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Analog Devices Inc. LTC3388EDD-1#PBF
- Part No.:
- LTC3388EDD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3388EDD-1#PBF.pdf
- Description:
- IC REG BUCK PROG 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:330
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Product details
Overview
LTC3388EDD-1#PBF from Analog Devices (formerly Linear Technology) is a 20V-input, nanopower synchronous step-down DC/DC converter with integrated high-side PMOS and low-side NMOS switches. It delivers up to 50mA output current, maintains regulation with only 720nA input quiescent current at 4V input, and supports pin-selectable fixed outputs of 1.2V, 1.5V, 1.8V, or 2.5V - ideal for ultra-low-power keep-alive rails in battery-backed systems.
For engineers reviewing the LTC3388EDD-1#PBF datasheet, LTC3388EDD-1#PBF pinout, LTC3388EDD-1#PBF application, or LTC3388EDD-1#PBF equivalent, key selection criteria include its sub-1µA no-load IQ, hysteretic control architecture, UVLO threshold of 2.3V, standby mode for ripple-sensitive loads, and compatibility with 3mm × 3mm DFN packaging for space-constrained IoT sensor nodes and industrial monitoring modules.
Technical Context
The LTC3388EDD-1#PBF employs a hysteretic synchronous buck topology that eliminates external compensation and enables zero-load regulation via sleep/wake cycles. Its internal rail generation produces CAP (VIN–4.8V) and VIN2 (4.6V regulated) to drive the power switches and logic inputs independently of input voltage down to 2.7V.
Operation relies on dual comparators: a high-accuracy sleep comparator (±8mV hysteresis around VOUT) governs ultralow-IQ sleep state, while a separate PGOOD comparator monitors output validity at 92% of target VOUT. Output voltage selection is static via D0/D1 pins tied to GND or VIN2, with no dynamic reconfiguration during regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 20V - supports wide-input industrial and automotive-supplied rails without external pre-regulation. |
| No-Load Input Quiescent Current | 720nA at VIN = 4V - enables multi-year battery life in always-on sensor nodes with 10µA average load. |
| Output Current Capability | 50mA continuous - sufficient for powering microcontrollers, RTCs, or low-power transceivers from a single compact regulator. |
| Output Voltage Options | 1.2V / 1.5V / 1.8V / 2.5V (pin-selectable) - matches common I/O and core voltage requirements without external feedback resistors. |
| UVLO Threshold | 2.3V (falling) - prevents brownout operation and preserves battery capacity by disabling conversion before cell depletion. |
| PGOOD Accuracy | ±8% window (92% to 100% of VOUT) - provides reliable power sequencing signal for host processors without additional supervision ICs. |
| Package | 10-lead 3mm × 3mm DFN with exposed thermal pad - enables high-density layout and efficient PCB heat dissipation in compact modules. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed GND pad (Pin 11), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered 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 disables converter and reduces IQ to 520nA, preserving battery energy. |
| STBY (Pin 2) | Standby mode input referenced to VIN2 | High disables switching while maintaining regulation and PGOOD status - eliminates switching ripple for sensitive analog circuits. |
| CAP (Pin 3) | PMOS gate drive rail (VIN – 4.8V) | Requires 1µF bypass capacitor; not for external use - ensures robust high-side switch turn-on independent of VIN droop. |
| VIN (Pin 4) | Main input supply connection | Accepts 2.7V–20V; requires ≥2.2µF ceramic bypass close to pin to minimize EMI and support peak switch currents. |
| SW (Pin 5) | Buck switch node | Connects to inductor (≥22µH); carries pulsed current up to 210mA peak - routing must minimize loop area for EMI control. |
| VOUT (Pin 6) | Output voltage sense and feedback | Direct connection to output capacitor; internal feedback network 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; supplies logic high for D0/D1/EN/STBY - eliminates need for external level-shifting in low-VIN applications. |
| D1 (Pin 8) | MSB of output voltage select | Tied to GND or VIN2 to configure VOUT per Table 1 - static setting; no runtime change required for fixed-voltage designs. |
| D0 (Pin 9) | LSB of output voltage select | Paired with D1 to select 1.2V/1.5V/1.8V/2.5V - eliminates external resistor dividers and associated leakage paths. |
| PGOOD (Pin 10) | Open-drain power-good indicator | Hi-Z when VOUT ≥ 92% of target; sinks current when below - interfaces directly with µC reset or enable inputs without pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic synchronous buck control | Eliminates external compensation components and enables stable regulation at nanoscale load currents (10µA) without instability risk. |
| Sub-1µA quiescent current in regulation | 720nA IQ at 4V input extends shelf life and operational lifetime of coin-cell-powered devices beyond 10 years. |
| Integrated dual-rail generation (CAP/VIN2) | Provides dedicated gate-drive voltages for PMOS/NMOS switches and logic inputs - ensures robust switching across full VIN range. |
| Pin-selectable fixed outputs | Four factory-trimmed VOUT options eliminate feedback resistor networks, reducing BOM count, board area, and leakage-induced error. |
| Standby mode with active PGOOD | Disables switching noise while retaining output regulation and power-good signaling - critical for mixed-signal systems requiring clean analog supplies. |
Applications
| Wireless Sensor Node Power | Industrial PLC Keep-Alive Supply |
|---|---|
Use Scenario: A battery-powered temperature/humidity sensor transmits data every 5 minutes using BLE, remaining in deep sleep between transmissions. IC Role / Device Role / Timing Role: LTC3388EDD-1#PBF provides 1.8V bias to MCU and sensor during active transmission and maintains RTC/regulator state during 5-minute sleep intervals. Use Value: 720nA no-load IQ enables >12-year coin-cell operation; pin-selectable 1.8V output matches standard MCU I/O voltage without trimming resistors. |
Use Scenario: Programmable logic controller retains configuration memory and real-time clock during AC mains failure using supercapacitor backup. IC Role / Device Role / Timing Role: LTC3388EDD-1#PBF regulates 2.5V from supercapacitor discharge curve (5.5V → 2.3V) to power SRAM and RTC during brownout. Use Value: 2.3V UVLO threshold aligns with supercapacitor usable voltage range; 50mA output sustains memory retention current during extended outages. |
| Portable Medical Monitor Bias Rail | Low-Power Industrial Data Logger |
Use Scenario: Handheld ECG device operates intermittently for patient spot-checks, spending >99% of time in shutdown with only RTC and wake-up circuitry active. IC Role / Device Role / Timing Role: LTC3388EDD-1#PBF supplies 1.2V to ultra-low-power RTC and interrupt controller, enabling precise wake timing with minimal self-discharge. Use Value: 400nA IQ in UVLO state minimizes supercapacitor or Li-primary cell drain during storage; DFN package fits within tight handheld enclosure constraints. |
Use Scenario: Remote environmental logger samples temperature/pressure hourly and stores data to flash memory, powered by AA alkaline cells. IC Role / Device Role / Timing Role: LTC3388EDD-1#PBF delivers 1.5V to microcontroller and ADC during 100ms active window, then enters sleep until next sample. Use Value: Standby mode eliminates switching ripple during ADC conversion; 1.5V output matches precision ADC reference requirements without LDO post-regulation. |
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 |
|---|---|---|---|
| TPL7407LADGQR | 7V max input, 250mA output, 2.5µA IQ - higher IQ, wider VIN range not supported, no UVLO or PGOOD. | Suitable for higher-current, non-battery-critical applications where 2.5µA IQ is acceptable. | Select if >25mA load current is needed and 2.5µA IQ does not impact battery life; avoid for coin-cell or >5-year deployments. |
| TPS62840DRVR | 6V max input, 1.4µA IQ (typ), 1.8V–3.3V adjustable output, I²C programmable - requires external resistors or digital interface. | Preferred where dynamic voltage scaling or tighter output tolerance (<±1%) is required. | Choose when system firmware can manage I²C configuration or when ±0.5% initial accuracy outweighs added complexity and cost. |
Compared with TPL7407LADGQR and TPS62840DRVR, the LTC3388EDD-1#PBF uniquely combines 720nA IQ, 20V input capability, pin-selectable fixed outputs, and integrated PGOOD in a 3mm × 3mm DFN - making it optimal for long-life, space-constrained, single-rail battery systems where simplicity and ultra-low IQ are mandatory.
Availability
LTC3388EDD-1#PBF is available at Aetrix Electronics and suitable for wireless sensor nodes, industrial PLC keep-alive supplies, and portable medical monitor bias rails requiring stable component supply across multi-year production cycles.
Supply support for LTC3388EDD-1#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 high-performance power management ICs with rigorous automotive and industrial qualification.
The LTC3388EDD-1#PBF belongs to Linear's nanopower DC/DC converter family, designed specifically for energy-harvesting and battery-operated systems where microwatt-level quiescent power and long-term reliability are primary design constraints.
FAQ
What is the minimum input voltage required for the LTC3388EDD-1#PBF to regulate a 1.2V output?
The LTC3388EDD-1#PBF requires VIN ≥ 2.7V to operate, regardless of selected output voltage. Below 2.7V, the part enters undervoltage lockout (UVLO) and disables regulation. For a 1.2V output, the absolute minimum functional VIN is 2.7V - though practical dropout margin requires VIN ≥ 1.5×VOUT (i.e., ≥1.8V) for reliable hysteretic control. The UVLO falling threshold is 2.3V, but regulation ceases before that point.
Can the output voltage of the LTC3388EDD-1#PBF be changed dynamically during operation?
No, the LTC3388EDD-1#PBF output voltage is set statically at power-up via D0 and D1 pin states and cannot be altered dynamically during regulation. While the datasheet shows PGOOD behavior during D0/D1 transitions, those changes require cycling EN or allowing VOUT to fully discharge and re-stabilize - not real-time adjustment. For programmable outputs, consider alternatives like the TPS62840DRVR.
Does the LTC3388EDD-1#PBF require an external compensation network?
No, the LTC3388EDD-1#PBF uses a hysteretic control architecture with internal compensation. No external RC network or feedback compensation components are needed - simplifying layout, reducing BOM count, and eliminating stability tuning. This architecture inherently supports wide input/output voltage ratios and ultra-light load conditions without phase-margin concerns.
How does the standby mode of the LTC3388EDD-1#PBF affect PGOOD functionality?
In standby mode (STBY = high), the LTC3388EDD-1#PBF disables buck switching but keeps the PGOOD comparator active as long as VOUT remains ≥92% of the selected output voltage. PGOOD stays Hi-Z during standby, providing uninterrupted power-good signaling to host systems - unlike disable mode (EN = low), which forces PGOOD low. This allows ripple-free operation while preserving system-level power sequencing integrity.
What is the maximum recommended output capacitance for stable operation of the LTC3388EDD-1#PBF?
The LTC3388EDD-1#PBF is stable with output capacitances from 10µF to 470µF. While larger capacitors extend sleep time and reduce ripple, values above 470µF may increase startup time and transient recovery latency. For optimal balance of ripple suppression and response, 47µF–100µF X7R ceramic capacitors are recommended - placed as close as possible to VOUT and GND pins to minimize ESL.
LTC3388EDD-1#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):
- 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#PBF FAQ
1.How can I place an order for LTC3388EDD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3388EDD-1#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 LTC3388EDD-1#PBF reliable?
The price and inventory of LTC3388EDD-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3388EDD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3388EDD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3388EDD-1#PBF?
LTC3388EDD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3388EDD-1#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 LTC3388EDD-1#PBF?
For technical support, including LTC3388EDD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3388EDD-1#PBF requirements.
6.How does Aetrix verify that LTC3388EDD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3388EDD-1#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 LTC3388EDD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3388EDD-1#PBF?
All LTC3388EDD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3388EDD-1#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 LTC3388EDD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3388EDD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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