My Inquiry
My Account
Analog Devices Inc. LTC3535EDD#PBF
- Part No.:
- LTC3535EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3535EDD#PBF.pdf
- Description:
- IC REG BOOST ADJ 550MA DL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:186
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3535EDD#PBF 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#PBF datasheet, LTC3535EDD#PBF pinout, LTC3535EDD#PBF application, or LTC3535EDD#PBF equivalent, key selection criteria include guaranteed 680mV start-up voltage, dual independent 1MHz boost channels with Burst Mode® (9µA IQ per channel), internal synchronous rectification, output disconnect, and thermal shutdown in a 12-lead 3mm × 3mm DFN package.
Technical Context
The LTC3535EDD#PBF implements current-mode PWM control with internal slope compensation and adaptive zero-current detection to enable fast transient response and stable operation across wide input/output ranges. Each channel features independent start-up oscillators, dedicated error amplifiers with 1.195V reference, and anti-ring circuitry that damps SW-pin ringing during discontinuous conduction mode.
It supports VIN > VOUT operation with clamped 90% maximum duty cycle, integrates soft-start (0.5ms ramp), and uses internal N-channel MOSFET switches (0.4Ω RDS(ON)) with P-channel synchronous rectifiers (0.6Ω RDS(ON)). Shutdown is logic-controlled with <1µA quiescent current and internal 4MΩ pull-down on SHDN pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-Up Input Voltage | 680mV typical - enables reliable startup from single alkaline/NiMH cells at end-of-life. |
| Switching Frequency | 1MHz fixed - allows use of compact 4.7µH inductors and ceramic capacitors for minimal footprint. |
| Output Voltage Range | 1.5V to 5.25V - programmable via external resistor divider on FB1/FB2 pins. |
| Peak Switch Current Limit | 550mA minimum per channel - sets maximum deliverable load current under regulation. |
| Quiescent Current (Burst Mode) | 9µA per channel - sustains ultra-low power operation in energy harvesting and standby modes. |
| Efficiency | Up to 94% - achieved via synchronous rectification and low RDS(ON) MOSFETs, critical for battery runtime extension. |
| Shutdown Current | <1µA - ensures negligible battery drain during system sleep or storage. |
Pinout & Package
The LTC3535EDD#PBF 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 plane for thermal management (θJC = 3°C/W).
| 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 and prevents reverse current into VIN1. |
| SW1 (Pin 2) | Channel 1 switch node | Drives external inductor; internal anti-ringing switch connects SW1 to VIN1 when current falls to zero or SHDN1 is low. |
| GND (Pins 3, 6, 13) | Signal and power ground | Multiple GND connections plus exposed pad ensure low-impedance return path and effective heat dissipation. |
| VOUT2 (Pin 4) | Channel 2 output sense & synchronous rectifier drain | Independent of Channel 1; supports separate or tied outputs with no current sharing. |
| SW2 (Pin 5) | Channel 2 switch node | Functionally identical to SW1; requires short, wide PCB trace to minimize EMI. |
| VIN2 (Pin 7) | Channel 2 input supply | Accepts 0.5V–5V; decoupled with ≥1µF ceramic capacitor to suppress high-frequency noise. |
| SHDN2 (Pin 8) | Channel 2 shutdown control | Logic-high enables operation; internal 4MΩ pull-down ensures default shutdown if left floating. |
| FB2 (Pin 9) | Channel 2 feedback input | Sets regulated output via resistor divider; reference voltage is 1.195V ±30mV over temperature. |
| VIN1 (Pin 10) | Channel 1 input supply | Independent input source; supports dual-battery or redundant power architectures. |
| SHDN1 (Pin 11) | Channel 1 shutdown control | Enables per-channel power gating for dynamic system-level power management. |
| FB1 (Pin 12) | Channel 1 feedback input | Identical function to FB2; allows independent output voltage programming per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 9µA per-channel quiescent current at light loads while preserving 1MHz fixed-frequency control architecture for seamless mode transitions. |
| Output disconnect | Eliminates body-diode conduction in P-channel rectifier, allowing VOUT to fall to 0V during shutdown and preventing reverse current into battery sources. |
| Low-voltage start-up | Guaranteed 680mV start-up with independent oscillator enables operation from depleted single-cell batteries without external charge pumps. |
| Integrated soft-start | Ramps peak inductor current from 0 to 750mA in ~0.5ms, preventing inrush surges into heavy capacitive loads during power-on. |
| Anti-ring control | Internal switch damps SW-pin resonance during discontinuous conduction, reducing EMI without external snubbers. |
Applications
| Medical Instruments | Noise Canceling Headphones |
|---|---|
|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single AAA batteries with tight space constraints. IC Role / Device Role / Timing Role: Dual independent boost regulator supplying 3.3V to microcontroller and 1.8V to analog front-end sensors. Use Value: 680mV start-up extends usable battery life by >30% compared to conventional boost ICs, while output disconnect prevents battery drain during measurement idle periods. |
Use Scenario: Battery-powered active noise cancellation (ANC) earbuds requiring separate clean supplies for DSP and analog audio stages. IC Role / Device Role / Timing Role: One channel powers 3.3V digital core; second channel delivers regulated 1.8V to low-noise op-amps and ADCs. Use Value: Independent Burst Mode per channel reduces total system IQ to <20µA during ANC standby, enabling multi-week shelf life. |
| Energy Harvesting | Bluetooth Headsets |
|
Use Scenario: Indoor light-harvesting nodes using amorphous silicon photodiodes generating sub-1V open-circuit voltage. IC Role / Device Role / Timing Role: Primary voltage booster converting 0.6–0.9V harvested input to stable 3.3V for ultra-low-power MCU and BLE radio. Use Value: 500mV operational floor and 9µA Burst Mode IQ allow continuous operation even under dim ambient lighting conditions. |
Use Scenario: Compact mono/stereo Bluetooth headsets with dual Li-ion coin cells or single alkaline cell powering RF and audio subsystems. IC Role / Device Role / Timing Role: Dual-channel conversion delivering 3.3V to Bluetooth SoC and 2.5V to MEMS microphone bias circuit. Use Value: 1MHz switching minimizes inductor size (4.7µH, 0805), enabling full solution within 12mm × 12mm PCB area. |
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 |
|---|---|---|---|
| TPS610992RTER | Single-channel, 1.2MHz, 400mA max, 600mV start-up, no output disconnect | Lacks independent dual outputs and true output disconnect; requires two devices for dual-rail designs | Choose only if dual-channel integration is unnecessary and board area permits two ICs. |
| MAX77831AEWJ+T | Dual-channel, 2.5MHz, 1A per channel, 700mV start-up, integrated battery charger | Includes linear charger but lacks Burst Mode IQ & anti-ring control; larger 16-pin WLP package | Prefer when battery charging capability is required alongside boosting; avoid if ultra-low IQ or EMI-sensitive audio is critical. |
Compared with LTC3535EDD#PBF, TPS610992RTER offers higher frequency but sacrifices dual-channel integration and output disconnect, while MAX77831AEWJ+T adds charging functionality at the cost of higher quiescent current and reduced EMI control - making LTC3535EDD#PBF optimal for space-constrained, ultra-low-power dual-rail systems without charging needs.
Availability
LTC3535EDD#PBF is available at Aetrix Electronics and suitable for medical instrumentation, noise-canceling audio devices, energy harvesting nodes, Bluetooth headsets, and portable industrial sensors requiring stable component supply with long-term lifecycle support.
Supply support for LTC3535EDD#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 precision analog and power management product lines with full technical documentation and long-term manufacturing commitment.
The LTC3535EDD#PBF belongs to Linear's high-efficiency, low-voltage DC/DC converter family designed specifically for single-cell battery-powered portable electronics where extended runtime, small solution size, and robust light-load efficiency are critical.
FAQ
What is the minimum input voltage required for LTC3535EDD#PBF to start up?
The LTC3535EDD#PBF has a guaranteed start-up input voltage of 680mV at 1mA load, with typical operation down to 500mV once started. This enables reliable power-up from deeply discharged single alkaline or NiMH cells. The start-up oscillator is independent per channel and activates before normal PWM operation begins. Designers must ensure PCB layout minimizes trace resistance to preserve this low-voltage capability in LTC3535EDD#PBF implementations.
Does LTC3535EDD#PBF support independent output voltage programming for each channel?
Yes, LTC3535EDD#PBF supports fully independent output voltage programming via separate FB1 and FB2 pins. Each feedback input references an internal 1.195V ±30mV bandgap, allowing adjustment from 1.5V to 5.25V using standard resistor dividers. The formula is VOUT = 1.195V × (1 + Rtop/Rbottom). Channels operate independently - one can regulate 3.3V while the other delivers 2.5V, with no interaction between their control loops or output disconnect functions in LTC3535EDD#PBF.
How does the output disconnect feature work in LTC3535EDD#PBF?
LTC3535EDD#PBF achieves true output disconnect by eliminating body-diode conduction in its internal P-channel synchronous rectifier. When SHDN1 or SHDN2 is pulled low, the rectifier gate is actively controlled to block reverse current flow, allowing VOUT1 or VOUT2 to fall to 0V without drawing current from VIN. This prevents battery drain during shutdown and enables safe VOUT pulling above VIN. To retain this feature, no external Schottky diode may be placed between SW and VOUT in LTC3535EDD#PBF designs.
What is the quiescent current of LTC3535EDD#PBF in Burst Mode operation?
In Burst Mode operation, LTC3535EDD#PBF draws just 9µA per channel from VOUT, measured with FB > 1.230V and light load conditions. This ultra-low IQ is achieved by cycling between brief 1MHz switching bursts and deep-sleep periods where all switching activity halts. Total system IQ drops to <20µA when both channels are in Burst Mode - critical for energy harvesting and multi-month standby in battery-powered LTC3535EDD#PBF applications.
Can LTC3535EDD#PBF operate with input voltage higher than output voltage?
Yes, LTC3535EDD#PBF supports VIN > VOUT operation, maintaining regulation even when input exceeds programmed output voltage. In this mode, the P-channel rectifier remains off and the N-channel switch operates in linear pass-through, resulting in lower efficiency and reduced maximum output current. The device clamps duty cycle at 90% typical and relies on internal current limiting (400mA short-circuit threshold) to prevent damage. This capability is documented in the LTC3535EDD#PBF datasheet under "VIN > VOUT Operation".
LTC3535EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN 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):
- 0.5V
- 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#PBF FAQ
1.How can I place an order for LTC3535EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3535EDD#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 LTC3535EDD#PBF reliable?
The price and inventory of LTC3535EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3535EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3535EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3535EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3535EDD#PBF?
LTC3535EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3535EDD#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 LTC3535EDD#PBF?
For technical support, including LTC3535EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3535EDD#PBF requirements.
6.How does Aetrix verify that LTC3535EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3535EDD#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 LTC3535EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3535EDD#PBF?
All LTC3535EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3535EDD#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 LTC3535EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3535EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3535EDD#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
