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Analog Devices Inc. LTC3388IMSE-3#PBF
- Part No.:
- LTC3388IMSE-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3388IMSE-3#PBF.pdf
- Description:
- IC REG BUCK PROG 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:198
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Product details
Overview
LTC3388IMSE-3#PBF from Analog Devices (formerly Linear Technology) is a 20V input, 50mA synchronous step-down DC/DC converter with nanopower quiescent current and pin-selectable 2.8V/3.0V/3.3V/5.0V output. It features 720nA no-load IQ at 4V VIN, undervoltage lockout (UVLO) at 2.3V, and standby mode for ultra-low ripple during short-duration loads - ideal for battery-powered IoT sensors and industrial keep-alive rails.
For engineers reviewing the LTC3388IMSE-3#PBF datasheet, LTC3388IMSE-3#PBF pinout, LTC3388IMSE-3#PBF application, or LTC3388IMSE-3#PBF equivalent, key selection criteria include its 10-lead MSOP package, hysteretic control architecture, 2.7V–20V input range, 400nA UVLO IQ, and precise PGOOD monitoring with 83–92% VOUT threshold hysteresis.
Technical Context
The LTC3388IMSE-3#PBF implements a hysteretic synchronous buck topology with internal PMOS/NMOS switches (100–210mA peak), eliminating external compensation and enabling stable operation with minimal external components. Its sleep-mode regulation relies on a low-power comparator monitoring VOUT against ±16mV hysteresis around the selected output voltage.
Two internal rails - CAP (VIN–4.8V) and VIN2 (regulated 4.6V) - power gate drivers and logic interfaces; VIN2 serves as reference for EN, STBY, D0, and D1 inputs. The device enters UVLO below 2.3V VIN, disables switching in STBY mode while retaining PGOOD/sleep monitoring, and maintains <1µA total IQ across 2.7–20V input range.
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 from 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, or 5.0V - selected via D0/D1 pins tied to GND or VIN2; no external resistors required. |
| UVLO Threshold | 2.3V (typical falling) - prevents erratic operation during brownout and preserves battery capacity. |
| PGOOD Accuracy | 83–92% of selected VOUT - provides reliable power sequencing and system reset signaling. |
| Switch On-Resistance | RP = 1.1Ω (PMOS), RN = 1.3Ω (NMOS) - minimizes conduction loss at light-to-moderate loads. |
Pinout & Package
Package: 10-Lead Plastic MSOP (MSE), 3mm × 3mm footprint, exposed thermal pad (Pin 11 = GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable input referenced to VIN2 | Logic-high enables buck regulation; driven to VIN2 avoids added 40nA IQ; pulls PGOOD low when disabled. |
| STBY (Pin 2) | Standby mode control | High disables buck switching while preserving PGOOD/sleep monitoring - reduces ripple during burst loads. |
| CAP (Pin 3) | PMOS gate drive rail | Internal rail at VIN–4.8V; requires 1µF bypass to VIN - not for external use. |
| VIN (Pin 4) | Main input supply | Accepts 2.7–20V; requires ≥2.2µF ceramic capacitor close to pin for EMI suppression. |
| SW (Pin 5) | Buck switch node | Connects to inductor (≥22µH); carries pulsed current up to 210mA peak. |
| VOUT (Pin 6) | Output voltage sense & feedback | Direct connection to output capacitor; internal feedback draws only 66–120nA depending on VOUT setting. |
| VIN2 (Pin 7) | NMOS gate drive & logic reference rail | Internally regulated 4.6V rail; powers D0/D1/EN/STBY logic and NMOS gate - requires 4.7µF bypass to GND. |
| D1 (Pin 8) | Output voltage select bit | Tied high/low to VIN2/GND to set VOUT per Table 1 (e.g., D1=0/D0=0 → 2.8V for LTC3388-3). |
| D0 (Pin 9) | Output voltage select bit | Second bit for 4-output selection; immune to noise when tied firmly - no pull-up/down resistors needed. |
| PGOOD (Pin 10) | Open-drain power-good indicator | Hi-Z when VOUT ≥92% of target; sinks current when below 83%; drives MCU I/O directly. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic synchronous buck control | Eliminates external compensation and enables stable, low-noise operation with 100µH inductors and 47–100µF output caps. |
| Ultra-low quiescent current sleep mode | 720nA typical IQ in regulation - extends battery life in always-on monitoring applications by >10× vs conventional buck regulators. |
| Pin-selectable output voltages | Four factory-trimmed outputs (2.8V/3.0V/3.3V/5.0V) configured via D0/D1 - removes need for feedback resistors and saves PCB area. |
| Integrated UVLO and PGOOD | 2.3V UVLO prevents startup under weak battery conditions; PGOOD with 9% hysteresis ensures robust power sequencing. |
| Standby mode with active monitoring | Disables switching while maintaining PGOOD and sleep comparator - delivers clean, low-ripple output during transient load bursts. |
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 LoRaWAN. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator supplying MCU, radio, and analog front-end with <1µA average system IQ. Use Value: Enables >10-year operation from CR2032 cell due to 720nA no-load IQ and efficient light-load hysteretic control. |
Use Scenario: Backup power for volatile memory and real-time clock in programmable logic controller during AC mains interruption. IC Role / Device Role / Timing Role: Always-on 5.0V auxiliary rail powered from supercapacitor or backup battery, maintaining critical state during brownout. Use Value: UVLO at 2.3V prevents false resets; PGOOD holds MCU reset until VOUT stabilizes - ensures deterministic fail-safe behavior. |
| Distributed Battery Management System | Low-Power Industrial Data Logger |
Use Scenario: Cell-level monitoring IC powered from single Li-ion cell (3.0–4.2V) in multi-cell BMS stack. IC Role / Device Role / Timing Role: Local 2.8V supply for ADC, isolation driver, and digital interface - isolated from main pack voltage. Use Value: Input range down to 2.7V allows operation through full cell discharge; 400nA UVLO IQ minimizes self-discharge during storage. |
Use Scenario: Environmental data logger sampling temperature/pressure every hour and storing to FRAM using coin-cell battery. IC Role / Device Role / Timing Role: 3.0V rail for microcontroller and serial flash, activated only during measurement cycles. Use Value: Standby mode eliminates switching noise during sleep - preserves measurement accuracy and reduces EMI-sensitive analog paths. |
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 300nA IQ but limited to 6V max VIN; fixed 1.8V/3.3V outputs only; no pin-selectable VOUT. | Suitable for sub-6V coin-cell apps where output flexibility is not required; lacks UVLO hysteresis and PGOOD accuracy specs. | Choose TPS62840DRVR only if input never exceeds 6V and fixed output suffices - LTC3388IMSE-3#PBF remains superior for 20V-tolerant, multi-voltage designs. |
| MAX17651ATB+T | Higher 1.2µA IQ; supports 4.5–60V input; requires external feedback resistors; no integrated PGOOD. | Targeted at high-voltage industrial inputs (>20V); adds complexity with resistor network and external monitoring circuitry. | Select MAX17651ATB+T only when input exceeds 20V - LTC3388IMSE-3#PBF offers better IQ, simpler layout, and tighter VOUT accuracy for ≤20V systems. |
Compared with TPS62840DRVR and MAX17651ATB+T, the LTC3388IMSE-3#PBF uniquely combines 20V input tolerance, pin-selectable outputs, <1µA IQ, and integrated PGOOD - delivering lowest system-level BOM count and longest battery life in 2.7–20V nanopower applications.
Availability
LTC3388IMSE-3#PBF is available at Aetrix Electronics and suitable for wireless sensor nodes, industrial PLC keep-alive rails, and distributed battery management systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3388IMSE-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 continues its legacy of precision power management ICs for demanding industrial, automotive, and instrumentation applications.
The LTC3388 series was designed specifically for ultra-low-power, wide-input DC/DC conversion in battery- and energy-harvesting–powered systems - emphasizing nanopower IQ, high light-load efficiency, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LTC3388IMSE-3#PBF?
The LTC3388IMSE-3#PBF has an absolute maximum input voltage of 22V, with recommended continuous operation up to 20V. Exceeding 22V may cause permanent damage. Its 2.7V–20V operating range makes it suitable for 12V/24V industrial rails and multi-cell battery stacks without external clamping.
How does the LTC3388IMSE-3#PBF achieve 720nA quiescent current?
The LTC3388IMSE-3#PBF achieves 720nA typical input quiescent current through a combination of deep-sleep mode (disabling switching and most internal circuitry), optimized CMOS design, and hysteretic control that eliminates continuous oscillator and error amplifier current. In sleep, only the VOUT monitor comparator remains active.
Can the output voltage of the LTC3388IMSE-3#PBF be changed dynamically during operation?
Yes - the LTC3388IMSE-3#PBF supports dynamic VOUT reconfiguration by toggling D0/D1 pins while in regulation. If transitioning to a higher output voltage, PGOOD will go low until VOUT reaches the new target; for lower voltages, PGOOD remains asserted throughout the transition.
What is the purpose of the CAP and VIN2 pins on the LTC3388IMSE-3#PBF?
CAP (Pin 3) is an internal rail at VIN–4.8V used to drive the high-side PMOS gate; VIN2 (Pin 7) is a regulated 4.6V rail powering the low-side NMOS gate and serving as logic reference for EN, STBY, D0, and D1. Neither pin is intended for external use - both require dedicated bypass capacitors (1µF and 4.7µF respectively).
Does the LTC3388IMSE-3#PBF require an external compensation network?
No - the LTC3388IMSE-3#PBF uses a hysteretic control architecture that requires no external compensation components. Stability is inherent to the topology and achieved with standard output capacitors (≥47µF) and inductors (≥22µH), simplifying design and reducing BOM count.
LTC3388IMSE-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3388IMSE-3#PBF FAQ
1.How can I place an order for LTC3388IMSE-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3388IMSE-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 LTC3388IMSE-3#PBF reliable?
The price and inventory of LTC3388IMSE-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 LTC3388IMSE-3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3388IMSE-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3388IMSE-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3388IMSE-3#PBF?
LTC3388IMSE-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3388IMSE-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 LTC3388IMSE-3#PBF?
For technical support, including LTC3388IMSE-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3388IMSE-3#PBF requirements.
6.How does Aetrix verify that LTC3388IMSE-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3388IMSE-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 LTC3388IMSE-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3388IMSE-3#PBF?
All LTC3388IMSE-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3388IMSE-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 LTC3388IMSE-3#PBF part is unused and in its original packaging.
Return procedure for LTC3388IMSE-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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