S-8550 Datasheet, PDF (6/26 Pages) Seiko Instruments Inc – STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECIFICATION, PWM CONTROL SWITCHING REGULATORS

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550/8551 Series
Rev.2.1_01
„ Electrical Characteristics
Table 4 Electrical Characteristics
(Unless otherwise specified: V_IN = 3.6 V, V_OUT = 1.8 V (the conditions in Table 5), Ta = 25°C)
Parameter
Symbol
Conditions
Test
Min.
Typ.
Max.
Unit _Circuit
Operating input voltage V_IN
Output voltage range^*1 V_OUT
FB voltage
V_FB
FB voltage temperature ∆VFB
coefficient
∆Ta

V_IN = V_OUT(S) + 0.4 V to 5.5 V
V_IN = V_OUT(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
I_FB
Current consumption
during shutdown
I_SSS
V_IN = 2.0 V to 5.5 V, FB pin
V_IN = 2.0 V to 5.5 V,
VON/OFF = 0 V
−0.1

+0.1
µA
1


1.0
µA
1
Current consumption 1 I_SS1
f_osc = 1.2 MHz, no external parts,
V_FB = V_FB(S) × 1.1 V

200
400
µA
1
Power MOS FET
on-resistance
R_PFET
R_NFET
I_CONT = 100 mA
I_CONT = −100 mA

0.4
0.6
Ω
1

0.3
0.5
Power MOS FET
leakage current
I_LSW
V_IN = 2.0 V to 5.5 V,
VON/OFF = 0 V, V_CONT = 0 or 3.6 V

±0.01 ±0.5
µA
1
Limit current
I_LIM

800
1000 1200 mA
1
Oscillation frequency f_osc

1.02
1.2
1.38 MHz
2
Soft-start time
Time required to reach 90% of
t_SS
V_OUT(S)
0.7
1.0
1.3
ms
2
High level input voltage V_SH
V_IN = 2.0 V to 5.5 V, ON/OFF pin 0.9


V
2
Low level input voltage V_SL
V_IN = 2.0 V to 5.5 V, ON/OFF pin


0.3
V
2
High level input current I_SH
V_IN = 2.0 V to 5.5 V, ON/OFF pin −0.1

0.1
µA
1
Low level input current I_SL
V_IN = 2.0 V to 5.5 V, ON/OFF pin −0.1

0.1
µA
1
UVLO detection voltage V_UVLO

1.4
1.6
1.78
V
2
*1. V_OUT(S) is the output voltage set value, and V_OUT is the typ. value of the actual output voltage.
V_OUT(S) can be set depending on the ratio between the V_FB value and output voltage set resistors (R_FB1, R_FB2).
For details, refer to “„ External Parts Selection”.
„ External Parts When Measuring Electrical Characteristics
Table 5 External Parts
Element Name
Symbol
Inductor
L
Input capacitor
Output capacitor
Output voltage set resistor 1
Output voltage set resistor 2
Phase compensation capacitor
C_IN
C_OUT
R_FB1
R_FB2
C_FB
Constant
3.3 µH
4.7 µF
10 µF
36 kΩ
18 kΩ
68 pF
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
6
Seiko Instruments Inc.