參數(shù)資料
型號： S-8521A25MC-AXK-T2
英文描述： Analog IC
中文描述： 模擬IC
文件頁數(shù)： 5/37頁
文件大?。?/td> 599K
代理商： S-8521A25MC-AXK-T2
PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
Rev.7.2
S-8520/8521 Series
Seiko Instruments Inc.
5
2. S-8520/21 C & D Series
(Ta = 25
Typ.
o
C unless otherwise specified)
Max.
Units
Parameter
Symbol
Conditions
Min.
Measurement
Circuit
3
Output voltage
VOUT
VOUT
X 0.976
2.5
VOUT
VOUT
X 1.024
10.0
V
Input voltage
VIN
S-8520/21C Series
V
2
S-8520/21D Series
2.5
16.0
Current consumption 1
Current consumption during
power-off
ISS1
ISSS
Vout = Output voltage x 1.2
Power-off pin = 0V
10
21
0.5
μ
A
μ
A
2
2
S-8520/21X15
24
-2.3
-4.5
S-8520/21X25
34
-3.7
-7.0
IEXTH
VEXT = VIN-0.4V
S-8520/21X35
44
-5.3
-9.3
S-8520/21X45
54
-6.7
-11.3
EXT pin output current
S-8520/21X55
60
-8.0
-13.3
mA
S-8520/21X15
24
+4.3
+8.4
S-8520/21X25
34
+7.0
+13.2
IEXTL
VEXT = 0.4V
S-8520/21X35
44
+9.9
+17.5
S-8520/21X45
54
+12.6
+21.4
S-8520/21X55
60
+15.0
+25.1
Line regulation
Load regulation
VOUT1 Vin = Output voltage x1.2 to x1.4 *3
VOUT2 Load current =10
μ
A to IOUT(See below)
x1.25
VOUT
/
Ta
fosc
Measure waveform
at EXT pin
30
30
60
60
mV
mV
3
3
Output voltage temperature
coefficient
Oscillation frequency
Ta = - 40
°
C to 85
°
C
±
VOUT
x 5E-5
60
V/
°
C
3
VOUT
≥
2.5 V
48
72
kHz
3
VOUT
≤
2.4 V
45
60
75
PWM/PFM-control switch
duty ratio *1
Power-Off pin
input voltage
Power-Off pin
input leakage current
Soft-Start time
Overload detection time *2
PFM DutyMeasure waveform at EXT pin under no
load.
VSH
Evaluate oscillation at EXT pin
VSL
Evaluate oscillation stop at EXT pin
ISH
ISL
TSS
TPRO
Duration from the time Vout is reduced to
0 V to the time the EXT pin obtains Vin.
EFFI
15
25
40
%
3
1.8
6.0
7.0
V
2
0.3
0.1
-0.1
24.0
28.0
μ
A
μ
A
ms
ms
1
1
3
2
12.0
14.0
Efficiency
93
%
3
Conditions:
The recommended components are connected to the IC, unless otherwise indicated. Vin = Vout x 1.2 [V],
Iout = 120 [mA] (Vin = 2.5V, if Vout
≤
2.0 V)
Peripheral components:
Coil
: Sumida Electric Co., Ltd. CD54 (47
μ
H).
Diode
: Matsushita Electronics Corporation MA720 (Schottky type).
Capacitor
: Matsushita Electronics Corporation TE (16 V, 22
μ
F tantalum type).
Transistor
: Toshiba 2SA1213Y.
Base resistance (Rb)
: 0.68 k
Base capacitor (Cb)
: 2200 pF (Ceramic type)
The power-off pin is connected to VIN.
Notes:
The output voltage indicated above represents a typical output voltage set up. These specifications apply in
common to both S-8520 and S-8521, unless otherwise noted.
*1: Applicable to the S-8521C Series and S-8521D Series.
*2: Applicable to the S-8520C Series and S-8521C Series.
*3: Vin = 2.5 V to 2.94 V, if Vout
≤
2.0 V.
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