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STMicroelectronics ST619LBD
- Part No.:
- ST619LBD
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ST619LBD.pdf
- Description:
- IC REG CHARGE PUMP 5V 30MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,272
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Product details
Overview
ST619LBD from STMicroelectronics is a regulated 5 V ±4 % charge pump DC-DC converter designed for low-noise, inductorless voltage boosting in battery-powered systems. It delivers up to 30 mA output current from a 2 V–3.6 V input (two-cell alkaline/NiMH), features logic-controlled shutdown (≤1 µA), and operates with only four external capacitors. It is used in portable medical monitors, handheld test equipment, and low-power sensor nodes requiring stable 5 V rail generation.
For engineers reviewing the ST619LBD datasheet, ST619LBD pinout, ST619LBD application, or ST619LBD equivalent, key selection criteria include guaranteed output current over temperature, shutdown load isolation, capacitor-based topology for EMI-sensitive designs, and SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
The ST619LBD employs a pulse-skipping controller to regulate output voltage at 5 V ±4 % across its full input range. Its internal charge pump dynamically switches between voltage-doubling (3.0–3.6 V input), voltage-tripling (2.0–2.5 V), and hybrid 2.5× mode (2.5–3.0 V) to maximize efficiency.
It uses two flying capacitors (C1/C2) and separate input/output bulk capacitors (C3/C4) to transfer energy without inductors. The SHDN pin is CMOS-compatible, active-high, and disconnects the load from input during shutdown - reducing supply current to ≤1 µA and forcing VO to 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5 V ±4 % - ensures TTL/CMOS logic compatibility and stable ADC reference under varying load and temperature. |
| Max Output Current | 30 mA @ VI ≥ 3 V - supports microcontroller peripherals, small LCD bias rails, or RS-232 level shifters. |
| Input Voltage Range | 2 V to 3.6 V - matches nominal voltage of two alkaline, NiMH, or Li-ion cells in series. |
| Shutdown Current | ≤1 µA - enables multi-year battery life in always-on sensing applications with periodic wake-up. |
| Switching Frequency | 500 kHz (full load) - allows use of small ceramic capacitors and minimizes conducted EMI in compact layouts. |
| Efficiency | 80–82 % @ IO = 20–30 mA - reduces thermal load and extends runtime versus linear regulators in portable devices. |
| No-Load Supply Current | 75–300 µA - balances quiescent power vs. startup speed for intermittent-use systems. |
Pinout & Package
ST619LBD is housed in an SO-8 surface-mount package (ECOPACK® compliant, lead-free, JEDEC-standard footprint). Pin layout supports standard PCB assembly and thermal management via exposed pad grounding (per mechanical data sheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C1+ | Positive flying capacitor terminal | Connects to positive side of first 0.22 µF charge pump capacitor; critical for energy transfer timing. |
| 2 IN | Main input supply | Accepts 2–3.6 V unregulated source; powers internal circuitry and charge pump stages. |
| 3 OUT | Regulated 5 V output | Delivers stabilized 5 V ±4 %; drops to 0 V when SHDN is high - isolates downstream circuitry. |
| 4 C2+ | Positive flying capacitor terminal | Connects to positive side of second 0.22 µF flying capacitor; works in tandem with C1+ for voltage multiplication. |
| 5 C2− | Negative flying capacitor terminal | Reference node for second flying capacitor; tied internally to switching node during charge/discharge phases. |
| 6 GND | Power and signal ground | Common return path for input, output, and control logic; must be low-impedance for ripple suppression. |
| 7 SHDN | Active-high shutdown control | CMOS-compatible input; logic high disables regulator and disconnects OUT from IN - no leakage path remains. |
| 8 C1− | Negative flying capacitor terminal | Reference node for first flying capacitor; alternates polarity with C2− during pump cycles. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic EMI sources and simplifies layout - ideal for RF-sensitive or ultra-thin portable designs. |
| Load-disconnect shutdown | SHDN high forces OUT to 0 V and breaks conductive path from IN to load - prevents backfeed and preserves battery integrity. |
| Input-voltage adaptive pumping | Automatically selects doubler/tripler/hybrid mode based on VI - maintains regulation and efficiency across full 2–3.6 V range. |
| Low-noise operation | Capacitor-based switching yields <100 mVpp ripple - suitable for analog front-ends and precision sensor interfaces. |
| SO-8 ECOPACK® packaging | Lead-free, RoHS-compliant, JEDEC-standard SO-8 footprint - ensures drop-in manufacturability and long-term supply continuity. |
Applications
| Portable Medical Sensors | Handheld Test Instruments |
|---|---|
Use Scenario: Battery-powered glucose meter with integrated 5 V ADC reference and display backlight driver. IC Role / Device Role / Timing Role: Generates clean, regulated 5 V rail from two AA cells to power analog signal chain and digital logic. Use Value: Eliminates inductor size and EMI concerns while maintaining ±4 % accuracy across battery discharge curve - ensuring consistent measurement fidelity. | Use Scenario: Pocket-sized multimeter with auto-ranging and LCD interface requiring stable 5 V supply. IC Role / Device Role / Timing Role: Supplies regulated 5 V to microcontroller, op-amp front-end, and segment driver ICs. Use Value: Delivers 30 mA at >80 % efficiency down to 2 V input - enabling full functionality even as batteries deplete to end-of-life. |
| Wireless Sensor Nodes | Low-Power Industrial I/O Modules |
Use Scenario: Zigbee-enabled temperature/humidity node powered by two CR2032 coin cells. IC Role / Device Role / Timing Role: Provides 5 V for RF transceiver bias and MCU I/O - activated only during transmission bursts. Use Value: ≤1 µA shutdown current extends multi-year battery life; fast start-up (<100 µs) supports duty-cycled operation. | Use Scenario: DIN-rail mounted analog input module converting 4–20 mA signals using isolated 5 V logic supply. IC Role / Device Role / Timing Role: Generates local 5 V rail for isolated ADC and digital isolator from 3.3 V system bus. Use Value: SO-8 package fits tight board spacing; low EMI avoids coupling into sensitive analog signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Unregulated 2× charge pump (±5 V dual output); no internal regulation or shutdown control. | Requires external feedback for regulation; lacks load-disconnect feature - unsuitable for battery preservation. | Select only if dual-rail generation is needed and regulation tolerance >±5 % is acceptable. |
| TPS60403DBVR | Regulated 5 V ±3.5 %; higher max output (60 mA); 1.2 MHz switching frequency; requires different capacitor values. | Better current capability and tighter regulation, but higher EMI and less efficient below 2.5 V input. | Prefer for higher-load applications where 2.5–3.6 V input dominates and board area allows larger caps. |
Compared with MAX680ESA+ and TPS60403DBVR, the ST619LBD uniquely balances low-quiescent shutdown, load-isolating shutdown, and adaptive pumping across the full 2–3.6 V range - making it optimal for ultra-low-power, single-rail, space-constrained battery systems.
Availability
ST619LBD is available at Aetrix Electronics and suitable for portable medical sensors, handheld test instruments, and wireless sensor nodes requiring stable component supply and long-term lifecycle support.
Supply support for ST619LBD 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, delivering innovative solutions across automotive, industrial, power, and consumer markets.
The ST619LBD belongs to ST's legacy low-power analog DC-DC converter portfolio, engineered specifically for inductorless, low-EMI voltage boosting in space- and battery-constrained portable electronics.
FAQ
What is the minimum input voltage required for ST619LBD to maintain 5 V regulation?
The ST619LBD maintains 5 V ±4 % regulation down to 2 V input across its full operating temperature range (–40 °C to +85 °C). At 2 V input, it guarantees 20 mA output current; regulation remains stable due to adaptive triple-mode charge pumping, confirmed in Electrical Characteristics Table 5 and Figure 9 of the datasheet.
Can ST619LBD drive a 100 mA load?
No - the ST619LBD is rated for maximum continuous output current of 30 mA at VI ≥ 3 V and 20 mA at VI ≥ 2 V. Attempting 100 mA exceeds absolute maximum ratings (IO = 120 mA is destructive limit per Table 3), causing thermal shutdown or permanent damage. For higher loads, consider a buck-boost regulator like ST1S14 or TPS63020.
Is external feedback required to regulate the output voltage?
No - the ST619LBD integrates an internal pulse-skipping regulator that maintains 5 V ±4 % without external feedback components. Regulation is achieved via on-chip comparator and oscillator control, as described in Section 3 "Operating principle" and verified in Figure 6 (VO vs IO) and Figure 9 (VO vs VI) of the datasheet.
Does ST619LBD support reverse current protection from output to input?
Yes - during shutdown (SHDN = high), the internal switch disconnects OUT from IN, and VO falls to 0 V. This provides true reverse current blocking, preventing battery drain through downstream loads. The datasheet explicitly states "Shut down disconnects load from input" and confirms ≤1 µA shutdown current in both text and Table 5 (ISHDN).
ST619LBD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 30mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ST619LBD FAQ
1.How can I place an order for ST619LBD through Aetrix?
Please submit a Request for Quotation (RFQ) for ST619LBD 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 ST619LBD reliable?
The price and inventory of ST619LBD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST619LBD is usually 5 days.
3.What payment methods are accepted for ST619LBD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST619LBD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST619LBD?
ST619LBD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST619LBD 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 ST619LBD?
For technical support, including ST619LBD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST619LBD requirements.
6.How does Aetrix verify that ST619LBD is sourced from the original manufacturer or authorized distributors?
All ST619LBD 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 ST619LBD meets industry standards.
7.What is the process for return or replacement of ST619LBD?
All ST619LBD units undergo pre-shipment inspection (PSI). If there is an issue with ST619LBD, 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 ST619LBD part is unused and in its original packaging.
Return procedure for ST619LBD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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