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| 型號： | S-8328B50MA-EXE-T2 |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.3 A SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO3 |
| 封裝： | PLASTIC, SOT-23, 3 PIN |
| 文件頁數(shù)： | 19/65頁 |
| 文件大?。?/td> | 759K |
| 代理商： | S-8328B50MA-EXE-T2 |
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SMALL PACKAGE PWM/PFM CONTROL STEP-UP SWITCHING REGULATOR
S-8324/8328 Series
Rev. 7.2_10
26
Seiko Instruments Inc.
Application Circuits
1. Backup Circuit
Reduces the backup battery voltage from 3 V to 1.5 V (from 2 cells to 1 cell).
2. 5V/Backup Change
The S-8324A/8328B is provided with a power OFF function, where VOUT becomes approx. VIN-0.6V. This characteriistic allows
the backup voltage of the microcomputer to be supplied with low current consumption.
3. Step-down DC/DC converter
The start circuit is not needed because the power supply is supplied from VDD to the IC.
The maximum input voltage for VDD is 9 V.
DO NOT mount RA and RB resistors when VCC is 2V for S-8324D20MC, 3V for S-8324D30MC, and 5V for S-8324D50MC.
The external resistor Rb must be 60
or more and RE must be 6k or less. A large value for RE raises efficiency due to the
reduction of reactive current for RE and Rb.
Too large value of RE lowers efficiency due to the large switching loss of the external transistor (Tr). Choose a suitable value of RE
under the operating conditions.
Figure 20
CONT
ON/OFF
S-8324A
VOUT
VSS
-
+
-
+
S-RAM
1.5V
Main Power
Figure 21
Figure 22
VDD
S-8324D
-
+
-
+
VOUT
VSS
COUT
RE
Rb
CONT
CIN
VIN
Tr
VCC
RA
RB
CC
CONT
ON/OFF
S-8324A
VOUT
VSS
-
+
-
+
Voltage
Detector
CE
CPU
VIN
DISCONTINUED
PRODUCT
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