DC-to-DC Converter Control Circuits RT34063A Series monolithic co
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RT34063A
DC-to-DC Converter Control Circuits
RT34063A Series monolithic control circuit containing primary functions required DC-toDC converters. These devices consist internal temperature compensated reference, comparator, controlled duty cycle oscillator with active current limit circuit, driver high current output switch. This series specially designed incorporated Step-down Step-up Voltage-inverting applications with minimum number external components.
Features
Operation from 3.0V Input Standby Current Current Limiting Internal Switch Current 1.5A Output Voltage Adjustable Frequency Operation 100KHz Precision Reference
Applications
Saver Cellular Phones DC-DC Converter Module
Configurations
Part Number RT34063ACN (Plastic DIP-8) Configurations
VIEW
Ordering Information
RT34063A Package type DIP-8 SOP-8 Operating temperature range Commercial standard
DRIVER COMP
RT34063ACS (Plastic SOP-8)
Marking Information
Part Number RT34063ACN RT34063ACS Marking RT34063ACN RT34063ACS
DS34063A-07 September 2002
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RT34063A
Absolute Maximum Ratings
Power Supply Voltage Feedback Input Voltage Range Switch Collector Voltage Switch Emitter Voltage Switch Collector Emitter Voltage Driver Collector Voltage Driver Collector Current (see Note Switch Current Power Dissipation, 25°C DIP-8 SOP-8 Package Thermal Resistance DIP-8, SOP-8, Operating Junction Temperature Storage Temperature Range Note: Maximum package power dissipation limits must observed. -0.3 +30V 100mA 1.5A 1.25W 0.625W 100°C/W 160°C/W +125°C +150°C
Electrical Characteristics
(VCC 25°C, unless otherwise specified) Parameter Oscillator Frequency Charge Current Discharge Current Discharge Charge Current Ratio Current Limit Sense Voltage Output Switch Saturation Voltage, Darlington Connection Saturation Voltage, Darlington Connection Current Gain Collector Off-state Current Comparator Threshold Voltage Threshold Voltage Line Regulation Input Bias Current Total Device Supply Current 5.0V 30V, 1.0nF, Pin7 VCC, VPIN5 VTH, Pin2 GND, Remaining pins open -3.0 IBIAS 3.0V 1.225 1.25 1.275 -1.4 -400 1.0A, Pins1, connected 1.0A, RPIN8 VCC, Forced 1.0A, 5.0V -1.0 0.45 0.01 -100 VLIMIT ICHG VPIN5 1.0nF 5.0V ICHG IDISCHG IDISCHG 5.0V Symbol Test Conditions Units
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DS34063A-07 September 2002
RT34063A
Function Block Diagram
DRIVER Oscillator Comparator COMP 1.25V Reference Regulator
Description
Name COMP DRIVER Function 1.5A Switch Collector Darlington Switch Emitter Oscillator Timing Capacitor Power Feedback Comparator Inverting Input Power Supply Input Highside Current Sense Input VCC-VIPK 330mV Driver Collector
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RT34063A
Typical Operating Characteristics
Output Switch On-Off Time Oscillator Timing Capacitor
1000
Timing Capacitor Waveform
TOn-Off, Output Switch On-Off Time
5.0V 25°C
VOUT 5.0V Open 1.0nF 25°C
TOFF
0.01
Oscilator Timing Capacitor (nF)
Emitter Follower Configuration Output Saturation Voltage Emiter Current
Common Emiter Configuration Output Switch Saturation Voltage Collector Current
VCE, Saturation Voltage
VCE, Saturation Voltage
5.0V 1,7,8 25°C
5.0V 2,3,5 25°C
Emitter Current
ICC, Collector Current
Standyby Supply Current Supply Voltage
Current Limit Sense Voltage (mV)
Current Limit Sense Voltage Temp.
ICC, Supply Current (mA)
5.0V 2.0V 25°C
5.0V ICHARGE IDISCHARGE
Supply Voltage
Temperature
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RT34063A
VCE(Q1) Curve
2000
2000
VCE(Q1) Curve
34mA
1600
-20°C
1600
-10°C
34mA
15mA
(mA)
(mA)
1200
1200
15mA
2.4mA
2.4mA
(mV)
(mV)
VCE(Q1) Curve
2000
2000
VCE(Q1) Curve
34mA
1600
1600
25°C
34mA
(mA)
(mA)
1200
15mA
1200
15mA
2.4mA 2.4mA
(mV)
(mV)
VCE(Q1) Curve
1800
70°C
1500 1200
34mA
15mA
(mA)
2.4mA
(mV)
DS34063A-07 September 2002
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RT34063A
Typical Application Circuit
170µH 0.22 100µF 2.2k 330µF Comp. 1.25V Optional Filter 1.0µH VOUT 28V/175mA VOUT 100µF 1500pF 1N5819
Fig.1 Step-up Converter
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DS34063A-07 September 2002
RT34063A
VOUT
Fig.2a External Switch
VOUT
Constant
Fig.2b External Saturated Switch (See Note)
Fig.2 External Current Boost Connections Peak Greater than 1.5A
Note: output switch driven into hard saturation (non-Darlington configuration) switch currents 300mA) high driver currents 30mA), take 2.0µs come saturation. This condition will shorten time frequencies 30KHz, magnified high temperature. This condition does occur with Darlington configuration, since output switch cannot saturate. nonDarlington configuration used, following output drive condition recommended.
DS34063A-07 September 2002
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RT34063A
0.33 100µF 1.2k 3.6K
1N5819
Comp. 1.25V 470pF
220µH
Optional Filter 1.0µH 470µF VOUT 5.0V/500mA VOUT 100µF
Fig.3 Step-down Converter
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DS34063A-07 September 2002
RT34063A
VOUT
Fig.4a External Switch
VOUT
Fig.4b External Saturated Switch
Fig.4 External Current Boost Connections Peak Greater than 1.5A
DS34063A-07 September 2002
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RT34063A
0.24 4.5V 6.0V 100µF 8.2k
88µH Comp. 1.25V 1500pF Optional Filter 1.0µH 1000µF VOUT -12V/100mA VOUT 100µF 1N5819
Fig.5 Voltage Inverting Converter
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RT34063A
VOUT
Fig.6a External Switch
VOUT
Fig.6b External Saturated Switch
Fig.6 External Current Boost Connections Peak Greater than 1.5A
DS34063A-07 September 2002
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RT34063A
Design Formula Table
Calculation ton/toff (ton toff) toff (SWITCH)
(min)
Step-up
VOUT (MIN) (MIN) VSAT
toff toff
Step-down
Voltage-Inverting
VOUT (MIN) VSAT VOUT
toff toff
toff toff
(ton toff toff
10-5
IOUT (MAX) toff
(ton toff toff
10-5
IOUT (MAX)
(ton toff toff
10-5
IOUT(MAX) toff
0.3/Ipk (SWITCH)
(VIN(MIN) VSAT Ipk(SWITCH) ton(MAX
IOUT Vripple (pp)
0.3/Ipk (SWITCH)
(VIN(MIN) VSAT Ipk(SWITCH ton(MAX
Ipk(SWITCH toff Vripple(pp)
0.3/Ipk (SWITCH)
(VIN(MIN) VSAT Ipk(SWITCH ton(MAX
IOUT Vripple (pp)
VSAT VOUT IOUT Vripple(pp)
Saturation voltage output switch. Forward voltage drop output rectifier.
following power supply characteristics must chosen: Nominal input voltage.
Desired output voltage VOUT 1.25 Desired output current. Minimum desired output switching frequency selected values
Desired peak-to-peak output ripple voltage. practice, calculated capacitor value needs increased equivalent series resistance board layout. ripple voltage should kept value since directly affects line load regulation.
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DS34063A-07 September 2002
RT34063A
Package Information
Dimensions Millimeters Symbol 9.068 6.198 -0.356 1.397 2.337 3.048 7.366 0.381 9.627 6.604 4.318 0.559 1.651 2.743 3.556 8.255
Dimensions Inches 0.357 0.244 -0.014 0.055 0.092 0.120 0.290 0.015 0.379 0.260 0.170 0.022 0.065 0.108 0.140 0.325
8-Lead Plastic Package
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RT34063A
Dimensions Millimeters Symbol 4.801 3.810 1.346 0.330 1.194 0.178 0.102 5.791 0.406 5.004 3.988 1.753 0.508 1.346 0.254 0.254 6.198 1.270
Dimensions Inches 0.189 0.150 0.053 0.013 0.047 0.007 0.004 0.228 0.016 0.197 0.157 0.069 0.020 0.053 0.010 0.010 0.244 0.050
8-Lead Plastic Package
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DS34063A-07 September 2002
RT34063A
DS34063A-07 September 2002
www.richtek.com
RT34063A
RICHTEK TECHNOLOGY CORP.
Headquarter
Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
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DS34063A-07 September 2002
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