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PDF MB3785A Data sheet ( Hoja de datos )
| Número de pieza | MB3785A | |
| Descripción | Switching Regulator Controller | |
| Fabricantes | Fujitsu Media Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MB3785A (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27208-1E
ASSP
BIPOLAR
Switching Regulator Controller
(4 Channels plus High-Precision, High-Frequency Capabilities)
MB3785A
s DESCRIPTION
The MB3785A is a PWM-based 4-channel switching regulator controller featuring high-precision, high-frequency
capabilities. All of the four channels of circuits allow their outputs to be set in three modes: step-down, step-up, and
inverted. The third and fourth channels are suited for DC motor speed control.
The triangular-wave oscillation circuit accepts a ceramic resonator, in addition to the standard method of oscillation
using an RC network.
DataShee
s FEATURES
DataSheet4U.com
• Wide range of operating power supply voltages: 4.5 V to 18 V
• Low current consumption: 6 mA [TYP] when operating10 µA or less during standby
• Built-in high-precision reference voltage generator: 2.50 V±1%
• Oscillation circuit
- Capable of high-frequency oscillation: 100 kHz to 1 MHz
- Also accepts a ceramic resonator.
• Wide input range of error amplifier: –0.2 V to VCC–1.8 V
• Built-in timer/latch-actuated short-circuiting detection circuit
(Continued)
s PACKAGE
48-pin, Plastic LQFP
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DataSheet4 U .com
(FPT-48P-M05)
1 page  
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MB3785A
s BLOCK DIAGRAM
et4U.com
+IN1 (E) 7
–IN1 (E) 6
FB1 5
–IN1 (C) 8
DTC1 4
CH 1
Error Amp 1
+
–+
VREF
+
Comparator 1
DTC
–
2V
– Comparator 1
–
–
+
VREF
PWM comparator 1
OFF Current
Setting
2.5 V
+IN2 (E) 12
–IN2 (E) 11
FB2 10
–IN2 (C) 13
DTC2 9
CH 2
Error Amp 2
+
–
VREF Comparator 2
+
–
+
–
DTC 2 V
Comparator 2
–
–
+
VREF
PWM comparator 2
OFF Current
Setting
2.5 V
+IN3 (E) 25
–IN3 (E) 26
FB3 27
–IN3 (C) 24
DTC3 28
CH 3
Error Amp 3
+
–
Comparator 3
+
0.6 V
–
PWM comparator 3
+
DataSheet4+U.com
–
100 Ω
OFF Current
Setting
2.5 V
CH 4
Error Amp 4
+IN4 (E) 30
+
–IN4 (E) 31
FB4 32
–IN4 (C) 29
–
Comparator 4
+
0.6 V
–
DTC4 33
SCP
Comparator
––––+
2.1 V
SCP
23
1 µA
PWM comparator 4
+
+
–
100 Ω
OFF Current
Setting
2.5 V
–
–
DTC +
Comparator 3
VREF
1.2 V
–1.9 V
–1.3 V
SR
SR Latch
Under Voltage
Lock-out
Protection Circuit
Triangular-Wave
Oscillator Circuit
Ref. Power Supply
Vol. Circuit & Channel
Circuit
Control
14
OSCIN
15 16
2.5 V
17 19
RT CT
VREF
42
GND
Ca1
1
48 Cb1
45 VCC2
46 OUT1
47
VE1
3
2 Ca2
Cb2
44 OUT2
43
VE2
34
33 Ca3
Cb3
40 OUT3
41
VE3
Ca4
36
37
Cb4
39 OUT4
38
VE4
21 CTL2
22 CTL3
18 VCC1
20 CTL1
OSCOUT
Ceramic Resonator
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DataSheet4 U .com
DataShee
5
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MB3785A
s TYPICAL CHARACTERISTIC CURVES
1. Supply current vs. Supply voltage
2. Reference voltage vs. Supply voltage
10 Ta = +25°C
8 CTL1 = 6 V
6
CTL1, 2 = 6 V,
4 CTL1, 2, 3 = 6 V
2
5
4
3
2
1
Ta = +25°C
et4U.com
0
0 4 8 12 16 20
0
04
8 12 16 20
Supply voltage VCC (V)
Supply voltage VCC (V)
3. Reference voltage and Output current setting
pin voltage vs. Supply voltage
4. Reference voltage vs. Ambient temperature
2.56
5 Ta = +25°C 5
VCC = 6 V
2.54
VCTL1, 2,3 = 6 V
IOR = –1 mA
44
VREF DataSheet4U.2c.o52m
33
2.50
2
VE 2
2.48
1 1 2.46
0 12
34
5
Supply voltage VCC (V)
5. Reference voltage vs. Control voltage
2.44
–60 –40 –20 0 20 40 60 80 100
Ambient temperature Ta (°C)
6. Control current vs. Control voltage
DataShee
3.0
2.8
2.6
2.4
2.2
2.0
0
DataSheet4U.com
VCC = 6 V
Ta = +25°C
1234
Control voltage VCTL1 (V)
5
DataSheet4 U .com
500
400
300
200
100
0
0
VCC = 6 V
Ta = +25°C
4 8 12 16
Control voltage VCTL1 (V)
20
(Continued)
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet MB3785A.PDF ] | |
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