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Analog Devices Inc. LTC3531ES6-3.3#TRMPBF
- Part No.:
- LTC3531ES6-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3531ES6-3.3#TRMPBF.pdf
- Description:
- IC REG BUCK BOOST 3.32V TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:16,017
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Product details
Overview
LTC3531ES6-3.3#TRMPBF 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, achieves up to 90% efficiency in Burst Mode, and features ultra-low 16μA quiescent current - enabling long runtime in handheld instruments and portable GPS devices.
For engineers reviewing the LTC3531ES6-3.3#TRMPBF datasheet, LTC3531ES6-3.3#TRMPBF pinout, LTC3531ES6-3.3#TRMPBF application, or LTC3531ES6-3.3#TRMPBF equivalent, key selection criteria include its fixed 3.3V output, 6-pin TSOT-23 package with integrated 0.5Ω NMOS and 0.5Ω/0.8Ω PMOS switches, output disconnect in shutdown, and seamless mode transition between buck, boost, and 4-switch operation without output interruption.
Technical Context
The LTC3531ES6-3.3#TRMPBF implements a four-switch synchronous 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® control reduces quiescent current to 16μA while maintaining tight output regulation via a 1.225V internal reference and 2% accurate comparator.
Internal gate drivers support fast switching with anticross-conduction protection; peak current limit is 365mA (typ), and thermal shutdown activates at ~150°C. The device uses a tOFF timer (~3μs in 4SW mode) and IVALLEY detection (not IZERO) during regulation to maximize load capability per peak current cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.2% (3.25V–3.39V) over full temperature range - ensures stable supply for 3.3V logic and RF sections without external feedback components. |
| Input Voltage Range | 1.8V to 5.5V - supports direct regulation from single Li-Ion (3.1–4.2V), two alkaline (1.8–3.2V), or USB 5V sources. |
| Max Output Current | 200mA at 3.3V with 3.6V input - sufficient for microcontrollers, sensors, and low-power radios in space-constrained designs. |
| Efficiency | Up to 90% at medium loads - minimizes thermal stress and extends battery life in portable applications. |
| Quiescent Current | 16μA typical in Burst Mode - enables >1-year shelf life in always-on IoT endpoints with coin-cell backup. |
| Shutdown Current | <1μA - ensures true zero-load drain during system sleep, critical for energy-harvesting and remote sensor nodes. |
| Switch RDS(ON) | NMOS: 0.5Ω; PMOS A/D: 0.5Ω / 0.8Ω - limits conduction loss and enables high efficiency across input/output voltage differentials. |
Pinout & Package
Package: 6-pin ThinSOT™ (TSOT-23), 2.9mm × 1.6mm × 0.8mm profile, exposed pad not present (S6 variant). Thermal resistance θJA = 102°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW2 (Pin 1) | Buck-boost switch node (internal PMOS D / NMOS C connection) | Connects to inductor second terminal; optional Schottky diode to VOUT improves light-load efficiency but increases EMI risk. |
| GND (Pin 2) | Signal ground reference | Reference for internal comparators, FB (not used in fixed version), and logic - must be low-impedance path to PGND. |
| VOUT (Pin 3) | Regulated output node | Delivers 3.3V to load; requires ≥10μF ceramic capacitor placed adjacent to pin for ripple suppression and load transient response. |
| SHDN (Pin 4) | Enable/disable control input | Pull <0.4V to shut down (output disconnect active); pull >1.4V to enable; hysteresis = 60mV prevents chatter near threshold. |
| VIN (Pin 5) | Main power input | Accepts 1.8–5.5V; requires ≥2.2μF ceramic capacitor from VIN to GND to suppress input ripple and supply switching current. |
| SW1 (Pin 6) | Buck-boost switch node (internal PMOS A / NMOS B connection) | Connects to inductor first terminal; forms switching leg with SW2 - trace length must be minimized for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck/boost converters or complex power sequencing - reduces BOM count by ≥30% vs dual-converter solutions. |
| Burst Mode® operation | Enables 16μA IQ without external compensation or loop tuning - simplifies design for battery lifetime-critical applications. |
| Output disconnect in shutdown | Opens both PMOS rectifiers to isolate VOUT from VIN, preventing backfeed and enabling true zero-voltage standby in system-level power gating. |
| Automatic 3-mode transition (buck/boost/4SW) | Maintains regulation continuity across VIN/VOUT crossover points - avoids output glitches during battery discharge or input source switching. |
| Only 3 external components required (fixed version) | Inductor + 2 capacitors (VIN, VOUT) - accelerates layout, reduces footprint to <12mm², and lowers manufacturing cost vs adjustable alternatives. |
Applications
| Handheld GPS Receivers | Portable Medical Sensors |
|---|---|
Use Scenario: Compact GNSS module powered by single Li-Ion cell with varying voltage (3.1–4.2V) requiring stable 3.3V for RF front-end and baseband processor. IC Role / Device Role / Timing Role: Primary voltage regulator delivering regulated 3.3V with seamless transition as battery discharges below 3.3V. Use Value: Eliminates need for pre-regulator or LDO post-regulator; maintains 3.3V accuracy within ±1.2% across full battery range, ensuring consistent GPS sensitivity and data integrity. | Use Scenario: Wearable ECG patch using two alkaline AA cells (1.8–3.2V) powering analog front-end, ADC, and BLE radio. IC Role / Device Role / Timing Role: System power manager providing 3.3V rail with ultra-low quiescent current to extend disposable battery life beyond 6 months. Use Value: 16μA Burst Mode IQ enables >1000-hour standby; output disconnect prevents leakage into discharged battery, preserving remaining capacity for emergency alerts. |
| Industrial Handheld Scanners | Smart Remote Controls |
Use Scenario: Rugged barcode scanner with intermittent high-current laser and imager loads, powered by NiMH pack (2.4–3.6V). IC Role / Device Role / Timing Role: High-efficiency power stage supporting 200mA pulsed loads while maintaining 3.3V for MCU and communication interface. Use Value: 90% peak efficiency minimizes heat buildup in sealed enclosure; 365mA peak current limit handles motor driver surge without foldback. | Use Scenario: Voice-controlled universal remote using CR2032 coin cell (2.0–3.0V) with IR LED burst transmission and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator enabling simultaneous 3.3V supply to BLE SoC and IR driver circuitry. Use Value: <1μA shutdown current preserves coin cell shelf life; fixed 3.3V eliminates resistor divider errors and layout sensitivity of adjustable versions. |
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; 600mA output; DFN-10 package; requires external compensation network. | Higher output current and frequency suit noise-sensitive audio or faster transient applications; larger package increases PCB area. | Select when >200mA load or tighter output ripple (<10mV) is required; avoid if space or BOM simplicity are primary constraints. |
| TPS63020DSJR | TI part with 96% peak efficiency; 2.5V–5.5V input; 3.3V fixed option; 1.2MHz frequency; integrated soft-start. | Higher efficiency at heavy loads; no output disconnect in shutdown; different pinout and thermal pad requirements. | Prefer for higher-power portable devices where thermal performance is critical; verify SHDN behavior and layout compatibility before substitution. |
Compared with LTC3531ES6-3.3#TRMPBF, LTC3440EDD-3.3#PBF offers greater current headroom and bandwidth at the cost of complexity and size, while TPS63020DSJR delivers superior heavy-load efficiency but lacks true output disconnect - making LTC3531ES6-3.3#TRMPBF optimal for ultra-low-power, space-constrained, and battery-isolation-critical designs.
Availability
LTC3531ES6-3.3#TRMPBF is available at Aetrix Electronics and suitable for handheld instrumentation, portable medical sensors, and industrial scanning equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3531ES6-3.3#TRMPBF 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 continues to develop, manufacture, and support its precision analog and power management portfolio.
The LTC3531 family was designed specifically for battery-powered portable electronics needing single-inductor buck-boost regulation with minimal external components and ultra-low quiescent current - targeting handheld, medical, and industrial edge devices.
FAQ
What is the minimum input voltage required for LTC3531ES6-3.3#TRMPBF to start up?
The LTC3531ES6-3.3#TRMPBF has a minimum startup voltage of 1.8V (typical), with absolute minimum specified at 1.65V. Below this threshold, the UVLO circuit prevents operation to protect internal circuitry. Startup into a resistive load is verified down to 1.8V with 10μH inductor and 10μF output capacitor.
Does LTC3531ES6-3.3#TRMPBF support output disconnect during shutdown?
Yes, LTC3531ES6-3.3#TRMPBF provides true output disconnect by opening both internal PMOS rectifiers when SHDN is pulled low. This isolates VOUT from VIN, allowing VOUT to discharge to 0V and eliminating backfeed - a key feature for system-level power gating and battery safety compliance.
What is the recommended inductor value for LTC3531ES6-3.3#TRMPBF in a typical 3.3V application?
A 10μH ferrite inductor with ≥500mA saturation current and <400mΩ DCR is recommended for LTC3531ES6-3.3#TRMPBF. Murata LQH43CN100K03 (650mA, 0.24Ω) is a validated choice. Lower values increase ripple and peak current; higher values reduce ripple but degrade transient response and light-load efficiency.
Can LTC3531ES6-3.3#TRMPBF operate with input voltage equal to output voltage?
Yes, LTC3531ES6-3.3#TRMPBF operates seamlessly in 4-switch mode when VIN is within ~400mV below to ~800mV above VOUT (i.e., 2.9V–4.1V for 3.3V output). In this region, it dynamically alternates between buck and boost phases using all four internal switches - maintaining regulation without dropout or mode-switching glitches.
Is an external feedback resistor divider required for LTC3531ES6-3.3#TRMPBF?
No, LTC3531ES6-3.3#TRMPBF is the fixed 3.3V output version - internal resistor divider sets VOUT, and the FB pin is not bonded out. External resistors are only needed for the adjustable LTC3531EDD variant; adding them to LTC3531ES6-3.3#TRMPBF has no effect and may impair reliability.
LTC3531ES6-3.3#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- 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:
- TSOT-23-6
LTC3531ES6-3.3#TRMPBF FAQ
1.How can I place an order for LTC3531ES6-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3531ES6-3.3#TRMPBF 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 LTC3531ES6-3.3#TRMPBF reliable?
The price and inventory of LTC3531ES6-3.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3531ES6-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3531ES6-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3531ES6-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3531ES6-3.3#TRMPBF?
LTC3531ES6-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3531ES6-3.3#TRMPBF 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 LTC3531ES6-3.3#TRMPBF?
For technical support, including LTC3531ES6-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3531ES6-3.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3531ES6-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3531ES6-3.3#TRMPBF 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 LTC3531ES6-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3531ES6-3.3#TRMPBF?
All LTC3531ES6-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3531ES6-3.3#TRMPBF, 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 LTC3531ES6-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3531ES6-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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