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Analog Devices Inc. LTC3527EUD-1#PBF
- Part No.:
- LTC3527EUD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3527EUD-1#PBF.pdf
- Description:
- IC REG BOOST ADJ DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:108
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Product details
Overview
LTC3527EUD-1#PBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-up DC/DC converter IC with independent 800mA/400mA current-limited channels, 1.2MHz/2.2MHz selectable switching frequency, and true output disconnect in shutdown. It operates from 0.5V input after startup (700mV startup voltage), delivers regulated 1.6V–5.25V outputs, and targets ultra-low-power portable systems such as Bluetooth headsets and wireless mice.
For engineers reviewing the LTC3527EUD-1#PBF datasheet, LTC3527EUD-1#PBF pinout, LTC3527EUD-1#PBF application, or LTC3527EUD-1#PBF equivalent, key selection criteria include dual-channel burst-mode efficiency (<12μA quiescent current), active VOUT discharge on shutdown, 16-pin 3mm×3mm QFN package, and independent VIN1/VIN2 inputs enabling two-cell alkaline/NiMH battery architectures.
Technical Context
The LTC3527EUD-1#PBF integrates two current-mode PWM boost converters sharing a single oscillator for in-phase switching, with adaptive slope compensation and internal soft-start (0.5ms). Each channel features lossless NMOS current sensing, zero-current detection (~30mA), and anti-ringing circuitry (100Ω switch) to suppress EMI during discontinuous conduction mode.
It supports VIN > VOUT operation with thermal shutdown (160°C trip), output disconnect via P-channel synchronous rectifiers, and active VOUT1/VOUT2 discharge when SHDN1/SHDN2 go low - a distinguishing feature of the -1 variant versus standard LTC3527. Feedback regulation uses a fixed 1.20V reference with ±2.4% tolerance over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Startup Voltage | 700mV typical - enables operation from single depleted alkaline/NiMH cell at end-of-life. |
| Input Voltage Range | 0.5V to 5V after startup - supports deep-discharge battery operation without external LDO pre-regulation. |
| Output Voltage Range | 1.6V to 5.25V per channel - programmable via external resistor dividers; suitable for 1.8V, 3.3V, and 5V rails. |
| Switching Frequency | 1.2MHz (FSEL = low) or 2.2MHz (FSEL = high) - trade-off between efficiency (1.2MHz) and solution size (2.2MHz). |
| Quiescent Current | 12μA in Burst Mode - extends battery life in standby; <2μA in full shutdown with both SHDN pins low. |
| Current Limits | 800mA (CH1), 400mA (CH2) - peak NMOS switch current limits; halved if VOUT drops below 1V. |
| Efficiency | Up to 94% - achieved at mid-load with optimized inductor/capacitor selection and synchronous rectification. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed PGND pad (Pin 17), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN1 (Pin 1) | Channel 1 shutdown control | Logic-high enables CH1; internal 4MΩ pull-down ensures default off; must pair with SHDN2 for <2μA total shutdown current. |
| FB1 (Pin 2) | Channel 1 feedback input | Connects to resistor divider tap; regulates VOUT1 to 1.20V reference; 1–50nA input bias minimizes divider error. |
| MODE (Pin 3) | Operating mode select | Low = Burst Mode (12μA IQ); High = fixed-frequency PWM; threshold: 0.35V/1.0V logic levels. |
| VIN1 (Pin 4) | Channel 1 input supply | Dedicated input for CH1; allows independent power sources (e.g., separate battery cells) per channel. |
| VOUT1 (Pin 5) | Channel 1 output sense & bias | Sense node for feedback; also supplies gate bias to internal synchronous rectifier; requires short PCB trace to output cap. |
| SW1 (Pin 6) | Channel 1 power switch node | Connects to inductor; internal NMOS/PMOS switches; anti-ringing switch engages during DCM to suppress EMI. |
| SW2 (Pin 7) | Channel 2 power switch node | Same function as SW1 but for CH2; shares oscillator timing with SW1 for in-phase switching. |
| VOUT2 (Pin 8) | Channel 2 output sense & bias | Identical role to VOUT1 for CH2; enables independent regulation of second output rail. |
| VIN2 (Pin 9) | Channel 2 input supply | Dedicated input for CH2; supports asymmetric input configurations (e.g., CH1 on cell 1, CH2 on cell 2). |
| FSEL (Pin 10) | Frequency select input | Low = 1.2MHz, High = 2.2MHz; sets oscillator frequency for both channels simultaneously. |
| FB2 (Pin 11) | Channel 2 feedback input | Same function as FB1 for CH2; enables independent output voltage programming. |
| SHDN2 (Pin 12) | Channel 2 shutdown control | Identical behavior to SHDN1; required to be asserted with SHDN1 for full system shutdown. |
| PGOOD2 (Pin 13) | Channel 2 power-good indicator | Open-drain output; pulls low when VFB2 is >9% below 1.20V - used for sequencing or fault monitoring. |
| GND (Pin 14) | Signal ground reference | Reference for internal analog circuitry; must be connected to clean ground plane, separate from PGND if possible. |
| VIN (Pin 15) | Common input supply | Third VIN pin; must connect to higher of VIN1/VIN2 when supplies differ; bypass capacitor required. |
| PGOOD1 (Pin 16) | Channel 1 power-good indicator | Open-drain output identical to PGOOD2; enables independent monitoring of CH1 regulation status. |
| PGND (Pin 17) | Power ground / thermal pad | Exposed pad; must be soldered to PCB ground plane for thermal dissipation and low-impedance return path for VOUT1/VOUT2. |
Key Features
| Feature | Design Value |
|---|---|
| Active VOUT discharge on shutdown | LTC3527EUD-1#PBF actively pulls VOUT1/VOUT2 to ground when SHDN1/SHDN2 go low - eliminates residual charge in portable devices requiring rapid power cycling. |
| True output disconnect | Eliminates body-diode conduction in P-channel rectifiers, preventing reverse current into battery during shutdown - critical for battery-backed systems. |
| Independent dual-input architecture | VIN1 and VIN2 allow separate battery cells per channel; VIN pin ties to higher supply - enables flexible two-cell alkaline/NiMH topologies without external diodes. |
| Burst Mode with seamless transition | 12μA quiescent current in light-load Burst Mode; automatic return to fixed-frequency PWM without output transient - enabled by shared oscillator and internal loop compensation. |
| Inrush current limiting & soft-start | 0.5ms soft-start ramps peak inductor current to 900mA (CH1) / 500mA (CH2); prevents input surge during cold start into capacitive loads. |
Applications
| Noise-Canceling Bluetooth Headsets | Wireless Optical Mice |
|---|---|
Use Scenario: Dual-rail power for DSP (3.3V) and RF transceiver (1.8V) from single AA/AAA cell with tight space constraints. IC Role / Device Role / Timing Role: Dual synchronous boost converter providing isolated, regulated outputs with independent enable control and fast load transient response. Use Value: 94% peak efficiency and 12μA Burst Mode IQ extend battery life beyond 100 hours; active VOUT discharge ensures zero residual voltage during sleep mode. |
Use Scenario: Compact USB-rechargeable mouse requiring 3.3V for MCU and 1.8V for optical sensor from single NiMH cell. IC Role / Device Role / Timing Role: Dual-channel step-up regulator with in-phase switching and integrated anti-ringing to minimize EMI near sensitive optical components. Use Value: 1.2MHz operation enables small 2.2μH inductors; true output disconnect prevents battery drain when mouse is idle for weeks. |
| Portable Medical Sensors | MP3/Personal Media Players |
Use Scenario: Low-noise power for analog front-end (2.5V) and digital core (3.3V) in handheld pulse oximeter powered by coin cell. IC Role / Device Role / Timing Role: Ultra-low-IQ dual boost converter with <2μA shutdown current and precise 1.20V reference for stable sensor biasing. Use Value: 700mV startup enables use of exhausted coin cells; PGOOD outputs enable firmware-controlled power sequencing and fault detection. |
Use Scenario: Dual-output power for audio DAC (3.3V) and display backlight (5V) from two-series alkaline cells in pocket-sized media player. IC Role / Device Role / Timing Role: Synchronous boost IC supporting VIN > VOUT operation (e.g., 3V input → 5V output) with thermal protection during sustained playback. Use Value: 2.2MHz switching reduces inductor size for slim form factor; thermal shutdown (160°C) protects against overheating during extended use. |
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 |
|---|---|---|---|
| TPS61088RHLR | Single-channel, 5A switch current, no active VOUT discharge; 2.7–5.5V input; fixed 500kHz/2MHz options. | Lacks dual independent outputs and active discharge - requires external circuitry for multi-rail or rapid shutdown discharge. | Select when higher output current (>400mA CH2) is needed and dual-channel independence is not required. |
| MAX17222ETA+ | Single-channel, 500mA, 1.8–5.5V input, 1.4–5.25V output; 1.2μA shutdown IQ; no PGOOD or FSEL. | No dual output, no frequency select, no power-good signaling - simpler but less configurable for complex portable systems. | Choose for cost-sensitive, single-rail applications where footprint and BOM count are prioritized over flexibility. |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3527EUD-1#PBF uniquely delivers dual independent boost channels with active VOUT discharge, true output disconnect, and selectable 1.2/2.2MHz operation - making it optimal for space-constrained, multi-rail portable electronics requiring long battery life and robust power sequencing.
Availability
LTC3527EUD-1#PBF is available at Aetrix Electronics and suitable for noise-canceling headsets, wireless mice, portable medical sensors, MP3 players, and other battery-powered consumer electronics requiring stable component supply and long-term lifecycle support.
Supply support for LTC3527EUD-1#PBF 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-1#PBF belongs to Linear's precision power conversion portfolio, designed specifically for ultra-low-power portable applications demanding dual regulated outputs from single- or dual-cell batteries.
FAQ
What is the key functional difference between LTC3527EUD-1#PBF and LTC3527EUD#PBF?
The LTC3527EUD-1#PBF provides active VOUT1/VOUT2 discharge when SHDN1/SHDN2 go low, pulling outputs to ground during shutdown. The standard LTC3527EUD#PBF lacks this feature and relies on passive discharge through load resistance. This makes LTC3527EUD-1#PBF essential for applications requiring rapid power-state transitions or zero residual output voltage - such as Bluetooth headset mute/unmute cycles or medical sensor calibration sequences.
Can LTC3527EUD-1#PBF operate with input voltage higher than output voltage?
Yes, LTC3527EUD-1#PBF supports VIN > VOUT operation for both channels when all VIN pins (VIN, VIN1, VIN2) are tied together. In this mode, regulation is maintained but efficiency decreases due to increased power dissipation; output current must be derated to keep junction temperature below 125°C using the formula POUT ≤ (125°C − TA) / 68°C/W. This capability enables flexible system-level power routing without external regulators.
What is the minimum startup voltage for LTC3527EUD-1#PBF, and how does it behave below that threshold?
The LTC3527EUD-1#PBF has a typical startup voltage of 700mV and can operate down to 500mV once started. Below 700mV, the internal startup oscillator remains inactive and the device stays in reset. Once started, it sustains regulation even as input sags - critical for alkaline/NiMH cells nearing end-of-life. If VIN drops below ~0.5V, regulation fails and outputs collapse, but the IC remains latched in operational state until full shutdown.
How does Burst Mode operation work in LTC3527EUD-1#PBF, and what triggers exit from it?
In LTC3527EUD-1#PBF, Burst Mode activates automatically when load current falls below the threshold (e.g., ~1–5mA depending on VIN/VOUT), reducing quiescent current to 12μA. Energy bursts are delivered at fixed 1.2/2.2MHz until VOUT reaches regulation, then the IC sleeps. Exit occurs when either VOUT droops >1% or load increases beyond the burst threshold - with seamless transition back to PWM due to shared oscillator and internal compensation. Both channels must be enabled for Burst Mode to engage.
What are the thermal management requirements for LTC3527EUD-1#PBF in a 3mm×3mm QFN package?
The LTC3527EUD-1#PBF uses an exposed PGND pad (Pin 17) that must be soldered to a minimum 100mm² copper area on the PCB for effective heat dissipation. With θJA = 68°C/W, continuous 800mA output at 3.3V from 1.2V input can raise die temperature by ~45°C above ambient. Thermal shutdown triggers at 160°C; design margin requires ensuring TJ ≤ 125°C under worst-case load/ambient conditions using the provided derating equations and proper layout.
LTC3527EUD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- 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-1#PBF FAQ
1.How can I place an order for LTC3527EUD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3527EUD-1#PBF 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-1#PBF reliable?
The price and inventory of LTC3527EUD-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3527EUD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3527EUD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3527EUD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3527EUD-1#PBF?
LTC3527EUD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3527EUD-1#PBF 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-1#PBF?
For technical support, including LTC3527EUD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3527EUD-1#PBF requirements.
6.How does Aetrix verify that LTC3527EUD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3527EUD-1#PBF 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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3527EUD-1#PBF?
All LTC3527EUD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3527EUD-1#PBF, 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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3527EUD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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