MB3821 Datasheet, PDF (6/24 Pages) Fujitsu Component Limited. – 2-ch DC/DC Converter IC With Synchronous Rectifier

MB3821
s ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Pin
No.
Conditions
Output voltage
Output voltage
temperature variation
Input stability
Load stability
Short-circuit output
current
VREF
∆VREF
/VREF
Line
Load
IOS
24 VREF =0 mA
24 Ta = –30°C to +85°C
24 VCC = 4.5 V to 30 V
24 VREF = 0 mA to –1.0 mA
24 VREF = 1 V
(VCC = 16 V, SEL =0 V, Ta = +25°C)
Value
Unit
Min. Typ. Max.
2.45 2.50 2.55 V
— 0.5* — %
— — 15 mV
— — 15 mV
–60 –25 — mA
Threshold voltage
VTH 4,21 VCC =
3.2 3.5 3.8 V
Hysteresis width
VH 4,21
—
— 0.18 — V
Reset voltage
VRST 4,21
—
2.4 2.8 — V
Charge current
ICS 4,21
—
–1.4 –1.0 –0.6 µA
Input standby voltage VSTB 4,21
—
— 50 100 mV
Threshold voltage
VTH 4,21
—
0.63 0.68 0.73 V
Input source current
ICSCP
22
—
–1.4 –1.0 –0.6 µA
Short detection time
tSCP
22 CSCP = 0.01 µF
4.5 6.8 12.2 ms
Input standby voltage VSTB 22
—
— 50 100 mV
Input latch voltage
VI
22
—
— 50 100 mV
Oscillator frequency
fOSC
8,11, CT = 500pF,
14,17 RT = 10 kΩ
SEL = 0 V 180 200 220 kHz
SEL = 5 V 16 20 24 kHz
Mode select voltage
VLOW
VHI
7 Low power mode
7 Normal mode
2.0 — — V
— — 1.0 V
Input current
ISEL
7 SEL = 5 V
— 50 80 µA
Frequency stability for
voltage
∆f/fdv
8,11,
14,17
CT = 500pF,
RT = 10 kΩ
VCC = 4.5V to 30V
SEL = 0 V
SEL = 5 V
—
—
1
1
10 %
10 %
Frequency stability for
temperature
∆f/fdt
8,11,
14,17
CT = 500pF,
SEL = 0 V
RT = 10 kΩ
Ta = –30°C to +85°C ^{SEL = 5 V}
—
—
1*
1*
—%
—%
*: Standard design value.
(Continued)
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