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(R)
SPX2920
400mA Low Drop Out Voltage Regulator with Shutdown
FEATURES
Output 3.3V, 5.0V, at 400mA Output Very Low Quiescent Current Low Dropout Voltage Extremely Tight Load And Line Regulation Very Low Temperature Coefficient Current & Thermal Limiting Error Flag Warns Of Output Dropout (for SO-8) Logic-Controlled Electronic Shutdown (for SO-8) Output Programmable From 1.24V to 20V (for SO-8)
0.1 F
ON SHUTDOWN INPUT OFF +VIN 100K 8 +VIN VOUT + 7 R1 0.01F 10F 1 1.2V to 20V
SPX2920
3 SD GND 4
FB
______ ERROR
ERROR 5 R2 VREF OUTPUT
Adjustable Regulator
5V IN OUT
VIN
SPX2920
+ GND + 2.2 F
Equivalent Replacement for MIC2920A and MIC2904
5V Regulator Circuit
IG
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 (140A 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) TO-263-3 (T)
VOUT
8-Pin Surface Mount
SOT-223 (M3)
1 2 3 4
8 7
VIN FEEDBACK 5V/ 3.3V TAP ERROR VIN GND VOUT
SPX2920 SPX2920
1 2 3 1 2 3
SENSE SHUTDOWN GND
SPX2920
1 2 3
SPX2920
6 5
VIN GND
VOUT
VIN GND VOUT
Front View
Top View
Top View
Top View
Rev: A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
(c)Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation ........................................................ Internally Limited Lead Temp. (Soldering, 5 Seconds) ............................................. 260C Storage Temperature Range ........................................ -65C to +150C Operating Junction Temperature Range ....................... -40C to +125C Input Supply Voltage ......................................................... -20V to +20V Feedback Input Voltage .................................................... -1.5V to +20V Shutdown Input Voltage .................................................... -0.3V to +20V Error Comparator Output .................................................. -0.3V to +20V ESD Rating ....................................................................................... 2kV
ELECTRICAL CHARACTERISTICS
Electrical characteristics at VIN =VO +1V, IO = 1mA, COUT = 2.2F, TA = 25C, unless otherwise specified. Boldface applies over the full operating temperature range. PARAMETER 3.3V Version Output Voltage 1mA IL 400mA 5.0V Version Output Voltage 1mA IL 400mA All Voltage Options Output Voltage Temperature Coefficient Line Regulation (Note 4) Load Regulation (Note 3) Dropout Voltage (Note5) 20 (Note1) 6V VIN 20V IL=1 to 400mA IL=1mA IL=400mA Ground Current IL=1mA IL=100mA IL=250mA IL=400mA Current Limit Thermal Regulation Output Noise, 10Hz to 100kHz IL=100mA Adjustable 8-Pin Version only Reference Voltage Reference Voltage Feedback Pin Bias Current Reference Voltage Temperature Coefficient Over Temperature 20 20 1.235 1.210 1.185 1.260 1.285 40 60 V V nA ppm/C CL=10F CL=100F VOUT=0 0.05 400 260 1.5 5 60 370 140 1.3 3.4 6 20 20 30 100 150 400 500 200 300 2 2.5 9 12 15 25 800 0.2 mV mV mV 100 ppm/C 5.0 5.0 4.950 4.880 5.050 5.120 V 3.3 3.3 3.267 3.217 3.333 3.382 V CONDITIONS (Note 2) TYP MIN MAX UNITS
A mA mA mA mA %/W V Vrms
Rev:A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
(c)Copyright 2004 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
Electrical characteristics at VIN = VO+1V, IO = 1mA, COUT = 2.2F, TA = 25C, unless otherwise specified. Boldface applies over the full operating temperature range. PARAMETER Feedback Pin Bias Current Temperature Coefficient Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input Input Logic Voltage Low (Regulator ON) High (Regulator OFF) Shutdown Pin Input Current VS=2.4V VS=20V Regulator Output Current in Shutdown (Note 7) 30 450 3 10 20 1.3 0.7 2.0 50 100 600 750 A V V0UT=20V VIN=4.5V IOUT=400A (Note 6) (Note 6) (Note 6) 0.01 150 60 75 15 40 25 95 140 1 2 250 400 A mV mV mV mV CONDITIONS (Note 2) TYP 0.1 MIN MAX UNITS nA/C
A
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 150C for IL = 1 mA. For TJ = 125C, 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
(c)Copyright 2004 Sipex Corporation
3
BLOCK DIAGRAM
UNREGULATED DC 5V @ 400mA MAX
+
7
8
1
2
+ _ FROM TTL
180k .. ERROR AMPLIFIER
6
330k .. 60k .. +
3
+
60 mV + 1.23V
5
+ _ ERROR DETECTION COMPARATOR
1 uF TO CMOS OR TTL
4
REFERENCE
SPX2920-5.0 Block Diagram
APPLICATION HINTS External Capacitors The stability of the SPX2920 requires a 2.2F 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 -25C solid tantalum is recommended since the many aluminum types have electrolytes that freeze at about -30C. The ESR of about 5 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. 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 0.5F and 0.15F 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 4.7F or greater must be used for the condition of 250mA load at 1.23V output. 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 0.1F 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. This problem can be fixed by adding a 100pF capacitor between output and feedback and increasing the output capacitor to at least 3.3F.
Rev:A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
(c)Copyright 2004 Sipex Corporation
4
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. 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 400A; this value adds to battery drain in a low battery condition. Suggested values range from 100K to 1M. If the output is unused this resistor is not required. 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). 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:: VOUT = VREF x ( 1 + R1/ R2 )+ IFBR1 The VREF is 1.235 and IFB is the feedback bias current, nominally -20nA. The minimum recommended load current of 1A forces an upper limit of 1.2M 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 12A. Since the SPX2920 typically draws 60 A at no load with Pin 2 open-circuited this is a small price to pay. 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 1F to 220F only decreases the noise from 430V to 160V Vrms for a 100kHz 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 CBYPASS 1 / 2R1 x 200 Hz or choose 0.01F. When doing this, the output capacitor must be increased to 3.3F to maintain stability. These changes reduce the output noise from 430V to 100V 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.
4.75V OUTPUT VOLTAGE _______ ERROR*
+5.0V
INPUT VOLTAGE
+ +
+1.3V
* See Application Info.
Figure 1. ERROR Output Timing
Rev: A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
(c)Copyright 2004 Sipex Corporation
5
PACKAGE: 3 PIN TO-220
A E
E2 E/2
A A1
SEATING PLANE
Q
H1
D CHAMFER OPTIONAL
D1 1 C C 2 D 3 D
L1
C
SEE DETAIL B
L
A 2X e e1 3X b C A2
3 PIN TO-220 JEDEC TO-220 (AB) Variation A b C1 D E e e3 F H1
Dimensions in (mm)
MIN NOM MAX
(E)
THERMAL PAD
4.06 0.63 0.36 14.22 9.78 1.57 0.76 .14 5.94 2.29 3.71 2.62 13.72
-
4.83 1.04 0.56 14.99
(H1)
D2 (DATUM A)
-
10.54 1.53 1.02
E1
1.40 6.55 2.92 3.96 2.87
J1
oP Q L
o
U V
3
- 14.22 7 7.62 REF 6.10 REF
c
b
Rev:A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
(c)Copyright 2004 Sipex Corporation
6
PACKAGE: 3 PIN TO-263
0.405 0.005 (10.287 0.127)
0.055 (1.397)
0.176 0.005 (4.470 0.050 0.002 (1.270

0.127) 0.051)
0.356 (9.042

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)
0.050 (1.270) 0.032 + 0.001 (0.813 + 0.025) -
0.015 (0.381
+ + -
0.003 0.074) 0 8
Rev: A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
(c)Copyright 2004 Sipex Corporation
7
PACKAGE: 3 PIN SOT-223
C
D C N C See detail A
E1
E
B
1 e B
A A1 H GAUGE PLANE SEATING PLANE L 0 C
Dimensions in (mm)
3 PIN SOT-223 JEDEC TO-261 (AA) Variation MIN NOM MAX 0.02 1.50 0.66 0.60 2.90 2.84 0.23 0.23 6.30 6.70 3.30 1.60 0.76 0.71 3.00 2.95 0.30 0.28 6.50 7.00 3.50 1.80 0.10 1.70 0.84 0.79 3.10 3.05 0.35 0.33 6.70 7.30 3.70
A A1 A2 b b1 b2 b3 c c1 D E E1 e e1 L N o
2.30 BASIC 4.60 BASIC 0.75 0 5 10
3 PIN SOT-223
Rev:A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
(c)Copyright 2004 Sipex Corporation
8
PACKAGE: 8 PIN NSOIC
D e
E/2 E1 E E1/2
SEE VIEW C
1 INDEX AREA (D/2 X E1/2) A b
O1
TOP VIEW
Gauge Plane L2 Seating Plane
O1
L L1
O
VIEW C
A A2 SEATING PLANE A1
SIDE VIEW
8 Pin NSOIC
(JEDEC MS-012, AA - VARIATION)
DIMENSIONS Minimum/Maximum (mm)
WITH PLATING
b
COMMON HEIGHT DIMENSION
SYMBOL A A1 A2 b c D E E1 e L L1 L2 O O1
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 0 8 5 15
c
BASE METAL
CONTACT AREA
PACKAGE: 8 PIN NSOIC
Rev: A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
(c)Copyright 2004 Sipex Corporation
9
ORDERING INFORMATION
Ordering No.
SPX2920M3-3.3 SPX2920M3-5.0 SPX2920S-3.3 SPX2920S-5.0 SPX2920T-3.3 SPX2920T-5.0 SPX2920U-3.3 SPX2920U-5.0
Accuracy
1% 1% 1% 1% 1% 1% 1% 1%
Output Voltage
3.3V 5.0V 3.3V 5.0V 3.3V 5.0V 3.3V 5.0V
Packages
3-Pin SOT-223 3-Pin SOT-223 8-Pin NSOIC 8-Pin NSOIC 3-Pin TO-263 3-Pin TO-263 3-Pin TO-220 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: sales@sipex.com
Rev:A Date: 03/30/04
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
(c)Copyright 2004 Sipex Corporation
10

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