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PDF S1F78B20 Data sheet ( Hoja de datos )
| Número de pieza | S1F78B20 | |
| Descripción | Power Supply IC | |
| Fabricantes | Epson | |
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Power Supply IC
S1F78B20
Technical Manual
www.DataSheet4U.com
SEIKO EPSON CORPORATION
Rev.1.1
1 page  
1. DESCRIPTION
1. DESCRIPTION
The S1F78B20 is a positive voltage CMOS regulator IC. This IC provides the low output noise, high-speed load
transient response, high-load stability, and high accuracy mechanisms, ensuring 50µA, which is lower than the
conventional consumption current.
The output voltage is fixed in the IC, and its allowable range is between 1.8 to 4.0V based on the laser trimming
technique.
This IC consists of the reference voltage supply, output voltage setting resistor, overcurrent protection circuit,
output voltage drop correction circuit, phase compensation circuit, chip enable circuit, pulse response circuit,
and other components.
It is ideal for the power supply of the high-frequency circuit, realizing low output noises with low operating
current.
2. FEATURES
• Low consumption current:
• Output noise voltage:
• Output voltage:
• Output current:
• Output voltage accuracy:
• Input-output potential difference:
• Ripple rejection:
• Overcurrent detection current:
• Short-circuit holding current:
• Range of capacitor:
At operating: [Typ.] 50µA (VOUT(S)=3.0V, at no-load),
In standby: [Max.] 0.1µA
30µVrms (VOUT(S) = 3.0V, Cout=1.0µF, 10 to 100kHz)
1.8 to 4.0V DC (Can be set in 0.1V steps.)
150mA (VDD=VOUT(S)+1.0V)
±2.0% (Iout=50mA)
[Typ.] 0.30V (VOUT(S) = 3.0V, IOUT=150 mA)
[Typ.] 80 dB (VOUT(S)=3.0V, VDD=VOUT(S)+1.0V, f=1kHz,
Vripple=0.2Vp-pAC)
[Typ.]350mA
[Typ.]30mA
Cin=1.0 to 10µF, Cout=1.0 to 10µF, ESR=1m to 6.8Ω
3. PACKAGE
VSON-6pin
SOT23-5pin
www.Da4taS.heetA4UP.coPmLICATION
• Mobile communication equipment (Mobile-phone, cordless phone, radio communication equipment)
• Camera, video equipment
• Mobile AV equipment
• Portable game device
• Home appliance
• Battery equipment
S1F78B20 Technical Manual (Rev.1.1)
EPSON
1
5 Page 
12. CHARACTERISTICS
6. Output Voltage Temperature Coefficient (Measuring circuit, Fig.1)
Rate in change of the output voltage that is caused when changing the ambient temperature while maintaining
the output current
Obtained from the following formula:
Output Voltage Temperature Coefficient[ppm/
=
∆VOUT [ppm/
∆Ta VOUT
]
=
∆VOUT
∆Ta
[mV/
]
*
1
VOUT(S)
[V]
*1000
<Conditions>
Rate in change of the output voltage that is caused when changing the ambient temperature in the rated range
from -40°C to +85°C while setting the input voltage to VOUT(S)+1.0[V].
7. Consumption Current (At Operation with No Load) (Measuring circuit, Fig.3.1)
CE pin = VDD (IC active state), operating current at a specific input voltage and load current
ISS1: No load, ISS2: IOUT=50[mA]
<Conditions>
Current value at CE=VDD and IOUT=0[mA]; the input voltage is set to VOUT(S)+1.0[V].
8. Consumption Current (Standby) (Measuring circuit, Fig.3.3)
Input current value that is obtained when changing the input voltage while setting CE pin = VSS and output
open (no connection) state.
<Conditions>
Current value at CE=VSS and IOUT=0[mA]; the input voltage is set to VOUT(S)+1.0[V].
9. Limited Current (Measuring circuit, Fig.1)
Output current value required to run the overcurrent protection circuit.
Max. current value when the output voltage drastically lowers by the overcurrent protection circuit that
prevents overcurrent. (Max. IC output current)
<Conditions>
Set the input voltage to VOUT(S)+1.0[V] and the CE pin voltage to VDD.
10. Short-Circuit Current (Measuring circuit, Fig.1)
Value of the current that is supplied to the output when the output pin is short-circuited with VSS. Output
current value required to run the short-circuit current protection circuit.
<Conditions>
Set the input voltage to VOUT(S)+1.0[V] and the CE pin voltage to VDD, then connect the output pin to VSS.
www.DataSheet4U.com
11. Ripple Rejection (Measuring circuit, Fig.4)
Indicates the ratio with which AC components included in the input voltage appear in the output voltage, by
[dB].
<Conditions>
Input voltage = CE pin voltage = VOUT(S)+1.0[V]
Output current IOUT = 50[mA]
Frequency obtained by superposing the sine wave of 0.2[Vp-pAC] with the input voltage: 10[Hz] to
100[kHz]
12. Input Transient Response (Measuring circuit, Fig.2)
Change of the output voltage that is caused when the input voltage is changed instantaneously.
<Conditions>
Change of the output voltage that is caused when the input voltage is changed from VOUT+1.0[V] to
VOUT+2.0[V] or from VOUT+2.0[V] to VOUT+1.0[V] at 5[µs]. Output current IOUT = 50[mA]
13. Load Transient Response (Measuring circuit, Fig.1)
Change of the output voltage that is caused when the output current is changed at 500[ns].
<Conditions>
1) Change of the output voltage that is caused when the output current is changed from 0.1[mA] to 50[mA]
or 50[mA] to 0.1[mA]. Input voltage = VOUT(S)+1.0[V], Cout=4.7[µF]
2) Change of the output voltage that is caused when the output current is changed from 0.1[mA] to
150[mA] or 150[mA] to 0.1[mA]. Input voltage = VOUT(S)+1.0[V], Cout=4.7[µF]
S1F78B20 Technical Manual (Rev.1.1)
EPSON
7
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet S1F78B20.PDF ] | |
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