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Analog Devices Inc. LTC3402EMS#TRPBF
- Part No.:
- LTC3402EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3402EMS#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
LTC3402EMS#TRPBF from Analog Devices (formerly Linear Technology) is a 2A, 3MHz micropower synchronous boost DC/DC converter optimized for ultra-low-input-voltage battery-powered systems. It integrates a 0.16Ω N-channel MOSFET switch and 0.18Ω P-channel synchronous rectifier, supports input voltages as low as 0.5V, delivers adjustable output from 2.6V to 5.5V, and achieves up to 97% efficiency in portable instrumentation and handheld computing.
For engineers reviewing the LTC3402EMS#TRPBF datasheet, LTC3402EMS#TRPBF pinout, LTC3402EMS#TRPBF application, or LTC3402EMS#TRPBF equivalent, key selection criteria include burst-mode quiescent current (38μA), start-up voltage (0.85V typ), 10-pin MSOP thermal performance (θJA = 100°C/W on 4-layer board), and OPTI-LOOP® compensation for stable all-ceramic capacitor designs.
Technical Context
The LTC3402EMS#TRPBF employs current-mode control with adaptive slope compensation to ensure stability across wide VIN–VOUT ratios and load transients. Its internal architecture includes lossless peak-current sensing, zero-current detection (<50mA), antiringing control for EMI reduction, and a transconductance error amplifier (85 μmhos) referenced to 1.25V FB voltage.
Switching frequency is programmable from 300kHz to 3MHz via external Rt resistor (fOSC ≈ 3×10¹⁰/Rt), and can be synchronized to an external clock on the MODE/SYNC pin. Burst Mode operation-enabled by driving MODE/SYNC high-reduces light-load quiescent current to 38μA while maintaining regulation, with PGOOD open-drain output asserting low when FB falls >9% below 1.25V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.5V to 5V - enables direct single-cell alkaline/NiMH or Li-ion startup without pre-bias |
| Output Voltage Range | 2.6V to 5.5V - adjustable via external resistor divider; 1.25V feedback reference ensures precision regulation |
| Switch Current Rating | 2A continuous - supports 1A output at 3.3V from 1.8V input with >90% efficiency |
| Burst Mode IQ | 38μA - extends battery life in standby states of GPS receivers and pagers |
| Start-Up Voltage | 0.85V typical - allows cold-start from partially discharged cells before VOUT powers IC internally |
| Switching Frequency | Up to 3MHz - permits use of sub-3μH inductors and compact ceramic output capacitors |
| Package Thermal Resistance | θJA = 100°C/W (4-layer PCB) - enables 2A operation without forced air in space-constrained handhelds |
Pinout & Package
The LTC3402EMS#TRPBF is housed in a thermally enhanced 10-lead MSOP package (3.0mm × 3.0mm × 1.1mm), with exposed pad for improved heat dissipation and solderable per manufacturer layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Rt (Pin 1) | Oscillator timing input | Connects to ground via resistor to set switching frequency (fOSC ≈ 3×10¹⁰/Rt); enables synchronization when driven by external clock |
| MODE/SYNC (Pin 2) | Burst mode control / sync input | High = Burst Mode (38μA IQ); Low = fixed-frequency operation; external clock = sync + fixed-frequency disable |
| VIN (Pin 3) | Main input supply | Accepts 0.5V–5V; powers internal circuitry until VOUT reaches ~2.3V, then IC self-powers from VOUT |
| SW (Pin 4) | Switch node | Connects to inductor and optional Schottky diode; rated –0.5V to 6V; requires short trace routing to minimize EMI |
| GND (Pin 5) | Signal and power ground | Common reference for all analog and power circuits; must be tied to exposed pad for thermal and noise integrity |
| PGOOD (Pin 6) | Open-drain power-good flag | Asserts low when FB drops >9% below 1.25V; used for system sequencing and fault monitoring |
| VOUT (Pin 7) | Regulated output / bootstrap supply | Delivers regulated output; also supplies gate drive for internal PMOS; requires ≥1μF ceramic cap placed adjacent to GND |
| FB (Pin 8) | Feedback input | Monitors output via resistor divider; 1.25V reference enables precise output adjustment; input bias <50nA minimizes divider error |
| VC (Pin 9) | Error amplifier output | Connects to OPTI-LOOP® compensation network; transconductance = 85 μmhos; enables stable loop with all-ceramic output caps |
| SHDN (Pin 10) | Shutdown control | Ground = shutdown (<1μA IQ); >1V = enable; supports hysteresis networks for sub-1V VIN operation |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.16Ω NMOS + 0.18Ω PMOS switches eliminate external Schottky need for VOUT < 4.3V, enabling >97% efficiency |
| Burst Mode operation | User-selectable via MODE/SYNC pin; reduces IQ to 38μA at light loads while maintaining regulation and low output ripple (<3%) |
| Antiringing control | Active damping circuit suppresses high-frequency ringing on SW node during discontinuous conduction, reducing EMI radiation |
| OPTI-LOOP® compensation | Transconductance error amp + adaptive slope compensation allow stable loop response with only ceramic output capacitors (no electrolytics) |
| Low-voltage start-up | 0.85V typical start threshold enables operation from nearly depleted primary cells; IC transitions to VOUT self-powering above ~2.3V |
Applications
| Handheld Computing Power Supply | GPS Receiver Core Voltage |
|---|---|
Use Scenario: Powering ARM-based microcontrollers and RF front-ends in ruggedized PDAs operating from dual AA cells (1.8–3.0V). IC Role / Device Role / Timing Role: Primary step-up regulator delivering stable 3.3V @ 1A with fast transient response to CPU burst loads. Use Value: 3MHz switching enables <2.2μH inductor and 44μF total ceramic output capacitance, minimizing board area and eliminating ESR-related ripple. | Use Scenario: Generating clean 3.3V supply for GPS baseband ICs and LNA stages in battery-powered navigation devices. IC Role / Device Role / Timing Role: High-efficiency boost converter with Burst Mode to extend runtime between satellite fixes. Use Value: 38μA quiescent current in Burst Mode preserves battery capacity during long idle periods between position updates. |
| CCFL Backlight Driver | MP3 Player Audio Codec Supply |
Use Scenario: Driving high-voltage transformer for CCFL backlight in industrial displays powered by Li-ion batteries (2.5–4.2V). IC Role / Device Role / Timing Role: Pre-regulator generating 5V intermediate rail for external flyback controller with remote dimming interface. Use Value: Synchronizable 3MHz oscillator avoids interference with IF frequencies (e.g., 455kHz, 1.1MHz) critical for display EMI compliance. | Use Scenario: Providing low-noise 3.3V supply to stereo audio DAC and headphone amplifier in flash-based MP3 players. IC Role / Device Role / Timing Role: Fixed-frequency 1MHz boost converter minimizing audible switching noise near audio band. Use Value: Antiringing control and low EMI design prevent coupling into sensitive analog audio paths, eliminating buzz in headphones. |
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#TRPBF | 1A switch rating, identical 10-pin MSOP package, same 3MHz max frequency and 0.5V min VIN | Lower output current capability limits use to ≤500mA loads; suitable where size and IQ match but power demand is reduced | Select when system load never exceeds 1A and cost optimization is prioritized over headroom |
| LTC3424EMS#TRPBF | Fixed 1.5V output (non-adjustable), same 2A switch, 3MHz capability, and 0.5V min VIN | Eliminates feedback resistors and simplifies layout; not usable where adjustable VOUT >2.6V is required | Choose for dedicated 1.5V logic rails (e.g., low-voltage FPGAs) where simplicity and BOM reduction outweigh flexibility |
Compared with LTC3401EMS#TRPBF and LTC3424EMS#TRPBF, the LTC3402EMS#TRPBF uniquely balances 2A capability, full 2.6V–5.5V adjustability, and 38μA Burst Mode IQ-making it optimal for mid-power portable systems requiring both flexibility and battery longevity.
Availability
LTC3402EMS#TRPBF is available at Aetrix Electronics and suitable for handheld computing, GPS receivers, CCFL backlighting, and MP3 player power management requiring stable component supply across production lifecycles.
Supply support for LTC3402EMS#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 maintains its legacy of high-performance analog and power management ICs for demanding industrial and portable applications.
The LTC3402EMS#TRPBF belongs to Linear's micropower synchronous boost converter product line, designed specifically for battery-powered systems needing ultra-low start-up voltage, high light-load efficiency, and minimal external components.
FAQ
What is the minimum input voltage required for the LTC3402EMS#TRPBF to start up?
The LTC3402EMS#TRPBF has a typical start-up voltage of 0.85V, allowing it to begin regulation from nearly depleted primary cells. Once VOUT reaches ~2.3V, the IC powers itself from the output rail, removing dependency on VIN. This behavior is confirmed in the Electrical Characteristics table and Start-Up Voltage vs IOUT graph (Figure G09) of the official datasheet.
Does the LTC3402EMS#TRPBF require an external Schottky diode?
The LTC3402EMS#TRPBF does not require an external Schottky diode for output voltages below 4.3V, thanks to its integrated synchronous rectifier. For VOUT > 4.3V, a Schottky diode (e.g., MBR0520L) is mandatory to prevent SW pin voltage from exceeding its 6V absolute maximum rating, as explicitly stated in the Applications Information section and Pin Functions description.
How is Burst Mode operation enabled on the LTC3402EMS#TRPBF?
Burst Mode operation on the LTC3402EMS#TRPBF is enabled by driving the MODE/SYNC pin high (≥1.4V). When active, the device enters variable-frequency operation with 38μA quiescent current and inductor current terminating at zero each cycle. The datasheet specifies this behavior in the Pin Functions section and confirms it in the Typical Performance Characteristics (Figures G05–G06).
What compensation network is recommended for the LTC3402EMS#TRPBF's VC pin?
The LTC3402EMS#TRPBF uses OPTI-LOOP® compensation, and the typical network shown in Figure F04 consists of RZ = 100kΩ, CZ = 330pF, and CC2 = 470pF. This configuration places a zero near the output filter pole and a pole near DC, ensuring stability with all-ceramic output capacitors. These values are validated in AN76 and the Compensation section of the datasheet.
Can the LTC3402EMS#TRPBF be synchronized to an external clock?
Yes, the LTC3402EMS#TRPBF can be synchronized to an external clock applied to the MODE/SYNC pin. The free-running frequency must be set ~30% lower than the target sync frequency, and the sync pulse width must remain under 2μs to disable Burst Mode. This capability is detailed in the Pin Functions and Detailed Description sections, with timing constraints verified in Figure G14 (Oscillator Frequency Accuracy).
LTC3402EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3402EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3402EMS#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 LTC3402EMS#TRPBF reliable?
The price and inventory of LTC3402EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3402EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3402EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3402EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3402EMS#TRPBF?
LTC3402EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3402EMS#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 LTC3402EMS#TRPBF?
For technical support, including LTC3402EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3402EMS#TRPBF requirements.
6.How does Aetrix verify that LTC3402EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3402EMS#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 LTC3402EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3402EMS#TRPBF?
All LTC3402EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3402EMS#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 LTC3402EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3402EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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