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UTC 3563
LINEAR INTEGRATED CIRCUIT
HIGH-EFFICIENCY DC/DC CONVERTER
DESCRIPTION
The UTC 3563 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 UTC 3563 can deliver 1.5A continuous current without requiring a heat sink.
SOP-8
DIP-8
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. *Saver for cellular phones. *Step-Down DC-DC converter module.
PIN CONFIGURATION
DC
1
8
BOOST
DE
2
7
IS
CF
3
6
VCC
GND
4
5
FB
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UNISONIC TECHNOLOGIES CO., LTD.
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UTC 3563
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
PIN
1 2 3 4
SYMBOL
DC DE CF GND
DESCRIPTION
2A switch collector Darlington switch emitter Oscillator timing capacitor Power ground
PIN
5 6 7 8
SYMBOL
FB VCC IS BOOST
DESCRIPTION
Feedback comparator inverting input Power supply input Highside current sense input (VCC-VIS=300mV) Bootstrapped driver collector
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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UTC 3563
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
VCC Vi VC(switch) VE(switch) VCE(switch) VC(driver) ISW
ABSOLUTE MAXIMUM RATINGS (Ta=25C)
VALUE
30 -0.3~+30 30 30 30 30 2 1000 625 100 160 125 0~+70 -65~+150
UNIT
V V V V V V A mW mW C/W C/W C C C
Supply Voltage Comparator input voltage range Switch collector voltage Switch emitter Voltage Switch collector to emitter voltage Driver collector Voltage Switch current Power dissipation (Ta=25C) DIP-8 SOP-8 Thermal Resistance DIP-8 SOP-8 Operating junction temperature Operating ambient temperature range Storage temperature range
Tj Ta Tstg
ELECTRICAL CHARACTERISTICS (VCC=5.0V, Ta=25C, unless otherwise specified)
PARAMETER SYMBOL
ICHG IDISCHG Vosc IDISCHG / ICHG VCC -VIS VCE(SAT) VCE(SAT) hFE IC(OFF) VFB REGLINE IIB ICC
TEST CONDITIONS
5VVCC30V 5VVCC30V PIN 3 VIS=VCC ICHG=IDISCHG IDE=1.0A, VBOOST=VDC=VCC IDC=1.0A, IBOOST=50mA, (Forced 20) ISC=1.0A VCE=5.0V VCE=30V Ta=25C 0CTa70C 3VVCC30V VIN=0V VIS=VCC, PIN 5>VFB, 5.0VVCC30V, CT=1nF, PIN 2=GND, Remaining pins open
MIN
10 100
TYP.
25 150 0.6 6.0 300 1.5 0.4
MAX
40 200
UNIT
A A V
Oscillator
Charging Current Discharging Current Voltage Swing Discharge to Charge Current Ratio Current limit Sense Voltage
250
350 1.8 0.7
mV V V
Output Switch
Saturation Voltage, Emitter Follower Connection Saturation Voltage DC Current Gain Collector Off State Current
35
120 10 nA 1.275 1.290 0.3 1.0 3.0 V V mV/V A mA
Comparator
Threshold Voltage Threshold voltage Line Regulation Input Bias Current Supply Current 1.225 1.210 1.250 0.1 0.4 1.6
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UNISONIC TECHNOLOGIES CO., LTD.
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UTC 3563
TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
EFFICIENCY vs OUTPUT CURRENT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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UTC 3563
LINEAR INTEGRATED CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
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UNISONIC TECHNOLOGIES CO., LTD.
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UTC 3563
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION DESIGN FORMULA TABLE
CALCULATION tON/tOFF (tON+tOFF)MAX CT IC(SWITCH) RS L(MIN) STEP-DOWN VOUT+VF VIN(MIN)-VSAT-VOUT 1/FMIN 4x10-5tON 2IOUT(MAX) 0.3/IC(SWITCH) VIN(MIN)-VSAT-VOUT ( ) tON(MAX) IC(SWITCH) IC(SWITCH) (tON+tOFF) 8VRIPPLE(P-P) STEP-UP VOUT+VF-VIN(MIN) VIN(MIN)-VSAT 1/FMIN 4x10-5tON tON + tOFF 2IOUT(MAX)( tOFF 0.3/IC(SWITCH) VIN(MIN) - VSAT ( ) tON(MAX) IC(SWITCH) IOUT tON VRIPPLE(P-P)
)
Co
VSAT : Saturation voltage of the output switch VF : Forward voltage of the ringback rectifier The following power supply characteristics must be chosen: VIN : Norminal input voltage VOUT : Desired output voltage, VOUT=1.25(1+RB/RA) IOUT : Desired output current FMIN : 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.
APPLICATION EXAMPLES
Fig. 1 Simplified Battery Charge Circuit for Ni-Cd/Ni-MH Battery
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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UTC 3563
LINEAR INTEGRATED CIRCUIT
Fig.2 Battery Charge Circuit for Fluctuating Charging Current Applications
Fig. 3 Step-Down Converter
Line regulation: 40mV (VIN=10V~20V, @IO=1A) Load regulation: 20mV (VIN=15V, @IO=100mA~1A) Short circuit current: 1.3A (VIN=15V, @RL=0.1)
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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UTC 3563
LINEAR INTEGRATED CIRCUIT
Fig. 4 Step-Down Converter with External 5V Bootstrap
Fig. 5 Step-Up Converter
Line regulation: 100mV (VIN=8V~16V, @Io=200mA) Load regulation: 40mV (VIN=12V, @IO=80mA~200mA)
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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UTC 3563
LINEAR INTEGRATED CIRCUIT
Fig. 6 Step-Up Converter with External NPN Switch
Fig. 7 Inverting Converter
Line regulation: 20mV (VIN=4.5V~6V, @IO=100mA) Load regulation: 100mV (VIN=5V, @IO=10mA~100mA)
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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QW-R103-013,B
UTC 3563
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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QW-R103-013,B

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