MB39A105 Datasheet, PDF (6/27 Pages) Fujitsu Component Limited. – 1-ch DC/DC Converter IC for low voltage

MB39A105
s ELECTRICAL CHARACTERISTICS
(VCC = 3.3 V, Ta = +25 °C)
Parameter
Symbol
Pin
No
Conditions
Value
Unit
Min Typ Max
1. Under voltage
lockout
protection circuit
block [UVLO]
Threshold voltage
VTLH
3 VCC =
1.15 1.35 1.55 V
Threshold voltage
VTH
2

0.95 1.00 1.05 V
Short-circuit detection time
setting difference voltage
∆VCSCP
2

0.15 0.20 0.25 V
2. Short-circuit
protection block
[SCP]
Input source current
Reset voltage
SCPOD terminal output
leak current
ICSCP
VRST
ILEAK
2 CSCP = 0.85 V
3 VCC =
4 SCPOD = 3.3 V
−1.76 −0.88 −0.44 µA
1.1 1.3 1.5 V

0 1.0 µA
SCPOD terminal output on
resistor
RON
4 SCPOD = 1 mA
 50 100 Ω
3. Triangular
wave oscillator
block [OSC]
Oscillation frequency
Frequency temperature
variation
fosc 5 RT = 7.5 kΩ
450 500 550 kHz
∆fOSC/
fOSC
5 Ta = 0 °C to +85 °C 
1*
%
4. Soft-start block
[CS]
Charge current
ICS
2 CSCP = 0 V
−16 −11 −6 µA
Threshold voltage
VTH
1 FB = 0.5 V
0.495 0.5 0.505 V
Input bias current
IB
1 −INE = 0 V
−120 −30  nA
Voltage gain
AV
8 DC
 70*  dB
5. Error amplifier ^{Frequency band width}
block [Error Amp]
Output voltage
BW 8 AV = 0 dB
VOH
8

VOL
8

 1.1*  MHz
1.17 1.27 1.37 V
 40 200 mV
Output source current
ISOURCE 8 FB = 0.5 V
 −80 −50 µA
Output sink current
ISINK
8 FB = 0.5 V
100 300  µA
6. PWM compar-
ator block
Maximum duty cycle
[PWM Comp.]
Dtr 5 RT = 7.5 kΩ
85 90 95 %
Output source current
ISOURCE
OUT = 0 V,
5 Duty ≤ 5%
(t = 1/fosc×Duty)
 −400*  mA
7.Output block
[Drive]
Output sink current
OUT = 3.3 V,
ISINK
5 Duty ≤ 5%
 400*  mA
(t = 1/fosc×Duty)
Output ON resistor
ROH 5 OUT = −15 mA
ROL
5 OUT = 15 mA
 4.0*  Ω
 3.0 6.0 Ω
Standby current
8. General block
Power supply current
ICCS
3 RT = OPEN
ICC
3 RT = 7.5 kΩ

0
10 µA
 1.2 1.8 mA
*: Standard design value.
6