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S-8520A32MC-AVRT2G

Description
switching controllers 3.2V step-down pwm
Categorysemiconductor    Other integrated circuit (IC)   
File Size542KB,45 Pages
ManufacturerSeiko
Environmental Compliance
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S-8520A32MC-AVRT2G Overview

switching controllers 3.2V step-down pwm

S-8520/8521 Series
www.sii-ic.com
© Seiko Instruments Inc., 1997-2010
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE
SWITCHING REGULATOR CONTROLLER
Rev.9.0
_00
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
μA
max. (A, B types)
21
μA
max. (C, D types)
100
μA
max. (E, F types)
During shutdown: 0.5
μA
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:
Product Name Structure”
for details.
*1.
Refer to “
Seiko Instruments Inc.
1
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