Fujitsu MB3887 Datasheet
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Fujitsu MB3887, MB3887 14 (Continued) − + 7 8 9 + OUT IN (5) (4) (3) 240 kΩ 2.4 kΩ 10 kΩ 10 kΩ10 kΩ 10 kΩ Error Amp1 (Error Amp2) 4.2 V VCC = 19 V 1 µF Ta = +25 °C AV φ 40 20 0 −20 −40 180 90 0 −90 −180 1 k 10 k 100 k 1 M 10 M − + + 15 16 22 + OUT IN 240 kΩ 2.4 kΩ 10 kΩ 10 kΩ10 kΩ 10 kΩ Error Amp3 4.2 V 4.2 V VCC = 19 V 1 µF Ta = +25 °C A V φ 40 20 0 −20 −40 180 90 0 −90 −180 1 k 10 k 100 k 1 M 10 M Ta = +25 °C A V φ 40 20 0 −20 −40 180 90 0 −90 −180 1 k 10 k
Fujitsu MB3887, MB3887 19 ■ METHOD OF SETTING THE SOFT-START TIME For preventing rush current upon activation of IC, the IC allows soft-start using the capacitor (Cs) connected to the CS terminal (pin 22) . When CTL terminal (pin 14) is placed under “H” level and IC is activated (VCC ≥ UVLO threshold voltage) , Q2 is turned off and the external soft-start capacitor (Cs) connected to the CS terminal is charged at 10 µA. Error Amp output (FB3 terminal (pin 15) ) is determined by comparison between the lower voltage of the two non-reverse input terminals (4.2 V and CS terminal voltage) a
Fujitsu MB3887, MB3887 21 ■ PROCESSING WITHOUT USING THE CURRENT AMP When Current Amp is not used, connect the +INC1 terminal (pin 13) , +INC2 terminal (pin 24) , −INC1 terminal (pin 12) , and −INC2 terminal (pin 1) to VREF, and then leave OUTC1 terminal (pin 10) and OUTC2 terminal (pin 2) open. 24 1312 1 2 10 6 −INC1 +INC1 +INC2 −INC2 OUTC1 OUTC2 VREF “Open” Connection when Current Amp is not used
Fujitsu MB3887, MB3887 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 of semiconductor device applications, and are not intended to be incorporated in devices for actual use. Also, FUJITSU is unable to assume responsibility for infringement of any patent rights or other rights of third parties arising from the use of this information or circuit diagrams. The products described in this document are designed, developed and manufactured as contemplated for general use, in
Fujitsu MB3887, MB3887 24 ■ APPLICATION EXAMPLE A B Q1 Output voltage (Battery voltage) is adjustable D1 I1 Battery R8 100 kΩ C10 5600 pF + + + R9 10 kΩ R14 1 kΩ R10 30 kΩ R11 30 kΩ R7 22 kΩ R18 200 kΩ R19 100 kΩ R17 100 kΩ C6 1500 pF C4 0.022 µF R3 330 kΩ R2 47 kΩ C9 0.1 µF C7 0.1 µF C5 0.1 µF C2 100 µF C3 100 µF C1 22 µF 0.033 Ω R1 22 µH L1 R4 82 kΩ R5 330 kΩ R6 68 kΩ R15 120 Ω R16 200 kΩ Q2 SW R12 30 kΩ R13 20 kΩ C8 10000 pF A B AC Adaptor IIN V O + − − + 8 10 13 12 9 + − − + 4 2 24 1 3 × 20 × 20 + + + − 5 20 21 19 − + + + − 11 16 22 17 6
Fujitsu MB3887, MB3887 9 (Ta = +25 °C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) * : Standard design value (Continued) Parameter Sym- bol Pin No. Conditions Value Unit Min Typ Max 5-2. Error amplifier block [Error Amp3] Threshold voltage V TH1 16 FB3 = 2 V, Ta = +25 °C 4.183 4.200 4.225 V V TH2 16 FB3 = 2 V, Ta = −10 °C to +85 °C 4.169 4.200 4.231 V Input current IINE3 16 −INE3 = 0 V −100 −30 nA Voltage gain A V 15 DC 100* dB Frequency bandwidth BW 15 AV = 0 dB 2* MHz Output voltage V FBH 15 4.7 4.9 V V FBL 15 20 200 mV Output source current I SOURCE 15 FB3 = 2 V −2 −1mA Output sink current ISINK 15 FB3 = 2 V 150 300 µA OUTD terminal
Fujitsu MB3887, MB3887 18 3. Soft-Start Function Soft-start block (SOFT) Connecting a capacitor to the CS terminal (pin 22) prevents rush currents when the IC is turned on. Using an error amplifier for soft-start detection makes the soft-start time constant, being independent of the output load of the DC/DC converter. ■ SETTING THE CHARGING VOLTAGE The charging voltage (DC/DC output voltage) can be set by connecting external voltage setting resistors (R3, R4) to the −INE3 terminal (pin 16) . Be sure to select a resistor value that allows you to ignore the on-resistor (35 Ω, 1mA) of the internal FET connected to the OUTD terminal (pin 11) . In standby mode, t
Fujitsu MB3887, MB3887 20 ■ AC ADAPTOR VOLTAGE DETECTION • With an external resistor connected to the +INE2 terminal (pin 3) , the IC enters the dynamically-controlled charging mode to reduce the charge current to keep AC adapter power constant when the partial potential point A of the AC adapter voltage (VCC) becomes lower than the voltage at the −INE2 terminal. AC adapter detection voltage setting : Vth Vth (V) = (R1 + R2) / R2 × −INE2 ■ OPERATION TIMING DIAGRAM − + VCC R1 R2 +INE2 −INE2 A <Error Amp2> 4 3 2.5 V 1.5 V Error Amp2 FB2 Error Amp1 FB1 Error Amp2 FB3 OUT Constant voltage control Constant current control AC adapter dyn
Fujitsu MB3887, MB3887 31 ■ PACKAGE DIMENSION 24-pin plastic SSOP (FPT-24P-M03) Note1: Pins width and pins thickness include plating thickness. Note2: * This dimension does not include resin protrusion. Dimensions in mm (inches) . C 2001 FUJITSU LIMITED F24018S-c-3-4 7.75±0.10(.305±.004) 5.60±0.10 7.60±0.20 (.220±.004) (.299±.008) * 0.10(.004) 112 1324 0.65(.026) –0.07 +0.08 0.24 .009 +.003 –.003 M 0.13(.005) INDEX 0.17±0.03 (.007±.001) "A" 0.25(.010) 0.10±0.10 (.004±.004) (Stand off) Details of "A" part (Mounting h
Fujitsu MB3887, MB3887 4 ■ PIN DESCRIPTION Pin No. Symbol I/O Descriptions 1 −INC2 I Current detection amplifier (Current Amp2) input terminal. 2 OUTC2 O Current detection amplifier (Current Amp2) output terminal. 3 +INE2 I Error amplifier (Error Amp2) non-inverted input terminal. 4 −INE2 I Error amplifier (Error Amp2) inverted input terminal. 5 FB2 O Error amplifier (Error Amp2) output terminal. 6 VREF O Reference voltage output terminal. 7 FB1 O Error amplifier (Error Amp1) output terminal. 8 −INE1 I Error amplifier (Error Amp1) inverted input terminal
Fujitsu MB3887, DS04-27709-3E FUJITSU SEMICONDUCTOR DATA SHEET ASSP For Power Supply Applications (Secondary battery) DC/DC Converter IC for Charging Li-ion battery MB3887 ■ DESCRIPTION The MB3887 is a DC/DC converter IC suitable for down-conversion, using pulse-width (PWM) charging and enabling output voltage to be set to any desired level from one cell to four cells. These ICs can dynamically control the secondary battery’s charge current by detecting a voltage drop in an AC adapter in order to keep its power constant (dynamically-controlled charging) . The charging method enables quick charging, for example, with the AC adapter during operation of a notebook PC
Fujitsu MB3887, MB3887 6 ■ ABSOLUTE MAXIMUM RATINGS * : The package is 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. Parameter Symbol Conditions Rating Unit Min Max Power supply voltage V CC VCC, VCC (O) terminal 28 V Output current IOUT 60 mA Peak output current I OUT Duty ≤ 5 % (t = 1 / f OSC × Duty) 700 mA Power dissipation P D Ta ≤ +25 °C 740* mW Storage temperature TSTG −55 +125 °C
MB3887 22 ■ PROCESSING WITHOUT USING OF THE ERROR AMP When Error Amp is not used, leave FB1 terminal (pin 7) , FB2 terminal (pin 5) open and connect the −INE1 terminal (pin 8) and −INE2 terminal (pin 4) to GND and connect +INE1 terminal (pin 9) , and +INE2 terminal (pin 3) , to VREF. 9 5 8 4 7 +INE1 GND +INE2 −INE1 −INE2 VREF FB2 FB1 23 6 3 “Open”
Fujitsu MB3887, MB3887 23 ■ PROCESSING WITHOUT USING OF THE CS TERMINAL When soft-start function is not used, leave the CS terminal (pin 22) open. ■ NOTE ON AN EXTERNAL REVERSE-CURRENT PREVENTIVE DIODE • Insert a reverse-current preventive diode at one of the three locations marked * to prevent reverse current from the battery. • When selecting the reverse current prevention diode, be sure to consider the reverse voltage (V R) and reverse current (IR) of the diode. 22 CS “Open” Connection when soft-start time is not specified VCC(O) OUT VIN VH I1 RS BATT Battery A B ∗ ∗ �
Fujitsu MB3887, MB3887 2 (Continued) • Output voltage setting using external resistor : 1 cell to 4 cells • High efficiency : 96% (VIN = 19 V, Vo = 16.8 V) • Wide range of operating supply voltages : 8 V to 25 V • Output voltage setting accuracy : 4.2 V ± 0.74% (Ta = −10 °C to +85 °C , per cell) • Charging current accuracy : ±5% • Built-in frequency setting capacitor enables frequency setting using external resistor only • Oscillation frequency range : 100 kHz to 500 kHz • Built-in current detection amplifier with wide in-phase input voltage range : 0 V to VCC • In standby mode, leave output voltage setting resistor open to prevent i
Fujitsu MB3887, MB3887 27 (Continued) 100 98 96 94 92 90 88 86 84 82 80 10 m 100 m 1 10 Ta = +25 °C VIN = 19 V BATT charge voltage = set at 16.8 V SW = ON Efficiency η (%) = (V BATT × IBATT) / (VIN × IIN) × 100 100 98 96 94 92 90 88 86 84 82 80 0 2 4 6 8 101214161820 Ta = +25 °C VIN = 19 V BATT charge voltage = set at 16.8 V SW = ON Efficiency η (%) = (V BATT × IBATT) / (VIN × IIN) × 100 Conversion efficiency vs. Charge current (Constant voltage mode) Conversion efficiency vs. Charge current (Constant current mode) Conversion efficiency η (%) BA
MB3887 13 (Continued) 1 M 100 k 10 k 10 100 1000 Ta = +25 °C VCC = 19 V CTL = 5 V 340 330 320 310 300 290 280 270 260 0 5 10 15 20 25 Ta = +25 °C CTL = 5 V RT = 47 kΩ 320 315 310 305 300 295 290 285 280 275 270 265 260 −40 −20 0 20 40 60 80 100 VCC = 19 V CTL = 5 V RT = 47 kΩ 4.25 2.24 4.23 2.22 4.21 4.20 4.19 4.18 4.17 4.16 4.15 −40 −20 0 20 40 60 80 100 VCC = 19 V CTL = 5
MB3887 28 (Continued) 100 0 −100 15 10 5 0 V BATT (mV) V D (V) Ta = +25 °C VIN = 19 V BATT = 1.5 A 98 mVp-p 012345678910 (µs) VD VBATT 100 0 −100 15 10 5 0 V BATT (mV) V D (V) Ta = +25 °C VIN = 19 V BATT = 3.0 A 98 mVp-p V D VBATT 012345678910 (µs) 100 0 −100 15 10 5 0 V BATT (mV) V D (V) Ta = +25 °C VIN = 19 V BATT = 1.5 A 58 mVp-p VBATT 012345678910 (µs) VD 100
Fujitsu MB3887, MB3887 17 (7) PWM comparator block (PWM Comp.) The PWM comparator circuit is a voltage-pulse width converter for controlling the output duty of the error amplifiers (Error Amp1 to Error Amp3) depending on their output voltage. The PWM comparator circuit compares the triangular wave generated by the triangular wave oscillator to the error amplifier output voltage and turns on the external output transistor during the interval in which the triangular wave voltage is lower than the error amplifier output voltage. (8) Output block
Fujitsu MB3887, MB3887 30 ■ USAGE PRECAUTIONS • 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 mounting, printed circuit boards should be stored and shipped in conductive bags or containers. • Work platforms, tools, and instruments should be properly grounded. • Working personnel should be grounded with resistance of 250 kΩ to 1 MΩ between body and ground. • Do not apply
Fujitsu MB3887, MB3887 11 (Continued) (Ta = +25 °C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) * : Standard design value Parameter Sym- bol Pin No. Conditions Value Unit Min Typ Max 8. Output block [OUT] Output source current I SOURCE 20 OUT = 13 V, Duty ≤ 5 % (t = 1 / fOSC × Duty) −400* mA Output sink current I SINK 20 OUT = 19 V, Duty ≤ 5 % (t = 1 / fOSC × Duty) 400* mA Output ON resistor ROH 20 OUT = −45 mA 6.5 9.8 Ω R OL 20 OUT = 45 mA 5.0 7.5 Ω Rise time tr1 20 OUT = 3300 pF (Si4435 ×
Fujitsu MB3887, MB3887 25 ■ PARTS LIST Note : VISHAY SILICONIX : VISHAY Intertechnology, Inc. ROHM : ROHM CO., LTD. TDK : TDK Corporation SANYO : SANYO Electric Co., Ltd. KYOCERA : Kyocera Corporation MURATA : Murata Manufacturing Co., Ltd. SEIDEN TECHNO : SEIDEN TECHNO CO., LTD. KOA : KOA Corporation ssm : SUSUMU Co., Ltd. OS-CON is a trademark of SANYO Electric Co., Ltd. COMPONENT ITEM SPECIFICATION VENDOR PARTS No. Q1 Q2 P-ch FET N-ch FET VDS = −30 V, ID = ±8 A (Max) VDS = 60 V, ID = 0.115 A (Max) VISHAY SILICONIX VISHAY SILICONIX Si4435DY 2N7002E D1 Diode VF = 0.42 V (Max) , IF = 3
MB3887 29 (Continued) 20 10 0 4 2 0 5 0 V CTL (V) V CS (V) V BATT (V) 0 2 4 6 8 101214161820 (ms) Ta = +25 °C, VIN = 19 V BATT = 12 Ω VBATT VCTL ts = 10.4 ms VCS 20 10 0 4 2 0 5 0 V CTL (V) V CS (V) V BATT (V) 0 2 4 6 8 101214161820 (ms) Ta = +25 °C VIN = 19 V BATT = 12 Ω VBATT VCTL VCS 20 10 0 4 2 0 5 0 V CTL (V) V CS (V) V BATT (V) 0 2 4 6 8 101214161820 (ms) VBATT ts = 10.4 ms VCS VCTL Ta
MB3887 3 ■ PIN ASSIGNMENT (TOP VIEW) (FPT-24P-M03) 1 2 3 4 5 6 7 8 9 10 11 12 −INC2 : OUTC2 : +INE2 : −INE2 : FB2 : VREF : FB1 : −INE1 : +INE1 : OUTC1 : OUTD : −INC1 : 24 23 22 21 20 19 18 17 16 15 14 13 : +INC2 : GND : CS : VCC (O) : OUT : VH : VCC : RT : −INE3 : FB3 : CTL : +INC1
Fujitsu MB3887, MB3887 5 ■ BLOCK DIAGRAM + − − + 8 10 13 12 9 + − − + 4 2 24 1 3 × 20 × 20 + + + − 5 20 21 19 − + + + − 11 16 22 17 6 23 14 18 <Current Amp1> <Error Amp1> 7 VREF <Current Amp2> <Error Amp2> VREF <Error Amp3> VREF VREF VREF 5.0 V 4.2 V 10 µA 15 <SOFT> 2.5 V 1.5 V <OUT> <UVLO> <OSC> Bias Voltage <VH> <REF> <CTL> <PWM Comp.> Drive VCC (V CC − 6 V) (VCC UVLO) VCC VCC VCC CTL 215 kΩ 35 kΩ 0.91 V (0.77 V) VREF UVLO 4.2 V bias −INC2 OUTD FB2 OUTC2 VREF −INE2 +INE2 +INE1 FB1 OUTC1 −INE1
Fujitsu MB3887, MB3887 16 ■ FUNCTIONAL DESCRIPTION 1. DC/DC Converter Unit (1) Reference voltage block (Ref) The reference voltage generator uses the voltage supplied from the VCC terminal (pin 18) to generate a tem- perature-compensated, stable voltage (5.0 V Typ) used as the reference supply voltage for the IC’s internal circuitry. This terminal can also be used to obtain a load current to a maximum of 1mA from the reference voltage VREF terminal (pin 6) . (2) Triangular wave oscillator block (OSC) The triangular wave oscillator builds the capacitor for freque
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