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ADP3307ART-27 데이터시트 PDF




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부품번호 ADP3307ART-27 기능
기능 High Accuracy anyCAP 100 mA Low Dropout Linear Regulator
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ADP3307ART-27 데이터시트, 핀배열, 회로
a
High Accuracy anyCAP™
100 mA Low Dropout Linear Regulator
ADP3307
FEATURES
0.8% Accuracy Over Line and Load Regulations @ +25؇C
Ultralow Dropout Voltage: 120 mV Typical @ 100 mA
Requires only CO = 0.47 F for Stability
anyCAP = Stable with All Types of Output Capacitors
(Including MLCC)
Current and Thermal Limiting
Low Noise
Dropout Detector
Low Shutdown Current: 1 A
3.0 V to 12 V Supply Range
–20؇C to +85؇C Ambient Temperature Range
Several Fixed Voltage Options
Ultrasmall SOT-23-6 (RT-6) Package
Excellent Line and Load Regulations
APPLICATIONS
Cellular Telephones
Notebook, Palmtop Computers
Battery Powered Systems
PCMCIA Regulator
Bar Code Scanners
Camcorders, Cameras
FUNCTIONAL BLOCK DIAGRAM
IN Q1
ERR
Q2
SD
THERMAL
PROTECTION
CC
DRIVER
ADP3307
OUT
R1
GM
BANDGAP
REF
NR
R2
GND
VIN
C1 +
0.47F –
NR
ADP3307-3.3
IN OUT
ERR
R1
330k
EOUT
VOUT = +3.3V
C2
0.47F
ON
OFF
SD GND
Figure 1. Typical Application Circuit
GENERAL DESCRIPTION
The ADP3307 is a member of the ADP330x family of precision
low dropout anyCAP voltage regulators. The ADP3307 stands
out from the conventional LDOs with a novel architecture and
an enhanced process. Its patented design requires only a 0.47 µF
output capacitor for stability. This device is stable with any type
of capacitor regardless of its ESR (Equivalent Series Resistance)
value, including ceramic types (MLCC) for space restricted
applications. The ADP3307 achieves exceptional accuracy of
± 0.8% at room temperature and ± 1.4% overall accuracy over
temperature, line and load regulations. The dropout voltage of
the ADP3307 is only 120 mV (typical) at 100 mA.
The ADP3307 operates with a wide input voltage range from
3.0 V to 12 V and delivers a load current in excess of 100 mA.
It features an error flag that signals when the device is about to
lose regulation or when the short circuit or thermal overload
protection is activated. Other features include shutdown and
optional noise reduction capabilities. The ADP330x anyCAP
LDO family offers a wide range of output voltages and output
current levels from 50 mA to 300 mA:
ADP3300 (50 mA, SOT-6)
ADP3307 (100 mA, SOT)
ADP3301 (100 mA, SO-8)
ADP3302 (100 mA, Dual Output)
ADP3303 (200 mA)
ADP3306 (300 mA)
anyCAP is a trademark of Analog Devices, Inc.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1997




ADP3307ART-27 pdf, 반도체, 판매, 대치품
ADP3307–Typical Performance Characteristics
3.202
3.201
3.200
IL = 0mA
VOUT = 3.2V
IL = 10mA
3.199
3.198
IL = 50mA
3.197
3.196
IL = 100mA
3.195
3.3 4 5 6 7 8 9 10 11 12 13 14
INPUT VOLTAGE – Volts
Figure 2. Line Regulation Output
Voltage vs. Supply Voltage
3.202
3.201
3.200
VOUT = 3.2V
VIN = 7V
3.199
3.198
3.197
3.196
3.195
0 10 20 30 40 50 60 70 80 90 100
OUTPUT LOAD – mA
Figure 3. Output Voltage vs. Load
Current Up to 100 mA
800
VOUT = 3.2V
IL = 0
640
480
320
160
0
0 1.2 2.4 3.6 4.8 6.0 7.2 8.4 9.6 10.8 12.0
INPUT VOLTAGE – Volts
Figure 4. Quiescent Current vs. Sup-
ply Voltage—3.2 V (Both Outputs)
900
750
600
450
IL = 0 TO 100mA
300
150
0
25 50 75
OUTPUT LOAD – mA
100
Figure 5. Ground Current vs. Load
Current
0.2
0.1
IL = 0
0.0
–0.1
IL = 50mA
–0.2
–0.3
IL = 100mA
–0.4
–45 –25 –5 15 35 55 75 95 115 135
TEMPERATURE – ؇C
Figure 6. Output Voltage Variation %
vs. Temperature
1000
800
600
400
200
0
–25 –5
15 35 55 75 95 115 135
TEMPERATURE – ؇C
Figure 7. Quiescent Current vs.
Temperature
120
96
72
48
24
0
0 25 50 75 100
OUTPUT LOAD – mA
Figure 8. Dropout Voltage vs.
Output Current
5
VOUT = 3.2V
RL = 32
4
3
2
1
0
01 234321 0
INPUT VOLTAGE – Volts
Figure 9. Power-Up/Power-Down
8.0
VIN
7.0
6.0
5.0
4.0 VOUT
3.0
2.0
1.0
0
0
VSD = VIN
CL = 0.47F
RL = 32
VOUT = 3.2V
20 40 60 80 100 120 140 160 180 200
TIME – s
Figure 10. Power-Up Overshoot
–4– REV. 0

4페이지










ADP3307ART-27 전자부품, 판매, 대치품
ADP3307
VIN
C1+
1F
NR
ADP3307-3.3
IN OUT
ERR
CNR
10nF
R1 330k +
EOUT
VOUT = 3.3V
C2
4.7F
ON
OFF
SD GND
Figure 21. Noise Reduction Circuit
Thermal Overload Protection
The ADP3307 is protected against damage due to excessive
power dissipation by its thermal overload protection circuit,
which limits the die temperature to a maximum of 165°C. Un-
der extreme conditions (i.e., high ambient temperature and
power dissipation), where die temperature starts to rise above
165°C, the output current is reduced until the die temperature
has dropped to a safe level. Output current is restored when the
die temperature is reduced.
Current and thermal limit protections are intended to protect
the device against accidental overload conditions. For normal
operation, device power dissipation should be externally limited
so that junction temperatures will not exceed 125°C.
Calculating Junction Temperature
Device power dissipation is calculated as follows:
PD = (VIN – VOUT) ILOAD + (VIN) IGND
Where ILOAD and IGND are load current and ground current, VIN
and VOUT are input and output voltages respectively.
Assuming ILOAD= 100 mA, IGND= 2 mA, VIN = 5.5 V and
VOUT = 3.3 V, device power dissipation is:
PD = (5.5 – 3.3) 0.1 + 5.5 × 2 mA = 0.231 W
T = TJ TA = PD × θJA = 0.231 × 165 = 38°C
With a maximum junction temperature of 125°C, this yields a
maximum ambient temperature of ~72°C.
Printed Circuit Board Layout Consideration
Surface mount components rely on the conductive traces or
pads to transfer heat away from the device. Appropriate PC
board layout techniques should be used to remove heat from the
immediate vicinity of the package.
The following general guidelines will be helpful when designing
a board layout:
1. PC board traces with larger cross section areas will remove
more heat. For optimum results, use PC boards with thicker
copper and wider traces.
2. Increase the surface area exposed to open air so heat can be
removed by convection or forced air flow.
3. Do not use solder mask or silkscreen on the heat dissipating
traces because it will increase the junction-to-ambient ther-
mal resistance of the package.
Shutdown Mode
Applying a TTL high signal to the shutdown pin or tying it to
the input pin will turn the output ON. Pulling the shutdown pin
down to a TTL low level or tying it to ground will turn the
output OFF. In shutdown mode, quiescent current is reduced
to less than 1 µA.
Error Flag Dropout Detector
The ADP3307 will maintain its output voltage over a wide
range of load, input voltage and temperature conditions. If the
output is about to lose regulation, for example, by reducing the
supply voltage below the combined regulated output and drop-
out voltages, the ERR pin will be activated. The ERR output is
an open collector that will be driven low.
Once set, the ERRor flag’s hysteresis will keep the output low
until a small margin of operating range is restored either by
raising the supply voltage or reducing the load.
APPLICATIONS CIRCUITS
Crossover Switch
The circuit in Figure 22 shows that two ADP3307s can be used
to form a mixed supply voltage system. The output switches
between two different levels selected by an external digital input.
Output voltages can be any combination of voltages from the
Ordering Guide of the data sheet.
VIN = 4V TO 12V
OUTPUT SELECT
4V
0V
IN OUT
ADP3307-2.7
SD
GND
VOUT = 2.7V/3.3V
C1 +
1.0F
IN OUT
ADP3307-3.3
SD
GND
+ C2
0.47F
Figure 22. Crossover Switch
Higher Output Current
The ADP3307 can source up to 100 mA without any heatsink
or pass transistor. If higher current is needed, an appropriate
pass transistor can be used, as in Figure 23, to increase the
output current to 1 A.
VIN = 4V TO 8V
C1
47F
MJE253*
R1
50
VOUT = 3.3V@1A
IN OUT
ADP3307-3.3
SD ERR
GND
+ C2
10F
*AAVID531002 HEAT SINK IS USED
Figure 23. High Output Current Linear Regulator
REV. 0
–7–

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ADP3307ART-27

High Accuracy anyCAP 100 mA Low Dropout Linear Regulator

Analog Devices
Analog Devices

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