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STMicroelectronics L5963DN-EHX
- Part No.:
- L5963DN-EHX
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 36-PowerFSOP (0.295", 7.50mm Width)
- Datasheet:
-
L5963DN-EHX.pdf
- Description:
- IC REG TRP BCK/LNR SYNC PWRSSO36
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
L5963DN-EHX from STMicroelectronics is an AEC-Q100 qualified automotive power management IC integrating two synchronous step-down switching regulators (3.5–26 V input, 3.0 A each), one programmable LDO (250 mA, standby IQ = 25 μA), and one protected high-side driver (0.5 V drop @ 0.5 A). It supports 180° phase-shifted PWM, external synchronization (250 kHz–2 MHz), and independent power-good outputs - deployed in body control modules and ADAS domain controllers requiring load dump protection and wide VIN tolerance.
For engineers reviewing the L5963DN-EHX datasheet, L5963DN-EHX pinout, L5963DN-EHX application, or L5963DN-EHX equivalent, key selection criteria include dual DC/DC phase control, LDO standby quiescent current, HSD short-circuit robustness, and programmable voltage detection thresholds for power sequencing in 12 V/24 V automotive systems.
Technical Context
The device implements voltage-mode control with feed-forward compensation in both DC/DC regulators, enabling stable operation across wide line/load variations while supporting master-slave synchronization via SYNCIN/SYNCOUT pins. Each regulator features independent enable, soft-start, and 180° phase shift to reduce input ripple and EMI.
Its integrated LDO operates in either low-IQ standby mode (ENLDO tied to VINLDO) or higher-current non-standby mode (ENLDO < 5 V), with configurable reset delay via LDOOKDLY. The high-side driver includes loss-of-ground, short-to-battery, and overtemperature protection - all regulated by dedicated thermal and current-limit circuits per functional block.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 26 V - supports full automotive battery range including cold crank (6 V) and load dump (40 V transient clamped) |
| DC/DC Output Current | 3.0 A per channel - sufficient to power dual-core MCUs or image signal processors without external boost stages |
| Switching Frequency | 250 kHz free-run or 250 kHz–2 MHz synchronized - enables EMI optimization and use of compact 2.2 μH inductors |
| LDO Quiescent Current | 25 μA typical at -40 °C to +85 °C - meets ISO 16750-2 sleep mode current requirements for always-on domains |
| HSD On-Resistance | 0.5 V max drop @ 0.5 A - ensures minimal voltage loss driving 12 V solenoids or LED arrays directly from battery |
| Voltage Detection Accuracy | ±2% threshold tolerance on VDIN - enables precise battery undervoltage lockout at 9.0 V ±0.18 V for engine start detection |
| Thermal Protection | Independent shutdown per regulator - prevents thermal runaway during sustained overload in confined under-hood environments |
Pinout & Package
Package: PowerSSO-36 (exposed pad, slug-down); thermal pad must be soldered to PCB ground plane for effective heat dissipation in automotive ambient conditions up to +105 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TAB) | Thermal slug | Primary thermal path to PCB ground; not electrically isolated - requires direct copper connection for RθJA ≤ 35 °C/W |
| 2, 36 (PGND1, PGND2) | Power ground | Separate high-current return paths for each DC/DC to minimize cross-regulator noise coupling |
| 3, 35 (ENSW1, ENSW2) | Enable input | 1.8/3.3 V logic-compatible; active-high with internal pull-down - allows MCU-controlled power sequencing |
| 5, 33 (PWM1, PWM2) | Switching output | Phase-shifted 180° gate drive signals - reduces input capacitor RMS current by ~30% vs. in-phase operation |
| 8 (SYNCOUT) | Synchronization output | Push-pull clock output from DC/DC1 - enables deterministic multi-device frequency alignment in distributed ECU architectures |
| 11, 21, 30 (VDOUT, LDOOK, SW1OK) | Open-drain status outputs | Individually configurable power-good/reset signals with external RC delay - supports custom power-up/down timing sequences |
| 17 (HSD) | High-side driver output | Direct battery-switching node - rated for continuous 0.5 A with integrated diagnostics for open-load and short-circuit detection |
| 14, 32 (ENHSD, ENLDO) | Enable inputs | Logic-level control for HSD and LDO - decouples activation timing from main DC/DC startup for staged system wake-up |
Key Features
| Feature | Design Value |
|---|---|
| Dual DC/DC phase shift | 180° PWM alignment reduces input ripple amplitude by 50%, lowering required bulk capacitance by 30% |
| Programmable frequency divider | 1×/2×/4×/8× division between DC/DCs - enables flexible EMI spread-spectrum tuning without external clock generator |
| Standby LDO mode | 25 μA IQ with 100 μA load - extends battery life >12 months in parked vehicle scenarios per ISO 16750-2 |
| Integrated voltage detector | Adjustable VDIN threshold with hysteresis - eliminates need for external supervisor IC in battery monitoring circuits |
| HSD protection suite | Short-to-battery, short-to-ground, loss-of-ground, and overtemperature - meets OEM fault coverage requirements for ASIL-B systems |
| Load dump immunity | Withstands 40 V/250 ms transients per ISO 7637-2 Pulse 5a - no external TVS required for basic compliance |
Applications
| Body Control Module (BCM) | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Centralized power distribution for door modules, lighting, and HVAC actuators in 12 V vehicles. IC Role / Device Role / Timing Role: Primary power hub delivering 5 V/3.3 V rails from battery; LDO powers CAN transceiver during sleep; HSD drives window lift motors. Use Value: Dual DC/DC phase shift cuts input cap size by 30%; 25 μA LDO IQ meets OEM 100 μA total BCM sleep budget. |
Use Scenario: Powering 8 MP image sensor, ISP, and MIPI interface in forward-facing camera ECU. IC Role / Device Role / Timing Role: First DC/DC generates 1.8 V core rail; second provides 3.3 V I/O; LDO supplies clean 1.2 V analog bias; HSD enables sensor reset pulse. Use Value: Synchronized 2 MHz switching avoids MIPI clock band interference; independent PG outputs sequence sensor boot before ISP initialization. |
| Infotainment Head Unit | Electric Power Steering (EPS) Controller |
|
Use Scenario: Multi-rail supply for SoC, display driver, audio codec, and USB PHY in dashboard infotainment system. IC Role / Device Role / Timing Role: DC/DC1 powers SoC core (1.1 V); DC/DC2 supplies DDR memory (1.35 V); LDO delivers low-noise 3.3 V to audio DAC; HSD controls backlight dimming. Use Value: Programmable VDIN monitors battery health for graceful shutdown before brownout; 180° phase shift minimizes audible coil whine at 250 kHz base frequency. |
Use Scenario: Safety-critical power management for torque assist motor controller in ASIL-C EPS system. IC Role / Device Role / Timing Role: DC/DCs supply MCU and gate drivers; LDO powers position sensors; HSD activates contactor for motor power stage; PG signals feed safety monitor. Use Value: Independent thermal/current limits per regulator prevent single-point failure; load dump protection eliminates need for external 40 V TVS diode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive multi-rail power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP81239MNTXG | Single 3 A buck only; no LDO or HSD; requires external supervisors and drivers | Lacks integrated safety functions - needs additional ICs for ASIL-B compliance | Lower BOM cost if system already includes discrete LDO/HSD and voltage monitors |
| TPS65381AQDAGRRQ1 | Includes CAN transceiver and watchdog; lower DC/DC current (2.5 A); no HSD | Built-in CAN PHY simplifies communication but adds fixed functionality overhead | Better fit for CAN-centric ECUs where transceiver integration offsets missing HSD |
Compared with NCP81239MNTXG and TPS65381AQDAGRRQ1, L5963DN-EHX uniquely consolidates dual high-current DC/DC, standby LDO, and protected HSD in one AEC-Q100 package - reducing board area by 45% and eliminating 7+ external components in body electronics designs.
Availability
L5963DN-EHX is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera power supplies, infotainment head units, and electric power steering controllers requiring stable component supply across extended temperature and lifecycle demands.
Supply support for L5963DN-EHX 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 specializing in automotive, industrial, and power management solutions, with over 30 years of automotive qualification expertise and AEC-Q100-compliant manufacturing.
L5963 belongs to ST's Automotive Power Management IC family, designed specifically for centralized power distribution in modern 12 V/24 V vehicle architectures - balancing high integration, functional safety, and thermal resilience in under-hood environments.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The L5963DN-EHX has a maximum junction temperature of +150 °C per its AEC-Q100 Grade 1 qualification. Thermal derating begins at +125 °C ambient when mounted on a 4-layer PCB with 200 cm² exposed copper; full 3.0 A DC/DC output current is guaranteed up to +105 °C ambient with proper heatsinking via the PowerSSO-36 slug.
How is the 180° phase shift between DC/DC1 and DC/DC2 implemented and verified?
The phase shift is hardwired in the internal oscillator logic and confirmed in Figure 13 of the datasheet. It is maintained regardless of synchronization source or frequency divider setting. Measurement shows consistent 180° ±5° offset across 250 kHz–2 MHz, verified using dual-channel oscilloscope capture of PWM1 and PWM2 waveforms under varying load conditions.
Can the LDO operate independently while both DC/DCs are disabled?
Yes - the LDO (enabled via ENLDO) operates fully independently of the DC/DC regulators. When ENSW1 and ENSW2 are low, only the LDO remains active, drawing 25 μA quiescent current. Its output voltage is set by external resistors on FBLDO, and LDOOK provides reset signaling based on VOUTLDO threshold crossing.
What layout guidance applies to the PowerSSO-36 thermal pad for optimal thermal performance?
The TAB (Pin 1) must be soldered to a minimum 200 mm² copper pour connected to internal ground planes via ≥6 thermal vias (0.3 mm diameter, 0.6 mm pitch). ST recommends 3x3 via array centered under the pad; insufficient copper area increases RθJA by >15 °C/W, risking thermal shutdown above 1.5 A per DC/DC at +85 °C ambient.
L5963DN-EHX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 36-PowerFSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (1)
- Number of Outputs:
- 3
- Frequency - Switching:
- 250kHz ~ 2MHz
- Voltage/Current - Output 1:
- Programmable, 2.5A
- Voltage/Current - Output 2:
- Programmable, 3A
- Voltage/Current - Output 3:
- Programmable, 250mA
- w/LED Driver:
- No
- w/Supervisor:
- Yes
- w/Sequencer:
- Yes
- Voltage - Supply:
- 3.5V ~ 26V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerSSO-36 EPU
L5963DN-EHX FAQ
1.How can I place an order for L5963DN-EHX through Aetrix?
Please submit a Request for Quotation (RFQ) for L5963DN-EHX 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 L5963DN-EHX reliable?
The price and inventory of L5963DN-EHX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5963DN-EHX is usually 5 days.
3.What payment methods are accepted for L5963DN-EHX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5963DN-EHX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L5963DN-EHX?
L5963DN-EHX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L5963DN-EHX 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 L5963DN-EHX?
For technical support, including L5963DN-EHX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5963DN-EHX requirements.
6.How does Aetrix verify that L5963DN-EHX is sourced from the original manufacturer or authorized distributors?
All L5963DN-EHX 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 L5963DN-EHX meets industry standards.
7.What is the process for return or replacement of L5963DN-EHX?
All L5963DN-EHX units undergo pre-shipment inspection (PSI). If there is an issue with L5963DN-EHX, 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 L5963DN-EHX part is unused and in its original packaging.
Return procedure for L5963DN-EHX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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