AS34063
1.5A Universal DC/DC Converter
FEATURES
GENERAL DESCRIPTION
Operation from 3.0V to 36V
The AS34063 is a monolithic switching regulator
Low Standby Current
control circuit containing the primary functions
Current Limiting
required for DC-to-DC converters. This device
Output Switch Current up to 1.5A
consists of an internal temperature compensated
Output Voltage Adjustable
reference,
Operation Frequency up to 180KHz
oscillator with an active current limit circuit, driver
Precision 2% Reference
and high current output switch. This device is
Package SOP-8L
specifically designed to be used in Step-Down and
comparator,
controlled
duty
cycle
Step-Up and Voltage-Inverting applications with a
minimum number of external components.
APPLICATIONS
Battery Chargers
ADSL Modems
NICs/Switches/Hubs
Negative Voltage Power Supplies
PIN CONNECTIONS
Top View
1
SWC
DRC
8
2
SWE
IPK
7
3
TC
VCC
6
4
GND
FB
5
PIN NUMBER
PIN NAME
FUNCTION
1
SWC
Internal Switch Transistor Collector
2
SWE
Internal Switch Transistor Emitter
3
TC
Timing Capacitor to Control the Switching Frequency
4
GND
Ground Pin for All Internal Circuits
5
FB
Inverting Input Pin for Internal Comparator
6
VCC
Supply Voltage
7
IPK
8
DRC
AS34063 Rev.1.0
5/20/2008
Peak Current Sense Input by Monitoring the Voltage Drop Across an
External Isense Resistor to Limit the Peak Current Through the Switch
Voltage Driver Collector
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1
AS34063
1.5A Universal DC/DC Converter
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note1)
Power Supply Voltage …………………………..…40V
Comparator Input Voltage………………. -0.3V to 40V
Switch Collector Voltage ………….……….……… 40V
Switch Emitter Voltage ………….………………… 40V
Switch Current…………………………………..….1.5A
Power Dissipation(Ta=25℃) …………..…..….625mW
Operating Junction Temperature ……………….150℃
Storage Temperature Range ….......... -65℃ to 150℃
ESD(Human Body Model) ………………….......…2KV
TOP VIEW
1
SWC
DRC
8
2
SWE
IPK
7
3
TC
VCC
6
4
GND
FB
5
Note 1: Absolute Maximum Ratings are those values beyond
which the life of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and
power dissipation PD according to the following formula:
PART NUMBER
PACKAGE
AS34063EBT
SOP-8L
MARKING
AS34063
YYWWJ
TJ = TA + PD x ӨJA.( ӨJA=160℃/W)
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
Supply Voltage
Vcc
Ambient Temperature
Ta
MIN
TYP
MAX
UNITS
3
36
V
-40
85
℃
ELECTRICAL CHARACTERISTICS
VCC = 5.0V, TA =-40~ 85°C Unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
OSCILLATOR
Frequency
VPIN5=0V, CT=1.0nF, TA=25°C
30
38
45
KHz
Charge Current
VCC=5.0V to 36V, TA=25℃
30
38
45
μA
Discharge Current
VCC=5.0V to 36V, TA=25℃
180
240
290
μA
Pin7 to Vcc, TA=25℃
5.2
6.5
7.5
-
ICHG=IDISCHG, TA=25℃
250
300
350
mV
-
1.0
1.3
V
-
0.45
0.7
V
50
75
-
-
0.01
100
Discharge to Charge
Current Ratio
Current Limit Sense
Voltage
OUTPUT SWITCH(Note3)
Saturation Voltage,
Darlington Connection
Saturation Voltage(Note4)
ISW=1.0A, Pins 1,8 connected
ISW=1.0A, RPin8=82ohm to Vcc, Forced
β=20
DC Current Gain
ISW=1.0A, VCE=5.0V
Collector Off-State Current
VCE=36V, TA=25℃
AS34063 Rev.1.0
5/20/2008
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μA
2
AS34063
1.5A Universal DC/DC Converter
ELECTRICAL CHARACTERISTICS(Continued)
VCC = 5.0V, TA =-40~ 85°C Unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
1.275
V
COMPARATOR
Threshold Voltage
Threshold Voltage Line
Regulation
Input Bias Current
TA =25°C
1.225
TA =-40~ 85°C
1.210
1.250
1.29
VCC=3.0V to 36V
-
1.4
5
mV
VIN=0V
-
-20
-400
nA
-
-
4
mA
Total Device
VCC=5V to 36V, CT=1.0nF,
Supply Current
Pin7=VCC, VPin5＞VTH,
Note 3: Low duty cycle pulse technique are used during test to maintain junction temperature as close to ambient temperature as
possible.
Note 4: If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (≤ 300mA) and high
driver currents (≥ 30mA), it may take up to 2.0us for it to come out of saturation. This condition will shorten the off time at
frequencies 30KHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since
the output switch cannot saturate. If a non-Darlington configuration is used, the following output drive condition is recommended:
Forced β of output switch
Ic output
------------------------- ≥10
Ic driver -7.0mA
The 100ohm resistor in the emitter of the driver device requires about 7.0mA before the output switch conducts.
FUNCTIONAL BLOCK DIAGRAM
Driver
Collector
8
B
A
S
1
Switch
Collector
2
Switch
Emitter
3
Timing
Capacitor
Q
R
Ipk Sense
7
Ipk
OSC
VCC
Ct
6
+
1.25V
Reference
Regulator
Comparator
Inverting
Input
AS34063 Rev.1.0
5/20/2008
5
4 GND
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AS34063
1.5A Universal DC/DC Converter
TYPICAL PERFORMANCE CHARACTERISTICS
AS34063 Rev.1.0
5/20/2008
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AS34063
1.5A Universal DC/DC Converter
TYPICAL PERFORMANCE CHARACTERISTICS(Continued)
AS34063 Rev.1.0
5/20/2008
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AS34063
1.5A Universal DC/DC Converter
TYPICAL APPLICATIONS
Step-Up Converter
Note: This is a typical step-up converter configuration. In the steady state, if the resistor divider voltage at pin 5 is greater than the
voltage in the non-inverting input, which is 1.25V determined by the internal reference, the output of the comparator will go low. At
the next swithching period, the output switch will not conduct and the output voltage will eventually drop below its nominal voltage
until the divider voltage at pin 5 is lower than 1.25V. Then the output of the comparator will go high, the output switch will be
allowed to conduct. Since Vpin5 = VOUT * R2/(R1+R2) = 1.25(V), the output voltage can be decided by VOUT = 1.25 * (R1+R2)/R2
(V).
AS34063 Rev.1.0
5/20/2008
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© 2008 ANISEM All Rights Reserved.
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AS34063
1.5A Universal DC/DC Converter
TYPICAL APPLICATIONS(Continued) Step-Down Converter
Note : This is a typical step-down converter configuration. The working process in the steady state is similar to step-up converter,
Vpin5 = VOUT * R2/(R1+R2) = 1.25 (V), the output voltage can be decided by VOUT = 1.25 * (R1+R2)/R2 (V).
AS34063 Rev.1.0
5/20/2008
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© 2008 ANISEM All Rights Reserved.
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AS34063
1.5A Universal DC/DC Converter
TYPICAL APPLICATIONS(Continued) Voltage-Inverting Converter
Note : This is a typical inverting converter configuration. The working process in the steady state is similar to step-up converter,
the difference in this situation is that the voltage at the non-inverting pin of the comparator is equal to 1.25V+VOUT, then Vpin5 =
VOUT * R2/(R1+R2) = 1.25V+VOUT, so the output voltage can be decided by VOUT = -1.25 * (R1+R2)/R1 (V).
AS34063 Rev.1.0
5/20/2008
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© 2008 ANISEM All Rights Reserved.
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AS34063
1.5A Universal DC/DC Converter
DESIGN FORMULA TABLE
AS34063 Rev.1.0
5/20/2008
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© 2008 ANISEM All Rights Reserved.
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AS34063
1.5A Universal DC/DC Converter
PACKAGE DESCRIPTION
Units: mm
Package
8-Lead Plastic SOP-8L
AS34063 Rev.1.0
5/20/2008
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© 2008 ANISEM All Rights Reserved.
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AS34063
1.5A Universal DC/DC Converter
© ANISEM Semiconductor Co., Ltd
ANISEM assume responsibility for use of any circuitry other than circuitry entirely embodied in an ANISEM product. No circuit patent licenses,
copyrights, mask work rights, or other intellectual property rights are implied. ANISEM reserves the right to make changes to their products or
specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to
verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of
sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.
ANISEM warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ANISEM’s
standard warranty. Testing and other quality control techniques are utilized to the extent ANISEM deems necessary to support this warranty.
Specific testing of all parameters of each device is not necessarily performed.
AS34063 Rev.1.0
5/20/2008
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© 2008 ANISEM All Rights Reserved.
11