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Analog Devices Inc. LTC3388EMSE-3#TRPBF
- Part No.:
- LTC3388EMSE-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3388EMSE-3#TRPBF.pdf
- Description:
- IC REG BUCK PROG 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,154
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Product details
Overview
LTC3388EMSE-3#TRPBF from Analog Devices (formerly Linear Technology) is a 20V-input, 50mA synchronous step-down DC/DC converter in a 10-lead MSOP package, featuring 720nA no-load quiescent current, pin-selectable 2.8V/3.0V/3.3V/5.0V outputs, and integrated high-side PMOS and low-side NMOS switches. It delivers ultra-low-power regulation for battery-backed keep-alive rails in portable medical sensors and industrial IoT nodes.
For engineers reviewing the LTC3388EMSE-3#TRPBF datasheet, LTC3388EMSE-3#TRPBF pinout, LTC3388EMSE-3#TRPBF application, or LTC3388EMSE-3#TRPBF equivalent, key selection criteria include its 2.7V–20V input range, standby mode with disabled buck switching, UVLO threshold at 2.3V, and guaranteed operation from –40°C to 125°C junction temperature.
Technical Context
The LTC3388EMSE-3#TRPBF implements a hysteretic synchronous buck topology with internal rail generation (CAP at VIN–4.8V, VIN2 at 4.6V), enabling self-contained gate drive without external bias supplies. Its sleep comparator monitors VOUT against ±16mV hysteresis around the selected output voltage, triggering burst-mode switching only when regulation is lost.
Control logic uses D0/D1 pins referenced to VIN2 to select one of four fixed output voltages; EN enables the regulator while STBY disables switching but retains PGOOD monitoring. The device maintains <1µA total input IQ across 2.7V–20V input range and supports up to 50mA continuous output current with peak switch current of 210mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 20V - supports wide-range industrial and automotive supply rails without external pre-regulation |
| No-Load Quiescent Current | 720nA at VIN = 4V - enables multi-year battery life in always-on sensor nodes |
| Output Voltage Options | 2.8V / 3.0V / 3.3V / 5.0V - selected via D0/D1 pin states; no external feedback resistors required |
| UVLO Threshold | 2.3V (falling) - prevents erratic operation during brownout or battery depletion |
| Max Output Current | 50mA - sufficient for microcontrollers, RTCs, and low-power transceivers |
| Switch On-Resistance | RP = 1.1Ω, RN = 1.3Ω - minimizes conduction loss at light loads |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Package: 10-Lead Plastic MSOP (MSE), 3mm × 3mm footprint, exposed pad (Pin 11) soldered to PCB ground plane for thermal and electrical integrity.
| 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 |
| STBY (Pin 2) | Standby mode input referenced to VIN2 | High disables buck switching while preserving PGOOD state and sleep monitoring |
| CAP (Pin 3) | PMOS gate drive rail (VIN – 4.8V) | Requires 1µF bypass capacitor; not usable as system supply rail |
| VIN (Pin 4) | Main input power connection | Accepts 2.7V–20V; requires ≥2.2µF ceramic bypass capacitor |
| SW (Pin 5) | Switch node between internal PMOS/NMOS | Connects to inductor; high dv/dt node requiring tight layout |
| VOUT (Pin 6) | Output voltage sense and regulation point | Direct connection to output capacitor; internal feedback reference |
| VIN2 (Pin 7) | NMOS gate drive and logic high rail | Regulated at 4.6V; powers D0/D1/EN/STBY logic; requires 4.7µF bypass |
| D1 (Pin 8) | MSB of output voltage select | Tied to GND or VIN2 to configure one of four factory-set VOUT options |
| D0 (Pin 9) | LSB of output voltage select | Combined with D1, selects 2.8V/3.0V/3.3V/5.0V per Table 1 |
| PGOOD (Pin 10) | Open-drain power-good indicator | Hi-Z when VOUT ≥92% of target; remains asserted during UVLO transition |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic synchronous buck control | Eliminates external compensation and enables stable regulation with minimal output capacitance |
| Pin-selectable output voltages | Four fixed outputs (2.8V/3.0V/3.3V/5.0V) set by D0/D1 logic levels-no resistor network needed |
| Standby mode with active PGOOD | Disables switching to reduce ripple and noise while maintaining power-good status for host processors |
| Internal rail generation (CAP/VIN2) | Self-contained gate drive eliminates need for external bias supplies or charge pumps |
| Ultra-low quiescent current sleep state | 720nA IQ at 4V input ensures >10-year battery life in 10µA-load applications |
Applications
| Medical Wearables | Industrial Sensor Nodes |
|---|---|
Use Scenario: Continuous ECG monitoring in disposable patch sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Primary 3.0V keep-alive regulator for MCU and analog front-end during deep-sleep cycles. Use Value: 720nA no-load IQ extends battery life beyond 3 years; standby mode suppresses switching noise during signal acquisition. | Use Scenario: Wireless vibration sensor on rotating machinery with 10-year maintenance interval. IC Role / Device Role / Timing Role: 3.3V supply for low-power MCU, MEMS accelerometer, and sub-GHz RF transceiver. Use Value: 2.7V–20V input range accommodates degraded battery or wide-voltage industrial bus; UVLO prevents reset instability during brownout. |
| Smart Meter Backup Power | Automotive Body Control Modules |
Use Scenario: Real-time clock and memory retention during main power failure in electricity meters. IC Role / Device Role / Timing Role: 2.8V regulated rail sourced from supercapacitor or backup battery. Use Value: PGOOD remains asserted after VIN drops below UVLO, allowing controlled shutdown using stored energy. | Use Scenario: Always-on CAN transceiver and wake-up logic in vehicle door modules. IC Role / Device Role / Timing Role: 5.0V supply for CAN PHY and microcontroller I/O during sleep mode. Use Value: –40°C to 125°C operation meets AEC-Q100 Grade 2 requirements; 20V max input withstands load-dump transients. |
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 only 1.8V–5.5V input; no UVLO; requires external feedback resistors | Suitable for single-cell Li-ion systems where input range is constrained | Choose TPS62840DRVR if lowest possible IQ is critical and input stays above 1.8V |
| MAX17651ATC+ | Higher 1.2µA IQ, wider 4.5V–60V input, but larger 12-pin TDFN package and no pin-selectable outputs | Better suited for 24V industrial rails with higher current demands (up to 100mA) | Choose MAX17651ATC+ when input exceeds 20V or higher output current is required |
Compared with TPS62840DRVR and MAX17651ATC+, the LTC3388EMSE-3#TRPBF uniquely balances ultra-low IQ, wide 2.7V–20V input, pin-selectable outputs, and full automotive-grade temperature range in a compact MSOP package-making it optimal for space-constrained, long-life battery systems.
Availability
LTC3388EMSE-3#TRPBF is available at Aetrix Electronics and suitable for medical wearables, industrial sensor nodes, smart meter backup power, and automotive body control modules requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3388EMSE-3#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 acquired Linear Technology in 2017 and continues its legacy of precision power management ICs with industry-leading efficiency and quiescent current performance.
The LTC3388 product line was designed specifically for ultra-low-power, long-duration applications such as battery-powered IoT endpoints, medical telemetry, and industrial monitoring systems where nanoscale IQ and wide input range are mandatory.
FAQ
What output voltage does LTC3388EMSE-3#TRPBF deliver by default?
LTC3388EMSE-3#TRPBF has no default output voltage-it delivers 2.8V, 3.0V, 3.3V, or 5.0V based solely on the logic states of D0 and D1 pins tied to GND or VIN2. For example, D1=0/D0=0 selects 2.8V; D1=1/D0=1 selects 5.0V. No external resistors or programming is required, and the output is fixed per pin configuration.
Can LTC3388EMSE-3#TRPBF operate with input voltage below 2.7V?
No. LTC3388EMSE-3#TRPBF is specified for 2.7V minimum input voltage per absolute maximum ratings and electrical characteristics. Below 2.7V, the device enters undervoltage lockout (UVLO) and draws only ~400nA quiescent current. Operation below 2.7V is not guaranteed and may result in unregulated output or erratic PGOOD behavior.
How does standby mode affect PGOOD functionality in LTC3388EMSE-3#TRPBF?
In standby mode (STBY = high), LTC3388EMSE-3#TRPBF disables buck switching but keeps the sleep comparator and PGOOD circuitry active. PGOOD remains Hi-Z as long as VOUT stays above 92% of the selected output voltage-even while the regulator is silent. This allows host systems to monitor rail health without switching noise.
Is LTC3388EMSE-3#TRPBF pin-compatible with LTC3388EMSE-1#TRPBF?
Yes-LTC3388EMSE-3#TRPBF and LTC3388EMSE-1#TRPBF share identical pinout, package (10-lead MSOP), and electrical interface. The only difference is output voltage selection: LTC3388EMSE-1#TRPBF offers 1.2V/1.5V/1.8V/2.5V, while LTC3388EMSE-3#TRPBF offers 2.8V/3.0V/3.3V/5.0V. PCB layout and support components are fully interchangeable.
What is the maximum recommended output capacitor value for LTC3388EMSE-3#TRPBF?
LTC3388EMSE-3#TRPBF supports output capacitors up to 470µF, though 100µF is typical for optimal transient response and sleep-time predictability. Larger values extend sleep duration and reduce ripple but increase start-up time and inrush current. Ceramic X7R/X5R types are preferred; avoid high-ESR electrolytics unless damping is required for input ringing.
LTC3388EMSE-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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):
- 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
LTC3388EMSE-3#TRPBF FAQ
1.How can I place an order for LTC3388EMSE-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3388EMSE-3#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 LTC3388EMSE-3#TRPBF reliable?
The price and inventory of LTC3388EMSE-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3388EMSE-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3388EMSE-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3388EMSE-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3388EMSE-3#TRPBF?
LTC3388EMSE-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3388EMSE-3#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 LTC3388EMSE-3#TRPBF?
For technical support, including LTC3388EMSE-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3388EMSE-3#TRPBF requirements.
6.How does Aetrix verify that LTC3388EMSE-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3388EMSE-3#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 LTC3388EMSE-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3388EMSE-3#TRPBF?
All LTC3388EMSE-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3388EMSE-3#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 LTC3388EMSE-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3388EMSE-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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