S-8357B60MC-NJTT2G

Voltage - Supply (Vcc/Vdd):	0.9 V ~ 10 V
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	83%
Frequency - Switching:	100kHz
Series:	--
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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The S-8357B60MC-NJTT2G is a Low Voltage Step-Down DCDC Switching Controller. It is commonly used in precision current-mode, synchronous step-down voltage regulator applications. It features a wide input voltage range (5.5V - 20V) and an output voltage range adjustable from 0.8V to V_IN with external resistors. The controller offers better efficiency and transient responsiveness compared to conventional non-synchronous products.Features and BenefitsThe S-8357B60MC-NJTT2G DCDC Switching Controller offers several features and benefits:• Fast Transients: The proprietary current-mode control provides fast transient response and improved system performance in applications with heavy load steps and/or fast line transients.• Constant On-Time Control: The integrated e-loop controller use a constant on-time (COT) control method to provide fast response and improved efficiency.• Integrated FETs: The integrated high current power FETs provide superior efficiency and reduced component count.• Output Voltage Accuracy: The high voltage accuracy (1%) of the output voltage is guaranteed by an external resistor divider.• Comprehensive Protection: The controller provides protection features such as under-voltage lockout, over-voltage protection, and over-current protection.• Low Quiescent Current: The quiescent current is low in both active and standby modes. ApplicationsThe S-8357B60MC-NJTT2G DCDC Switching Controller is suitable for a wide range of applications such as low power point of load converters (POL), servers, desktops and adapters. Some of the typical applications include notebook adapter, adapter for peripheral devices, DCDC converter for camera modules, active OR gate converters, and PoE applications.Working PrincipleThe S-8357B60MCNJTT2G DCDC Switching Controller has a current-mode architecture for maximum load and line transient response. The on-time of the internal control loop is set by a current proportional to the sensed output voltage. The current sources avoid steady-state oscillations and also minimize the output voltage regulation errors. The COT control method is also employed to reduce the switching losses and noise and maximize efficiency.The device includes protection features like under-voltage lockout, over-voltage protection, and over-current protection. The UVLO threshold is adjustable with an external resistor. The OVP threshold is adjustable with both the resistor divider and the supply voltage sense pin. The OCP threshold is adjustable with an external resistor. The thermal protection is also included in the package.The S-8357B60MC-NJTT2G DCDC Switching Controller also provides an enable pin and a soft-start capability to reduce surge current during startup. The enable pin allows the user to shut down the device by using a logic high voltage. The soft start function can be configured by changing the capacitor connected to the soft start pin.In addition, the S-8357B60MC-NJTT2G DCDC Switching Controller provides a power good (PG) output to indicate the output voltage is within the specified tolerance. It also includes a reference output to connect an opto-coupler for system reliability and accuracy. The reference output pin is also used as a slope compensation pin to adjust the gain of the ramp generator.The S-8357B60MC-NJTT2G DCDC Switching Controller is a complete control solution for a wide range of applications (notebook adapter, active OR gate converters, PoE applications, etc). It offers improved efficiency, fast load step response, and on-time control for reduced switching losses. It also provides low standby current, good output voltage accuracy, and comprehensive protection features.

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