SIPEX SPX2920T3-5.0

SPX2920
®
400mA Low Drop Out Voltage Regulator with Shutdown
FEATURES
8
+VIN
■ Output 3.3V, 5.0V, at 400mA Output
1.2V to 20V
1
+VIN
VOUT
+
100K
■ Very Low Quiescent Current
SPX2920
■ Low Dropout Voltage
SHUTDOWN
INPUT
■ Extremely Tight Load And Line Regulation
3
VREF
4
ON
0.01µF
10µF
ERROR
5
GND
OFF
■ Very Low Temperature Coefficient
7
FB
______
ERROR
SD
R1
OUTPUT
R2
■ Current & Thermal Limiting
Adjustable Regulator
■ Error Flag Warns Of Output Dropout
(for SO-8)
■ Logic-Controlled Electronic Shutdown
(for SO-8)
5V
VIN
OUT
IN
SPX2920
■ Output Programmable From 1.24V to 20V
(for SO-8)
+
+
0.1 µF
2.2 µF
GND
■ Equivalent Replacement for MIC2920A and
MIC2904
IG
5V Regulator Circuit
DESCRIPTION
The SPX2920 is a low power voltage regulator. This device is an excellent choice for use in battery-powered
applications such as cordless telephones, radio control systems, and portable computers. The SPX2920
features very low quiescent current (140µA Typ.) and very low dropout voltage. This includes a tight initial
tolerance of 1% max and very low output temperature coefficient, making the SPX2920 useful as a lowpower voltage reference.
The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling
voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the
regulator to be switched on and off. The SPX2920 is offered in 3-pin TO-220 package, SO-8 (same pin
out as SPX2951), SOT-223, and surface mount and 3-pin TO-263 packages.
The regulator output voltage (of the SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed from
1.24V to 20V with an external pair of resistors.
TO-220-3 (U)
SPX2920
SPX2920
1
2
8-Pin Surface Mount
TO-263-3 (T)
1
2
3
SOT-223 (M3)
VOUT
1
8
VIN
SENSE
2
7
FEEDBACK
SHUTDOWN
3
SPX2920
VIN GND
4
5
2
3
5V/ 3.3V TAP
3
GND
SPX2920
1
6
ERROR
VIN GND VOUT
VOUT
VIN GND VOUT
Front View
Rev: A Date: 03/30/04
Top View
Top View
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
1
Top View
©Copyright 2004 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
Feedback Input Voltage .................................................... -1.5V to +20V
Shutdown Input Voltage .................................................... -0.3V to +20V
Error Comparator Output .................................................. -0.3V to +20V
ESD Rating ....................................................................................... 2kV
Power Dissipation ........................................................ Internally Limited
Lead Temp. (Soldering, 5 Seconds) ............................................. 260°C
Storage Temperature Range ........................................ -65°C to +150°C
Operating Junction Temperature Range ....................... -40°C to +125°C
Input Supply Voltage ......................................................... -20V to +20V
ELECTRICAL CHARACTERISTICS
Electrical characteristics at VIN =VO +1V, IO = 1mA, COUT = 2.2µF, TA = 25°C, unless otherwise specified. Boldface applies
over the full operating temperature range.
PARAMETER
CONDITIONS
(Note 2)
TYP
MIN
MAX
UNITS
3.3
3.3
3.267
3.217
3.333
3.382
V
1mA ≤ IL ≤ 400mA
5.0
5.0
4.950
4.880
5.050
5.120
V
1mA ≤ IL ≤ 400mA
20
100
ppm/°C
3.3V Version
Output Voltage
5.0V Version
Output Voltage
All Voltage Options
Output Voltage
Temperature Coefficient
(Note1)
Line Regulation (Note 4)
6V ≤ VIN ≤ 20V
1.5
20
mV
Load Regulation (Note 3)
IL=1 to 400mA
5
20
30
mV
Dropout Voltage (Note5)
IL=1mA
60
mV
IL=400mA
370
100
150
400
500
IL=1mA
140
200
300
µA
IL=100mA
1.3
2
2.5
mA
IL=250mA
3.4
9
12
mA
IL=400mA
6
15
25
mA
Ground Current
Current Limit
VOUT=0
Thermal Regulation
0.05
Output Noise, 10Hz to 100kHz
IL=100mA
CL=10µF
CL=100µF
800
mA
0.2
%/W
400
260
µV Vrms
Adjustable 8-Pin Version only
Reference Voltage
1.235
Reference Voltage
Over Temperature
Feedback Pin Bias Current
20
Reference Voltage Temperature
Coefficient
20
Rev:A Date: 03/30/04
1.210
1.260
V
1.185
1.285
V
40
60
nA
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
2
ppm/°C
©Copyright 2004 Sipex Corporation
ELECTRICAL CHARACTERISTICS
Electrical characteristics at VIN = VO+1V, IO = 1mA, COUT = 2.2µF, TA = 25°C, unless otherwise specified. Boldface applies
over the full operating temperature range.
PARAMETER
CONDITIONS
(Note 2)
TYP
Feedback Pin Bias Current
Temperature Coefficient
MIN
MAX
0.1
UNITS
nA/°C
Error Comparator
Output Leakage Current
V0UT=20V
0.01
1
2
µA
Output Low Voltage
VIN=4.5V
IOUT=400µA
150
250
400
mV
Upper Threshold Voltage
(Note 6)
60
Lower Threshold Voltage
(Note 6)
75
Hysteresis
(Note 6)
15
40
25
mV
95
140
mV
mV
Shutdown Input
Input Logic Voltage
1.3
Low (Regulator ON)
High (Regulator OFF)
Shutdown Pin Input Current
Regulator Output Current
in Shutdown
0.7
V
50
100
600
750
µA
2.0
VS=2.4V
30
VS=20V
450
(Note 7)
3
10
20
µA
Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by
the total temperature range.
Note 2: Additional conditions for the 8-pin versions are feedback tied to 5V/3.3V 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 SPX2920 is tested at 150°C for IL = 1 mA. For TJ = 125°C, line regulation is guaranteed
by design.
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: 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 VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5%
guaranteed.
Note 7: VSHUTDOWN ≥ 2V, VIN ≤ 20V, VOUT = 0, Feedback pin tied to 5V/3.3V Tap.
Rev: A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
3
©Copyright 2004 Sipex Corporation
BLOCK DIAGRAM
UNREGULATED DC
7
+
5V @ 400mA
MAX
1
8
2
180k Ω ..
+
_
FROM
TTL
6
ERROR
AMPLIFIER
3
330k Ω ..
60kΩ ..
+
60 mV
+
5
+
_
ERROR DETECTION
COMPARATOR
+ 1.23V
1 uF
TO CMOS OR
TTL
4
REFERENCE
SPX2920-5.0 Block Diagram
APPLICATION HINTS
External Capacitors
The stability of the SPX2920 requires a 2.2µF 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 of 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 500kHz are the most
important parameters in the value of the capacitor. The capacitor value can be increased without limit.
The SPX2920, 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.
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 0.1µF tantalum or aluminum electrolytic capacitor should
be placed from the input to the ground.
Instability can occur if there is stray capacitance to the SPX2920 feedback terminal (pin 7).
This could cause more problems when using a
higher value of external resistors to set the
output voltage.
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 0.5µF and 0.15µF for 1mA.
More output capacitance needed for the 8-pin
version at voltages below 5V since it runs the
error amplifier at lower gain. At worst case
4.7µF or greater must be used for the condition
of 250mA load at 1.23V output.
Rev:A Date: 03/30/04
This problem can be fixed by adding a 100pF
capacitor between output and feedback and
increasing the output capacitor to at least 3.3µF.
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
4
©Copyright 2004 Sipex Corporation
Error Detection Comparator Output
The Comparator produces a logic low output
whenever the SPX2920 output falls out of regulation by more than around 5%. This is around
60mV 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 SPX2920
input is ramped up and down. The ERROR
signal becomes low at around 1.3V input, and
goes high around 5V input (input voltage at
which VOUT = 4.75). Since the SPX2920’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.
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
SPX2920 typically draws 60 µA at no load with
Pin 2 open-circuited this is a small price to pay.
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
400µA; 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.
Noise could also be reduced fourfold by a bypass capacitor across R1, since it reduces the
high frequency gain from 4 to unity. Pick
Reducing Output Noise
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 SPX2920 but
is relatively inefficient, as increasing the capacitor from 1µF to 220µF only decreases the
noise from 430µV to 160µV Vrms for a 100kHz
bandwidth at 5V output.
CBYPASS ≅1 / 2πR1 x 200 Hz
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 100µV Vrms for a 100kHz
bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages.
Programming the Output Voltage of
SPX2920
The SPX2920 may be pin-strapped for 5V or
3.3V using its internal voltage divider by tying
Pin 1 (output) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5V/3.3V Tap).
4.75V
Also, it may be programmed for any output
voltage between its 1.235V reference and its
20V maximum rating. As seen on the front
page, an external pair of resistors is required.
Refer to the below equation for the programming of the output voltage::
OUTPUT
VOLTAGE
_______
ERROR*
VOUT = VREF x ( 1 + R1/ R2 )+ IFBR1
+5.0V
INPUT
VOLTAGE
The VREF is 1.235 and IFB is the feedback bias
current, nominally -20nA. The minimum recommended load current of 1µA forces an upper
limit of 1.2MΩ on value of R2. If no load is
presented the IFB produces an error of typically
Rev: A Date: 03/30/04
+
+1.3V
+
* See Application Info.
Figure 1. ERROR Output Timing
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
5
©Copyright 2004 Sipex Corporation
PACKAGE: 3 PIN TO-220
A
E
E/2
E2
SEATING
PLANE
A
A1
Q
H1
D
D1
CHAMFER
OPTIONAL
L1
1
C
2
3
C
D
D
C
SEE DETAIL B
L
A
2X e
3X b
C
e1
3 PIN TO-220
JEDEC TO-220
(AB) Variation
A2
Dimensions in
(mm)
MIN
A
4.06
-
4.83
b
0.63
-
1.04
C1
0.36
D
14.22
E
9.78
e
1.57
e3
0.76
F
.14
THERMAL
PAD
(E)
NOM MAX
-
(H1)
0.56
D2
14.99
-
(DATUM A)
10.54
-
1.53
-
1.02
E1
-
1.40
H1
5.94
J1
2.29
-
2.92
øP
Q
3.71
2.62
-
3.96
2.87
L
13.72
ø
U
V
-
6.55
- 14.22
7
7.62 REF
3
6.10 REF
c
b
Rev:A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
6
©Copyright 2004 Sipex Corporation
PACKAGE: 3 PIN TO-263
0.405 ± 0.005
(10.287 ± 0.127)
0.176 ± 0.005 (4.470
0.050 ± 0.002 (1.270
0.055 (1.397)
0.356
(9.042
±
±
±
±
0.127)
0.051)
0.005
0.127)
0.600 ± 0.025
(15.24 ± 0.635)
0.100 ± 0.010
(2.540 ± 0.254)
0.103 BSC
(2.616)
Rev: A Date: 03/30/04
0.015
(0.381
0.050 (1.270)
0.032 +- 0.001
(0.813 +- 0.025)
++
-
0.003
0.074)
0° 8°
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
7
©Copyright 2004 Sipex Corporation
PACKAGE: 3 PIN SOT-223
C
D
C
C
N
See detail
A
E
E1
B
A
1
A1
H
e
B
Dimensions in (mm)
GAUGE
PLANE
A
-
-
1.80
A1
0.02
-
0.10
1.60
1.70
A2
1.50
0.76
0.84
b1
0.60
0.71
0.79
b2
2.90
3.00
3.10
b
0.66
b3
2.84
2.95
3.05
c
0.23
0.30
0.35
0.28
0.33
6.50
6.70
c1
0.23
D
6.30
E
6.70
7.00
7.30
E1
3.30
3.50
3.70
e
N
ø
Rev:A Date: 03/30/04
L
0
C
2.30 BASIC
e1
L
SEATING
PLANE
3 PIN SOT-223
JEDEC TO-261
(AA) Variation
MIN NOM MAX
4.60 BASIC
0.75
-
-
-
5
-
0º
-
10º
3 PIN SOT-223
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
8
©Copyright 2004 Sipex Corporation
PACKAGE: 8 PIN NSOIC
D
e
E/2
E1
E
SEE VIEW C
E1/2
1
b
INDEX AREA
(D/2 X E1/2)
Ø1
A
TOP VIEW
Gauge Plane
L2
Seating Plane
Ø1
Ø
L
L1
VIEW C
A2
A
SEATING PLANE
A1
SIDE VIEW
8 Pin NSOIC
(JEDEC MS-012,
AA - VARIATION)
b
WITH PLATING
DIMENSIONS
Minimum/Maximum
(mm)
COMMON HEIGHT DIMENSION
SYMBOL
A
A1
A2
b
c
D
E
E1
e
L
L1
L2
Ø
Ø1
Rev: A Date: 03/30/04
MIN NOM MAX
1.75
1.35
0.25
0.10 1.25
1.65
0.31
0.51
0.17
0.25
4.90 BSC
6.00 BSC
3.90 BSC
1.27 BSC
0.40 1.27
1.04 REF
0.25 BSC
0º
8º
5º
15º
c
BASE METAL
CONTACT AREA
PACKAGE: 8 PIN NSOIC
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
9
©Copyright 2004 Sipex Corporation
ORDERING INFORMATION
Ordering No.
Accuracy
Output Voltage
Packages
SPX2920M3-3.3
1%
3.3V
3-Pin SOT-223
SPX2920M3-5.0
1%
5.0V
3-Pin SOT-223
SPX2920S-3.3
1%
3.3V
8-Pin NSOIC
SPX2920S-5.0
1%
5.0V
8-Pin NSOIC
SPX2920T-3.3
1%
3.3V
3-Pin TO-263
SPX2920T-5.0
1%
5.0V
3-Pin TO-263
SPX2920U-3.3
1%
3.3V
3-Pin TO-220
SPX2920U-5.0
1%
5.0V
3-Pin TO-220
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: [email protected]
Rev:A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
10
©Copyright 2004 Sipex Corporation