ACE752D

120KHz 3.5A Buck DC-DC Converter

VER 1.1

4

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Input Voltage Range

10

40

V

Feedback Reference Voltage

0.815

0.835

0.855

V

Feedback Current

-0.1

μA

Quiescent Current (Switch Off)

0.75

1

μA

Current Sense Offset Voltage

70

75

80

mA

Switching Frequency

96

120

144

KHz

NMOS Switch On Resistance

0.15

10

Ω

NMOS Switch Leakage Current

104

μA

NMOS Current Limit

3

3.5

A

UVLO Input Rising Voltage

8

9

V

UVLO o Voltage Hysteresis

2

V

Thermal Shutdown Temperature

150

°C

Thermal Shutdown Hysteresis

20

°C

SoftStart Time

16

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.