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Analog Devices Inc. LTC3429ES6#TRMPBF
- Part No.:
- LTC3429ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3429ES6#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:385
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Product details
Overview
LTC3429ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous boost DC/DC converter in a 6-lead TSOT-23 package, delivering up to 250mA at 3.3V from a 2-cell AA input. It features true output disconnect, 500kHz fixed-frequency operation, and low-voltage start-up down to 0.85V - enabling reliable power for battery-constrained portable electronics.
For engineers reviewing the LTC3429ES6#TRMPBF datasheet, LTC3429ES6#TRMPBF pinout, LTC3429ES6#TRMPBF application, or LTC3429ES6#TRMPBF equivalent, key selection criteria include burst-mode quiescent current (~20µA), 0.5V–4.4V input range, 2.5V–5V programmable output, internal synchronous rectification, and shutdown current <1µA.
Technical Context
The LTC3429ES6#TRMPBF uses current-mode PWM control with internal compensation and a fixed 500kHz oscillator, enabling stable regulation across wide input (0.5V–4.4V) and output (2.5V–5V) ranges. Its independent 150kHz start-up oscillator enables operation from as low as 0.85V, after which bias shifts from VIN to VOUT - sustaining regulation even as battery voltage drops to 0.5V.
Burst Mode operation (LTC3429 variant only) activates below ~1.25mA load threshold, reducing quiescent current to ~20µA while maintaining output regulation; antiringing control damps SW-pin ringing in discontinuous mode via an internal 150Ω switch, minimizing EMI without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz fixed - enables use of compact 4.7µH inductors and ceramic capacitors, minimizing solution footprint. |
| Input Voltage Range | 0.5V to 4.4V - supports single AA (1.2V), two AA (2.4V), or Li-ion (3.6V) sources without external bias. |
| Output Voltage Range | 2.5V to 5V (programmable via FB resistor divider) - covers logic rails (3.3V), LCD bias (5V), and analog subsystems. |
| Peak Switch Current Limit | 600mA typical - sets maximum deliverable output current (e.g., 250mA @ 3.3V from 2-cell AA). |
| Quiescent Current (Burst Mode) | 20µA typical - extends battery life in standby by disabling non-essential circuitry while monitoring output. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep or off-state, critical for long shelf life. |
| Start-Up Voltage | 0.85V minimum - allows cold-start from deeply discharged alkaline or NiMH cells. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant - optimized for space-constrained portable PCBs with minimal thermal resistance (θJC = 102°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; internal NMOS switch and antiringing 150Ω path to VIN minimize EMI during zero-current transitions. |
| GND (Pin 2) | Signal and power ground | Primary return path for inductor current and feedback network; requires low-impedance PCB connection to output capacitor negative terminal. |
| FB (Pin 3) | Feedback input | Senses output voltage via resistor divider; internal 1.23V reference enables precise output programming (VOUT = 1.23V × [1 + R1/R2]). |
| SHDN (Pin 4) | Logic shutdown control | Active-high input; pulls internal switches off when low, discharging VOUT through load/feedback resistors and reducing IQ to <1µA. |
| VOUT (Pin 5) | Output sense & synchronous rectifier drain | Provides bias for internal circuitry once started; true disconnect isolates output from input during shutdown - no body-diode leakage. |
| VIN (Pin 6) | Battery input | Supplies start-up bias; after startup, IC derives power from VOUT - enabling operation even if VIN drops to 0.5V. |
Key Features
| Feature | Design Value |
|---|---|
| True output load disconnect | Eliminates body-diode conduction path - VOUT fully discharges to 0V in shutdown, preventing backfeed and enabling clean system power sequencing. |
| Inrush current limiting & soft-start | Internal weak-current charging of soft-start capacitor limits peak inductor current ramp to 850mA over ~2.5ms, suppressing input surge during startup. |
| Low-voltage start-up (0.85V) | Dedicated 150kHz open-loop start-up oscillator enables reliable cold-start from near-dead batteries - critical for consumer handhelds. |
| Antiringing control | Internal 150Ω switch between SW and VIN damps LC resonance at zero-current crossing - reduces EMI without snubbers or layout compromises. |
| Internal synchronous rectification | Integrated PMOS rectifier replaces external Schottky diode - improves efficiency by ~5% and eliminates forward-drop losses at light loads. |
Applications
| MP3 Players | Digital Cameras |
|---|---|
Use Scenario: Powering audio DAC, flash memory, and display backlight from dual AA cells. IC Role / Device Role / Timing Role: Synchronous boost converter generating stable 3.3V rail with burst-mode efficiency during playback pause. Use Value: 96% peak efficiency and 20µA burst-mode IQ extend battery runtime beyond 20 hours per charge cycle. | Use Scenario: Supplying image sensor bias (5V) and processor core (3.3V) from single Li-ion cell. IC Role / Device Role / Timing Role: Programmable-output boost regulator delivering 5V for CCD bias while maintaining true disconnect during camera sleep. Use Value: Output disconnect prevents sensor leakage current from draining battery during standby - preserving >99% charge over 72-hour idle period. |
| LCD Bias Supplies | Handheld Instruments |
Use Scenario: Generating high-side gate drive (5V) and VCOM (−5V via charge pump) for monochrome STN LCDs. IC Role / Device Role / Timing Role: Primary positive rail generator with tight line/load regulation (<±1%) and fast transient response to backlight dimming steps. Use Value: 500kHz switching and internal compensation enable <10µs recovery from 50mA load steps - eliminating visible screen flicker. | Use Scenario: Powering precision ADC, op-amp front-end, and microcontroller from 2xAA in multimeter or data logger. IC Role / Device Role / Timing Role: Low-noise, low-quiescent boost converter supplying regulated 3.3V with <10mVpp ripple under dynamic load. Use Value: Antiringing control and ceramic-capacitor compatibility reduce conducted EMI below CISPR-22 Class B limits - avoiding EMC rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3400ES6#TRMPBF | 1.2MHz switching, 600mA ISW, no output disconnect, higher IQ (19µA active) | Lacks true output disconnect and burst-mode - unsuitable where VOUT must fully discharge in shutdown. | Select when higher frequency allows smaller inductors and output disconnect is not required. |
| LTC3421EFE#TRPBF | 3A ISW, 3MHz, QFN24, output disconnect, 12µA burst IQ, wider VIN (0.5V–4.5V) | Higher current, larger package, more complex layout - over-specified for sub-300mA portable apps. | Select when >500mA output or enhanced thermal performance is needed; not drop-in due to pinout and footprint mismatch. |
Compared with LTC3400ES6#TRMPBF, LTC3429ES6#TRMPBF provides essential output disconnect and lower burst-mode IQ for ultra-low-power sleep states; compared with LTC3421EFE#TRPBF, it offers identical functionality in a cost-optimized 6-pin TSOT-23 footprint ideal for space-constrained consumer devices.
Availability
LTC3429ES6#TRMPBF is available at Aetrix Electronics and suitable for MP3 players, digital cameras, and handheld instruments requiring stable component supply, long battery life, and true output disconnect capability.
Supply support for LTC3429ES6#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) designs high-performance analog, mixed-signal, and power management ICs for precision, reliability, and energy efficiency across industrial, automotive, and consumer markets.
The LTC3429 product line targets ultra-low-power portable electronics, delivering micropower synchronous boost conversion with integrated features like output disconnect, soft-start, and antiringing control - all in miniature TSOT-23 packaging.
FAQ
What is the minimum input voltage required to start up the LTC3429ES6#TRMPBF?
The LTC3429ES6#TRMPBF features a dedicated start-up oscillator that enables reliable cold-start at 0.85V (typical), allowing operation from nearly depleted alkaline or NiMH cells. Once started, the device sustains regulation down to 0.5V input due to VOUT-derived bias - a key advantage for battery-powered systems where voltage sag is common.
Does the LTC3429ES6#TRMPBF support true output disconnect, and how does it work?
Yes, the LTC3429ES6#TRMPBF provides true output disconnect via elimination of the PMOS body-diode conduction path during shutdown. When SHDN is pulled low, the internal synchronous rectifier is fully disabled, isolating VOUT from VIN and allowing the output capacitor to discharge completely through the load or feedback resistors - critical for clean power sequencing and zero standby current.
How does Burst Mode operation improve efficiency in the LTC3429ES6#TRMPBF?
Burst Mode operation in the LTC3429ES6#TRMPBF reduces quiescent current to ~20µA by cycling the converter on/off only as needed to maintain output regulation. When load current falls below ~1.25mA, the IC enters sleep state, waking briefly to recharge VOUT when droop exceeds ~1%. This minimizes switching and bias losses - extending battery life in intermittent-use devices like remote controls or sensors.
Can the LTC3429ES6#TRMPBF generate output voltages above 4.3V, and what is required?
Yes, the LTC3429ES6#TRMPBF can program outputs up to 5V using the FB resistor divider. However, for VOUT > 4.3V, a Schottky diode (e.g., MBR0520L) must be added from SW to VOUT to clamp peak switch voltage below 6V. Note: this diode disables true output disconnect - for applications requiring both high VOUT and disconnect, an active snubber network is recommended instead.
What is the purpose of the antiringing control feature in the LTC3429ES6#TRMPBF?
The antiringing control in the LTC3429ES6#TRMPBF minimizes EMI by damping high-frequency ringing at the SW pin during discontinuous conduction mode. An internal 150Ω switch connects SW to VIN when inductor current reaches zero, dissipating resonant energy in the L–CSW tank - eliminating the need for external snubbers and simplifying layout while meeting CISPR-22 radiated emissions requirements.
LTC3429ES6#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
LTC3429ES6#TRMPBF FAQ
1.How can I place an order for LTC3429ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3429ES6#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 LTC3429ES6#TRMPBF reliable?
The price and inventory of LTC3429ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3429ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3429ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3429ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3429ES6#TRMPBF?
LTC3429ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3429ES6#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 LTC3429ES6#TRMPBF?
For technical support, including LTC3429ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3429ES6#TRMPBF requirements.
6.How does Aetrix verify that LTC3429ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3429ES6#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 LTC3429ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3429ES6#TRMPBF?
All LTC3429ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3429ES6#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 LTC3429ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3429ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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