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S-8540A60FN-IADT2S Datasheet(PDF) 7 Page - Seiko Instruments Inc

Part # S-8540A60FN-IADT2S
Description  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-8540A60FN-IADT2S Datasheet(HTML) 7 Page - Seiko Instruments Inc

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STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.4.0_01
S-8540/8541 Series
7
Electrical Characteristics
1. S-8540/8541 Series A, C types
Table 5
(Ta = 25
°C, unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Measure-
ment
Circuit
Output voltage *1
VOUT (E)
VIN = VOUT (S)
× 1.5
IOUT = 120 mA
VOUT (S)
× 0.980
VOUT (S)
VOUT (S)
× 1.020
V
2
Input voltage
VIN
2.5
10.0
V
1
Current consumption 1
ISS1
VIN = VOUT (S)
× 1.5
100 % duty ratio
S-8540/8541Axx
180
300
μA
1
S-8540/8541Cxx
140
240
Current consumption
during shutdown
ISSS
VON/OFF = 0 V
VOUT = VOUT (S)
× 0.95
1.0
μA
1
EXT pin output current
IEXTH
VIN = 10 V, VEXT = VIN
− 0.2 V
− 32
− 48
mA
1
IEXTL
VIN = 10 V, VEXT = 0.2 V
45
66
mA
1
Line regulation
ΔVOUT1
VOUT (S)
× 1.1 ≤ VIN ≤ 10 V, IOUT = 120 mA
30
60
mV
2
Load regulation
ΔVOUT2
VIN = VOUT (S)
× 1.5, 10 μA ≤ IOUT ≤ 150 mA
30
60
mV
2
Output voltage temperature
coefficient
Δ
Δ
V
Ta V
OUT
OUT
VIN = VOUT (S)
× 1.5, IOUT = 120 mA
− 40 ≤ Ta ≤ + 85 °C
± 100
ppm/
°C
2
Oscillation frequency
fOSC
Measure waveform at the EXT
pin.
S-8540/8541Axx
510
600
690
kHz
2
S-8540/8541Cxx
255
300
345
Maximum duty ratio
MaxDuty
Measure waveform at the EXT pin.
100
%
2
PWM/PFM-control switch
duty ratio *2
PFMDuty
VIN = VOUT (S)
× 1.5, no load
19
29
39
%
2
Current limit detection
voltage
VSENSE
VIN = VOUT (S)
× 1.5,
Measure waveform at the EXT pin.
100
125
150
mV
1
SENSE pin input current
ISENSE
VIN = VOUT (S)
× 1.5, VSENSE = VIN − 0.1 V
6.7
11.2
16.8
μA
1
Shutdown pin
input voltage
VSH
VIN = VOUT (S)
× 1.5, Judge VOUT(S) × 0.98.
2.3
V
2
VSL
VIN = VOUT (S)
× 1.5, Judge CVREF pin "L".
0.3
V
1
Shutdown pin
input leakage current
ISH
VIN = VOUT (S)
× 1.5, VON/OFF = VOUT
− 0.1
0.1
μA
1
ISL
VIN = VOUT (S)
× 1.5, VON/OFF = 0 V
− 0.1
0.1
μA
1
Soft-start time
tSS
Time until VOUT (E) reaches 90% or higher of the VOUT(S)
7.0
12.0
17.0
ms
2
Efficiency
EFFI
90
%
2
External components
Coil (L)
:Sumida Corporation. CDRH6D28-100
Diode (SD)
:Matsushita Electric Inducstrial Co., Ltd. MA2Q737 (Schottky diode)
Output capacitor (COUT)
:Nichicon Corporation F93 (16 V, 47
μF, tantalum)
Input capacitor (CIN)
:Nichicon Corporation F93 (16 V, 47
μF, tantalum)
Transistor (PSW)
:Toshiba Corporation 2SA1213
Base resistor (Rb)
:100 m
Ω
Base capacitor (Cb)
:2200 pF
CVL
:1.0
μF
CSS
:0.047
μF
RSS
:220 k
Ω
RSENSE
:100 m
Ω
Condition: Recommended parts are used unless otherwise specified.
VIN =VOUT (S)
×1.5 V, IOUT = 120 mA (When VOUT (S) ≤ 1.6 V, then VIN = 2.5 V)
*1. VOUT (S) : Specified output voltage value, VOUT (E) : Actual output voltage value
*2. Applied to the S-8541 series only
Caution 1. Line regulation and load regulation may change greatly due to GND wiring when VIN is high.
2. In the S-8540 series (PWM control), a state in which the duty ratio 0% continues for several
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.


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