ADP3300ART-3 [ADI]
High Accuracy anyCAP 50 mA Low Dropout Linear Regulator; 高精度公司的anyCAP 50毫安低压差线性稳压器型号: | ADP3300ART-3 |
厂家: | ADI |
描述: | High Accuracy anyCAP 50 mA Low Dropout Linear Regulator |
文件: | 总8页 (文件大小:131K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
®
High Accuracy anyCAP
a
50 mA Low Dropout Linear Regulator
ADP3300
FUNCTIONAL BLOCK DIAGRAM
FEATURES
High Accuracy (Over Line and Load Regulations
at 25؇C): ؎0.8%
Ultralow Dropout Voltage: 80 mV Typical @ 50 mA
Requires Only CO = 0.47 F for Stability
anyCAP™ = Stable with All Types of Capacitors
(Including MLCC)
Current and Thermal Limiting
Low Noise
Dropout Detector
ADP3300
Q1
OUT
IN
R1
R2
THERMAL
PROTECTION
CC
ERR
DRIVER
GND
Q2
Gm
SD
BANDGAP
REF
Low Shutdown Current: 1 A
3.0 V to 12 V Supply Range
–40؇C to +85؇C Ambient Temperature Range
Several Fixed Voltage Options
Ultrasmall SOT-23 6-Lead Package
Excellent Line and Load Regulations
APPLICATIONS
Cellular Telephones
Notebook, Palmtop Computers
Battery Powered Systems
PCMCIA Regulators
Bar Code Scanners
Camcorders, Cameras
2
NR
ADP3300-5
5
V
IN
4
OUT
V
= +5V
IN
OUT
R1
330kΩ
C2
0.4
C1
F
F
0.4
6
E
OUT
GENERAL DESCRIPTION
1
3
The ADP3300 is a member of the ADP330x family of precision
low dropout anyCAP™ voltage regulators. The ADP3300
stands out from 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 capacitor, regardless of its ESR (Equivalent Series Resistance)
value, including ceramic types (MLCC) for space restricted appli-
cations. The ADP3300 achieves exceptional accuracy of 0.8%
at room temperature and 1.4% overall accuracy over tempera-
ture, line and load regulations. The dropout voltage of the
ADP3300 is only 80 mV (typical) at 50 mA.
ON
OFF
GND
Figure 1. Typical Application Circuit
LDO family offers a wide range of output voltages and output
current levels from 50 mA to 200 mA:
ADP3301 (100 mA)
ADP3302 (100 mA, Dual Output)
ADP3303 (200 mA)
The ADP3300 operates with a wide input voltage range from
3.0 V to 12 V and delivers a load current in excess of 50 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™
anyCAP is a registered trademark of Analog Devices Inc.
REV. A
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
Fax: 781/326-8703
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 2000
(@ TA = –40؇C to +85؇C, VIN = 7 V, CIN = 0.47 F, COUT = 0.47 F, unless otherwise
ADP3300–SPECIFICATIONS noted)
Parameter
Symbol
Conditions
Min
Typ
Max
Units
OUTPUT VOLTAGE
ACCURACY
VOUT
VIN = VOUT(NOM) +0.3 V to 12 V
IL = 0.1 mA to 50 mA
TA = +25°C
–0.8
–1.4
+0.8
+1.4
%
%
V
IN = VOUT(NOM) +0.3 V to 12 V
IL = 0.1 mA to 50 mA
LINE REGULATION
LOAD REGULATION
GROUND CURRENT
∆VO
VIN = VOUT(NOM) +0.3 V to 12 V
TA = +25°C
∆VIN
0.02
0.06
mV/V
∆VO
∆IL
IL = 0.1 mA to 50 mA
TA = +25°C
mV/mA
IGND
IL = 50 mA
IL = 0.1 mA
0.55
0.19
1.7
0.3
mA
mA
GROUND CURRENT
IN DROPOUT
IGND
VIN = 2.5 V
IL = 0.1 mA
0.6
1.2
mA
DROPOUT VOLTAGE
VDROP
VOUT = 98% of VOUT(NOM)
IL = 50 mA
0.08
0.025
0.004
0.17
0.07
0.03
V
V
V
IL = 10 mA
IL = 1 mA
SHUTDOWN THRESHOLD
VTHSD
ISDIN
IQ
ON
OFF
2.0
0.75
0.75
V
V
0.3
SHUTDOWN PIN
INPUT CURRENT
0 < VSD ≤ 5 V
5 < VSD ≤ 12 V @ VIN = 12 V
1
22
µA
µA
GROUND CURRENT IN
SHUTDOWN MODE
VSD = 0, VIN = 12 V
TA = +25°C
0.005
0.01
1
3
µA
µA
V
SD = 0, VIN = 12 V
TA = +85°C
OUTPUT CURRENT IN
SHUTDOWN MODE
IOSD
TA = +25°C @ VIN = 12 V
TA = +85°C @ VIN = 12 V
2
4
µA
µA
ERROR PIN OUTPUT
LEAKAGE
IEL
VEO = 5 V
13
µA
ERROR PIN OUTPUT
“LOW” VOLTAGE
VEOL
ISINK = 400 µA
0.12
100
0.3
V
PEAK LOAD CURRENT
ILDPK
VNOISE
VIN = VOUT(NOM) + 1 V
mA
OUTPUT NOISE
@ 5 V OUTPUT
f = 10 Hz–100 kHz
C
NR = 0
100
30
µV rms
µV rms
CNR = 10 nF, CL = 10 µF
NOTE
Ambient temperature of +85°C corresponds to a typical junction temperature of +125°C under typical full load test conditions.
Specifications subject to change without notice.
REV. A
–2–
ADP3300
ABSOLUTE MAXIMUM RATINGS*
PIN FUNCTION DESCRIPTIONS
Input Supply Voltage . . . . . . . . . . . . . . . . . . . . –0.3 V to +16 V
Shutdown Input Voltage . . . . . . . . . . . . . . . . . –0.3 V to +16 V
Error Flag Output Voltage . . . . . . . . . . . . . . . . –0.3 V to +16 V
Noise Bypass Pin Voltage . . . . . . . . . . . . . . . . . –0.3 V to +5 V
Power Dissipation . . . . . . . . . . . . . . . . . . . . Internally Limited
Operating Ambient Temperature Range . . . . –55°C to +125°C
Operating Junction Temperature Range . . . . –55°C to +125°C
θJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165°C
θJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering 10 sec) . . . . . . . . +300°C
Vapor Phase (60 sec ) . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
Pin Mnemonic Function
1
2
GND
NR
Ground Pin.
Noise Reduction Pin. Used for further
reduction of the output noise (see text for
details). No connection if not used.
3
4
SD
Active Low Shutdown Pin. Connect to
ground to disable the regulator output.
When shutdown is not used, this pin should
be connected to the input pin.
OUT
Output of the Regulator, fixed 2.7, 3.0, 3.2,
3.3 or 5 volts output voltage. Bypass to
ground with a 0.47 µF or larger capacitor.
*This is a stress rating only; operation beyond these limits can cause the device to
be permanently damaged.
5
6
IN
Regulator Input.
PIN CONFIGURATION
ERR
Open Collector Output which goes low to
indicate that the output is about to go out
of regulation.
ERR
IN
1
2
3
6
5
4
GND
NR
ADP3300
TOP VIEW
(Not to Scale)
SD
OUT
ORDERING GUIDE
Package Description
Model
Voltage Output
Package Options
Branding Information
ADP3300ART-2.7
ADP3300ART-3
ADP3300ART-3.2
ADP3300ART-3.3
ADP3300ART-5
2.7 V
3.0 V
3.2 V
3.3 V
5.0 V
Surface Mount
Surface Mount
Surface Mount
Surface Mount
Surface Mount
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
SOT-23-6
LAB
LBB
LCB
LDB
LEB
Contact the factory for the availability of other output voltage options.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP3300 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. A
–3–
ADP3300–Typical Performance Characteristics
3.202
3.202
3.201
3.200
3.199
3.198
3.197
800
640
480
I
= 0mA
L
V
V
= 3.2V
OUT
= 7V
3.201
3.200
V
= 3.2V
OUT
= 0mA
IN
I
L
I
= 10mA
= 50mA
L
3.199
3.198
3.197
3.196
V
= 3.2V
OUT
320
160
0
I
L
\
3.196
3.195
0
8
16 24 32 40 48 56 64 72 80
3.3
4
5
6
7
8
9
10 11 12 13 14
0
1.2 2.4 3.6 4.8 6.0 7.2 8.4 9.6 10.8 12.0
OUTPUT LOAD – mA
INPUT VOLTAGE – Volts
INPUT VOLTAGE – Volts
Figure 3. Output Voltage vs. Load
Current
Figure 2. Line Regulation Output
Voltage vs. Supply Voltage
Figure 4. Quiescent Current vs.
Supply Voltage
0.2
0.1
0.0
820
700
V
= 7V
IN
600
500
400
300
200
690
560
I
= 50mA
L
I
= 0 – 50mA
L
–0.1
–0.2
–0.3
–0.4
430
I
V
= 0 TO 80mA
L
I
= 0mA
L
= 7V
IN
300
170
100
0
–45 –25 –5 15 35 55 75 95 115 135
TEMPERATURE
–45 –25 –5 15 35 55 75 95 115 135
TEMPERATURE
0
20
40
60
80
C
C
OUTPUT LOAD – mA
Figure 6. Output Voltage Variation %
vs. Temperature
Figure 7. Quiescent Current vs.
Temperature
Figure 5. Quiescent Current vs. Load
Current
5
8.0
120
96
72
48
24
0
V
R
= 3.2V
V
OUT
= 64Ω
IN
7.0
6.0
5.0
4.0
L
4
3
2
1
0
V
OUT
3.0
2.0
1.0
0
R
= 33Ω
L
V
= V
IN
SD
C
R
= 0.47µF
= 66Ω
L
L
V
= 3.3V
OUT
0
1
2
3
4
3
2
1
0
0
20 40 60 80 100 120 140 160 180 200
0
20
40
60
80
INPUT VOLTAGE – Volts
TIME – µs
OUTPUT LOAD – mA
Figure 9. Power-Up/Power-Down
Figure 10. Power-Up Overshoot
Figure 8. Dropout Voltage vs. Output
Current
REV. A
–4–
ADP3300
3.220
3.205
3.200
3.220
3.210
3.200
3.190
3.180
3.220
3.210
3.200
3.190
3.180
V
= 3.2V
V
C
= 3.2V
= 0.47µF
V
= 3.2V
OUT
OUT
OUT
L
3.195
3.190
R
C
= 64Ω
= 0.47µF
L
L
R
C
= 3.2kΩ
= 0.47µF
L
L
I
= 50mA
OUT
50
1
7.5
7.0
7.5
7.0
V
IN
1mA
0
200
400
TIME – µs
600
800
1000
180 200
0
20 40 60 80 100 120 140 160
0
20 40 60 80 100 120 140 160 180 200
TIME – µs
TIME – µs
Figure 13. Load Transient
Figure 12. Line Transient Response
Figure 11. Line Transient Response
4
3
2
1
3.220
V
= 3.0V
OUT
3.0
0
V
C
= 3.2V
OUT
= 4.7µF
V
V
OUT
OUT
C
= 0.47µF
L
L
3.205
3.200
3.2V
200
150
100
50
C
= 4.7µF
V
3.195
3.190
L
= 3.2V
OUT
= 64Ω
R
L
I
OUT
V
0
+3
I
= 50mA
OUT
400
V
50
1
= 7V
4
+3V
0
IN
1mA
800
0
0
20
40
TIME
60
s
80
100
0
1
2
3
5
0
200
600
TIME – µs
1000
TIME – sec
Figure 16. Turn On
Figure 15. Short Circuit Current
Figure 14. Load Transient
10
1
0
4
3
2
1
0
0.47µF BYPASS
PIN 5 TO PIN 1
V
= 3.3V
b
3.2V
OUT
V
R
C
= 3.2V
= 64Ω
= 0.47µF
a. 0.47µF, R = 33kΩ
OUT
L
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
L
L
b. 0.47µF, R = 64Ω
L
V
= 5V, CL = 0.47µF,
OUT
IL = 1mA, CNR = 0
c. 4.7µF, R = 33kΩ
L
d. 4.7µF, R = 64Ω
L
V
= 3.3V, CL = 0.47µF,
OUT
IL = 1mA, CNR = 0
d
a
0.1
V
= 2.7-5.0V, CL = 0.47µF,
c
OUT
b
d
IL = 1mA, CNR = 10nF
3
0
V
V
= 2.7-5.0V, CL = 0.47µF,
L = 1mA, CNR = 10nF
OUT
I
a c
0.01
100
10
100
1k
10k 100k
FREQUENCY – Hz
10M
1M
1k
10k
100k
0
20
40
60
80
100
FREQUENCY – Hz
TIME – µs
Figure 18. Power Supply Ripple
Rejection
Figure 19. Output Noise Density
Figure 17. Turn Off
REV. A
–5–
ADP3300
THEORY OF OPERATION
be stable with just a small 0.47 µF capacitor on the output.
Additional advantages of the pole splitting scheme include superior
line noise rejection and very high regulator gain, which leads to
excellent line and load regulation. An impressive 1.4% accuracy is
guaranteed over line, load and temperature.
The new anyCAP™ LDO ADP3300 uses a single control loop
for regulation and reference functions. The output voltage is
sensed by a resistive voltage divider consisting of R1 and R2
which is varied to provide the available output voltage option.
Feedback is taken from this network by way of a series diode
(D1) and a second resistor divider (R3 and R4) to the input of
an amplifier.
Additional features of the circuit include current limit, thermal
shutdown and noise reduction. Compared to the standard
solutions that give warning after the output has lost regula-
tion, the ADP3300 provides improved system performance by
enabling the ERR pin to give warning before the device loses
regulation.
OUTPUT
R1
INPUT
Q1
COMPENSATION
CAPACITOR
ATTENUATION
(V /V
As the chip’s temperature rises above 165°C, the circuit
activates a soft thermal shutdown, indicated by a signal low
on the ERR pin, to reduce the current to a safe level.
)
BANDGAP OUT
D1
R3
PTAT
OS
(a)
NONINVERTING
WIDEBAND
DRIVER
V
Gm
PTAT
CURRENT
R2
R
LOAD
To reduce the noise gain of the loop, the node of the main
divider network (a) is made available at the noise reduction (NR)
pin, which can be bypassed with a small capacitor (10 nF–100 nF).
R4
C
LOAD
ADP3300
APPLICATION INFORMATION
Capacitor Selection: anyCAP™
Output Capacitors: as with any micropower device, output
transient response is a function of the output capacitance. The
ADP3300 is stable with a wide range of capacitor values, types
and ESR (anyCAP™). A capacitor as low as 0.47 µF is all that is
needed for stability. However, larger capacitors can be used if
high output current surges are anticipated. The ADP3300 is
stable with extremely low ESR capacitors (ESR ≈ 0), such as
multilayer ceramic capacitors (MLCC) or OSCON.
Figure 20. Functional Block Diagram
A very high gain error amplifier is used to control this loop. The
amplifier is constructed in such a way that at equilibrium it
produces a large, temperature proportional input “offset voltage”
that is repeatable and very well controlled. The temperature-
proportional offset voltage is combined with the complimentary
diode voltage to form a “virtual bandgap” voltage, implicit in
the network, although it never appears explicitly in the circuit.
Ultimately, this patented design makes it possible to control the
loop with only one amplifier. This technique also improves the
noise characteristics of the amplifier by providing more flexibil-
ity on the trade-off of noise sources that leads to a low noise design.
Input Bypass Capacitor: an input bypass capacitor is not
required; however, for applications where the input source is
high impedance or far from the input pins, a bypass capacitor is
recommended. Connecting a 0.47 µF capacitor from the input
to ground reduces the circuit’s sensitivity to PC board layout. If
a bigger output capacitor is used, the input capacitor should be
1 µF minimum.
The R1, R2 divider is chosen in the same ratio as the bandgap
voltage to the output voltage. Although the R1, R2 resistor
divider is loaded by the diode D1 and a second divider consist-
ing of R3 and R4, the values are chosen to produce a tempera-
ture stable output. This unique arrangement specifically corrects
for the loading of the divider so that the error resulting from
base current loading in conventional circuits is avoided.
Noise Reduction
A noise reduction capacitor (CNR) can be used to further reduce
the noise by 6 dB–10 dB (Figure 21). Low leakage capacitors in
the 10 nF–100 nF range provide the best performance. For load
current less than 200 µA, a 4.7 µF output capacitor provides the
lowest noise and the best overall performance. Since the noise
reduction pin (NR) is internally connected to a high impedance
node, any connection to this node should be carefully done to
avoid noise pickup from external sources. The pad connected to
this pin should be as small as possible. Long PC board traces
are not recommended.
The patented amplifier controls a new and unique noninverting
driver that drives the pass transistor, Q1. The use of this special
noninverting driver enables the frequency compensation to
include the load capacitor in a pole splitting arrangement to
achieve reduced sensitivity to the value, type and ESR of the
load capacitance.
Most LDOs place strict requirements on the range of ESR
values for the output capacitor because they are difficult to
stabilize due to the uncertainty of load capacitance and resis-
tance. Moreover, the ESR value, required to keep conventional
LDOs stable, changes depending on load and temperature.
These ESR limitations make designing with LDOs more
difficult because of their unclear specifications and extreme
variations over temperature.
2
NR
C
10nF
NR
ADP3300-5
4
6
OUT
V
= +5V
OUT
V
IN
5
IN
+
+
C1
F
C2
4
330kΩ
1.
F
E
OUT
3
1
ON
OFF
This is no longer true with the ADP3300 anyCAP™ LDO. It
can be used with virtually any capacitor, with no constraint on
the minimum ESR. The innovative design allows the circuit to
GND
Figure 21. Noise Reduction Circuit
REV. A
–6–
ADP3300
Thermal Overload Protection
Error Flag Dropout Detector
The ADP3300 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.
Under extreme conditions (i.e., high ambient temperature and
high power dissipation), where die temperature starts to rise
above 165°C, the output current is reduced until die tempera-
ture has dropped to a safe level. Output current is restored when
the die temperature is reduced.
The ADP3300 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 dropout
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.
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.
APPLICATION CIRCUITS
Crossover Switch
The circuit in Figure 22 shows that two ADP3300s 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.
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.
OUT
ADP3300-5.0
V
= 5.5V TO 12V
IN
V
= 5V/3.3V
IN
Assuming ILOAD = 50 mA, IGND = 0.5 mA, VIN = 8 V and
OUT
VOUT = 3.3 V, device power dissipation is:
OUTPUT SELECT
5.0V
0V
PD = (8 – 3.3) 0.05 + 8 × 0.5 mA = 0.239 W
GND
∆T = TJ – TA = PD × θJA = 0.239 × 165 = 39.4°C
OUT
IN
With a maximum junction temperature of 125°C, this yields a
maximum ambient temperature of 85°C.
C1
F
C2
1
ADP3300-3.3
GND
0.4
F
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.
Figure 22. Crossover Switch
Higher Output Current
If higher current is needed, an appropriate pass transistor can be
used, as in Figure 23, to increase the output current to 1 A.
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.
MJE253*
V
= 6V TO 8V
V
= 5V @ 1A
OUT
IN
R1
50Ω
C1
F
4
2. Increase the surface area exposed to open air so heat can be
removed by convection or forced air flow.
IN
OUT
3. Do not use solder mask or silkscreen on the heat dissipating
traces because it will increase the junction to ambient thermal
resistance of the package.
C2
1
F
ADP3300-5
Shutdown Mode
GND
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 0.3 V or below, or tying it to ground, will turn the
output OFF. In shutdown mode, quiescent current is reduced
to less than 1 µA.
*AAVID531002 HEAT SINK IS USED
Figure 23. High Output Current Linear Regulator
REV. A
–7–
ADP3300
Constant Dropout Post Regulator
dropout voltage, which limits the power dissipation of the
LDO to 15 mW. The ADP3000 used in this circuit is a
switching regulator in the step-up configuration.
The circuit in Figure 24 provides high precision with low dropout
for any regulated output voltage. It significantly reduces the
ripple from a switching regulator while providing a constant
D1
1N5817
L1
6
H
ADP3300-5
V
= 2.5V TO 3.5V
IN
OUT
5V @ 50mA
F
IN
C1
F
10V
R1
C2
100µF
10V
10
GND
C3
2
R2
120Ω
30.1kΩ
1%
I
V
LIM
IN
SW1
Q1
2N3906
Q2
2N3906
ADP3000-ADJ
FB
GND
SW2
R3
R4
274kΩ
124kΩ
1%
Figure 24. Constant Dropout Post Regulator
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
6-Lead Surface Mount Package
(SOT-23)
0.122 (3.10)
0.106 (2.70)
6
1
5
2
4
3
0.071 (1.80)
0.059 (1.50)
0.118 (3.00)
0.098 (2.50)
PIN 1
0.037 (0.95) BSC
0.075 (1.90)
BSC
0.051 (1.30)
0.035 (0.90)
0.057 (1.45)
0.035 (0.90)
10°
0°
0.020 (0.50)
0.010 (0.25)
0.022 (0.55)
0.014 (0.35)
0.059 (0.15)
0.000 (0.00)
SEATING
PLANE
0.009 (0.23)
0.003 (0.08)
–8–
REV. A
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