S-8351A50MC-J3JT2G Datasheet, PDF (14/51 Pages) Seiko Instruments Inc – STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER

STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
S-8351/8352 Series
Rev.3.0_00
Table 16 (2 / 2)
(Ta = 25°C unless otherwise specified)
Item
Symbol
Condition
Min. Typ. Max.
Unit
Measurement
circuit
V_SH
V_OUT = V_OUT(S) × 0.95,
Measured oscillation at EXT
0.75 −
−
V
4
ON / OFF pin input voltage
(With shutdown function)
V_SL1
V_OUT = V_OUT(S) × 0.95,
At V_OUT≥1.5 V −
− 0.3
V
Judged oscillation stop at
4
V_SL2
EXT pin
At V_OUT<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)
I_SL
Efficiency
EFFI
V_{ON/ OFF} = 0 V
−
− 0.1 − 0.1 μA
4
S-8352x30
− 83 −
%
3
S-8352x50
− 85 −
%
3
External parts
Coil:
CDRH6D28-101 (100 μH) from Sumida Corporation
Diode:
MA2Z748 (Shottky type) from Matsushita Electric Industrial Co., Ltd.
Capacitor:
F93 (16 V, 47 μF tantalum type) from Nichicon Corporation
Transistor:
CPH3210 from Sanyo Electric Co., Ltd.
Base resistor (Rb): 1 kΩ
Base capacitor (Cb): 2200 pH (ceramic type)
V_IN = V_OUT(S) × 0.6 applied, I_OUT = V_OUT(S) / 100 Ω
With shutdown function :
ON / OFF pin is connected to V_OUT
For V_DD / V_OUT separate type : VDD pin is connected to VOUT pin
Remark 1.
2.
V_OUT(S) specified above is the set output voltage value, and V_OUT is the typical value of the actual output
voltage.
V_DD / V_OUT separate type
A step-up operation is performed from V_DD = 0.8 V. However, 1.8 V≤V_DD<10 V is recommended stabilizing
the output voltage and oscillation frequency. (V_DD≥1.8 V must be applied for products with a set value of less
than 1.9 V.)
14
Seiko Instruments Inc.