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PDF MB3886 Data sheet ( Hoja de datos )
| Número de pieza | MB3886 | |
| Descripción | 2-Channel DC/DC Converter IC | |
| Fabricantes | Fujitsu Media Devices | |
| Logotipo |  |
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27228-2E
ASSP
For Power Supply Applications (General Purpose DC/DC Converter)
2-Channel DC/DC Converter IC
with Overcurrent Protection Symmetrical-Phase Type
MB3886
s DESCRIPTION
The MB3886 is a symmetrical-phase type of two-channel, DC/DC converter IC using pulse width modulation
(PWM) , incorporating an overcurrent protection circuit (requiring no current sense resistor) and an overvoltage
protection circuit. Providing high output driving capabilities, the MB3886 is suitable for down-conversion.
The MB3886 adopts both synchronous rectification to provide high efficiency and symmetrical phasing (two anti-
phase triangular waves) which contributes to making the input capacitor small.
The MB3886 contains a 5-volt regulator resulting in a reduced number of components used. It also contains a
variety of protection features which output the protection status upon detection of an overvoltage or overcurrent
while reducing the number of external protective devices required.
The result is an ideal built-in power supply for driving products with high speed CPU’s such as home TV game
devices and notebook PC’s.
This product is covered by US Patent Number 6,147,477.
s FEATURES
• Overcurrent protection circuit (requiring no current sense resistor) and overvoltage protection circuit
• Power-supply voltage range : 5.5 V to 18 V
• Synchronous rectification system providing high efficiency
• PSIG pins (open-drain) to output the protection status
s PACKAGE
(Continued)
30-pin plastic SSOP
(FPT-30P-M02)
1 page  
MB3886
s ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Conditions
Rating
Min Max
Unit
Power-supply voltage
VCC
20 V
Boot voltage
VCB CB terminal
25 V
Output current IO 120 mA
Peak output current
IOP
Duty ≤ 5%
(t = 1 / fOSC × Duty)
800 mA
Power dissipation
PD Ta ≤ +25 °C
770*
mW
Storage temperature
Tstg
−55 +125
°C
* : The packages are mounted on the dual-sided epoxy board (10 cm × 10 cm) .
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
5
5 Page 
MB3886
(Continued)
Triangular Waveform Oscillation Frequency
vs.
Supply Voltage
320
315 Ta = +25 °C
310 RT = 9.1 kΩ
305 CT = 330 pF
300
295
290
285
280
275
270
265
260
0
5 10 15 20
Supply voltage VCC (V)
Error Amp. Gain/Phase vs. Frequency (CH1)
Ta = +25 °C
40 180
30 Av
20 ϕ
90
10
00
−10
−20 −90
−30
−40 −180
100 1 k 10 k 100 k 1 M 10 M
Frequency f (Hz)
Triangular Waveform Oscillation Frequency
vs.
Ambient Temperature
2
VCC = 12 V
1.5 RT = 9.1 kΩ
CT = 330 pF
1
0.5
0
−0.5
−1
−1.5
−2
−40 −20
0
20 40 60 80 100
Ambient Temperature Ta ( °C)
VCC = 12 V
4.7 kΩ
+ 2.4 kΩ (23)
IN 8
10 µF
7
4.7 kΩ
(24)
240 kΩ
−
+
+
9
(22) OUT
Error Amp.1
(Error Amp.2)
Error Amp. Threshold Voltage
vs.
Ambient Temperature (CH1)
1.264
1.262
1.26
1.258
1.256
1.254
1.252
1.25
1.248
1.246
1.244
1.242
1.24
1.238
1.236
−40
−20
0
VCC = 12 V
20 40 60 80 100
Ambient Temperature Ta ( °C)
Power Dissipation vs. Ambient Temperature
800
770
700
600
500
400
300
200
100
0
−40
−20 0 20 40 60 80
Ambient Temperature Ta ( °C)
100
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MB3886.PDF ] | |
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