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Seiko Instruments Electronic Components Datasheet

S-8327 Datasheet

(S-8323 / S-8327) SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR

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Contents
Features .............................................................. 1
Applications ......................................................... 1
Block Diagram ..................................................... 1
Selection Guide ................................................... 2
Pin Assignment ................................................... 3
Absolute Maximum Ratings ................................. 3
Electrical Characteristics ..................................... 4
Test Circuits ........................................................ 9
Operation............................................................. 10
External parts selection for DC-DC converter ...... 13
Standard Circuits ................................................. 17
Precautions ......................................................... 19
Application Circuits .............................................. 20
Dimensions.......................................................... 25
Markings.............................................................. 25
Taping ................................................................ 26
Temperature Characteristics .............................. 29
Voltage Characteristics ....................................... 31
Ripple Characteristics ......................................... 32
Transient Responses .......................................... 33
Operation Start Voltage and Operation Holding
Voltage Characteristics for Output Current ......... 35
Input Voltage Characteristics for Input Current ... 35
Reference Data .................................................. 36
Frequently Asked Questions .............................. 45


Seiko Instruments Electronic Components Datasheet

S-8327 Datasheet

(S-8323 / S-8327) SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR

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www.DataSheet4U.net
SMALL PACKAGE PWM CONTROL
STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
The S-8323/8327 Series is a CMOS PWM-control step-up switching
regulator which mainly consists of a reference voltage source, an
oscillation circuit, a power MOS FET (for S-8323 Series) , and an error
amplifier. The new PWM control circuit automatically changes the duty
ratio from 0% to 83% 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-8323 Series. This feature, along with its small package and low
current consumption, makes the S-8323 Series ideal for the power
supply of portable equipment. For applications requiring a high output
current, products used with an external transistor (S-8327 Series) are
also available.
 Features
 Applications

Low voltage operation: 0.9 V (I = 1mA)
OUT
 Low current consumption :
During operation: 17.2µA (typ.)
(V = 3 V, 50 kHz)
OUT
During shutdown : 0.5µA (max.)
 Duty ratio:
Built-in PWM control circuit
 External parts: coil, diode, and capacitor only
(a transistor is needed for the S-8327 Series.)
 Output voltage: accuracy of ±2.4%
 Soft start function: 6 msec (typ.)
 Shutdown function
 External transistor type is available (S-8327 Series)
 SOT-23-5 small plastic package
 SOT-23-3 small plastic package
 SOT-89-3 miniature power molded plastic package
 Step-down and voltage-inverting type are available.
 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
(1) S-8323 Series
CONT
VOUT
(2) S-8327 Series
VOUT
VREF
VREF
PWM
control
circuit
+
-
EXT
PWM
control
+
circuit
-
Soft start circuit
VSS
Soft start circuit
VSS
(ON / OFF)
(ON / OFF)
Figure 1 Block Diagram
Seiko Instruments Inc.
1


Part Number S-8327
Description (S-8323 / S-8327) SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
Maker Seiko
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S-8327 Datasheet PDF





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