ACE714B Datasheet, PDF (1/5 Pages) ACE Technology Co., LTD. – Step-up DC/DC Converter Backlight Driver

ACE714B
Step-up DC/DC Converter Backlight Driver
Description
The ACE714B is a fixed frequency, constant current step-up DC/DC converter ideal for driving LEDs
used in backlighting applications on cellular phones, PDAs and digital cameras etc. Output voltage of up
to 28V can be derived, and from a 2.5V input three white LED’s can be driven in series. Luminance of the
LED’s is controlled by changing the duty cycle of a PWM signal applied to the CE pin. In addition, an
internal MOSFET with an Rds-on of 0.3Ω is used. Allow profile and small board area solution can be
achieved using a chip coil and an ultra small ceramic output capacitor.
Features
 Input voltage range : 2.5V-5.5V
 Output voltage range : up to 28V
 Low 104mV feedback voltage
 Oscillation frequency : 1.2MHz
 Typical Efficiency : 88%.
 Control : PWM control.
 Stand-by Current : <1μA
 High Supply Capability: Deliver 10V 300mA from 3.5V supply
 Lx limit Current : 1.3A
Application
 For White LED Drivers
 Mobil phones, PHS, PDAs, Digital still cameras
Absolute Maximum Ratings
Parameter
Symbol
Value
Unit
Vin Voltage
V_IN
V_SS-0.3~V_SS+6
V
Output Voltage
V_OUT
V_SS-0.3~V_SS+30
V
LX Voltage
V_LX
V_SS-0.3~V_SS+30
V
FB Voltage
V_FB
V_SS-0.3~V_SS+6
V
CE Voltage
V_CE
V_SS-0.3~+6
V
OVP Voltage
V_OVP
V_SS-0.3~V_SS+30
V
Power Dissipation
P_D
600
mW
Operating Junction Temperature
T_OPR
-25 to +85
℃
Storage Temperature Range
T_STG
-40 to +125
℃
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These
values must therefore not be exceeded under any conditions.
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