bp5233a33 ROHM Co. Ltd., bp5233a33 Datasheet - Page 6

• Manufacturer Part Number: bp5233a33
• Description: Dc/dc Converter
• Manufacturer: ROHM Co. Ltd.

(1) The output current should be reduced according to an increase in the input voltage or ambient
(2) In case that the output is controlled by switching on and off utilizing pin 7 or in case that the input voltage
(3) Protection circuit for output current is incorporated. In case that the output is short-circuited, the output will be
(4) The rising time of the input voltage should be made within 5ms. There may be a case that the protection
(5) I / O smoothing capacitors should be connected between I / O and GND terminals.
(6) Normally, use by short-circuiting pins 1, 2, 3, pins 4, 5, 6, and pins 9, 10, 11 (BP5232A25) respectively.
(7) A large ripple current flows to the input smoothing capacitor due to the output load. Be minded to use
(8) The capacitor with a particularly low impedance is used as the output smoothing capacitor C2 so as to
BP5232A25
BP5232A33
Operation notes
Electrical characteristics
temperature. Use the module within the derating curve range.
is applied, a large inrush electrical current may flow. Be minded to use within the allowable operating range.
This allowable operating range is specified by the safety operating range of the switching transistor in the
module. The amount of the inrush current varies depending on the output impedance of the input power
supply or the capacity value of the capacitor to be connected to the output.
latched by switching off. The protection circuit can be canceled by making CTL terminal active state (CTL=
HIGH), after once making it standby state (CTL=LOW), or by resupplying the power. However, in case that the
protection circuit is canceled by resupplying the power source, it may not be canceled even by resupplying
the power source in the state that the electrical charge is remained in CIN (the state that voltage is remained
in VIN) even after the power source is switched off.
circuit is activated.
within the allowable ripple current of the capacitor.
suppress the output ripple voltage. Select the capacitor according to the purpose of use in each case.
5
4
3
2
1
0
5
4
3
2
1
0
AMBIENT TEMPERATURE : Ta (°C)
AMBIENT TEMPERATURE : Ta (°C)
Fig.6 Derating curve
Fig.9 Derating curve
50
50
100
100
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
V
Fig.10 Conversion efficiency
IN
Fig.7 Conversion efficiency
=4.0V
V
OUTPUT CURRENT : I
0.5
0.5
IN
OUTPUT CURRENT : I
=5.0V
V
IN
=4.0V
V
V
IN=
IN
6.0V
=5.0V
1.0
1.0
V
IN
=6.0V
O
1.5
1.5
O
(A)
(A)
2.0
2.0
100
100
10
10
1
1
0.1
0.1
T
Single Pulse
T
Single Pulse
C
C
=25˚C
=25˚C
Fig.11 Safe operation range
VOLTAGE BETWEEN INPUT PIN
VOLTAGE BETWEEN INPUT PIN
Fig.8 Safe operation range
TO OUTPUT PIN (V)
TO OUTPUT PIN (V)
P
P
W
W
=100µs
=100µs
1
1
P
P
W
W
Rev.C
=10ms
=10ms
10
10
6/7