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Analog Devices Inc. LTC3459ES6#TRPBF
- Part No.:
- LTC3459ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3459ES6#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 60MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,292
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Product details
Overview
LTC3459ES6#TRPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous boost converter IC designed for low-current, size-constrained portable power rails. It operates from 1.5V to 5.5V input, delivers programmable output from 2.5V to 10V, achieves >85% efficiency across load currents from 0.01mA to 30mA, and features ultralow 10μA quiescent current - enabling use in supercapacitor charging and LCD bias circuits powered by single Li-ion or dual alkaline cells.
For engineers reviewing the LTC3459ES6#TRPBF datasheet, LTC3459ES6#TRPBF pinout, LTC3459ES6#TRPBF application, or LTC3459ES6#TRPBF equivalent, key selection criteria include its Burst Mode® operation for high light-load efficiency, internal N- and P-channel MOSFETs eliminating external diode need, inrush current limiting during startup, output disconnect in shutdown (<1μA IQ), and compatibility with 22μH inductors and ceramic capacitors in space-limited layouts.
Technical Context
The LTC3459ES6#TRPBF employs a fixed-frequency, peak-current-controlled synchronous boost architecture with Burst Mode® regulation. Its tOFF timer dynamically adjusts off-time inversely proportional to (VOUT – VIN), maintaining continuous inductor current during burst packets to improve output current capability. Anticross-conduction circuitry prevents simultaneous conduction of internal N- and P-channel MOSFETs.
It integrates a 1.22V reference, zero-current detection comparator, sleep delay logic, and thermal protection. The IC regulates VOUT below VIN (buck-like behavior at reduced efficiency) and supports programmable output via external resistor divider on FB, with feedback voltage accuracy of ±2.5% over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.5V to 5.5V - supports single Li-ion (2.5–4.2V), dual alkaline (1.8–3.0V), or triple NiMH cells without external LDO pre-regulation. |
| VOUT Programmability | 2.5V to 10V - set via external R1/R2 divider; enables flexible rail generation for OLED bias, sensor excitation, or backup power. |
| Peak Switch Current | 60–90mA (typ. 75mA) - defines maximum sustainable output current with 22μH inductor and 3.3V input. |
| Quiescent Current | 10μA - enables multi-year battery life in always-on IoT sensors and memory backup circuits. |
| Shutdown Current | <1μA - ensures negligible drain during system sleep, critical for energy-harvesting and coin-cell applications. |
| Feedback Voltage | 1.19V to 1.25V - tight 2.5% tolerance enables accurate output regulation without trimming. |
| Switching Frequency | ~2MHz - allows use of compact 15–33μH ferrite inductors and sub-10μF ceramic output capacitors. |
Pinout & Package
Package: 6-lead TSOT-23 (S6), 2.9mm × 1.6mm × 0.95mm profile, exposed pad (GND) soldered to PCB for thermal performance (θJA = 192°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Power switch node | Connects to inductor; drives internal N-channel MOSFET to GND during on-time and P-channel MOSFET to VOUT during off-time. |
| GND (Pin 2) | Signal and power ground | Reference for all internal circuitry; must be low-impedance path to input/output capacitor negatives. |
| FB (Pin 3) | Feedback input | Monitors divided VOUT; sets regulation point via VOUT = 1.22 × (1 + R1/R2); leakage <50nA avoids divider error. |
| SHDN (Pin 4) | Enable/disable control | Logic-high (>1V) enables operation; logic-low disables IC and disconnects VOUT from VIN. |
| VOUT (Pin 5) | Regulated output | Delivers programmed voltage; requires 2.2–10μF X5R ceramic capacitor for stable regulation and ripple control. |
| VIN (Pin 6) | Input supply | Accepts 1.5–5.5V source; bypassed with ≥1μF ceramic capacitor close to pin for EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated N- and P-channel MOSFETs eliminate external Schottky diode, reducing component count and improving efficiency at light loads. |
| Burst Mode® operation | Reduces switching activity at light loads, maintaining >85% efficiency down to 10μA output current. |
| Inrush current limiting | Peak current control prevents surge during startup - essential for safe supercapacitor charging without external current limiting. |
| Output disconnect in shutdown | VOUT is actively isolated from VIN when SHDN = GND, preventing backfeed and enabling true zero-power standby. |
| Ultralow quiescent current | 10μA operating IQ enables multi-year runtime on CR2032 or AA/AAA batteries in maintenance-free sensor nodes. |
Applications
| Supercapacitor Charging | LCD/OLED Bias Supply |
|---|---|
Use Scenario: Charging a 2F, 5V Maxwell Ultracap PC5-5 from a 3.3V microcontroller rail to provide backup power during main supply loss. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with controlled inductor current ramp and automatic transition to regulation at 5V. Use Value: Prevents damaging inrush via peak current limiting; delivers precise 5V output with <1% regulation error using 1.22V reference and external divider. | Use Scenario: Generating 8V bias for small monochrome LCD panels in handheld medical devices powered by two AA alkaline cells. IC Role / Device Role / Timing Role: High-efficiency boost regulator delivering stable 8V at up to 30mA with minimal board area. Use Value: Achieves >85% efficiency at 30mA load from 3V input, enabling 100+ hours of display operation per battery change. |
| Digital Camera Power Rail | Low-Power Sensor Excitation |
Use Scenario: Providing 5V rail for CMOS image sensor and flash LED driver in ultra-compact digital cameras using single Li-ion battery. IC Role / Device Role / Timing Role: Primary boost converter supplying regulated 5V during active capture mode and entering deep-sleep state between frames. Use Value: 10μA quiescent current extends standby time; Burst Mode® maintains efficiency during intermittent sensor readout bursts. | Use Scenario: Exciting a 10kΩ resistive gas sensor requiring stable 3.3V bias in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Precision low-noise bias generator with tight output regulation and minimal load-dependent drift. Use Value: 1.22V reference accuracy ±2.5% ensures sensor measurement repeatability; low 50nA FB leakage avoids divider-induced offset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3400ES6#TRPBF | Higher 600mA peak current, fixed 5V output (non-programmable), 19μA IQ, same SOT-23 package. | Optimized for higher-current 5V rails (e.g., USB peripherals); lacks VOUT programmability and sub-10μA IQ. | Select LTC3400ES6#TRPBF only if fixed 5V output and higher current capability are required - not suitable for 10V LCD bias or supercap charging. |
| LT1613ES6#TRPBF | 550mA ISW, 1.4MHz, 3mA IQ, supports VIN down to 0.9V, non-synchronous (external diode required). | Better for ultra-low-input applications (e.g., single NiMH), but lower efficiency due to diode loss and higher IQ reduces battery life. | Choose LT1613ES6#TRPBF only when input voltage may drop below 1.5V; otherwise LTC3459ES6#TRPBF offers superior efficiency and integration. |
Compared with LTC3400ES6#TRPBF and LT1613ES6#TRPBF, the LTC3459ES6#TRPBF uniquely balances ultralow IQ (10μA), programmable output (2.5–10V), integrated synchronous switches, and inrush control - making it the optimal choice for precision, long-life, multi-rail portable power where size and battery longevity are critical.
Availability
LTC3459ES6#TRPBF is available at Aetrix Electronics and suitable for supercapacitor charging, LCD/OLED bias, digital camera power rails, low-power sensor excitation, and portable medical device applications requiring stable component supply and long-term lifecycle support.
Supply support for LTC3459ES6#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 LTC3459 belongs to Linear's micropower DC/DC converter product line, engineered specifically for battery-powered portable electronics demanding minimal quiescent current, small solution footprint, and reliable regulation across wide input/output voltage ranges.
FAQ
What is the minimum input voltage required for LTC3459ES6#TRPBF to start switching?
The LTC3459ES6#TRPBF begins switching when VIN exceeds approximately 1.5V - verified by absolute maximum ratings and electrical characteristics tables. Below this threshold, the internal reference and comparators remain inactive. Startup is guaranteed across the full –40°C to 85°C temperature range, with typical operation observed down to 1.45V at room temperature under light load.
Can LTC3459ES6#TRPBF regulate output voltage below input voltage?
Yes, the LTC3459ES6#TRPBF can maintain regulation when VOUT is less than VIN (e.g., 3.3V output from 5V input), operating in a buck-like mode using its internal P-channel MOSFET as a pass element. Efficiency drops compared to boost mode due to higher RDS(ON) of the P-MOSFET, but regulation remains stable with typical VOUT accuracy of ±2.5%.
What is the recommended inductor value for LTC3459ES6#TRPBF in a 5V-output application?
The datasheet specifies a minimum inductor value of 15μH; 22μH is the recommended standard value for 5V output applications (e.g., LTC3459 TA04a). This value balances peak current (75mA typ.), switching frequency (~2MHz), output ripple, and efficiency - with Coilcraft DO3314-223 and Taiyo Yuden LB2016-220 being validated examples.
Does LTC3459ES6#TRPBF require an external Schottky diode?
No, the LTC3459ES6#TRPBF does not require an external Schottky diode. It integrates both N-channel and P-channel MOSFETs for fully synchronous rectification, eliminating diode forward voltage drop and associated power loss - confirmed in the FEATURES section and BLOCK DIAGRAM.
How is output voltage programmed on LTC3459ES6#TRPBF?
Output voltage is programmed using an external resistor divider between VOUT and GND, connected to the FB pin. The formula is VOUT = 1.22V × (1 + R1/R2), where R1 connects VOUT to FB and R2 connects FB to GND. The 1.22V reference has ±2.5% tolerance, and FB input leakage is ≤50nA - ensuring accuracy with standard 1% resistors.
LTC3459ES6#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):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 10V (Switch)
- Current - Output:
- 60mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3459ES6#TRPBF FAQ
1.How can I place an order for LTC3459ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3459ES6#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 LTC3459ES6#TRPBF reliable?
The price and inventory of LTC3459ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3459ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3459ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3459ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3459ES6#TRPBF?
LTC3459ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3459ES6#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 LTC3459ES6#TRPBF?
For technical support, including LTC3459ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3459ES6#TRPBF requirements.
6.How does Aetrix verify that LTC3459ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3459ES6#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 LTC3459ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3459ES6#TRPBF?
All LTC3459ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3459ES6#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 LTC3459ES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC3459ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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