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PDF S-8520 Data sheet ( Hoja de datos )

Número de pieza S-8520
Descripción PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Fabricantes Seiko Instruments 
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No Preview Available ! S-8520 Hoja de datos, Descripción, Manual

S-8520/8521 Series
www.sii-ic.com
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE
SWITCHING REGULATOR CONTROLLER
© SII Semiconductor Corporation, 1997-2010
Rev.9.0_01
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 During operation: 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)
Lead-free, Sn 100%, halogen-free*1
*1. Refer to “Product Name Structure” for details.
1

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S-8520 pdf
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_01
S-8520/8521 Series
3. Product name list
3. 1 S-8520 Series
Output voltage [V]
1.5
1.8
2.0
2.1
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
4.0
4.3
5.0
5.3
Table 1 (1 / 2)
S-8520AxxMC Series
S-8520BxxMC Series
S-8520B15MC-ARAT2x
S-8520B18MC-ARDT2x
S-8520A20MC-AVFT2x
S-8520A21MC-AVGT2x
S-8520B24MC-ARJT2x
S-8520A25MC-AVKT2x
S-8520B25MC-ARKT2x
S-8520A26MC-AVLT2x
S-8520A27MC-AVMT2x S-8520B27MC-ARMT2x
S-8520A28MC-AVNT2x
S-8520B28MC-ARNT2x
S-8520A29MC-AVOT2x S-8520B29MC-AROT2x
S-8520A30MC-AVPT2x
S-8520B30MC-ARPT2x
S-8520A31MC-AVQT2x S-8520B31MC-ARQT2x
S-8520A32MC-AVRT2x
S-8520B32MC-ARRT2x
S-8520A33MC-AVST2x
S-8520B33MC-ARST2x
S-8520A34MC-AVTT2x
S-8520B34MC-ARTT2x
S-8520A35MC-AVUT2x
S-8520B35MC-ARUT2x
S-8520A36MC-AVVT2x
S-8520B36MC-ARVT2x
S-8520B40MC-ARZT2x
S-8520B43MC-ASCT2x
S-8520A50MC-AWJT2x S-8520B50MC-ASJT2x
S-8520B53MC-ASMT2x
S-8520CxxMC Series
S-8520C25MC-BRKT2x
S-8520C27MC-BRMT2x
S-8520C28MC-BRNT2x
S-8520C29MC-BROT2x
S-8520C30MC-BRPT2x
S-8520C31MC-BRQT2x
S-8520C32MC-BRRT2x
S-8520C33MC-BRST2x
S-8520C34MC-BRTT2x
S-8520C35MC-BRUT2x
S-8520C36MC-BRVT2x
S-8520C50MC-BSJT2x
Output voltage [V]
1.5
1.6
1.8
2.0
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
4.0
4.5
5.0
5.2
5.5
6.0
Table 1 (2 / 2)
S-8520DxxMC Series
S-8520ExxMC Series
S-8520E15MC-BJAT2x
S-8520E16MC-BJBT2x
S-8520E18MC-BJDT2x
S-8520D25MC-BVKT2x
S-8520E25MC-BJKT2x
S-8520D27MC-BVMT2x
S-8520D28MC-BVNT2x
S-8520D29MC-BVOT2x
S-8520D30MC-BVPT2x
S-8520D31MC-BVQT2x
S-8520D32MC-BVRT2x
S-8520D33MC-BVST2x
S-8520D34MC-BVTT2x
S-8520D35MC-BVUT2x
S-8520D36MC-BVVT2x
S-8520E28MC-BJNT2x
S-8520E30MC-BJPT2x
S-8520E33MC-BJST2x
−−
S-8520D50MC-BWJT2x
S-8520E50MC-BKJT2x
S-8520E52MC-BKLT2x
−−
−−
S-8520FxxMC Series
S-8520F15MC-BNAT2x
S-8520F18MC-BNDT2x
S-8520F20MC-BNFT2x
S-8520F25MC-BNKT2x
S-8520F26MC-BNLT2x
S-8520F27MC-BNMT2x
S-8520F28MC-BNNT2x
S-8520F30MC-BNPT2x
S-8520F31MC-BNQT2x
S-8520F33MC-BNST2x
S-8520F34MC-BNTT2x
S-8520F35MC-BNUT2x
S-8520F36MC-BNVT2x
S-8520F40MC-BNZT2x
S-8520F45MC-BOET2x
S-8520F50MC-BOJT2x
S-8520F55MC-BOOT2x
S-8520F60MC-BOTT2x
Remark 1. Please contact our sales office for products with output voltage other than those specified above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
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S-8520 arduino
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_01
S-8520/8521 Series
3. E type, F type
Table 7
(Ta = +25°C unless otherwise specified)
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
Output voltage*1
VOUT(E)
VOUT(S)
× 0.976
VOUT(S)
VOUT(S)
× 1.024
V
3
Input voltage
VIN
E type
F type
2.5
10.0 V
2
2.5
16.0 V
2
Current consumption 1
Current consumption
during shutdown
ISS1
ISSS
VOUT = VOUT(S) × 1.2
V = 0 V______
ON/OFF
60 100 μA 2
− − 0.5 μA 2
S-8520/8521x15 to 24 2.3 4.5
mA
S-8520/8521x25 to 34 3.7 7.0
mA
IEXTH
VEXT = VIN 0.4 V S-8520/8521x35 to 44 5.3
S-8520/8521x45 to 54 6.7
9.3
11.3
mA
mA
EXT pin output current
S-8520/8521x55 to 60 8.0
S-8520/8521x15 to 24 +4.3
13.3
+8.4
mA
mA
S-8520/8521x25 to 34 +7.0 +13.2
mA
IEXTL
VEXT = 0.4 V
S-8520/8521x35 to 44 +9.9 +17.5
S-8520/8521x45 to 54 +12.6 +21.4
mA
mA
S-8520/8521x55 to 60 +15.0 +25.1
mA
Line regulation
Load regulation
Output voltage
temperature coefficient
ΔVOUT1
ΔVOUT2
ΔVOUT
ΔTa
VOUT(S) 2.0 V VIN = 2.5 V to 2.94 V
VOUT(S) > 2.0 V VIN = VOUT(S) × 1.2 to 1.4
Load current = 10 μA to IOUT × 1.25
Ta = 40°C to +85°C
30 60 mV 3
30 60 mV 3
30 60 mV 3
±VOUT(S)
× 5E 5
V/°C
3
Oscillation frequency
PWM / PFM control
fosc
Measure waveform at VOUT(S) 2.4 V 225 300 375 kHz 3
EXT pin.
VOUT(S) 2.5 V 240 300 360 kHz 3
switching duty ratio
PFMDuty No load, measure waveform at EXT pin.
15
25
40 % 3
(S-8521 Series)
ON/OFF pin
VSH Determine oscillation at EXT pin
1.8
V2
input voltage
ON/OFF pin
VSL Determine oscillation stop at EXT pin
0.3 V
2
ISH
0.1
0.1 μA 1
input leakage current
ISL
0.1
0.1 μA 1
Soft start time
tss
2.0 4.5 9.2 ms 3
Overload detection time
(E type)
tpro
Time until the EXT pin reaches VIN after
dropping VOUT to 0 V.
1.3
2.6
4.5 ms 2
Efficiency
EFFI
− − 90 % 3
External parts Coil:
Sumida Corporation CD54 (47 μH)
Diode:
Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type)
Capacitor:
Matsushita Electric Industrial Co., Ltd. TE (16 V, 22 μF tantalum type)
Transistor:
Toshiba Corporation 2SA1213
Base resistance (Rb): 0.68 kΩ
Base capacitor (Cb): 2200 pF (Ceramic type)
Unless otherwise indicated, connect the recommended components to the IC. When VIN = VOUT(S) × 1.2 V (VIN = 2.5 V
______
when VOUT(S) 2.0 V), IOUT = 120 mA, connect the ON/OFF pin to the VIN pin.
*1. VOUT(S): Specified output voltage value, VOUT(E): Actual output voltage value
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