AIC1563
Versatile DC/DC Converter
Analog Integrations Corporation  Si-Soft Research Center
DS-1563P-06  062906
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
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.
APPLICATIONS
Constant Current Source for Battery Chargers.  Step-Down DC-DC Converter Module.
Saver for Cellular phones.
DESCRIPTION  The AIC1563 is a monolithic control circuit con-taining 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 cur-rent 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.
TYPICAL APPLICATION CIRCUIT
* R 1R 1
Line Regulation V IN  = 10V~20V  @ I =1A 40mV O Load Regulation V IN  = 15V, @ I =100mA~1A 20mV O Short Circuit Current
1.3A
V IN  =15V, @ R L  = 0.1Ω Step-Down Converter
ABSOLUTE MAXIMUM RATINGS
…………….............................30V
Comparator Input .………….......... -0.3V~30V
Switch Collector Voltage ....................................................…………….........................30V
Switch Emitter Voltage ......................................................……………......................... 30V
Switch Collector to Emitter Voltage ..................................………….............................30V
Driver Collector Voltage ....................................................……………..........................30V
Switch Current  ................................................………………......................................... 2A
Thermal Resistance Junction to Case  SOP8 40°C/W
DI60°C/W
P8
Thermal Resistance Junction to Ambient  SOP8 160°C/W
(Assume no ambient airflow, no heatsink)      DIP8 100°C/W
Operating Junction Temperature .....................................................………............. 125°C
Operating Ambient .……………......................... -40~85°C
Storage Temperature Range ...................................…………....................  - 65°C ~ 150°C
Lead Temperature (Soldering 10 Sec.)  …………………………………………………260°C
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
* R1
R1
ELECTRICAL CHARACTERISTICS(V CC= 5V, T A=25°C, unless otherwise specified.) (Note1)
PARAMETER  TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT Oscillator
Charging Current    5.0V≤VCC≤30V I CHG10 25 40 µA
Discharge Current    5.0V≤VCC≤30V I DISCHG100 150 200 µA
Voltage Swing PIN 3 V OSC 0.6  V
Discharge to Charge Cur-
rent Ratio
V IS =VCC I DISCHG/ I CHG    6.0  Current Limit Sense Voltage I CHG=I DISCHG VCC – V IS250 300 350 mV Output Switch
Saturation Voltage, Emitter Follower Connection I D A;
V
E=1.0
BOOST =V DC = VCC
V CE(SAT)    1.5 1.8 V
Saturation Voltage I DC=1.0A; I BOOST
=50mA, (Forced β≅20)
V CE (SAT) 0.4 0.7 V
DC Current Gain I SC =1.0A; V CE=5.0V h FE35 120
Collector Off-State Current V CE=30V I C(OFF) 10  nA Comparactor
Threshold Voltage  T A=25°C
0°C ≤ T A≤ 70°C V FB
1.225
1.21
1.25
1.275
1.29
V
V
Threshold Voltage Line Regulation 3.0V≤VCC≤30V REG LINE 0.1 0.3
mV/V
Input Bias Current V IN=0V I IB 0.4 1 µA
Supply Current  V IS =VCC, pin 5>V
≤  C ≤30V
FB
5.0V VC
C T=1nF
PIN 2=GND
Remaining pins open
I CC    1.6 3 mA
Note 1:Specifications are production tested at T A=25 C. Specifications over the -40  to 85  operating tem-perature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC).
TYPICAL PERFORMANCE CHARACTERISTICS  CT, Oscillator Timing Capacitor (nF)
t O N -O F F , O u t p u t  S w i t c h  O N -O F F  T i m e  (µS )
Fig. 1  Output Switch ON-OFF Time vs. Oscillator
Timing Capacitor
Fig. 2  Standby Supply Current vs. Supply Voltage
VCC, Supply Voltage (V)
I C C , S u p p l y  C u r r e n
t  (m A )
05
101520
2530
2
V F B , T h r e s h o l d  V o l t a g e  (V )
Temperature (°C)
Fig. 3  V FB , Threshold Voltage vs. Temperature
1.2
1.22
1.24
1.26
1.28
1.3
V C C -V I S  T h r e s h o l d  V o l t a g e  (m V )
T emperature (°C)
Fig. 4  I S Threshold Voltage vs. T emperature
Fig. 5  Emmiter Follower Configuration Output Switch
bootstrapped
Saturation Voltage vs. Emmiter Current
I E , Emitter Current (A)
V C E (S A T ), S a t u r a t i o n
V o l t a g e  (V )
0.51  1.5
Fig. 6  Common Emitter Configuration Output Switch
Saturation Voltage vs. Collector Current
I C , Collector Current (A)
V C E (S A T ), S a t u r a t i o n  V o l t a g e  (V )

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