
SOT-89 Step-up Dual-Mode Switcher with Shutdown
Impala Linear Corporation
3
(408) 574-3939
www.impalalinear.com
Sept 1999
ILC6380/1 1.4
V
OUT
= 5.0V, F
OSC
= 100kHz T
A
= 25°C. Unless otherwise specified, V
IN
= V
OUT
X0.6, I
OUT
= 50mA. See the schematic, figure 4.
Parameter
Symbol
Output Voltage
V
OUT
Test Circuit of Figure 2
Input Voltage
V
IN
Oscillation Startup Voltage
V
ST2
V
OUT
= V
ST2
Operation Startup Voltage
V
ST1
I
OUT
= 1mA
Supply Current 1
(See Note 2)
V
OUT
= 4.5V
Supply Current 2
I
DD
2
EXT = 10k
pull-up to 5V,
V
OUT
= 5.5V
EXT “High” On-Resistance
R
EXTH
EXT = 10k
pull-up to 5V,
V
OUT
= 4.5V, V
EXT
=
V
OUT
– 0.4V
EXT “Low” On-Resistance
R
EXTL
EXT = 10
pull-up to 5V,
V
OUT
= 4.5V, V
EXT
= V
OUT
- 0.4V
Oscillator Frequency
F
OSC
EXT = 10k
pull-up to 5V, V
OUT
=
4.5V, Measuring of EXT waveform
Maximum Duty Ratio
MAXDTY EXT = 10k
pull-up to 5V, V
OUT
=
4.5V, Measuring of EXT high state
CE “High” Voltage
V
CEH
EXT = 10k
pull-up to 5V, V
OUT
=
4.5V, Existence of Oscillation
CE “Low” Voltage
V
CEL
EXT = 10k
pull-up to 5V, V
OUT
=
4.5V, Stopped EXT Oscillation
CE “High” Current
I
CEH
EXT: 10k
pull-up to 5V,
V
OUT
= 4.5V, V
CE
= V
OUT
X 0.95V
CE “Low” Current
I
CEL
EXT = 10k
pull-up to 5V,
V
OUT
= 4.5V, V
CE
= 0V
Efficiency
EFFI
Slow Start Time
T
SS
Notes:
ILC6380
1
2
3
4
5
CE
V
OUT
C
L
+
GND
V
IN
L
SD
ILC6381
1
2
3
4
5
CE
V
OUT
C
L
+
L
SD
V
IN
C
B
R
B
Tr
L: 100μH ( SUMIDA, CD-54)
SD: Diode (Schottky diode; MATSUSHITA MA735)
CL: 16V 47μF (Tantalum Capacitor; NICHICON, F93)
L: 47μH ( SUMIDA, CD-54)
SD: Diode (Schottky diode; MATSUSHITA MA735)
CL: 16V 47μF (Tantalum Capacitor; NICHICON, F93)
RB: 1kW
CB: 3300pF
Tr: 2SC3279, 2SDI628G
Conditions
Min
4.875
Typ
5.000
78.6
Max
5.125
10
0.8
0.9
131.1
Units
V
V
V
V
μA
I
DD
1
EXT = 10k
pull-up to 5V,
6.9
13.8
μA
30
50
30
50
85
100
115
kHz
80
87
92
%
0.75
V
0.20
V
0.25
μA
-0.25
μA
85
10
%
msec
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 V
IN
source is represented by “No-Load Input Current (I
IN
)”
Electrical Characteristics ILC6380BP-50
Typical Applications
Figure 3
Figure 4