S-8351A20MC-J2FT2X Datasheet, PDF (14/51 Pages) Seiko Instruments Inc – SWITCHING REGULATOR CONTROLLER

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
S-8351/8352 Series
Rev.3.0_01
Table 16 (2 / 2)
(Ta = 25°C unless otherwise specified)
Item
Symbol
Condition
Min. Typ. Max.
Unit
Measurement
circuit
VSH
ON / OFF pin input voltage
(With shutdown function)
VSL1
VOUT = VOUT(S) × 0.95,
Measured oscillation at EXT
0.75 −
−
V
VOUT = VOUT(S) × 0.95,
At VOUT≥1.5 V −
− 0.3
V
Judged oscillation stop at
4
4
VSL2
EXT pin
At VOUT<1.5 V −
− 0.2
V
4
ON / OFF pin input current ^ISH
V_{ON/ OFF} = 10 V
− 0.1 −
0.1
μA
4
(With shutdown function)
ISL
Efficiency
EFFI
V_{ON/ OFF} = 0 V
−
− 0.1 −
0.1
μA
4
S-8352x30
−
83
−
%
3
S-8352x50
−
85
−
%
3
External parts
Coil:
Diode:
CDRH6D28-101 (100 μH) from Sumida Corporation
MA2Z748 (Shottky type) from Matsushita Electric Industrial Co., Ltd.
Capacitor:
Transistor:
F93 (16 V, 47 μF tantalum type) from Nichicon Corporation
CPH3210 from Sanyo Electric Co., Ltd.
Base resistor (Rb): 1 kΩ
Base capacitor (Cb): 2200 pH (ceramic type)
VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 100 Ω
With shutdown function :
ON / OFF pin is connected to VOUT
For VDD / VOUT separate type : VDD pin is connected to VOUT pin
Remark 1.
2.
VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output
voltage.
VDD / VOUT separate type
A step-up operation is performed from VDD = 0.8 V. However, 1.8 V≤VDD<10 V is recommended stabilizing
the output voltage and oscillation frequency. (VDD≥1.8 V must be applied for products with a set value of less
than 1.9 V.)
14