UTC-IC UTC3563

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.
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.
SOP-8
DIP-8
APPLICATIONS
*Constant current source for battery chargers.
*Saver for cellular phones.
*Step-Down DC-DC converter module.
PIN CONFIGURATION
UTC
DC
1
8
BOOST
DE
2
7
IS
CF
3
6
VCC
GND
4
5
FB
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UTC 3563
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
PIN
SYMBOL
1
DC
2A switch collector
DESCRIPTION
PIN
SYMBOL
5
FB
2
DE
3
CF
4
GND
DESCRIPTION
Darlington switch emitter
6
VCC
Oscillator timing capacitor
7
IS
Highside current sense input
Power ground
8
BOOST
Bootstrapped driver collector
Feedback comparator inverting input
Power supply input
(VCC-VIS=300mV)
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UTC 3563
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
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=25°C)
DIP-8
SOP-8
Thermal Resistance
DIP-8
SOP-8
Operating junction temperature
Operating ambient temperature range
Storage temperature range
SYMBOL
VALUE
UNIT
VCC
Vi
VC(switch)
VE(switch)
VCE(switch)
VC(driver)
ISW
30
-0.3~+30
30
30
30
30
2
V
V
V
V
V
V
A
1000
625
mW
mW
100
160
125
0~+70
-65~+150
°C/W
°C/W
°C
°C
°C
Tj
Ta
Tstg
ELECTRICAL CHARACTERISTICS (VCC=5.0V, Ta=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP.
MAX
UNIT
ICHG
IDISCHG
Vosc
IDISCHG /
ICHG
VCC -VIS
5V≤VCC≤30V
5V≤VCC≤30V
PIN 3
VIS=VCC
10
100
25
150
0.6
6.0
40
200
µA
µA
V
ICHG=IDISCHG
250
300
350
mV
VCE(SAT)
IDE=1.0A,
VBOOST=VDC=VCC
IDC=1.0A, IBOOST=50mA,
(Forced β≈20)
ISC=1.0A
VCE=5.0V
VCE=30V
1.5
1.8
V
0.4
0.7
V
Oscillator
Charging Current
Discharging Current
Voltage Swing
Discharge to Charge Current Ratio
Current limit Sense Voltage
Output Switch
Saturation Voltage,
Emitter Follower Connection
Saturation Voltage
DC Current Gain
VCE(SAT)
hFE
Collector Off State Current
IC(OFF)
35
120
10
nA
Comparator
Threshold Voltage
VFB
Threshold voltage Line Regulation
Input Bias Current
Supply Current
UTC
REGLINE
IIB
ICC
Ta=25°C
0°C≤Ta≤70°C
3V≤VCC≤30V
VIN=0V
VIS=VCC, PIN 5>VFB,
5.0V≤VCC≤30V, CT=1nF,
PIN 2=GND, Remaining
pins open
1.225
1.210
1.250
0.1
0.4
1.6
1.275
1.290
0.3
1.0
3.0
UNISONIC TECHNOLOGIES CO., LTD.
V
V
mV/V
µA
mA
3
QW-R103-013,B
UTC 3563
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
TYPICAL APPLICATION CIRCUIT
EFFICIENCY vs OUTPUT CURRENT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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QW-R103-013,B
UTC 3563
LINEAR INTEGRATED CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
UTC
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UTC 3563
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION
DESIGN FORMULA TABLE
CALCULATION
tON/tOFF
STEP-DOWN
VOUT+VF
VIN(MIN)-VSAT-VOUT
(tON+tOFF)MAX
1/FMIN
CT
4x10-5tON
IC(SWITCH)
2IOUT(MAX)
RS
L(MIN)
0.3/IC(SWITCH)
VIN(MIN)-VSAT-VOUT
(
) tON(MAX)
IC(SWITCH)
IC(SWITCH) (tON+tOFF)
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
Co
8VRIPPLE(P-P)
VRIPPLE(P-P)
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
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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=0.1Ω)
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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)
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QW-R103-013,B
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)
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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.
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QW-R103-013,B