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Analog Devices Inc. LTC3429BES6#TRPBF
- Part No.:
- LTC3429BES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3429BES6#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,241
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Product details
Overview
LTC3429BES6#TRPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous boost DC/DC converter in a 6-lead TSOT-23 package, delivering up to 600mA output current at 500kHz fixed switching frequency with true output disconnect, continuous light-load operation, and 0.85V minimum start-up voltage. It supports 2.5V–4.3V regulated output from 0.5V–4.4V input and is used in battery-powered portable electronics requiring low quiescent current and high efficiency across wide load ranges.
For engineers reviewing the LTC3429BES6#TRPBF datasheet, LTC3429BES6#TRPBF pinout, LTC3429BES6#TRPBF application, or LTC3429BES6#TRPBF equivalent, key selection criteria include its continuous-mode light-load behavior (vs. Burst Mode in LTC3429), 20µA quiescent current in active mode, internal synchronous rectification, and compatibility with single- or dual-cell alkaline/Li-ion sources in space-constrained handheld instruments and GPS receivers.
Technical Context
The LTC3429BES6#TRPBF implements current-mode PWM control with internal compensation and a fixed 500kHz oscillator, enabling stable regulation with minimal external components. Its architecture integrates NMOS/PMOS synchronous switches (0.35Ω/0.45Ω RDS(ON)), zero-current detection for light-load efficiency, and antiringing control to suppress SW-pin ringing during discontinuous conduction.
Unlike the LTC3429 variant, the LTC3429B maintains continuous switching down to zero load-eliminating Burst Mode ripple-while retaining identical start-up, shutdown, soft-start, and output disconnect functionality. Input voltage range (0.5V–4.4V), feedback reference (1.23V ±3.4%), and thermal protection (125°C regulation, 160°C shutdown) are shared across both variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz fixed - enables use of compact 4.7µH inductors and ceramic capacitors without compromising transient response. |
| Input Voltage Range | 0.5V to 4.4V - supports deep-discharge single AA (0.5V) and dual AA (up to 3.2V) or Li-ion (up to 4.2V) without external bias. |
| Output Voltage Range | 2.5V to 4.3V (up to 5V with Schottky) - programmable via resistor divider; 1.23V feedback reference ensures ±3% regulation accuracy over temperature. |
| Max Output Current | 600mA - limited by internal 850mA peak switch current and thermal design; delivers 250mA @ 3.3V from 2-cell AA with >90% efficiency. |
| Quiescent Current | 380µA active, <1µA shutdown - enables multi-year battery life in always-on sensor nodes and GPS receivers with infrequent wake-ups. |
| Start-Up Voltage | 0.85V typical - allows reliable boot from nearly depleted alkaline cells; uses dedicated 150kHz open-loop start-up oscillator until VOUT exceeds 2.3V. |
| Output Disconnect | True - PMOS rectifier fully isolates VOUT from VIN during shutdown, discharging output through load/feedback network and eliminating reverse leakage paths. |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm height, JEDEC MO-193 compliant, footprint compatible with standard SOT-23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt current; internal 150Ω antiringing switch ties SW to VIN when inductor current reaches zero. |
| GND (Pin 2) | Power and signal ground | Primary return path for input/output currents; must be tied directly to low-impedance ground plane near output capacitor negative terminal. |
| FB (Pin 3) | Feedback input | Senses resistor divider output; regulates VOUT = 1.23V × (1 + R1/R2); input bias current ≤50nA minimizes divider error. |
| SHDN (Pin 4) | Logic shutdown control | Active-high; drives internal sleep state when low (<0.35V), reducing IQ to <1µA and enabling full output discharge. |
| VOUT (Pin 5) | Output voltage sense & sync rectifier drain | Bias source for internal circuitry once VOUT > VIN; disconnects from VIN during shutdown; requires short, wide PCB trace to output capacitor. |
| VIN (Pin 6) | Battery input | Supplies start-up bias; after startup, IC derives power from VOUT - allowing operation even as VIN drops to 0.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous light-load operation | LTC3429B variant avoids Burst Mode ripple by maintaining fixed-frequency switching down to zero load - critical for noise-sensitive RF and audio circuits. |
| True output disconnect | Eliminates body-diode conduction path between VIN and VOUT during shutdown - prevents backfeed, enables complete output discharge, and supports inrush limiting. |
| Low-voltage start-up | 0.85V minimum start-up voltage with dedicated oscillator allows reliable boot from exhausted primary cells without external charge pumps or boost assist. |
| Internal synchronous rectification | Integrated NMOS/PMOS switches (0.35Ω/0.45Ω) replace external Schottky diodes - improving efficiency by 5–10% and reducing solution size and BOM count. |
| Antiringing control | 150Ω internal switch damps SW-node resonance at light loads - reduces EMI emissions by >15dB and eliminates need for snubber networks in most applications. |
Applications
| GPS Receivers | Digital Cameras |
|---|---|
Use Scenario: Portable GPS modules powered by two AA batteries requiring stable 3.3V rail for RF front-end and baseband processor during intermittent satellite acquisition. IC Role / Device Role / Timing Role: Primary 3.3V power supply with true output disconnect to prevent battery drain during sleep mode and support fast wake-up without voltage sag. Use Value: 96% peak efficiency at 100mA and <1µA shutdown current extend battery life to >100 hours per set; continuous switching avoids Burst Mode-induced RF interference. | Use Scenario: Compact digital camera LCD bias supply where space constraints prohibit discrete inductor-diode solutions and EMI must be minimized near image sensor. IC Role / Device Role / Timing Role: Synchronous boost converter generating 5V from 2.4–3.0V battery input to drive LCD backlight and analog front-end circuitry. Use Value: Internal antiringing control reduces conducted EMI by >15dB vs. non-synchronous alternatives; 4.7µH inductor fits within 3×3mm footprint. |
| Handheld Instruments | MP3 Players |
Use Scenario: Battery-powered multimeter or oscilloscope probe with isolated analog front-end requiring clean, low-noise 5V supply derived from single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency step-up regulator providing regulated 5V output with minimal output ripple and no Burst Mode artifacts affecting measurement accuracy. Use Value: Continuous switching (LTC3429B) ensures <10mVpp output ripple at all loads - critical for 16-bit ADC reference stability and low-noise op-amp biasing. | Use Scenario: Portable MP3 player using dual AA cells to power 3.3V audio DAC, flash memory, and display controller during playback and standby. IC Role / Device Role / Timing Role: Main system power supply with soft-start and inrush limiting to prevent brownout during cold start and maintain stable voltage during headphone amplifier transients. Use Value: 2.5ms internal soft-start limits inrush current to <150mA - protecting weak alkaline cells and preventing audible pop 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 |
|---|---|---|---|
| LTC3429ES6#TRPBF | Burst Mode operation at light loads (IQ ~20µA), not continuous switching; otherwise identical pinout, specs, and package. | Preferred where ultra-low standby current outweighs ripple sensitivity - e.g., infrequently polled IoT sensors. | Select LTC3429BES6#TRPBF when continuous switching is required to avoid Burst Mode ripple; choose LTC3429ES6#TRPBF only if sub-30µA average IQ justifies added noise. |
| LTC3400BES6#TRPBF | 1.2MHz switching frequency, lower max output current (600mA), higher quiescent current (300µA active), same 0.85V start-up and output disconnect. | Better suited for ultra-compact designs needing smaller inductors (2.2µH typical), but less efficient below 100mA due to higher switching losses. | LTC3429BES6#TRPBF offers superior light-load efficiency and lower IQ than LTC3400BES6#TRPBF - choose for battery longevity in handheld instruments and GPS. |
Compared with LTC3429ES6#TRPBF, the LTC3429BES6#TRPBF trades ~10µA higher active IQ for zero-Burst ripple and seamless load transitions; versus LTC3400BES6#TRPBF, it delivers 2× better light-load efficiency and 6× lower active IQ at the cost of larger inductor size.
Availability
LTC3429BES6#TRPBF is available at Aetrix Electronics and suitable for GPS receivers, handheld instruments, digital cameras, and MP3 players requiring stable component supply, long battery life, and EMI-sensitive power delivery.
Supply support for LTC3429BES6#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 continues to manufacture and support its precision analog and power management portfolio under the ADI brand.
The LTC3429BES6#TRPBF belongs to Linear's micropower DC/DC converter family designed specifically for space- and energy-constrained portable electronics, emphasizing ultra-low start-up voltage, true output disconnect, and minimal external component count.
FAQ
What is the key functional difference between LTC3429BES6#TRPBF and LTC3429ES6#TRPBF?
The LTC3429BES6#TRPBF operates in continuous switching mode at all load levels, while the LTC3429ES6#TRPBF enters Burst Mode below ~1.25mA load to reduce quiescent current to ~20µA. This makes the LTC3429BES6#TRPBF preferable for noise-sensitive applications like GPS RF sections or audio DACs where Burst Mode ripple is unacceptable. Both share identical pinout, package, and core specifications including 0.85V start-up and true output disconnect.
Can LTC3429BES6#TRPBF generate 5V output from a 3.6V Li-ion cell?
Yes, the LTC3429BES6#TRPBF can regulate up to 5V output, but requires an external Schottky diode from SW to VOUT when VOUT > 4.3V to clamp SW voltage below 6V. This configuration sacrifices true output disconnect functionality. For applications requiring both 5V output and output disconnect, an active snubber network (as shown in Figure TA04 of the datasheet) must be used instead of the Schottky diode.
What is the minimum inductor value recommended for LTC3429BES6#TRPBF in a 3.3V@250mA application?
A 4.7µH inductor is the standard recommendation for the LTC3429BES6#TRPBF in 3.3V output applications drawing up to 250mA from a 2-cell AA source. This value balances size, efficiency (>90%), and transient response. Larger inductors (e.g., 10µH) reduce ripple and improve light-load efficiency but increase physical size and may degrade transient performance; smaller values risk exceeding peak current limit or violating stability margins.
Does LTC3429BES6#TRPBF support input voltages above the output voltage?
Yes, the LTC3429BES6#TRPBF supports VIN > VOUT operation by disabling the synchronous rectifier and applying VIN directly to the PMOS gate, effectively operating as a low-dropout linear regulator. However, efficiency drops sharply in this mode (e.g., ~40% at VIN = 4.2V, VOUT = 3.3V, IOUT = 100mA), so output current must be limited to avoid thermal overload. The device remains in regulation but dissipates significantly more power internally.
How does the soft-start function work in LTC3429BES6#TRPBF, and what is its typical duration?
The LTC3429BES6#TRPBF implements soft-start by charging an internal capacitor with a weak current source, ramping peak inductor current from zero to 850mA. Typical soft-start time is 2.5ms (time to reach 90% of final VOUT), but actual duration varies with input voltage, output voltage, and load. Soft-start is reinitialized on every startup or recovery from shutdown and prevents inrush current spikes that could brown out weak batteries or damage input capacitors.
LTC3429BES6#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
LTC3429BES6#TRPBF FAQ
1.How can I place an order for LTC3429BES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3429BES6#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 LTC3429BES6#TRPBF reliable?
The price and inventory of LTC3429BES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3429BES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3429BES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3429BES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3429BES6#TRPBF?
LTC3429BES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3429BES6#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 LTC3429BES6#TRPBF?
For technical support, including LTC3429BES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3429BES6#TRPBF requirements.
6.How does Aetrix verify that LTC3429BES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3429BES6#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 LTC3429BES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3429BES6#TRPBF?
All LTC3429BES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3429BES6#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 LTC3429BES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC3429BES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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