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AMC7638
www.addmtek.com DESCRIPTION The AMC7638 series is a low dropout regulator rated for 450mA output current. Low power consumption and high accuracy is achieved through CMOS technology and internal trimmed reference voltage. The AMC7638 series consists of a high-precision voltage reference, error correction circuit, and a current limit output driver. The fast transient response is an outstanding feature for applications with various loads
450mA LOW DROPOUT REGULATOR
FEATURES 2% internally trimmed output Input-Output differential of typ. 360mV at 300mA & low quiescent current of 10A in typical P-MOS output stage with low RDS, ON. Short circuit protection Internal thermal overload protection Enhanced pin-to-pin compatible to the XC62FP series, RT9261/A. 3-Lead SOT-89 and SOT-223 packages. Lead (Pb) free process PACKAGE PIN OUT
3. VOUT 2. VIN 1. GND
AMC76381-X.XPKF
APPLICATIONS CD ROM, DVD Wireless Communication Systems Digital Camera Battery Powered Applications VOLTAGE OPTIONS
AMC76381-1.5 - 1.5V Fixed AMC76381-1.8 - 1.8V Fixed AMC76381-2.5 - 2.5V Fixed AMC76381-3.3 - 3.3V Fixed AMC76382-1.5 - 1.5V Fixed AMC76382-2.5 - 2.5V Fixed AMC76382-3.3 - 3.3V Fixed AMC76383-1.5 - 1.5V Fixed AMC76383-2.5 - 2.5V Fixed AMC76383-3.3 - 3.3V Fixed AMC76385-2.5 - 2.5V Fixed AMC76385-3.3 - 3.3V Fixed
3. VIN 2. GND 1. VOUT
AMC76382-X.XPKF 3-Pin Plastic SOT-89 Surface Mount (Top View)
3-Pin Plastic SOT-89 Surface Mount (Top View)
3. VOUT 2. GND 1. VIN
AMC76383-X.XSKF 3-Pin Plastic SOT-223 Surface Mount (Top View)
3. VIN 2. VOUT 1. GND
AMC76385-X.XSKF 3-Pin Plastic SOT-223 Surface Mount (Top View)
TA (OC) -40 to 85
Note:
ORDER INFORMATION Plastic SOT-89 Plastic PK 3-pin SK 3-pin SOT-223 AMC76381-X.XPKF AMC76382-X.XPKF AMC76383-X.XSKF AMC76385-X.XSKF
1. All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number (i.e. AMC76381-X.XPKFT, AMC76383-X.XSKFT). 2. The letter "F" is marked for Lead Free process. 1 DD054_N -MAY 2007
Copyright (c) 2007 ADDtek Corp.
AMC7638
TYPICAL APPLICATION
VIN AMC7638 CIN 1F COUT 4.7F VOUT
ABSOLUTE MAXIMUM RATINGS Input Voltage, VIN Maximum Operating Junction Temperature, TJ Storage Temperature Range Lead Temperature (soldering, 10 seconds)
(Note)
13V 150OC -65OC to 150OC 260OC
Note: 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.
RECOMMENDED OPERATING CONDITIONS Parameter Input Voltage Load Current (with adequate heat sinking) Input Capacitor (VIN to GND) Output Capacitor with ESR of 10 max., (VOUT to GND) Operating ambient temperature range Operating junction temperature Symbol VIN IO Min. 3.0 5 0.1 1.0 -40 Typ. 300 Max. 10 500 Units V mA F F O C O C
TA TJ
85 125
POWER DISSIPATION TABLE Package PK
Note:
JA ( C/ W )
O
Derating factor (mW/OC ) TA 25OC 14.1
TA 25OC Power rating (mW) 1763
TA=70OC Power rating (mW) 1128
TA= 85OC Power rating (mW) 916
71(Note)
TJ = TA + (PD x JA) PD: Power dissipation. JA: Thermal resistance from Junction to Ambient. For PK package, JT = 35O C / W. TJ = TTAB + (PD x JT) TTAB: Tab temperature. JT: Thermal resistance from junction to tab of the package. The JA numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no ambient airflow.
Copyright (c) 2007 ADDtek Corp.
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AMC7638
BLOCK DIAGRAM
VIN
Current Limiter VOUT
VREF
GND
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, VIN = VOUT(TYP) + 1V, IO = 10mA, COUT = 4.7F, TA=25 OC. (Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter AMC7638X-1.5 AMC7638X-1.8 AMC7638X-2.5 AMC7638X-3.3
Symbol
Test Conditions
Min 1.470 1.764 2.450 3.234
Typ 1.500 1.800 2.500 3.300 0.2 15 45 100 300 150 450 200 600 8
Max 1.530 1.836 2.550 3.366 0.4 30 80 180 550 300 800 400 1100 20
Units
Output Voltage
VO VOI VOL
IO = 10mA VIN = (VOUT + 0.5V) to 10V 10mA IO 100mA 10mA IO 300mA IO = 100mA VO>2.5V IO = 300mA IO = 100mA 2.0VO O
V
Line Regulation Load regulation
%/V mV
Dropout Voltage
V
mV
Ground Pin Current Current Limit Output Voltage Temperature Coefficient
IQ ICL
400 100
A mA ppm/OC
Copyright (c) 2007 ADDtek Corp.
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AMC7638
CHARACTERISTIC CURVES
Load Regulation
3.5 3.4
Line Regulation
3.50
AMC7638X-3.3
3.45
AMC7638X-3.3
3.3 3.2 3.1 3.0 2.9 2.8 0 100 200 300 400 500
Output Voltage (V)
Output Voltage (V)
3.40 3.35 3.30 3.25 3.20 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5
Dropout Voltage vs. Temperature
0.6 0.5
Io (mA)
Input Voltage (V)
Output Voltage vs. Temperature
3.5 3.4
Dropout Voltage (V)
AMC7638X-3.3
Io=10mA
0.4
Output Voltage (V)
3.3 3.2 3.1 3.0 2.9
Io=500mA Io=100mA
0.3 0.2 0.1 0 0 100 200 300 400 500
Io=300mA
2.8 -40 -20 0 20 40 60 80 100 120 140 TA (oC)
Io (mA)
Dropout Voltage vs. Temperature
0.50 0.45 0.40
14
Quiescent Current vs. Output Current
Dropout Voltage
12 Quiescent Current (uA)
0.35 0.30 0.25 0.20 0.15 0.10 0.05
-40 -20 0 20 40
Io=100mA Io=300mA
10
8
6
60
80
100
120
140
4 0 100 200 300 Io (mA) 400 500
TA (oC)
Copyright (c) 2007 ADDtek Corp.
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AMC7638
CHARACTERIZATION CURVES (Continued)
Quiescent Current vs. Temperature
20 18 16
Quiescent Current (uA)
Load Transient Response
Output Voltage Deviation ( mV) Io = 50mA VIN=5V CIN = 1 uF COUT = 4.7 uF
14 12 10 8 6 4 2 0
-40 -20 0 20 40 60 TA (oC) 80 100 120
20mV/Div
Time: 100s/ Div
Load Transient Response
Output Voltage Deviation ( mV)
20mV/Div
Io = 100mA VIN=5V CIN = 1 uF COUT = 4.7 uF
Time: 100s/ Div
Copyright (c) 2007 ADDtek Corp.
Load current ( mA)
50mA/Div
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Load current ( mA)
50mA/Div
AMC7638
APPLICATION INFORMATION The maximum power dissipation of a single-output regulator PD(MAX) = [(VIN(MAX) - VOUT(NOM))] x IOUT(NOM) + VIN(MAX) x IQ VOUT(NOM) = the nominal output voltage IOUT(NOM) = the nominal output current, and IQ = the quiescent current the regulator consumes at IOUT(MAX) VIN(MAX) = the maximum input voltage Thermal consideration The AMC7638 series have internal power and thermal limiting circuitry designed to protect the device under overload conditions. However maximum junction temperature ratings should not be exceeded under continuous normal load conditions. The thermal protection circuit of AMC7638 series will prevent the device from damage due to excessive power dissipation. When the device temperature rises to approximately 150 OC, the regulator will be turned off. When power consumption is over about 775mW (SOT89 package, at TA=70 OC), additional heat sink is required to control the junction temperature below 125 OC. The junction temperature is: TJ = PD (JT + CS + SA ) + TA P D:Dissipated power. JT:Thermal resistance from the junction to the mounting tab of the package. CS:Thermal resistance through the interface between the IC and the surface on which it is mounted. (typically, CS < 1.0 OC /W) SA:Thermal resistance from the mounting surface to ambient (thermal resistance of the heat sink). If PC Board copper is going to be used as a heat sink, below table can be used to determine the appropriate size of copper foil required. For multi-layered PCB, these layers can also be used as a heat sink. They can be connected with several through hole vias.
PCB SA (OC /W ) PCB heat sink size (mm )
2
59 500
45 1000
38 1500
33 2000
27 3000
24 4000
21 5000
Recommended figure of PCB area used as a heat sink.
through hole vias
(Top View)
(Bottom View)
Copyright (c) 2007 ADDtek Corp.
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AMC7638
PACKAGE
3-Pin Surface Mount SOT-89
INCHES MILLIMETERS MAX 0.181 0.102 0.063 0.017 0.090 0.019 MIN 4.39 2.28 1.39 0.38 2.13 0.33 TYP 1.49 BSC 2.99 BSC 0.45 3.94 1.70 0 0.89 0.55 4.24 1.82 8 1.19 MAX 4.59 2.59 1.60 0.43 2.28 0.48
A L
C D
A B
MIN 0.173 0.090
TYP -
C 0.055
K N F J G H
B
E
D 0.015 E F 0.084 0.016
M
G H J K L M
0.059 BSC 0.118 BSC 0.018 0.155 0.067 0 0.022 0.167 0.072 8 0.047
N 0.035
3-Pin Surface Mount SOT-223 ( SK )
D A
c
B1
MILLIMETERS MIN A A1 1.50 0.02 0.60 2.90 0.28 6.30 3.30 TYP 1.65 0.05 0.70 0.30 6.50 3.50 2.3 BSC 4.6 BSC 6.70 0.91 1.50 0 7.00 1.00 1.75 5 3 7.30 1.10 2.00 10 MAX 1.80 0.08 0.80 3.15 0.32 6.70 3.70
H
E
B B1
K L
c D
A1
e e1
E e e1 H L K
B

Copyright (c) 2007 ADDtek Corp.
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AMC7638
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) 2007 ADDtek Corp. 8 DD054_N -MAY 2007

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