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Analog Devices Inc. LTC3402EMS#PBF
- Part No.:
- LTC3402EMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3402EMS#PBF.pdf
- Description:
- IC REG BOOST ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
LTC3402EMS#PBF from Analog Devices (formerly Linear Technology) is a micropower, synchronous step-up DC/DC converter with integrated 0.16Ω N-channel and 0.18Ω P-channel MOSFETs, operating from 0.5V input down to 0.85V startup voltage, delivering up to 2A switch current at adjustable 2.6V–5.5V output, optimized for battery-powered portable electronics requiring high efficiency at light loads.
For engineers reviewing the LTC3402EMS#PBF datasheet, LTC3402EMS#PBF pinout, LTC3402EMS#PBF application, or LTC3402EMS#PBF equivalent, key selection considerations include Burst Mode® quiescent current (38μA), 3MHz programmable switching frequency, OPTI-LOOP® compensation, antiringing control, and open-drain PGOOD output - all in a thermally enhanced 10-pin MSOP package.
Technical Context
The LTC3402EMS#PBF employs current-mode control with adaptive slope compensation for stable loop response across wide VIN/VOUT ranges. Its dual-MOSFET synchronous rectification eliminates external Schottky diode requirements below 4.3V output, achieving up to 97% efficiency while minimizing conduction losses.
Burst Mode® operation is user-enabled via the MODE/SYNC pin and reduces quiescent current to 38μA under light load by entering sleep cycles; fixed-frequency mode (up to 3MHz) is selected via external Rt resistor or external clock synchronization, supporting noise-sensitive RF applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.5V to 5V - supports single-cell alkaline, NiMH, or LiFePO₄ sources without pre-bias start-up limitation. |
| Output Voltage Range | 2.6V to 5.5V - adjustable via external resistor divider; feedback reference is 1.25V ±3%. |
| Switch Current Limit | 2A typical - enables 1A continuous output at high efficiency with proper thermal layout on 4-layer board (θJA = 100°C/W). |
| Quiescent Current | 38μA in Burst Mode® - extends battery life in standby or intermittent-use portable devices like GPS receivers and pagers. |
| Switching Frequency | Programmable up to 3MHz via Rt pin - allows compact magnetics and ceramic capacitors; synchronizable to external clock. |
| Startup Voltage | 0.85V typical - enables operation directly from partially discharged single-cell batteries. |
| Shutdown Current | <1μA - ensures negligible drain during system sleep or storage. |
Pinout & Package
The LTC3402EMS#PBF is housed in a 10-lead thermally enhanced MSOP package (3.0mm × 3.0mm × 1.1mm), featuring exposed pad for improved thermal dissipation and compatible with standard reflow profiles (lead-free #PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Rt (Pin 1) | Oscillator timing input | Connects external resistor to ground to set switching frequency (f = 3×10¹⁰/Rt Hz); enables synchronization when driven by external clock. |
| MODE/SYNC (Pin 2) | Operating mode control | High = Burst Mode® enabled; low = fixed-frequency operation; external clock = synchronized mode with Burst disabled. |
| VIN (Pin 3) | Main input supply | Accepts 0.5V–5V input; powers internal circuitry until VOUT exceeds ~2.3V, then IC self-biases from VOUT. |
| SW (Pin 4) | Power switch node | Connects to inductor and optional Schottky diode; rated –0.5V to 6V; requires short trace routing to minimize EMI and ringing. |
| GND (Pin 5) | Signal and power ground | Common return for analog and power paths; must be connected to exposed pad for optimal thermal and electrical performance. |
| PGOOD (Pin 6) | Open-drain power-good flag | Asserts low when FB voltage drops >9% below regulation threshold; used for system sequencing and fault monitoring. |
| VOUT (Pin 7) | Regulated output and bootstrap source | Delivers regulated output; supplies bootstrapped gate drive for P-channel MOSFET; requires ≥1μF ceramic capacitor placed adjacent to GND. |
| FB (Pin 8) | Feedback input | Monitors output via resistor divider; internal 1.25V reference enables precise output adjustment with ≤50nA input bias current. |
| VC (Pin 9) | Error amplifier output | Connects external compensation network (RZ, CZ, CC); transconductance = 85μmhos; supports OPTI-LOOP® stability optimization. |
| SHDN (Pin 10) | Enable/disable control | Ground = shutdown (<1μA IQ); >1V = active; supports hysteresis networks for ultra-low-VIN operation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.16Ω NMOS + 0.18Ω PMOS switches eliminate external Schottky diode need for VOUT < 4.3V, reducing BOM count and conduction loss. |
| Burst Mode® operation | User-selectable via MODE/SYNC pin; reduces IQ to 38μA at light loads while maintaining regulation, extending battery runtime in portable instrumentation. |
| Antiringing control | Active damping circuit suppresses high-frequency SW-node ringing during discontinuous conduction mode, lowering EMI without snubbers. |
| OPTI-LOOP® compensation | Transconductance error amp (85μmhos) with VC pin interface simplifies loop compensation for fast transient response and robust stability across line/load variations. |
| Low-voltage start-up | Starts reliably at 0.85V input - enables direct use with single-cell batteries even under partial discharge, eliminating need for charge-pump assist circuits. |
Applications
| Cellular Telephones | Handheld Computers |
|---|---|
Use Scenario: Powering baseband processor core voltage from single Li-ion cell (2.5V–4.2V) while maintaining RF isolation. IC Role / Device Role / Timing Role: Synchronous boost regulator providing clean, regulated 3.3V rail with Burst Mode® for standby efficiency and 3MHz switching to avoid IF bands. Use Value: Enables >95% efficiency at 10mA load and <3% output ripple, meeting stringent EMI limits for cellular certification. | Use Scenario: Generating 5V USB peripheral bus power from 3.3V system rail in ruggedized industrial PDAs. IC Role / Device Role / Timing Role: Fixed-frequency (1MHz) step-up converter with PGOOD monitoring for safe hot-plug detection and sequencing. Use Value: Delivers 500mA continuous output with <100mV AC ripple and thermal shutdown protection under sustained load. |
| MP3 Players | GPS Receivers |
Use Scenario: Supplying 3.3V audio DAC and flash memory interface from single alkaline cell (0.9V–1.5V). IC Role / Device Role / Timing Role: Micropower boost converter using Burst Mode® to maintain >85% efficiency at 5mA playback current. Use Value: Extends battery life by 3.2× versus fixed-frequency operation at light loads, verified per Figure 3402 G05. | Use Scenario: Providing stable 3.0V LNA and GPS baseband supply from partially depleted NiMH cell (0.8V–1.2V). IC Role / Device Role / Timing Role: Ultra-low-startup boost regulator with antiringing control to prevent GPS signal corruption from switching noise. Use Value: Achieves 0.85V start-up and maintains <10mV RMS output noise at 1.5MHz switching, ensuring C/N₀ > 42dB-Hz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3401EMS#PBF | 1A switch rating (vs 2A), identical 10-pin MSOP package and pinout; same Burst Mode®, OPTI-LOOP®, and 0.5V–5V input range. | Lower output current capability suits sub-500mA applications; preferred where thermal budget or cost constraints limit full 2A requirement. | Select LTC3401EMS#PBF when peak load current remains ≤800mA and board space or BOM cost optimization is prioritized. |
| LTC3424EMS#PBF | Fixed 1.5V output (non-adjustable), same 2A switch, 3MHz max frequency, and 0.5V–5V input; lacks PGOOD and MODE/SYNC flexibility. | Targeted specifically for single-cell-to-1.5V logic rails (e.g., low-voltage microcontrollers); no external feedback or Burst Mode® enable. | Choose LTC3424EMS#PBF only for fixed 1.5V applications where simplicity and guaranteed low-noise 1.5V output outweigh programmability needs. |
Compared with LTC3401EMS#PBF, the LTC3402EMS#PBF delivers double the switch current for higher-power peripherals; versus LTC3424EMS#PBF, it offers full output adjustability and system-level control features (PGOOD, Burst Mode® enable, sync), making it suitable for flexible multi-rail portable designs.
Availability
LTC3402EMS#PBF is available at Aetrix Electronics and suitable for cellular telephones, handheld computers, and GPS receivers requiring stable component supply, long-term manufacturability, and guaranteed lead-free compliance.
Supply support for LTC3402EMS#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 full technical and manufacturing continuity for all Linear power products, including rigorous AEC-Q200-aligned reliability testing and extended temperature grade options.
The LTC3402EMS#PBF belongs to Linear's micropower synchronous boost converter family, engineered for ultra-low-input-voltage, high-efficiency power conversion in space-constrained portable electronics where battery life and EMI performance are critical.
FAQ
What is the minimum input voltage required for the LTC3402EMS#PBF to start up?
The LTC3402EMS#PBF has a typical start-up voltage of 0.85V, enabling reliable operation from deeply discharged single-cell batteries. Once started and VOUT exceeds ~2.3V, the IC self-biases from VOUT, allowing continued operation even if VIN drops below 0.5V - provided sufficient energy remains in the source. This behavior is confirmed in the Electrical Characteristics table and Figure 3402 G17.
Does the LTC3402EMS#PBF require an external Schottky diode?
The LTC3402EMS#PBF does not require an external Schottky diode for output voltages below 4.3V, thanks to its integrated synchronous P-channel rectifier. For VOUT > 4.3V, a Schottky diode (e.g., MBR0520L) is mandatory to clamp the SW pin voltage within its –0.5V to 6V absolute maximum rating, as specified in the Absolute Maximum Ratings table and Application Note section "Output Diode".
How is switching frequency programmed on the LTC3402EMS#PBF?
Switching frequency on the LTC3402EMS#PBF is set by an external resistor (Rt) connected between Pin 1 (Rt) and ground, following fOSC = 3×10¹⁰/Rt Hz. For example, a 30.1kΩ resistor yields ~1MHz. The oscillator can also be synchronized to an external clock applied to the MODE/SYNC pin, provided the free-running frequency is ~30% lower than the sync frequency, per the Functional Description section.
What is the purpose of the antiringing control feature in the LTC3402EMS#PBF?
The antiringing control in the LTC3402EMS#PBF actively damps high-frequency ringing on the SW pin during discontinuous conduction mode by placing a controlled impedance across the inductor-SW node capacitance. This reduces EMI radiation without external snubbers, as demonstrated in Figure 3402 G01 and described in the Detailed Description section under "Antiringing Control".
Can the LTC3402EMS#PBF be used in applications requiring output disconnect during shutdown?
By default, the LTC3402EMS#PBF does not provide true output disconnect in shutdown due to the body diode of the internal P-channel MOSFET, which allows reverse current flow from VOUT to VIN. However, the datasheet provides two validated external circuits (Figures 3402 TA03 and TA04) using discrete transistors (e.g., FMMT717 or IRLML6401) to achieve full output isolation - details are in the "Output Disconnect Circuits" section.
LTC3402EMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.5V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 2.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC3402EMS#PBF FAQ
1.How can I place an order for LTC3402EMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3402EMS#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 LTC3402EMS#PBF reliable?
The price and inventory of LTC3402EMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3402EMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC3402EMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3402EMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3402EMS#PBF?
LTC3402EMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3402EMS#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 LTC3402EMS#PBF?
For technical support, including LTC3402EMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3402EMS#PBF requirements.
6.How does Aetrix verify that LTC3402EMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3402EMS#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 LTC3402EMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC3402EMS#PBF?
All LTC3402EMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3402EMS#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 LTC3402EMS#PBF part is unused and in its original packaging.
Return procedure for LTC3402EMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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