s-8541c32fn-iirt2g Seiko Instruments Inc., s-8541c32fn-iirt2g Datasheet - Page 7

• Manufacturer Part Number: s-8541c32fn-iirt2g
• Description: Step-down, 600 Khz Pwm Control Or Pwm/pfm Switchable Switching Regulator Controller
• Manufacturer: Seiko Instruments Inc.

Caution 1. Line regulation and load regulation may change greatly due to GND wiring when V
Parameter
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
Shutdown pin
input leakage current
Soft-start time
Efficiency
Rev.3.2
input voltage
External components
Electrical Characteristics
Condition: Recommended parts are used unless otherwise specified.
*1. V
*2. Applied to the S-8541 series only
1. S-8540/8541 Series A, C types
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Coil (L)
Diode (SD)
Output capacitor (C
Input capacitor (C
Transistor (P
Base resistor (R
Base capacitor (C
C
C
R
R
VL
SS
SS
SENSE
*2
OUT (S)
2. In the S-8540 series (PWM control), a state in which the duty ratio 0% continues for several
_00
*1
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.
: Specified output voltage value, V
V
IN
=V
SW
OUT (S)
)
b
)
Δ
PFMDuty
MaxDuty
IN
b
Symbol
Ta V
V
ΔV
ΔV
V
Δ
I
)
I
EFFI
I
SENSE
)
OUT (E)
f
I
I
SENSE
V
EXTH
EXTL
V
V
OUT
V
OSC
I
I
t
SS1
SSS
•
SH
SS
OUT1
OUT2
SL
OUT
SH
SL
IN
×1.5 V, I
OUT
)
V
I
V
100 % duty ratio
V
V
V
V
V
V
V
− 40 ≤ Ta ≤ + 85 °C
Measure waveform at the EXT
pin.
Measure waveform at the EXT pin.
V
V
Measure waveform at the EXT pin.
V
V
V
V
V
Time until V
: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
OUT
IN
IN
ON/OFF
OUT
IN
IN
OUT (S)
IN
IN
IN
IN
IN
IN
IN
IN
IN
OUT
= V
= V
= 10 V, V
= 10 V, V
= V
= V
= V
= V
= V
= V
= V
= V
= V
= 120 mA
= V
OUT (S)
OUT (S)
OUT (S)
OUT (S)
OUT (S)
OUT (S)
OUT (S)
OUT (S)
OUT (S)
OUT (S)
OUT (S)
= 0 V
× 1.1 ≤ V
OUT (S)
= 120 mA (When V
OUT (E)
EXT
EXT
× 1.5
× 1.5, no load
× 1.5,
× 1.5
× 1.5, 10 μA ≤ I
× 1.5, I
× 1.5, V
× 1.5, Judge V
× 1.5, Judge CVREF pin "L".
× 1.5, V
× 1.5, V
× 0.95
= V
= 0.2 V
IN
reaches 90% or higher of the V
Seiko Instruments Inc.
≤ 10 V, I
IN
OUT
SENSE
ON/OFF
ON/OFF
Conditions
− 0.2 V
OUT (E)
= 120 mA
Table 5
−
−
= V
OUT
= V
= 0 V
OUT(S)
OUT
IN
OUT
= 120 mA
: Actual output voltage value
≤ 150 mA
− 0.1 V
S-8540/8541Axx
S-8540/8541Cxx
S-8540/8541Axx
S-8540/8541Cxx
× 0.98.
OUT (S)
≤ 1.6 V, then V
OUT(S)
× 0.980
V
(Ta = 25 °C, unless otherwise specified)
− 0.1
− 0.1
Min.
− 32
OUT (S)
510
255
100
100
2.5
6.7
2.3
7.0
45
19
−
−
−
−
−
−
−
−
IN
V
= 2.5 V)
± 100
Typ.
− 48
11.2
12.0
OUT (S)
180
140
600
300
125
66
30
30
29
90
−
−
−
−
−
−
−
S-8540/8541 Series
× 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
ms
μA
μA
°C
%
%
μA
μA
μA
%
V
V
V
V
IN
is high.
Measure-
Circuit
ment
2
1
1
1
1
1
2
2
2
2
2
2
1
1
2
1
1
1
2
2
7