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S-8521B40MC-ATZT2U

Description
Switching Controllers Step Down SWR PWM/ PFM 180kHz 60uA Iq
CategoryPower/power management    The power supply circuit   
File Size623KB,45 Pages
ManufacturerABLIC
Environmental Compliance
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S-8521B40MC-ATZT2U Overview

Switching Controllers Step Down SWR PWM/ PFM 180kHz 60uA Iq

S-8521B40MC-ATZT2U Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
MakerABLIC
Parts packaging codeSOT-23
package instructionSOT-23, 5 PIN
Contacts5
Reach Compliance Codecompliant
ECCN codeEAR99
Other featuresALSO OPERATES AS PFM
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage16 V
Minimum input voltage2.5 V
JESD-30 codeR-PDSO-G5
JESD-609 codee3
length2.9 mm
Number of functions1
Number of terminals5
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current0.05 A
Nominal output voltage4 V
Package body materialPLASTIC/EPOXY
encapsulated codeLSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, LOW PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height1.3 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency207 kHz
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceTIN
Terminal formGULL WING
Terminal pitch0.95 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width1.6 mm
S-8520/8521 Series
www.ablicinc.com
© ABLIC Inc., 1997-2010
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE
SWITCHING REGULATOR CONTROLLER
Rev.9.0
_02
The S-8520/8521 Series is a CMOS step-down switching regulator-controller with PWM control (S-8520 Series) and PWM
/ PFM switching control (S-8521 Series). The S-8520/8521 Series has a reference voltage source, an oscillation circuit, an
error amplifier, and other components.
The S-8520 Series provides low-ripple power, high efficiency, and excellent transient characteristics due to a PWM control
circuit capable of varying the duty ratio linearly from 0% up to 100%. The S-8520/8521 Series also has a soft-start circuit
that prevents overshoot at startup.
The S-8521 Series works with either PWM control or PFM control. It normally operates using PWM control with a duty ratio
of 25% to 100%, but under a light load, it automatically switches to PFM control with a duty ratio of 25%. The S-8520/8521
Series ensures high efficiency over a wide range of conditions for devices, from the standby mode to the operation.
By adding external Pch power MOS FET or PNP transistor, coil, capacitor, and externally connected diode, the
S-8520/8521 Series can function as a step-down switching regulator, and is ideal for power supply units of portable
devices due to small SOT-23-5 and the feature of low current consumption. It is also ideal for AC adapters due to the input
voltage up to 16 V.
Features
Low current consumption
60
A
max. (A, B types)
21
A
max. (C, D types)
100
A
max. (E, F types)
During shutdown: 0.5
A
max.
Input voltage:
2.5 V to 16 V (B, D, F types)
2.5 V to 10 V (A, C, E types)
Output voltage:
Selectable between 1.5 V and 6.0 V in 0.1 V step
Duty ratio:
0% to 100% PWM control (S-8520 Series)
25% to100% PWM / PFM switching control (S-8521 Series)
External parts are Pch power MOS FET or PNP transistor, coil, diode, and capacitor only
(When using PNP transistor, add base resistor and capacitor).
Oscillation frequency:
180 kHz typ. (A, B types)
60 kHz typ. (C, D types)
300 kHz typ. (E, F types)
Soft-start function:
8 ms. typ.
(A, B types)
12 ms. typ. (C, D types)
4.5 ms. typ. (E, F types)
With a shutdown function
With a built-in overload protection circuit Overload detection time:
4 ms. typ.
(A type)
14 ms. typ. (C type)
2.6 ms. typ. (E type)
*1
Lead-free, Sn 100%, halogen-free
During operation:
*1.
Refer to “
Product Name Structure”
for details.
1
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