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S-8521E30MC-BLPT2x Datasheet(PDF) 10 Page - Seiko Instruments Inc

Part No. S-8521E30MC-BLPT2x
Description  STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-8521E30MC-BLPT2x Datasheet(HTML) 10 Page - Seiko Instruments Inc

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STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series
Rev.9.0_01
10
2. C type, D type
Table 6
(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
C type
2.5
10.0
V
2
D type
2.5
16.0
V
2
Current consumption 1
ISS1
VOUT = VOUT(S)
× 1.2
10
21
μA
2
Current consumption
during shutdown
ISSS
VON/OFF
______
= 0 V
0.5
μA
2
EXT pin output current
IEXTH
VEXT = VIN
− 0.4 V
S-8520/8521x15 to 24
−2.3
−4.5
mA
S-8520/8521x25 to 34
−3.7
−7.0
mA
S-8520/8521x35 to 44
−5.3
−9.3
mA
S-8520/8521x45 to 54
−6.7
−11.3
mA
S-8520/8521x55 to 60
−8.0
−13.3
mA
IEXTL
VEXT = 0.4 V
S-8520/8521x15 to 24
+4.3
+8.4
mA
S-8520/8521x25 to 34
+7.0
+13.2
mA
S-8520/8521x35 to 44
+9.9
+17.5
mA
S-8520/8521x45 to 54
+12.6
+21.4
mA
S-8520/8521x55 to 60
+15.0
+25.1
mA
Line regulation
ΔVOUT1
VOUT(S)
≤ 2.0 V VIN = 2.5 V to 2.94 V
30
60
mV
3
VOUT(S)
> 2.0 V VIN = VOUT(S) × 1.2 to 1.4
30
60
mV
3
Load regulation
ΔVOUT2
Load current = 10
μA to IOUT × 1.25
30
60
mV
3
Output voltage
temperature coefficient
ΔVOUT
ΔTa
Ta =
−40°C to +85°C
±VOUT(S)
× 5E − 5
V/°C
3
Oscillation frequency
fosc
Measure waveform at
EXT pin.
VOUT(S)
≤ 2.4 V
45
60
75
kHz
3
VOUT(S)
≥ 2.5 V
48
60
72
kHz
3
PWM / PFM control
switching duty ratio
(S-8521 Series)
PFMDuty No load, measured waveform at EXT pin.
15
25
40
%
3
ON/OFF pin
input voltage
VSH
Determine oscillation at EXT pin
1.8
V
2
VSL
Determine oscillation stop at EXT pin
0.3
V
2
ON/OFF pin
input leakage current
ISH
−0.1
0.1
μA
1
ISL
−0.1
0.1
μA
1
Soft start time
tss
6.0
12.0
24.0
ms
3
Overload detection time
(C type)
tpro
Time until the EXT pin reaches VIN after
dropping VOUT to 0 V.
7.0
14.0
28.0
ms
2
Efficiency
EFFI
93
%
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 k
Ω
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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