BD9329AEFJ Datasheet, PDF (6/16 Pages) Rohm – Simple Step-down Switching Regulator with Built-in Power MOSFET

BD9329AEFJ
Technical Note
●Typical Performance Characteristics (Unless otherwise specified, VIN= 12V Ta = 25℃)
1.6
1.4
1.2
1
0.8
0.6
0.4
3
6
9
12
15
18
VIN (V)
Fig.4 Circuit Current
(No switching)
32
28
24
20
16
12
8
4
0
4 6 8 10 12 14 16 18
VIN (V)
Fig.5 Stand by current
(IC not active)
0.01
0.005
0
-0.005
-0.01
0
0.4 0.8 1.2 1.6 2 2.4
VFB (V)
Fig.6 Input Bias Current
0.92
0.91
0.90
0.89
0.88
-40 -20 0 20 40 60 80
TEMP[℃]
Fig.7 Feedback voltage
0.26
0.22
0.18
0.14
0.1
-40 -20 0 20 40 60 80
TEMP [°C]
Fig.8 Hi,Low-Side
On-resistance
370
365
360
355
350
345
340
-40 -20 0
20 40 60 80
TEMP (°C)
Fig.9 Operating Frequency
95
90
85
80
75
70
65
60
55
50
0 500 1000 1500 2000 2500 3000
Io[mA]
Fig.10 STEP Down Efficiency
(VIN= 12V VOUT= 3.3V L=10µH)
Vout
SS
SW
Iout
Fig.11 OverCurrent Protection
(VOUT is shorted to GND)
1000
100
10
1
0.01
0.1
1
Css[uF]
Fig.12 Soft Start Time
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6/15
2011.02 - Rev.A