ST777ACD 데이터 시트보기 (PDF) - STMicroelectronics
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ST777ACD
STMicroelectronics
ST777ACD Datasheet PDF : 11 Pages
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ST777/778/779
ELECTRICAL CHARACTERISTICS (VIN=2.5V, CI = 22µF, CO=100µF, SHDN and ILIM connected to IN,
AGND connected to PGND, TA=0 to 85°C, unless otherwise specified. Typical values are referred at
TA=25°C)
Symbol Parameter
Test Conditions
Min.
Typ.
Max. Unit
VSTART Start up Voltage
ILOAD < 10mA, TA = 25°C (Note 1)
VIN(MAX) Maximum Input Voltage
(Note 1,2)
VO
Output Voltage ST777 779 ILOAD≤ 30mA, VIN = 1.1V to 5V or
(set to 5V), (Note 3)
ILOAD≤ 80mA, VIN = 1.8V to 5V or
ILOAD≤ 130mA, VIN = 2.4V to 5V
Output Voltage ST778
(Note 3)
SEL=0V
ILOAD≤ 50mA,VIN =1.1V to 3.3V or
ILOAD≤ 210mA,VIN =1.8V to 3.3V or
ILOAD≤ 300mA,VIN =2.4V to 3.3V
SEL=OPEN
ILOAD≤ 30mA, VIN =1.1V to 3V or
ILOAD≤ 210mA, VIN =1.8V to 3V or
ILOAD≤ 300mA, VIN =2.4V to 3V
Output Voltage Range
ST779
(Note 4)
IIN
No Load Supply Current ILOAD = 0 mA, (Switch ON) (Note 5)
ISHDN Shutdown Supply Current SHDN=0V, (Switch OFF)
IIN SHDN Shutdown Input Current
SHDN = 0 to VIN
SHDN = VIN to 5V
υ
Efficiency
ILOAD=100mA
VIH
Shutdown Input Threshold VIN=1V to 6V
ILIM
Current Limit
ILIM TEMPCO Current Limit Temperature
Coefficient
tOFFMIN Minimum Switch Off Time
tONMAX Maximum Switch ON Time VIN=2.5V
VIN=1.8V
VIN=1V
VCESAT NPN Switch saturation Voltage ISW=400mA
ISW=600mA
ISW=1000mA
VCESAT NPN Rectifier Forward Drop
ISW=400mA
ISW=600mA
ISW=1000mA
VFB
Error Comparator Trip Point ST779, over operating input
voltage (Note 6)
IFB
FB Pin Bias Current
ST779, VFB=1.3V
Switch Off Leakage Current
ILX
Rectifier Off Leakage
Current
1
6
4.8
5.0
5.2
3.17
3.30
3.43
2.88
3.00
3.12
2.7
6.5
270
20
35
15
100
12
40
82
VIN/2 + 0.25
1.0
-0.3
1.2
4.5
6.5
15
0.25
0.33
0.5
0.18
0.22
0.4
1.23±2%
50
0.1
0.1
V
V
V
V
V
V
µA
µA
nA
µA
%
V
A
%/°C
µs
V
V
V
nA
µA
µA
Note 1: Output in regulation, VOUT = VOUT (nominal) ± 4%.
Note 2: At hight VIN to VOUT differentials, the maximum load current is limited by the maximum allowable power dissipation in the package.
Note 3: Start-up guaranteed under these load conditions.
Note 4: Minimum value is production tested. Maximum value is guaranteed by design and is not production tested.
Note 5: In the ST779 supply current depends on the resistor divider used to set the output voltage.
Note 6: VOUT is set to a target value of +5V by 0.1% external feedback resistors. VOUT is measured to be 5V±2.5% to guarantee the error
comparator trip point.
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