Ace ACE725E Schematics
ACE725E
Parameter
Value
IN Voltage
–0.3V to 26V
SW ,EN Voltage
–0.3V to VIN+0.3
BST Voltage
–0.3V to SW+6V
FB Voltage
–0.3V to 6V
SW to ground current
Internally limited
Operating Temperature Range
–40°C to 85°C
Storage Temperature Range
.–55°C to 150°C
Thermal Resistance
SOT23-6
θ
JA
θJC
220 110 °C/W
24V , 1.2A High Efficiency Step-Down Converter
Description
The ACE725E is a wide input range, high-efficiency, high frequency DC-to-DC step-down switching
regulator, capable of delivering up to 1.2A of output current. With a fixed switching frequency of 1.4MHz,
this current mode PWM controlled converter allows the use of small external components, such as
ceramic input and output caps, as well as small inductors, while still providing low output ripples. Together
with the tiny package ACE725E is in, without external compensation components, it is an ideal solution for
system designer with stringent board space requirements. ACE725E also employs a proprietary control
scheme that switches the device into a power save mode during light load, thereby extending the range of
high efficiency operation.
ACE725E is available SOT23-6 Packages.
Features
Wide Input Operating Range from 4.5V to 24V
High Efficiency:Up to 94%
Capable of Delivering 1.2A
1.4MHz Switching frequency
No External Compensation Needed
Current Mode control
Logic Control Shutdown
Thermal shutdown and UVLO
Available in SOT23-6 Package
Application
Set top boxes
Security Surveillance systems
LED lighting
Absolute Maximum Rating
(Note: Exceeding t
hese limits may damage the device. Exposure to absolute maximum rating
conditions
for
long periods may affect
device reliab
ility.)
VER 1.1 1
24V , 1.2A High Efficiency Step-Down Converter
SOT-23-6
Description
Function
1
BST
Bootstrap pin. Connect a 10nF capacitor from this pin to SW.
2
GND
Ground
3
FB
Feedback Input. Connect an external resistor divider from the output to
FB and GND to set V
OUT
4
EN
Enable pin for the IC. Drive this pin high to enable the part, low to
disable.
5
IN
Supply Voltage. Bypass with a 10μF ceramic capacitor to GND.
6
SW
Inductor Connection. Connect an inductor Between SW and the
regulator output.
EN
GND
B230A
3 6 49.9K
6.3V
22μF
25V
10μF
SW
FB
16.2K
2
Typical Application
VIN 12V
5 1
IN BST 10nF
V
4
Packaging Type
SOT-23-6
3.3V/1.2A
OUT
ACE725E
VER 1.1 2
Halogen - free
GM : SOT-23-6
Pb - free
Ordering information
ACE725E XX + H
Block Diagram
ACE725E
24V , 1.2A High Efficiency Step-Down Converter
VER 1.1 3
24V , 1.2A High Efficiency Step-Down Converter
Parameter
Conditions
Min
Typ
Max
Unit
Input Voltage Range
4.2 24
V
Input UVLO
Rising, Hysteresis=140mV
3.55 V
Input OVP
Rising, Hysteresis=1.3V
26 V
Input Supply Current
VFB=0.9V
0.6 mA
Input Shutdown Current
6
uA
FB Feedback Voltage
0.79
0.81
0.83
V
FB Input Current
0.01
uA
Switching Frequency
1.0
1.4
1.8
MHz
Fold-Back Frequency
VFB=0V
100
KHz
High side Switch ON Resistance
ISW=200mA
250
500
mΩ
High side Switch Current Limit
V
IN
= 12V,
1.5 2
A
SW Leakage Current
VIN=12V, VSW=0, EN=GND
10
uA
EN Input Current
1
uA
EN Input Low Voltage
1
1.5 3 V
Thermal Shutdown
Hysteresis=40℃
150 °C
Electrical Characteristics
V
= 12V, unless otherwise specified. Typical values are at TA=25°C
IN
ACE725E
VER 1.1 4
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