BD9851EFV-E2 Integrated Circuits (ICs)

Frequency - Switching:	10kHz ~ 3MHz
Base Part Number:	BD9851
Supplier Device Package:	20-HTSSOP-B
Package / Case:	20-VSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 18 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck, Boost
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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BD9851EFV-E2: DC DC Switching Controllers

DC DC Switching Controllers are a type of integrated circuit designed to control the output voltage of a power supply system. The BD9851EFV-E2 is one of the most popular controllers used for this purpose. The purpose of a DC DC Switching Controller is to assure the precise output voltage level of a DC power conversion circuit, usually by controlling the pulse width of a switching regulator such as a buck-boost converter or a step-up/step-down regulator. It can be used to generate the output voltage level from input voltages ranging from an individual cell of a Li-ion battery up to a wide range of mains voltage sources.The BD9851EFV-E2 is a high-performance, high-efficiency monolithic DC/DC converter, providing precise, adjustable output voltage and current limit features. The controller is optimized for rapidly changing load conditions, allowing for more efficient and cost-effective designs. The BD9851EFV-E2 features a unique predictive and adaptive on-time regulation circuit, providing consistent regulation and performance while protecting against short-circuit and overtemperature conditions. The device has many advanced features to support a wide variety of applications. The BD9851EFV-E2 is designed for applications such as notebook and smart phones, gaming systems, and LCD TVs, providing higher efficiency and better output stability. It can be used as a battery charger for laptop/ notebook/ tablet computers and cellular/smart phones. Additionally, the BD9851EFV-E2 can be used as an SSL LED driver, or as part of a LED torch, LED bulbs, LED screens and LED driver boards.The working principle of the BD9851EFV-E2 is fairly simple. It is essentially an on/off switch, with the on/off being controlled by the duty cycle of the pulse width modulated (PWM) signal output. This duty cycle is adjusted through the output voltage control pin to match the specified output voltage. As the output voltage is lowered, the duty cycle is automatically reduced and vice versa. The BD9851EFV-E2 has two pins- input and output- and two modes of operation, namely standby and on. In standby mode, the device shuts off all its internal circuitry, allowing only the minimum power drain necessary to maintain its operating state. In the on mode, the device functions as a PWM regulator by controlling the on/off time of its internal switch.The BD9851EFV-E2 is also fitted with a number of protection features to ensure that the power conversion system remains safe and reliable. It can protect against over-current, over-temperature, over-voltage and short-circuit conditions. Additionally, it is designed with a LED indicator, allowing the user to monitor the status of the system.In summary, the BD9851EFV-E2 is a high performance, high efficiency monolithic DC/DC converter, providing precise, adjustable output voltage and current limit features. It is designed for applications such as notebook and smart phones, gaming systems, and LCD TVs, providing higher efficiency and better output stability. The simple working principle of the device and its protection features make it an ideal choice for power conversion systems.

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