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Texas Instruments BQ71533DCKRG4
- Part No.:
- BQ71533DCKRG4
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
BQ71533DCKRG4.pdf
- Description:
- IC REG LINEAR 3.3V 50MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,537
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Product details
Overview
BQ71533DCKRG4 from Texas Instruments is a 3.3-V fixed-output, 50-mA ultra-low-quiescent-current LDO voltage 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 portable gas meters and solar-powered sensor nodes.
For engineers reviewing the BQ71533DCKRG4 datasheet, BQ71533DCKRG4 pinout, BQ71533DCKRG4 application, or BQ71533DCKRG4 equivalent, key selection criteria include input voltage range (up to 24 V), thermal performance in SC70 packaging, dropout behavior under load, and compatibility with low-power microcontroller supply sequencing requirements.
Technical Context
The BQ71533DCKRG4 employs a PMOS pass element enabling low dropout voltage directly proportional to load current, unlike traditional PNP-based LDOs. 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 >100°C die temperature, ensuring stable ground current (3.2–4.8 µA) over full operating conditions. The device requires no external compensation and accepts ceramic, tantalum, or polymer capacitors ≥0.47 µF for loop stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% accuracy over full load, line, and temperature range - ensures reliable MSP430F2xx FLASH operation above 2.2 V minimum VIN. |
| Max Input Voltage | 24 V - supports unregulated solar panel inputs and industrial 24-V rails without pre-regulation. |
| Quiescent Current | 3.2 µA typical at 50 mA - enables multi-year battery life in always-on IoT endpoints. |
| Dropout Voltage | 415 mV at 50 mA - allows operation down to 3.715 V input while sustaining 3.3 V output, critical for fading battery sources. |
| Output Capacitor | ≥0.47 µF - enables use of small, low-ESR ceramic capacitors; eliminates need for tantalum or large electrolytics. |
| PSRR | 60 dB at 100 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial and outdoor environmental operation. |
Pinout & Package
SC70-5 (DCK) package: 1.25 mm × 2.1 mm footprint, 0.65 mm pitch, single-row 5-pin surface-mount outline with exposed pad option (not electrically connected in standard DCK).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: FB/NC | Feedback / No Connection | NC for fixed-output BQ71533DCKRG4; not internally connected - must be left floating or grounded per layout best practice. |
| 2: GND | Ground Reference | Primary return path for load current and internal bias; requires low-inductance connection to system ground plane. |
| 3: NC | No Connection | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or ESD path disruption. |
| 4: IN | Input Supply | Accepts 3.0–24 V DC; requires local 0.1-µF ceramic bypass capacitor placed within 2 mm of pin for transient immunity. |
| 5: OUT | Regulated Output | Delivers stable 3.3 V to load; connects directly to MSP430 VCC with ≥0.47-µF output capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Element | Enables load-proportional dropout (415 mV @ 50 mA) and eliminates reverse-current diode losses during power-down. |
| Leakage Null Control | Maintains ground current ≤4.8 µA even at 24 V input and +125°C, preventing quiescent current runaway in high-temp deployments. |
| Capacitor Flexibility | Stable with any ≥0.47-µF output capacitor type (X7R, X5R, tantalum), simplifying BOM and reducing layout sensitivity. |
| Wide Input Range | Operates from 3.0 V to 24 V - accommodates direct connection to Li-ion, 2S/3S battery stacks, and industrial 12/24-V supplies. |
| MSP430-Optimized | 3.3-V output meets VCC requirements for MSP430F2xx, G2xx, and FRAM families while staying below 3.6-V absolute max rating. |
Applications
| Smart Utility Metering | Solar-Powered Remote Sensors |
|---|---|
Use Scenario: Battery-backed gas/water meter with RF telemetry and real-time clock. IC Role / Device Role / Timing Role: Primary 3.3-V supply for MSP430FR5969 MCU and sub-GHz transceiver during sleep and burst transmit cycles. Use Value: 3.2-µA quiescent current extends 10-year battery life; 24-V input tolerance allows integration of energy-harvesting boost stage. |
Use Scenario: Environmental monitoring node powered by small solar cell and supercapacitor buffer. IC Role / Device Role / Timing Role: Regulated 3.3-V rail for MSP430G2553 and analog sensor front-end during variable-light conditions. Use Value: Stable regulation down to 3.715 V input enables continuous operation as solar voltage sags at dawn/dusk. |
| Portable Medical Diagnostics | Industrial Wireless Sensor Network |
Use Scenario: Handheld blood glucose analyzer with LCD, USB interface, and BLE radio. IC Role / Device Role / Timing Role: Low-noise 3.3-V supply for precision ADC and digital logic, decoupled from noisy USB power domain. Use Value: 575-µVRMS output noise and 60-dB PSRR prevent measurement corruption in 16-bit analog signal chain. |
Use Scenario: DIN-rail-mounted vibration sensor node in factory automation with 24-V field bus power. IC Role / Device Role / Timing Role: Local 3.3-V regulator for MSP430F5529 and MEMS accelerometer, isolated from 24-V supply ripple. Use Value: 24-V max input eliminates need for external pre-regulator; SC70 package enables compact 2-layer PCB design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS71533DCKRG4 | Same electrical specs, identical SC70-5 pinout, but manufactured under TPS715xx family branding (BQ715xx is automotive-qualified variant). | Qualified to AEC-Q100 Grade 3 (–40°C to +125°C); includes enhanced ESD robustness (2-kV HBM) and production traceability for automotive Tier-1 supply chains. | Select BQ71533DCKRG4 when automotive qualification, extended temperature validation, or TI's BQ-series lifecycle management is required. |
| MCP1700T-3302E/TT | 3.3-V fixed LDO; 1.6-µA IQ, 6-V max input, SOT-23-3 package - lower IQ but narrower input range and different pinout (IN-GND-OUT vs DCK's IN-GND-NC-FB/NC-OUT). | Lacks 24-V capability and MSP430-specific validation; suitable only for <6-V battery systems where ultra-low IQ dominates design priority. | Choose MCP1700T-3302E/TT only for space-constrained, sub-6-V applications where 24-V tolerance and MSP430 timing margin are irrelevant. |
Compared with TPS71533DCKRG4, BQ71533DCKRG4 offers identical performance with added automotive qualification and traceability, while MCP1700T-3302E/TT trades input voltage headroom and pin compatibility for marginally lower quiescent current in low-voltage-only designs.
Availability
BQ71533DCKRG4 is available at Aetrix Electronics and suitable for smart utility metering, solar-powered remote sensors, portable medical diagnostics, industrial wireless sensor networks, and battery-backed real-time clock systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BQ71533DCKRG4 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, signal chain, and microcontroller technologies since 1930.
The BQ71533DCKRG4 belongs to TI's BQ715xx automotive-grade LDO family, designed specifically for safety-critical and mission-reliability applications in automotive, industrial, and medical systems requiring AEC-Q100 compliance and extended temperature operation.
FAQ
What is the maximum input voltage rating for the BQ71533DCKRG4?
The BQ71533DCKRG4 supports a maximum input voltage of 24 V, as specified in its Absolute Maximum Ratings table. This allows direct connection to unregulated 24-V industrial rails or solar panel outputs without external pre-regulation. Operation above 24 V risks permanent damage, and the device must never be subjected to input transients exceeding this limit, even momentarily.
Does the BQ71533DCKRG4 require an external feedback resistor network?
No, the BQ71533DCKRG4 is a fixed 3.3-V output regulator and does not require external feedback resistors. Pin 1 (FB/NC) is a no-connect terminal for this variant - it must be left unconnected or tied to ground per layout guidelines. External resistor dividers are only used with the adjustable TPS71501 variant, not with BQ71533DCKRG4.
What output capacitor value and type are required for stability with the BQ71533DCKRG4?
The BQ71533DCKRG4 is stable with any output capacitor ≥0.47 µF, including X7R/X5R ceramics, tantalum, or polymer types. TI recommends X7R ceramics for lowest ESR and smallest footprint. A 1-µF X7R capacitor placed within 2 mm of the OUT pin is typical for optimal transient response and noise suppression in MSP430 applications.
How does the BQ71533DCKRG4 behave during reverse voltage conditions?
When input voltage drops below output voltage (e.g., during power-down), the BQ71533DCKRG4's PMOS pass transistor conducts reverse current from OUT to IN via its intrinsic body diode. This current is not internally limited and can exceed safe levels if uncontrolled. External reverse-current protection - such as a series Schottky diode or ideal diode controller - is recommended in systems prone to output-backdrive scenarios.
Is the BQ71533DCKRG4 pin-compatible with other TPS715xx variants in SC70-5 package?
Yes, the BQ71533DCKRG4 shares identical SC70-5 (DCK) mechanical dimensions, pin count, and pinout with all TPS715xx and BQ715xx variants in the same package, including TPS71533DCKRG4 and TPS71525DCKRG4. This enables drop-in replacement across output voltage options without PCB redesign, provided thermal and layout constraints remain consistent.
BQ71533DCKRG4 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
BQ71533DCKRG4 FAQ
1.How can I place an order for BQ71533DCKRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ71533DCKRG4 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 BQ71533DCKRG4 reliable?
The price and inventory of BQ71533DCKRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ71533DCKRG4 is usually 5 days.
3.What payment methods are accepted for BQ71533DCKRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ71533DCKRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ71533DCKRG4?
BQ71533DCKRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ71533DCKRG4 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 BQ71533DCKRG4?
For technical support, including BQ71533DCKRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ71533DCKRG4 requirements.
6.How does Aetrix verify that BQ71533DCKRG4 is sourced from the original manufacturer or authorized distributors?
All BQ71533DCKRG4 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 BQ71533DCKRG4 meets industry standards.
7.What is the process for return or replacement of BQ71533DCKRG4?
All BQ71533DCKRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ71533DCKRG4, 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 BQ71533DCKRG4 part is unused and in its original packaging.
Return procedure for BQ71533DCKRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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