ACE752D Datasheet, PDF (4/9 Pages) ACE Technology Co., LTD. – 120KHz 3.5A Buck DC-DC Converter

ACE752D
120KHz 3.5A Buck DC-DC Converter
Electrical Characteristics (Tamb=25°C, VIN=12V, VOUT=5V, Load Current=0, unless otherwise specified)
Parameter
Input Voltage Range
Feedback Reference Voltage
Feedback Current
Quiescent Current (Switch Off)
Current Sense Offset Voltage
Switching Frequency
NMOS Switch On Resistance
NMOS Switch Leakage Current
NMOS Current Limit
UVLO Input Rising Voltage
UVLO o Voltage Hysteresis
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
SoftStart Time
Symbol
V_IN
V_FB
I_FB
I_{switch off}
V_CS
F_S
R_ON
I_Ieak
I_LMIT
V_IN(rising)
V_IN(hyst)
T_j(sd)
T_hyst
T_SS
Conditions
V_IN pin voltage
V_FB=0.81V
V_FB=1V
V_FB=0.6V
V_SW=0V
Min
10
0.815
Typ
0.835
-0.1
Max
40
0.855
0.75 1
70 75 80
96 120 144
0.15 10
104
3 3.5
8
9
2
150
20
16
Unit
V
V
μA
μA
mA
KHz
Ω
μA
A
V
V
°C
°C
mS
FUNCTION DESCRIPTION
The ACE752D is a complete and simple step down DC-DC converter with adjustable current Limit. By
means of an on board current sense resistor and the availability of the current sense pins, a current limit
programming is very simple and accurate.
Moreover, constant current control can be used to charge batteries. The device can be used as a
standard DC-DC converter with adjustable current limit (set by using the external sense resistor).
The internal robust N-channel MOS transistor with a typical value of 150 mΩ assures high efficiency
and a minimum dropout even at high output current level. The internal limiting current of typical value of
3.5 A protects the device from accidental overload avoiding dangerous loads damage.
When overload or output short, the main switch is turned on and off periodically to limit the current
delivered to the load, protect the load and the device itself. When output short is removed or the load
decrease to normal, the output voltage recovers.
If the temperature of the chip goes higher than a fixed internal threshold (150 °C with 20°C hysteresis),
the device is turned off.
The internal fixed switching frequency of 120 kHz, and the small SOP-8/ESOP-8 packages allow
building an ultra compact DC-DC converter with a minimum board space.
VER 1.1 4