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Analog Devices Inc. LTC3526LBEDC-2#TRMPBF
- Part No.:
- LTC3526LBEDC-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3526LBEDC-2#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3526LBEDC-2#TRMPBF from Analog Devices (formerly Linear Technology) is a 2MHz fixed-frequency synchronous step-up DC/DC converter with output disconnect, housed in a 6-lead 2mm × 2mm × 0.75mm DFN package. It delivers up to 200mA at 3.3V from two alkaline/NiMH cells, features 680mV start-up voltage, 1.5V–5.25V adjustable output, and anti-ring control for EMI reduction - ideal for noise-sensitive portable electronics.
For engineers reviewing the LTC3526LBEDC-2#TRMPBF datasheet, LTC3526LBEDC-2#TRMPBF pinout, LTC3526LBEDC-2#TRMPBF application, or LTC3526LBEDC-2#TRMPBF equivalent, key selection criteria include low-noise fixed-frequency operation (vs. Burst Mode), output disconnect capability, thermal shutdown behavior, and compatibility with ultra-low-input-voltage battery sources down to 500mV during operation.
Technical Context
The LTC3526LBEDC-2#TRMPBF implements current-mode PWM control with internal slope compensation and fully integrated N-channel switch (0.4Ω RDS(ON)) and P-channel synchronous rectifier (0.6Ω RDS(ON)). Its 2MHz oscillator enables use of sub-3mm inductors and ceramic capacitors, while zero-current detection disables the rectifier at ~30mA to prevent reverse conduction.
Unlike the LTC3526L-2 variant, the LTC3526LB-2 version (including LTC3526LBEDC-2#TRMPBF) operates exclusively in fixed-frequency PWM mode - eliminating Burst Mode transitions and associated output ripple modulation, making it suitable for RF and audio subsystems where spectral purity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2MHz (typical); enables compact 2.2µH inductor and 4.7µF ceramic output capacitor designs |
| Start-Up Input Voltage | 680mV (typical); allows reliable startup from single discharged alkaline/NiMH cells |
| Output Voltage Range | 1.5V to 5.25V (adjustable via external resistor divider); supports common logic rails including 1.8V, 2.85V, 3.3V, and 5V |
| Peak Switch Current Limit | 550mA (min), 750mA (typ); sets maximum deliverable output current under low-VIN conditions |
| Quiescent Current (Active) | 250–500µA; defines baseline power draw during regulation, excluding switching losses |
| Shutdown Current | <1µA; ensures near-zero battery drain when disabled, critical for long-term standby |
| Feedback Reference Voltage | 1.195V (typ); determines output setpoint accuracy and stability across temperature |
Pinout & Package
Package: 6-lead (2mm × 2mm × 0.75mm) plastic DFN with exposed thermal pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 102°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt switching current; requires short, wide PCB trace to minimize EMI |
| GND (Pin 2 + Exposed Pad Pin 7) | Signal and power ground | Primary return path for input/output capacitors and internal power switches; exposed pad must be soldered for thermal management |
| VIN (Pin 3) | Input supply | Accepts 0.5V–5V after startup; minimum 2.2µF ceramic decoupling required close to pin |
| SHDN (Pin 4) | Logic-controlled enable | Active-high input with 4MΩ internal pull-down; drives <1µA shutdown current when pulled low |
| FB (Pin 5) | Feedback input | Monitors resistive divider output; regulates VOUT to 1.195V reference; sensitive to noise - minimize trace length |
| VOUT (Pin 6) | Regulated output / rectifier drain | Provides regulated output voltage and serves as drain terminal of internal P-channel MOSFET; connects directly to output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-frequency 2MHz PWM operation | Eliminates variable-frequency artifacts in sensitive analog/RF circuits; simplifies EMI filtering |
| Output disconnect with no body-diode conduction | Enables true zero-VOUT shutdown and prevents reverse current into battery during off-state |
| Anti-ring control circuitry | Damps SW-node ringing in discontinuous conduction mode, reducing radiated EMI without external components |
| Integrated soft-start (≈0.5ms) | Prevents inrush current into large output capacitors; ramps peak inductor current to 750mA smoothly |
| Thermal shutdown (160°C) | Protects device during overload or poor heatsinking; auto-recovery at ≈145°C junction temperature |
Applications
| Medical Instruments | Noise Canceling Headphones |
|---|---|
Use Scenario: Portable glucose meters and handheld diagnostic tools powered by single AA/AAA cells requiring stable 3.3V rail under varying battery voltage. IC Role / Device Role / Timing Role: Step-up regulator providing regulated output with output disconnect to isolate battery during sleep mode. Use Value: 680mV start-up extends usable battery life; fixed-frequency operation avoids interference with sensitive analog sensor front-ends. | Use Scenario: Battery-powered active noise cancellation circuits needing clean, low-ripple 1.8V or 2.85V supply for op-amps and ADCs. IC Role / Device Role / Timing Role: Low-noise boost converter delivering stable rail without Burst Mode-induced frequency modulation. Use Value: 2MHz fixed switching minimizes audible beat frequencies; anti-ring control suppresses high-frequency EMI coupling into audio paths. |
| Wireless Mice | Bluetooth Headsets |
Use Scenario: Ultra-low-power optical mice using coin-cell batteries, requiring intermittent 3.3V bursts for RF transmission and sensor activation. IC Role / Device Role / Timing Role: Efficient boost converter enabling >1-year battery life via deep shutdown (<1µA) and low quiescent current. Use Value: Output disconnect prevents battery self-discharge through load leakage; 500mV operating floor maximizes energy extraction. | Use Scenario: Compact Bluetooth earbuds needing regulated 5V for radio ICs from a 3.7V Li-ion cell with minimal board area. IC Role / Device Role / Timing Role: Step-up converter supporting VIN > VOUT operation with short-circuit protection and thermal foldback. Use Value: Internal 400mA short-circuit current limit reduces dissipation during accidental VOUT-to-GND faults; small DFN footprint saves space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3526LEDC-2#TRMPBF | Includes Burst Mode® operation (9µA IQ), not fixed-frequency PWM; same pinout and package | Better suited for ultra-low-power applications with highly variable load profiles | Select LTC3526LEDC-2#TRMPBF only if light-load efficiency dominates over spectral noise requirements |
| TPS61291DRVR | 2.5MHz switching, 500mV start-up, but lacks output disconnect and anti-ring control | Higher frequency allows smaller passives, but no true output isolation during shutdown | Choose TPS61291DRVR only when board space is more constrained than EMI/noise sensitivity |
Compared with LTC3526LEDC-2#TRMPBF, the LTC3526LBEDC-2#TRMPBF trades light-load efficiency for spectral cleanliness; versus TPS61291DRVR, it provides superior battery isolation and EMI mitigation at the cost of slightly higher minimum input voltage.
Availability
LTC3526LBEDC-2#TRMPBF is available at Aetrix Electronics and suitable for medical instrumentation, noise-canceling audio systems, wireless peripherals, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3526LBEDC-2#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3526L/LB family was designed specifically for space-constrained, battery-powered portable electronics requiring ultra-low-voltage start-up, high efficiency, and low-noise power conversion - with LTC3526LBEDC-2#TRMPBF optimized for fixed-frequency, EMI-sensitive applications.
FAQ
What is the minimum input voltage required for LTC3526LBEDC-2#TRMPBF to start up?
The LTC3526LBEDC-2#TRMPBF has a typical start-up input voltage of 680mV, with a maximum specified value of 800mV across temperature. Once started, it continues regulating down to 500mV input - making it suitable for deeply discharged single-cell alkaline or NiMH batteries. This capability is enabled by an independent start-up oscillator and dedicated charge pump circuitry internal to the LTC3526LBEDC-2#TRMPBF.
Does LTC3526LBEDC-2#TRMPBF support output voltages higher than the input voltage?
Yes, the LTC3526LBEDC-2#TRMPBF is a step-up (boost) converter and inherently supports VOUT > VIN. It can also regulate when VIN exceeds VOUT (e.g., 4.2V Li-ion to 3.3V), though efficiency drops significantly and maximum output current is reduced. The LTC3526LBEDC-2#TRMPBF maintains regulation in this mode using its synchronous rectifier and current-mode control loop.
How does the output disconnect feature work in LTC3526LBEDC-2#TRMPBF?
The LTC3526LBEDC-2#TRMPBF achieves true output disconnect by disabling the internal P-channel MOSFET rectifier and preventing body-diode conduction during shutdown. When SHDN is pulled low, VOUT falls to 0V with no reverse current into VIN - unlike basic boost converters that leak through the rectifier's intrinsic diode. This protects batteries and enables safe hot-plug operation. The LTC3526LBEDC-2#TRMPBF requires no external components to realize this function.
What is the purpose of the anti-ring circuit in LTC3526LBEDC-2#TRMPBF?
The anti-ring circuit in the LTC3526LBEDC-2#TRMPBF actively damps high-frequency ringing on the SW pin during discontinuous conduction mode by temporarily connecting a resistor between SW and VIN. This suppresses low-energy but spectrally broad resonant oscillations formed by the inductor and SW-node capacitance - reducing radiated EMI without requiring external snubbers or ferrite beads. It is automatically engaged only when needed, with no user configuration required for the LTC3526LBEDC-2#TRMPBF.
Can LTC3526LBEDC-2#TRMPBF be used with a 5V output from a 3.6V input?
Yes, the LTC3526LBEDC-2#TRMPBF supports 5V output from inputs as low as 1.6V, including 3.6V. In this case, duty cycle is ~30%, well within the 0–90% operational range. Typical applications show 150mA output at 5V from 1.6–3.2V input using a 3.3µH inductor and 10µF output capacitor. Efficiency remains above 85% at moderate loads, and the LTC3526LBEDC-2#TRMPBF's internal compensation ensures stable regulation without external components.
LTC3526LBEDC-2#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- 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):
- 5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 550mA (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3526LBEDC-2#TRMPBF FAQ
1.How can I place an order for LTC3526LBEDC-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3526LBEDC-2#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 LTC3526LBEDC-2#TRMPBF reliable?
The price and inventory of LTC3526LBEDC-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3526LBEDC-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3526LBEDC-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3526LBEDC-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3526LBEDC-2#TRMPBF?
LTC3526LBEDC-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3526LBEDC-2#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 LTC3526LBEDC-2#TRMPBF?
For technical support, including LTC3526LBEDC-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3526LBEDC-2#TRMPBF requirements.
6.How does Aetrix verify that LTC3526LBEDC-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3526LBEDC-2#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 LTC3526LBEDC-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3526LBEDC-2#TRMPBF?
All LTC3526LBEDC-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3526LBEDC-2#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 LTC3526LBEDC-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3526LBEDC-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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