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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 1F 220H L D1 1N5821 + 220F DC DE CF 470pF CT GND BOOST IS VCC FB RA 5.6K RB 33K CO C5 10F D3 1N5819
(%)
*RS IO
100
V IN = 16V, V O= 12V
+
90
VIN
+ 220F 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: 0C~+70C
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= 25C ........................................................................ 1.0W Thermal Resistance .................................................. 100C/W SO Package Ta= 25C .................................................................... 625mW Thermal Resistance .................................................. 160C/W Operating Junction Temperature ........................................................................... 125C ............................................................... 0~70C Operating Ambient Temperature Range
Storage Temperature Range ................................................................... - 65C ~ 150C
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=25C, 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 20) ISC =1.0A; VCE=5.0V VCE=30V VCE(SAT) 1.5 1.8 V 5.0VVCC30V 5.0VVCC30V PIN 3 VIS =VCC ICHG IDISCHG VOSC IDISCHG / ICHG 10 100 25 150 0.6 6.0 40 200 A A 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=25C 0C Ta 70C
VFB
1.225 1.21
1.25
1.275 1.29
V V mV/V
Threshold Voltage Line Regulation Input Bias Current Supply Current
3.0VVCC30V
REGLINE
0.1
0.3
VIN=0V VIS =VCC, pin 5>VFB 5.0V VCC 30V CT=1nF PIN 2=GND Remaining pins open
IIB ICC
0.4 1.6
1 3
A mA
3
AIC1563
AIC1563
TYPICAL PERFORMANCE CHARACTERISTICS
Output Switch ON-OFF Time vs Oscillator Timing Capacitor
tON-OFF, Output Switch ON-OFF Time (S)
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 Capacitor (nF)
0
5
10
15
20
25
30
VCC, Supply Voltage (V)
VFB, Threshold Voltage vs Temperature
1.3
IS Threshold Voltage vs Temperature
350
VFB, Threshold Voltage (mV)
VFB, Threshold Voltage (V)
1.28
VCC = 5V, CT = 1nF, PIN 2 = GND
340 330 320 310 300 290 280 270 260 250 0
VCC = 5V, CT = 1nF, PIN 2 = GND
1.26
1.24
1.22
1.2
0
10
20
30
40
50
60
70
80
10
20
30
40
50
60
70
80
Temperature (C)
Temperature (C)
Emmiter Follower Configuration Output Switch Saturation Voltage vs Emmiter Current
1.8 0.8
Common Emitter Configuration Output Switch Saturation Voltage vs Collector Current
VCC = 5V PIN 7 = VCC PIN 2, 3, 5 = GND
VCE(SAT), Saturation Voltage (V)
1.7 1.6 1.5 1.4 1.3 1.2 0
VCE(SAT), Saturation Voltage (V)
VCC = 5V PIN 1, 7, 8 = VCC PIN 3, 5 = GND
0.6
0.4
0.2
Forced Beta = 20
0 0.5 IE,
Emitter Current (A)
1
1.5
0
0.5 IC,
Collector Current (A)
1
1.5
4
AIC1563
AIC1563
BLOCK DIAGRAM
DC 1 Q2 Q1 DE 2 80 7 QS R 8 BOOST
IS
Is CT Oscillator CF 3 Comparator 1.25V Reference Voltage GND 4 + 6 VCC
-
5 FB
PIN DESCRIPTIONS
PIN 1: DC PIN 2: DE PIN 3: CF - 2A switch collector. - Darlington switch emitter. - Oscillator timing capacitor. PIN 5: FB PIN 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 TABLE CALCULATION
t ON t OFF
STEP-DOWN
VOUT + VF VIN(MIN) - VSAT - VOUT 1 FMIN
STEP-UP
VOUT + VF - VIN(MIN) VIN(MIN) - VSAT 1 FMIN 4 x 10 tON 2IOUT(MAX) ( t ON + t OFF ) t OFF
-5
(tON + tOFF) MAX CT IC (SWITCH) RS L(MIN) Co (
4x10 tON 2IOUT(MAX) 0.3/IC(SWITCH) VIN(MIN) - VSAT - VOUT )tON(MAX) IC(SWITCH) IC ( SWITCH) (t ON + t OFF ) 8V RIPPLE (P - P ) (
-5
0.3/ IC (SWITCH) VIN(MIN) - VSAT )tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P - P)
5
AIC1563
AIC1563
VSAT = Saturation voltage of the output switch. = Forward voltage of the ringback rectifier VF The following power supply characteristics must be chosen: 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 voltage. In practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation.
- Desired output current.
APPLICATION EXAMPLES
VIN 12~15V C1 13F + R1 D1 1N4148 120 0.5W L1 220H + D2 1N5819 R2 1K 0.33 1W *RS C4 220F D4 1N5819 D3 1N4148 R5 1K R8 470 ZD1 9.1V BATTERY 3~5 CELLS + C7 100F LED1 RED R9 1K LED2 GREEN R10 1K
1 2 3 C4 470pF 4
DC DE CF GND
BOOST
8
C3 1F +
R3 100K R7 150K
IS 7 6 VCC FB 5 *Fast Charge Current =(0. 3/RS) Ampere
1 2 3 4
VBT GND
VREF
8
R4 51K
C6 0.1F + C5 4.7F
VDD 7 6 5
TIMER VOUT MODE LED
AIC1563
AIC1761/1766
Fig. 1 Simplified Battery Charge Circuit for Ni-Cd/ Ni-MH Battery
1K R2 C3 1F D2 R1 VIN
11V~15V
220H *L1 C4 220F 8 +
0.33/1W RS
D3 R15 300K R16 91K *BATTERY Thermistor
1N5819
R6 20/5W 100K + R5 C5 C6 4.7F 0.1F Q2 D468
R7 270
YELLOW
1
PEAK
DSW
16 R12
1N5821
D1
1N4148
+
680 R8
2 VBT 3 DIS 4 VTS
120/0.5W
1 + C1 10F C2 470pF 2
DC DE BOOST IS VCC
7 6
RX C7 RY 0.1F R9 200K R10 50K
3 CF 4 GND
5 VCC 6 ADJ 7 SEL3 8 TMR
220K LED2 14 R13 680 GREEN LED1 13 R14 RED GND 12 680
SEL1 11 SEL2 10
ICON 15
FB 5
AIC1563 78L05 R4 470 3904 Q1 C8 100F C9 0.1F
+
100K R11
MODE
9
*Iron Powder Core ** 3~5 NiMH/ NiCd Cells Note: Charge Current: 0.3V/RS Ampere Safety Timer=80 min. T/t=1C/min.
AIC1781
Fig. 2 Battery Charge Circuit for Fluctuating Charging Current Applications
6
AIC1563
AIC1563
APPLICATION EXAMPLES
(CONTINUED)
D3 R1 470 D2 1N4148 8 VIN 8V~25V + RS 0.22 7 6 5 C3 1N4148 L1 300H D1 1N5819 R2 390K C2 1000pF RB RA 1K 3K + 5V/1A C4 470F
+
1F 1 2 3 4
BOOST IS VCC FB
DC DE CF GND
C1 100F
AIC1563 When VIN>15V, Then, R1=1K R3 2.2M
Line Regulation Load Regulation Short Circuit Current
VIN = 10V~20V @ IO=1A VIN = 15V, @ IO=100mA~1A VIN =15V, @ RL = 0.1
Fig. 3 Step-Down Converter
40mV 20mV 1.3A
D1 5V 1N5819
C3 + 1F 8 1 2 3 4 C2 470pF AIC1563
L1 300H D1 1N5819 + 12V/1A C4 470F
VIN 16V~25V +
RS 0.22
BOOST IS VCC FB
DC DE CF GND
7 6 5
RB RA 1K 13K
C1 100F
Fig. 4 Step-Down Converter with External 5V Bootstrap
7
AIC1563
AIC1563
APPLICATION EXAMPLES (CONTINUED)
200H L R1 150 8 BOOST RS 0.22 VIN + C1 7 IS 6 VCC 100F 5 FB DC 1 DE 2 CF 3 GND 4 CT AIC1563 RA 2.2K RB 47K 680pF D1 VOUT 1N5819 + 200F
C0
28V/200mA
Line Regulation Load Regulation
VIN = 8V~16V @ IO=200mA VIN = 12V, @ IO=80mA~200mA
Fig. 5 Step-Up Converter
100mV 40mV
L R1 8 RS VIN + C1 7 6 5 BOOST IS VCC FB A RA RB DC DE CF GND 1 2 3 4 CT R2 Q1
D1
VOUT
C0
+
Fig. 6 Step-Up Converter with External NPN Switch
8
AIC1563
AIC1563
APPLICATION EXAMPLES (CONTINUED)
1 2 L D1 1N5819 100H CT 600pF 3 4
DC DE CF GND
BOOST IS VCC
8 7 6 5 + C1 100F RS 0.26 VIN 4.5V~6V
FB AIC1563 953 RB
RB 8.2K
VOUT -12V/100mA
+
C0 470F
Line Regulation Load Regulation
VIN = 4.5V~6V @ IO=100mA VIN = 5V, @ IO=10mA~100mA
Fig.7 Inverting Converter
20mV 100mV
PHYSICAL DIMENSIONS
8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL A
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40
MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 1.27
A1 B C D E
e A C
A1
e H L
L
1.27(TYP)
B
9
AIC1563
AIC1563
8 LEAD PLASTIC DIP (unit: mm)
D
SYMBOL A1
E1
MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09 -- 2.92
MAX -- 4.96 0.56 0.36 10.16 8.26 7.12 10.92 3.81
A2 b C
E
D E
C
A2 A1
L
E1 e eB L
2.54 (TYP)
eB b e
10

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