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Seiko Instruments Electronic Components Datasheet

S-8321 Datasheet

SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR

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S-8321 pdf
Rev.2.0
SMALL PACKAGE PFM CONTROL
STEP-UP SWITCHING REGULATOR
S-8321/8322 Series
The S-8321/8322 Series is a CMOS PFM-control step-up switching
regulator which mainly consists of a reference voltage source, an
oscillation circuit, a power MOS FET, and a comparator. The new
method PFM control circuit automatically switches the duty ratio
according to load, offering products of low ripple over a wide range, high
efficiency, high output current. A step-up switching regulator is
constructed by externally connecting only a coil, a capacitor and a diode
to the S-8321/8322 Series. This feature, along with its small package
and low current consumption, makes the S-8321/8322 Series ideal for
the power supply of portable equipment. A built-in protection circuit
prevents damage to the IC by turning off the MOS FET when the
voltage at CONT pin exceeds the limit during ON of the built-in MOS
FET. For applications requiring a high output current, products used
with an external transistor are also available in S-8322 Series.
n Features
Low voltage operation: 0.9 V min. (IOUT = 1 mA)
Low input current:
During operation: 6.8 µA (VOUT = 3 V, no load, typ.)
During shutdown: 0.5 µA (max.)
Duty ratio: auto-switching PFM control circuit type
External parts: coil, diode, and capacitor only
Output voltage: accuracy of ±2.4%
Shutdown function
External transistor type is available (S-8322 Series)
A Series : SOT-23-5 package
B Series : SOT-23-3 package
n Block Diagram
n 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
(1) S-8321 Series
CONT
Protection
circuit
PFM control
circuit
VOUT
VREF
+
-
(2) S-8322 Series
EXT
VOUT
VREF
PFM control
circuit
+
-
(ON / OFF)
VSS
Figure 1
(ON / OFF)
VSS
Seiko Instruments Inc.
1


Seiko Instruments Electronic Components Datasheet

S-8321 Datasheet

SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR

No Preview Available !

S-8321 pdf
SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR
S-8321/8322 Series
n Selection Guide
1. Name of the Product
S-832 X X X MP - XXX - T2
Tape Specification
Product name (abbreviation)
Output voltage (symbol)
Series name
A : SOT-23-5 / auto-switching type
B : SOT-23-3 / auto-switching type
Power MOS FET 1 : Built in
2 : Connected externally
2. List of the Product
Products
Output voltage (V)
S-8321A Series
S-8322A Series
S-8321B Series
S-8322B Series
2.2
S-8321AOMP-DNO-T2



2.5
S-8321AJMP-DNJ-T2 S-8322AJMP-DOJ-T2 S-8321BJMP-DTJ-T2

2.7
S-8321ALMP-DNL-T2

S-8321BLMP-DTL-T2

3.0 S-8321AIMP-DNI-T2 S-8322AIMP-DOI-T2 S-8321BIMP-DTI-T2 S-8322BIMP-DUI-T2
3.3
S-8321AGMP-DNG-T2 S-8322AGMP-DOG-T2 S-8321BGMP-DTG-T2

3.5
S-8321AFMP-DNF-T2 S-8322AFMP-DOF-T2


5.0 S-8321AAMP-DNA-T2 S-8322AAMP-DOA-T2 S-8321BAMP-DTA-T2 S-8322BAMP-DUA-T2
5.5
S-8321AMMP-DNM-T2



Consult our sales person for products with an output voltage other than specified above.
n Pin Assignment
(1) SOT - 23 - 5
Top view
54
12 3
1 ON / OFF
2 VOUT
3 NC
4 VSS
5 CONT / EXT
(2) SOT - 23 - 3
Top view
2
1x
1 VSS
2 VOUT
3 CONT / EXT
Pin name
Functions
Shutdown pin
ON / OFF “H”: normal operation (stepping up
operation)
“L”: stop stepping up (circuit stop)
VOUT Output voltage pin and IC power supply
VSS GND
CONT External inductor connection Note 1
EXT External transistor connection Note 2
Note 1: S-8321 Series : Open drain output
Note 2: S-8322 Series: CMOS output
Figure 2
n Absolute Maximum Ratings
Parameter
VOUT pin voltage
ON/OFF pin voltage
CONT pin voltage
CONT pin current
EXT pin voltage
EXT pin current
Power dissipation
Operating temperature
Storage temperature
Symbol
VOUT
ON/OFF
VCONT
ICONT
VEXT
IEXT
PD
TOPR
TSTG
( Unless otherwise specified: Ta=25°C )
Ratings
Unit
11 V
Vss-0.3 to 11
11
V
V
300 mA
Vss-0.3 to VOUT+0.3
V
±50
150
-40 to +85
-40 to +125
mA
mW
°C
°C
2 Seiko Instruments Inc.


Part Number S-8321
Description SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR
Maker Seiko
Total Page 28 Pages
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