AIC1563
Versatile DC/DC Converter
n FEATURES
n DESCRIPTION
l
3V to 30V Input Voltage Operation.
The AIC1563 is a monolithic control circuit con-
l
Internal 2A Peak Current Switch.
taining the primary functions required for DC to
l
1.5A Continuous Output Current.
DC converters and highside-sensed constant cur-
l
Bootstrapped Driver.
rent source. The device consists of an internal
l
High Side Current Sense Capability.
temperature compensated reference, comparator,
l
High Efficiency (up to 90%).
controlled duty cycle oscillator with an active cur-
l
Internal ±2% Reference.
rent sense circuit, bootstrapped driver, and high
l
Low Quiescent Current at 1.6mA.
current output switch. This device is specifically
l
Frequency Operation from 100Hz to 100KHz.
designed to construct a constant current source
for battery chargers with a minimum number of
n APPLICATIONS
external components. Bootstrapped driver can
l
Constant Current Source for Battery Chargers.
drive the NPN output switch to saturation for
l
Saver for Cellular phones.
higher efficiency and less heat dissipation. The
l
Step-Down DC-DC Converter Module.
AIC1563 can deliver 1.5A continuous current
without requiring a heat sink.
n TYPICAL APPLICATION CIRCUIT
D3
R1
470
D2
+
1N4148
1N4148
C3
300µH
1µF
8
RS
0.22
V IN
8V~25V
BOOST
DC
IS
DE
VCC
CF
7
C1
100µF
5
GND
FB
D1
1N5819
1
2
6
+
L1
3
4
+
5V/1A
C4
470µF
R2
390K
C2
1000pF
AIC1563
RB
RA
1K
3K
R3
When V IN>15V,
Then, R1=1K
2.2M
Line Regulation
VIN = 10V~20V @ IO=1A
40mV
Load Regulation
VIN = 15V, @ IO=100mA~1A
20mV
Short Circuit Current
VIN =15V, @ RL = 0.1Ω
Step-Down Converter
1.3A
Analog Integrations Corporation
4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-1563-02 012102
1
AIC1563
AIC1563
n ORDERING INFORMATION
PIN CONFIGURATION
AIC1563-CXXX
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
PACKAGING TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
DIP-8
SO-8
TOP VIEW
DC 1
8 BOOST
DE 2
7 IS
6 VCC
CF 3
GND 4
5 FB
Example: AIC1563CSTR
à in SO-8 Package & Taping & Reel
Packing Type
(CN is not available in TR packing)
n 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
Operating Ambient Temperature Range .......................… … … … … ......................... 0~70°C
Storage Temperature Range ...................................… … … … .................... - 65°C ~ 150°C
2
AIC1563
AIC1563
n TEST CIRCUIT
R1
VCC
1K
50mA
Current Source
4.55V
@VCC=5V
1A
Current Source
1
BOOST 8
DC
2
3
2V/0V
IDISCHG/ ICHG
DE
IS
CF
VCC
4
FB
GND
4.75V
7
6
VCC
5
1.275V
1.225V
AIC1563
CT
1nF
n ELECTRICAL CHARACTERISTICS (V
PARAMETER
TEST CONDITIONS
CC=
5V, TA=25°C, unless otherwise specified.)
SYMBOL
MIN.
TYP.
MAX.
UNIT
Oscillator
Charging Current
5.0V≤VCC≤30V
ICHG
10
25
40
µA
Discharge Current
5.0V≤VCC≤30V
IDISCHG
100
150
200
µA
Voltage Swing
PIN 3
Discharge to Charge Current
Ratio
VIS =VCC
Current Limit Sense Voltage
ICHG=IDISCHG
VOSC
0.6
IDISCHG / ICHG
6.0
VCC – VIS
250
V
300
350
mV
Output Switch
Saturation Voltage, Emitter
Follower Connection
IDE=1.0A;
VBOOST =VDC = VCC
VCE(SAT)
1.5
1.8
V
Saturation Voltage
IDC=1.0A; IBOOST
=50mA, (Forced β≅20)
VCE (SAT)
0.4
0.7
V
DC Current Gain
ISC =1.0A; VCE =5.0V
Collector Off-State Current
VCE =30V
hFE
IC(OFF)
35
120
10
nA
3
AIC1563
AIC1563
n ELECTRICAL CHARACTERISTICS (V
PARAMETER
TEST CONDITIONS
CC=
5V, TA=25°C, unless otherwise specified.)
SYMBOL
MIN.
TYP.
MAX.
UNIT
1.275
V
1.29
V
Comparactor
Threshold Voltage
TA=25°C
0°C ≤ TA ≤ 70°C
Threshold Voltage Line
Regulation
3.0V≤VCC≤30V
Input Bias Current
Supply Current
1.21
1.25
REGLINE
0.1
0.3
mV/V
VIN=0V
IIB
0.4
1
µA
VIS =VCC, pin 5>VFB
5.0V≤ VCC ≤30V
CT =1nF
PIN 2=GND
Remaining pins open
ICC
1.6
3
mA
PERFORMANCE CHARACTERISTICS
2
ICC , Supply Current (mA)
1000
VCC=5V
VIS =VCC
PIN 5=GND
100
ON -TIME
10
OFF-TIME
1.6
C T = 1nF
1.2
V IS = VCC
PIN 2 =GND
0.8
0.4
1
tON-OFF, Output Switch ON-OFF Time (µS)
n TYPICAL
1.225
VFB
0.1
1
10
CT, Oscillator Timing Capacitor (nF)
Fig. 1 Output Switch ON-OFF Time vs. Oscillator
Timing Capacitor
100
0
0
5
10
15
20
25
30
VCC, Supply Voltage (V)
Fig. 2 Standby Supply Current vs. Supply Voltage
4
AIC1563
AIC1563
n TYPICAL
PERFORMANCE CHARACTERISTICS
1.3
350
VFB, Threshold Voltage (V)
VCC-VIS Threshold Voltage (mV)
VCC = 5V,
CT = 1nF,
PIN 2 = GND
1.28
1.26
1.24
1.22
1.2
0
10
20
30
40
50
60
Temperature (°C)
70
80
340
330
320
300
290
280
270
260
250
0
VCE(SAT), Saturation Voltage (V)
0.8
VCC = 5V
PIN 1, 7, 8 = VCC
PIN 3, 5 = GND
1.6
1.5
1.4
1.3
0.6
0.5
1
20
30
40
50
60
70
80
Temperature (°C)
IS Threshold Voltage vs. Temperature
VCC = 5V
PIN 7 = VCC
PIN 2, 3, 5 = GND
0.4
Forced Beta = 20
0.2
1.2
0
10
Fig. 4
1.8
1.7
VCC = 5V,
CT = 1nF,
PIN 2 = GND
310
Fig. 3 VFB , Threshold Voltage vs. Temperature
VCE(SAT), Saturation Voltage (V)
(Continued)
0
0
1.5
0.5
IE, Emitter Current (A)
1
1.5
IC, Collector Current (A)
Fig. 5 Emmiter Follower Configuration Output Switch
Saturation Voltage vs. Emmiter Current
Fig. 6 Common Emitter Configuration Output Switch
Saturation Voltage vs. Collector Current
n BLOCK DIAGRAM
1
DC
8
Q2
Q1
BOOST
QS
R
80
2
DE
7
IS
Is
CT
Oscillator
CF
6
3
VCC
Comparator
1.25V
Reference
Voltage
GND
4
+
5
FB
5
AIC1563
AIC1563
n PIN DESCRIPTIONS
PIN 1: DC
- The switch collector is 2A.
PIN 5: FB
PIN 2: DE
- Darlington switch emitter.
PIN 6: VCC - Power supply input.
PIN 3: CF
- Oscillator timing capacitor.
PIN 7: IS
PIN 4: GND - Power ground.
- Feedback comparator inverting input.
- Highside current sense input.
VCC - VIS=300mV.
PIN 8: BOOST -Bootstrapped driver collector.
n APPLICATION INFORMATIONS
DESIGN FORMULA TABLE
l
CALCULATION
STEP-DOWN
STEP-UP
VOUT + VF
VIN(MIN) - VSAT - VOUT
1
FMIN
VOUT + VF - VIN(MIN)
VIN(MIN) - VSAT
1
FMIN
CT
4x10-5tON
4 x 10-5tON
IC (SWITCH)
2IOUT(MAX)
t ON
t OFF
(t ON + t OFF) MAX
RS
0.3/IC(SWITCH)
L(MIN)
Co
(
The following power supply characteristics must be
chosen:
VIN
- Nominal input voltage.
VOUT
- Desired output voltage,
VOUT = 1.25 (1 + RB/RA)
t ON + t OFF
)
tOFF
0.3/ IC (SWITCH)
VIN(MIN) - VSAT - VOUT
) tON(MAX)
IC(SWITCH)
IC ( SWITCH) ( t ON + t OFF )
8 VRIPPLE(P - P)
VSAT = Saturation voltage of the output switch.
VF
= Forward voltage of the ringback rectifier
IOUT
2IOUT(MAX) (
FMIN
(
VIN(MIN) - VSAT
) tON(MAX)
IC(SWITCH)
IOUT tON
VRIPPLE(P - P)
- Minimum desired switching frequency at
selected values for VIN and IOUT .
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.
6
AIC1563
AIC1563
n APPLICATION EXAMPLES
D1
R2
1K
D2
L1
IN4148
C4
220 µF
4
C1
DE
IS
+
GND
FB
470P
C3
220µF
AIC1563
680
4
MPS2222A
DIS
6
RX
R7
R14
200K
+
RY
C6
0.1 µ F
C11
100µF
C8
7
R6
8
50K
0.1µF
R11
15
LED2
14
GND
ADJ
SEL1
SEL3
SEL2
TMR
MODE
LED3
GREEN
RED
R16
R17
680
16
ICON
LED1
VTS
BAT1
VCC
5
47nF
3
VCC
RS 0.3/1W
6
CF
C10
C7
0.1µF
VBT
R15
5
THERMISTOR
3
2
Q1
91K
IN4148
7
C9
4.7µF
R9
1N5819
DSW
PEAK
+
**BATTERY
2
390K
BOOST
1
LED2
R12
100K
U2
YELLOW
0.1µF
D4
D3
8
DC
PB SW
R10
100K
R8
300 K
C5
U1
1
20/5W
IN5819
+
1µF
R5 120/0.5W
R4
270
LED1
220 µ H
C2
SW1
R3
R1
680
13
12
11
10
9
AIC1781
100K
U3
VIN
11~15V
VOUT
VIN
+
R13
470K
78L05
Q2
MMBT2222A
+
C12
C13
GND
1µF
10µF
**3~5 NiMH/NiCd cells.
Note: Charge Current=0.3/RS Ampere
Safety Timer: 80min
Fig. 1 Battery Charge Circuit for Fluctuating Charging Current Applications
R1
220µ H
1K
C3
1µ F
R2
120
D2
D3
1N5819
(%)
*RS
D1
1N5821
1N4148
VIN = 16 V , V O= 1 2 V
220µF
+
CT
CO
DE
IS
CF
VCC
GN D
AIC1563
90
C5
10µF
BOOST
DC
220µF
C1
470pF
+
IO
L
+
V IN
100
VIN = 16 V , V O= 8 V
80
RB
FB
RA
5.6K
33K
70
0
*I O=300mV/RS
0.5
1
1.5
2
Io (A )
Efficiency vs Output Current
Fig. 2 Battery Charge Circuit
6
AIC1563
AIC1563
n APPLICATION EXAMPLES (Continued)
C3
D1
L1
+
5V
1N5819
300µH
1µF
8
RS
0.22
V IN
BOOST
DC
IS
DE
VCC
CF
7
6
16V~25V +
5
C1
100µF
GND
FB
D1
1N5819
1
+
12V/1A
C4
470µF
2
3
4
RB
C2
470pF
RA
1K
AIC1563
13K
Fig. 3 Step-Down Converter with External 5V Bootstrap
200 µH
D1
VOUT
L1
1N5819
R1
150
RS
0.22
VIN
8~16V
C1
+
100µF
28V/200mA
+
8 BOOST
DC 1
7
IS
DE 2
6 VCC
CF 3
220 µF
C0
GND 4
5 FB
CT
680pF
AIC1563
RA
RB
2K2
47K
Line Regulation
VIN = 8V~16V @ IO=200mA
Load Regulation
VIN = 12V, @ IO=80mA~200mA
100mV
40mV
Fig. 4 Step-Up Converter
7
AIC1563
AIC1563
n APPLICATION EXAMPLES (Continued)
D1
L
VOUT
R1
+
8
BOOST
DC
IS
DE
7
RS
VIN
6
CF
VCC
+
5
C1
FB
GND
C0
1
2
Q1
3
R2
4
CT
AIC1563
RA
RB
Fig. 5 Step-Up Converter with External NPN Switch
1
2
L1
4
CT
560pF
1N5819
V OUT
-12V/100mA
BOOST
DE
IS
CF
VCC
3
100µH
D1
DC
8
7
6
5
GND
FB
953
RB
C0
V IN
4.5V~6V
+
100µF
C1
AIC1563
+
0.26
RS
RA
8.2K
470µF
Line Regulation
VIN = 4.5V~6V @ IO=100mA
20mV
Load Regulation
VIN = 5V, @ IO=10mA~100mA
100mV
Fig. 6 Inverting Converter
8
AIC1563
AIC1563
n PHYSICAL DIMENSIONS
l
8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
5.00
E
3.80
4.00
H
E
e
e
A
A1
C
B
l
1.27(TYP)
H
5.80
6.20
L
0.40
1.27
L
8 LEAD PLASTIC DIP (unit: mm)
D
E1
E
A2
A1
C
L
eB
b
SYMBOL
MIN
A1
0.381
—
A2
2.92
4.96
b
0.35
0.56
C
0.20
0.36
D
9.01
10.16
E
7.62
8.26
E1
6.09
7.12
e
MAX
2.54 (TYP)
eB
—
10.92
L
2.92
3.81
e
9