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參數資料
| 型號： | S-8328J25MC-F2F-T2 |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.3 A SWITCHING CONTROLLER, 287.5 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | PLASTIC, SOT-23, 5 PIN |
| 文件頁數： | 1/65頁 |
| 文件大小： | 759K |
| 代理商： | S-8328J25MC-F2F-T2 |
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Seiko Instruments Inc.
1
S-8324/8328 Series
SMALL PACKAGE PWM/PFM CONTROL
STEP-UP SWITCHING REGULATOR
The S-8324/8328 is a series of CMOS PWM/PFM-control step-up
switching regulators which mainly consist of a reference voltage source,
an oscillation circuit, a power MOS FET (S-8324 Series) and an error
amplifier. The new method PWM/PFM control circuit automatically
switches the control method according to the current load, offering
products of a wide range, high efficiency. A step-up switching regulator is
constructed by externally connecting only a coil, a capacitor and a diode
to the S-8324 Series. This feature, along with its small package and low
current consumption, makes the S-8324 Series ideal for the power supply
of portable equipment. For applications requiring a high output current,
products used with an external transistor (S-8328 Series) are also
available.
Features
Low voltage operation:
0.9 V (IOUT=1 mA, 50 kHz and 100 kHz models)
Low current consumption:
During operation:
17.2
A (typ.)
(VOUT = 3 V, 50 kHz)
During shutdown: 0.5
A (max.)
Low Input current:
10.4
A ( typ.)
(VOUT = 3 V, 50 kHz, no load)
Duty ratio:
During PWM control: 15 to 83% typ.
(15 to 78% for 250kHz model)
During PFM control: 15 % typ.
External parts: coil, diode, and capacitor only
(a transistor is needed for the S-8328 Series.)
Output voltage: accuracy of
±2.4%
Oscillation frequency:
30 kHz, 50 kHz, 100 kHz, and 250 kHz
Software start function is built-in
Shutdown function
External transistor type is available (S-8328 Series)
SOT-23-5 small plastic package
SOT-23-3 small plastic package
SOT-89-3 miniature power molded plastic package
Step-down and invert type are also available.
Applications
Power supplies for portable equipment such as pagers, handy calculators, and remote controllers
Constant voltage power supplies for cameras, video equipment, and communications equipment
Power supply for microcomputers
Block Diagram
ON/ OFF
PWM
control
circuit
-
+
VOUT
CONT
VREF
Soft start circuit
VSS
-
+
VREF
VSS
VDD
VSS
VREF
-
+
VREF
EXT
ON/ OFF
(2) S-8328 Series (Types B, H)
(1) S-8324 Series (Types A, C, H)
PWM
control
circuit
Soft start circuit
(4) S-8328 Series (Types E, J)
(3) S-8324 Series (Types D, J)
PWM
control
circuit
Soft start circuit
PWM
control
circuit
Soft start circuit
Figure 1 Block Diagram
Rev. 7.2_10
DISCONTINUED
PRODUCT
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