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Analog Devices Inc. LTC3531EDD-3.3#PBF
- Part No.:
- LTC3531EDD-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3531EDD-3.3#PBF.pdf
- Description:
- IC REG BUCK BST 3.32V 200MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:227
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Product details
Overview
LTC3531EDD-3.3#PBF from Analog Devices (formerly Linear Technology) is a synchronous buck-boost DC/DC converter IC designed for single-cell Li-Ion and multi-cell alkaline/nickel battery-powered systems. It delivers 200mA at 3.3V output from a 3.6V input, operates across 1.8V–5.5V input range, maintains ±1.5% output regulation over temperature, and achieves up to 90% peak efficiency in 4-switch mode.
For engineers reviewing the LTC3531EDD-3.3#PBF datasheet, LTC3531EDD-3.3#PBF pinout, LTC3531EDD-3.3#PBF application, or LTC3531EDD-3.3#PBF equivalent, key selection criteria include its seamless mode transition (buck/boost/4-switch), ultra-low 16μA quiescent current, integrated 0.5Ω NMOS and 0.5Ω/0.8Ω PMOS switches, output disconnect in shutdown, and fixed 3.3V output in 3mm × 3mm DFN package.
Technical Context
The LTC3531EDD-3.3#PBF implements a four-switch buck-boost topology with automatic mode detection based on VIN–VOUT differential, enabling continuous regulation when input is above, below, or equal to output. Its Burst Mode® operation eliminates external compensation and reduces sleep current to 16μA while maintaining tight output regulation via a 1.225V internal reference and 2% accurate comparator.
Internal gate drivers incorporate anticross-conduction logic to prevent shoot-through between complementary MOSFET pairs (A/B and C/D). The device integrates peak current limiting (365mA typ), thermal shutdown (~150°C), and precise SHDN threshold (0.4V low, 1.4V high) with 60mV hysteresis - all optimized for portable power management where input voltage varies widely across battery discharge curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full discharge of single-cell Li-Ion (3.1V–4.2V) and two-cell alkaline (1.8V–3.2V) |
| Output Voltage | Fixed 3.3V ±1.5% - factory-trimmed, no external feedback resistors required |
| Max Output Current | 200mA at 3.3V - achievable from 3.6V input in buck mode; derates to 125mA at 2.5V input in boost mode |
| Quiescent Current | 16μA typical - enables >1-year battery life in always-on sensor nodes with 200mAh coin cell |
| Efficiency | Up to 90% peak - measured at 100mA load, 3.6V input, 3.3V output in 4-switch mode |
| Shutdown Current | <1μA - ensures zero-load battery drain during system sleep states |
| Switch RDS(ON) | NMOS: 0.5Ω; PMOS A/D: 0.5Ω/0.8Ω - minimizes conduction loss across operating modes |
Pinout & Package
The LTC3531EDD-3.3#PBF is housed in an 8-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 9) soldered to PCB ground for thermal management. Pin 5 is NC (not connected) for fixed-output versions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 1) | Buck-boost switch node A/B connection | Connects inductor to internal NMOS A and PMOS B; requires low-inductance layout to minimize EMI |
| VIN (Pin 2) | Input supply rail | Accepts 1.8V–5.5V; requires ≥2.2μF ceramic capacitor placed adjacent to pin |
| GND (Pin 3) | Signal ground reference | Provides analog reference for control circuitry; separate from PGND in DFN package |
| SHDN (Pin 4) | Enable/disable control input | Logic-low (<0.4V) disables converter and activates output disconnect; hysteresis prevents chatter |
| FB (Pin 5) | Feedback input | No-connect for LTC3531EDD-3.3#PBF - internal resistor divider sets 3.3V output |
| VOUT (Pin 6) | Regulated output rail | Delivers 3.3V ±1.5%; requires 4.7μF–22μF ceramic capacitor directly to GND/PGND |
| PGND (Pin 8) | Power ground return | High-current return path for internal switches; must be tied to exposed pad and low-impedance ground plane |
| Exposed Pad (Pin 9) | Thermal and electrical ground | Must be soldered to PCB ground pour with ≥4 thermal vias to maintain TJ < 125°C at full load |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch buck-boost topology | Enables seamless regulation across VIN = VOUT ±800mV without mode discontinuities or output glitches |
| Burst Mode® operation | Eliminates need for external compensation components and reduces light-load IQ to 16μA |
| Output disconnect in shutdown | Opens both high-side PMOS switches to isolate VOUT from VIN, preventing battery drain through load |
| Integrated power MOSFETs | Two 0.5Ω NMOS + two PMOS (0.5Ω/0.8Ω) reduce BOM count and PCB area vs discrete FET solutions |
| Single-inductor architecture | Requires only one external inductor (10μH–22μH) and two ceramic capacitors - total solution size < 25mm² |
Applications
| Handheld Instruments | MP3 Players |
|---|---|
Use Scenario: Portable multimeter powered by two AA alkaline cells (1.8V–3.2V). IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable 3.3V to MCU, ADC, and display driver. Use Value: Maintains 3.3V output down to 1.8V input, extending usable battery life by 30% vs linear regulators. | Use Scenario: Flash-based audio player with Li-Ion battery (3.1V–4.2V). IC Role / Device Role / Timing Role: System power manager converting variable battery voltage to fixed 3.3V for DSP and memory interface. Use Value: 90% peak efficiency at 100mA load reduces thermal stress and enables thinner mechanical design. |
| PDA/GPS Receivers | USB-Powered Peripherals |
Use Scenario: GPS navigation unit operating from single-cell Li-Ion with aggressive duty cycling. IC Role / Device Role / Timing Role: Always-on power rail for real-time clock and GPS baseband processor during sleep intervals. Use Value: 16μA quiescent current enables >3-month standby time on 200mAh battery. | Use Scenario: USB-to-serial adapter drawing power from 4.35V–5.25V USB port. IC Role / Device Role / Timing Role: Input voltage translator providing regulated 3.3V to UART IC and level shifters. Use Value: Output disconnect prevents backfeed into USB host when peripheral is unpowered. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3440EDD-3.3#PBF | 2MHz switching frequency vs 1.2MHz typical; 600mA rated output vs 200mA; requires external compensation | Higher output current and frequency suit noise-sensitive RF modules but increase EMI filtering complexity | Select when >200mA load or tighter ripple specs demand higher switching frequency |
| TPS63020DSJR | 3.5V–12V input range; 3A output capability; integrated soft-start; no output disconnect in shutdown | Designed for higher-power industrial sensors; lacks true output disconnect, risking load leakage during sleep | Choose for 3A loads or wide-input industrial rails, but verify shutdown behavior matches system isolation requirements |
Compared with LTC3531EDD-3.3#PBF, LTC3440EDD-3.3#PBF offers higher current and frequency at the cost of increased external component count, while TPS63020DSJR provides industrial-grade current capability but sacrifices output disconnect - making LTC3531EDD-3.3#PBF optimal for space-constrained, battery-critical portable devices requiring zero-shutdown leakage.
Availability
LTC3531EDD-3.3#PBF is available at Aetrix Electronics and suitable for handheld instruments, MP3 players, PDA/GPS receivers, and USB-powered peripherals requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3531EDD-3.3#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3531EDD-3.3#PBF belongs to Linear's precision power management product line, engineered specifically for ultra-low-power portable electronics where input voltage varies across battery chemistries and discharge profiles.
FAQ
What is the minimum input voltage required for LTC3531EDD-3.3#PBF to start up?
The LTC3531EDD-3.3#PBF has a minimum startup voltage of 1.65V (typical) and guaranteed 1.8V across temperature. Below this threshold, the UVLO circuit prevents switching, ensuring reliable turn-on only when sufficient input energy is available to sustain regulation. This allows operation down to near-dead alkaline cells while avoiding unstable brown-out behavior.
Does LTC3531EDD-3.3#PBF support true output disconnect during shutdown?
Yes, LTC3531EDD-3.3#PBF provides true output disconnect by opening both high-side PMOS switches (A and D) when SHDN is pulled low. This isolates VOUT from VIN, allowing the output rail to discharge freely and eliminating reverse current flow - critical for preserving battery charge in always-off system states.
What is the recommended inductor value for LTC3531EDD-3.3#PBF in a typical 3.3V application?
A 10μH to 22μH shielded ferrite inductor with ≥500mA saturation current and <400mΩ DCR is recommended for LTC3531EDD-3.3#PBF. Murata LQH43CN100K03 (10μH, 650mA, 0.24Ω) is a validated choice that balances efficiency, size, and EMI performance across buck, boost, and 4-switch modes.
How does LTC3531EDD-3.3#PBF handle transitions between buck, boost, and 4-switch modes?
LTC3531EDD-3.3#PBF uses an internal VBEST comparator to continuously monitor VIN–VOUT differential. When |VIN – VOUT| < 400mV, it enters 4-switch mode; if VIN exceeds VOUT by ~800mV, it defaults to buck mode; if VIN falls ~400mV below VOUT, it engages boost mode - all transitions occur seamlessly without output disturbance or external intervention.
Is an external feedback resistor network required for LTC3531EDD-3.3#PBF?
No, LTC3531EDD-3.3#PBF is a fixed-output variant with internal resistor divider trimmed to 3.3V. Pin 5 (FB) is not connected internally and must be left floating or tied to GND - no external resistors are needed, reducing component count and layout complexity versus adjustable versions like LTC3531EDD#PBF.
LTC3531EDD-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.32V
- Voltage - Output (Max):
- -
- Current - Output:
- 200mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3531EDD-3.3#PBF FAQ
1.How can I place an order for LTC3531EDD-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3531EDD-3.3#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 LTC3531EDD-3.3#PBF reliable?
The price and inventory of LTC3531EDD-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3531EDD-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3531EDD-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3531EDD-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3531EDD-3.3#PBF?
LTC3531EDD-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3531EDD-3.3#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 LTC3531EDD-3.3#PBF?
For technical support, including LTC3531EDD-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3531EDD-3.3#PBF requirements.
6.How does Aetrix verify that LTC3531EDD-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3531EDD-3.3#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 LTC3531EDD-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3531EDD-3.3#PBF?
All LTC3531EDD-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3531EDD-3.3#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 LTC3531EDD-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC3531EDD-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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