SOT-89 Step-up Dual-Mode Switcher with Shutdown
Absolute Maximum Ratings (TA = 25°C)
Parameter
Symbol
VOUT
VLX
Ratings
Units
V
V
mA
V
mA
V
mW
°C
°C
VOUT Input Voltage
Voltage on pin LX
Current on pin LX
Voltage on pin EXT
Current on pin EXT
12
12
400
ILX
VEXT
IEXT
VCE
PD
TOPR
TSTG
VSS-0.3~VOUT+0.3
±50
CE Input Voltage
12
500
-30~+80
-40~+125
Continuous Total Power Dissipation
Operating Ambient Temperature
Storage Temperature
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
VOUT = 5.0V, FOSC = 100kHz TA - 25°C. Unless otherwise specified, VIN = VOUT x 0.6, IOUT = 50mA. See schematic, figure 3
Parameter
Output Voltage
Input Voltage
Oscillation Startup
Voltage
Symbol
VOUT
VIN
Conditions
Min
Typ
Max
Units
4.875 5.000 5.125
V
V
V
10
0.8
VST
LX = 10kΩ pull-up to 5V, VOUT = VST
Operation Startup
Voltage
VST1
IOUT = 1mA
0.9
V
No-Load Input Current
Supply Current 1
(See Note 2)
IIN
IDD
IOUT = 0mA (See Note 1)
LX = 10kΩ pull-up to 5V, VOUT = 4.5V
23.0
78.6 131.1
46.0
µA
µA
1
2
Supply Current 2
LX Switch-On
Resistance
IDD
RSWON
6.9
1.3
13.8
2.3
µA
LX = 10kΩ pull-up to 5V, VOUT = 5.5V
LX = 10kΩ pull-up to 5V, VOUT = 4.5V
Ω
LX Leakage Current
Oscillator Freq.
ILXL
FOSC
No external components, VOUT = VLX = 10V
LX = 10kΩ pull-up to 5V, VOUT = 4.5V,
Measuring of LX waveform
LX = 10kΩ pull-up to 5V, VOUT = 4.5V,
Measuring of LX on-time
1.0
115
µA
kHz
85
80
100
87
Maximum Duty Ration MAXDTY
92
%
PFM Duty Ration
Stand-by Current
CE “High” Voltage
PFMDTY VIN = 4.75V, Measuring of LX on-time
5
10
20
0.5
%
µA
V
ISTB
LX = 10kΩ pull-up to 5V, VOUT =4.5V
LX = 10kΩ pull-up to 5V, VOUT = 4.5V,
Existence of LX Oscillation
VCEH
0.75
CE “Low” Voltage
VCEL
0.20
V
LX = 10kΩ pull-up to 5V, VOUT = 4.5V,
Stopped LX Oscillation
CE “High” Current
CE “Low” Current
ICEH
ICEL
0.25
-0.25
µA
µA
LX = 10kΩ pull-up to 5V, VOUT = VCE = 4.5V
LX = 10kΩ pull-up to 5V, VOUT = 4.5V,
VCE = 0V
LX Limit Voltage
VLXLMT
0.7
1.1
V
LX = 10kΩ pull-up to 5V, VOUT = 4.5V,
FOSC > FOSC x 2 (See Note 2)
Efficiency
Slow Start Time
EFFI
TSS
85
10
%
msec
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
www.impalalinear.com
(408) 574-3939
Sept 1999
2
IMPALA [ Impala Linear Corporation ]
