SOT-89 Step-Up PFM Switcher with Auto-Load Sense
Absolute Maximum Ratings (TA = 25°C)
Parameter
VOUT Input Voltage
Symbol
VOUT
Ratings
Units
V
12
Voltage on pin LX
VLX
12
V
Current on pin LX
ILX
VEXT
IEXT
VCE
400
mA
V
mA
V
Voltage on pin EXT
Current on pin EXT
CE Input Voltage
VSS-0.3~VOUT+0.3
±50
12
VDD Input Voltage
VDD
12
V
Continuous Total Power Dissipation
PD (SOT-25)
PD (SOT-89)
Topr
150
500
-30~+80
-40~+125
mW
Operating Ambient Temperature
Storage Temperature
°C
°C
Tstg
Electrical Characteristics ILC6390
VOUT = 5.0V TA = 25°C. Unless otherwise specified, VIN = VOUT x 0.6, IOUT = 50mA. See schematic, fig. 3.
Parameter
Output Voltage
Input Voltage
Symbol
VOUT
VIN
Conditions
Test Circuit of Figure 1
Min
4.875
Typ
5.000
Max
5.125
10
Units
V
V
Oscillation Startup Voltage
Oscillation Hold Voltage
NO-Load Input Current
Supply Current 1 (See Note 2)
Supply Current 2
LX Switch-On Resistance
LX Leakage Current
VST
VHLD
IIN
IOUT = 1mA
IOUT = 1mA
IOUT = 0mA (See Note 1)
VOUT = 4.75V
VOUT = 5.5V
VOUT = 4.75V, VLX = 0.4
No external components, VOUT
VLX = 10V
0.80
0.9
V
V
µA
µA
µA
Ω
0.70
5.3
31.7
2.4
10.6
63.4
4.8
4.3
1.0
IDD
IDD
1
2
RSWON
ILXL
2.8
=
µA
Duty Ratio 1
Duty Ratio 2
DUTY 1 VOUT = 4.75V, Measuring of LX
70
50
75
55
80
60
%
%
waveform
DUTY 2 VOUT = 4.75V, Measuring of LX
on-time
Maximum Oscillation Freq. 1
Maximum Oscillation Freq. 2
Stand = by Current
MFO 1
MFO 2
ISTB
VOUT = 4.75V, 75% duty
VOUT = 4.75V, 55% duty
VOUT = 4.75V
VOUT = 4.75V, Existance of LX
Oscillation
85
153
100
180
115
207
0.5
kHz
kHz
µA
V
CE “High” Voltage
VCEH
0.75
CE “Low” Voltage
VCEL
VOUT = 4.75V, Disappearance of
LX Oscillation
0.20
V
CE “High” Current
CE “Low” Current
LX Limit Voltage
ICEH
ICEL
VLXLMT
VCE = VOUT x 0.95
VOUT = 4.75V, VCE = 0V
VOUT = 4.75V, fosc > MFO x 2
(See Note 3)
0.25
-0.25
1.1
µA
µA
V
0.7
Note:
1. The Schottky diode (S.D.), in figure 3 must be type MA735, with Reverse current (IR) < 1.0µA at reverse voltage (VR)=10.0V
2. “Supply Current 1” is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically operates which
results in less average power consumption.
The current that is actually provided by external VIN source is represented by “No-Load Input Current”
3. The switching frequency is determined by the delay time of the internal comparator and MFO1, which sets the min. on-time
Impala Linear Corporation
ILC6390 1.1
www.impalalinear.com
(408) 574-3939
Feb 2001
2
IMPALA [ Impala Linear Corporation ]
