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