The L4959 parts manufactured by STMicroelectronics are available for purchase at Autoecuchips.com. Here you can find various types and values of electronic parts from the world's leading manufacturers. The L4959 components of Autoecuchips.com are carefully chosen, undergo stringent quality control, and are successfully meet all required standards.
The production status marked on Autoecuchips.com is for reference only. If you didn't find what you were looking for, you can get more valuable information by emails, such as the L4959 Inventory quantity, preferential price, datasheet, and manufacturer. We are always happy to hear from you, so feel free to contact us.
- **Features**:
- Monolithic Multifunction Voltage Regulator
- Four outputs: 12V/1.3A, 12V/0.8A, 8.6V/0.6A, 5.6V/0.25A
- 5.6V output is an unswitched linear regulator for microprocessor power supply
- 12V(a), 12V(b), and 8.6V outputs are switched regulators with independent enable control
- Supports Stand-by Mode; individual output control via EN pins
- Short-circuit protection (to ground)
- Thermal shutdown protection
- Low quiescent current: 8 mA (typical)
Technical Specifications
- **Input voltage range**: 14.4 V to 21.6 V (with load), 15 V to 30 V (no load)
- **Maximum input voltage**: 35 V
- **Output voltage 1 (OUT 5.6V)**: 5.6 V / 250 mA (unswitched linear regulator)
- **Output voltage 2 (OUT 8.6V)**: 8.6 V / 600 mA (switched regulator)
- **Output voltage 3 (OUT 12V(a))**: 12 V / 800 mA (switched regulator)
- **Output voltage 4 (OUT 12V(b))**: 12 V / 1.3 A (switched regulator)
- **Quiescent current**: 8 mA (typical)
- **Output noise voltage**: 200 µV (typical), 400 µV (max) @ 100 Hz–20 kHz
- **Supply Voltage Rejection (SVR)**: 55 dB (typical) @ 100 Hz; 40 dB (typical) @ 10 kHz
- - **Switch Turn-on Threshold**: 2.31 V (min), 3.5 V (typ)
- **Switch Turn-off Threshold**: 1.5 V (min), 2.11 V (typ)
- **Switch Hysteresis**: 200 mV (typ)
- **12V(b) Dropout Voltage**: 2.15 V (typ), 2.7 V (max) @ 1.3 A
- **12V(b) Current Limit**: 1.3 A (min), 1.7 A (max)
- **12V(b) Line Regulation**: 10 mV (typ), 50 mV (max)
- **12V(b) Load Regulation**: 200 mV (typ), 450 mV (max)
- **Operating Temperature Range**: 0°C to +70°C
- **Storage Temperature Range**: -40°C to +150°C
- **Junction-to-Case Thermal Resistance (Rth j-case)**: 2 °C/W
- **Package Type**: Multiwatt-11 (11-pin through-hole, with heatsink tab)
- **Mounting Style**: Through-hole; heatsink tab (TAB) connected to Pin 6 (GND)
- **RoHS Status**: Lead-free / RoHS compliant
- **Product Lifecycle**: Obsolete (available only via existing stock channels)
Notes
- **Compatibility**: Please verify compatibility with your application before purchasing. - Package/Footprint: Multiwatt-11 (11-pin through-hole with heatsink tab); verify PCB mounting hole positions and pin pitch.
- Input Voltage: 14.4V–21.6V (under load); ensure external power supply stability.
- Output Current: Varies by channel; ensure loads do not exceed rated values.
- Temperature Range: 0°C to +70°C (commercial grade); ensure the operating environment matches specifications.
- Enable Control: High level (>2.31V) on the EN pin activates the corresponding output; low level (<1.5V) disables it.
- Thermal Design: The TAB pad connects to Pin 6 (GND); a heatsink with thermal grease is required.
- **Installation Instructions**:
- ESD Protection: The chip is sensitive to static electricity; wear an anti-static wrist strap before handling.
- Soldering Temperature: Control temperature and duration during manual soldering to avoid damaging internal circuitry.
- Heatsink Installation: The TAB pad must be connected to the heatsink with thermal grease; use appropriate torque when tightening screws.
- Decoupling Capacitors: Connect appropriate filtering capacitors in parallel with each output (e.g., 100µF electrolytic + 0.1µF ceramic).
- Input Filtering: Connect a high-capacity electrolytic capacitor (e.g., 2200µF/35V) in parallel with the VS pin.
- Enable Pin: Connect the EN pin to a microprocessor control signal to implement standby mode.
- Operate the device within the specified temperature range.
- **Troubleshooting**:
- No output on a channel: Check if the corresponding EN pin voltage is >2.31V and if the input voltage is within range.
- Low output voltage: Check if load current exceeds ratings, verify heat dissipation, and check for insufficient input voltage.
- Chip overheating: Check heatsink installation and load current; verify if the ambient temperature exceeds 70°C.
- Frequent short-circuit protection triggering: Check for output-to-ground shorts or abnormal load conditions.
- Excessive noise: Check the condition and ESR of output filter capacitors. Is it too high?
- **Alternative Model References**:
- L4943 (Multifunction voltage regulator for car audio)
- L4953 (Multifunction voltage regulator for car audio)
- L4953K (Multifunction voltage regulator for car audio)
- L5956 (Multifunction voltage regulator for car audio)
- L5957 (Multifunction voltage regulator for car audio)
- L5958 (Multifunction voltage regulator for car audio)
- L5959 (Multifunction voltage regulator for car audio)
- LA5668 (Sanyo multifunction voltage regulator)
- Selection of an alternative model should be based on specific requirements for output voltage, current, and package type.
- **Technical Support**: If further technical support is required, it is recommended to contact STMicroelectronics or a professional audio/automotive electronics repair service.
Summary
The L4959 is a multifunction voltage regulator manufactured by STMicroelectronics, housed in a Multiwatt-11 package. Its four outputs—a 5.6V/250mA always-on linear regulator, an 8.6V/600mA switching regulator, a 12V/800mA switching regulator, and a 12V/1.3A switching regulator—combined with independent enable control functions, make it an ideal power management solution for home and automotive audio systems. The chip supports standby mode, short-circuit protection, and thermal shutdown protection, and is widely used in audio equipment such as CD players and power amplifiers from brands like JVC and Sony. As the chip has been discontinued, replacements must be sourced from existing inventory. When replacing the chip, key design factors such as package compatibility (Multiwatt-11), thermal design (TAB connected to Pin 6 GND), input voltage range, output current limits for each channel, and enable control logic must be considered to ensure stable system operation.
Welcome to our shop!
Dear friends, if you are very interested and want to order a large number, you can contact us through Whatsapp, Wechat, email or Skype, and we will reply to you within 24 hours.
Product Description:
1.The picture only supplies the reference It may not be the exact one as in our stock because of difr NO.
2.We will ship the items within 3 working days after the payment is reached.
3.When the parts arrive at your local customs, if the parts are charged with customs duties, we are not responsible for any customs duties or import taxes.
REFUNDS & RETURN:
We offer a warranty on all items that we sold. Item will be tested before ship, it will be in good condition, if there are some problems with the item, feel free to contact us.
You must contact us before returning any product . Return must be in new condition (Buyer should return all original and undamaged items under re-saleable condition).
Return the goods and the buyer is responsible for all expenses!!
If you are satisfied with our products, please give positive feedback. Thank you for your help. If you are not satisfied, please let us know. Your constructive suggestions will become the driving force for our modification and improvement. Thanks for your understanding.
