Document
AIC1563
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 circuit containing the primary functions required for DC to DC converters and highside-sensed constant current source. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current sense circuit, bootstrapped driver, and high current output switch. This device is specifically designed to construct a constant current source for battery chargers with a minimum number of external components. Bootstrapped driver can drive the NPN output switch to saturation for higher efficiency and less heat dissipation. The AIC1563 can deliver 1.5A continuous 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
R1 1K D2 1N1418 R2 120 3C 1µF 220µH L D1 1N5821 + 220µF DC DE CF 470pF CT GND BOOST IS VCC FB RA 5.6K RB 33K CO C5 10µF D3 1N5819
(%)
*RS IO
100
V IN = 16V, V O= 12V
+
90
VIN
+ 220µF C1
V IN= 16V, V O= 8V
80
70 0 0.5 1 1.5 2
AIC1563
*IO=300mV/RS
Efficiency vs Output Current
Io (A )
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 INFORMATION
AIC1563 XX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE C: 0°C~+70°C
ORDER NUMBER
AIC1563CN (PLASTIC DIP) AIC1563CS (PLASTIC SO)
PIN CONFIGURATION
TOP VIEW
DC 1 DE 2 CF 3 GND 4
8 BOOST 7 IS 6 VCC 5 FB
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ..............................................................……………............................. 30V Comparator Input Voltage Range ............................................………….......... -0.3V~30V Switch Collector Voltage ....................................................……………......................... 30V Switch Emitter Voltage ......................................................……………......................... 30V Switch Collector to Emitter Voltage ..................................…………............................. 30V Driver Collector Voltage ....................................................…………….......................... 30V Switch Current ................................................………………......................................... 2A Power Dissipation and Thermal Characteristics DIP Package Ta= 25°C ............................…………................................ 1.0W Thermal Resistance .............…………......................... 100°C/W SO Package Ta= 25°C ......................……………............................... 625mW Thermal 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 VCC 1K 50mA Current Source 1A Current Source 4.55V @VCC=5V DC DE 3 2V/0V IDISCHG/ ICHG 4 GND CF BOOST 8 IS VCC FB 7 6 5 1.275V 1.225V 4.75V
1 2
VCC
AIC1563
CT 1nF
2
AIC1563
AIC1563
ELECTRICAL CHARACTERISTICS (VCC= 5V, Ta=25°C, unless otherwise specified.)
PARAMETER
Oscillator Charging Current Discharge Current Voltage Swing Discharge to Charge Current Ratio Current Limit Sense Voltage Output Switch Saturation Voltage, Emitter Follower Connection Saturation Voltage IDE=1.0A; VBOOST =VDC = VCC IDC=1.0A; IBOOST =50mA, (Forced β≅20) ISC =1.0A; VCE=5.0V VCE=30V VCE(SAT) 1.5 1.8 V 5.0V≤VCC≤30V 5.0V≤VCC≤30V PIN 3 VIS =VCC ICHG IDISCHG VOSC IDISCHG / ICHG 10 100 25 150 0.6 6.0 40 200 µA µA V
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
ICHG=IDISCHG
VCC - VIS
250
300
350
mV
VCE (SAT)
0.4
0.7
V
DC Current Gain Collector Off-State Current Comparactor Threshold Voltage
hFE IC(OFF)
35
120 10 nA
Ta=25°C 0°C ≤ Ta ≤ 70°C
VFB
1.225 1.21
1.25
1.275 1.29
V V mV/V
Threshold Voltage Line Regulation Input Bias Current Supply Current
3.0V≤VCC≤30V VIN=0V VIS =VCC, pin 5>VFB 5.0V≤ VCC ≤30V CT=1nF PIN 2=GND Remaining pins open
REGLINE
0.1
0.3
IIB ICC
0.4 1.6
1 3
µA mA
3
AIC1563
AIC1563
TYPICAL PERFORMANCE CHARACTERISTICS
Output Switch ON-OFF Time vs Oscillator Timing Capacitor
tON-OFF, Output Switch ON-OFF Time (µS)
VCC=5V VIS =VCC PIN 5=GND ON -TIME
1000
Standby Supply Current vs Supply Voltage
2
ICC, Supply Current (mA)
1.6
100
1.2
CT = 1nF VIS = VCC PIN 2 =GND
0.8
10
OFF-TIME
0.4
1
0.1
1
10
100
0
CT, Oscillator Timing .