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PDF S-8821 Data sheet ( Hoja de datos )
| Número de pieza | S-8821 | |
| Descripción | VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER | |
| Fabricantes | Seiko Instruments | |
| Logotipo |  |
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Rev.3.1_00
VOLTAGE REGULATION
STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
The S-8821 series is a CMOS step-up charge pump
DC-DC converter with a voltage regulation function.
The S-8821 series consists of an oscillation circuit, a
controller, a reference voltage circuit, an error
amplifier circuit, and an output switching transistor,
and can regulate the output voltage by PFM control.
Since small ceramic capacitors can be used for the
pump capacitor, input capacitor, and output
capacitor, the mounting area can be minimized.
Features
• Step-up PFM control CMOS charge pump
• Power supply voltage:
• Output voltage:
• Output voltage accuracy:
• Built-in soft start circuit:
• Output current
• Oscillation frequency:
• ON/OFF function:
• Ultra-small package:
• Lead-free products
1.6 to 5.0 V
2.5 to 5.5 V, selectable in 0.1 V steps.
±2 % max.
1.0 ms typ.
25 mA (VIN=(VOUT(S) × 0.80) V)
1.0 MHz typ.
During standby: 1 μA max.
SOT-23-6W
Applications
• Lithium ion battery driven applications
• Local power supply
• Power supply for white LED display backlights
Packages
Package Name
SOT-23-6W
Package
MP006-B
Drawing Code
Tape
MP006-B
Reel
MP006-B
Seiko Instruments Inc.
1
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Rev.3.1_00
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Absolute Maximum Ratings
Table 3
(Ta=25°C unless otherwise specified)
Items
Symbols
Absolute Maximum Ratings
Units
C+ pin voltage
C− pin voltage
VIN pin voltage
VOUT pin voltage
ON/OFF pin voltage
Power dissipation
VC+
VC−
VIN
VOUT
VON/OFF
PD
VGND−0.3 to VGND+7.5
VGND−0.3 to VGND+7
VGND−0.3 to VGND+5.5
VGND−0.3 to VGND+7
VGND−0.3 to VIN+0.3
300 (When not mounted on board)
650*1
V
V
V
V
V
mW
mW
Operating ambient temperature Topr
−40 to +85
°C
Storage temperature
Tstg
−40 to +125
°C
*1. When mounted on board
[Mounted board]
(1) Board size: 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name: JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product could suffer
physical damage. These values must therefore not be exceeded under any conditions.
(1) When mounted on board
800
(2) When not mounted on board
400
700 350
600 300
500 250
400 200
300 150
200
100
0
0
50 100 150
100
50
0
0
50 100 150
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Figure 3 Power Dissipation of Package
Seiko Instruments Inc.
5
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Rev.3.1_00
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
External Capacitor Selection
1. Input and Output Capacitors (CIN, COUT)
The input capacitor (CIN) lowers the power supply impedance and averages the input current.
The CIN value is selected according to the impedance of the power supply that is used. Select a ceramic
capacitor with a small equivalent series resistance (ESR). Although this figure varies according to the
impedance of the power supply that is used as well as the load current value, it is generally in the range
of 4.7 μF to 10 μF.
For the output capacitor (COUT), select a ceramic capacitor with a small ESR for smoothing the ripple
voltage. A value of 10 μF is recommended for the capacitance value. Use of a capacitor with a
capacitance lower than 10 μF results in a larger ripple voltage. Conversely, use of a capacitor with a
capacitance greater than 10 μF results in the output voltage not being able to rise up to setting value
and the impossibility to obtain the desired output current.
2. Pump Capacitor (CPUMP)
The pump capacitor (CPUMP) is required for stepping up the voltage. Select a ceramic capacitor with a
small ESR. A capacitance value of 0.10 μF is recommended. Use of a capacitor with a capacitance
greater than 0.10 μF results in a larger ripple voltage. Conversely, use of a capacitor with a capacitance
lower than 0.10 μF results in the output voltage not being able to raise up to setting value and the
impossibility to obtain the desired output current.
Seiko Instruments Inc.
11
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11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet S-8821.PDF ] | |
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