s-8521b51mc-aukt2g Seiko Instruments Inc., s-8521b51mc-aukt2g Datasheet - Page 10

• Manufacturer Part Number: s-8521b51mc-aukt2g
• Description: Step-down, Pwm Control Or Pwm / Pfm Switchable Switching Regulator Controller
• Manufacturer: Seiko Instruments Inc.

External parts Coil:
The recommended components are connected to the IC, unless otherwise indicated.
V
The
*1 . V
10
Output voltage
Input voltage
Current consumption 1
Current consumption
during shutdown
EXT pin output current
Line regulation
Load regulation
Output voltage
temperature coefficient
Oscillation frequency
PWM / PFM control
switching duty ratio
(S-8521 Series)
ON / OFF pin input voltage
ON / OFF pin input
leakage current
Soft start time
Overload detection time
(C type)
Efficiency
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLOR
S-8520 / 8521 Series
IN
= V
2. C type, D type
OUT(S)
ON
OUT(S)
Parameter
/
: Specified output voltage value, V
OFF
× 1.2 V (V
*1
pin is connected to VIN pin.
Diode:
Capacitor:
Transistor:
Base resistance (R
Base capacitor (C
IN
= 2.5 V if V
PFMDuty No load, Measured waveform at EXT pin
∆
Symbol
∆V
∆V
V
∆
EFFI
V
I
I
OUT(E)
I
I
V
V
EXTH
EXTL
V
f
I
t
SS1
SSS
I
t
Ta
osc
SH
pro
SL
OUT1
OUT2
OUT
ss
SH
SL
IN
OUT(S)
V
V
V
V
V
Load current=10 µA to I
Ta=−40 to +85 °C
Measured waveform at
EXT pin.
Judged oscillation at EXT pin
Judged oscillation stop at EXT pin
Duration from the time V
V
0 V to the time the EXT pin obtains V
OUT
EXT
EXT
OUT(S)
OUT(S)
b
ON
): 2200 pF (Ceramic type)
b
=V
=0.4 V
=V
): 0.68 k Ω
/
≤ 2.0 V), I
≤2.0 V
>2.0 V
OFF
Matsushita Electric Industrial Co., Ltd. TE (16 V, 22 µ F tantalum type)
Toshiba Corporation 2SA1213Y
Sumida Corporation CD54 (47 µ H)
Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type)
IN
OUT(S)
−0.4 V

=0 V
×1.2
OUT(E)
OUT
Condition
: Actual output voltage value
= 120 mA
C type
D type
S-8520 / 8521x15 to 24
S-8520 / 8521x25 to 34
S-8520 / 8521x35 to 44
S-8520 / 8521x45 to 54
S-8520 / 8521x55 to 60
S-8520 / 8521x15 to 24
S-8520 / 8521x25 to 34
S-8520 / 8521x35 to 44
S-8520 / 8521x45 to 54
S-8520 / 8521x55 to 60
V
V

IN
IN




Seiko Instruments Inc.
OUT
OUT
Table 6
=2.5 to 2.94 V
=V
V
V
×1.25
OUT(S)
OUT(S)
OUT(S)
is reduced to
≤2.4 V
≥2.5 V
×1.2 to 1.4
IN
.
×0.976
V
+12.6
+15.0
(Ta=25 °C unless otherwise specified)
Min.
−2.3
−3.7
−5.3
−6.7
−8.0
+4.3
+7.0
+9.9
−0.1
−0.1
OUT(S)
2.5
2.5
1.8
6.0
7.0
45
48
15








±V
V
×5E−5
−11.3
−13.3
+13.2
+17.5
+21.4
+25.1
Typ.
−4.5
−7.0
−9.3
+8.4
12.0
14.0
OUT(S)
10
30
30
30
60
60
25
93



OUT(S)




×1.024
V
Max.
10.0
16.0
24.0
28.0
OUT(S)
0.5
0.3
0.1
0.1
21
60
60
60
75
72
40













V / °C
Unit
kHz
mA
mV
ms
µA
µA
%
%
V
V
Rev.8.3
Measure-
circuit
ment

3
2
3
2
1
3
2
3
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