S-8540 SII [Seiko Instruments Inc], S-8540 Datasheet - Page 8

• Manufacturer Part Number: S-8540
• Description: STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
• Manufacturer: SII [Seiko Instruments Inc]

2. S-8540/8541 Series B, D types
8
Caution 1. Line regulation and load regulation may change greatly due to GND wiring when 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
Maximum duty ratio
PWM/PFM-control switch
duty ratio
Current limit detection
voltage
SENSE pin input current
Shutdown pin
input voltage
Shutdown pin
input leakage current
Soft-start time
Efficiency
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8540/8541 Series
External components:
Condition: Connect recommended parts unless otherwise specified. V
*1. V
*2. The typical value (specified output voltage value) is V
*3. S-8541 series only
Coil (L)
Diode (SD)
Output capacitor (C
Input capacitor (C
Transistor (P
Base resistor (R
Base capacitor (C
C
C
R
R
R
R
C
OUT (S)
Parameter
VL
SS
SS
SENSE
A
B
FB
*3
2. In the S-8540 series (PWM control), a state in which the duty ratio 0% continues for several
: Specified output voltage value, V
clocks may occur when the input voltage is high and the output current is low. In this case,
the operation changes to the pseudo PFM mode, but the ripple voltage hardly increases.
*1, *2
SW
)
b
)
IN
b
Δ
)
PFM Duty
)
MaxDuty
OUT
Symbol
Ta V
V
ΔV
ΔV
V
Δ
I
I
EFFI
I
SENSE
OUT (E)
f
I
SENSE
V
I
EXTH
EXTL
V
V
V
OSC
I
I
t
SS1
SSS
•
SH
SS
OUT1
OUT2
SL
)
OUT
SH
SL
IN
OUT
:Sumida Corporation CDRH6D28-100
:Matsushita Electric Inducstrial Co., Ltd. MA2Q737 (Schottky diode)
:Nichicon Corporation F93 (16 V, 47 μF, tantalum)
:Nichicon Corporation F93 (16 V, 47 μF, tantalum)
:Toshiba Corporation 2SA1213
:100 mΩ
:2200 pF
:1.0 μF
:0.047 μF
:220 kΩ
:100 mΩ
:200 kΩ
:100 kΩ
:50 pF
V
I
V
100% duty ratio
V
V
V
V
3.3 ≤ V
10 μA ≤ I
V
− 40 ≤ Ta ≤ + 85°C
Measure waveform at
the EXT pin.
Measure waveform at the EXT pin.
V
V
V
V
V
V
V
Time until V
V
OUT
IN
IN
ON/OFF
OUT
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
OUT (S)
= 4.5 V
= 4.5 V
= 10 V, V
= 10 V, V
= V
= V
= 4.5 V, Measure waveform at the EXT pin.
= 4.5 V, V
= 4.5 V, Judge V
= 4.5 V, Judge CVREF pin "L".
= 4.5 V, V
= 4.5 V, V
= 120 mA
= V
OUT (S)
OUT (S)
IN
= 0 V
OUT (S)
OUT
≤ 10 V, I
OUT (E)
OUT (E)
EXT
EXT
≤ 150 mA
× 1.5, I
× 1.5 V, no load
SENSE
ON/OFF
ON/OFF
× 0.95
= V
= 0.2 V
OUT
Seiko Instruments Inc.
reaches 90% or higher of the
= V
: Actual output voltage value
Conditions
IN
= V
= 0 V
OUT
OUT (S)
= 120 mA
− 0.2 V
IN
OUT
= 120 mA
−
−
− 0.1 V
Table 6
OUT (S)
× 0.98.
S-8540/8541B00
S-8540/8541D00
S-8540/8541B00
S-8540/8541D00
= 1 + R
IN
A
/R
=4.5 V, I
B
= 3.0 V. See “Output Voltage adjustment”.
× 0.980
V
− 0.1
− 0.1
Min.
− 32
OUT (S)
510
255
100
100
OUT
2.5
6.7
2.3
7.0
45
19
−
−
−
−
−
−
−
−
(Ta = 25 °C,unless otherwise specified)
=120 mA
= 3.000
V
± 100
Typ.
− 48
11.2
12.0
OUT (S)
180
140
600
300
125
66
30
30
29
90
−
−
−
−
−
−
−
× 1.020
V
Max.
10.0
16.8
17.0
OUT (S)
300
240
690
345
150
1.0
0.3
0.1
0.1
60
60
39
−
−
−
−
−
−
Units
ppm/
kHz
mA
mA
mV
mV
mV
μA
μA
μA
μA
μA
ms
°C
%
%
%
Rev.3.2
V
V
V
V
IN
is high.
Measure-
Circuit
ment
4
3
3
3
3
3
4
4
4
4
4
4
3
3
4
3
3
3
4
4
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