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ST777 Datasheet(Fiches technique) 3 Page - STMicroelectronics

Numéro de pièce ST777
Description  LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
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ST777/778/779
3/11
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)
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.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VSTART
Start up Voltage
ILOAD < 10mA, TA = 25°C (Note 1)
1
V
VIN(MAX)
Maximum Input Voltage
(Note 1,2)
6
V
VO
Output Voltage ST777 779
(set to 5V), (Note 3)
ILOAD≤ 30mA, VIN = 1.1V to 5V or
ILOAD≤ 80mA, VIN = 1.8V to 5V or
ILOAD≤ 130mA, VIN = 2.4V to 5V
4.8
5.0
5.2
V
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
3.17
3.30
3.43
V
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
2.88
3.00
3.12
V
Output Voltage Range
ST779
(Note 4)
2.7
6.5
V
IIN
No Load Supply Current
ILOAD = 0 mA, (Switch ON) (Note 5)
270
µA
ISHDN
Shutdown Supply Current
SHDN=0V, (Switch OFF)
20
35
µA
IIN SHDN
Shutdown Input Current
SHDN = 0 to VIN
15
100
nA
SHDN =VIN to 5V
12
40
µA
υ
Efficiency
ILOAD=100mA
82
%
VIH
Shutdown Input Threshold
VIN=1V to 6V
VIN/2 + 0.25
V
ILIM
Current Limit
1.0
A
ILIM TEMPCO Current Limit Temperature
Coefficient
-0.3
%/°C
tOFFMIN
Minimum Switch Off Time
1.2
µs
tONMAX
Maximum Switch ON Time
VIN=2.5V
4.5
VIN=1.8V
6.5
VIN=1V
15
VCESAT NPN Switch saturation Voltage
ISW=400mA
0.25
V
ISW=600mA
0.33
ISW=1000mA
0.5
VCESAT NPN Rectifier Forward Drop
ISW=400mA
0.18
V
ISW=600mA
0.22
ISW=1000mA
0.4
VFB
Error Comparator Trip Point ST779, over operating input
voltage (Note 6)
1.23
±2%
V
IFB
FB Pin Bias Current
ST779, VFB=1.3V
50
nA
ILX
Switch Off Leakage Current
0.1
µA
Rectifier Off Leakage
Current
0.1
µA




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