My Inquiry
My Account
Analog Devices Inc. LTC3531EDD-3#TRPBF
- Part No.:
- LTC3531EDD-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3531EDD-3#TRPBF.pdf
- Description:
- IC REG BUCK BST 3.02V 200MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,982
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3531EDD-3#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous buck-boost DC/DC converter designed for single-cell Li-Ion and multi-cell alkaline/nickel battery-powered systems. It delivers 200mA at 3.3V output from 3.6V input, operates across 1.8V–5.5V input range, achieves up to 90% efficiency in 4-switch mode, and features Burst Mode® operation with 16μA quiescent current for ultra-low-power handheld instrumentation.
For engineers reviewing the LTC3531EDD-3#TRPBF datasheet, LTC3531EDD-3#TRPBF pinout, LTC3531EDD-3#TRPBF application, or LTC3531EDD-3#TRPBF equivalent, key selection criteria include its fixed 3.3V output, DFN-8 package with exposed thermal pad, input voltage crossover capability (VIN above/below/equal VOUT), and integrated 0.5Ω NMOS / 0.8Ω PMOS switches enabling single-inductor operation without external compensation.
Technical Context
The LTC3531EDD-3#TRPBF implements a four-switch buck-boost topology with automatic mode transition between boost, 4-switch, and buck regions based on real-time VIN–VOUT differential sensing. Its state machine uses IPEAK (365mA typ), IVALLEY detection, and tOFF timing (~3μs in AD conduction) to regulate output while preventing cross-conduction between complementary MOSFET pairs (A/B and C/D).
Burst Mode® control employs a 1.225V internal reference and ~1% hysteresis comparator to gate switching cycles, minimizing sleep-mode current to 16μA. Output disconnect during shutdown is achieved by opening both P-channel rectifiers, ensuring true 0V VOUT and zero-load input current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.2% over –40°C to 85°C, enabling direct replacement of LDOs in 3.3V rail applications. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-Ion (3.1–4.2V), two-cell alkaline (1.8–3.2V), and USB-powered (4.35–5.25V) inputs without external level shifting. |
| Max Output Current | 200mA at 3.3V from 3.6V input - sufficient for microcontrollers, sensors, and RF transceivers in portable devices. |
| Quiescent Current | 16μA typical - extends battery life in always-on monitoring systems where load currents drop below 100μA. |
| Switch RDS(ON) | NMOS (A/C): 0.5Ω; PMOS (D): 0.8Ω at VIN = 5V - enables high efficiency (>85%) across light-to-moderate loads without external FETs. |
| Shutdown Current | <1μA - ensures negligible battery drain during system sleep or storage modes. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin environments without derating. |
Pinout & Package
The LTC3531EDD-3#TRPBF is housed in an 8-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9, connected to GND). The package provides low θJA = 43°C/W and requires soldering the exposed pad to PCB ground for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 1) | Buck-boost switch node (internal NMOS A & PMOS B connection) | Connects to one end of power inductor; must be routed with minimal loop area to reduce EMI in all operating modes. |
| VIN (Pin 2) | Main input supply connection | Accepts 1.8–5.5V; requires ≥2.2μF ceramic capacitor placed adjacent to pin for high-frequency decoupling. |
| GND (Pin 3) | Signal ground reference | Provides analog reference for feedback and control circuits; should be tied to PGND via short, low-impedance path. |
| SHDN (Pin 4) | Enable/disable control input | Logic-low (<0.4V) forces full shutdown with <1μA current; logic-high (>1.4V) enables regulation with 60mV hysteresis. |
| FB (Pin 5) | Feedback input (not bonded in fixed 3.3V version) | No connection required - internal resistor divider sets VOUT = 3.3V; pin left floating per datasheet. |
| VOUT (Pin 6) | Regulated output terminal | Delivers 3.3V ±1.2%; requires 4.7–22μF ceramic output capacitor placed directly between VOUT and GND for ripple suppression. |
| PGND (Pin 8) | Power ground return for switches | Carries high di/dt switch currents; must be connected to GND plane under exposed pad with multiple thermal vias. |
| Exposed Pad (Pin 9) | Thermal and electrical ground | Must be soldered to PCB ground plane to maintain TJ < 125°C at full load; improves efficiency and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate boost/buck ICs or coupled inductors - reduces BOM count and PCB area by >30% vs dual-converter solutions. |
| Burst Mode® operation | Enables 16μA quiescent current and maintains >80% efficiency down to 100μA load - critical for battery runtime in intermittent-sensing applications. |
| Automatic mode transition | Seamlessly shifts between boost, 4-switch, and buck modes as VIN varies relative to VOUT - ensures continuous regulation without output dropout during battery discharge. |
| True output disconnect | Opens both P-channel rectifiers in shutdown - prevents backfeed, eliminates VOUT leakage, and allows safe hot-swap of battery or input source. |
| No external compensation required | Internal compensation network simplifies design - only three external components (inductor, input cap, output cap) needed for fixed-output versions. |
Applications
| Handheld Instruments | MP3 Players |
|---|---|
Use Scenario: Portable multimeter powered by two AA alkaline cells (1.8–3.2V) requiring stable 3.3V for MCU and ADC. IC Role / Device Role / Timing Role: Primary voltage regulator maintaining 3.3V rail across full battery discharge curve, enabling accurate measurements without recalibration. Use Value: Delivers 80mA at 3V output from 2.5V input with >85% efficiency - extends battery life by 2.1× vs linear regulator solution. | Use Scenario: Flash-based audio player using single-cell Li-Ion (3.1–4.2V) powering 3.3V DAC, codec, and display controller. IC Role / Device Role / Timing Role: Buck-boost regulator supplying regulated 3.3V regardless of battery state - avoids brownouts during high-current playback peaks. Use Value: Provides 160mA at 3.3V with <15mVpp ripple - meets audio SNR requirements while sustaining >90% efficiency at mid-battery voltage. |
| PDA/GPS Receivers | USB-Powered Peripherals |
Use Scenario: GPS module in handheld PDA drawing pulsed 150mA loads while powered by 2×AA alkaline (1.8–3.2V). IC Role / Device Role / Timing Role: Core power supply delivering uninterrupted 3.3V to GPS RF front-end and baseband processor during satellite acquisition bursts. Use Value: Maintains regulation during 200mA transient loads with <2% output deviation - ensures reliable signal lock even at end-of-battery life. | Use Scenario: USB-to-serial adapter drawing power from USB host (4.35–5.25V) while generating local 3.3V for UART IC and level shifters. IC Role / Device Role / Timing Role: Input-voltage-flexible regulator accepting wide USB range and rejecting noise from shared bus without additional filtering. Use Value: Achieves 88% efficiency at 5V input/3.3V@100mA - reduces thermal stress in compact enclosures and meets USB power budget limits. |
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#TRPBF | Adjustable output (2.5–5.5V), 600mA max, 2MHz switching, no Burst Mode - higher IQ (25μA) | Requires external feedback resistors; better suited for variable-rail systems needing >3.3V outputs | Select when adjustable VOUT or higher current is required; not pin-compatible due to different FB handling and pinout. |
| TPS63020DSJR | 3.0–5.5V input, 600mA, 2.5MHz, 11μA IQ, integrated soft-start - lacks true output disconnect | Higher efficiency at light loads but allows VOUT leakage during shutdown | Choose for cost-sensitive consumer designs where output disconnect is non-critical and higher peak current is needed. |
Compared with LTC3531EDD-3#TRPBF, LTC3440EDD#TRPBF offers flexibility at the cost of complexity and higher quiescent current, while TPS63020DSJR trades output disconnect capability for higher integration and lower cost - making LTC3531EDD-3#TRPBF optimal for battery-critical, safety-aware portable instrumentation.
Availability
LTC3531EDD-3#TRPBF 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#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 continues to manufacture and support its precision analog and power management portfolio.
The LTC3531 series belongs to Linear's high-efficiency, low-quiescent-current DC/DC converter product line, engineered specifically for battery-powered portable electronics where input voltage varies across the output rail and minimal standby power is essential.
FAQ
What is the minimum input voltage required for LTC3531EDD-3#TRPBF to start up?
The LTC3531EDD-3#TRPBF has a minimum startup voltage of 1.65V (typical) and 1.8V (guaranteed) per its absolute maximum ratings table. Startup into a resistive load occurs reliably at 1.8V input, with the device entering start-up mode using the D switch body diode until VOUT reaches ~1.6V, after which normal 4-switch regulation begins.
Does LTC3531EDD-3#TRPBF require external compensation components?
No, the LTC3531EDD-3#TRPBF does not require external compensation components. Its internal compensation network is optimized for the fixed 3.3V output version, allowing full regulation with only three external passive components: the power inductor, input capacitor (≥2.2μF), and output capacitor (4.7–22μF).
Can LTC3531EDD-3#TRPBF drive a 200mA load across its entire input voltage range?
The LTC3531EDD-3#TRPBF delivers 200mA at 3.3V output when VIN is 3.6V, but maximum output current decreases at extremes: 125mA at 2.5V input (boost-limited) and reduced capability near 5.5V due to thermal constraints. Full 200mA is guaranteed only within the 3.0–4.5V input window per typical performance graphs.
How does LTC3531EDD-3#TRPBF achieve output disconnect during shutdown?
The LTC3531EDD-3#TRPBF achieves true output disconnect by opening both P-channel MOSFET rectifiers (switches A and D) during shutdown, breaking the conductive path between VIN and VOUT. This ensures VOUT drops to 0V and draws zero current from the input source - a feature confirmed in the "Output Disconnect and Inrush Limiting" section of the datasheet.
Is the FB pin used in the LTC3531EDD-3#TRPBF configuration?
No, the FB pin is not bonded internally in the LTC3531EDD-3#TRPBF. As a fixed 3.3V output variant, the device uses an internal resistor divider to set VOUT; the FB pin (Pin 5) is left unconnected and must not be tied to any external circuitry to avoid interference with regulation.
LTC3531EDD-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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):
- 3.02V
- 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#TRPBF FAQ
1.How can I place an order for LTC3531EDD-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3531EDD-3#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 LTC3531EDD-3#TRPBF reliable?
The price and inventory of LTC3531EDD-3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3531EDD-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3531EDD-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3531EDD-3#TRPBF?
LTC3531EDD-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3531EDD-3#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 LTC3531EDD-3#TRPBF?
For technical support, including LTC3531EDD-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3531EDD-3#TRPBF requirements.
6.How does Aetrix verify that LTC3531EDD-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3531EDD-3#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 LTC3531EDD-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3531EDD-3#TRPBF?
All LTC3531EDD-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3531EDD-3#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 LTC3531EDD-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3531EDD-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3531EDD-3#TRPBF 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…
