www.addmtek.com
Copyright © 2006 ADDtek Corp. 1 DD014_E -- JUNE 2006
AMC34063A
DC–DC CONVERTER
CONTROL CIRCUITS
DESCRIPTION FEATURES
The AMC34063A is designed for the applications
which require DC - DC converters. It can be operated in a
wide input range from 3.0V to 40V and has the controlled
duty cycle oscillator, driver and high current output switch.
Also, With the internal temperature compensation circuit, the
AMC34063A provides an internally trimmed precision 2%
reference voltage of 1.25V. These features make the
AMC34063A suitable for step-up, step-down and
voltage–inverting applications.
Wide Input Operating Range: 3.0V to 40V
Output Switch Current up to 1.5A
100KHz operational Frequency
Low Standby Current
Internally trimmed 2% 1.25V Reference Voltage
Adjustable O utpu t Voltage
Available in 8 Pin Plastic DIP and 8 Pin S.O
Packages
Direct pin-to-pin replacement for industrial
product MC34063A.
APPLICATIONS PACKAGE PIN OUT
Chargers
Adaptors
Mother Board
Scanner
SE
Cap
GND
SC 1
2
3
4
VCC
ISEN
8
7
6
5
DrC
M PACKAGE
(TOP VIEW)
VFB-
SE
Cap
GND
SC 1
2
3
4
VCC
ISEN
8
7
6
5
DrC
DM PACKAGE
(TOP VIEW)
VFB
ORDER INFORMATION
Plastic DIP Plastic SO-8
TA (°C) M 8-pin DM 8-pin
AMC34063AM (SnPb) AMC34063ADM (SnPb)
0 to 70 AMC34063AMF (Lead Free) AMC34063ADMF (Lead Free)
Note: All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e. AMC34063ADMT).
The letter “F” is marked for Lead Free process.
AMC34063A
Copyright © 2006 ADDtek Corp. 2 DD014_E -- JUNE 2006
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage (VCC) ………………………………………………………………………………..…40V
Operating Junction temperature (M, DM Packages) ………………………………................................ 150 °C
Storage Temperature Range …………………………………………………………………...…. -65°C to 150°C
Lead temperature (Soldering, 10 seconds) …………………………………………………………..………300°C
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into,
negative out of the specified terminal.
THERMAL DATA
M PACKAGE:
Power dissipation (PD), TA = 25 °C 1.31W
Thermal Resistance-Junction to Ambient, θJA 95°C /W
DM PACKAGE:
Power dissipation (PD), TA = 25 °C 757mW
Thermal Resistance-Junction to Ambient, θJA 165°C /W
BLOCK DIAGRAM
Oscillator
4
3
Gnd
Cap
1.25V
Reference
C
T
2
1
SE
SC
100
Q2
Q1 Q
Isen
5
6
V
FB
V
CC
7
8
R
S
SEN
I
DrC
PIN ASSIGNMENT DESC RIPTIO NS
Pin 1 : SC - Switch Collector Pin 8 : DrC - Driver Collector
Pin 2 : SE - Switch Emitter Pin 7 : ISEN - I Peak Sense
Pin 3 : Cap - Oscillator Timing Capacitor Pin 6 : VCC - Power Supply
Pin 4 : GND - Ground Pin 5 : VFB - Comparator inverting input
AMC34063A
Copyright © 2006 ADDtek Corp. 3 DD014_E -- JUNE 2006
RECOMMENDED OPERATING CONDITIONS
Recommended Operating Conditions
Parameter Symbol Min. Typ. Max. Units
Comparator Input Voltage VFB -0.3 to + 40 V
Switch Collector Voltage VC(switch) 40 V
Switch Emitter Voltage (VPin1=40V) VE(switch) 40 V
Switch Collector to Emitter Voltage VCE(switch) 40 V
Driver Collector Voltage VC(driver) 40 V
Driver Collector Current (Note 1) IC(driver) 100 mA
Switch Current ISW 1.5 A
Timing Capacitor (connected to Cap pin) CT 1 nF
Operating Ambient Temperature Range TA 0 to +70 °C
Note 1: Maximum package power dissipation limits must be observed.
ELECTRICAL CHARACTERISTICS
VCC=5.0 V, TA=0°C to 70°C, unless otherwise specified.
AMC34063A
Parameter Symbol Test Conditions Min. Typ. Max. Units
OSCILLATOR
Frequency fosc V
Pin 5 = 0 V, CT = 1.0 nF, TA = 25°C 24 33 42 KHz
Charge Current Ichg V
CC = 5.0 V to 40 V, TA = 25°C 24 35 42 µA
Discharge Current Idischg V
CC = 5.0 V to 40 V, TA = 25°C 140 220 260 µA
Discharge to Charge Current Ratio Idischg/Ichg Pin 7 to VCC, TA = 25°C 5.2 6.5 7.5 -
Current Limit Sense Voltage Vsense I
chg = Idischg, TA = 25°C 250 300 350 mV
OUTPUT SWITCH
Saturation Voltage, Darlington
Connection VCE(sat) I
SW = 1.0 A, Pins 1, 8 connected - 1.0 1.3 V
Saturation Voltage VCE(sat) ISW = 1.0 A, Rpin 8 =82 Ω to VCC,
Forced β = 20 - 0.45 0.7 V
DC Current Gain hFE I
SW = 1.0 A, VCE = 5.0 V, TA = 25°C 50 75 - -
Collector Off─State Current IC(off) V
CE = 40 V - 0.01 100 µA
COMPARATOR
TA = 25°C 1.225 1.25 1.275
Threshold Voltage Vth TA =0°C to 70°C 1.21 - 1.29 V
Threshold Voltage Line Regulation Regline V
CC = 3.0 V to 40 V - 1.4 5.0 mV
Input Bias Current IIB V
FB = 0 V - -20 -400 nA
TOTAL DEVICE
Supply current ICC
VCC = 5.0 V to 40 V,
CT = 1.0nF, Pin 7 = VCC,
VFB > Vth, Pin 2= GND, remaining
pins open
- - 4.0 mA
AMC34063A
Copyright © 2006 ADDtek Corp. 4 DD014_E -- JUNE 2006
CHARACTERIZATION CURVES
SE pin (PIN#2) waveform
on 5V step down converter
VCC = 25V, 500mA load
CT = 470pF
Cap pin (PIN#3) waveform
Cap pin (PIN#3) waveform
Cap pin (PIN#3) waveform
VCC = 5V, Pin 1, 5, 8 open
CT = 1nF
VCC = 5V, Pin 1, 5, 8 open
CT = 1nF
VCC = 5V, Pin 1, 5, 8 open
CT = 1nF
23.3V
- 0.8V
AMC34063A
Copyright © 2006 ADDtek Corp. 5 DD014_E -- JUNE 2006
Figure 1 – Step-Up Converter Application Circuits
170uH
L
1.25V
Reference
Oscillator
28V/175mA
V
OUT
330uF
4
1500pF
3
C
T
2
Q1
1
Q2 Q
Isen
2.2K
5
47K
6
100uF
12V
V
IN
180
R
7
S
8
0.22
Rsc
Figure 2 – Step-Down Converter Application Circuit
Oscillator
1.25V
Reference
C
T
V
OUT
5V/500mA
470uF
4
470pF
3
220uH
L
1N5819
2
Q1
1
Q2 Q
V
IN
5
3.6K
6
1.2K
100uF
25V
Isen
R
7
S
8
Rsc
0.33
R1
R2
R1
R2
Co
Co
AMC34063A
Copyright © 2006 ADDtek Corp. 6 DD014_E -- JUNE 2006
Figure 3 – Voltage Inverting Converters
Note: For step-up, step-down or voltage inverting applications requiring peak current greater than 1.5A, external boost current circuitry by NPN or
PNP transistors can be used.
1.25V
Reference
C
T
1500pF
-12V/100mA
V
OUT
1000uF
4
3
L
1N5819
88uH
2
1
Q2
Q1
V
IN
3.6K
5
6
1.2K
4.5V to 6.0V
100uF
Ipk
Oscillator
R
7
QS
8
0.24
Rsc
8.2K
953
R1
R2
Co
AMC34063A
Copyright © 2006 ADDtek Corp. 7 DD014_E -- JUNE 2006
Typical Design Reference Table:
Calculation Step-Down Step-Up Voltage-Inverting
ton/toff Vout + VF
Vin(min) − Vsat− Vout Vout + VF − Vin(min)
Vin(min) − Vsat ?Vout? + VF
Vin − Vsat
ton + toff 1
f 1
f 1
f
toff ton + toff
ton/toff + 1 ton + toff
ton/toff + 1 ton + toff
ton/toff + 1
ton (ton + toff) − toff (ton + toff) − toff (ton + toff) − toff
CT 4.0 × 10-5 ton 4.0 × 10-5 ton 4.0 × 10-5 ton
Ipk(switch) 2Iout(max) 2Iout(max) (ton/toff + 1) 2Iout(max) (ton/toff + 1)
RSC 0.3/Ipk(switch) 0.3/Ipk(switch) 0.3/Ipk(switch)
L(min) ((Vin(min) − Vsat− Vout)
Ipk(switch)
)
ton(max)
(
(Vin(min) − Vsat)
Ipk(switch)
)
ton(max)
(
(Vin(min) − Vsat)
Ipk(switch)
)
ton(max)
CO Ipk(switch)( ton + toff)
8Vripple(pp) 9Iout ton
Vripple(pp)
9 Iout ton
Vripple(pp)
VF: Forward Voltage drop of the output rectifier
Vsat: Saturation voltage of the output switch.
The following power supply characteristics must be chosen:
Vin - Nominal input voltage
V
out - Desired output voltage, ?Vout? = 1.25(1 + R1/R2)
I
out - Desired output current.
f
min – Minimum desired output switching frequency at the selected values of Vin and IO
V
ripple(pp) – Desired peak – to – peak output ripple voltage.
Application concerns:
To get the best regulation performance, Low ESR capacitors at Vout are suggested.
AMC34063A
Copyright © 2006 ADDtek Corp. 8 DD014_E -- JUNE 2006
PACKAGE
8-Pin Plastic DIP
INCHES MILLIMETERS
MIN TYP MAX MIN TYP MAX
A 0.355 0.365 0.400 9.02 9.27 10.16
B 0.240 0.250 0.280 6.10 6.35 7.11
C - - 0.210 - - 5.33
D - 0.018 - - 0.46 -
F - 0.060 - - 1.52 -
G - 0.100 - - 2.54 -
H 0.050 - 0.090 1.27 - 2.29
J 0.008 - 0.015 0.20 - 0.38
K 0.115 0.130 0.150 2.92 3.30 3.81
L 0.300 BSC. 7.62 BSC.
M - 7º 15º - 7º 15º
Note: For 8-pin Plastic package, 60 units per tube
8-Pin Plastic S.O.I.C.
INCHES MILLIMETERS
MIN TYP MAX MIN TYP MAX
A 0.183 - 0.202 4.65 - 5.13
B 0.144 - 0.163 3.66 - 4.14
C 0.068 - 0.074 1.35 - 1.88
D 0.010 - 0.020 0.25 - 0.51
F 0.015 - 0.035 0.38 - 0.89
G 0.050 BSC 1.27 BSC
J 0.007 - 0.010 0.19 - 0.25
K 0.005 - 0.010 0.13 - 0.25
L 0.189 - 0.205 4.80 - 5.21
M - - 8º - - 8º
P 0.228 - 0.244 5.79 - 6.20
1
B
5
4
8
C
K
F
H G D
A
L
M
J
SEATING PLAN
A
D
F
P
B
K
C
M
L
J
G
SEATING PLANE
AMC34063A
Copyright © 2006 ADDtek Corp. 9 DD014_E -- JUNE 2006
IMPORTANT NOTICE
ADDtek reserves the right to make changes to its products or to discontinue any integrated circuit product or service
without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing
orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe
property or environmental damage. ADDtek integrated circuit products are not designed, intended, authorized, or
warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of
ADDtek products in such applications is understood to be fully at the risk of the customer. In order to minimize risks
associated with the customer’s applications, the customer should provide adequate design and operating safeguards.
ADDtek assumes to no liability to customer product design or application support. ADDtek warrants the performance of
its products to the specifications applicable at the time of sale.
ADDtek Corp.
9F, No. 20, Sec. 3, Bade Rd., Taipei, Taiwan, 105
TEL: 2-25700299
FAX: 2-25700196
