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ADP3334 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 ADP3334은 전자 산업 및 응용 분야에서
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부품번호 ADP3334 기능
기능 High Accuracy Low IQ/ 500 mA anyCAP Adjustable Low Dropout Regulator
제조업체 Analog Devices
로고 Analog Devices 로고


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ADP3334 데이터시트, 핀배열, 회로
a High Accuracy Low IQ, 500 mA
anyCAP® Adjustable Low Dropout Regulator
FEATURES
High Accuracy Over Line and Load: ؎0.9% @ 25؇C,
؎1.8% over Temperature
Ultralow Dropout Voltage: 200 mV (Typ) @ 500 mA
Requires Only CO = 1.0 F for Stability
anyCAP = Stable with Any Type of Capacitor
(Including MLCC)
Current and Thermal Limiting
Low Noise
Low Shutdown Current: < 1.0 A (Typ)
2.6 V to 11 V Supply Range
1.5 V to 10 V Output Range
–40؇C to +85؇C Ambient Temperature Range
Thermally-Enhanced 8-Lead SO Package
APPLICATIONS
Cellular Phones
Camcorders, Cameras
Networking Systems, DSL/Cable Modems
Cable Set-Top Boxes
DSP Supplies
Personal Digital Assistants
ADP3334
FUNCTIONAL BLOCK DIAGRAM
IN Q1
THERMAL
PROTECTION
CC
DRIVER
SD
ADP3334
OUT
gm
BANDGAP
REF
FB
GND
GENERAL DESCRIPTION
The ADP3334 is a member of the ADP333x family of precision
low dropout anyCAP voltage regulators. The ADP3334 operates
with an input voltage range of 2.6 V to 11 V and delivers a
continuous load current up to 500 mA. The novel anyCAP
www.DaatarcShhieteect4tuUr.ecormequires only a very small 1 µF output capacitor for
stability, and the LDO is insensitive to the capacitor’s equiva-
lent series resistance (ESR). This makes ADP3334 stable with any
capacitor, including ceramic (MLCC) types for space restricted
applications.
The ADP3334 achieves exceptional accuracy of ± 0.9% at room
temperature and ± 1.8% over temperature, line, and load. The
dropout voltage of the ADP3334 is only 200 mV (typical) at
500 mA. This device also includes a safety current limit, ther-
mal overload protection and a shutdown feature. In shutdown
mode, the ground current is reduced to less than 1 µA. The
ADP3334 has low quiescent current 90 µA (typical) in light
load situations.
VIN
CIN
1F
ADP3334
I N OUT
I N OUT
SD
OFF
ON
FB
GND
R1 CNR
R2
VOUT
COUT
1F
Figure 1. Typical Application Circuit
The ADP3334 also features ADI’s thermally enhanced Thermal
Coastline package. This allows 1 W of power dissipation without
any external heat sinking.
anyCAP is a registered 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 that
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
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001




ADP3334 pdf, 반도체, 판매, 대치품
ADP3334Typical Performance Characteristics
2.202
2.201 IL = 0
VOUT = 2.2V
2.200
2.199
150mA
2.198
2.197
2.196
300mA
2.195
2.194
2
500mA
4 6 8 10
INPUT VOLTAGE Volts
12
TPC 1. Line Regulation Output
Voltage vs. Supply Voltage
2.201
2.200
VOUT = 2.2V
VIN = 6V
2.199
2.198
2.197
2.196
2.195
2.194
2.193
0
100 200 300 400
OUTPUT LOAD mA
500
TPC 2. Output Voltage vs. Load
Current
140
IL = 100A
120
VOUT = 2.2V
100
80
60 IL = 0
40
20
0
0 24
6 8 10 12
INPUT VOLTAGE – Volts
TPC 3. Ground Current vs. Supply
Voltage
5.0
VIN = 6V
VOUT = 2.2V
4.0
3.0
2.0
1.0
0
0
100 200
300 400 500
OUTPUT LOAD mA
TPC 4. Ground Current vs. Load
Current
0.5
0
0.4
300mA
0.3
0.2
0.1
500mA
0
0.1 500mA
0.2
0
50 25 0
25 50 75 100 125 150
JUNCTION TEMPERATURE ؇C
TPC 5. Output Voltage Variation %
vs. Junction Temperature
8
IL = 500mA
7
6
VIN = 6V
VOUT = 2.2V
5
300mA
4
3
2 100mA
1 50mA
0
0
50 25 0 25 50 75 100 125
JUNCTION TEMPERATURE ؇C
150
TPC 6. Ground Current vs. Junction
Temperature
www.D2a5t0aSheet4U.com
VOUT = 2.2V
200
150
100
50
0
0 100 200 300 400 500
OUTPUT LOAD mA
TPC 7. Dropout Voltage vs.
Output Current
VOUT = 2.2V
3.0 SD = GND
2.5 RL = 4.4
2.0
1.5
1.0
0.5
0
1234
TIME Sec
TPC 8. Power-Up/Power-Down
3
2 COUT = 1F
1
0
4
2
0
COUT = 10F
VOUT = 2.2V
SD = GND
RL = 4.4
200 400 600 800
TIME s
TPC 9. Power-Up Response
–4– REV. 0

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ADP3334 전자부품, 판매, 대치품
ADP3334
In order to have the lowest possible sensitivity of the output
voltage to temperature variations, it is important that the paral-
lel resistance of R1 and R2 is always 50 k.
R1 ×
R1 +
R2
R2
=
50
k
Also, for the best accuracy over temperature the feedback volt-
age should be set for 1.178 V:
VFB
= VOUT
×

R2
R1+ R2
where VOUT is the desired output voltage and VFB is the virtual
bandgapvoltage. Note that VFB does not actually appear at the
FB pin due to loading by the internal PTAT current.
Combining the above equations and solving for R1 and R2 gives
the following formulas:
R1 = 50 kΩ × VOUT
VFB
R2 = 50 k
1
VFB
VOUT

Table I. Feedback Resistor Selection
VOUT (V) R1(1% Resistor) (kΩ) R2 (1% Resistor) (kΩ)
1.5 63.4
232
1.8 76.8
147
2.2 93.1
107
2.7 115
88.7
3.3 140
www.Da5taSheet4U.com210
78.7
64.9
10 422
56.2
Thermal Overload Protection
The ADP3334 is protected against damage from excessive power
dissipation by its thermal overload protection circuit which limits
the die temperature to a maximum of 165°C. Under 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. The output current is restored when the die tempera-
ture 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 150°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 = 400 mA, IGND = 4 mA, VIN = 5.0 V and
VOUT = 2.8 V, device power dissipation is:
PD = (5 2.8) 400 mA + 5.0 (4 mA) = 900 mW
The proprietary package used in the ADP3334 has a thermal
resistance of 86.6°C/W, significantly lower than a standard
SOIC-8 package. Assuming a 4-layer board, the junction tem-
perature rise above ambient temperature will be approximately
equal to:
TJA = 0.900 W × 86.6oC /W = 77.9oC
To limit the maximum junction temperature to 150°C, maxi-
mum allowable ambient temperature will be:
TAMAX = 150°C 77.9°C/W = 72.1°C
Printed Circuit Board Layout Consideration
All surface mount packages rely on the traces of the PC board to
conduct heat away from the package.
In standard packages the dominant component of the heat resis-
tance path is the plastic between the die attach pad and the
individual leads. In typical thermally enhanced packages one or
more of the leads are fused to the die attach pad, significantly
decreasing this component. To make the improvement mean-
ingful, however, a significant copper area on the PCB must be
attached to these fused pins.
The patented thermal coastline lead frame design of the ADP3334
uniformly minimizes the value of the dominant portion of the
thermal resistance. It ensures that heat is conducted away by all
pins of the package. This yields a very low 86.6°C/W thermal
resistance for an SOIC-8 package, without any special board
layout requirements, relying only on the normal traces connected
to the leads. This yields a 15% improvement in heat dissipation
capability as compared to a standard SOIC-8 package. The
thermal resistance can be decreased by, approximately, an addi-
tional 10% by attaching a few square cm of copper area to the
IN or OUT pins of the ADP3334 package.
It is not recommended to use solder mask or silkscreen on the
PCB traces adjacent to the ADP3334s pins since it will increase
the junction-to-ambient thermal resistance of the package.
Shutdown Mode
Applying a TTL high signal to the shutdown (SD) pin or tying
it to the input pin, will turn the output OFF. Pulling SD down
to 0.4 V or below, or tying it to ground will turn the output ON.
In shutdown mode, quiescent current is reduced to much less
than 1 µA.
REV. 0
–7–

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