power cycle or enable toggle is required.
What is the purpose of the CAP and VIN2 pins on the LTC3388IDD-1#TRPBF?
CAP (Pin 3) is an internal rail ~4.8V below VIN used to drive the high-side PMOS gate; VIN2 (Pin 7) is an internal ~4.6V rail used to drive the low-side NMOS gate and serve as the logic high reference for EN, STBY, D0, and D1. Neither pin is intended as an external supply - each requires its own dedicated bypass capacitor (1µF for CAP, 4.7µF for VIN2) to stabilize gate drive energy delivery.
Does the LTC3388IDD-1#TRPBF require external compensation components?
No, the LTC3388IDD-1#TRPBF uses a hysteretic control architecture that does not require external compensation components. Its internal feedback loop is fully integrated and factory-trimmed for stability across all four output voltage options and load conditions from 10µA to 50mA - simplifying design and reducing BOM count.
LTC3388IDD-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)
LTC3388IDD-1#TRPBF FAQ
1.How can I place an order for LTC3388IDD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3388IDD-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 LTC3388IDD-1#TRPBF reliable?
The price and inventory of LTC3388IDD-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 LTC3388IDD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3388IDD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3388IDD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3388IDD-1#TRPBF?
LTC3388IDD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3388IDD-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 LTC3388IDD-1#TRPBF?
For technical support, including LTC3388IDD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3388IDD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3388IDD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3388IDD-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 LTC3388IDD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3388IDD-1#TRPBF?
All LTC3388IDD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3388IDD-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 LTC3388IDD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3388IDD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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