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Analog Devices Inc. LTC3388IDD-3#PBF
- Part No.:
- LTC3388IDD-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3388IDD-3#PBF.pdf
- Description:
- IC REG BUCK PROG 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:398
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Product details
Overview
LTC3388IDD-3#PBF from Analog Devices (formerly Linear Technology) is a 20V-input, 50mA 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 power switches. It delivers ultra-low-power regulation for battery-backed sensors and industrial keep-alive rails.
For engineers reviewing the LTC3388IDD-3#PBF datasheet, LTC3388IDD-3#PBF pinout, LTC3388IDD-3#PBF application, or LTC3388IDD-3#PBF equivalent, key selection criteria include its 2.7V–20V input range, standby mode disabling buck switching, UVLO threshold of 2.3V (typ), 10-lead 3mm × 3mm DFN package, and guaranteed operation from –40°C to 125°C.
Technical Context
The LTC3388IDD-3#PBF 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 above GND). It operates in sleep mode during light loads, waking only when VOUT falls below the sleep threshold (±16mV around selected output).
Its control logic uses dual comparators - a low-IQ sleep comparator and a higher-IQ PGOOD comparator - enabling Hi-Z PGOOD signaling at 92% of target VOUT while maintaining <820nA IQ at 20V input. Standby mode disables switching but retains PGOOD and sleep monitoring, reducing VIN current to 720nA (sleeping) or 2000nA (not sleeping) at 4V.
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 Quiescent Current | 720nA at VIN = 4V - enables multi-year operation on coin cells or energy-harvesting sources. |
| Output Voltage Options | 2.8V, 3.0V, 3.3V, or 5.0V - selected via D1/D0 pins tied to GND or VIN2; no external feedback resistors required. |
| Max Output Current | 50mA - sufficient for low-power microcontrollers, RTCs, and sensor interfaces in always-on subsystems. |
| UVLO Threshold | 2.3V (typ, falling) - prevents erratic operation during brownout while maintaining sub-µA shutdown IQ of 400nA. |
| Package | 10-lead 3mm × 3mm DFN with exposed pad - thermally optimized (θJC = 7.5°C/W) for compact PCB layouts. |
| Operating Temperature | –40°C to 125°C junction - qualified for automotive under-hood, industrial control, and harsh-environment deployment. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND), rated for –40°C to 125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable input referenced to VIN2 | Logic-high enables buck regulation; driven to VIN2 adds zero extra IQ; drives PGOOD low when low. |
| STBY (Pin 2) | Standby input referenced to VIN2 | Logic-high disables buck switching while preserving PGOOD and sleep monitoring; reduces dynamic IQ. |
| CAP (Pin 3) | PMOS gate drive rail | Internally regulated at VIN – 4.8V; requires 1µF bypass to VIN; not usable as system supply rail. |
| VIN (Pin 4) | Main input voltage supply | Accepts 2.7V–20V; requires ≥2.2µF ceramic bypass close to pin to minimize EMI and ringing. |
| SW (Pin 5) | Buck switch node | Connects to inductor (≥22µH); carries pulsed current up to 210mA peak; layout critical for efficiency. |
| VOUT (Pin 6) | Output voltage sense and regulation point | Directly monitors regulated output; internal feedback draws only 66–120nA depending on VOUT setting. |
| VIN2 (Pin 7) | NMOS gate drive and logic reference rail | Internally regulated at 4.6V above GND; powers D0/D1/EN/STBY logic; requires 4.7µF bypass to GND. |
| D1 (Pin 8) | MSB of output voltage select | Tied high (VIN2) or low (GND) to set VOUT: D1D0 = 00→2.8V, 01→3.0V, 10→3.3V, 11→5.0V. |
| D0 (Pin 9) | LSB of output voltage select | Used with D1 to configure one of four factory-trimmed output voltages; no external components needed. |
| PGOOD (Pin 10) | Open-drain power-good indicator | Hi-Z when VOUT ≥92% of target; sinks current when below threshold; compatible with µC I/O pins. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic synchronous buck control | Eliminates external compensation; achieves >90% efficiency at 10µA load via adaptive burst-mode switching. |
| Pin-selectable output voltages | Four factory-trimmed options (2.8V/3.0V/3.3V/5.0V) set by D1/D0 logic levels - no resistor network or trimming required. |
| Standby mode with active monitoring | Disables switching while retaining PGOOD and sleep comparator functionality - ideal for intermittent wake-up systems. |
| Integrated dual-rail generation | CAP and VIN2 rails generated internally eliminate need for external LDOs or charge pumps for gate drive. |
| Ultra-low UVLO quiescent current | 400nA IQ in UVLO state extends battery life during deep sleep or storage conditions. |
Applications
| Wireless Sensor Node Power | Industrial PLC Keep-Alive Rail |
|---|---|
Use Scenario: Long-life battery-powered temperature/humidity sensor transmitting data every 5 minutes via BLE or LoRa. IC Role / Device Role / Timing Role: Primary 3.3V regulator supplying MCU, RF transceiver, and analog front-end during active and sleep cycles. Use Value: 720nA no-load IQ enables >10-year operation on a single CR2032; standby mode cuts switching noise during RF receive windows. |
Use Scenario: Backup power for real-time clock and configuration memory in programmable logic controllers during AC mains failure. IC Role / Device Role / Timing Role: Always-on 3.0V regulator powered from supercapacitor or backup battery, maintaining SRAM and RTC registers. Use Value: 2.7V–20V input range accepts degraded capacitor voltage down to 2.8V; UVLO prevents brownout-induced corruption. |
| Energy-Harvesting IoT Edge Device | Automotive Body Control Module Subsystem |
Use Scenario: Solar- or vibration-harvested power management for predictive maintenance sensor on rotating machinery. IC Role / Device Role / Timing Role: Step-down regulator converting variable harvester output (5–18V) to stable 5.0V for microcontroller and ADC. Use Value: High efficiency (>85%) across 10µA–50mA load range maximizes usable energy; 20V abs max rating tolerates solar open-circuit spikes. |
Use Scenario: Low-power domain supply for door module microcontroller and LIN transceiver in 12V automotive systems. IC Role / Device Role / Timing Role: Secondary 2.8V rail powering CAN/LIN interface logic and wake-up circuitry during vehicle sleep mode. Use Value: –40°C to 125°C rating ensures reliability under hood; 720nA IQ meets OEM <1µA sleep budget requirements. |
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 (60nA typical), fixed 1.8V/2.3V/3.3V outputs, no pin-selectable VOUT; requires external feedback for custom voltages. | Best for ultra-low-IQ designs where output voltage is fixed and board space is constrained (1.5mm × 1.5mm QFN). | Select LTC3388IDD-3#PBF when pin-selectable 2.8V/3.0V/3.3V/5.0V outputs and 20V input capability are required without external resistors. |
| MAX17651ATB+T | Higher IQ (1.2µA), wider 4.5V–60V input, 100mA output, adjustable VOUT via resistor divider; no standby mode. | Suitable for higher-power industrial supplies where input voltage exceeds 20V and load exceeds 50mA. | Choose LTC3388IDD-3#PBF for sub-µA IQ, standby functionality, and compact DFN packaging in ≤50mA applications. |
Compared with TPS62840DRVR and MAX17651ATB+T, the LTC3388IDD-3#PBF uniquely combines pin-selectable outputs, 20V input tolerance, and true standby mode - making it optimal for space-constrained, battery-backed systems requiring flexible voltage options and minimal sleep current.
Availability
LTC3388IDD-3#PBF is available at Aetrix Electronics and suitable for wireless sensor nodes, industrial PLC keep-alive rails, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC3388IDD-3#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 acquired Linear Technology in 2017 and maintains its legacy of precision power management ICs with rigorous automotive and industrial qualification standards.
The LTC3388 family was designed specifically for ultra-low-power, wide-input DC/DC conversion in battery-operated and energy-harvesting systems - emphasizing nanopower IQ, integrated MOSFETs, and robust thermal performance in miniature packages.
FAQ
What output voltage does LTC3388IDD-3#PBF deliver by default?
The LTC3388IDD-3#PBF has no default output voltage - it is determined solely by the logic states of D1 and D0 pins. With both D1 and D0 tied to GND (00), LTC3388IDD-3#PBF delivers 2.8V; D1=0/D0=1 yields 3.0V; D1=1/D0=0 yields 3.3V; and D1=D0=1 sets 5.0V. No external resistors are needed, and the output is factory-trimmed for ±1.5% accuracy over temperature.
Can LTC3388IDD-3#PBF operate with an input voltage below 2.7V?
No - the absolute minimum operating input voltage for LTC3388IDD-3#PBF is 2.7V per datasheet specifications. If VIN drops below 2.7V, the part enters undervoltage lockout (UVLO) at ~2.3V (falling threshold), disabling regulation and reducing IQ to 400nA. Operation below 2.7V is not characterized or guaranteed, and attempting it may cause unstable output or undefined behavior.
How does standby mode affect PGOOD functionality in LTC3388IDD-3#PBF?
In standby mode (STBY = high), LTC3388IDD-3#PBF disables buck switching but keeps the PGOOD comparator and sleep comparator active. PGOOD remains Hi-Z as long as VOUT stays ≥92% of the selected output voltage. If VOUT falls below that threshold while in standby, PGOOD pulls low - enabling reliable power-fail detection even with switching disabled.
Is LTC3388IDD-3#PBF pin-compatible with LTC3388IDD-1#PBF?
Yes - LTC3388IDD-3#PBF and LTC3388IDD-1#PBF share identical pinout, package (10-lead 3mm × 3mm DFN), and electrical interface. The only functional difference is the output voltage table: LTC3388IDD-1#PBF supports 1.2V/1.5V/1.8V/2.5V, while LTC3388IDD-3#PBF supports 2.8V/3.0V/3.3V/5.0V. PCBs designed for one can accommodate the other with only D1/D0 wiring changes.
What is the maximum inductor value recommended for LTC3388IDD-3#PBF?
The datasheet specifies minimum inductor values (≥22µH for standard designs), but does not define a hard maximum. However, using excessively large inductors (e.g., >470µH) increases startup time, reduces transient response, and may cause instability due to reduced switching frequency and comparator delay effects. For optimal performance across 10µA–50mA loads, 22µH–100µH is the validated range - with 100µH shown in efficiency curves for LTC3388IDD-3#PBF.
LTC3388IDD-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-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):
- 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)
LTC3388IDD-3#PBF FAQ
1.How can I place an order for LTC3388IDD-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3388IDD-3#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 LTC3388IDD-3#PBF reliable?
The price and inventory of LTC3388IDD-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3388IDD-3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3388IDD-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3388IDD-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3388IDD-3#PBF?
LTC3388IDD-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3388IDD-3#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 LTC3388IDD-3#PBF?
For technical support, including LTC3388IDD-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3388IDD-3#PBF requirements.
6.How does Aetrix verify that LTC3388IDD-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3388IDD-3#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 LTC3388IDD-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3388IDD-3#PBF?
All LTC3388IDD-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3388IDD-3#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 LTC3388IDD-3#PBF part is unused and in its original packaging.
Return procedure for LTC3388IDD-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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