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S-8352 Datasheet

(S-8351 / S-8352) SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR

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Rev.2.0_00
STEP-UP, SUPER-SMALL PACKAGE, PFM CONTROL
SWITCHING REGULATOR / SWITCHING REGULATOR
CONTROLLER
S-8351/8352 Series
The S-8351/8352 Series is a CMOS step-up switching regulator controller
which mainly consists of a reference voltage source, an oscillation circuit,
a comparator and PFM control circuit. The PFM control circuit allows the
duty ratio to be automatically switched according to the load (at light load :
50%, at high output current : 75%), enabling products with a low ripple
over a wide range, high efficiency, and high output current (A, B, and D
type). Products with a fixed duty ratio of 75% are also available (C type).
The S-8351 Series can configure a step-up switching regulator with an
external coil, capacitor, and diode. A protection circuit turns off the built-in
MOS FET when the voltage at the CONT pin exceeds the limit to prevent it
from being damaged. In addition to the above features, the small package
and low current consumption, makes the S-8351 Series ideal for
applications such as the power supply unit of portable equipment.
The S-8352 Series, which features an external transistor, is suitable for
applications requiring a high output current.
„ Features
• Low voltage operation : Startup at 0.9 V min. (IOUT = 1 mA) guaranteed
• Low current consumption : During operation 23.2 µA (VOUT = 3.3 V, typ.)
During shutdown 0.5 µA (max.)
• Duty ratio : 50 % / 75 % built-in auto-switching-type PFM control circuit (A, B, and D type)
75 % built-in fixed-type PFM control circuit (C type)
• External parts : Coil, capacitor, and diode
• Output voltage : Selectable in 0.1 V steps between 2.0 to 6.5 V (A, B, and C type)
Selectable in 0.1 V steps between 1.5 to 6.5 V (D type)
• Output voltage accuracy : ±2.4%
• Shutdown function (A type)
www.DataSVheDeDt4/ UV.OcUoTmseparate type (D type)
• External transistor type available (S-8352 Series)
• Lead-free products
„ Applications
• Power supplies for portable equipment such as digital cameras, electronic notebooks, and PDAs
• Power supplies for audio equipment such as portable CD / MD players
• Constant voltage power supplies for cameras, video equipment, and communications equipment
• Power supplies for microcomputers
„ Packages
Package Name
SOT-23-3
SOT-23-5
SOT-89-3
Package
MP003-A
MP005-A
UP003-A
Drawing Code
Tape
MP003-A
MP005-A
UP003-A
Reel
MP003-A
MP005-A
UP003-A
Seiko Instruments Inc.
1


Seiko Instruments Electronic Components Datasheet

S-8352 Datasheet

(S-8351 / S-8352) SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR

No Preview Available !

STEP-UP, SUPER-SMALL PACKAGE, PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
S-8351/8352 Series
Rev.2.0_00
„ Block Diagrams
1. S-8351 Series
(1) A Type (With Shutdown Function)
CONT
VOUT
Protection
circuit
IC internal
power supply
VREF
PFM
control
circuit
+
VSS
ON / OFF
Figure 1
(2) B and C Types (Without Shutdown Function, VDD / VOUT Non-separate Type)
CONT
VOUT
Protection
circuit
IC internal
power supply
VREF
PFM
control
circuit
+
www.DataSheet4U.com
VSS
Figure 2
(3) D Type (VDD / VOUT Separate Type)
CONT
IC internal power supply
Protection
circuit
PFM
control
circuit
VDD VOUT
VREF
+
Figure 3
VSS
2 Seiko Instruments Inc.


Part Number S-8352
Description (S-8351 / S-8352) SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR
Maker Seiko Instruments
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S-8352 Datasheet PDF






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