MB3775 Fujitsu, MB3775 Datasheet

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MB3775

Manufacturer Part Number
MB3775
Description
Manufacturer
Fujitsu
Datasheet

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FUJITSU SEMICONDUCTOR
ASSP
SWITCHING REGULATOR
CONTROLLER
MB3775
This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields.
However, it is advised that normal precautions be taken to avoid application of any voltage higher than maximum
rated voltages to this high impedance circuit.
LOW VOLTAGE DUAL PWM SWITCHING REGULATOR CONTROLLER
The MB3775 is a dual pulse-width-modulation control circuit. It contains the basic circuits required for two PWM
control circuits. Complete synchronization is obtained by using the same oscillator output waveform.
This IC can provide following types of output voltage: step down, step up, and inverter. Power consumption is low,
thus the MB3775 is ideal for use in high-efficiency portable equipment.
FEATURES
• Wide supply voltage range: 3.6 V to 18 V
• Low current consumption: 1.3 mA typical
• Wide oscillation frequency range: 1 kHz to 500 kHz
• On-chip timer latch short protection circuit
• On-chip under voltage lockout protection
• On-chip reference voltage: 1.28 V
• Variable dead time provides control over total operating range.
PACKAGES
DATA SHEET
16-pin plastic DIP
(DIP-16P-M04)
16-pin plastic SSOP
(FPT-16P-M05)
16-pin plastic SOP
(FPT-16P-M06)
DS04-27204-4E

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MB3775 Summary of contents

Page 1

... MB3775 LOW VOLTAGE DUAL PWM SWITCHING REGULATOR CONTROLLER The MB3775 is a dual pulse-width-modulation control circuit. It contains the basic circuits required for two PWM control circuits. Complete synchronization is obtained by using the same oscillator output waveform. This IC can provide following types of output voltage: step down, step up, and inverter. Power consumption is low, thus the MB3775 is ideal for use in high-efficiency portable equipment ...

Page 2

... MB3775 PIN ASSIGNMENT BLOCK DIAGRAM 1.28 V REF Reference 16 Voltage Error Amp 1 Error Amp (TOP VIEW REF SCP T +IN1 3 14 +IN2 - - IN1 4 13 IN2 FB1 5 12 FB2 D.T.C D.T.C.2 OUT1 7 10 OUT2 E/GND ...

Page 3

... Output drive transistor The open-collector output-drive transistors provide common-emitter output dielectric capability. The output drive transistors can source drive current to the switching power transistor. terminal 0.65 V), the latch circuit turns the output drive transistor off BE MB3775 T REF 3 ...

Page 4

... MB3775 ABSOLUTE MAXIMUM RATING Parameter Power Supply Voltage Error Amp. Input Voltage Collector Output Voltage Collector Output Current Power Dissipation Operating Temperature Storage temperature *: The packages are mounted on the epoxy board ( 1.5 mm). WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc ...

Page 5

... 3 + Duty Cycle = Duty Cycle = 100 % V t100 I bdt Idt = 40 A Vdt MB3775 ( Value Unit Min Typ Max 1.26 1.28 1. ±0 – – 1 7.5 mV – – – 30 ...

Page 6

... MB3775 (Continued) Parameter Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Range Voltage Gain Error Amp. Frequency Band Width Section Common Mode Rejection Ratio Max Output Voltage Width Output Sink Current Output Source Current Input Threshold Voltage ...

Page 7

... LOCK-OUT CANCEL Power supply voltage 3 Min Value) 2.8 V (Typ Value INPUT CC TEST 4 MB3775 TEST INPUT Protection Enable Time t MB3775 OUTPUT 1 OUTPUT 2 DEAD TIME 100 0 ( ...

Page 8

... V 8 Fig Chopper Type Step Down/Inverting MB3775 120 H + 220 F Fig Chopper Type Step Up/Inverting MB3775 3.9 k 120 H + 220 ( 0 1 220 F 5.6 k 470 470 ...

Page 9

... 220 220 F 220 F GND (+ MB3775 0 1 220 150 120 H + 220 F GND + 5 1.8 k 220 220 ...

Page 10

... MB3775 HOW TO SET OUTPUT VOLTAGE The output voltage is set using the connection shown in Fig. 5 and 6. The error amplifiers are supplied to the internal reference voltage circuit as are the other internal circuits. The common-mode input voltage range is from 0 +1.45 V. When the amplifiers are operated non-inverting, tie the inverting terminal to V are operated inverting, tie the non-inverting terminal to ground ...

Page 11

... Q S.C.P.Comp Error Amp.1 + Error Amp 1.1 V off. The protection enable terminal voltage until the D.T.C. terminal voltage drops to about 0 Fig Protection Latch Circuit Latch + + D.T.C.Comp. 1.8 V MB3775 2 U.V.L.O. 0.9 V D.T.C.1 6 0.9 V D.T.C ...

Page 12

... MB3775 SYNCHRONIZATION OF ICs To synchronize MB3775 ICs, first, the specified capacitor and resistor are connected to the C of the master IC to start self oscillation. Next applied to the R charge/discharge circuit for triangular wave oscillation. Finally, the C connected. Instead of applying V to the the dashed line in Fig. 8). Select the pull-up resistance R ...

Page 13

... O age Fig Power supply voltage vs. Average supply current 2.0 1.5 1.0 0 (V) Power supply voltage V Fig Reference voltage vs. Temp. 1.29 1.28 1.27 1.26 1. (V) Fig Error Amp. Max output voltage vs. Frequency 3.0 2.0 1.0 0 350 100 MB3775 ( Temp 10k 100k 1M Frequency f (Hz) (Continued) 13 ...

Page 14

... MB3775 Fig Timing resistor vs. Oscillation Frequency 1M 100k 10k 1k 100 1k 10k 100k Timing resistor R Fig Timing capacitor vs. Triangular waveform Max Amplitude voltage 2.2 Timing resistance= 2.0 1.8 1.6 1.4 1.2 1 Timing capacitor C Fig Frequency vs. Gain/Phase (Actual Data ...

Page 15

... Fig Frequency vs. Gain/Phase (Actual Data =0. Gain Phase Frequency f (Hz) MB3775 180 180 7 15 ...

Page 16

... MB3775 APPLICATION 1. How to set the error amplifier frequency characteristic Figure 22 shows the equivalent circuit of the error amplifier. The frequency characteristic of the error amplifier is set by R ratio of resistors R and R in the IC (set value 1 2 When C = 0.1 F, the gain at 20 kHz P external phase compensating capacitor C ...

Page 17

... Frequency f (Hz) Fig Error Amp. Frequency characteristics (Large 100 1k 10k 100k Frequency f (Hz) MB3775 180 0 180 1M 10M 100M 180 90 (Large 180 1M 10M 100M 17 ...

Page 18

... MB3775 Fig Ceramic Chip Capacitor (0.1 F) Temp. characteristic Temp. : Ratio 10k 100k Frequency f (Hz) Fig Tantal Capacitor (0.33 F) Temp. characteristic Temp. : Ratio 0. 0. ...

Page 19

... Fig Step Down DC/DC Converter Basic Circuit Fig Gain vs. Frequency ( ( 100 1k Frequency f (Hz Fig Phase vs. Frequency (2) 180 (1) 10k 100k 10 100 MB3775 (2) (1) 1k 10k 100k Frequency f (Hz) 19 ...

Page 20

... MB3775 Reference data If an aluminum electrolytic smoothing capacitor (R lytic capacitor (OS-CON 0.1 F Fig DC/DC Converter +5 V output 100 Frequency f (Hz) Fig DC/DC Converter +5 V output 100 Frequency f (Hz replaced with a low ESR semiconductor electro ...

Page 21

... To solve this problem, phase compensation can be used. This method increases the phase margin by advancing the phase when the phase margin is reduced by a low ESR capacitor. The three suggestions listed below are recommended for DC/DC converters using the MB3775. (1) As shown in Fig. 35, a capacitor is connected in parallel with the output feedback resistor to advance the phase ...

Page 22

... MB3775 (2) As shown in Figure 37, a resistor (R advance the phase. The more R high-frequency range is also increased, which causes instability. Therefore, select the optimum resistance (see Fig. 38). Fig External circuit example 2 to advance the phase 0 Smoothing Capacitor ...

Page 23

... V 0 Advanced phase compensation R 4 capacitor [+ IN REF REF is connected to the error amplifier as shown P Fig Error Amp. /Boost Equivalent circuit 120 [FB] MB3775 Boost circuit Error Amp. R 470 ...

Page 24

... The worker must put on a grounding device containing 250 k • Do not apply a negative voltage - Applying a negative voltage of 0 less to an LSI may generate a parasitic transistor, resulting in malfunction. ORDERING INFORMATION Part number MB3775P MB3775PF MB3775PFV resistors in series. Package 16-pin plastic DIP (DIP-16P-M04) 16-pin plastic SOP (FPT-16P-M06) ...

Page 25

... MAX TYP 1994 FUJITSU LIMITED D16033S-2C-3 C +0.20 –0.30 6.20±0.25 (.244±.010) 0.51(.020)MIN 0.25±0.05 (.010±.002) 0.46±0.08 (.018±.003) +0.30 1.52 –0 +.012 .060 –0 Dimensions in mm (inches) Note : The values in parentheses are reference values. MB3775 15°MAX 7.62(.300) TYP (Continued) 25 ...

Page 26

... MB3775 16-pin Plastic SOP (FPT-16P-M06) +0.25 +.010 * 1 10.15 .400 –0.20 –.008 16 INDEX 1 1.27(.050) 0.47±0.08 (.019±.003) 0.10(.004) 0.10(.004) 2002 FUJITSU LIMITED F16015S-c-4 Note Resin protrusion. (Each side : +0.15 (.006) Max). Note These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. ...

Page 27

... Details of "A" part "A" 0.13(.005) M 0.50±0.20 (.020±.008) 0.60±0.15 (.024±.006) Dimensions in mm (inches) Note : The values in parentheses are reference values. MB3775 +0.20 1.25 –0.10 (Mounting height) +.008 .049 –.004 0~8 ˚ 0.10±0.10 (Stand off) (.004±.004) ...

Page 28

... MB3775 FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of Fujitsu semiconductor device ...

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