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Analog Devices Inc. LTC3526LBEDC#TRMPBF
- Part No.:
- LTC3526LBEDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3526LBEDC#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,535
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Product details
Overview
LTC3526LBEDC#TRMPBF from Analog Devices (formerly Linear Technology) is a 1MHz fixed-frequency synchronous step-up DC/DC converter with output disconnect, designed for ultra-low-voltage battery-powered systems. 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 operates down to 500mV after startup - enabling extended runtime in noise-sensitive portable electronics.
For engineers reviewing the LTC3526LBEDC#TRMPBF datasheet, LTC3526LBEDC#TRMPBF pinout, LTC3526LBEDC#TRMPBF application, or LTC3526LBEDC#TRMPBF equivalent, key selection criteria include low-noise PWM operation (vs. Burst Mode), anti-ring control for EMI reduction, integrated soft-start, internal synchronous rectification, and DFN-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC3526LBEDC#TRMPBF employs current-mode PWM control with internal compensation and a fixed 1MHz oscillator, ensuring stable regulation across wide input (0.5V–5V) and output (1.5V–5.25V) ranges. Its architecture includes adaptive slope compensation, zero-current detection, and VIN > VOUT pass-through capability - supporting both boost and buck-boost-like behavior without external components.
Unlike the LTC3526L variant, the LTC3526LBEDC#TRMPBF disables Burst Mode and maintains continuous 1MHz switching even at light loads, minimizing output voltage ripple and spectral noise - critical for RF-sensitive applications such as Bluetooth headsets and wireless mice. Anti-ring circuitry actively damps SW-pin ringing during discontinuous conduction mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 1MHz - enables use of compact 4.7µH inductors and ceramic capacitors, minimizing solution footprint. |
| Start-Up Input Voltage | 680mV (typ) - allows reliable startup from single discharged alkaline/NiMH cells below 1V. |
| Output Voltage Range | 1.5V to 5.25V - programmable via external resistor divider on FB pin for flexible system rail generation. |
| Peak Switch Current Limit | 750mA (typ) - supports ≥200mA output at 3.3V from two cells while maintaining stability under transient loads. |
| Quiescent Current (Active) | 250–500µA - low operating IQ preserves battery life without sacrificing regulation accuracy. |
| Shutdown Current | <1µA - ensures near-zero drain during system sleep, critical for always-on sensor nodes. |
| Feedback Reference Voltage | 1.195V (±30mV) - precise internal reference enables accurate output voltage setting across temperature. |
Pinout & Package
The LTC3526LBEDC#TRMPBF is housed in a thermally enhanced 6-lead (2mm × 2mm × 0.75mm) plastic DFN package with exposed pad (Pin 7) that must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects internal N-MOSFET drain to inductor; requires short, wide trace to minimize EMI and switching losses. |
| GND (Pins 2 & 7) | Signal and power ground | Pins 2 (edge) and 7 (exposed pad) form low-impedance return path; exposed pad must be soldered to PCB ground plane for θJA = 102°C/W. |
| VIN (Pin 3) | Input supply | Accepts 0.5V–5V input; requires ≥2.2µF ceramic decoupling capacitor placed adjacent to pin. |
| SHDN (Pin 4) | Logic-controlled shutdown | Active-high enable; internal 4MΩ pull-down; drives <1µA IQ when pulled low. |
| FB (Pin 5) | Feedback input | Monitors output via resistive divider; sets VOUT = 1.195V × (1 + R1/R2); high-impedance (≤50nA bias). |
| VOUT (Pin 6) | Output voltage sense / sync rectifier drain | Senses regulated output and connects to internal P-MOSFET source; requires short trace to output capacitor (≥4.7µF). |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise fixed-frequency PWM | Eliminates Burst Mode switching artifacts, reducing conducted/radiated EMI in audio and RF circuits. |
| Output disconnect | Prevents reverse current flow and body-diode conduction during shutdown - enables true zero-VOUT state and safe hot-swap capability. |
| Anti-ring control | Internally connects damping resistor across inductor during DCM, suppressing high-frequency SW-node ringing without external components. |
| Integrated soft-start | Ramps peak inductor current from 0 to 750mA over ~0.5ms, preventing inrush into large output capacitors or heavy loads. |
| VIN > VOUT operation | Maintains regulation even when input exceeds output (e.g., Li-ion at 4.2V → 3.3V), enabling single-rail flexibility without external LDO. |
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: Primary step-up regulator providing regulated output with output disconnect to isolate battery during standby. Use Value: 680mV start-up extends usable battery life beyond typical cutoff; 1MHz switching minimizes filter component size in compact enclosures. | Use Scenario: Active noise cancellation circuitry in battery-powered headphones where switching noise must not interfere with analog audio paths. IC Role / Device Role / Timing Role: Low-noise 3.3V/5V supply for DSP and analog front-end, operating continuously at 1MHz to avoid audible beat frequencies. Use Value: Fixed-frequency PWM and anti-ring control reduce EMI-induced audio artifacts; output disconnect prevents battery drain during transport mode. |
| Wireless Mice | Bluetooth Headsets |
Use Scenario: Ultra-low-power 2.4GHz RF transceiver modules in optical mice using two alkaline cells, requiring consistent 3.3V supply across full battery discharge curve. IC Role / Device Role / Timing Role: Synchronous boost converter delivering 200mA peak current with minimal quiescent draw during deep-sleep intervals. Use Value: 500mV operating limit and <1µA shutdown current maximize shelf life; DFN-6 footprint fits tight PCB real estate constraints. | Use Scenario: Compact Bluetooth headset with dual-microphone array and codec, needing clean, ripple-free 3.3V supply for sensitive analog microphone bias and ADC references. IC Role / Device Role / Timing Role: Primary power stage supplying regulated rail to RF SoC and audio subsystem, with EMI suppression critical for link stability. Use Value: Anti-ring control and fixed-frequency operation prevent RF interference with Bluetooth 2.4GHz band; output disconnect avoids battery leakage during pairing timeout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3526LEDC#TRMPBF | Burst Mode enabled; 9µA IQ in light-load sleep vs. continuous 1MHz in LTC3526LBEDC#TRMPBF | Better for ultra-low-power intermittent wake-up systems (e.g., IoT sensors); higher output ripple in Burst Mode | Select LTC3526LEDC#TRMPBF only if minimum IQ dominates design priority over noise/ripple. |
| TPS61200DRCT | 500kHz max frequency; no anti-ring; 500mV start-up; different pinout (no VOUT pin - uses FB-only feedback) | Lacks output disconnect and SW-node damping; less suitable for noise-critical audio/RF apps | Choose TPS61200DRCT only for cost-sensitive, non-EMI-sensitive applications with relaxed layout constraints. |
Compared with LTC3526LEDC#TRMPBF, the LTC3526LBEDC#TRMPBF trades lower light-load efficiency for superior EMI performance and predictable ripple; versus TPS61200DRCT, it offers tighter regulation, integrated output disconnect, and proven low-noise operation in portable audio designs.
Availability
LTC3526LBEDC#TRMPBF is available at Aetrix Electronics and suitable for medical instruments, noise-canceling headphones, wireless mice, and Bluetooth headsets requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for LTC3526LBEDC#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 and maintains its legacy of high-performance analog ICs for precision power, signal conditioning, and timing applications.
The LTC3526L/LTC3526LB family was engineered specifically for battery-powered portable electronics demanding ultra-low-voltage start-up, minimal EMI, and high conversion efficiency in sub-2mm² footprints.
FAQ
What is the minimum input voltage required for LTC3526LBEDC#TRMPBF to start up?
The LTC3526LBEDC#TRMPBF guarantees startup at 680mV (typical) input voltage, with operation sustained down to 500mV once running. This enables reliable function from deeply discharged single-cell alkaline or NiMH batteries. The device uses an independent startup oscillator and internal charge pump to bootstrap operation below conventional regulator thresholds - a key differentiator of the LTC3526LBEDC#TRMPBF in ultra-low-voltage applications.
How does LTC3526LBEDC#TRMPBF differ from LTC3526LEDC#TRMPBF in operation?
The LTC3526LBEDC#TRMPBF disables Burst Mode and maintains continuous 1MHz PWM switching at all load levels, whereas the LTC3526LEDC#TRMPBF enters Burst Mode under light loads to achieve 9µA quiescent current. This makes the LTC3526LBEDC#TRMPBF preferable for noise-sensitive applications like audio codecs and RF receivers, where switching frequency harmonics must remain deterministic and ripple minimized - a distinction clearly defined in the LTC3526LBEDC#TRMPBF datasheet.
Does LTC3526LBEDC#TRMPBF support output voltages above 3.3V?
Yes, the LTC3526LBEDC#TRMPBF supports output voltages from 1.5V to 5.25V, set by an external resistor divider on the FB pin using the formula VOUT = 1.195V × (1 + R1/R2). Typical configurations include 5V for USB-peripheral interfacing or Li-ion charging circuits, with verified performance up to 200mA at 5V from two alkaline cells - confirmed in the LTC3526LBEDC#TRMPBF typical application schematics.
What is the purpose of the exposed pad (Pin 7) on LTC3526LBEDC#TRMPBF?
The exposed pad (Pin 7) on the LTC3526LBEDC#TRMPBF serves as an additional GND connection and primary thermal dissipation path. It must be soldered to the PCB ground plane to achieve the specified θJA of 102°C/W; failure to do so results in significantly higher junction temperatures and potential thermal shutdown. This mechanical and thermal requirement is explicitly mandated in the LTC3526LBEDC#TRMPBF package drawing and thermal characterization data.
Can LTC3526LBEDC#TRMPBF operate when input voltage exceeds the output voltage?
Yes, the LTC3526LBEDC#TRMPBF supports VIN > VOUT operation - maintaining regulation even when input rises above the programmed output (e.g., 4.2V Li-ion → 3.3V rail). In this mode, the internal P-channel MOSFET remains active as a synchronous rectifier, but efficiency drops due to reduced duty cycle and increased conduction loss. This feature is documented in the LTC3526LBEDC#TRMPBF Applications Information section and validated in typical performance curves.
LTC3526LBEDC#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3526LBEDC#TRMPBF FAQ
1.How can I place an order for LTC3526LBEDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3526LBEDC#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#TRMPBF reliable?
The price and inventory of LTC3526LBEDC#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3526LBEDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3526LBEDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3526LBEDC#TRMPBF?
LTC3526LBEDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3526LBEDC#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#TRMPBF?
For technical support, including LTC3526LBEDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3526LBEDC#TRMPBF requirements.
6.How does Aetrix verify that LTC3526LBEDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3526LBEDC#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3526LBEDC#TRMPBF?
All LTC3526LBEDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3526LBEDC#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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3526LBEDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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