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Analog Devices Inc. LTC3535EDD#TRPBF
- Part No.:
- LTC3535EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3535EDD#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 550MA DL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,283
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Product details
Overview
LTC3535EDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous, fixed-frequency step-up DC/DC converter with output disconnect and independent shutdown control per channel. It delivers up to 550mA per channel at 1MHz switching frequency, starts from 680mV input, operates down to 500mV, and supports adjustable output voltages from 1.5V to 5.25V - enabling single AA/AAA battery-powered medical instruments and noise-canceling headphones.
For engineers reviewing the LTC3535EDD#TRPBF datasheet, LTC3535EDD#TRPBF pinout, LTC3535EDD#TRPBF application, or LTC3535EDD#TRPBF equivalent, key selection criteria include guaranteed 680mV start-up voltage, 9µA per-channel quiescent current in Burst Mode, integrated soft-start and internal compensation, anti-ring control for EMI reduction, and true output disconnect during shutdown.
Technical Context
The LTC3535EDD#TRPBF implements two fully independent current-mode PWM boost regulators, each with a dedicated 1MHz oscillator, adaptive slope compensation, and internal transconductance error amplifiers referenced to 1.195V. Each channel features lossless peak-current sensing, zero-current detection (~30mA), and independent UVLO with start-up oscillator activation below 0.68V.
Its architecture integrates N-channel MOSFET switches (0.4Ω typical RDS(ON)) and P-channel synchronous rectifiers (0.6Ω typical RDS(ON)), enabling VIN-to-VOUT operation even when VIN > VOUT. Output disconnect is achieved by eliminating body-diode conduction via controlled gate drive sequencing, requiring no external Schottky diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1MHz fixed - enables use of compact 4.7µH inductors and ceramic capacitors, minimizing solution footprint. |
| Start-Up Input Voltage | 680mV typical - allows reliable startup from partially discharged alkaline/NiMH cells. |
| Operating Input Range | 0.5V to 5V after startup - supports ultra-low-voltage operation under light load with duty cycle clamped to 90%. |
| Output Voltage Range | 1.5V to 5.25V adjustable via FB divider - accommodates 3.3V logic rails and 5V peripherals from single-cell sources. |
| Quiescent Current (Burst Mode) | 9µA per channel - sustains >2-year battery life in always-on sensor nodes with intermittent wakeups. |
| Peak Switch Current Limit | 750mA typical per channel - defines maximum deliverable output current under low-VIN conditions. |
| Efficiency | Up to 94% at 100mA - achieved via synchronous rectification and low RDS(ON) MOSFETs. |
| Shutdown Current | <1µA total - ensures negligible battery drain during system sleep states. |
Pinout & Package
The LTC3535EDD#TRPBF is housed in a 12-lead, 3mm × 3mm × 0.75mm plastic DFN package with exposed thermal pad (Pin 13) that must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT1 (Pin 1) | Channel 1 output sense & synchronous rectifier drain | Connects directly to output capacitor; enables true output disconnect during shutdown - no reverse current into VIN1. |
| SW1 (Pin 2) | Channel 1 power switch node | Drives external inductor; internal anti-ringing switch connects SW1 to VIN1 in discontinuous mode to suppress EMI. |
| GND (Pins 3, 6, 13) | Signal and power ground | Pins 3 and 6 are signal GND; Pin 13 is exposed thermal pad - all must connect to low-impedance PCB ground plane. |
| VOUT2 (Pin 4) | Channel 2 output sense & synchronous rectifier drain | Independent of Channel 1; supports separate output rails or paralleled outputs (non-current-sharing). |
| SW2 (Pin 5) | Channel 2 power switch node | Functionally identical to SW1; requires symmetric layout for EMI control across both channels. |
| VIN2 (Pin 7) | Channel 2 input supply | Accepts 0.5V–5V; decoupled with ≥1µF ceramic capacitor placed adjacent to pin. |
| SHDN2 (Pin 8) | Channel 2 logic-controlled shutdown | Internal 4MΩ pull-down; drives low <0.3V to enter shutdown (<1µA IQ); high >0.8V for normal operation. |
| FB2 (Pin 9) | Channel 2 feedback input | Connects to resistor divider; regulates VOUT2 = 1.195V × (1 + R4/R3); input bias current ≤50nA. |
| VIN1 (Pin 10) | Channel 1 input supply | Independent input path; supports dual-battery or split-rail configurations without cross-talk. |
| SHDN1 (Pin 11) | Channel 1 logic-controlled shutdown | Functionally identical to SHDN2; enables independent power gating per channel. |
| FB1 (Pin 12) | Channel 1 feedback input | Regulates VOUT1 identically to FB2; allows independent output voltage programming per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 9µA per channel at light loads while maintaining 1MHz fixed-frequency control - eliminates mode-switching transients. |
| Output disconnect | Prevents reverse current flow through internal P-channel rectifier body diode during shutdown - enables zero-VOUT hold and safe hot-swap capability. |
| Anti-ring control | Internally damps SW-node ringing in discontinuous conduction mode using a switched resistor - lowers radiated EMI without external components. |
| Integrated soft-start | Ramps peak inductor current from 0 to 750mA over ~0.5ms - prevents inrush into heavy capacitive loads without external timing components. |
| Internal loop compensation | Eliminates need for external compensation network - simplifies design and improves stability across 4.7µF–10µF output capacitor range. |
| Low-voltage start-up oscillator | Activates independently per channel below 0.68V - enables operation from deeply discharged primary cells where conventional boosters fail. |
Applications
| Medical Instruments | Noise Canceling Headphones |
|---|---|
|
Use Scenario: Portable glucose meters and pulse oximeters powered by single AAA batteries with multi-year shelf life requirements. IC Role / Device Role / Timing Role: Dual-channel boost regulator supplying 3.3V to MCU and 1.8V to analog front-end sensors - each channel independently managed for power sequencing. Use Value: 680mV start-up and 9µA Burst Mode IQ extend usable battery life beyond 36 months in standby, validated per IEC 62304 Class B software safety requirements. |
Use Scenario: Battery-powered active noise cancellation (ANC) earbuds requiring isolated 3.3V digital and 1.8V analog rails from a single 1.2V NiMH cell. IC Role / Device Role / Timing Role: Independent boost channels powering DSP core and MEMS microphone preamp - no shared ground noise coupling between domains. Use Value: True output disconnect prevents battery drain during ANC off-state; anti-ring control meets FCC Part 15 Class B conducted EMI limits without ferrite beads. |
| Energy Harvesting | Bluetooth Headsets |
|
Use Scenario: Indoor light-harvesting nodes using amorphous silicon photodiodes generating 0.6–1.0V open-circuit voltage under ambient lighting. IC Role / Device Role / Timing Role: Primary power conversion stage stepping harvested voltage to stable 3.3V for BLE SoC and EEPROM - operating continuously at sub-100µA loads. Use Value: 500mV minimum operating voltage and 94% peak efficiency at 50µA enable functional operation under dim lighting where competing converters drop out. |
Use Scenario: Compact mono Bluetooth headsets with space-constrained PCBs and tight thermal budgets. IC Role / Device Role / Timing Role: Single-chip dual-rail solution replacing two discrete boost ICs - reduces component count by 35% and board area by 42%. Use Value: 3mm × 3mm DFN package with exposed thermal pad maintains junction temperature <85°C at full 200mA load, eliminating need for thermal vias or heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610992RTER | Single-channel, 1.2MHz, 400mA max, 500mV start-up, no output disconnect | Lacks independent dual-rail capability and true output disconnect - requires external MOSFET for shutdown isolation | Select only if single-output requirement and lower cost outweigh need for dual independent channels. |
| MAX77818EWL+T | Dual-channel, 2MHz, 1A per channel, 700mV start-up, integrated fuel gauge, I²C programmable | Higher integration adds complexity and cost; 2MHz switching increases EMI sensitivity and inductor losses at low VIN | Prefer when system-level telemetry (battery voltage/current/temp) is required alongside regulation - not for minimal-footprint, ultra-low-IQ designs. |
Compared with LTC3535EDD#TRPBF, TPS610992RTER sacrifices dual-channel independence and output disconnect for lower unit cost, while MAX77818EWL+T trades off simplicity and ultra-low-light-load efficiency for programmability and telemetry - making LTC3535EDD#TRPBF optimal for space-constrained, long-life, dual-rail battery systems.
Availability
LTC3535EDD#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, noise-canceling audio devices, energy harvesting nodes, and Bluetooth headsets requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3535EDD#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 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3535EDD#TRPBF belongs to Linear's precision low-voltage DC/DC converter product line, designed specifically for extending battery life in single-cell portable electronics where start-up voltage, light-load efficiency, and output isolation are critical.
FAQ
What is the minimum input voltage required for LTC3535EDD#TRPBF to start up?
The LTC3535EDD#TRPBF guarantees startup at 680mV input voltage per channel, with typical operation down to 500mV once running. This is enabled by an independent start-up oscillator and adaptive UVLO circuitry - allowing reliable initialization from nearly depleted alkaline or NiMH cells where other boost converters fail to activate.
Does LTC3535EDD#TRPBF support output voltages higher than the input voltage?
Yes, the LTC3535EDD#TRPBF is a step-up converter designed to generate regulated output voltages from 1.5V to 5.25V regardless of input level - including cases where VIN exceeds VOUT. However, efficiency drops significantly in VIN > VOUT mode due to reduced duty cycle utilization and increased conduction losses in the synchronous rectifier.
How does the output disconnect feature work in LTC3535EDD#TRPBF?
The LTC3535EDD#TRPBF achieves true output disconnect by actively controlling the gate of its internal P-channel synchronous rectifier to prevent body-diode conduction during shutdown. When SHDN1 or SHDN2 is pulled low, VOUT1 or VOUT2 falls to 0V with no reverse current into VIN - eliminating battery drain and enabling safe hot-swap of power sources without external circuitry.
Can both channels of LTC3535EDD#TRPBF operate from different input sources?
Yes, LTC3535EDD#TRPBF supports fully independent operation: VIN1 and VIN2 may be connected to separate batteries, energy harvesters, or power rails. Each channel has dedicated SHDN, FB, and SW pins - enabling asymmetric power management, such as keeping one rail active for RTC while shutting down the other for system sleep.
What is the purpose of the exposed thermal pad (Pin 13) on LTC3535EDD#TRPBF?
The exposed thermal pad (Pin 13) on LTC3535EDD#TRPBF serves as both a low-thermal-resistance heat path (θJC(PAD) = 3°C/W) and a mandatory signal ground connection. It must be soldered to a solid PCB ground plane; failure to do so raises junction temperature by >40°C and risks thermal shutdown under sustained 200mA loads per channel.
LTC3535EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN 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):
- 0.5V
- 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:
- 12-DFN (3x3)
LTC3535EDD#TRPBF FAQ
1.How can I place an order for LTC3535EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3535EDD#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 LTC3535EDD#TRPBF reliable?
The price and inventory of LTC3535EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3535EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3535EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3535EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3535EDD#TRPBF?
LTC3535EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3535EDD#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 LTC3535EDD#TRPBF?
For technical support, including LTC3535EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3535EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3535EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3535EDD#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 LTC3535EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3535EDD#TRPBF?
All LTC3535EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3535EDD#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 LTC3535EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3535EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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