Switching Regulators. S-8351 Datasheet

S-8351 Regulators. Datasheet pdf. Equivalent

Part S-8351
Description Switching Regulators
Feature S-8351/8352 Series www.ablicinc.com © ABLIC Inc., 2002-2010 STEP-UP, BUILT-IN / EXTERNAL FET PFM C.
Manufacture ABLIC
Datasheet
Download S-8351 Datasheet

Rev.2.0_00 STEP-UP, SUPER-SMALL PACKAGE, PFM CONTROL SWITCH S-8351 Datasheet
S-8351/8352 Series www.ablicinc.com © ABLIC Inc., 2002-2010 S-8351 Datasheet
Recommendation Recommendation Datasheet S-8351 Datasheet





S-8351
S-8351/8352 Series
www.ablic.com
© ABLIC Inc., 2002-2018
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING
REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.1_00
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 V to 6.5 V (A, B, and C type)
Selectable in 0.1 V steps between 1.5 V to 6.5 V (D type)
• Output voltage accuracy : ±2.4%
• Shutdown function (A type)
• VDD / VOUT separate type (D type)
• External transistor type available (S-8352 Series)
• Lead-free, Sn 100%, halogen-free*1
*1. Refer to “Product Name Structure” for details.
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
• SOT-23-3
• SOT-23-5
• SOT-89-3
1



S-8351
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
S-8351/8352 Series
Rev.3.1_00
Block Diagrams
1. S-8351 Series
(1) A Type (With shutdown function)
CONT
Protection
circuit
IC internal
power supply
VOUT
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
+
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





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