SCT2A27
Rev.1.1
For more information www.silicontent.com © 2021 Silicon Content Technology Co., Ltd. All Rights Reserved 1
Product Folder Links: SCT2A27
芯洲科技
Silicon Content Technology
5.5V-100V Vin, 4A Peak Current Limit, High Efficiency Asynchronous Step-
down DCDC Converter with a 200mA LDO Integrated
FEATURES
Wide Input Range: 5.5V-100V
Maximum Output Voltage: 30V
2A Continuous Output Current
4A Peak Current Limit
Integrated 500mΩ High-Side Power MOSFET
A 200mA LDO Integrated, 5V or 3.3V selectable
25uA Quiescent Current with VBIAS Connected to
an auxiliary power supply higher than 6V
1.2V ±1% Feedback Reference Voltage
4ms Internal Soft-start Time
Fixed Switching Frequency at 300KHz
COT Control Mode with Integrated Loop
Compensation
Precision Enable Threshold for Programmable
Input Voltage Under-Voltage Lock Out Protection
(UVLO) Threshold and Hysteresis
Cycle-by-Cycle Current Limiting
Over-Voltage Protection
Over-Temperature Protection
Available in an ESOP-8 Package
APPLICATIONS
GPS Tracker
E-bike, Scooter
Moto Drives, Drones
48V Industry Power Bus System
DESCRIPTION
The SCT2A27 is an asynchronous buck converter with
wide input voltage ranging from 5.5V to 100V which
accommodates a variety of step-down applications,
making it ideal for automotive, industry, and lighting
applications. The SCT2A27 integrates an 500mΩ high-
side MOSFET and has 4A peak output current limit to
support high peak current application in GPS tracker
with 4G Module. The SCT2A27 also integrate a 200mA
LDO which can provide 5V or 3.3V power rail for the
system.
The SCT2A27, adopting the constant-on time (COT)
mode control with integrated loop compensation
greatly simplifies the converter off-chip configuration.
The SCT2A27 features Pulse Frequency Modulation
(PFM) mode at light load with low quiescent current
design, which enables the converter to achieve the
high-power efficiency during light-load or no-load
conditions.
The SCT2A27 offers cycle-by-cycle current limit,
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
FB
EN _BUCK
VIN
BST
EN_LDO
LDO
VBIAS
SW
SCT2A27
V
IN
=5.5~100V
V
OUT
Efficiency, Vout=12V
0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency(%)
Iout(A)
24VIN 12VOUT
36VIN 12VOUT
48VIN 12VOUT
60VIN 12VOUT
72VIN 12VOUT
SCT2A27
2 For more information www.silicontent.com © 2021 Silicon Content Technology Co., Ltd. All Rights Reserved
Product Folder Links: SCT2A27
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Revision 1.0: Production
Revision 1.1: Update table 1 and add optional capacitor for EN_LDO pin on page 8
DEVICE ORDER INFORMATION
PACKAGE MARKING
PACKAGE DISCRIPTION
2A27
8-Lead Plastic ESOP
1）For Tape & Reel, Add Suffix R (e.g. SCT2A27STER).
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperature unless otherwise noted
(1)
PIN CONFIGURATION
DESCRIPTION
MIN
MAX
UNIT
EN_LDO
LDO
1
2
3
4 5
6
7
8
FB
EN
VIN
BST
VBIAS
SW
GND
9
Figure 1. 8-Lead Plastic E-SOP
VIN
-0.3
110
V
BST
-0.3
116
V
SW
-1
110
V
BST-SW
-0.3
6
V
VBIAS
-0.3
33
V
EN, FB, LDO , EN_LDO
-0.3
6
V
Operating junction temperature T
J
(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
FB
1
Inverting input of the comparator. 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 1.2V typical.
EN
2
Enable pin to the regulator with internal pull-up current source. Pull below 1.23V to
disable the converter. Floating to enable the converter.
VIN
3
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.
BST
4
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.
SW
5
Regulator switching output. Connect SW to an external power inductor
VBIAS
6
Connect VBIAS to VOUT, achieve low power application
LDO
7
Output of LDO, at least a 1uF ceramic cap is connected