SCT2430STER产品规格书pdf资源-CSDN文库

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SCT2430

Rev.1.3

Product Folder Links: SCT2430

SILICON CONTENT

TECHNOLOGY

100

1 10 100 1000 10000

Efficiency(%)

Output Current(mA)

VIN=24V,VOUT=3.3V

VIN=24V,VOUT=5V

VIN=12V,VOUT=5V

VIN=12V,VOUT=3.3V

3.8V-40V Vin, 3.5A, High Efficiency Synchronous Step-down DCDC

Converter with Programmable Frequency

FEATURES

• Wide Input Range: 3.8V-40V

• Up to 3.5A Continuous Output Current

• 0.8V ±1% Feedback Reference Voltage

• Integrated 80mΩ High-Side and 50mΩ Low-Side

Power MOSFETs

• Pulse Skipping Mode (PSM) with 25uA Quiescent

Current in Sleep Mode

• 100ns Minimum On-time

• 2ms Internal Soft-start Time

• Adjustable Frequency 100KHz to 2.2MHz

• External Clock Synchronization

• Frequency Spread Spectrum (FSS) Modulation for

EMI Reduction

• Precision Enable Threshold for Programmable

Input Voltage Under-voltage Lock Out Protection

(UVLO) Threshold and Hysteresis

• Low Dropout Mode Operation

• Derivable Inverting Voltage Regulator

• Over-voltage and Over-Temperature Protection

• Available in an ESOP-8 Package

APPLICATIONS

• Battery Pack Powered System - Cordless Power

Tools, Cordless Home Appliance, Drone, Aero

Modeling, GPS Tracker etc.

• Cigarette Lighter Adapters, Chargers

• LCD Display

• USB Type-C Power Delivery, USB Charging

• Industrial and Medical Distributed Power Supplies

• Optical Communication and Networking System

• Automotive System

DESCRIPTION

The SCT2430 is 3.5A synchronous buck converters

with wide input voltage, ranging from 3.8V to 40V,

which integrates an 80mΩ high-side MOSFET and a

50mΩ low-side MOSFET. The SCT2430, adopting the

peak current mode control, supports the Pulse Skipping

Modulation (PSM) with typical 25uA low quiescent

current which assists the converter on achieving high

efficiency at light load or standby condition.

The SCT2430 features programmable switching

frequency from 100 kHz to 2.2MHz with an external

resistor, which provides the flexibility to optimize either

efficiency or external component size. The converter

supports external clock synchronization with a

frequency band from 100kHz to 2.2MHz. The SCT2430

allows power conversion from high input voltage to low

output voltage with a minimum 100ns on-time of high-

side MOSFET.

The SCT2430 is an Electromagnetic Interference (EMI)

friendly buck converter with implementing optimized

design for EMI reduction. The SCT2430 features

Frequency Spread Spectrum FSS with ±6% jittering

span of the switching frequency and modulation rate

1/512 of switching frequency to reduce the conducted

EMI.

The SCT2430 offers cycle-by-cycle current limit and

hiccup over current protection, thermal shutdown

protection, output over-voltage protection and input

voltage under-voltage protection. The device is

available in an 8-pin thermally enhanced SOP-8

package.

TYPICAL APPLICATION

BOOT

VIN

RT/CLK

GND

COMP

SCT2430

C1 C2

OUT

SCT2430

Product Folder Links: SCT2430

REVISION HISTORY

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Revision 1.0: Released to Market

Revision 1.1: Updated Description

Revision 1.2: Updated Table 3

Revision 1.3: Updated Figure 1. SCT2430 Design Example and Table 3: Compensation Values

DEVICE ORDER INFORMATION

PART NUMBER

PACKAGE MARKING

PACKAGE DISCRIPTION

SCT2430STE

2430

8-Lead Plastic ESOP

1) For Tape & Reel, Add Suffix R (e.g. SCT2430STER)

ABSOLUTE MAXIMUM RATINGS

Over operating free-air temperature unless otherwise noted

(1)

PIN CONFIGURATION

DESCRIPTION

MIN

MAX

UNIT

GND

4 5

BOOT

VIN

RT/CLK

COMP

Thermal

PAD

Figure 2. 8-Lead Plastic E-SOP

VIN, EN

-0.3

BOOT

-0.3

BOOT-SW

-0.3

COMP, FB, RT/CLK

-0.3

Operating junction temperature TJ

(2)

-40

150

°C

Storage temperature TSTG

-65

150

°C

(1) Stresses beyond those listed under Absolute Maximum Rating may cause device permanent damage. The device is not guaranteed to

function outside of its Recommended Operation Conditions.

(2) The IC includes over temperature protection to protect the device during overload conditions. Junction temperature will exceed 150°C

when over temperature protection is active. Continuous operation above the specified maximum operating junction temperature will

reduce lifetime.

PIN FUNCTIONS

NAME

NO.

PIN FUNCTION

BOOT

Power supply bias for high-side power MOSFET gate driver. Connect a 0.1uF capacitor

from BOOT pin to SW pin. Bootstrap capacitor is charged when low-side power

MOSFET is on or SW voltage is low.

VIN

Input supply voltage. Connect a local bypass capacitor from VIN pin to GND pin. Path

from VIN pin to high frequency bypass capacitor and GND must be as short as possible.

Enable pin to the regulator with internal pull-up current source. Pull below 1.1V to

disable the converter. Float or connect to VIN to enable the converter. The tap of resistor

divider from VIN to GND connecting EN pin can adjust the input voltage lockout

threshold.

RT/CLK

Set the internal oscillator clock frequency or synchronize to an external clock. Connect

a resistor from this pin to ground to set switching frequency. An external clock can be

input directly to the RT/CLK pin. The internal oscillator synchronizes to the external

clock frequency with PLL. If detected clocking edges stops, the operation mode

automatically returns to resistor programmed frequency.

SCT2430

Product Folder Links: SCT2430

Inverting input of the trans-conductance error amplifier. The tap of external feedback

resistor divider from the output to GND sets the output voltage. The device regulates

FB voltage to the internal reference value of 0.8V typical.

COMP

Error amplifier output. Connect to frequency loop compensation network.

GND

Ground

Regulator switching output. Connect SW to an external power inductor

Thermal

Pad

Heat dissipation path of die. Electrically connection to GND pin. Must be connected to

ground plane on PCB for proper operation and optimized thermal performance.

RECOMMENDED OPERATING CONDITIONS

Over operating free-air temperature range unless otherwise noted

PARAMETER

DEFINITION

MIN

MAX

UNIT

Input voltage range

3.8

OUT

Output voltage range

0.8

Operating junction temperature

-40

125

°C

ESD RATINGS

PARAMETER

DEFINITION

MIN

MAX

UNIT

ESD

Human Body Model(HBM), per ANSI-JEDEC-JS-001-2014

specification, all pins

(1)

-2

Charged Device Model(CDM), per ANSI-JEDEC-JS-002-

2014 specification, all pins

(2)

-0.5

+0.5

(1) JEDEC document JEP155 states that 500V HBM allows safe manufacturing with a standard ESD control process.

(2) JEDEC document JEP157 states that 250V CDM allows safe manufacturing with a standard ESD control process.

THERMAL INFORMATION

PARAMETER

THERMAL METRIC

SOP-8L

UNIT

θJA

Junction to ambient thermal resistance

(1)

°C/W

θJC

Junction to case thermal resistance

(1)

45.8

(1) SCT provides R

θJA

and R

θJC

numbers only as reference to estimate junction temperatures of the devices. R

θJA

and R

θJC

are not a

characteristic of package itself, but of many other system level characteristics such as the design and layout of the printed circuit

board (PCB) on which the SCT2430 is mounted, thermal pad size, and external environmental factors. The PCB board is a heat sink

that is soldered to the leads and thermal pad of the SCT2430. Changing the design or configuration of the PCB board changes the

efficiency of the heat sink and therefore the actual R

θJA

and R

θJC

ELECTRICAL CHARACTERISTICS

=24V, T

=-40°C~125°C, typical value is tested under 25°C.

SYMBOL

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

Power Supply

Operating input voltage

3.8

IN_UVLO

Input UVLO Threshold

rising

3.5

3.7

Hysteresis

400

SHDN

Shutdown current from VIN pin

EN=0, no load

μA

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