MB3782 Fujitsu Media Devices, MB3782 Datasheet

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MB3782

Manufacturer Part Number
MB3782
Description
Switching Regulator Controller
Manufacturer
Fujitsu Media Devices
Datasheet

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DataSheet4U.com
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DataSheet
FUJITSU SEMICONDUCTOR
4
ASSP Power Supplies
BIPOLAR
Switching Regulator Controller
MB3782
U
.com
DESCRIPTION
FEATURES
• Wide voltage range (3.6 to 18 V)
• Low power dissipation (operating mode: 2.1 mA (typ), standby mode: 10 A (max)
• Wide range of oscillator frequencies, high-frequency capability (1 to 500 kHz)
• On-chip timer-latch type short detection circuit
• On-chip undervoltage lockout circuit
• On-chip 2.50 V reference voltage circuit (1.25 V output available at R
• Dead time adjustment over full duty cycle range
• On-chip standby mode (power on/off function)
PACKAGE
The FUJITSU MB3782 is a PWM-type switching regulator controller, designed with open-collector output for
connection to external drive transistors and coils, providing a selection of three types of output voltage: step-
up, step-down or inverting (inverting output is available on one circuit only).
The MB3782 features identical oscillator output waveforms to enable completely synchronous operation and
prevent the occurrence of low-frequency beat between channels.
Also, the MB3782 features low power dissipation (2.1 mA typ) and a built-in standby mode (10 A), making
possible the configuration of a wide variety of high-efficiency, stable power supplies, even with the use of battery
power. The MB3782 is an ideal power supply for high-performance portable devices such as video camcorders
and cameras.
DATA SHEET
Plastic DIP , 20 pin
(DIP-20P-M01)
DataSheet4U.com
Plastic SOP , 20 pin
T
(FPT-20P-M01)
pin)
DS04-27205-4E
(Continued)

Related parts for MB3782

MB3782 Summary of contents

Page 1

... The MB3782 features identical oscillator output waveforms to enable completely synchronous operation and prevent the occurrence of low-frequency beat between channels. Also, the MB3782 features low power dissipation (2.1 mA typ) and a built-in standby mode (10 A), making possible the configuration of a wide variety of high-efficiency, stable power supplies, even with the use of battery power ...

Page 2

... MB3782 PIN ASSIGNMENT PIN DESCRIPTION Pin No. Pin Name +IN1 5 –IN1 6 FB1 7 DTC1* DataSheet4U.com 2 4 DataSheet U .com TOP VIEW REF IN1 4 17 – IN1 5 16 FB1 6 15 DTC1 7 14 PUT1 8 13 GND 9 12 ...

Page 3

... Power supply control pin: low level places the IC in standby I mode and reduces power consumption lower. Input level may be driven by TTL or CMOS. — Power supply pin: voltage range is 3 MB3782 Description voltage is divided by an REF Setting voltage is divided by an REF ...

Page 4

... MB3782 BLOCK DIAGRAM + IN1 – IN1 FB1 DTC1 – IN2 FB2 DTC2 – IN3 FB3 DTC3 SCP DataSheet4U.com 4 4 DataSheet U .com REF 1.25 V 2.5 V Reference Triangular wave voltage oscillator source Error Amp.1 PWM Comp – 5 – Error Amp.2 PWM Comp. – ...

Page 5

... DataSheet4U.com 4 DataSheet U .com pin. T /2) or the voltage obtained from the R REF /2 voltage. REF DataSheet4U.com ( 0.65 V)), the latch circuit will operate to turn the output transistor BE MB3782 pin (pin 1). REF pin (pin 2) and R pin (pin 3), the oscillator T T pin (1.25 V). The non-inverting input for the T 5 ...

Page 6

... MB3782 It is also possible to use the DTC terminal to provide a soft start function. 7. Output Transistor The output is open-collector type, with the emitter of the output transistor connected to the GND pin. The power transistor for external switching can carry a base current mA. ...

Page 7

... SCP pin (pin 14) is held “low.” This closes the S-R latch input and then discharges the capacitor C S.C.P.Comp. – Error Amp.1 – Error Amp.2 – Error Amp.3 + 2.1 V DataSheet4U.com 4 DataSheet U .com 10 – – DataSheet4U.com Latch Figure 1 Protection Latch Circuit MB3782 2.50 V PWM Comp. R U.V.L.O. Out 7 ...

Page 8

... MB3782 SETTING OUTPUT VOLTAGE The following diagrams show the connections used to set the output voltage. Because the power supply to the error amps is provided by the same reference voltage circuit used for the other internal circuits, the common-mode input voltage range is set at 1. 1.45 V. ...

Page 9

... The non-inverting input to the error amps on channel 2 and channel 3 is internally connected to V therefore cannot be configured for inverting output. Step up Step down Inverting DataSheet4U.com 4 DataSheet U .com – 1.25 V Figure 3 Error amp (channel 2, channel 3) connection DataSheet4U.com ch-1 ch-2 MB3782 1.25 = · ( pin 12,17 ch-3 /2, and REF 9 ...

Page 10

... MB3782 USING THE R PIN T The triangular waves, as shown in Figure 1, act to set the oscillator frequency by charging and discharging the capacitor connected to the C In addition, when voltage level V the external circuit connections to adjust for the fact that I external circuits in determining the oscillator frequency (see Figure 2). ...

Page 11

... IN1 4 – IN1 5 7 DTC1 GND 9 Note: Pin 6 and pin 8 shoud be left open. DataSheet4U.com V 1 REF – IN2 13 GND 9 DTC2 11 Note: Pin 10 and pin 12 shoud be left open REF – IN3 18 DTC3 16 GND 9 Note: Pin 15 and pin 17 shoud be left open. MB3782 11 ...

Page 12

... MB3782 TREATMENT OF UNUSED SCP PIN When the timer latch short protection circuit is not used, the SCP pin should be connected to the GND by the shortest possible path. ABSOLUTE MAXIMUM RATINGS Parameter Power supply voltage Error amp input voltage Dead time control input voltage ...

Page 13

... CTL V — — OUT I — 0.3 OUT I — –3 REF C — 150 T R — 5 — 1 OSC Top — –30 DataSheet4U.com MB3782 Value Unit Typical Max. 6.0 18.0 V — 1.45 V — — — – — 15000 pF — 100 k — 500 ...

Page 14

... MB3782 ELECTRICAL CHARACTERISTICS Parameter Output voltage Output voltage temperature variation Input stability Load stability Short output current Threshold voltage Hysteresis width Reset voltage (V Input threshold voltage Input standby voltage Input latch voltage Input source current Comparator threshold voltage Oscillator frequency ...

Page 15

... V CTL CTL Leak OUT SAT OUT CCS CTL output load CCa CTL CC pin. T MB3782 ( + Value Unit Min. Typ. Max. –6 — –100 — 100 nA –500 –100 — nA 1.05 — 1. — ...

Page 16

... MB3782 TEST CIRCUIT 330 pF 150 k TEST INPUT DataSheet4U.com 16 4 DataSheet U .com OUTPUT OUTPUT 4 CTL TEST 5 16 INPUT TEST DataSheet4U.com 10 11 INPUT V CC 4.7 k OUTPUT ...

Page 17

... TIMING CHART (INTERMAL WAVEFORMS) DataSheet4U.com 4 DataSheet U .com DataSheet4U.com MB3782 17 ...

Page 18

... MB3782 EXAMPLE OF APPLICATION DataSheet4U.com 18 4 DataSheet U .com DataSheet4U.com ...

Page 19

... +25°C Frequency vs.error amp maximum output voltage amplitude 3.0 2.0 1.0 0 100 500 (mA) OL MB3782 Power supply voltage vs.average feed current Ta = +25° Power supply voltage V ( +25° ...

Page 20

... MB3782 Timing resistance vs.oscillator frequency 1 M 100 15000 Timing resistance R Ambient temperature vs.oscillator frequency 10 0 – 10 – 40 – Ambient temperature Ta (°C) Control voltage vs.reference voltage 5.0 2 DataSheet4U.com 20 4 DataSheet U .com +25° ...

Page 21

... M Test Circuit V V REF REF 4.7 k 4.7 k 240 k – – 4.7 k 4.7 k Error amp MB3782 Frequenncy vs.gain and phase C = 0.047 100 100 k Frequenncy f (Hz) Frequenncy vs.gain and phase C = 4700 ...

Page 22

... MB3782 (Continued) DataSheet4U.com 22 4 DataSheet U .com Ambient temperature vs.allowable loss 1200 1110 DIP version 1000 800 740 SOP version 600 400 200 0 – 30 – 20 – Ambient temperature Ta (°C) DataSheet4U.com ...

Page 23

... Frequency f (Hz) DataSheet4U.com 4 DataSheet U .com DataSheet4U.com Basic circuit for step-down voltage DC/DC converter – – 180 100 k Graph 1 Frequency vs. gain and phase MB3782 Frequency vs.phase 100 Frequency f (Hz 100 k 23 ...

Page 24

... MB3782 • Reference data Changing the smoothing capacitor from an aluminum electrolytic capacitor (RC semiconductor electrolytic capacitor (OS capacitor: RC 1-3). FB Figure 2 DC/DC converter + 5 V output frequency vs.gain and phase Graph – 20 – Graph 3 DC/DC converter + 5 V output frequency vs.gain and phase 60 40 ...

Page 25

... ORDERING INFORMATION Part number MB3782P MB3782PF DataSheet4U.com 4 DataSheet U .com Package Plastic DIP, 20 pin (DIP-20P-M01) Plastic SOP, 20 pin (FPT-20P-M01) DataSheet4U.com MB3782 Remarks 25 ...

Page 26

... MB3782 PACKAGE DIMENSIONS Plastic DIP , 20 pin (DIP-20P-M01) INDEX-1 INDEX-2 4.36(.172)MAX 3.00(.118)MIN 0.86 .034 1.27(.050) MAX 1994 FUJITSU LIMITED D20005S-3C-3 C DataSheet4U.com 26 4 DataSheet U .com +0.20 24.64 –0.30 +.008 .970 –.012 +0.30 +0.30 1.27 –0 –0 +.012 +.012 .050 –0 –0 2.54(.100) TYP DataSheet4U.com 6.60±0.25 (.260±.010) 0.51(.020)MIN 0.25± ...

Page 27

... DataSheet U .com +0.25 +.010 12.70 .500 –0.20 –.008 5.30±0.30 (.209±.012) 0.45±0.10 Ø0.13(.005) M (.018±.004) 0.10(.004) DataSheet4U.com 11.43(.450)REF MB3782 2.25(.089)MAX 0.05(.002)MIN (STAND OFF) +0.40 6.80 7.80±0.40 –0.20 (.307±.016) +.016 .268 –.008 +0.05 0.15 0.50±0.20 –0.02 +.002 (.020±.008) .006 – ...

Page 28

... MB3782 FUJITSU LIMITED For further information please contact: Japan FUJITSU LIMITED Corporate Global Business Support Division Electronic Devices KAWASAKI PLANT, 4-1-1, Kamikodanaka Nakahara-ku, Kawasaki-shi Kanagawa 211-8588, Japan Tel: (044) 754-3763 Fax: (044) 754-3329 http://www.fujitsu.co.jp/ North and South America FUJITSU MICROELECTRONICS, INC. ...

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