MB3883_02

Manufacturer Part NumberMB3883_02
Description6-ch DC/DC Converter IC with Synchronous Rectifier for Voltage Step-up and Step-down
ManufacturerFUJITSU [Fujitsu Component Limited.]
MB3883_02 datasheet
 


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FUJITSU SEMICONDUCTOR
DATA SHEET
ASSP For Power Management Applications
-ch DC/DC Converter IC with Synchronous
6
Rectifier for Voltage Step-up and Step-down
MB3883
DESCRIPTION
The MB3883 is a 6-channel step-up/step-down DC/DC converter IC using pulse width modulation (PWM) and
synchronous rectification, designed for low voltage, high efficiency, and compact size. This IC is ideal for up
conversion, down conversion, and up/down conversion (using a step-up/step-down Zeta system with free input
and output settings).
The MB3883 can operate at low voltage levels, and has a wide supply voltage range from 1.7 V to 9 V.
The MB3883 is available in two packages, an LQFP-48P or a leadless BCC-48P formed with a contact electrode
pad only.
This is an ideal power supply for high-performance portable devices such as digital still cameras.
This product is covered by US Patent Number 6,147,477.
FEATURES
• Supports synchronous rectification (CH1, 2, 5)
• Supports for down-conversion and up/down Zeta conversion (CH1, 2)
Supports for up-conversion (CH5)
• Supports up-conversion (CH3, 4, 6)
• Low start-up voltage : 1.7 V (CH6)
PACKAGES
48-pin plastic LQFP
(FPT-48P-M05)
DS04-27225-4E
(Continued)
48-pad plastic BCC
(LCC-48P-M02)

MB3883_02 Summary of contents

  • Page 1

    FUJITSU SEMICONDUCTOR DATA SHEET ASSP For Power Management Applications -ch DC/DC Converter IC with Synchronous 6 Rectifier for Voltage Step-up and Step-down MB3883 DESCRIPTION The MB3883 is a 6-channel step-up/step-down DC/DC converter IC using pulse width modulation (PWM) and synchronous ...

  • Page 2

    MB3883 (Continued) • Power supply voltage range • Built-in high-precision reference voltage circuit : 1 • Wide operating oscillator frequency range with high-frequency capability : 100 kHz to 1 MHz • Error amplifier output for soft start (CH1 to CH6) ...

  • Page 3

    PIN ASSIGNMENTS SWOUT 1 SWIN 2 FB6 3 IN6 4 C IN6 5 DTC5 6 FB5 7 IN5 OUT ( FB4 11 IN4 12 (CH4) (TOP VIEW) Output block Control block (FPT-48P-M05) MB3883 ...

  • Page 4

    MB3883 SWOUT 1 SWIN 2 FB6 3 IN6 4 C IN6 5 DTC5 6 FB5 7 IN5 OUT ( FB4 11 IN4 (CH4) 4 (TOP VIEW) Output block ...

  • Page 5

    PIN DESCRIPTION Pin No. Symbol 35 FB1 34 IN1 CH1 36 DTC1 37 OUT1-1 38 OUT1-2 32 FB2 31 IN2 CH2 33 DTC2 39 OUT2-1 40 OUT2-2 29 FB3 28 IN3 CH3 30 DTC3 41 OUT3 11 FB4 12 IN4 ...

  • Page 6

    MB3883 (Continued) Pin No. Symbol 25 RT OSC SWOUT 2 SWIN 20 CTL 21 CTL1 CTL3 Control 23 CTL4 24 CTL5 18 CSCP VCC 42 VCC (O) Power 16 VREF ...

  • Page 7

    BLOCK DIAGRAM FB1 35 IN1 34 DTC1 36 FB2 32 IN2 31 DTC2 33 FB3 29 IN3 28 DTC3 OUT ( FB4 11 IN4 DTC4 14 FB5 7 ...

  • Page 8

    MB3883 • Block diagram (Expansion 1/2) FB1 35 IN1 34 DTC1 36 FB2 32 IN2 31 DTC2 33 FB3 29 IN3 28 DTC3 OUT ( FB4 11 IN4 ...

  • Page 9

    Block diagram (Expansion 2/2) FB5 7 IN5 8 1.25 V 1.0 V DTC5 6 FB6 3 ( IN6 4 37.5 k 62.5 k 1.26 V SCP Comp.6 C IN6 5 0.9 V 1.8 V 1.1 V ...

  • Page 10

    MB3883 ABSOLUTE MAXIMUM RATINGS Parameter Symbol V CC Power supply voltage I O Output current I O Output peak current P D Power dissipation Storage temperature Tstg * : The packages are mounted on the epoxy board (10 cm WARNING: ...

  • Page 11

    RECOMMENDED OPERATING CONDITIONS Parameter Symbol Startup power supply voltage Power supply voltage Reference voltage output current VB pin output current Input voltage Control input voltage Output current Output current setting resister Oscillator frequency Timing capacitor Timing resistor Soft-start capacitor Short ...

  • Page 12

    MB3883 ELECTRICAL CHARACTERISTICS Parameter Symbol Reference V REF voltage Output voltage V temperature /V REF stability Input stability Line Load stability Load Short-circuit I OS output current Threshold V voltage Hysteresis V width Reset voltage V RST Threshold V voltage ...

  • Page 13

    Parameter Symbol Threshold voltage V temperature T stability Input bias current Voltage gain Frequency bandwidth Output voltage Output source current I SOURCE Output sink current Threshold voltage V temperature T stability Input bias current Voltage gain Frequency bandwidth Output voltage ...

  • Page 14

    MB3883 Parameter Threshold voltage Input bias current Threshold voltage Threshold voltage Input current Threshold voltage Maximum duty cycle Output source current Output sink current Output ON resistor Output source current Output sink current Output ON resistor Output source current Output ...

  • Page 15

    Parameter Symbol input voltage V IL Input current I SWIN Output source I SOURCE current Output sink current I SINK R OH Output ON resistor CTL input voltage V IL Input current ...

  • Page 16

    MB3883 TYPICAL CHARACTERISTICS Power supply current vs. power supply voltage CTL CTL1, 2 CTL3 Power supply voltage V Reference voltage vs. ambient temperature 2.56 VCC 5 V CTL ...

  • Page 17

    Triangular wave upper and lower limit voltage vs. triangular wave oscillator frequency 0.9 VCC 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0 200 400 600 800 Triangular wave oscillator ...

  • Page 18

    MB3883 (Continued) Error amplifier gain and phase vs. frequency (CH1 100 k Frequency f (Hz) Error amplifier gain and phase vs. frequency (CH6 ...

  • Page 19

    FUNCTIONS 1. DC-DC Converter Functions (1) Reference voltage block The reference voltage circuit generates a temperature-compensated reference voltage (typically : = 2.49 V) from the voltage supplied from the power supply terminal (pin 19). The voltage is used as the ...

  • Page 20

    MB3883 2. Channel Control Function Channels are turned on and off depending on the voltage levels at the CTL terminal (pin 20), CTL1, 2 terminal (pin 21), CTL3 terminal (pin 22), CTL4 terminal (pin 23), and CTL5 terminal (pin 24). ...

  • Page 21

    Soft Start Operation 1. Description • When the CTL, CTL1,2, CTL3, CTL4, and CTL5 terminals are driven high (“H” level) at the same time The capacitor (C+IN6) connected to the C+IN6 terminal (pin 5) starts charging. When the C+IN6 ...

  • Page 22

    MB3883 • After a CH6 soft start, when the CTL1, 2, CTL3, CTL4, and CTL5 terminals are driven high The capacitor (Cs) connected to the CS terminal (pin 15) starts charging and the error amp provides a soft start by ...

  • Page 23

    Soft Start Settings • CH6 soft start time The soft start operation is determined by the capacitor (C+IN6) connected to the C+IN6 terminal (pin 5). The soft start time depends on the input voltage and load current. CH6 soft ...

  • Page 24

    MB3883 SETTING THE OUTPUT VOLTAGE • CH1 to CH3, CH5 V O FB1 R1 IN1 R2 • CH4 ( OUT ( FB4 R3 12 IN4 Error Amp.1 ...

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    CH6 V O FB6 37.5 k IN6 R2 1. IN6 5 1. Error ( Amp.6 62.5 k MB3883 (R1 R2) 25 ...

  • Page 26

    MB3883 SETTING THE OUTPUT CURRENT The output circuit (drive 6) is structured as illustrated below (in the output circuit diagram). As found in “Output Current Waveform” below, the source current value of the output current waveform has a constant current ...

  • Page 27

    SETTING TIME CONSTANT FOR TIMER-LATCH SHORT-CIRCUIT PROTECTION CIRCUIT The short detection comparator (SCP comparator) in each channel monitors the output voltage. While the switching regulator load conditions are stable on all channels, the LOG_SCP output remains at “H” level, transistor ...

  • Page 28

    MB3883 TREATMENT WITHOUT USING CSCP When not using the timer-latch short protection circuit, connect the CSCP terminal (pin 18) to GND with the shortest distance. OPERATING WITHOUT THE SOFT START FUNCTION To disable the CH1 to CH5 soft start function, ...

  • Page 29

    SETTING THE DEAD TIME When the device is set for step-up inverted output based on the step-up or step-up/down Zeta method or flyback method, the FB pin voltage may reach and exceed the rectangular wave voltage due to load fluctuation. ...

  • Page 30

    MB3883 TREATMENT WITHOUT USING CH4 INV Amp. When not using the CH4 INV Amp., connect the -IN(A)4 terminal (pin 9) to the OUT(A)4 terminal (pin 10) with the shortest distance IN(A)4 OUT(A)4 Treatment without using CH4 INV ...

  • Page 31

    APPLICATION EXAMPLE A FB1 R12 35 C23 2.7 k 0.1 F R13 IN1 R14 15 k R15 DTC1 R16 47 k FB2 B C24 32 0.1 F R17 ...

  • Page 32

    MB3883 • Application example (Expansion1/2) A FB1 R12 35 C23 2.7 k 0.1 F R13 IN1 R14 15 k R15 DTC1 R16 47 k FB2 B C24 32 0.1 F R17 ...

  • Page 33

    Application example (Expansion 2/2) FB5 F R32 7 C27 15 k 0.1 F R33 R10 IN5 R34 15 k R35 DTC5 R36 FB6 3 R37 C28 15 k ...

  • Page 34

    MB3883 PARTS LIST COMPONENT ITEM Q1, Q2 PNP Q6, Q8 FET Q9, Q10, Q12 FET Q7, Q11 NPN Tr D1, D2, D8, D9 Diode Diode L1, L5 Coil Coil C1 to ...

  • Page 35

    REFERENCE DATA Conversion efficiency vs. load current (CH1 : Zeta method with synchronous rectification 3.3 V output VCC VCC( 100 150 200 250 300 ...

  • Page 36

    MB3883 (Continued) Conversion efficiency vs. load current (CH5 : Up conversion method with synchronous rectification) 100 Vin = 2.5 V Vin = Vin = 3.6 V Vin = 4.2 ...

  • Page 37

    USAGE PRECAUTION • Printed circuit board ground lines should be set up with consideration for common impedance. • Take appropriate static electricity measures. • Containers for semiconductor materials should have anti-static protection or be made of conductive material. • After ...

  • Page 38

    MB3883 PACKAGE DIMENSIONS 48-pin plastic LQFP (FPT-48P-M05) 9.00 ± 0.20(.354 ± .008)SQ +0.40 +.016 *7.00 (.276 )SQ –0.10 –.004 36 37 INDEX 48 LEAD No. 1 0.50(.020) 2002 FUJITSU LIMITED F48013S-c-5 Note These dimensions include ...

  • Page 39

    BCC (LCC-48P-M02) 7.00±0.10(.276±.004) 37 (.276±.004) INDEX AREA 1 0.05(.002) 2001 FUJITSU LIMITED C48055S-c-4-2 C 6.20(.244)TYP 5.00(.197)REF (0.80(.031)MAX) 0.50(.020) (Mount height) 25 TYP 25 6.20(.244) 7.00±0.10 TYP 13 "C" "A" 13 0.075±0.025 6.15(.242)REF (.003±.001) (Stand off) Details of ...

  • Page 40

    MB3883 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 and circuit diagrams in this document are presented as examples ...