s-8551 Seiko Instruments Inc., s-8551 Datasheet - Page 6

• Manufacturer Part Number: s-8551
• Description: Step-down, Built-in Fet, Synchronous Rectification, Pwm Control Switching Regulators
• Manufacturer: Seiko Instruments Inc.

*1. V
6
Operating input voltage V
Output voltage range
FB voltage
FB voltage temperature
coefficient
FB pin input current
Current consumption
during shutdown
Current consumption 1
Power MOS FET
on-resistance
Power MOS FET
leakage current
Limit current
Oscillation frequency
Soft-start time
High level input voltage V
Low level input voltage
High level input current I
Low level input current
UVLO detection voltage
STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550/8551 Series
Electrical Characteristics
External Parts When Measuring Electrical Characteristics
V
For details, refer to “
Inductor
Input capacitor
Output capacitor
Output voltage set resistor 1
Output voltage set resistor 2
Phase compensation capacitor C
OUT(S)
OUT(S)
Parameter
is the output voltage set value, and V
can be set depending on the ratio between the V
Element Name
*1
V
V
I
I
I
R
R
I
I
f
t
V
I
V
Symbol
FB
SSS
SS1
LSW
LIM
osc
SS
SH
SL
∆V
∆Ta
External Parts Selection”
IN
OUT
FB
PFET
NFET
SH
SL
UVLO
(Unless otherwise specified: V
FB
V
V
V
V
V
V
Ta = −40°C to +85°C
V
V
V
f
V
I
I
V
V
Time required to reach 90% of
V
osc
CONT
CONT
IN
IN
IN
IN
L
C
C
R
R
Symbol
IN
IN
IN
IN
ON/OFF
FB
IN
ON/OFF
OUT(S)
IN
OUT
FB1
FB2
FB
= 2.0 V to 5.5 V, ON/OFF pin
= 2.0 V to 5.5 V, ON/OFF pin
= 2.0 V to 5.5 V, ON/OFF pin
= 2.0 V to 5.5 V, ON/OFF pin
= 1.2 MHz, no external parts,
= V
= V
= 2.0 V to 5.5 V, FB pin
= 2.0 V to 5.5 V,
= 2.0 V to 5.5 V,
= V
= 100 mA
= −100 mA
Table 4 Electrical Characteristics
OUT(S)
OUT(S)
FB(S)
= 0 V
= 0 V, V
Conditions
Constant
× 1.1 V
OUT
Table 5 External Parts
+ 0.4 V to 5.5 V
+ 0.4 V to 5.5 V
3.3 µH
4.7 µF
Seiko Instruments Inc.
68 pF
10 µF
36 kΩ
18 kΩ




CONT
is the typ. value of the actual output voltage.
.
= 0
IN
Murata Manufacturing Co., Ltd.
FB
or
= 3.6 V, V
value and output voltage set resistors (R
3.6 V
Taiyo Yuden Co., Ltd.
TDK Corporation
TDK Corporation
Rohm Co., Ltd.
Rohm Co., Ltd.
Manufacturer
OUT
0.588
−0.1
1.02
−0.1
−0.1
Min.
800
2.0
1.1
0.7
0.9
1.4







= 1.8 V (the conditions in Table 5), Ta = 25°C)
±0.01
±100
1000
Typ.
200
0.6
0.4
0.3
1.2
1.0
1.6








0.612
NR4018T3R3M
C3216X7R1E475K
C3216X7R1C106K
MCR03 Series 3602
MCR03 Series 1802
GRM1882C1H680J
Max.
1200
+0.1
±0.5
1.38
1.78
400
5.5
4.0
1.0
0.6
0.5
1.3
0.3
0.1
0.1


Part Number
ppm/°C
MHz
Unit
FB1
mA
ms
µA
µA
µA
µA
µA
µA
Ω
V
V
V
V
V
V
, R
Rev.2.1
FB2
).
Circuit
Test
2
2
2
2
1
1
1
1
1
1
2
2
2
2
1
1
2
_01