AMC7635 [ADDTEK]
300mA CMOS LOW DROPOUT REGULATOR; 300毫安CMOS低压差稳压器
| 型号： | AMC7635 |
| 厂家： | 
ADDTEK CORP |
| 描述： | 300mA CMOS LOW DROPOUT REGULATOR |
| 文件： | 总9页 (文件大小：154K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AMC7635
300mA CMOS
LOW DROPOUT REGULATOR
www.addmtek.com
DESCRIPTION
FEATURES
Guaranteed 300mA Output
The AMC7635 of positive, linear regulator features low
noise and low dropout voltage, making it ideal for battery
applications. The space-saving SOT-23-5 package is attractive
for "Pocket" and "Hand Held" applications.
Accurate to within 1.5%
Very Low Dropout Voltage
Over-Temperature Shutdown
Power-Saving Shutdown Mode
Current Limiting
In applications requiring a low noise, regulated supply,
place a 1000pF capacitor between Bypass and Ground.
Noise Reduction Bypass Capacitor
Factory Pre-set Output Voltages
Low Temperature Coefficient
Available in SOT-23-5 packages
The AMC7635 is stable with an output capacitance of
2.2µF or greater.
TYPICAL APPLICATION CIRCUIT
APPLICATIONS
Wireless Devices
Portable Electronics
Cordless Phones
VIN
BP
VOUT
EN
VIN
VOUT
AMC7635
PC Peripherals
CIN
1uF
COUT
2.2uF
GND
Battery Powered Widgets
Electronic Scales
Instrumentation
CBP
1000pF
GND
VOLTAGE OPTIONS
PACKAGE PIN OUT
AMC7635-1.5
AMC7635-1.8
AMC7635-2.0
AMC7635-2.5
AMC7635-2.8
AMC7635-3.0
AMC7635-3.1
AMC7635-3.3
AMC7635
– 1.5V Fixed
– 1.8V Fixed
– 2.0V Fixed
– 2.5V Fixed
– 2.8V Fixed
– 3.0V Fixed
– 3.1V Fixed
– 3.3V Fixed
1
2
3
5
VIN
GND
EN
VOUT
4
BP
5-Pin Plastic SOT-23-5
Surface Mount
(Top View)
– Adjustable Output
ORDER INFORMATION
Plastic SOT-23-5
TA ( °C )
DB
5-pin
0 to 70
AMC7635-X.XDBFT (Lead Free)
Note: 1. All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e. AMC7635-X.XDBT).
Note: 2. The letter “F” is marked for Lead Free process.
Copyright © 2007 ADDtek Corp.
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DD078_A -- SEPTEMBER 2007
AMC7635
BLOCK DIAGRAM
1
VOUT
5
VIN
Over Current
Shutdown
Thermal
Shutdown
EN
BP
3
4
－
R1
R2
AMP
＋
VREF
GND
2
ABSOLUTE MAXIMUM RATINGS (Note)
7V
Input Voltage, VIN
0°C to 150°C
-65°C to 150°C
260°C
Operating Junction Temperature Range, TJ
Storage Temperature Range, TSTG
Lead Temperature (soldering, 10 seconds)
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.
POWER DISSIPATION TABLE
DB PACKAGE:
Thermal Resistance from Junction to Ambient, θJA
220℃/W
Junction Temperature Calculation: TJ = TA + (PD ×θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system. Connect the ground pin to ground
using a large pad or ground plane for better heat dissipation. All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Min.
Typ.
Max.
6
Units
Input Voltage
VIN
IO
VOUT +∆V
V
mA
OC
Load Current (with adequate heat-sinking)
Junction temperature
5
TJ
125
Copyright © 2007 ADDtek Corp.
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DD078_A -- SEPTEMBER 2007
AMC7635
ELECTRICAL CHARACTERISTICS
V
IN = VOUT(Nominal)＋0.5V, VIN,MAX = 6V, TA = 25℃ (unless otherwise noted)
Parameter
Symbol
Test Conditions
Min Typ Max Units
IO = 1mA
-1.5
-2.5
+1.5
+2.5
Output Voltage Accuracy
VOUT
%
IO = 1 to 300mA
∆VOUT
∆VIVOUT
∆VOUT
Line Regulation
Load Regulation
IO = 1mA, VOUT + 0.5V < VIN < 6V
0.15 0.35 %/V
1mA ≤ IO ≤ 300mA
10 70 mV
VOUT(NOM) ≤ 2.0V
330 500
220 350
165 250
1300
IO=150mA,
OUT=VOUT(NOM)-2.0%
2.0V<VOUT(NOM)≤2.5V
VOUT(NOM) > 2.5V
VOUT ≤ 2.0V
V
Dropout Voltage
∆V
mV
IO=300mA,
OUT＝VOUT(NOM)-2.0%
2.0V<VOUT≤2.5V
VOUT > 2.5V
900
V
600
Maximum Output Current
Current Limit
IO
VOUT > 0.96 × VRATING
VOUT > 1.2V
300
mA
ILIMIT
300 400
50 100
IO = 0mA ~ 10mA
IO = 10mA ~ 150mA
IO = 150mA ~ 300mA
Ground Pin Current
IQ
µA
100 150
120 180
600
Output Shutdown Delay
EN “high” Bias Current
EN “low” Bias Current
Shutdown Supply Current
EN “low” Input Threshold
EN “high” Input Threshold
CBP = 0µF, COUT = 1µF, IO = 100mA
µS
uA
µA
V
VEN = VIN
VEN = 0V
0.1
IIH
IIL
0.5
V
EN = GND
0.01
1
VIL
VIH
VIN = 2.5 to 5.5V
VIN = 2.5 to 5.5V
0
2
0.4
VIN
f = 1kHz
60
50
40
IO=100mA
CBP=0.01uF
COUT=2.2uF
Power Supply Rejection
Ratio
PSRR
dB
°C
f = 10kHz
f = 100kHz
Thermal Protection
Temperature
150
30
Thermal Protection
Temperature Hysteresis
Note 1:
For the adjustable device, the minimum load current is the minimum current required to maintain regulation. Normally the current in
the resistor divider used to set the output voltage is selected to meet the minimum load current requirement.
Note 2:
These parameters, although guaranteed, are not tested in production.
Copyright © 2007 ADDtek Corp.
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DD078_A -- SEPTEMBER 2007
AMC7635
CHARACTERIZATION CURVES
Unless otherwise specified, VIN = 5V, CIN = 1µF, CBP = 0.01uF, COUT = 2.2µF, TA = 25OC.
Chip Enable Transient Response
VIN=5V, CIN=1uF, COUT=2.2uF, CBP=1000pF
Chip Enable Transient Response
VIN=5V, CIN=1uF, COUT=2.2uF, CBYP=Open
RLOAD=10Ω
AMC7635-3.3
RLOAD=10Ω
AMC7635-3.3
TIME= 1 ms/DIV
TIME= 1 ms/DIV
Short Circuit Response
Over Temperature Shutdown
VIN=5V, CIN=1uF, COUT=2.2uF,CBP=0.01uF
VIN=5V, CIN=1uF, COUT=2.2uF,CBYP=0.01uF
RLoad =100Ω
Short =0.1Ω
Ω
RLoad =6.6
AMC7635-3.3
R
TIME= 20 ms/DIV
TIME= 400 ms/DIV
Load Step (1mA~300mA)
Line Transient Response
VIN=5V, CIN=2.2uF, COUT=2.2uF, CBYP=0.01uF
VIN,AVE=5V, CIN=2.2uF, COUT=2.2uF, CBYP=0.01uF
AMC7635-3.3
IO= 1mA ~ 300mA
AMC7635-3.3
TIME= 10 ms/DIV
Copyright © 2007 ADDtek Corp.
TIME= 2 ms/DIV
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DD078_A -- SEPTEMBER 2007
AMC7635
Ground Pin Current vs. Temperature
Ground Current vs. Input Voltage
90.00
75.00
60.00
45.00
30.00
15.00
0.00
62.5
60
85
℃
57.5
55
25
℃
52.5
50
-45
-20
5
30
55
80
0.0
1.4
2.8
4.2
5.6
7.0
Temperature(
)
Input Voltage(V)
℃
Sofe Operating Area
Drop Out Voltage vs. Load Current
400
300
200
100
0
600.0
500.0
400.0
300.0
200.0
100.0
0.0
VOUT=1.5V
VOUT=1.8V
VOUT=2.0V
T =70
℃
A
T =25
℃
A
VOUT=2.5V , VOUT=3.1V,
VOUT=2.8V , VOUT=3.3V,
VOUT=3.0
0
50
100
150
200
250
300
0
1
2
3
4
5
6
7
Load Current(mA)
Input-Output Voltage Diff erential (V)
Dropout Voltage vs. Temperature
Drop Out Voltage vs. Output Voltage
600.0
500.0
400.0
300.0
200.0
100.0
0.0
400
350
300
250
200
Io=300mA
Io=200mA
Io=100mA
VOUT = 3.3V
IOUT = 300mA
1.5
1.8
2.0
2.5
2.8
3.0
3.1
3.3
-45
-20
5
30
55
80
Temperature(
)
Output Voltage(V)
℃
Copyright © 2007 ADDtek Corp.
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DD078_A -- SEPTEMBER 2007
AMC7635
Pow er Supply Rejection Ratio
Pow er Supply Rejection Ratio
70
60
50
40
30
20
10
0
60
50
40
30
20
10
0
Io=100mA
CIN =1uF
COUT=2.2uF
CBP=Open
Io=300mA
Io=1mA
Io=1mA
Io=100mA
Io=10mA
Io=10mA
CIN =1uF
COUT=2.2uF
BP=0.01uF
C
Io=300mA
100
1K
10K
100K
1M
100
1K
10K
100K
Freqency
Freqency
Power Supply Rejection Ratio
70
60
50
40
30
20
10
0
C
IN=1uF
OUT=2.2uF
CBP=10nF
C
Io=100mA
CBP=1nF
CBP=100pF
CBP=Open
100
1K
10K
100K
Freqency
Copyright © 2007 ADDtek Corp.
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DD078_A -- SEPTEMBER 2007
AMC7635
APPLICATION INFORMATION
VIN
BP
VOUT
VIN
VOUT
EN
AMC7635
COUT
CIN
GND
2.2uF
1uF
CBP
1000pF
GND
Detailed Description
The AMC7635 CMOS low dropout regulator contains a PMOS pass transistor, a voltage reference, an error
amplifier, over-current protection, and thermal shutdown circuit.
The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal
protection circuits. During normal operation, the error amplifier compares the output voltage to a precision
reference. Thermal shutdown and over-current circuits become active when the junction temperature exceeds
150℃, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation
is restored when the junction temperature drops below 120℃.
External Capacitors
The AMC7635 is stable with an output capacitor to ground of 2.2µF or greater. Ceramic capacitors have the
lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the
highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively
expensive. One option is to parallel a 0.1
low ESR, high capacitance, and low over-all cost.
A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should be
at least 0.1 F to have a beneficial effect.
A third capacitor can be connected between the BP pin and GND. This capacitor can be a low cost Polyester
Film variety between the value of 0.001 ~ 0.01 F. A larger capacitor improves the AC ripple rejection, but also
µF ceramic capacitor with a 10µF Aluminum Electrolytic. The benefit is
µ
µ
makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges.
All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This
can be achieved with a "Star" connection.
EN
The EN pin is normally pulled to high. When shutdown, pulled low, the PMOS pass transistor shuts off, and
all internal circuits are powered down. In this state, the quiescent current is less than 1
like an electronic switch.
µA. This pin behaves much
Copyright © 2007 ADDtek Corp.
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DD078_A -- SEPTEMBER 2007
AMC7635
PACKAGE
5-Pin SOT-23-5
SEATING PLANE
D
INCHES
MILLIMETERS
b
MIN
TYP MAX
MIN
TYP MAX
L
L1
A
-
-
-
-
0.057
0.006
-
-
-
1.45
0.15
1.30
0.50
0.22
A1
-
E
E1
A2 0.035 0.045 0.051 0.90
1.15
b
c
0.012
0.003
-
0.020 0.30
0.009 0.08
-
-
-
D
0.114 BSC
0.110 BSC
0.063 BSC
0.037 BSC
0.075 BSC
2.90 BSC
2.80 BSC
1.60 BSC
0.95 BSC
1.90 BSC
0.45
c
L2
e
E
e1
E1
e
GAUGE PLANE
M
e1
L
A2
0.012 0.018 0.024 0.30
0.024 REF
0.60
15°
A
L1
L2
°M
0.60 REF
0.25 BSC
10°
M
0.010 BSC
A1
5
°
10
°
15
°
5°
Copyright © 2007 ADDtek Corp.
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DD078_A -- SEPTEMBER 2007
AMC7635
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 © 2007 ADDtek Corp.
9
DD078_A -- SEPTEMBER 2007
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