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Analog Devices Inc. LTC3429BES6#TRMPBF
- Part No.:
- LTC3429BES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3429BES6#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:604
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Product details
Overview
LTC3429BES6#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous boost DC/DC converter with true output disconnect, fixed 500kHz switching frequency, and continuous light-load operation. It delivers up to 250mA at 3.3V from a 2-cell AA input (2.4V–3.0V), achieves up to 96% efficiency, supports 0.85V start-up, and operates across 0.5V–4.4V input and 2.5V–4.3V output ranges. It targets space-constrained portable power rails in MP3 players and handheld instruments.
For engineers reviewing the LTC3429BES6#TRMPBF datasheet, LTC3429BES6#TRMPBF pinout, LTC3429BES6#TRMPBF application, or LTC3429BES6#TRMPBF equivalent, key selection criteria include its continuous-mode light-load behavior (vs. Burst Mode in LTC3429), 6-pin TSOT-23 package constraints, output disconnect capability, inrush limiting, and compatibility with low-profile 4.7µH inductors and ceramic capacitors.
Technical Context
The LTC3429BES6#TRMPBF uses current-mode PWM control with internal compensation and a fixed 500kHz oscillator, enabling stable regulation with minimal external components. Its dual-MOSFET synchronous rectifier (0.35Ω NMOS / 0.45Ω PMOS) and antiringing circuitry suppress EMI during discontinuous conduction mode.
Unlike the LTC3429, the LTC3429B variant maintains continuous switching down to zero load-eliminating Burst Mode ripple-while retaining identical start-up (0.85V), shutdown (<1µA), soft-start (2.5ms), and protection features including short-circuit foldback and thermal shutdown at 160°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 500kHz - enables use of compact 4.7µH inductors and ceramic output caps without external compensation. |
| Input Voltage Range | 0.5V to 4.4V - supports single-AA (0.85V start-up) and 2-cell alkaline/Li-ion inputs without external bias. |
| Output Voltage Range | 2.5V to 4.3V (adjustable via FB divider) - covers standard logic and analog rails; >4.3V requires external Schottky diode. |
| Peak Switch Current Limit | 600mA typical - sets maximum deliverable output current under low-VIN conditions (e.g., 250mA @ 3.3V from 2-cell AA). |
| Quiescent Current (Active) | 380µA typical - measured on VOUT; enables high light-load efficiency without Burst Mode interruption. |
| Shutdown Current | <1µA - ensures battery drain is negligible during system sleep; output fully disconnects to 0V. |
| Feedback Reference Voltage | 1.230V ±38mV - defines output setpoint accuracy; used with R1/R2 divider to program VOUT = 1.23V × (1 + R1/R2). |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant. Dimensions: 2.90mm × 1.60mm × 0.85mm max height. Requires tight layout for SW/GND/VOUT traces to minimize EMI and voltage overshoot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; internally drives NMOS switch; antiringing resistor (150Ω) connects SW to VIN when current falls to zero. |
| GND (Pin 2) | Signal and power ground | Reference for all internal circuits; must tie directly to (–) side of output capacitor with low-inductance path. |
| FB (Pin 3) | Feedback input | Senses resistive divider output; regulates VOUT by comparing to 1.23V reference; input bias current ≤50nA. |
| SHDN (Pin 4) | Logic shutdown control | High = normal operation; Low = <1µA shutdown with full output disconnect; threshold: VIH ≥1V, VIL ≤0.35V. |
| VOUT (Pin 5) | Output voltage sense & sync rectifier drain | Bias source after startup; gate drive for internal PMOS rectifier; fully disconnected from VIN during SHDN. |
| VIN (Pin 6) | Battery input | Start-up bias source; supplies internal circuitry until VOUT > VIN; supports operation down to 0.5V post-startup. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous light-load operation | LTC3429B variant avoids Burst Mode ripple by sustaining 500kHz switching even at zero load-critical for noise-sensitive analog rails. |
| True output disconnect | Internal PMOS gate control eliminates body diode conduction; VOUT discharges fully to 0V during shutdown-enables precise power sequencing. |
| Inrush current limiting & soft-start | Internal capacitor ramp limits peak inductor current to 850mA over ~2.5ms; prevents input surge and output overshoot at startup. |
| Low-voltage start-up | Independent 150kHz start-up oscillator enables reliable boot from 0.85V (e.g., deeply discharged AA cell) before transitioning to closed-loop PWM. |
| Antiringing control | 150Ω internal switch damps SW-node resonance at zero-current crossing-reduces EMI without external snubbers. |
Applications
| MP3 Players | Digital Cameras |
|---|---|
Use Scenario: Powering 3.3V audio DAC and flash memory from two AA cells with standby intervals. IC Role / Device Role / Timing Role: Primary boost regulator supplying regulated 3.3V rail; manages battery discharge curve down to 0.5V while maintaining regulation. Use Value: Continuous switching (LTC3429B) avoids audible Burst Mode ripple in audio paths; 96% efficiency extends playback time per battery charge. |
Use Scenario: Generating 3.3V for image sensor interface and 5V for LCD backlight driver from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-rail support via adjustable feedback; enables 5V output with external Schottky diode while preserving inrush limiting. Use Value: True output disconnect isolates LCD circuitry during sleep-preventing leakage through backlight driver; soft-start prevents flash-trigger timing jitter. |
| Handheld Instruments | GPS Receivers |
Use Scenario: Providing stable 3.3V supply to precision ADC and RF front-end in battery-powered multimeter. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency boost converter with minimal output ripple; GND pin routing minimizes measurement offset drift. Use Value: 500kHz operation allows small 4.7µH inductor and 4.7µF ceramic cap-reducing board area in compact enclosures without compromising PSRR. |
Use Scenario: Biasing GPS RF LNA and baseband processor from 2.4V–3.6V Li-ion input with cold-start requirement. IC Role / Device Role / Timing Role: Cold-start capable regulator delivering 3.3V at 50mA; operates reliably at –40°C with guaranteed specs over full industrial range. Use Value: 0.85V start-up enables GPS lock under weak battery conditions; thermal shutdown (160°C) protects against enclosure overheating during extended acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3429ES6#TRMPBF | Burst Mode operation below ~1.25mA load; 20µA quiescent current in sleep vs. 380µA active in LTC3429B; identical pinout and package. | Preferred where ultra-low standby current dominates over output ripple; unsuitable for noise-sensitive analog loads. | Select LTC3429ES6#TRMPBF only if system spends >90% time in deep sleep and can tolerate ~2% P-P output ripple. |
| LTC3400BES6#TRMPBF | 1.2MHz switching (vs. 500kHz); higher IQ (300µA active); same 0.85V start-up but lower 600mA current limit; no antiringing control. | Better suited for ultra-compact layouts needing smaller inductors; less effective EMI suppression in discontinuous mode. | Choose LTC3400BES6#TRMPBF when board space is more constrained than EMI compliance requirements-and 1.2MHz noise falls outside sensitive bands. |
Compared with LTC3429ES6#TRMPBF, the LTC3429BES6#TRMPBF trades lower light-load IQ for ripple-free regulation, while versus LTC3400BES6#TRMPBF it prioritizes EMI control and thermal robustness over raw size reduction-making it optimal for mixed-signal portable systems demanding clean, predictable power.
Availability
LTC3429BES6#TRMPBF is available at Aetrix Electronics and suitable for MP3 players, digital cameras, and handheld instruments requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 85°C.
Supply support for LTC3429BES6#TRMPBF 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 power management ICs with rigorous automotive and industrial qualification.
The LTC3429BES6#TRMPBF belongs to Linear's micropower synchronous boost converter family, designed specifically for battery-powered portable electronics needing high efficiency at ultralow input voltages and seamless integration in space-limited TSOT-23 layouts.
FAQ
What distinguishes LTC3429BES6#TRMPBF from LTC3429ES6#TRMPBF?
The LTC3429BES6#TRMPBF maintains continuous 500kHz switching under all load conditions, eliminating Burst Mode output ripple present in the LTC3429ES6#TRMPBF. While both share identical pinout, package, start-up voltage (0.85V), and shutdown current (<1µA), the LTC3429BES6#TRMPBF draws 380µA quiescent current in active mode versus 20µA in LTC3429ES6#TRMPBF's Burst Mode sleep state-making it preferable for noise-sensitive analog rails.
Can LTC3429BES6#TRMPBF generate 5V output?
Yes, the LTC3429BES6#TRMPBF can regulate up to 5V output, but only with an external Schottky diode connected from SW to VOUT. Without it, the absolute maximum output is 4.3V due to internal voltage limits. Adding the diode (e.g., MBR0520L) clamps SW pin voltage to <6V but disables true output disconnect-so VOUT will not fully discharge to 0V during shutdown.
What is the minimum input voltage required for sustained operation of LTC3429BES6#TRMPBF?
After successful start-up (which occurs at ≥0.85V), the LTC3429BES6#TRMPBF sustains regulation down to 0.5V input-enabled by its ability to self-bias from VOUT once started. This allows full utilization of alkaline AA cells until near depletion, though practical output current diminishes as VIN drops below 1.0V due to reduced duty cycle headroom.
How does the output disconnect feature work in LTC3429BES6#TRMPBF?
The LTC3429BES6#TRMPBF achieves true output disconnect by actively controlling the gate of its internal PMOS synchronous rectifier to prevent body diode conduction. When SHDN is pulled low, the PMOS is fully turned off and VOUT is isolated from VIN-allowing the output capacitor to discharge completely through the load or feedback resistors, drawing zero current from the input source.
Which inductor value is recommended for LTC3429BES6#TRMPBF in a 3.3V@250mA, 2-cell AA application?
A 4.7µH inductor is recommended for the LTC3429BES6#TRMPBF in 3.3V/250mA applications from 2-cell AA (2.4V–3.0V). This value balances size, efficiency (~96%), and transient response. Recommended parts include Coilcraft D0160C-472 or Sumida CDRH5D18-4R1-both rated for ≥850mA peak current and low DCR (<60mΩ) to minimize I²R losses.
LTC3429BES6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 4.4V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 4.3V
- Current - Output:
- 600mA (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3429BES6#TRMPBF FAQ
1.How can I place an order for LTC3429BES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3429BES6#TRMPBF 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 LTC3429BES6#TRMPBF reliable?
The price and inventory of LTC3429BES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3429BES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3429BES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3429BES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3429BES6#TRMPBF?
LTC3429BES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3429BES6#TRMPBF 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 LTC3429BES6#TRMPBF?
For technical support, including LTC3429BES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3429BES6#TRMPBF requirements.
6.How does Aetrix verify that LTC3429BES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3429BES6#TRMPBF 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 LTC3429BES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3429BES6#TRMPBF?
All LTC3429BES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3429BES6#TRMPBF, 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 LTC3429BES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3429BES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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