S-8521A33MC-AXST2G Seiko Instruments, S-8521A33MC-AXST2G Datasheet - Page 10
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S-8521A33MC-AXST2G
Manufacturer Part Number
S-8521A33MC-AXST2G
Description
IC REG PWM/PFM 180KHZ SOT23-5
Manufacturer
Seiko Instruments
Type
Step-Down (Buck)r
Datasheet
1.S-8520A21MC-AVGT2G.pdf
(44 pages)
Specifications of S-8521A33MC-AXST2G
Internal Switch(s)
No
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3V
Current - Output
120mA
Frequency - Switching
180kHz
Voltage - Input
2.5 ~ 10 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Power - Output
250mW
Output Voltage
3.3 V
Output Current
120 mA
Input Voltage
2.5 V to 10 V
Duty Cycle (max)
100 %
Switching Frequency
180 KHz
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
ON/OFF
Soft start time
Overload detection time
(C type)
Efficiency
External parts
Unless otherwise indicated, connect the recommended components to the IC. When V
when V
*1.
10
input voltage
input leakage current
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series
2. C type, D type
______
______
V
OUT(S)
OUT(S)
pin
pin
Item
: Specified output voltage value, V
≤ 2.0 V), I
*1
Coil:
Diode:
Capacitor:
Transistor:
Base resistance (R
Base capacitor (C
OUT
f
V
V
I
I
I
I
ΔV
ΔV
PFMDuty No load, measured waveform at EXT pin.
V
V
I
I
t
t
EFFI
= 120 mA, connect the ON/OFF
SS1
SSS
EXTH
EXTL
osc
SH
SL
ss
pro
ΔV
Symbol
OUT(E)
IN
SH
SL
ΔTa
OUT1
OUT2
OUT
b
):
b
):
V
V
V
V
V
V
Load current = 10 μA to I
Ta = −40°C to +85°C
Measure waveform at
EXT pin.
Determine oscillation at EXT pin
Determine oscillation stop at EXT pin
Time until the EXT pin reaches V
dropping V
OUT
ON/OFF
EXT
EXT
OUT(S)
OUT(S)
______
Sumida Corporation CD54 (47 μH)
Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type)
Matsushita Electric Industrial Co., Ltd. TE (16 V, 22 μF tantalum type)
Toshiba Corporation 2SA1213
0.68 kΩ
2200 pF (Ceramic type)
= V
= 0.4 V
= V
≤ 2.0 V
> 2.0 V
OUT(E)
−
= 0 V
IN
OUT(S)
− 0.4 V
OUT
Seiko Instruments Inc.
: Actual output voltage value
× 1.2
to 0 V.
Conditions
______
V
V
IN
IN
Table 6
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
−
−
−
−
−
= 2.5 V to 2.94 V
= V
pin to the VIN pin.
OUT(S)
OUT
V
V
× 1.25
OUT(S)
OUT(S)
× 1.2 to 1.4
≤ 2.4 V
≥ 2.5 V
IN
after
× 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
−
−
−
−
−
−
−
−
IN
× 5E − 5
±V
V
= V
−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
OUT(S)
60
60
25
93
−
−
−
−
−
−
−
OUT(S)
× 1.024
V
× 1.2 V (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
−
−
−
−
−
−
−
−
−
−
−
−
−
Rev.9.0
V/°C
Unit
kHz
kHz
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mV
mV
mV
μA
μA
μA
μA
ms
ms
%
%
V
V
V
V
V
IN
= 2.5 V
Circuit
Test
_00
3
2
2
2
2
−
−
−
−
−
−
−
−
−
−
3
3
3
3
3
3
3
2
2
1
1
3
2
3