SOT-89 Step-up Dual-Mode Switcher with Shutdown
Absolute Maximum Ratings (T
A
= 25°C)
Parameter
V
OUT
Input Voltage
Voltage on pin L
X
Current on pin L
X
Voltage on pin EXT
Current on pin EXT
CE Input Voltage
Continuous Total Power Dissipation
Operating Ambient Temperature
Storage Temperature
Symbol
V
OUT
V
LX
I
LX
V
EXT
I
EXT
V
CE
P
D
T
OPR
T
STG
Ratings
12
12
400
V
SS
-0.3~V
OUT
+0.3
±50
12
500
-30~+80
-40~+125
Units
V
V
mA
V
mA
V
mW
°C
°C
Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at
or above these limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliabil-
ity. Operating ranges define those limits between which the functionality of the device is guaranteed.
Electrical Characteristics
V
OUT
= 5.0V, F
OSC
= 100kHz T
A
- 25°C. Unless otherwise specified, V
IN
= V
OUT
x 0.6, I
OUT
= 50mA. See schematic, figure 3
Parameter
Output Voltage
Input Voltage
Oscillation Startup
Voltage
Operation Startup
Voltage
No-Load Input Current
Supply Current 1
(See Note 2)
Symbol
V
OUT
V
IN
V
ST
V
ST1
I
IN
I
DD
1
I
DD
2
R
SWON
I
LXL
F
OSC
MAXDTY
PFMDTY
I
STB
V
CEH
V
CEL
I
CEH
I
CEL
V
LXLMT
EFFI
T
SS
Conditions
Min
4.875
Typ
5.000
L
X
= 10kΩ pull-up to 5V, V
OUT
= V
ST
I
OUT
= 1mA
I
OUT
= 0mA
(See Note 1)
L
X
= 10kΩ pull-up to 5V, V
OUT
= 4.5V
L
X
= 10kΩ pull-up to 5V, V
OUT
= 5.5V
L
X
= 10kΩ pull-up to 5V, V
OUT
= 4.5V
No external components, V
OUT
= VL
X
= 10V
L
X
= 10kΩ pull-up to 5V, V
OUT
= 4.5V,
Measuring of L
X
waveform
L
X
= 10kΩ pull-up to 5V, V
OUT
= 4.5V,
Measuring of L
X
on-time
V
IN
= 4.75V, Measuring of L
X
on-time
L
X
= 10kΩ pull-up to 5V, V
OUT
=4.5V
L
X
= 10kΩ pull-up to 5V, V
OUT
= 4.5V,
Existence of L
X
Oscillation
L
X
= 10kΩ pull-up to 5V, V
OUT
= 4.5V,
Stopped L
X
Oscillation
L
X
= 10kΩ pull-up to 5V, V
OUT
= V
CE
= 4.5V
L
X
= 10kΩ pull-up to 5V, V
OUT
= 4.5V,
V
CE
= 0V
L
X
= 10kΩ pull-up to 5V, V
OUT
= 4.5V,
F
OSC
> F
OSC
x 2
(See Note 2)
85
80
5
0.75
23.0
78.6
6.9
1.3
Max
5.125
10
0.8
0.9
46.0
131.1
13.8
2.3
1.0
115
92
20
0.5
Units
V
V
V
V
µA
µA
µA
Ω
µA
kHz
%
%
µA
V
V
µA
µA
V
%
msec
Supply Current 2
L
X
Switch-On
Resistance
L
X
Leakage Current
Oscillator Freq.
Maximum Duty Ration
PFM Duty Ration
Stand-by Current
CE “High” Voltage
CE “Low” Voltage
CE “High” Current
CE “Low” Current
L
X
Limit Voltage
Efficiency
Slow Start Time
100
87
10
0.20
0.25
-0.25
0.7
85
10
1.1
Notes:
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(IIN)”
3. Switching frequency is determined by delay time of internal comparator to turn Lx “off”, and minimum “on” time as determined
by MAXDTY spec.
Impala Linear Corporation
ILC6380/1 1.4
(408) 574-3939
www.impalalinear.com
Sept 1999
2
IMPALA [ Impala Linear Corporation ]
