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Analog Devices Inc. LTC3527EUD#TRPBF
- Part No.:
- LTC3527EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3527EUD#TRPBF.pdf
- Description:
- IC REG BOOST ADJ DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,950
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Product details
Overview
LTC3527EUD#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-up DC/DC converter IC with independent 800mA and 400mA current-limited channels, operating at 1.2MHz or 2.2MHz, delivering regulated 1.6V–5.25V outputs from input as low as 0.7V startup-enabling single- or dual-cell alkaline/NiMH battery operation in portable audio and medical devices.
For engineers reviewing the LTC3527EUD#TRPBF datasheet, LTC3527EUD#TRPBF pinout, LTC3527EUD#TRPBF application, or LTC3527EUD#TRPBF equivalent, key selection criteria include dual-channel burst-mode efficiency down to 12μA quiescent current, true output disconnect in shutdown, selectable switching frequency via FSEL, and thermal shutdown with 125°C junction limit.
Technical Context
The LTC3527EUD#TRPBF integrates two independent current-mode PWM boost converters sharing a single oscillator for in-phase switching, each with internal NMOS/PMOS synchronous rectifiers, adaptive slope compensation, and lossless peak-current sensing. It supports VIN > VOUT operation with line regulation of 0.005%/V and feedback voltage accuracy of ±2% over temperature.
Startup is enabled by a dedicated low-voltage oscillator initiating at 0.7V (typ), transitioning to self-bias from VOUT once VOUT exceeds VIN by 0.24V; soft-start ramps peak inductor current to 900mA (CH1) or 500mA (CH2) in 0.5ms, while anti-ringing circuitry connects a 100Ω switch from SWx to VINx during discontinuous conduction to suppress EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Startup Voltage | 0.7V (typ) - enables operation from near-dead single-cell batteries without external charge pump. |
| Input Voltage Range | 0.5V–5V after startup - supports deep discharge recovery and VIN > VOUT buck-like operation. |
| Output Voltage Range | 1.6V–5.25V per channel - programmable via external resistor dividers referenced to 1.20V FB threshold. |
| Switching Frequency | 1.2MHz (FSEL = low) or 2.2MHz (FSEL = high) - tradeoff between efficiency (1.2MHz) and solution size (2.2MHz). |
| Peak Efficiency | 94% - achieved at mid-load with 1.2MHz fixed-frequency mode and optimized inductor/capacitor selection. |
| Quiescent Current | 12μA in Burst Mode - maintains ultra-low power draw during standby in always-on portable systems. |
| Current Limits | 800mA (CH1), 400mA (CH2) - internally set, temperature-compensated limits prevent MOSFET overstress under overload. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed PGND pad (Pin 17), requiring soldering to PCB ground plane for thermal and power integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN1 (1) | Channel 1 shutdown control | Logic-high enables CH1; internal 4MΩ pull-down ensures default-off; both SHDN pins must be low for <2μA total shutdown current. |
| FB1 (2) | Channel 1 feedback input | Connects to resistor divider tap; regulates VOUT1 to 1.20V reference; input bias current ≤50nA minimizes divider error. |
| MODE (3) | Operating mode select | Low = Burst Mode (12μA IQ); high = fixed-frequency PWM; requires ≥1V to guarantee fixed-frequency across temp. |
| VIN1 (4) | Channel 1 input supply | Dedicated input pin; allows independent sourcing (e.g., separate battery cells); bypass capacitor required. |
| VOUT1 (5) | Channel 1 output sense & bias | Drain of internal PMOS rectifier; supplies gate drive bias; trace to output cap must be short/wide to minimize noise. |
| SW1 (6) | Channel 1 power switch node | Connects to inductor; internal anti-ringing switch (100Ω to VIN1) activates during DCM to suppress EMI ringing. |
| SW2 (7) | Channel 2 power switch node | Same function as SW1 but for CH2; independent DCM anti-ringing control prevents cross-talk. |
| VOUT2 (8) | Channel 2 output sense & bias | Drain of CH2 PMOS rectifier; provides gate bias; requires low-inductance path to COUT2. |
| VIN2 (9) | Channel 2 input supply | Dedicated input; enables dual-input configurations; must be tied to higher VIN if VIN1 ≠ VIN2. |
| FSEL (10) | Frequency select input | Low = 1.2MHz, high = 2.2MHz; thresholds defined (0.35V low, 0.88V high) for robust logic-level compatibility. |
| FB2 (11) | Channel 2 feedback input | Identical function to FB1 for VOUT2; supports independent output programming. |
| SHDN2 (12) | Channel 2 shutdown control | Independent control; sequencing with SHDN1 enables staggered startup or fault isolation. |
| PGOOD2 (13) | Channel 2 power-good flag | Open-drain output low when VFB2 is >9% below 1.20V; used for system sequencing or fault detection. |
| GND (14) | Signal ground reference | Reference for internal analog circuitry; separate from PGND (exposed pad) to reduce noise coupling. |
| VIN (15) | Shared input supply | Third VIN pin; must connect to highest input voltage when using dual inputs; bypass capacitor mandatory. |
| PGOOD1 (16) | Channel 1 power-good flag | Open-drain, identical behavior to PGOOD2; enables independent monitoring of CH1 regulation status. |
| PGND (17) | Power ground / thermal pad | Exposed pad; must be soldered to PCB ground plane; carries high-switching currents and conducts heat away from die. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates body-diode conduction during shutdown, enabling zero-output voltage and preventing reverse current into weak batteries. |
| Independent soft-start & inrush limiting | Ramps CH1/CH2 peak current separately to 900mA/500mA in 0.5ms, allowing safe startup into heavy capacitive loads without input surge. |
| Anti-ringing control | Internal 100Ω switch from SWx to VINx during DCM suppresses high-frequency resonance, reducing EMI without external components. |
| Thermal shutdown with hysteresis | Shuts down at 160°C junction; restarts at ~145°C, protecting against sustained overload while avoiding thermal cycling instability. |
| Self-bias operation | Transfers bias from higher VOUT to internal circuitry once VOUT > VIN + 0.24V, eliminating dependency on low VIN for continued operation. |
Applications
| Wireless Headsets | Portable Medical Sensors |
|---|---|
Use Scenario: Noise-canceling Bluetooth headsets powered by single AAA alkaline cell requiring stable 3.3V for RF section and 1.8V for DSP core. IC Role / Device Role / Timing Role: Dual-channel boost converter providing independent, sequenced 3.3V/1.8V rails with burst-mode efficiency to extend talk time. Use Value: 94% peak efficiency and 12μA Burst Mode IQ enable >10-hour battery life; true disconnect prevents battery drain during sleep. | Use Scenario: Handheld pulse oximeter using two NiMH cells to power LED drivers (3.3V) and analog front-end (5.0V) with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous boost IC delivering clean, low-noise 3.3V/5.0V outputs with 2.2MHz option for compact filter design. Use Value: Anti-ringing control and fixed-frequency PWM reduce conducted EMI; 0.7V startup ensures operation until cell voltage drops to 0.5V. |
| MP3 Player Audio Amplifiers | Industrial Wireless Mice |
Use Scenario: Portable MP3 player with Class-D amplifier needing 5V rail from single-cell input, plus 3.3V for microcontroller and memory. IC Role / Device Role / Timing Role: Dual boost converter generating 5V (CH1) and 3.3V (CH2) with independent shutdown for power domain control. Use Value: VIN > VOUT capability allows 5V output even when input rises above 3.3V; thermal shutdown protects during accidental short-circuit. | Use Scenario: Ultra-low-power 2.4GHz wireless mouse using coin cell, requiring 3.3V for MCU and 1.8V for RF transceiver with sub-μA standby. IC Role / Device Role / Timing Role: Dual boost regulator enabling simultaneous 3.3V/1.8V generation with <2μA shutdown current and fast wake-up. Use Value: 0.7V startup extends usable battery range; quick VOUT discharge (LTC3527-1 variant) not applicable here, but LTC3527EUD#TRPBF supports standard disconnect. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65270RGET | Single 2.2MHz boost controller with integrated 2A FETs; no dual independent outputs; requires external inductors and feedback resistors. | Designed for single-rail high-current apps (e.g., LCD bias); lacks independent CH1/CH2 shutdown and PGOOD per channel. | Select when only one regulated output is needed and higher current (>400mA) is required; not suitable for dual-rail sequencing. |
| MAX77801EWL+T | Dual 2.5MHz boost with I²C interface, programmable VOUT, and dynamic voltage scaling; 600mA/300mA limits; 1.8V min VIN. | Targeted at smartphone/tablet PMIC subsystems; adds digital control but raises BOM cost and design complexity. | Choose for systems needing software-configurable outputs and telemetry; avoid when analog simplicity and 0.7V startup are critical. |
Compared with TPS65270RGET and MAX77801EWL+T, the LTC3527EUD#TRPBF uniquely delivers dual independent boost channels with sub-1V startup, true output disconnect, and pin-selectable frequency-all in a 3mm × 3mm QFN-making it optimal for space-constrained, battery-critical dual-rail portable designs.
Availability
LTC3527EUD#TRPBF is available at Aetrix Electronics and suitable for wireless headsets, portable medical sensors, and industrial wireless mice requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3527EUD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3527EUD#TRPBF belongs to Linear's precision power conversion product line, engineered specifically for ultra-low-voltage, dual-rail portable electronics where battery life, small footprint, and reliability under deep-discharge conditions are paramount.
FAQ
What is the minimum input voltage required to start up the LTC3527EUD#TRPBF?
The LTC3527EUD#TRPBF features a dedicated startup oscillator that initiates operation at 0.7V (typical), enabling reliable startup from nearly depleted single-cell alkaline or NiMH batteries. Once started, it continues operating down to 0.5V input, provided VOUT remains > VIN + 0.24V to sustain self-biasing from the output rail.
Does the LTC3527EUD#TRPBF support independent shutdown of each boost channel?
Yes, the LTC3527EUD#TRPBF provides fully independent shutdown control via SHDN1 (Pin 1) and SHDN2 (Pin 12). Each pin has an internal 4MΩ pull-down, and pulling either low disables its respective channel. Both must be low to achieve <2μA total shutdown quiescent current, enabling flexible power sequencing.
How does the MODE pin affect efficiency and output ripple in the LTC3527EUD#TRPBF?
When MODE is low, the LTC3527EUD#TRPBF enters Burst Mode operation, reducing quiescent current to 12μA and maximizing light-load efficiency-but with ~1% peak-to-peak output ripple. When MODE is high, it operates in fixed-frequency PWM mode, delivering lower ripple (<10mV p-p typical) at the cost of higher light-load current (500–900μA).
Can the LTC3527EUD#TRPBF regulate outputs when input voltage exceeds the output voltage?
Yes, the LTC3527EUD#TRPBF supports VIN > VOUT operation for both channels, maintaining regulation even when input rises above programmed VOUT. However, this mode reduces efficiency and increases power dissipation; output current must be limited per thermal constraints to keep junction temperature below 125°C.
What is the purpose of the exposed pad (Pin 17) on the LTC3527EUD#TRPBF QFN package?
The exposed pad (Pin 17) on the LTC3527EUD#TRPBF is designated PGND - it serves as the primary power ground return for both boost channels' high-current paths and functions as the main thermal conduction path from the die to the PCB. It must be soldered to a solid copper ground plane to ensure proper EMI performance, thermal management, and current handling.
LTC3527EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 0.88V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 1.6V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 400mA (Switch), 800mA (Switch)
- Frequency - Switching:
- 1.2MHz, 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3527EUD#TRPBF FAQ
1.How can I place an order for LTC3527EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3527EUD#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 LTC3527EUD#TRPBF reliable?
The price and inventory of LTC3527EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3527EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3527EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3527EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3527EUD#TRPBF?
LTC3527EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3527EUD#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 LTC3527EUD#TRPBF?
For technical support, including LTC3527EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3527EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3527EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3527EUD#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 LTC3527EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3527EUD#TRPBF?
All LTC3527EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3527EUD#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 LTC3527EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3527EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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