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Analog Devices Inc. LTC3388IDD-3
- Part No.:
- LTC3388IDD-3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3388IDD-3.pdf
- Description:
- IC REG BUCK PROG 50MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,342
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Product details
Overview
LTC3388IDD-3 from Analog Devices (formerly Linear Technology) is a 20V input, 50mA synchronous step-down DC/DC converter with nanopower quiescent current (720nA at 4V VIN, no load), pin-selectable 2.8V/3.0V/3.3V/5.0V output, and integrated high-side PMOS and low-side NMOS switches. It delivers regulated power for ultra-low-power keep-alive circuits in battery-operated industrial sensors and portable medical devices.
For engineers reviewing the LTC3388IDD-3 datasheet, LTC3388IDD-3 pinout, LTC3388IDD-3 application, or LTC3388IDD-3 equivalent, this page provides verified pin functions, confirmed 10-lead 3mm × 3mm DFN package details, validated standby mode behavior, and two field-tested alternative parts with documented voltage/output differences.
Technical Context
The LTC3388IDD-3 implements a hysteretic synchronous buck topology with internal rail generation: CAP (gate drive for PMOS, regulated at VIN − 4.8V) and VIN2 (gate drive/logic rail for NMOS and D0/D1, regulated at 4.6V). It operates in sleep mode during light loads, waking only when VOUT falls below the sleep threshold (±16mV for LTC3388-3 variants).
UVLO disables regulation below 2.3V (typical falling threshold), while standby mode (STBY = high) disables switching but retains PGOOD and sleep comparator functionality. Output voltage is selected via D0/D1 logic levels tied to VIN2 or GND, with four fixed options exclusive to the LTC3388-3 family variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 20V - supports wide-input battery and industrial supply rails without external pre-regulation. |
| No-Load Quiescent Current | 720nA at VIN = 4V - enables multi-year operation on coin cells or energy-harvesting sources. |
| Output Current Capability | 50mA continuous - sufficient for microcontrollers, RF transceivers, and sensor signal chains. |
| Output Voltage Options | 2.8V, 3.0V, 3.3V, 5.0V (pin-selectable via D0/D1) - eliminates external feedback resistors and simplifies BOM. |
| UVLO Threshold | 2.3V (typical falling) - prevents brownout operation while preserving battery capacity. |
| Standby Quiescent Current | 720nA (sleeping) / 2000nA (not sleeping) at VIN = 4V - maintains system state with minimal drain during idle periods. |
| Package | 10-lead 3mm × 3mm DFN (DD) with exposed thermal pad - enables compact, thermally efficient PCB layouts. |
Pinout & Package
Package: 10-lead plastic DFN (3mm × 3mm), exposed pad (Pin 11) connected to GND. Requires soldering of 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; driving to VIN2 adds zero extra IQ; critical for system-level power sequencing. |
| STBY (Pin 2) | Standby mode control referenced to VIN2 | High disables switching while retaining PGOOD and sleep monitoring - ideal for burst-mode wake-up systems. |
| CAP (Pin 3) | PMOS gate drive rail | Internal rail at VIN − 4.8V; requires 1µF bypass to VIN - not usable as external supply rail. |
| VIN (Pin 4) | Main input voltage supply | Accepts 2.7–20V; requires ≥2.2µF ceramic bypass close to pin to minimize EMI and support switching current. |
| 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 and regulation point | Directly monitors regulated output; internal feedback draws only 66–120nA depending on selected voltage. |
| VIN2 (Pin 7) | NMOS gate drive and logic reference rail | Internal 4.6V rail; powers D0/D1/EN/STBY logic and NMOS gate - requires 4.7µF bypass; not for external use. |
| D1 (Pin 8) | MSB of output voltage select | Tied to VIN2 (high) or GND (low) to set one of four LTC3388-3 output voltages - stable during regulation. |
| D0 (Pin 9) | LSB of output voltage select | Paired with D1; both pins referenced to VIN2 - enables hardware-programmed VOUT without firmware or EEPROM. |
| PGOOD (Pin 10) | Open-drain power-good indicator | Hi-Z when VOUT ≥ 92% of target; sinks current when below threshold - drives MCU reset or status GPIO directly. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic synchronous buck control | Eliminates external compensation and enables >90% efficiency at 10µA–50mA loads without frequency instability. |
| Pin-selectable output voltages | Four factory-set outputs (2.8V/3.0V/3.3V/5.0V) reduce design iteration time and eliminate resistor tolerance errors. |
| Standby mode with active monitoring | Disables switching losses while maintaining PGOOD and sleep comparator - preserves system awareness during idle. |
| Integrated dual-rail generation | CAP and VIN2 rails generated internally eliminate need for external LDOs or charge pumps in space-constrained designs. |
| UVLO with hysteresis | 2.3V falling / 2.5V rising thresholds prevent oscillation near battery depletion and extend usable cell life. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Long-life wireless temperature/humidity sensor powered by CR2032 coin cell, transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Primary 3.3V regulator supplying MCU, BLE radio, and analog front-end; enters sleep between transmissions. Use Value: 720nA no-load IQ extends battery life beyond 5 years; standby mode cuts switching noise during RF receive windows. |
Use Scenario: Wearable ECG patch requiring continuous 3.0V bias for analog signal chain and low-noise ADC. IC Role / Device Role / Timing Role: Always-on power source for analog section; maintains regulation during intermittent MCU activity. Use Value: ±16mV sleep hysteresis ensures <10mV output ripple; PGOOD confirms stable rail before ADC sampling. |
| Smart Meter Backup Supply | IoT Edge Node Controller |
|
Use Scenario: Secondary 5.0V rail in utility meter, energized from supercapacitor during main power outage. IC Role / Device Role / Timing Role: Keep-alive regulator sustaining real-time clock and nonvolatile memory during grid failure. Use Value: 2.3V UVLO allows operation down to near-empty supercap; 50mA capability supports RTC + FRAM write cycles. |
Use Scenario: Gateway device aggregating LoRaWAN sensor data, powered by LiSOCl₂ primary battery. IC Role / Device Role / Timing Role: Main 2.8V supply for ARM Cortex-M4 MCU and crypto accelerator during active bursts. Use Value: Pin-selectable 2.8V matches MCU core voltage spec; D0/D1 reconfiguration enables single-BOM multi-voltage variants. |
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), fixed 1.8V output, 1.2–5.5V input, 1A output - no pin-selectable voltages or standby mode. | Suitable for ultra-low-IQ apps where fixed 1.8V suffices; lacks LTC3388IDD-3's 20V input and programmable VOUT. | Select TPS62840DRVR only if 1.8V matches system needs and 20V input headroom is unnecessary. |
| MAX17651ATP+ | 2.5–42V input, 50mA, 3.3V fixed output, 1.5µA IQ - includes enable/PGOOD but no standby or pin-selectable VOUT. | Supports higher input voltages than LTC3388IDD-3 but trades off nanopower IQ for wider VIN range. | Choose MAX17651ATP+ when input exceeds 20V and 1.5µA IQ is acceptable; avoid if coin-cell lifetime is critical. |
Compared with TPS62840DRVR and MAX17651ATP+, the LTC3388IDD-3 uniquely combines 20V input tolerance, pin-selectable outputs, sub-µA IQ, and standby mode - making it optimal for battery-powered industrial nodes needing flexible, long-life regulation.
Availability
LTC3388IDD-3 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart meter backup supplies, and IoT edge controllers requiring stable component supply across extended product lifecycles.
Supply support for LTC3388IDD-3 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 precision power management ICs for demanding industrial and medical applications.
The LTC3388IDD-3 belongs to the LTC® nanopower DC/DC converter family, designed specifically for ultra-low-quiescent-current applications where battery life, reliability, and minimal external components are critical.
FAQ
What is the guaranteed operating temperature range for the LTC3388IDD-3?
The LTC3388IDD-3 is rated for –40°C to 125°C junction temperature. This I-grade part is qualified across that full range, with specifications assured by design, characterization, and statistical process controls - unlike E-grade variants limited to 0°C–85°C. The LTC3388IDD-3 maintains 720nA no-load IQ and accurate UVLO thresholds throughout this range.
Can the LTC3388IDD-3 be used with input voltages below 2.7V?
No. The absolute minimum input voltage for the LTC3388IDD-3 is 2.7V per datasheet specifications. Below this, the internal rail generation (CAP and VIN2) fails to start, preventing proper gate drive and regulation. Attempting operation at 2.5V will result in UVLO lockout and no output - the part remains in 400nA shutdown state until VIN rises above 2.7V.
How does the standby mode affect PGOOD behavior on the LTC3388IDD-3?
In standby mode (STBY = high), the LTC3388IDD-3 disables buck switching but keeps the sleep comparator and PGOOD circuitry active. PGOOD remains Hi-Z as long as VOUT stays ≥92% of the selected output voltage. If VOUT drops below that threshold, PGOOD pulls low - enabling reliable system reset even during standby. This differs from full disable (EN = low), where PGOOD is forced low.
What is the maximum inductor value recommended for the LTC3388IDD-3?
The LTC3388IDD-3 supports inductors up to 100µH, as validated in efficiency curves (Figures G22–G29). Larger values (e.g., 100µH) extend sleep time and reduce ripple at ultra-light loads (<10µA), while smaller values (22µH) improve transient response at higher loads (≥10mA). Inductor saturation current must exceed 210mA peak, and DCR should be minimized to preserve efficiency.
Does the LTC3388IDD-3 require external feedback resistors to set output voltage?
No. The LTC3388IDD-3 uses internal feedback and pin-selectable outputs. D0 and D1 terminals - tied to VIN2 (high) or GND (low) - configure one of four factory-trimmed output voltages (2.8V, 3.0V, 3.3V, or 5.0V). No external resistors are needed, eliminating tolerance errors, layout area, and BOM cost - a key differentiator from adjustable buck regulators.
LTC3388IDD-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3388IDD-3 FAQ
1.How can I place an order for LTC3388IDD-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3388IDD-3 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 reliable?
The price and inventory of LTC3388IDD-3 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 is usually 5 days.
3.What payment methods are accepted for LTC3388IDD-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3388IDD-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3388IDD-3?
LTC3388IDD-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3388IDD-3 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?
For technical support, including LTC3388IDD-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3388IDD-3 requirements.
6.How does Aetrix verify that LTC3388IDD-3 is sourced from the original manufacturer or authorized distributors?
All LTC3388IDD-3 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 meets industry standards.
7.What is the process for return or replacement of LTC3388IDD-3?
All LTC3388IDD-3 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3388IDD-3, 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 part is unused and in its original packaging.
Return procedure for LTC3388IDD-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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