S-8540A25FN-IAKT2z datasheet(7/36 Pages) SII

Part #	S-8540A25FN-IAKT2z

Description	STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

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Manufacturer	SII [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)

× 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

V

Ta V

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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S-8540A25FN-IAKT2z Datasheet(PDF) 7 Page - Seiko Instruments Inc

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