AMS34063 DC-TO-DC CONVERTER CONTROL CIRCUIT APPLICATIONS
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Wide Input Voltage Operating Range from 2.5V Standby Current Current Limiting Output Switch Current 1.5A Output Voltage Adjustable from 1.25 Frequency Operation 100kHz
AMS34063
DC-TO-DC CONVERTER CONTROL CIRCUIT
APPLICATIONS
Step-Up Converter Step-Down Converter Voltage Inverting Application
GENERAL DESCRIPTION
AMS34063 series control circuit containing basic functions required DC-to-DC converters. device consists internal temperature compensated reference, comparator, controlled duty cycle oscillator with active current limit circuit, driver high current output switch. Designed specifically incorporated Step-Up, Step-Down Voltage -Inverting applications, AMS34063 requires minimum number external components. AMS34063 available 8-lead plastic SOIC 8-lead plastic packages.
ORDERING INFORMATION
PACKAGE TYPE LEAD PDIP AMS34063P LEAD SOIC AMS34063S OPER. TEMP RANGE -40°C +85°C
CONNECTIONS LEAD SOIC/ LEAD PDIP
SWITCH COLLECTOR SWITCH EMITTER TIMING CAPACITOR
DRIVER COLLECTOR SENSE
COMPARATOR INVERTING INPUT
View
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS34063
ABSOLUTE MAXIMUM RATINGS (Note
Power Supply Voltage, Comparator Input Voltage Range, -0.3V +40V Switch Collector Voltage, VC(switch) Switch Emitter Voltage, VE(switch) Switch Collector Emitter Voltage, VCE(switch) Driver Collector Voltage, VC(driver) Switch Current, Power Dissipation Maximum Junction Temperature Storage Temperature 1.5A (Note +125°C -65°C +150°C
ELECTRICAL CHARACTERISTICS
PARAMETER
Oscillator Charging Current Discharge Current Voltage Swing Discharge Charge Current Ratio Current Limit Sense Voltage Output Switch (Note Saturation Voltage, Darlington Connection Saturation Voltage Current Gain Collector Off-State Current Comparator Threshold Voltage Threshold Voltage Line Regulation Input Bias Current Total Device 3.0V
Electrical Characteristics 5.0V, -40°C +85°C, unless otherwise noted. CONDITIONS Min.
5.0V 40V, 25°C 5.0V 40V, 25°C 25°C IPK(sense) VCC, 25°C ICHG IDISCHG, 25°C
AMS34063 Typ.
Units Max.
VP-P
1.0A, VC(driver) VC(switch) 1.0A, IC(driver) 50mA, (Forced 1.0A, 5.0V, 25°C 40V, 25°C
0.45
1.18
1.25 0.04
1.32
mV/V
5.0V 40V, IPK(sense) 0.001µF, Vth, Gnd, Remaining pins open Note Absolute Maximum Ratings limits beyond which damage device occur. guaranteed performance limits associated test conditions, Electrical Characteristics tables. Note minimize power dissipation, duty cycle pulse testing used. Note Power dissipation 25°C equal 1.0W lead package 625mW SO-8 package. operation temperatures above 25°C derate power dissipation 10mW/°C. Supply Current
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS34063
FUNCTIONAL BLOCK DIAGRAM
DRIVE COLLECTOR SENSE COMP. COMPARATOR INVERTING INPUT 1.25V SWITCH EMITTER SWITCH COLLECTOR
TIMING CAPACITOR
TYPICAL PERFORMANCE CHARACTERISTICS
Output Switch On-Off Time Oscillator Timing Capacitor OUTPUT SWITCH ON-OFF TIME (µs) 1000 SUPPLY CURRENT (mA)
5.0V IPK(sense)
Standby Supply Current Supply Voltage
0.001µF IPK(sense)
OSCILLATOR TIMING CAPACITOR
SUPPLY VOLTAGE
Emitter-Follower Configuration Output Switch Saturation Voltage Emitter Current SATURATION VOLTAGE EMITTER CURRENT SATURATION VOLTAGE
5.0V Pins 1,7,8
Common-Emitter Configuration Output Switch Saturation Voltage Collector Current COLLECTOR CURRENT
5.0V 2,3,5 Darlington Connection
Forced Beta
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS34063
TYPICAL APPLICATIONS
Step-Down Converter
COMP. 1.25V
0.33
1N5822 220µH
VOUT 5.0V/500mA
Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency
Conditions 25V, 500mA 25V, 500mA 25V, 500mA 25V, 25V, 500mA 15mV 5.0mV
Results
mVP-P 2.3A 84.7%
External Current Boost Connections Peak Greater than 1.5A
External Switch
External Saturated Switch
VOUT
VOUT
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS34063
TYPICAL APPLICATIONS (Continued)
Step-Up Converter
170µH
COMP. 1.25V
0.22
1500
1N5819
VOUT 28V/175mA
Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency
Conditions 16V, 12V, 12V, 12V, 12V,
Results
mVP-P 2.3A 84.7%
External Current Boost Connections Peak Greater than 1.5A
External Switch
External Saturated Switch
VOUT
VOUT
constant
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS34063
APPLICATION HINTS Design Formula Table
Calculation
tOFF
Step-Down
VOUT VIN(MIN) VSAT VOUT fMIN
Step-Up
VOUT VIN(MIN) VIN(MIN) VSAT fMIN
(tON tOFF) IPK(switch) L(MIN)
10-5tON 2IOUT(MAX)
0.33/IPK(switch) VIN(MIN) VSAT VOUT tON(MAX IPK(switch) IPK(switch) (tON tOFF) 8Vripple(P
10-5tON
tOFF 2IOUT tOFF 0.33/IPK(switch) VIN(MIN) VSAT tON(MAX IPK(switch) IOUT Vripple
VSAT Saturation voltage output switch. Forward voltage drop ringback rectifier. Notes following power supply characteristics must chosen: Nominal input voltage. this voltage constant, then VIN(MAX) step-down VIN(MIN) step-up converter. VOUT Desired output voltage, VOUT 1.25 IOUT Desired output current. fMIN Minimum desired output switching frequency selected values Vripple(P-P) Desired peak-to-peak output ripple voltage. practice, calculated value will need increased capacitor's equivalent series resistance board layout. ripple voltage should kept value since will directly effect line load regulation.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS34063
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
LEAD SOIC PLASTIC PACKAGE
0.189-0.197* (4.801-5.004)
0.228-0.244 (5.791-6.197)
0.150-0.157** (3.810-3.988)
0.053-0.069 (1.346-1.752) 0.004-0.010 (0.101-0.254) 0.008-0.010 (0.203-0.254)
0.010-0.020 (0.254-0.508) 0°-8°
0.014-0.019 (0.355-0.483)
0.050 (1.270)
0.016-0.050 (0.406-1.270)
(SO-8 DRW# 042293
*DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
LEAD PLASTIC PACKAGE
0.400* (10.160)
0.255±0.015* (6.477±0.381)
0.045-0.065 (1.143-1.651)
0.130±0.005 (3.302±0.127)
0.300-0.325 (7.620-8.255)
0.065 (1.651) 0.005 (0.127) 0.100±0.010 (2.540±0.254) 0.125 (3.175) 0.018±0.003 (0.457±0.076) 0.015 (0.380)
0.009-0.015 (0.229-0.381) 0.325 +0.025 -0.015 (8.255 +0.635 -0.381
PDIP DRW# 042294
*DIMENSIONS INCLUDE MOLD FLASH PROTUSIONS. MOLD FLASH PROTUSIONS SHALL EXCEED 0.010" (0.254mm)
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
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