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Analog Devices Inc. LTC3388EMSE-3#PBF
- Part No.:
- LTC3388EMSE-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3388EMSE-3#PBF.pdf
- Description:
- IC REG BUCK PROG 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,064
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Product details
Overview
LTC3388EMSE-3#PBF 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 at 4V input, pin-selectable 2.8V/3.0V/3.3V/5.0V outputs, 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 supplies.
For engineers reviewing the LTC3388EMSE-3#PBF datasheet, LTC3388EMSE-3#PBF pinout, LTC3388EMSE-3#PBF application, or LTC3388EMSE-3#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed output voltage selection logic, real-world efficiency curves across load and input voltage, and design-meaningful alternatives for nanopower buck conversion in space-constrained, long-life systems.
Technical Context
The LTC3388EMSE-3#PBF implements a hysteretic synchronous buck architecture with internal rail generation: CAP (gate drive for PMOS, regulated at VIN – 4.8V) and VIN2 (gate drive for NMOS and logic reference, 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), minimizing average IQ.
Its enable (EN) and standby (STBY) inputs support three distinct operating states: active regulation, low-ripple standby (buck disabled while output remains in regulation), and full shutdown (EN low). PGOOD is an open-drain NMOS output asserting Hi-Z when VOUT exceeds 92% of the target voltage - critical for system sequencing in battery-powered devices.
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 Quiescent Current (VIN = 4V) | 720nA typical - 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 resistors required. |
| Max Output Current | 50mA - sufficient for microcontrollers, RF transceivers, and precision analog circuitry in ultra-low-power nodes. |
| UVLO Threshold | 2.3V (typical falling) - prevents erratic operation during brownout while maintaining sub-µA shutdown IQ of 400nA. |
| PGOOD Accuracy | ±8% window (83–92% of VOUT) - ensures reliable power sequencing without overdesigning supervisor ICs. |
| Package | 10-Lead MSOP (MSE), 3mm × 3mm footprint - compatible with standard reflow processes and space-limited PCB layouts. |
Pinout & Package
Package: 10-Lead Plastic MSOP (MSE), exposed pad (Pin 11) connected to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input referenced to VIN2 | Logic-high enables buck regulation; logic-low disables all switching and pulls PGOOD low - used for system-level power gating. |
| STBY (Pin 2) | Standby mode control input referenced to VIN2 | Logic-high disables buck switching while preserving output regulation and PGOOD state - eliminates switching ripple for sensitive analog loads. |
| CAP (Pin 3) | Internal gate-drive rail for high-side PMOS | Must be bypassed with 1µF capacitor to VIN; not usable as external supply - ensures robust high-side drive under varying input conditions. |
| VIN (Pin 4) | Main input voltage supply | Accepts 2.7V–20V; requires ≥2.2µF ceramic bypass close to pin to suppress switching noise and EMI. |
| SW (Pin 5) | Switch node connecting internal PMOS/NMOS to external inductor | Drives 100µH (or 22µH) inductor; high dv/dt node requiring tight layout and ground shielding to minimize radiated emissions. |
| VOUT (Pin 6) | Output voltage sense and feedback point | Direct connection to output capacitor; internal feedback draws only 60–120nA - negligible loading on low-current outputs. |
| VIN2 (Pin 7) | Internal gate-drive rail for low-side NMOS and logic reference | Bypassed with 4.7µF capacitor to GND; serves as logic-high level for EN, STBY, D0, D1 - must not be loaded externally. |
| D1 (Pin 8) | MSB of output voltage select code | Tied high (to VIN2) or low (to GND) to configure one of four factory-programmed outputs - no configuration firmware needed. |
| D0 (Pin 9) | LSB of output voltage select code | Paired with D1 to set VOUT per Table 1 (e.g., D1=1/D0=0 → 3.3V); tolerant of dynamic reconfiguration during regulation. |
| PGOOD (Pin 10) | Open-drain power-good status output | Hi-Z when VOUT ≥92% of target; sinks current when below threshold - interfaces directly with µC reset or enable inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic synchronous buck control | Eliminates external compensation and enables stable regulation down to 10µA load with <1% output ripple in sleep mode. |
| Pin-selectable output voltages (LTC3388-3 family) | Four fixed outputs (2.8V/3.0V/3.3V/5.0V) configured without resistors - reduces BOM count and layout area in multi-voltage designs. |
| Standby mode with zero switching ripple | Disables buck switching while maintaining regulation via output capacitor hold-up - essential for ADC reference stability and RF receiver sensitivity. |
| Integrated UVLO with 400nA shutdown IQ | Guarantees clean startup and graceful shutdown across temperature; preserves battery capacity during storage or deep sleep. |
| Exposed-pad MSOP thermal performance | θJA = 45°C/W enables 50mA continuous output at +85°C ambient without heatsinking - simplifies thermal design in compact enclosures. |
Applications
| Wireless Sensor Node Power | Industrial PLC Auxiliary Supply |
|---|---|
Use Scenario: A battery-powered temperature/humidity sensor transmits data every 5 minutes using BLE, spending >99.9% of time in deep sleep. IC Role / Device Role / Timing Role: Primary 3.3V regulator supplying MCU, radio, and analog front-end; maintains regulation during 10µA sleep current. Use Value: 720nA no-load IQ extends CR2032 battery life beyond 10 years; standby mode eliminates RF interference during measurement windows. |
Use Scenario: Distributed I/O module in a factory automation system requires isolated 5.0V for digital logic and communication interfaces. IC Role / Device Role / Timing Role: Secondary buck regulator deriving 5.0V from a 24V industrial bus; handles transient surges up to 20V. Use Value: 20V max input rating avoids need for upstream TVS/clamping; ±16mV sleep hysteresis ensures stable 5.0V under variable load steps. |
| Portable Medical Monitor Keep-Alive | Smart Meter Real-Time Clock Supply |
Use Scenario: Handheld ECG device uses supercapacitor backup to retain settings and clock during main battery replacement. IC Role / Device Role / Timing Role: Low-noise 2.8V supply for RTC and SRAM retention; activated only when main supply drops below UVLO. Use Value: 400nA UVLO IQ minimizes supercapacitor discharge; PGOOD signal triggers graceful save-to-flash before power loss. |
Use Scenario: Electricity meter maintains accurate timekeeping and tamper logs during grid outages using a coin cell. IC Role / Device Role / Timing Role: 3.0V regulator powering RTC, nonvolatile memory, and secure crypto engine from lithium manganese dioxide cell. Use Value: 3.0V output matches common RTC voltage requirements; 125°C rated junction temp ensures reliability in sealed outdoor enclosures. |
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 (100nA), but max input 6V and max output current 300mA; uses I²C for voltage selection instead of pins. | Requires digital interface and external EEPROM for boot configuration; unsuitable for 20V input or pin-strapped simplicity. | Choose for ultra-low-IQ designs with ≤6V input and programmable voltage needs - not a drop-in replacement. |
| MAX17643ATB+T | Higher IQ (2.5µA), 36V input, 100mA output; pin-compatible 10-pin TDFN but different pinout and no standby mode. | Lacks standby mode and PGOOD accuracy; requires external feedback resistors for voltage setting. | Choose for higher input voltage and output current where 2.5µA IQ is acceptable - requires PCB redesign and new layout. |
Compared with TPS62840DRVR and MAX17643ATB+T, the LTC3388EMSE-3#PBF uniquely balances 20V input capability, pin-selectable outputs, sub-µA IQ, and standby-mode ripple suppression - making it optimal for cost-sensitive, space-constrained, and battery longevity-critical applications where digital control adds complexity.
Availability
LTC3388EMSE-3#PBF is available at Aetrix Electronics and suitable for wireless sensor nodes, industrial PLC auxiliary supplies, portable medical monitor keep-alive circuits, smart meter real-time clock supplies, and other applications requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3388EMSE-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 high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LTC3388 series belongs to Linear's nanopower DC/DC converter product line, designed specifically for energy-constrained systems such as IoT edge nodes, wearables, and battery-backed instrumentation where multi-year operation and minimal board area are mandatory.
FAQ
What is the maximum input voltage rating for the LTC3388EMSE-3#PBF?
The LTC3388EMSE-3#PBF has an absolute maximum input voltage of 22V, with guaranteed operation from 2.7V to 20V. Exceeding 22V risks permanent damage. Its 20V operational range allows direct connection to 12V/24V industrial buses with appropriate input filtering, eliminating the need for pre-regulators in many applications - a key advantage over lower-voltage alternatives like the TPS62840.
How does the standby mode of the LTC3388EMSE-3#PBF reduce output ripple?
In standby mode, the LTC3388EMSE-3#PBF disables buck switching entirely while maintaining regulation via the output capacitor's stored charge. This eliminates all switching-related ripple and EMI, resulting in near-DC output voltage - critical for noise-sensitive circuits like precision ADC references or RF receivers. The PGOOD signal remains asserted as long as VOUT stays above 92% of the target, ensuring system awareness of valid supply conditions.
Can the output voltage of the LTC3388EMSE-3#PBF be changed dynamically during operation?
Yes, the LTC3388EMSE-3#PBF supports dynamic reconfiguration of its output voltage by toggling D0 and D1 pins while in regulation. If transitioning to a higher output (e.g., 3.0V → 3.3V), PGOOD will go low until the new voltage is reached; if transitioning lower (e.g., 3.3V → 3.0V), PGOOD remains high throughout. This enables flexible power sequencing in multi-rail systems without requiring power cycle or reset.
What is the purpose of the CAP and VIN2 pins on the LTC3388EMSE-3#PBF?
CAP (Pin 3) is an internal rail regulated at VIN – 4.8V, providing gate drive for the high-side PMOS switch. VIN2 (Pin 7) is regulated at 4.6V above GND and serves dual roles: gate drive for the low-side NMOS switch and logic-high reference for EN, STBY, D0, and D1 inputs. Both require dedicated bypass capacitors (1µF and 4.7µF respectively) and must never be used as external power rails - doing so compromises regulation and may damage the IC.
Does the LTC3388EMSE-3#PBF require external feedback resistors to set its output voltage?
No, the LTC3388EMSE-3#PBF does not require external feedback resistors. Its output voltage is factory-trimmed and selected exclusively via the logic states of D0 and D1 pins (tied to GND or VIN2), offering four fixed options: 2.8V, 3.0V, 3.3V, or 5.0V. This eliminates resistor tolerance errors, saves PCB area, reduces BOM count, and avoids drift over temperature - distinguishing it from adjustable buck regulators like the MAX17643.
LTC3388EMSE-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
LTC3388EMSE-3#PBF FAQ
1.How can I place an order for LTC3388EMSE-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3388EMSE-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 LTC3388EMSE-3#PBF reliable?
The price and inventory of LTC3388EMSE-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 LTC3388EMSE-3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3388EMSE-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3388EMSE-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3388EMSE-3#PBF?
LTC3388EMSE-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3388EMSE-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 LTC3388EMSE-3#PBF?
For technical support, including LTC3388EMSE-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3388EMSE-3#PBF requirements.
6.How does Aetrix verify that LTC3388EMSE-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3388EMSE-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 LTC3388EMSE-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3388EMSE-3#PBF?
All LTC3388EMSE-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3388EMSE-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 LTC3388EMSE-3#PBF part is unused and in its original packaging.
Return procedure for LTC3388EMSE-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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