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Analog Devices Inc. LTC3527EUD#PBF
- Part No.:
- LTC3527EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3527EUD#PBF.pdf
- Description:
- IC REG BOOST ADJ DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:248
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Product details
Overview
LTC3527EUD#PBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-up DC/DC converter IC with independent 800mA and 400mA output channels, operating at selectable 1.2MHz or 2.2MHz switching frequencies in a 3mm × 3mm QFN-16 package. It starts up from as low as 0.7V input and delivers regulated 1.6V–5.25V outputs-e.g., 3.3V at 200mA/100mA from one alkaline/NiMH cell-targeting space-constrained portable power rails.
For engineers reviewing the LTC3527EUD#PBF datasheet, LTC3527EUD#PBF pinout, LTC3527EUD#PBF application, or LTC3527EUD#PBF equivalent, key selection considerations include its dual-channel burst-mode efficiency (<12μA quiescent), true output disconnect in shutdown, inrush-limited soft-start, and FSEL/MODE-configurable frequency and operation mode.
Technical Context
The LTC3527EUD#PBF integrates two current-mode PWM boost converters sharing a single oscillator for in-phase switching, each with independent VIN, SHDN, FB, PGOOD, and SW pins but common MODE and FSEL controls. Its adaptive slope compensation ensures stable transient response across wide load and input ranges.
It employs internal NMOS power switches (0.30Ω/0.50Ω) and PMOS synchronous rectifiers (0.40Ω/0.60Ω), enabling high efficiency up to 94% while supporting VIN > VOUT operation and thermal shutdown at 160°C. Burst Mode® activation is automatic below load thresholds dependent on VIN and VOUT, with fixed-frequency PWM resuming above those thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 800mA (CH1), 400mA (CH2); enables dual-rail powering of core + I/O or RF + baseband subsystems |
| Startup Voltage | 0.7V (typ); allows direct use with single depleted alkaline/NiMH cells without pre-bias |
| Input Voltage Range | 0.5V–5V after startup; supports deep discharge battery operation and VIN > VOUT pass-through |
| Output Voltage Range | 1.6V–5.25V per channel; programmable via external resistor dividers for flexible rail generation |
| Switching Frequency | 1.2MHz (FSEL = low) or 2.2MHz (FSEL = high); trade-off between efficiency and solution size |
| Quiescent Current | 12μA in Burst Mode; extends battery life in standby without compromising wake-up speed |
| Efficiency | Up to 94%; achieved via synchronous rectification and low RDS(ON) MOSFETs |
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; <2μA shutdown current |
| FB1 (2) | Channel 1 feedback input | Connects to resistor divider tap; regulates VOUT1 to 1.20V reference (±2.4% over temp) |
| MODE (3) | Operation mode select | Low = Burst Mode (high light-load efficiency); High = fixed-frequency PWM (low ripple) |
| VIN1 (4) | Channel 1 input supply | Independent battery/supply input for CH1; supports VIN down to 0.5V during operation |
| VOUT1 (5) | Channel 1 output sense & bias | Sense node and driver bias source; enables true output disconnect when SHDN1 = low |
| SW1 (6) | Channel 1 switch node | Connects to inductor; includes internal 100Ω anti-ringing switch to suppress EMI in DCM |
| SW2 (7) | Channel 2 switch node | Same function as SW1 for CH2; independent inductor connection required |
| VOUT2 (8) | Channel 2 output sense & bias | Same function as VOUT1 for CH2; supports independent regulation and disconnect |
| VIN2 (9) | Channel 2 input supply | Independent input for CH2; must be wired to higher of VIN1/VIN2 if supplies differ |
| FSEL (10) | Frequency select | Low = 1.2MHz; High = 2.2MHz; sets oscillator frequency for both channels |
| FB2 (11) | Channel 2 feedback input | Same function as FB1 for CH2; regulates VOUT2 independently |
| SHDN2 (12) | Channel 2 shutdown control | Same function as SHDN1 for CH2; both must be low for full <2μA shutdown |
| PGOOD2 (13) | Channel 2 power-good flag | Open-drain output low when VFB2 is >9% below regulation; used for sequencing |
| GND (14) | Signal ground reference | Reference for internal circuitry; separate from PGND (exposed pad) |
| VIN (15) | Common input supply | Third VIN pin; must connect to highest of VIN1/VIN2; bypass capacitor required |
| PGOOD1 (16) | Channel 1 power-good flag | Same function as PGOOD2 for CH1; enables independent power sequencing |
| PGND (17) | Power ground / thermal pad | Exposed pad; must be soldered to PCB ground plane for thermal dissipation and low-impedance return |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates body diode conduction in shutdown, allowing VOUT1/VOUT2 to fully discharge to 0V and preventing reverse current into battery |
| Independent soft-start & inrush limiting | Ramps peak inductor current to 900mA (CH1) or 500mA (CH2) over ~0.5ms, enabling safe start into heavy capacitive loads |
| Anti-ring circuitry | Internal 100Ω switch connects SWx to VINx during discontinuous conduction, suppressing high-frequency ringing and reducing EMI |
| Thermal shutdown | Disables all switches at ~160°C junction temperature; resumes operation after ~15°C cooldown, protecting against sustained overload |
| Zero-current detection | Shuts off synchronous rectifiers when inductor current drops to ~30mA, preventing reverse current and improving light-load efficiency |
Applications
| MP3/Personal Media Players | Noise-Canceling/Bluetooth Headsets |
|---|---|
Use Scenario: Powering audio DAC, codec, and Bluetooth radio from a single AA/AAA cell with tight board area constraints. IC Role / Device Role / Timing Role: Dual-channel boost converter generating 3.3V for digital logic and 1.8V for RF/analog sections simultaneously. Use Value: 94% peak efficiency and 12μA Burst Mode quiescent current extend playback time; 3mm × 3mm QFN minimizes footprint. |
Use Scenario: Supplying noise-sensitive analog front-end and low-power Bluetooth SoC in compact earbud form factor. IC Role / Device Role / Timing Role: Independent regulation of 3.3V (RF transceiver) and 1.8V (ADC/DAC) with precise PGOOD sequencing. Use Value: True output disconnect prevents battery drain during sleep; anti-ring circuitry reduces EMI coupling into audio path. |
| Wireless Mice | Portable Medical Instruments |
Use Scenario: Delivering stable 3.3V and 1.8V rails from coin-cell or alkaline battery in ultra-low-power human-interface device. IC Role / Device Role / Timing Role: Dual synchronous boost with 0.7V startup enabling operation until battery depletion near 0.5V. Use Value: Inrush-limited soft-start avoids brownout during wake-from-sleep; <2μA shutdown current preserves shelf life. |
Use Scenario: Powering precision sensor signal chain and microcontroller in handheld diagnostic tool with strict battery life requirements. IC Role / Device Role / Timing Role: Generating isolated, low-noise 5V (for op-amps) and 3.3V (for MCU) from single-cell source. Use Value: Fixed-frequency PWM mode provides low-output-ripple power for analog circuits; thermal shutdown ensures safety 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 |
|---|---|---|---|
| TPS63020DSJR | Single-inductor dual-output (buck-boost), 2A total output, 2.5V–5.5V input, no true output disconnect | Better suited for systems needing VIN > VOUT capability and higher current; less ideal for ultra-low-VIN startup | Select when input voltage may exceed outputs and higher combined current is needed; avoid when true shutdown isolation is critical |
| MAX8642AETE+ | Dual independent boost, 600mA/400mA, 0.9V–5.5V input, 1.25V–5.5V output, 2.25MHz fixed frequency only | Higher minimum input (0.9V vs 0.7V), no Burst Mode, smaller package (3mm × 3mm TQFN), no FSEL flexibility | Choose for simpler fixed-frequency designs where 0.7V startup is unnecessary and layout space is extremely constrained |
Compared with TPS63020DSJR and MAX8642AETE+, the LTC3527EUD#PBF uniquely combines sub-0.8V startup, true output disconnect, and user-selectable 1.2/2.2MHz operation-making it optimal for single-cell portable devices demanding maximum battery utilization and clean shutdown behavior.
Availability
LTC3527EUD#PBF is available at Aetrix Electronics and suitable for MP3 players, Bluetooth headsets, wireless mice, portable medical instruments, and other battery-powered consumer and industrial electronics requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3527EUD#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 and maintains its legacy of high-performance analog, power management, and mixed-signal ICs with rigorous reliability standards and comprehensive technical support.
The LTC3527EUD#PBF belongs to Linear's high-efficiency DC/DC converter product line, designed specifically for ultra-low-voltage, dual-rail portable power applications where battery life, small footprint, and robust protection features are critical.
FAQ
What is the minimum input voltage required to start up the LTC3527EUD#PBF?
The LTC3527EUD#PBF has a typical startup voltage of 0.7V and guarantees operation down to 0.5V once started. This enables direct interfacing with deeply discharged single alkaline or NiMH cells. Startup is supported by an independent oscillator and internal charge pump, and both channels can be sequenced using SHDN1 and SHDN2. The LTC3527EUD#PBF achieves this without external bias components.
Does the LTC3527EUD#PBF support true output disconnect during shutdown?
Yes, the LTC3527EUD#PBF provides true output disconnect by eliminating body diode conduction in its internal P-channel synchronous rectifiers. When SHDN1 or SHDN2 is pulled low, the respective VOUT1 or VOUT2 is fully isolated from VIN and discharges to 0V-preventing reverse current into the battery and enabling clean system-level power gating. This feature requires no external Schottky diodes.
How does the MODE pin affect the operation of the LTC3527EUD#PBF?
The MODE pin selects between Burst Mode® operation (MODE = low) for maximum light-load efficiency (<12μA quiescent current) and fixed-frequency PWM (MODE = high) for low-output-ripple performance. Burst Mode automatically transitions to PWM when load increases past a threshold dependent on VIN and VOUT. The LTC3527EUD#PBF maintains the same error amplifier and loop compensation in both modes to eliminate output transients during mode switching.
Can the LTC3527EUD#PBF operate with input voltage higher than the output voltage?
Yes, the LTC3527EUD#PBF supports VIN > VOUT operation for both channels, provided all VIN pins (VIN, VIN1, VIN2) are tied together. In this mode, regulation is maintained but efficiency decreases and power dissipation rises. Output current is thermally limited to keep junction temperature ≤125°C; the LTC3527EUD#PBF incorporates thermal shutdown at ~160°C as a secondary safeguard.
What is the purpose of the exposed pad (Pin 17) on the LTC3527EUD#PBF?
The exposed pad (Pin 17) is PGND-the power ground connection for both VOUT1 and VOUT2-and serves as the primary thermal dissipation path. It must be soldered to a large PCB copper area connected to the system ground plane. Failure to do so risks thermal overload and reduced current capability. The LTC3527EUD#PBF datasheet specifies θJA = 68°C/W with proper pad soldering, confirming its critical role in thermal management.
LTC3527EUD#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#PBF FAQ
1.How can I place an order for LTC3527EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3527EUD#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#PBF reliable?
The price and inventory of LTC3527EUD#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3527EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3527EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3527EUD#PBF?
LTC3527EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3527EUD#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#PBF?
For technical support, including LTC3527EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3527EUD#PBF requirements.
6.How does Aetrix verify that LTC3527EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3527EUD#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3527EUD#PBF?
All LTC3527EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3527EUD#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#PBF part is unused and in its original packaging.
Return procedure for LTC3527EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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