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AMC7660
www.addmtek.com DESCRIPTION The AMC7660 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 AMC7660 provides an internally trimmed precision 1.5% reference voltage of 1.25V. These features make the AMC7660 suitable for step-up, step-down and voltage-inverting applications.
DC - DC CONVERTER CONTROL CIRCUIT
FEATURES Internally trimmed 1.5% 1.25V Reference Voltage Wide Input Operating Range: 3.0V to 40V Output Switch Current up to 1.5A Low Standby Current 100KHz operational Frequency Adjustable Output Voltage Available in 8 Pin Plastic DIP and 8 Pin S.O Packages
APPLICATIONS Automobile Chargers Adaptors Mother Board External Modem ISDN Modem Scanner Cellular Phones/Radios Laptop/Notebook
PACKAGE PIN OUT
OC1 E1 CT GND
1 2 3 4
8 7 6 5
OC2 IS VCC VIN-
M
PACKAGE
(TOP VIEW) OC1 E1 CT GND 1 2 3 4 8 7 6 5 OC2 IS VCC VIN-
DM
PACKAGE
(TOP VIEW)
ORDER INFORMATION TA (OC) 0 to 70 0 to 70
Note:
Plastic DIP 8-pin AMC7660M AMC7660MF(Lead Free)
M
Plastic SO-8 8-pin AMC7660DM AMC7660DMF(Lead Free)
DM
1.All surface-mount packages are available in Tape & Reel. 2.The letter "F" is marked for Lead Free process.
Append the letter "T" to part number (i.e. AMC7660DMT).
Copyright (c) 2006 ADDtek Corp.
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ABSOLUTE MAXIMUM RATINGS Power Supply Voltage (VCC) ...............................................................................................40V Operating Junction temperature Plastic (M, DM Package) ................................................................................................ 150 OC Storage Temperature Range .................................................................................. -65 OC to 150 OC Lead temperature (Soldering, 10 seconds) .............................................................................300 OC
Note 1: Exceeding these ratings could cause damage to the device. negative out of the specified terminal. All voltages are with respect to Ground. Currents are positive into,
THERMAL DATA M PACKAGE: Thermal Resistance-Junction to Ambient, JA DM PACKAGE: Thermal Resistance-Junction to Ambient, JA BLOCK DIAGRAM
IS 7 OC2 8 S VCC 6 5 VIN-
95 OC/W 165 OC/W
OC1 1 Q1
Q2
Q
R
1.25V
100 E1 2
I sense CT 3 CT Oscillator 4 GND
Copyright (c) 2006 ADDtek Corp.
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RECOMMENDED OPERATING CONDITIONS Recommended Operating Parameter Symbol Min. Typ. Max. VIR Comparator Input Voltage -0.3 to + 40 VOC1 Switch Collector Voltage 40 VE1 Switch Emitter Voltage (VPin1=40V) 40 VCE1 Switch Collector to Emitter Voltage 40 VC2 Driver Collector Voltage 40 IC2 Driver Collector Current (Note 1) 100 ISWITCH Switch Current 1.5 CT Oscillator Timing Capacitor (connected to CT pin) 1.0 Operating Ambient Temperature Range TA 0 to +70
Note 1: Maximum package power dissipation limits must be observed.
Units V V V V V mA A nF C
ELECTRICAL CHARACTERISTICS VCC=5.0 V, TA=0 C to 70 C, unless otherwise specified.
O O
Parameter
Symbol
Test Conditions
O VIN- = 0 V, CT = 1.0 nF, TA = 25 C VCC = 5.0 V to 40 V, TA = 25 OC VCC = 5.0 V to 40 V, TA = 25OC IS to VCC, TA = 25 OC Ichg = Idischg, TA = 25 OC
AMC7660 Min. Typ. Max.
24 24 140 5.2 250 50 33 35 220 6.5 300 0.9 0.4 75 0.01 42 42 260 7.5 350 1.3 0.7 100
Units
KHz A A mV V V A
OSCILLATOR Frequency Fosc Charge Current Ichg Discharge Current Idischg Discharge to Charge Current Ratio Idischg/Ichg Current Limit Sense Voltage VIS OUTPUT SWITCH Saturation Voltage, Darlington Connection VCE1(sat) Saturation Voltage DC Current Gain Collector OffState Current COMPARATOR Threshold Voltage Threshold Voltage Line Regulation Input Bias Current Vth Vth(line) IIB VCE1(sat) hFE IC(off)
ISW = 1.0 A, OC1, OC2 connected ISW = 1.0 A, 82 connected from OC2 to VCC, Forced = 20 ISW = 1.0 A, VCE = 5.0 V, TA = 25 O C VCE = 40 V TA = 25 OC TA =0 OC to 70 OC VCC = 3.0 V to 40 V VIN- = 0 V VCC = 5.0 V to 40 V, CT = 1.0nF, Pin 7 = VCC, VIN- > Vth, Pin 2= Gnd, remaining pins open
1.23 1.25 1.27 1.22 1.28 1.4 5.6 -20 -400
V mV nA
TOTAL DEVICE
Supply current ICC 3.0 3.9 mA
Copyright (c) 2006 ADDtek Corp.
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CHARACTERIZATION CURVES
VCC = 5V, Pin 1, 5, 8 open CT = 470pF
VCC = 5V, Pin 1, 5, 8 open CT = 470pF
CT pin (PIN#3) waveform
CT pin (PIN#3) waveform
VCC = 5V, Pin 1, 5, 8 open CT = 470pF
VCC = 25V, Pin 1, 5, 8 open CT = 470pF
CT pin (PIN#3) waveform
CT pin (PIN#3) waveform
VCC = 25V, Pin 1, 5, 8 open CT = 470pF
VCC =25V, Pin 1, 5, 8 open CT = 470pF
CT pin (PIN#3) waveform
CT pin (PIN#3) waveform
Copyright (c) 2006 ADDtek Corp.
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CHARACTERIZATION CURVES
VCC = 5V, Pin 1, 5, 8 open CT = 1nF
VCC = 5V, Pin 1, 5, 8 open CT = 1nF
CT pin (PIN#3) waveform
CT pin (PIN#3) waveform
VCC = 5V, Pin 1, 5, 8 open CT = 1nF
VCC = 25V, Pin 1, 5, 8 open CT = 1nF
CT pin (PIN#3) waveform
CT pin (PIN#3) waveform
VCC = 25V, Pin 1, 5, 8 open CT = 1nF
VCC =25V, Pin 1, 5, 8 open CT = 1nF
CT pin (PIN#3) waveform
Copyright (c) 2006 ADDtek Corp. 5
CT pin (PIN#3) waveform
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AMC7660
CHARACTERIZATION CURVES
VCC = 25V, 500mA load CT = 470pF
23.3V
VCC = 25V, 500mA load CT = 470pF CT pin waveform
- 0.8V
5V output
E1 pin (PIN#2) waveform on 5V step down converter
Step down 5V output performance
Copyright (c) 2006 ADDtek Corp.
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Figure 1 - Step-Up Converter Application Circuits
47K 0.22
R1
V IN 12V 100uF 5
Rsc
7 180 8 170uH VOUT 28V/175mA 1 D1 330uF OC1 Q1 100 2 CT 3 1.5nF I sense Oscillator 4 Q2 Q OC2 S 6
R2
2.2K
R
1.25V
Co
Figure 2 - Step-Down Converter Application Circuit
3.6K 0.33
R1
V IN 25V 100uF 5
Rsc
7 8 OC2 S 6
R2
1.2K
1
OC1 Q1
Q2
Q
R
1.25V
VOUT 5V/500mA 220uH 2
100
I sense CT 3 470pF Oscillator 4
Co
470uF
D1
Copyright (c) 2006 ADDtek Corp.
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Figure 3 - Voltage Inverting Converters
Co 1000uF
953 0.24
R2
V IN 4.5V to 6.0V 100uF 5
Rsc
7 8 OC2 S V OUT -12V/100mA OC1 Q1 D1 2 88uH 3 1.5nF CT 100 I sense Oscillator 4 6
R1
8.2K
1
Q2
Q
R
1.25V
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.
Copyright (c) 2006 ADDtek Corp.
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Typical Design Reference Table:
Calculation ton/toff ton + toff toff ton CT Ipk(switch) RSC L(min) CO Step-Down Vout + VF Vin(min) - Vsat- Vout 1 f ton + toff ton/toff + 1 (ton + toff) - toff 4.0 x 10 ton
-5
Step-Up Vout + VF - Vin(min) Vin(min) - Vsat 1 f ton + toff ton/toff + 1 (ton + toff) - toff 4.0 x 10 ton
-5
Voltage-Inverting ?Vout? + VF Vin - Vsat 1 f ton + toff ton/toff + 1 (ton + toff) - toff 4.0 x 10-5 ton 2Iout(max) (ton/toff + 1) 0.3/Ipk(switch)
on(max)
2Iout(max) 0.3/Ipk(switch)
2Iout(max) (ton/toff + 1) 0.3/Ipk(switch)
( (V
in(min) -
Vsat- Vout) Ipk(switch)
)t
on(max)
( (V I
in(min) -
Vsat)
pk(switch)
)t
( (V I
in(min) -
Vsat)
pk(switch)
)t
on(max)
Ipk(switch)( ton + toff) 8Vripple(pp)
9
Iout ton Vripple(pp)
9
Iout ton Vripple(pp)
VF: Vsat:
Forward Voltage drop of the output rectifier Saturation voltage of the output switch.
The following power supply characteristics must be chosen: Vin - Nominal input voltage Vout - Desired output voltage, ?Vout? = 1.25(1 + R1/R2) Iout - Desired output current. fmin - Minimum desired output switching frequency at the selected values of Vin and IO Vripple(pp) - Desired peak - to - peak output ripple voltage.
Application concerns: To get the best regulation performance, Low ESR capacitors at Vout are suggested.
Copyright (c) 2006 ADDtek Corp.
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PACKAGE
8-Pin Plastic DIP
8 5
B
INCHES MIN A B TYP MAX
MILLIMETERS MIN 9.02 6.10 1.27 0.20 2.92 TYP 9.27 6.35 0.46 1.52 2.54 3.30 7.62 BSC. 15 7 15 MAX 10.16 7.11 5.33 2.29 0.38 3.81
1
4
0.355 0.365 0.400 0.240 0.250 0.280 0.018 0.060 0.100 0.210 0.090 0.015
A
C D F
F
L
G
H 0.050
C
J
K H G D J M
0.008
K L M
0.115 0.130 0.150 0.300 BSC. 7
8-Pin Plastic S.O.I.C.
INCHES MILLIMETERS MAX 0.202 0.163 0.074 0.020 0.035 MIN 4.65 3.66 1.73 0.25 0.38 TYP 1.27 BSC 0.19 0.13 4.80 5.79 0.25 0.25 5.21 8 6.20 MAX 5.13 4.14 1.88 0.51 0.89
A
A B
MIN 0.183 0.144
TYP -
B F
P
C 0.068 D 0.010 F 0.015
D
G L C
G J K
0.050 BSC 0.007 0.005 0.189 0.228 0.010 0.010 0.205 8 0.244
SEATING PLAN
K
M J
L M P
Copyright (c) 2006 ADDtek Corp.
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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
Copyright (c) 2006 ADDtek Corp.
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