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Analog Devices Inc. LTC3429ES6#TRPBF
- Part No.:
- LTC3429ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3429ES6#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,237
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Product details
Overview
LTC3429ES6#TRPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous boost DC/DC converter with true output disconnect, designed for low-voltage battery-powered systems. It delivers up to 250mA at 3.3V from a 2-cell AA input, operates down to 0.85V start-up voltage, achieves up to 96% efficiency, and switches at a fixed 500kHz frequency in a 6-lead TSOT-23 package.
For engineers reviewing the LTC3429ES6#TRPBF datasheet, LTC3429ES6#TRPBF pinout, LTC3429ES6#TRPBF application, or LTC3429ES6#TRPBF equivalent, key selection criteria include its 600mA current limit, 20µA Burst Mode quiescent current, 1.23V feedback reference, shutdown current <1µA, and compatibility with single- or dual-cell alkaline/Li-ion sources in space-constrained portable power rails.
Technical Context
The LTC3429ES6#TRPBF employs current-mode PWM control with internal compensation and a dedicated 150kHz start-up oscillator enabling operation below 1V. Its architecture integrates NMOS/PMOS synchronous rectifiers with antiringing control, zero-current detection, and inrush-limiting soft-start (2.5ms typical).
It supports VIN-to-VOUT regulation across 0.5V–4.4V input and 2.5V–4.3V output (up to 5V with external Schottky), features true output disconnect during shutdown, and automatically enters Burst Mode below ~1.25mA load to sustain ~20µA IQ - distinguishing it from the continuous-mode LTC3429B variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 500kHz - enables use of compact 4.7µH inductors and ceramic capacitors, minimizing solution footprint. |
| Start-Up Voltage | 0.85V min - allows reliable boot from deeply discharged single AA or NiMH cells. |
| Output Disconnect | True load isolation in shutdown - VOUT fully discharges, eliminating standby leakage through feedback resistors or loads. |
| Burst Mode IQ | 20µA typical - extends battery life in intermittent-use devices like GPS receivers and handheld instruments. |
| Feedback Reference | 1.230V ±3.4% - sets output voltage via external resistor divider (VOUT = 1.23V × [1 + R1/R2]). |
| Current Limit | 600mA typical - defines maximum peak switch current, limiting inductor stress and thermal rise under overload. |
| Shutdown Current | <1µA - ensures negligible battery drain during system sleep or storage. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant, 3.85mm × 2.90mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; internal NMOS switch source; antiringing resistor engages when current falls to zero. |
| GND (Pin 2) | Power and signal ground | Primary return path for inductor current and IC bias; requires low-inductance PCB connection to output capacitor negative terminal. |
| FB (Pin 3) | Feedback input | Senses resistor divider voltage; regulates output by comparing to 1.23V internal reference; input current <50nA minimizes divider error. |
| SHDN (Pin 4) | Logic shutdown control | Active-high enable; pulls internal 150Ω SW-to-VIN path when low, ensuring full output disconnect and <1µA supply current. |
| VOUT (Pin 5) | Output sense / rectifier drain | Provides bias for internal circuitry once VOUT > VIN; disconnects from SW during shutdown via PMOS gate control. |
| VIN (Pin 6) | Battery input | Supplies start-up bias; after startup, IC derives power from VOUT - enabling operation even as VIN drops to 0.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage start-up | Operates from 0.85V input - supports single-cell alkaline/NiMH and Li-ion applications without external bias rails. |
| True output disconnect | Eliminates body-diode conduction path - prevents backfeed and enables complete VOUT discharge during shutdown. |
| Antiringing control | Internal 150Ω SW-to-VIN switch damps LC ringing at light loads - reduces EMI without external snubbers. |
| Inrush current limiting | Soft-start ramps peak inductor current over ~2.5ms - limits surge into output capacitance during power-on. |
| Internal synchronous rectification | NMOS/PMOS switches replace external diodes - eliminates 0.3–0.5V forward drop, sustaining high efficiency at low output voltages. |
Applications
| MP3 Players | Digital Cameras |
|---|---|
Use Scenario: Powering 3.3V audio DACs and flash memory from two AA cells in portable music players. IC Role / Device Role / Timing Role: Synchronous boost regulator providing regulated 3.3V rail with true shutdown isolation between playback sessions. Use Value: 96% peak efficiency and 20µA Burst Mode IQ extend playback time; output disconnect prevents battery drain during pause/standby. | Use Scenario: Supplying 3.3V logic and 5V LCD bias from a single Li-ion cell in compact digital cameras. IC Role / Device Role / Timing Role: Dual-rail generator using one converter for core logic (3.3V) and external Schottky-assisted 5V LCD supply. Use Value: 0.85V start-up enables operation until battery reaches 2.7V; antiringing control meets EMI limits for image sensor timing circuits. |
| Handheld Instruments | GPS Receivers |
Use Scenario: Generating stable 3.3V for microcontroller, ADC, and RF front-end in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Primary system power converter with precise 1.23V reference enabling accurate voltage scaling for analog measurement paths. Use Value: 0.5V minimum operating voltage sustains function during deep discharge; <1µA shutdown current preserves battery for months in storage. | Use Scenario: Delivering 3.3V to GPS baseband IC and LNA from two AA cells in asset trackers and wearable navigation devices. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency boost stage powering sensitive RF sections with minimal switching interference. Use Value: 500kHz switching avoids critical GPS IF bands; Burst Mode maintains µA-level sleep current during satellite acquisition gaps. |
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#TRPBF | 1.2MHz switching, 600mA limit, 19µA Burst Mode IQ, same 6-lead TSOT-23 package. | Higher frequency enables smaller inductors but increases switching loss above 100mA; no antiringing control. | Select for ultra-compact layouts where 1.2MHz permits sub-2.2µH inductors; avoid if EMI-sensitive RF sections share PCB. |
| LTC3425EDD#TRPBF | 4-phase, 5A capability, 8MHz, QFN32 package, 12µA IQ, supports 0.5V–4.5V input. | Designed for high-current, multi-rail systems (e.g., FPGA I/O banks); not pin-compatible; requires complex layout and thermal management. | Select only for >1A output requirements; incompatible with TSOT-23 footprints or simple 2-layer boards. |
Compared with LTC3400ES6#TRPBF and LTC3425EDD#TRPBF, the LTC3429ES6#TRPBF offers optimal balance of ultra-low start-up voltage (0.85V), integrated antiringing, and proven 250mA/3.3V performance in minimal TSOT-23 area - making it preferred for cost-sensitive, battery-limited portable instrumentation.
Availability
LTC3429ES6#TRPBF is available at Aetrix Electronics and suitable for MP3 players, digital cameras, and handheld instruments requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3429ES6#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3429 product line targets ultra-low-power, wide-input-range DC/DC conversion for portable and battery-critical applications - emphasizing start-up reliability, efficiency across load range, and minimal external component count.
FAQ
What is the minimum input voltage required to start up the LTC3429ES6#TRPBF?
The LTC3429ES6#TRPBF features a dedicated start-up oscillator enabling operation from as low as 0.85V (typical) with 1mA load and 0V output. This allows reliable boot from nearly depleted single AA or NiMH cells. Once started, the device can continue operating down to 0.5V input due to VOUT-derived biasing - confirmed in Electrical Characteristics Table (Note 3).
Does the LTC3429ES6#TRPBF support true output disconnect, and how does it work?
Yes, the LTC3429ES6#TRPBF provides true output disconnect: when SHDN is pulled low, the internal PMOS synchronous rectifier gate is actively controlled to eliminate body-diode conduction. This fully isolates VOUT from VIN, allowing the output to discharge completely through the load or feedback network - verified in Applications Information section and Pin Functions (Pin 4 & 5 descriptions).
How does Burst Mode operation improve efficiency in the LTC3429ES6#TRPBF?
Burst Mode reduces quiescent current to ~20µA by cycling the LTC3429ES6#TRPBF between active PWM bursts and deep sleep states when load current falls below ~1.25mA. During sleep, only the feedback comparator remains active - minimizing switching and bias losses. This extends battery life in standby-heavy devices like GPS receivers, as documented in Typical Performance Characteristics (Figure G04–G07).
Can the LTC3429ES6#TRPBF generate 5V output, and what design considerations apply?
Yes, the LTC3429ES6#TRPBF can regulate up to 5V output using an external Schottky diode from SW to VOUT (per Applications Information, Figure TA04). However, this bypasses the true output disconnect feature. For applications requiring both 5V and disconnect, an active snubber network is recommended - detailed in the "Applications Where VOUT > 4.3V" section.
What is the purpose of the antiringing control in the LTC3429ES6#TRPBF?
The antiringing control in the LTC3429ES6#TRPBF engages a 150Ω internal resistor between SW and VIN when inductor current reaches zero - damping the LC resonance formed by stray inductance and SW-node capacitance. This suppresses high-frequency ringing, reducing conducted and radiated EMI without external components, as shown in Figures G13–G14 and described in the Antiringing Control subsection.
LTC3429ES6#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC3429ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3429ES6#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 LTC3429ES6#TRPBF reliable?
The price and inventory of LTC3429ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3429ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3429ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3429ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3429ES6#TRPBF?
LTC3429ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3429ES6#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 LTC3429ES6#TRPBF?
For technical support, including LTC3429ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3429ES6#TRPBF requirements.
6.How does Aetrix verify that LTC3429ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3429ES6#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 LTC3429ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3429ES6#TRPBF?
All LTC3429ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3429ES6#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 LTC3429ES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC3429ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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