S-8550AA-M5T1X Datasheet, PDF (6/31 Pages) Seiko Instruments Inc – RECTIFICATION, PWM CONTROL SWITCHING REGULATORS

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550 Series
Rev.5.0_01
 Electrical Characteristics
Table 4 Electrical Characteristics
(Unless otherwise specified: VIN = 3.6 V, VOUT = 1.8 V (the conditions in Table 5), Ta = +25°C)
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Test
Circuit
Operating input voltage VIN
Output voltage range^*1 VOUT
FB voltage
VFB
FB voltage temperature ΔVFB
coefficient
ΔTa
−
VIN = VOUT(S) + 0.4 V to 5.5 V
VIN = VOUT(S) + 0.4 V to 5.5 V
Ta = −40°C to +85°C
2.0
−
5.5
V
2
1.1
−
4.0
V
2
0.588
0.6
0.612
V
2
−
±100
− ppm/°C
2
FB pin input current
IFB
Current consumption
during shutdown
ISSS
VIN = 2.0 V to 5.5 V, FB pin
VIN = 2.0 V to 5.5 V,
VON/OFF = 0 V
−0.1
−
+0.1
μA
1
−
−
1.0
μA
1
Current consumption 1 ISS1
fosc = 1.2 MHz, no external parts,
VFB = VFB(S) × 1.1 V
−
200
400
μA
1
Power MOS FET
on-resistance
RPFET
RNFET
ICONT = 100 mA
ICONT = −100 mA
−
−
0.4
0.6
0.3
0.5
Ω
1
Power MOS FET
leakage current
ILSW
VIN = 2.0 V to 5.5 V,
VON/OFF = 0 V, VCONT = 0 or 3.6 V
−
±0.01 ±0.5
μA
1
Limit current
ILIM
−
800
1000 1200
mA
1
Oscillation frequency fosc
−
1.02
1.2
1.38 MHz
2
Soft-start time
tSS
Time required to reach 90% of
VOUT(S)
0.7
1.0
1.3
ms
2
High level input voltage VSH
VIN = 2.0 V to 5.5 V, ON/OFF pin 0.9
−
−
V
2
Low level input voltage VSL
VIN = 2.0 V to 5.5 V, ON/OFF pin
−
−
0.3
V
2
High level input current ISH
VIN = 2.0 V to 5.5 V, ON/OFF pin −0.1
−
0.1
μA
1
Low level input current ISL
VIN = 2.0 V to 5.5 V, ON/OFF pin −0.1
−
0.1
μA
1
UVLO detection voltage VUVLO
−
1.4
1.6
1.78
V
2
*1. VOUT(S) is the output voltage set value, and VOUT is the typ. value of the actual output voltage.
VOUT(S) can be set depending on the ratio between the VFB value and output voltage set resistors (RFB1, RFB2).
For details, refer to “ External Parts Selection”.
 External Parts When Measuring Electrical Characteristics
Element Name
Inductor
Input capacitor
Output capacitor
Output voltage set resistor 1
Output voltage set resistor 2
Phase compensation capacitor
Symbol
L
CIN
COUT
RFB1
RFB2
CFB
Table 5
Constant
3.3 μH
4.7 μF
10 μF
36 kΩ
18 kΩ
68 pF
External Parts
Manufacturer
Taiyo Yuden Co., Ltd.
TDK Corporation
TDK Corporation
Rohm Co., Ltd.
Rohm Co., Ltd.
Murata Manufacturing Co., Ltd.
Part Number
NR4018T3R3M
C3216X7R1E475K
C3216X7R1C106K
MCR03 Series 3602
MCR03 Series 1802
GRM1882C1H680J
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