MB3870 Datasheet, PDF (8/25 Pages) Fujitsu Component Limited. – Pentium II DC/DC Converter IC

MB3870
s ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Pin
no.
Condition
(Ta = +25°C, VCC = 5 V)
Value
Unit
Min. Typ. Max.
Reference
voltage block
(Ref)
Output voltage
Output voltage
temperature
regulation
Input stability
Load stability
Short circuit output
current
VREF
∆VREF
/VREF
Line
Load
IOS
24 VREF = 0 mA
3.465 3.500 3.535 V
24 Ta = –30°C to +85°C* — 0.5 — %
24 VCC = 4.6 V to 18 V
24 IO = 0 mA to –1 mA
24 VREF = 1 V
—
1
10 mV
—
3
10 mV
–20 –10 –3 mA
Under voltage
lockout circuit
block (UVLO)
Soft start block
(CS)
Threshold voltage VTH
Hysteresis voltage VH
Reset voltage
VRST
Charge current
ICS
4 VCC =
4
—
4
—
4
—
3.4 3.7 4.0 V
— 0.18 0.21 V
1.7 2.1 — V
–2.8 –2.0 –1.2 µA
Short circuit
protection
comparator block
(SCP)
Threshold voltage
Input source current
Short detection
interval
VTH
ICSCP
tSCP
4
—
22
—
22 CSCP = 2200 pF
0.63 0.68 0.73 V
–2.8 –2.0 –1.2 µA
0.50 0.75 1.34 ms
Triangular wave
oscillator block
(OSC)
Oscillator frequency fOSC
Frequency
temperature
regulation
∆f/fdt
8, 11 RT = 130 kΩ
180 200 220 kHz
8, 11 Ta = –30°C to +85°C* —
1
—%
Threshold voltage
VTH1
VTH2
6
FB = 1.6 V,
VD4 to VD0 = 00101
1.7784 1.8000 1.8216
V
6
FB = 1.6 V,
VD4 to VD0 = 11010 ^{2.4700 2.5000 2.5300}
V
VTH temperature
regulation
∆VT/VT
6 Ta = –30°C to +85°C* — 0.5 — %
Error amplifier
block (Error
Amp.)
Input bias current IB
Voltage gain
AV
Frequency
bandwidth
BW
5 –IN = 0 V
6 DC
6 AV = 0 dB*
–200 –50 — nA
60 100 — dB
— 800 — kHz
Output voltage
Output source
current
VOH
VOL
ISOURCE
6
—
6
—
6 FB = 1.6 V
2.18 3.5 — V
— 0.8 1.0 V
— –90 –45 µA
Output sink current ISINK
6 FB = 1.6 V
3.0 12.0 — mA
* : Standard design value
(Continued)
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