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Texas Instruments BQ71533DCKR
- Part No.:
- BQ71533DCKR
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
BQ71533DCKR.pdf
- Description:
- IC REG LINEAR 3.3V 50MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,694
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Product details
Overview
BQ71533DCKR from Texas Instruments is a 3.3-V, 50-mA ultra-low-quiescent-current low-dropout (LDO) linear regulator in SC70-5 (DCK) package, featuring 415-mV dropout at 50 mA, 3.2-µA quiescent current, and stability with ≥0.47-µF output capacitors. It powers MSP430 microcontrollers in battery-constrained systems such as solar-powered sensor nodes.
For engineers reviewing the BQ71533DCKR datasheet, BQ71533DCKR pinout, BQ71533DCKR application, or BQ71533DCKR equivalent, key selection considerations include input voltage range (up to 24 V), thermal performance in SC70 packaging, dropout behavior under load, and compatibility with MSP430 supply requirements for FLASH and core operation.
Technical Context
The BQ71533DCKR uses a PMOS pass element instead of a traditional PNP transistor, enabling low dropout voltage directly proportional to load current. Its internal bandgap reference (1.205 V) and feedback architecture support precise 3.3-V regulation across –40°C to +125°C junction temperature.
It integrates leakage null control active below 5 µA load and above 100°C die temperature, and features built-in current limiting (~500 mA) and reverse-current protection via the PMOS body diode. No external compensation is required due to inherent stability with any ≥0.47-µF capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full operating range - ensures reliable MSP430F2xx FLASH operation above 2.2 V minimum VIN requirement. |
| Max Input Voltage | 24 V - supports unregulated sources including solar panels and industrial rails without pre-regulation. |
| Quiescent Current | 3.2 µA typical at 50 mA - enables multi-year battery life in always-on sensor applications. |
| Dropout Voltage | 415 mV at 50 mA - allows operation down to VIN = 3.715 V while maintaining regulated 3.3 V output. |
| Output Capacitor | ≥0.47 µF ceramic or tantalum - eliminates need for high-ESR capacitors; enables compact, low-BOM designs. |
| PSRR | 60 dB at 100 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial and outdoor embedded deployments. |
Pinout & Package
SC70-5 (DCK) package: 5-pin, 2.0 mm × 2.1 mm × 0.9 mm body, moisture sensitivity level 1, RoHS-compliant green finish (Pb-free, no Sb/Br).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB/NC) | Feedback / No Connection | Fixed-output variant: internally connected; no external resistor network required - simplifies layout and reduces component count. |
| 2 (GND) | Ground Reference | Primary return path for load current and internal bias - must be low-impedance connection to minimize ground bounce and output error. |
| 3 (NC) | No Connection | Unbonded die pad - electrically isolated; no routing or thermal tie required. |
| 4 (IN) | Input Supply | Accepts 2.5 V to 24 V; requires local 0.1-µF bypass capacitor near pin for transient immunity and PSRR enhancement. |
| 5 (OUT) | Regulated Output | Delivers stable 3.3 V to load; connects directly to MSP430 VCC and decoupling capacitors - output impedance <1 Ω up to 100 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Element | Enables 415-mV dropout at full 50-mA load - extends usable battery voltage range by >300 mV vs. bipolar-based LDOs. |
| Ultra-Low IQ | 3.2-µA quiescent current stable from 0 to 50 mA - maintains efficiency at micropower sleep states without sacrificing wake-up response. |
| Capacitor-Free Stability | Stable with any ≥0.47-µF output capacitor - eliminates ESR constraints and enables use of low-cost X5R/X7R ceramics. |
| MSP430-Optimized | 3.3-V output meets VCC min/max specs for MSP430F2xx FLASH programming and core operation - avoids under-voltage lockout. |
| Reverse Current Protection | PMOS body diode blocks reverse conduction during power-down - prevents backfeed into input rail without external diode. |
Applications
| Solar-Powered Sensor Node | MSP430-Based Data Logger |
|---|---|
Use Scenario: Outdoor environmental monitoring using unregulated solar panel input and coin-cell backup. IC Role / Device Role / Timing Role: Primary 3.3-V power source for MSP430FR5969, ADC, and RF transceiver during daylight; maintains regulation down to 3.715 V input. Use Value: 3.2-µA IQ extends battery-only runtime to >6 months; 24-V input tolerance eliminates need for input overvoltage clamping. |
Use Scenario: Portable industrial data logger with intermittent sampling and deep-sleep cycles. IC Role / Device Role / Timing Role: Supplies regulated 3.3 V to MSP430FR2355 core and integrated 12-bit SAR ADC during active measurement windows. Use Value: 415-mV dropout enables operation until battery reaches 3.715 V, maximizing energy extraction from 3.6-V Li-SOCl₂ cells. |
| Low-Power Wireless Transceiver Power | Energy-Harvesting Wearable |
Use Scenario: BLE module (e.g., CC2640R2F) powered from a 3.6-V primary cell with tight voltage margins. IC Role / Device Role / Timing Role: Provides clean, low-noise 3.3-V rail to radio PHY and digital baseband - critical for RF sensitivity and packet error rate. Use Value: 60-dB PSRR at 100 kHz attenuates switching noise from companion buck converter; 575-µVrms output noise preserves SNR. |
Use Scenario: Piezoelectric energy harvesting powering ultra-low-power health monitor with MSP430FR2155 MCU. IC Role / Device Role / Timing Role: Regulates erratic harvested voltage (2.8–22 V) to stable 3.3 V for MCU and analog front-end during burst transmissions. Use Value: Stable with 0.47-µF output cap enables use of miniature 0402 MLCCs; SC70 footprint minimizes PCB area in space-constrained wearables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS71533DCKR | Same electrical specs, identical SC70-5 pinout, but manufactured under standard commercial process (non-automotive grade). | Qualified for general industrial use; lacks AEC-Q100 qualification and extended temperature screening of BQ71533DCKR. | Select TPS71533DCKR for cost-sensitive non-automotive designs where automotive reliability is not required. |
| BQ71533QDBVR | Same 3.3-V output and 50-mA rating, but in SOT-23-5 (DBV) package - larger footprint, higher RθJA (335°C/W vs. 395°C/W). | Offers higher power dissipation margin at elevated ambient temperatures due to better thermal pad exposure in DBV. | Choose BQ71533QDBVR when board-level thermal management is constrained and SC70 thermal limits are exceeded. |
Compared with TPS71533DCKR and BQ71533QDBVR, the BQ71533DCKR provides automotive-grade reliability in the smallest footprint, making it optimal for space- and mission-critical applications where AEC-Q100 compliance and minimal PCB area are mandatory.
Availability
BQ71533DCKR is available at Aetrix Electronics and suitable for solar-powered sensors, MSP430-based data loggers, and low-power wireless transceivers requiring stable component supply, long-lifecycle assurance, and automotive-grade traceability.
Supply support for BQ71533DCKR 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
Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions, with leadership in power management ICs and low-power system design.
The BQ71533DCKR belongs to TI's automotive-qualified LDO family, engineered specifically for AEC-Q100-compliant applications demanding ultra-low IQ, wide-input-voltage operation, and robust thermal performance in compact packages.
FAQ
What is the maximum input voltage rating for the BQ71533DCKR?
The BQ71533DCKR supports a maximum input voltage of 24 V, as specified in its absolute maximum ratings. This allows direct connection to unregulated sources such as solar panels or industrial 24-V rails without external overvoltage protection. Operation above this voltage risks permanent damage, and the device is not designed to clamp or regulate beyond 24 V. Always verify input transients remain within this limit in final system design.
Does the BQ71533DCKR require an external feedback resistor network?
No, the BQ71533DCKR is a fixed-output 3.3-V regulator and does not require external feedback resistors. Pin 1 (FB/NC) is internally connected for the fixed version - unlike the adjustable TPS71501, no resistor divider is needed. This eliminates tuning errors, reduces BOM count, and improves layout simplicity and long-term stability in production.
How does the BQ71533DCKR handle reverse current flow during power-down?
The BQ71533DCKR incorporates a PMOS pass transistor with an intrinsic body diode that conducts reverse current when VIN falls below VOUT. While this prevents output voltage collapse during fast input decay, reverse current is not internally limited. For applications where sustained reverse bias may occur, designers should add an external Schottky diode in series with the input or implement system-level isolation to avoid unintended discharge paths.
What output capacitor value is required for stability with the BQ71533DCKR?
The BQ71533DCKR is stable with any output capacitor ≥0.47 µF, including ceramic (X5R, X7R), tantalum, or aluminum electrolytic types. Unlike many LDOs, it imposes no ESR minimum or maximum - enabling use of low-ESR 0402/0603 MLCCs. A 1-µF X7R ceramic capacitor is recommended for optimal transient response and noise performance in MSP430 applications.
Is the BQ71533DCKR pin-compatible with other TPS715xx variants in SC70-5 package?
Yes, the BQ71533DCKR shares identical SC70-5 (DCK) pinout and footprint with all TPS715xx and BQ715xx variants in the same package, including TPS71533DCKR and BQ71525DCKR. Pin assignments (IN, GND, NC, OUT, FB/NC) are consistent across the family, enabling voltage-option flexibility without PCB redesign - provided thermal and layout constraints for the specific output current are met.
BQ71533DCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.75V @ 50mA
- Current - Output:
- 50mA
- Current - Quiescent (Iq):
- 4.2 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (100kHz)
- Control Features:
- -
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
BQ71533DCKR FAQ
1.How can I place an order for BQ71533DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ71533DCKR 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 BQ71533DCKR reliable?
The price and inventory of BQ71533DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ71533DCKR is usually 5 days.
3.What payment methods are accepted for BQ71533DCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ71533DCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ71533DCKR?
BQ71533DCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ71533DCKR 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 BQ71533DCKR?
For technical support, including BQ71533DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ71533DCKR requirements.
6.How does Aetrix verify that BQ71533DCKR is sourced from the original manufacturer or authorized distributors?
All BQ71533DCKR 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 BQ71533DCKR meets industry standards.
7.What is the process for return or replacement of BQ71533DCKR?
All BQ71533DCKR units undergo pre-shipment inspection (PSI). If there is an issue with BQ71533DCKR, 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 BQ71533DCKR part is unused and in its original packaging.
Return procedure for BQ71533DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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