Versatile DC/DC Converter
FEATURES
3V to 30V Input Voltage Operation.Internal 2A Peak Current Switch.1.5A Continuous Output Current.Bootstrapped Driver.
High Side Current Sense Capability.High Efficiency (up to 90%).
Internal ±2% Reference.
Low Quiescent Current at 1.6mA.
Frequency Operation from 100Hz to 100KHz.
DESCRIPTION
The AIC1563 is a monolithic control circuitcontaining the primary functions required for DC to DC converters and highside-sensed constantcurrent source. The device consists of an inter-nal temperature compensated reference, com-parator, controlled duty cycle oscillator with anactive current sense circuit, bootstrapped driver,and high current output switch. This device isspecifically designed to construct a constantcurrent source for battery chargers with a mini-mum number of external components. Boot-strapped driver can drive the NPN output switchto saturation for higher efficiency and less heatdissipation. The AIC1563 can deliver 1.5A con-tinuous current without requiring a heat sink.
APPLICATIONS
Constant Current Source for Battery Chargers.
Saver for Cellular phones.
Step-Down DC-DC Converter Module.
TYPICAL APPLICATION CIRCUIT
R11KD21N1418R21203C1µF220µHLD11N5821+220µFDC220µFC1DECF470pFCTGNDBOOSTISVCCFBRA5.6KRB33KCOC510µFD31N5819(%)
*RSIO100
VIN=16V,VO=12V+90
VIN
+VIN=16V,VO=8V80
700
0.5
1
1.5
2
AIC1563*IO=300mV/RSIo (A)
Efficiency vs Output Current
Analog Integrations Corporation DS-1563-01 Jan 30, 01
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
1
AIC1563
AIC1563
ORDERING INFORMATIONAIC1563 XXORDER NUMBERPACKAGE TYPEN: PLASTIC DIPS: SMALL OUTLINETEMPERATUREC: 0°C~+70°CAIC1563CN(PLASTIC DIP)AIC1563CS(PLASTIC SO)PIN CONFIGURATIONTOP VIEWDC1DE2CF3GND48BOOST7IS6VCC5FB ABSOLUTE MAXIMUM RATINGS
Supply Voltage..............................................................……………............................. 30VComparator Input Voltage Range............................................………….......... -0.3V~30VSwitch Collector Voltage....................................................……………......................... 30VSwitch Emitter Voltage......................................................……………......................... 30VSwitch Collector to Emitter Voltage..................................…………............................. 30VDriver Collector Voltage....................................................…………….......................... 30VSwitch Current ................................................………………......................................... 2APower Dissipation and Thermal Characteristics
DIP Package
Ta= 25°C............................…………................................ 1.0WThermal Resistance.............…………......................... 100°C/W
SO Package
Ta= 25°C......................……………............................... 625mWThermal Resistance...................………...................... 160°C/W
Operating Junction Temperature.....................................................………............. 125°C
.......................……………......................... 0~70°C
Operating Ambient Temperature Range
Storage Temperature Range...................................………….................... - 65°C ~ 150°C
TEST CIRCUIT
R1
VCC1K50mACurrent Source1ACurrent Source4.55V@VCC=5VDCDE32V/0VIDISCHG/ ICHG4GNDCFBOOST8ISVCCFB7651.275V1.225V4.75V12VCCAIC1563CT
1nF2
AIC1563
AIC1563
ELECTRICAL CHARACTERISTICS (VCC= 5V, Ta=25°C, unless otherwise specified.)
PARAMETER
OscillatorCharging CurrentDischarge CurrentVoltage Swing
Discharge to Charge Cur-rent Ratio
Current Limit Sense VoltageOutput Switch
Saturation Voltage, EmitterFollower ConnectionSaturation Voltage
IDE=1.0A;
VBOOST =VDC = VCCIDC=1.0A; IBOOST
=50mA, (Forced β≅20)ISC =1.0A; VCE=5.0VVCE=30V
VCE(SAT)
1.5
1.8
V
5.0V≤VCC≤30V5.0V≤VCC≤30VPIN 3VIS =VCC
ICHGIDISCHGVOSCIDISCHG / ICHG
10100
251500.66.0
40200
µAµAV
TEST CONDITIONSSYMBOLMIN.TYP.MAX.UNIT
ICHG=IDISCHGVCC - VIS250300350mV
VCE (SAT)0.4
0.7
V
DC Current Gain
Collector Off-State CurrentComparactorThreshold Voltage
hFEIC(OFF)
3512010
nA
Ta=25°C0°C ≤ Ta ≤ 70°C
VFB1.2251.21
1.251.2751.29
VVmV/V
Threshold Voltage LineRegulationInput Bias CurrentSupply Current
3.0V≤VCC≤30VREGLINE0.10.3
VIN=0V
VIS =VCC, pin 5>VFB5.0V≤ VCC ≤30VCT=1nFPIN 2=GND
Remaining pins open
IIBICC
0.41.6
13
µAmA
3
AIC1563
AIC1563
TYPICAL PERFORMANCE CHARACTERISTICS
Output Switch ON-OFF Time vs Oscillator Timing
Capacitor
tON-OFF, Output Switch ON-OFF Time (µS)1000Standby Supply Current vs Supply Voltage
2
ICC, Supply Current (mA)VCC=5VVIS =VCCPIN 5=GNDON -TIME1.6
1001.2
CT = 1nFVIS = VCCPIN 2 =GND0.8
10OFF-TIME0.4
10.11101000
CT, Oscillator Timing Capacitor (nF)
05101520
2530VCC, Supply Voltage (V)
VFB, Threshold Voltage vs Temperature
1.3
ISThreshold Voltage vs Temperature
350
VFB, Threshold Voltage (mV)VFB, Threshold Voltage (V)1.28
VCC = 5V,CT = 1nF,PIN 2 = GND340330320310300290280270260250
0VCC = 5V,CT = 1nF,PIN 2 = GND1.26
1.24
1.22
1.2
01020304050607080
1020304050607080Temperature (°C)
Temperature (°C)
Emmiter Follower Configuration Output Switch
Saturation Voltage vs Emmiter Current
1.8
0.8Common Emitter Configuration Output SwitchSaturation Voltage vs Collector Current
VCC = 5VPIN 7 = VCCPIN 2, 3, 5 = GNDVCE(SAT), Saturation Voltage (V)1.71.61.51.41.31.2
0
VCE(SAT), Saturation Voltage (V)VCC = 5VPIN 1, 7, 8 = VCCPIN 3, 5 = GND0.60.4Forced Beta = 200.20
0.51IE, Emitter Current (A)
1.5
0
0.51
IC, Collector Current (A)
1.5
4
AIC1563
AIC1563
BLOCK DIAGRAM
DC1Q2Q1DE2807QSR8BOOST
ISIsCTOscillatorCF3Comparator1.25VReferenceVoltageGND
4+6VCC-5FB PIN DESCRIPTIONS
PIN 1:DCPIN 2:DEPIN 3:CF
-2A switch collector.-Darlington switch emitter.-Oscillator timing capacitor.
PIN 5:FBPIN 7:IS
-Feedback comparator inverting input.-Highside current sense input.VCC - VIS=300mV.
PIN 6:VCC-Power supply input.
PIN 4:GND-Power ground.
PIN 8:BOOST-Bootstrapped driver collector.
APPLICATION INFORMATIONS
DESIGN FORMULA TABLECALCULATIONtONtOFFSTEP-DOWNVOUT+VFVIN(MIN) - VSAT - VOUT1FMINSTEP-UPVOUT+VF -VIN(MIN)VIN(MIN)-VSAT1FMIN4 x 10tON2IOUT(MAX) (tON+tOFF)tOFF-5(tON + tOFF) MAXCTIC (SWITCH)RSL(MIN)Co(4x10tON2IOUT(MAX)0.3/IC(SWITCH)VIN(MIN)-VSAT-VOUT)tON(MAX)IC(SWITCH)IC(SWITCH)(tON+tOFF)8VRIPPLE (P-P)(-50.3/ IC (SWITCH)VIN(MIN)-VSAT)tON(MAX)IC(SWITCH)IOUTtONVRIPPLE(P-P)5
AIC1563
AIC1563
VSAT =Saturation voltage of the output switch.
=Forward voltage of the ringback rectifierVF
The following power supply characteristics must bechosen:VIN VOUT IOUT
FMIN
-Minimum desired switching frequency at
selected values for VIN and IOUT.
-Nominal input voltage.-Desired output voltage,
VOUT = 1.25 (1 + RB/RA)
VRIPPLE (P-P) -Desired peak-to-peak output ripple volt-age. In practice, the calculated value willneed to be increased due to the capacitorequivalent series resistance and boardlayout. The ripple voltage should be keptto a low value since it will directly affectthe line and load regulation.
-Desired output current.
APPLICATION EXAMPLES
VIN
12~15VC113µF+R1D11N41481200.5WL1220µH+R21K0.33Ω1W*RSD41N5819D31N4148R51KR8470ZD19.1VBATTERY3~5 CELLS+C7100µFLED1REDR91KLED2GREENR101K123C4470pF4DCDECFGNDBOOST8C31µF+ C4D2220µF1N5819R3100KR7150KIS76VCCFB5*Fast Charge Current =(0.3/RS) Ampere1234VBTGNDVREF8R451KC60.1µF+C54.7µFVDD765TIMERVOUTMODELED
AIC1563AIC1761/1766Fig. 1 Simplified Battery Charge Circuit for Ni-Cd/ Ni-MH Battery
1KR2C31µFD2R1D11N4148220µH*L1C4+220µF80.33/1WRSD3R15300KR1691K*BATTERYThermistor1N5819R620/5W100K+R5C5C64.7µF0.1µFQ2D468R7270YELLOW1PEAKDSW16R121N5821+680R82VBT3DIS4VTSVIN11V~15V120/0.5W1+C110µFC2470pF2DCDEBOOSTISVCC76RXC7RY0.1µFR9200KR1050K3CF4GND5VCC6ADJ7SEL38TMR220KLED214R13680GREENLED113R14REDGND12680SEL111SEL210ICON15FB5AIC156378L05R44703904Q1C8100µFC90.1µF+100KR11MODE9*Iron Powder Core** 3~5 NiMH/ NiCd CellsNote: Charge Current: 0.3V/RS AmpereSafety Timer=80 min.∆T/∆t=1°C/min.
AIC1781Fig. 2 Battery Charge Circuit for Fluctuating Charging Current Applications
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AIC1563
AIC1563
APPLICATION EXAMPLES (CONTINUED)
D3R1470D21N41488VIN8V~25V+RS0.22765C31N4148L1300µHD11N5819R2390KC21000pFRBRA1K3K+5V/1AC4470µF+1µF1234BOOSTISVCCFBDCDECFGNDC1100µFAIC1563When VIN>15V,Then, R1=1KR32.2MLine RegulationLoad RegulationShort Circuit Current
VIN = 10V~20V @ IO=1AVIN = 15V, @ IO=100mA~1AVIN =15V, @ RL = 0.1Ω
Fig. 3 Step-Down Converter
40mV20mV1.3A
D15V1N5819C3+1µF81234C2470pFAIC1563L1300µHD11N5819+12V/1AC4470µFVIN16V~25V+RS0.22BOOSTISVCCFBDCDECFGND765RBRA1K13KC1100µFFig. 4 Step-Down Converter with External 5V Bootstrap
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AIC1563
AIC1563
APPLICATION EXAMPLES (CONTINUED)
200µHLR11508BOOSTRS0.22VIN+C17IS6VCC100µF5FBDC1DE2CF3GND4CTAIC1563RA2.2KRB47K680pFD1VOUT
1N5819+200µFC028V/200mALine RegulationLoad Regulation
VIN = 8V~16V @ IO=200mAVIN = 12V, @ IO=80mA~200mA
Fig. 5 Step-Up Converter
100mV40mV
LD1VOUTR18RSVIN+C1765BOOSTISVCCFBARARBDCDECFGND1234CTR2Q1C0+Fig. 6 Step-Up Converter with External NPN Switch
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AIC1563
AIC1563
APPLICATION EXAMPLES (CONTINUED)
12LD11N5819100µHCT600pF34DCDECFGNDAIC1563953RBBOOSTISVCC5FBC1876+100µFRS0.26VIN
4.5V~6V
RB8.2KVOUT-12V/100mA+C0470µFLine RegulationLoad Regulation
VIN = 4.5V~6V @ IO=100mAVIN = 5V, @ IO=10mA~100mA
Fig.7 Inverting Converter
20mV100mV
PHYSICAL DIMENSIONS
8 LEAD PLASTIC SO (unit: mm)
DSYMBOL
AA1
HEMIN1.350.100.330.194.803.805.800.40
MAX1.750.250.510.255.004.006.201.27
BCDE
eACA1eHL
L1.27(TYP)
B9
AIC1563
AIC1563
8 LEAD PLASTIC DIP (unit: mm)
DSYMBOLA1
E1MIN0.3812.920.350.209.017.626.09—2.92
MAX—4.960.560.3610.168.267.1210.923.81
A2bC
EDE
CA2A1LE1eeBL
2.54 (TYP)
eBbe10
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