AOZ1284
Electrical Characteristics
TA = 25°C, VIN = 12V, VEN = 3V, VOUT = 3.3V, unless otherwise specified. Specifications in BOLD indicate a
temperature range of -40 °C to +85 °C.
Symbol
VIN
Parameter
Supply Voltage
Conditions
Min.
3
Typ.
Max
36
Units
V
VUVLO
Input Under-Voltage Lockout
Threshold
VIN rising
VIN falling
2.9
V
2.3
IIN
Supply Current (Quiescent)
IOUT = 0, VFB = 1V,
1
1.5
mA
VEN >1.2V
IOFF
Shutdown Supply Current
Feedback Voltage
VEN = 0V
10
µA
mV
%
VFB
TA=25oC
788
800
0.5
812
VFB_LOAD
VFB_LINE
IFB
Load Regulation
0.4A < Load < 3.6A
Io=2A
Line Regulation
0.03
0.5
%/V
µA
Feedback Voltage Input Current
VFB = 800mV
1
Enable
VEN_OFF
VEN_ON
EN Input Threshold
EN Input Hysteresis
Off threshold
On threshold
0.4
V
1.2
VEN_HYS
200
mV
Current Limit
1284
5
6
Peak Current Limit
A
1284-1
5.5
6.5
Soft Start (SS)
ISS
Soft Start Source Current
2
2.5
3
µA
Modulator
fO
Frequency
RF = 270kΩ
RF = 46.6kΩ
160
0.8
200
1
240
1.2
kHz
MHz
DMAX
TON_MIN
GVEA
GEA
Maximum Duty Cycle
fO = 1MHz
87
%
ns
Minimum On Time
150
500
170
4.5
Error Amplifier Voltage Gain
Error Amplifier Transconductance
V/V
µA/V
A/V
GCS
Current Sense Circuit
Transconductance,
Power Stage Output
ILEAKAGE NMOS Leakage
RDSON1 NMOS On- Resistance
Thermal Protection
VEN=0V, VLX=0V
10
70
µA
50
mΩ
TSD
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
145
45
°C
°C
TSD_HYS
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Page 4 of 14
Rev. 0.5 March 2012
AOS [ ALPHA & OMEGA SEMICONDUCTORS ]
