NCV8851-1: Automotive Average Current Mode Controller
The NCV8851-1 is an adjustable output, synchronous buck controller, which drives dual N-channel MOSFETs, ideal for high power applications. Average current mode control is employed for very fast transient response and tight regulation over wide input voltage and output load ranges. The IC incorporates an internal fixed 6.0 V low-dropout linear regulator (LDO), which supplies charge to the switch mode power supply's (SMPS) bottom gate driver, limiting the power lost to excess gate drive. The IC is designed for operation over a wide input voltage range (4.5 V to 40 V) and is capable of 10 to 1 voltage conversion at 500 kHz. Additional controller features include undervoltage lockout, internal soft start, low quiescent current sleep mode, programmable frequency, SYNC function, average current limiting, cycle-by-cycle overcurrent protection and thermal shutdown.
Features- Average current mode control
- 0.8 V 2% reference voltage
- Wide input voltage range of 4.5 V to 40 V
- 6.0 V low-dropout linear regulator (LDO)
- Input UVLO (Undervoltage Lockout)
- Internal soft-start
- 1.0 µA maximum quiescent current in sleep mode
- Adaptive non-overlap circuitry
- Programmable fixed frequency 170 kHz to 500 kHz
- External clock synchronization up to 600 kHz
- Average current limiting (ACL)
- Cycle-by-cycle overcurrent protection (OCP)
- Thermal shutdown (TSD)
| Benefits- Fast transient response and simple compensator design
- Tight tolerance on programmable output voltage
- Allows for direct regulation from car battery through load dump conditions
- Supplies internal supply for gate drivers
- Disables start-up in undervoltage conditions
- Lowers inrush current and avoids output overshoot during start-up
- Very low sleep current
- Protects against switch cross-conduction (shoot-through)
- Allows for design flexibility
- Allows for frequency synchronization and spread spectrum operation
- Limits current to protect devices
- Protects components in case of a short-circuit and recovers
- Thermally protects IC
|
Applications- Automotive systems requiring high current
- Pre-regulated supply for low-voltage SMPSs and LDOs
| End Products |
Simulation Models (1)
Data Sheets (1)
Evaluation Board Documents (5)
Package Drawings (1)
| Document Title | Document ID/Size | Revision |
|---|
| TSSOP-20 WB | 948E-02 (39.7kB) | D |
Evaluation/Development Tool Information
| Product | Status | Compliance | Short Description |
|---|
| NCV8851-1GEVB | Active | Pb-free | Adjustable Output Synchronous Buck Controller Evaluation Board |
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| NCV8851-1DBR2G | Active | AEC Qualified
PPAP Capable
Pb-free | TSSOP-20 | 948E-02 | 3 | Tape and Reel | 2500 | $1.3 |
Specifications
| Product | Topology | Phases | Control Mode | VCC Min (V) | VCC Max (V) | fSW Typ (kHz) | tres Typ (ns) |
|---|
| NCV8851-1DBR2G | Step-Down | | Current Mode | 4.5 | 40 | Up to 500 | |
