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STMicroelectronics LDBL20D-33R
- Part No.:
- LDBL20D-33R
- Manufacturer:
- STMicroelectronics
- Package:
- 4-XFQFN
- Datasheet:
-
LDBL20D-33R.pdf
- Description:
- IC REG LIN 3.3V 200MA 4STSTAMP
- Quantity:
- Payment:
- Shipping:
Inventory:6,328
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Product details
Overview
LDBL20D-33R from STMicroelectronics is a 3.3 V, 200 mA ultra-low-dropout linear regulator IC with 200 mV typical dropout at full load, 20 µA typical quiescent current at no load, ±1.5% output voltage accuracy at 25 °C, and logic-controlled enable input-designed for space-constrained battery-powered systems such as wearable devices and digital still cameras.
For engineers reviewing the LDBL20D-33R datasheet, LDBL20D-33R pinout, LDBL20D-33R application, or LDBL20D-33R equivalent, this page delivers verified technical context, package mapping to STSTAMP™ (0.47 × 0.47 mm²), confirmed pin functions, real-world load regulation performance, and validated alternative options for low-quiescent-current LDO selection.
Technical Context
The LDBL20D-33R integrates a bandgap reference, error amplifier, and internal PMOS pass transistor in a fully regulated feedback loop. Its soft-start circuit limits inrush current by controlling output ramp-up over ~100 µs without external components.
It features an optional integrated discharge MOSFET (enabled in this variant per order code "D") that actively pulls VOUT to GND when EN is low, ensuring rapid output discharge. Thermal shutdown activates at 160 °C with 20 °C hysteresis, and constant-current limiting caps short-circuit current at 250–350 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 3.3 V ±1.5% at 25 °C; maintains regulation across -40 °C to 125 °C junction temperature |
| Max output current | 200 mA guaranteed; internally current-limited to 250–350 mA under short-circuit |
| Dropout voltage | 200 mV typ. at 200 mA load; enables operation from 3.5 V input down to 3.3 V output |
| Quiescent current | 20 µA typ. at no load; drops to 0.03 µA typ. in shutdown mode (EN = GND) |
| PSRR | 80 dB at 1 kHz, 55 dB at 100 kHz-suppresses ripple from noisy battery or switching supply inputs |
| Output noise | 45 µVRMS over 10 Hz–100 kHz-critical for powering RF, ADC, or precision analog blocks |
| Input voltage range | 1.5 V to 5.5 V-supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH sources |
Pinout & Package
Supplied in STMicroelectronics' STSTAMP™ ultra-miniature package (0.47 × 0.47 mm², 0.2 mm height), optimized for high-density portable PCBs with non-solder-mask-defined pads and 75 µm stencil thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable logic input | Active-high control: <0.4 V = shutdown (<0.2 µA IIN); >1 V = active; input leakage <100 nA |
| 2 (IN) | Power input | Accepts 1.5–5.5 V; requires ≥1 µF ceramic capacitor placed adjacent to pin for stability |
| 3 (OUT) | Regulated output | Delivers 3.3 V @ up to 200 mA; supports 0.47–22 µF ceramic output capacitors; includes auto-discharge MOSFET |
| 4 (GND) | Analog ground reference | Common return for IN, OUT, and EN; must be low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 20 µA typ. at no load ensures >1-year battery life in always-on wearables with 100 mAh cells |
| Internal soft-start | 100 µs controlled ramp-up eliminates inrush current spikes-no external capacitor required |
| Output voltage discharge | Integrated MOSFET discharges COUT rapidly on shutdown, preventing residual voltage hold-up in power sequencing |
| Ceramic capacitor compatibility | Stable with 0.47 µF X5R/X7R ceramics-reduces BOM count and board area vs. tantalum or electrolytic alternatives |
| High PSRR at 100 kHz | 55 dB rejection enables clean 3.3 V rail even when co-located with 100 kHz DC-DC converters |
Applications
| Wearable Health Monitor | Digital Still Camera (DSC) Sensor Bias |
|---|---|
|
Use Scenario: Powering optical heart-rate sensor and BLE SoC in compact wrist-worn device with coin-cell battery. IC Role / Device Role / Timing Role: Primary 3.3 V LDO delivering stable bias to analog front-end and radio transceiver. Use Value: 0.03 µA shutdown current extends shelf life; 45 µVRMS noise avoids signal corruption in photodiode amplification path. |
Use Scenario: Supplying image sensor analog core and timing controller during burst capture mode. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO providing clean 3.3 V for pixel readout and ADC reference. Use Value: 200 mA capability supports peak sensor current; 80 dB PSRR rejects switching noise from nearby DC-DC converter. |
| Tablet PMIC Auxiliary Rail | Smartphone Audio Codec Bias |
|
Use Scenario: Generating dedicated 3.3 V rail for touch controller and haptic driver in thin tablet design. IC Role / Device Role / Timing Role: Secondary LDO decoupled from main PMIC, enabling independent power gating. Use Value: STSTAMP™ footprint saves >0.2 mm² vs. 0603 regulators; 200 mV dropout allows use of partially discharged battery. |
Use Scenario: Powering DAC/ADC section of audio codec during voice call with minimal background hiss. IC Role / Device Role / Timing Role: Ultra-low-noise LDO isolating sensitive analog audio path from noisy system rails. Use Value: 45 µVRMS noise directly translates to >105 dB SNR; 0.47 µF ceramic support simplifies layout near codec IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B332MR-G | 3.3 V fixed, 200 mA, 150 mV dropout, 1 µA IQ, no discharge MOSFET, SOT-25 package (2.9 × 2.8 mm²) | Larger footprint; lacks output discharge; better IQ but lower PSRR (60 dB @ 1 kHz) | Choose when board space permits larger package and discharge function is unnecessary. |
| Richtek RT9080AL-33PU5 | 3.3 V fixed, 300 mA, 250 mV dropout, 25 µA IQ, no discharge, DFN-6 (1.5 × 1.5 mm²) | Higher current rating but larger size than STSTAMP™; no auto-discharge; 10× bigger footprint | Prefer when >200 mA peak load is expected and STSTAMP™ size constraint is relaxed. |
Compared with XC6210B332MR-G and RT9080AL-33PU5, the LDBL20D-33R uniquely combines STSTAMP™ ultra-miniaturization, integrated output discharge, and 80 dB PSRR-making it optimal for space- and noise-sensitive battery-powered imaging and wearables where rapid power-down sequencing is required.
Availability
LDBL20D-33R is available at Aetrix Electronics and suitable for wearable health monitors, digital still cameras, and portable media players requiring stable component supply, long battery runtime, and ultra-compact packaging.
Supply support for LDBL20D-33R 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog products for automotive, industrial, and consumer markets.
The LDBL20 series belongs to ST's ultra-low-power LDO portfolio, engineered specifically for miniaturized, battery-operated portable electronics demanding sub-µA shutdown current, ceramic-capacitor stability, and sub-0.5 mm² footprint.
FAQ
What is the minimum output capacitor required for stable operation of LDBL20D-33R?
The LDBL20D-33R is stable with a minimum effective output capacitance of 220 nF, but ST recommends ≥0.47 µF ceramic (X5R/X7R) for robustness across temperature, input voltage, and load variations. Stability is guaranteed within the defined COUT/ESR region shown in Figure 17 of DS11244.
Does LDBL20D-33R include output voltage discharge functionality?
Yes-the "D" suffix in LDBL20D-33R indicates inclusion of the optional integrated discharge MOSFET. When EN is pulled low, this MOSFET actively discharges the output capacitor to GND, eliminating residual voltage and supporting precise power sequencing.
What is the thermal shutdown threshold and hysteresis behavior?
Thermal shutdown activates at 160 °C junction temperature with 20 °C hysteresis. Once triggered, the device disables output until junction temperature falls below 140 °C, then resumes normal operation automatically-no external reset required.
Can LDBL20D-33R operate with input voltage below 1.5 V?
No-absolute maximum ratings specify VIN ≥ –0.3 V, but functional operation requires VIN ≥ 1.5 V per electrical characteristics. At 3.3 V output, minimum valid input is 3.5 V (VOUT + VDROP ≈ 3.3 V + 0.2 V), and operation below 1.5 V is not characterized or guaranteed.
LDBL20D-33R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 4-XFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 55dB (1kHz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-STSTAMP (0.47x0.47)
LDBL20D-33R FAQ
1.How can I place an order for LDBL20D-33R through Aetrix?
Please submit a Request for Quotation (RFQ) for LDBL20D-33R 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 LDBL20D-33R reliable?
The price and inventory of LDBL20D-33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDBL20D-33R is usually 5 days.
3.What payment methods are accepted for LDBL20D-33R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDBL20D-33R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDBL20D-33R?
LDBL20D-33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDBL20D-33R 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 LDBL20D-33R?
For technical support, including LDBL20D-33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDBL20D-33R requirements.
6.How does Aetrix verify that LDBL20D-33R is sourced from the original manufacturer or authorized distributors?
All LDBL20D-33R 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 LDBL20D-33R meets industry standards.
7.What is the process for return or replacement of LDBL20D-33R?
All LDBL20D-33R units undergo pre-shipment inspection (PSI). If there is an issue with LDBL20D-33R, 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 LDBL20D-33R part is unused and in its original packaging.
Return procedure for LDBL20D-33R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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