s-8521b51mc-aukt2g Seiko Instruments Inc., s-8521b51mc-aukt2g Datasheet - Page 9

• 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
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
(A type)
Efficiency
Rev.8.3
IN
Electrical Characteristics
=V
1. A type, B type
OUT(S)
ON
OUT(S)
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLOR
Parameter
/
: Specified output voltage value, V
OFF
_00
×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
I
V
I
I
V
OUT(E)
I
EXTH
V
V
EXTL
f
I
t
SSS
I
SS1
t
Ta
osc
SH
pro
SL
OUT1
OUT2
OUT
ss
SH
SL
IN
OUT(S)
b
): 2200 pF (Ceramic type)
b
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
0 V to the time the EXT pin obtains V
V
): 0.68 kΩ
OUT
EXT
EXT
OUT(S)
OUT(S)
≤2.0 V), I
ON
Matsushita Electric Industrial Co., Ltd. TE (16 V, 22µF tantalum type)
Toshiba Corporation 2SA1213Y
Sumida Corporation CD54 (47 µH)
Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type)
=V
=0.4 V
=V
/
≤2.0 V
>2.0 V
OFF
IN
OUT(S)

−0.4 V
OUT(E)
=0 V
×1.2
OUT
: Actual output voltage value
=120 mA
Condition
Seiko Instruments Inc.
A type
B 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 +12.6
S-8520 / 8521x55 to 60 +15.0
V
V
Table 5





IN
IN
=2.5 to 2.94 V
=V
OUT
OUT
OUT(S)
×1.25
is reduced to
V
V
×1.2 to 1.4
OUT(S)
OUT(S)
≤2.4 V
≥2.5 V
IN
.
×0.976
V
−2.3
−3.7
−5.3
−6.7
−8.0
+4.3
+7.0
+9.9
−0.1
−0.1
Min.
144
153
OUT(S)
2.5
2.5
1.8
4.0
2.0
(Ta=25 °C unless otherwise specified)






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
180
180
OUT(S)
8.0
4.0
35
30
30
30
25
93



OUT(S)




S-8520 / 8521 Series
×1.024
V
Max.
10.0
16.0
16.0
216
207
OUT(S)
0.5
0.3
0.1
0.1
8.0
60
60
60
60
40













V / °C
Unit
kHz
mA
mV
ms
µA
µA
%
%
V
V
Measure-
circuit
ment

3
2
3
2
1
3
2
3
9