AS2702AT-5.0 [SIPEX]
Fixed Positive LDO Regulator, 5V, 0.5V Dropout, PSSO3, TO-263, 3 PIN;型号: | AS2702AT-5.0 |
厂家: | SIPEX CORPORATION |
描述: | Fixed Positive LDO Regulator, 5V, 0.5V Dropout, PSSO3, TO-263, 3 PIN 输出元件 调节器 |
文件: | 总9页 (文件大小:145K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
AS2700/01/02
700mA Low Dropout Voltage Regulators
With Shutdown
(PRELIMINARY INFORMATION)
FEATURES
APPLICATIONS
• Output Current 700mA at 3.3V and 5V
• Internal Short Circuit Current Limit
• Dropout Voltage 0.5V at 700mA Output
• Extremely Tight Load and Line Regulation
• Very Low Temperature Coefficient
• Mirror Image Insertion Protection
• Unregulated DC Input Can Withstand -20V Reverse Battery
and +60V Positive Transients
• Battery Powered Systems
• Cordless Telephones
• Automotive Electronics
• Portable/ Palm Top / Notebook Computers
• Portable Consumer Equipment
• Portable Instrumentation
• SMPS Post-Regulator
• Voltage Reference
• Direct Replacement For LM2937 Socket
PRODUCT DESCRIPTION
The AS2700/01/02 are a low power positive voltage regulators. The AS2700/01/02 offers 700mA output current with a dropout
voltage of only 0.5V and over temperature dropout is up to 1V. The quiescent current is 10mA at differential output of 5V and output
current of 700mA. A higher quiescent current can exist when the device is in dropout mode (VIN -VOUT≤ 3V).
The regulator will automatically shut down to protect both the internal circuits and the load. This device also features short circuit and
thermal overload protection.
The AS2700/01/02 is offered in 3 and 5 pin TO-220, TO-263 and 3-pin SOT-223 packages compatible with other 5V and 3.3V
regulators, TO-263 and 3-pin SOT-223. The device is offered in standard output voltages of 5V and 3.3V as well as in adjustable
output regulator.
ORDERING INFORMATION
TO-220
TO-263
SOT-223
3-PIN
AS2700YM3-X
OPER.
3 / 5-PIN
3 / 5-PIN
TEMP. RANGE
-40 °C to +125°C
AS2700/01/02YU-X AS2700/01/02YT-X
X= Output Voltage (X = 3.3V, 5.0V)
Y = A or Blank for adjustable).
PIN CONNECTIONS
TO-220-3 (U)
TO-263-5 (T)
AS2700/01/02
TO-263-3 (T)
AS2700
TO-220-5 (U)
AS2701/02
SOT-223 (M3)
AS2700
Five Lead Package Pin Functions:
AS2701
AS2702
Adjust
Shutdown
GND
AS2700
1
2
3
1
3
2
2
1
3
4 5
1) Error
1
2 3 4
5
1
2
3
2) Input
3) GND
VIN
VOUT
GND
Top View
4) Output
5) Shutdown
Input
VIN
VOUT
GND
Output
Top View
Top View
VIN
VOUT
GND
Front View
Front View
Rev. 10/11/00
AS2700/01/02
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Lead Temp. (Soldering, 10 Seconds) .............................. 260°C
Feedback Input Voltage...................................... -1.5V to +30V
Shutdown Input Voltage..................................... -0.3V to +30V
Error Comparator Output ................................... -0.3V to +30V
Input Supply Voltage
Continuous .........................+12V
Transient................-20V to +60V
Storage Temperature Range .........................-65° to +150°C
Operating Junction Temperature Range ..... -40°C to +125°C
ESD Rating
.....................................2KV Min
ELECTRICAL CHARACTERISTICS at V = V + 5V, I = 700mA, C = 10 F, unless otherwise specified. Limits in
µ
O
O
Boldface type apply over the entire operating temperatuINre range. All Oother specifications are TA = 25°C.
Parameter
Conditions
Typ.
AS2700/01/02A
AS2700/01/02B
Max
Units
(Note 2)
Min Max Min
3.3V Version
Output Voltage
3.3
3.3
3.267
3.333
3.234
3.366
V
3.217
3.382
3.185
3.415
-40°C≤TJ≤+125°C
1mA≤ IL≤500mA
5V Version
Output Voltage
5.0
5.0
4.950
4.880
5.050
5.120
4.900
4.870
5.100
5.130
V
-40°C≤TJ≤+125°C
1mA≤ IL≤700mA
All Voltage Options
Output Voltage
20
0.03
0.04
60
100
150
ppm/°C
%max
%max
mV
Temperature Coefficient
Line Regulation (Note 3)
(Note1)
6V≤ VIN≤30V (Note4)
0.1
0.40
0.20
0.30
100
150
400
500
150
180
2
0.20
0.80
0.30
0.50
100
150
400
500
150
180
2
Load Regulation (Note 3)
Dropout Voltage (Note 5)
IL = 1 to 700
IL = 0.1 to 1mA
IL = 1mA
IL = 700mA
IL = 1mA
375
100
Ground Current
µA
4.5
15
mA
2.5
14
2.5
14
IL = 700mA
VOUT = 0
16
16
20
20
20
22
22
Current Limit
700
800
0.2
700
800
0.2
mA
Thermal Regulation
0.05
%/w
Output Noise, 10Hz to 100kHz
IL = 100mA
CL = 2.2µF
CL = 33µF
400
200
1.0
1.0
µV
0.60
0.60
Vrms
Adjustable Versions Only
Reference Voltage
Over Temperature
(Note 6)
1.235
1.210
1.200
1.185
1.260
1.270
1.285
40
1.200
1.980
1.185
1.270
1.272
1.285
60
V
Feedback Pin Bias Current
20
50
nA
60
80
Reference Voltage Temperature
Coefficient
(Note 7)
ppm/°C
NA/°C
Feedback Pin Bias Current
0.1
Temperature Coefficient
Rev. 10/11/00
AS2700/01/02
ELECTRICAL CHARACTERISTICS at V = V + 5V, I = 700mA, C = 22 F, unless otherwise specified. Limits in
µ
O
O
Boldface type apply over the entire operating temperatuINre range. All Oother specifications are TA = 25°C.
Parameter
Conditions
Typ.
AS2700/01/02A
AS2700/01/02B
Max
Units
Min Max Min
Error Comparator
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
VOH = 30V
0.01
150
60
1.00
2.00
250
400
1.00
2.00
250
400
µA
mV
mV
mV
mV
VIN = 4.5V
IOL = 400µA
(Note 8)
40
25
40
25
(Note 8)
(Note 8)
75
95
95
140
140
15
Shutdown Input
Input Logic Voltage
Low (Regulator ON)
High (Regulator OFF)
VS = 2.4V
0.7
0.7
V
2.0
2.0
Shutdown Pin Input Current
30
50
90
150
800
1000
15
µA
100
600
750
VS = 30V
450
3
Regulator Output Current In
Shutdown
10
20
µA
25
Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
Note 2: Unless otherwise specified all limits are guaranteed for Tj = 25°C, VIN = 6V, IL = 100µA and CL = 1µF. Additional conditions for the 8-pin versions are
feedback tied to 5V tap and output tied to output sense (VOUT = 5V) and VSHUTDOWN ≤ 0.8V.
Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are
covered under the specification for thermal regulation.
Note 4: Line regulation for the AS2700/01/02 is tested at 150°C for IL = 1 mA. For IL = 100µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See
typical performance characteristics for line regulation versus temperature and load current.
Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential at
very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.
Note 6: VREF ≤VOUT ≤ (Vin - 1V), 2.3 ≤Vin≤30V, 100µA≤IL≤ 250 mA, TJ ≤ TJMAX
.
Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To
express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmed output
voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of VOUT as
V
OUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
Note 8: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT =0, Feedback pin tied to 5V Tap.
Note 9: The junction -to-ambient thermal resistance of the TO-92 package is 180°C/ W with 0.4” leads and 160°C/ W with 0.25” leads to a PC board.
The thermal resistance of the 8-Pin DIP package is 105°C/W junction-to-ambient when soldered directly to a PC board. Junction-to-ambient thermal resistance for the
SOIC (S) package is 160°
UNREGULATED DC
5V @ 700mA
MAX
+
INPUT
FEEDBACK
OUTPUT
SENSE
5V TAP
Ω
180k ..
+
_
ERROR
AMPLIFIER
FROM
CMOS OR
TTL
330kΩ ..
SHUTDOWN
+
Ω
60k ..
µ
1
F..
+
+
_
______
60 mV
ERROR
ERROR DETECTION
COMPARATOR
TO CMOS OR
TTL
1.23V
+
REFERENCE
GROUND
AS2700/01/02 Block Diagram
Rev. 10/11/00
AS2700/01/02
APPLICATION HINTS
EXTERNAL CAPACITORS
high around 5V input (input voltage at which Vout = 4.75 ). Since
the AS2700/01/02’s dropout voltage is load dependent, the input
voltage trip point (around 5V) will vary with the load current. The
output voltage trip point (approx. 4.75V) does not vary with load.
The error comparator has an open-collector output, which requires an
external pull-up resistor. Depending on the system requirements the
resistor may be returned to 5V output or other supply voltage. In
determining the value of this resistor, note that the output is rated to
sink 250µA, this value adds to battery drain in a low battery
condition. Suggested values range from 100K to 1MΩ. If the output
is unused this resistor is not required.
The stability of the AS2700/01/02 requires a 10µF or greater
capacitor between output and ground. Oscillation could occur
without this capacitor. Most types of tantalum or aluminum
electrolytic works fine here. For operations below -25°C solid
tantalum is recommended since the many aluminum types have
electrolytes that freeze at about -30°C. The ESR of about 5Ω or less
and resonant frequency above 500 kHz are the most important
parameters in the value of the capacitor. The capacitor value may be
increased without limit.
At lower values of output current, less output capacitance is required
for stability. For the currents below 10mA the value of the capacitor
can be reduced to 22µF and 0.15µF for 1mA. More output
capacitance is needed for the 8-pin version at voltages below 5V
since it runs the error amplifier at lower gain. At worst case 22µF or
greater must be used for the condition of 750mA load at 1.23V
output.
PROGRAMMING THE OUTPUT VOLTAGE OF AS2700/01/02
The AS2700/01/02 may be programmed for any output voltage
between its 1.235V reference and its 30V maximum rating . As seen
in Figure 2, an external pair of resistors is required. Refer to the
below equation for the programming of the output voltage:
The AS2700/01/02, unlike other low dropout regulators will remain
stable and in regulation with no load in addition to the internal
voltage divider. This feature is especially important in applications
like CMOS RAM keep-alive. When setting the output voltage of the
AS2700/01/02 version with external resistors, a minimum load of
5mA is recommended. If there is more than 10 inches of wire
between the input and the AC filter capacitor or if a battery is used as
the input then a 1µA tantalum or aluminum electrolytic capacitor
should be placed from the input to the ground.
V
OUT = VREF × (1 + R1\ R2)+ IFBR1
The VREF is 1.235 and IFB is the feedback bias current, nominally -20
nA. The minimum recommended load current of 1µA forces an
upper limit of 1.2 MΩ on value of R2. If no load is presented the IFB
produces an error of typically 2% in VOUT, which may be eliminated
at room temperature by trimming R1. To improve the accuracy
choose the value of R2 = 100k this reduces the error by 0.17% and
increases the resistor program current by 12µA. Since the
AS2700/01/02 typically draws 100µA at no load with SHUTDOWN
open-circuited this is a small price to pay
ERROR DETECTION COMPARATOR OUTPUT
4.75V
REDUCING OUTPUT NOISE
OUTPUT
It may be an advantage to reduce the AC noise present at the output.
One way is to reduce the regulator bandwidth by increasing the size
of the output capacitor. This is the only way that noise can be
reduced on the 3 lead AS2700/01/02 but is relatively inefficient, as
increasing the capacitor from 1µF to 220µF only decreases the noise
from 430µV to 160µVRMS for a 100 kHz bandwidth at 5V output.
Noise could also be reduced fourfold by a bypass capacitor across R1,
since it reduces the high frequency gain from 4 to unity. Pick
VOLTAGE
_______
ERROR*
C
BYPASS ≅ 1 / 2πR1 × 200 Hz
+
+
5.0V
INPUT
VOLTAGE
or choose 0.01µF. When doing this, the output capacitor must be
increased to 3.3µF to maintain stability. These changes reduce the
output noise from 430µV to 100µVRMS for a 100 kHz bandwidth at
5V output. With the bypass capacitor added, noise no longer scales
with output voltage so that improvements are more dramatic at higher
+
1.3V
+
* See Application Info.
_______
Figure 1. ERROR Output Timing
output voltages.
SHUTDOWN
The Comparator produces
a
logic low output whenever the
VOUT
V
IN
AS2700/01/02 output falls out of regulation by more than around
5%. This is around 75mV offset divided by the 1.235 reference
voltage. This trip level remains 5% below normal regardless of the
programmed output voltage of the regulator. Figure 1 shows the
timing diagram depicting the ERROR signal and the regulator output
voltage as the AS2700/01/02 input is ramped up and down. The
ERROR signal becomes low at around 1.3V input, and goes
AS2702
GND
ADJ
Fig.2 Adjustable Voltage Regulator
Rev. 10/11/00
AS2700/01/02
TO-263-5L (T)
0.055 (1.397)
±
±
±
0.005 (4.470 0.127)
0.176
0.050
0.405 ± 0.005
0.127)
±
0.002
(1.270 0.051)
(10.287 ±
±
±
0.356
(9.042
0.005
0.127)
±
0.600 0.025
±
±
0.100
0.010
±
(15.24
0.635)
(2.540 0.254)
+
-
0.015
0.003
+
-
(0.381
0.074)
±
±
0.067
0.005
0.032 0.003
±
±
(1.702 0.127)
(0.813
0.076)
0° 8°
Rev. 10/11/00
AS2700/01/02
TO-263-3L (T)
(4.470 ±
0.127)
0.051)
0.176±
0.005
0.055 (1.397)
0.405 ±
0.005
0.050± 0.002 (1.270 ±
±
(10.287 0.127)
0.356 ± 0.005
±
(9.042 0.127)
0.600 +- 0.025
±
(15.24
0.635)
±
0.100 0.010
(2.540±
0.254)
+
0.003
-
0.015
0.103 BSC
(2.616)
0.050 (1.270)
(0.381 + 0.074)
-
0.032 +- 0.001
(0.813 +- 0.025)
0°
8°
Rev. 10/11/00
AS2700/01/02
TO-220-3L (U)
0.180 ± 0.005
(4.572 ± 0.127)
0.151D ± 0.002
(3.835 D ± 0.051)
0.408 ± 0.013
(10.36 ± 0.33)
0.050 ± 0.002
(1.270 ± 0.051)
0.110 ± 0.010
(2.794 ± 0.254)
0.250 ± 0.010
(6.350 ± 0.254)
Tapered 1o
2 Sides
0.340 ± 0.010
(8.636 ± 0.254)
SEATING PLANE
1.020 ± 0.015
(25.910 ± 0.381)
0.150 MIN
(3.81 MIN)
7o Typ.
0.540 ± 0.015
(13.720 ± 0.381)
0.410
(10.41)
0.050 TYP
(1.27 TYP)
0.200 ± 0.010
(5.080 ± 0.254)
0.015 ± 0.010/-0.015
(2.667± 0.254/-0.381)
0.100 ± 0.010
(2.540 ± 0.254)
0.015 ± 0.010/-0.002
(0.381± 0.254/-0.051)
0.032 ± 0.005
(0.813 ± 0.127)
Rev. 10/11/00
AS2700/01/02
TO-220-5L (U)
+
0.150 D 0.005
-
+
-
0.175
(4.45
0.005
0.13)
+
(3.81D
0.13)
-
+
-
+
0.400
(10.16
0.005
0.13)
-
+
-
+
0.050
(1.27
0.005
0.13)
-
+
-
+
-
0.108
(2.74
0.005
2.74)
+
-
+
0.250
(6.35
0.005
0.13)
-
+
-
+
+
-
0.590
(14.99
0.005
0.13)
-
SEATING
PLANE
1.137 REF
(28.88 REF)
7°
Typ.
+
-
0.547
(13.89
0.005
0.005)
+
-
+
+
-
0.067
(1.70
0.005
0.105
(2.67
0.005
0.13)
-
+
0.032
(0.81
0.005
0.13)
-
+
+
-
0.127)
-
+
-
0.268 REF
(6.81 REF)
+
0.268 REF
0.015
(0.38
0.005
0.13)
-
+
-
Rev. 10/11/00
AS2700/01/02
SOT-223-3L (M3)
0.124
0.116
0.146 0.295
0.130 0.264
0.041
0.033
0.0905 NOM
0.181 NOM
0.146
0.130
°
16 C
°
10 C
0.264
0.248
0.0040
0.0008
0.014
0.010
°
16 C
10 C Max
°
16
°
C
0.033
0.025
10
°
C
Rev. 10/11/00
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