Error Flag Signal Output Out-of Regulation (5-Pin Versions)
APPLICATIONS
•
Powering VGA & Sound Card
•
Power PCSupplies
•
SMPS Post-Regulator
•
High Efficiency “Green” Computer Systems
•
High Efficiency Linear Power Supplies
•
Portable Instrumentation
•
Constant Current Regulators
•
Adjustable Power Supplies
•
Battery charger
PRODUCT DESCRIPTION
The SPX2730/31/32/33 is a 3A high accuracy, low dropout voltage regulator (370mV(Typ)@ 3A). The SPX2730/31/32/33 is
designed for low voltage application that requires lower dropout voltage and faster transient response. This device is an excellent
choice for use in powering low voltage microprocessor that require a lower dropout, faster transient response to regulate from +2.5V
to 3.8V supplies and as a post regulator for switching supplies applications.
The SPX2730/31/32/33 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive
and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. Features such as enable pin, Error flag pin are
also included in the 5-pin package.
The SPX2730/31/32/33 are offered in 3 & 5 pin TO-220 & TO-263 packages compatible with other 3 terminal regulators.
PIN CONNECTIONS
TO-220-3 (U)
TO-263-3 (T)
TO-263-5 (T)
SPX2731
1) ENABLE
2) INPUT
3) GND
4) OUTPUT
5) FLAG
TO-220-5 (U)
SPX2730
1
2
3
SPX2731/32/33
SPX2732
1) ENABLE
2) INPUT
3) GND
4) OUTPUT
5) ADJUST
SPX2733
1) FLAG
2) INPUT
3) GND
4) OUTPUT
5) ADJUST
SPX2730
1
2
3
SPX2731/32/33
SPX2731
1) ENABLE
2) INPUT
3) GND
4) OUTPUT
5) FLAG
SPX2732
1) ENABLE
2) INPUT
3) GND
4) OUTPUT
5) ADJUST
SPX2733
1) FLAG
2) INPUT
3) GND
4) OUTPUT
5) ADJUST
1 2 3 4 5
1 2 3 4 5
Top View
Top View
Front View
Front View
Rev. 12/7/00
SPX2730/31/32/33
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 5 Seconds) ................................ 260°C
Storage Temperature Range ...................................................... -65° to +150°C
Maximum Input Voltage ...................................... 16V
Operating Junction Temperature Range
SPX2730/31/32/33 Control Section ................................ -45°C +125°C
SPX2730/31/32/33 Power Transistor............................... -45°C +150°C
ELECTRICAL CHARACTERISTICS
(NOTE 1) at I
OUT
= 10mA, T
a
=25°C, unless otherwise specified.
SPX2730/31/32/33
PARAMETER
CONDITIONS
Typ
Min
Max
3.3V Version
Units
V
Output Voltage (Note 2)
5.0V Version
I
OUT
= 10mA
10mA
≤I
OUT
≤
3A, 4.75V≤V
IN
≤16V
I
OUT
= 10mA
10mA
≤I
OUT
≤
3A, 5.5V≤V
IN
≤16V
3.3
3.3
5.0
5.0
1.240
3.270
3.240
4.95
4.90
1.228
1.215
1.203
3.330
3.360
5.05
5.10
1.252
1.265
1.277
0.5
1
100
175
Output Voltage (Note 2)
All Voltage Options
V
Reference Voltage
Reference Voltage
Line Regulation
Load Regulation
∆V
∆T
Dropout Voltage
(Note 8)`
I
O
= 10mA, (V
OUT
+ 1V)
≤
V
IN
≤
16V
V
IN
= V
OUT
+ 5V, 10mA
≤
I
OUT
≤
I
FULLLOAD
(Note 2, 6)
Output Voltage (Note 6)
Temperature Coef.
V
V
%
%
ppm/°C
mV
0.06
0.2
20
80
250
370
10
37
0.9
4.5
400
260
40
3.0
I
O
= 100mA
I
O
= 1.5A
I
O
= 3A
600
35
mA
mA
A
V
RMS
Ground Current
I
GNDDO
Ground Pin Current at
Dropout
Current Limit
Output Noise Voltage
(10Hz to 100kHz)
I
L
= 100mA
Adjust Pin
Bias Current
Reference Voltage
Temperature
Coefficient
Adjust Pin Bias
Current Temperature
Coefficient
Output Leakage
Current
Output Low
Voltage
I
O
= 1.5A, V
IN
= V
OUT
, +1V
I
O
= 3A
V
IN
= 0.5V less than specified V
OUT
I
OUT
= 10mA
V
OUT
= 0V (Note 4)
C
L
= 10µF
C
L
= 33µF
80
120
nA
ppm/°C
(Note 7)
20
0.1
nA/°C
Flag Output (Error Comparator) SPX2731/SPX2733
V
OH
= 16V
Device set for 5V. V
IN
= 4.5V
I
OL
= 250µA
0.01
220
1.00
2.00
300
400
µA
mV
Rev. 12/7/00
SPX2730/31/32/33
(Cont.)
Upper Threshold
Voltage
Lower Threshold
Voltage
Hysteresis
ENABLE Input SPX2731/SPX2732
Input Logic Voltage
Low (OFF)
High (ON)
Enable Pin
Input Current
Regulator Output
Current in Shutdown
Device set for 5V (Note 9)
Device set for 5V (Note 9)
Device set for 5V (Note 9)
60
75
15
40
25
95
140
mV
mV
mV
0.8
2.4
V
EN
= 16V
V
EN
= 0.8V
(Note 10)
10
500
100
600
750
1
2
V
V
µA
µA
Notes:
The Bold specifications apply to the full operating temperature range.
Note 1: Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle.) The maximum continuous supply voltage is 16V.
Note 2: Full load current (I
FL
) is defined as 1.5A for the
Note 3: Dropout voltage is defined as the input-to output differential when the output voltage drops to 99% of its nominal value with V
OUT
+ 1V applied to V
IN
.
Note 4: V
IN
= V
OUT (NOMINAL)
+1V. For example, use V
IN
= 4.3V for a3.3V regulator. Employ pulse-testing procedures to minimize temperature rise.
Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current.
Note 6: Output voltage temperature coefficient is defined as the worst case voltage changed divided by the total temperature range.
Note 7: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation
effects. Specifications are for a 200mA load pulse as V
IN
= 20V (a 4W pulse) for T = 10ms.
Note 8: V
REF
≤
V
OUT
≤
(V
IN
– 1), 2.3V
≤
V
IN
≤
16V, 10mA < IL
≤
I
FL
, TJ
≤
T
JMAX
Note 9: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured a 6V input. To
express these thresholds in terms of output voltage change, multiply the error amplifier gain = V
OUT
/V
REF
= (R1 + R2)R2. For example, at a programmable output
voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 38mV. Threshold remain constant as a percent of V
OUT
as V
OUT
is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.
Note 10: V
EN
≤
0.8V and V
IN
≤
16V, V
OUT
= 0.
Rev. 12/7/00
SPX2730/31/32/33
APPLICATION HINTS
The SPX2730/31/32/33 incorporates protection against over-
current faults, reversed load insertion, over temperature
operation, and positive and negative transient voltage.
However, the use of an output capacitor is required in order to
insure the stability and the performances.
Thermal Consideration
Although the SPX2730/31/32/33 offers limiting circuitry for
overload conditions, it is necessary not to exceed the
maximum junction temperature, and therefore to be careful
about thermal resistance. The heat flow will follow the lowest
resistance path, which is the Junction-to-case thermal
resistance. In order to insure the best thermal flow of the
component, a proper mounting is required. Note that the case
of the device is electrically connected to the output. The
case has to be electrically isolated, a thermally conductive
spacer can be used. However do not forget to consider its
contribution to thermal resistance.
Assuming:
V
IN
= 10V, V
OUT
= 5V, I
OUT
= 1.5A, T
A
= 50°C/W,
θ
Heatsink Case
= 6°C/W,
θ
Heatsink Case
= 0.5°C/W,
θ
JC
= 3°C/W
Power dissipation under this condition
P
D
= (V
IN
– V
OUT
) * I
OUT
= 7.5W
Junction Temperature
T
J
= T
A
+ P
D
* (θ
Case – HS
+
θ
HS
θ
JC
)
For the Control Section
T
J
= 50 + 7.5*(0.5 + 6=3) = 121.25°C
121.25°C < T
J (max)
for the Control & Power Sections.
In both case reliable operation is insured by adequate junction
temperature.
Capacitor Requirements
The output capacitor is needed for stability and to minimize
the output noise. The required value of the capacitor varies
with the load. However, a minimum value of 10µF Aluminum
will guarantee stability over load. A tantalum capacitor is
recommended for a fast load transient response
If the power source has high AC impedance, a 0.1µF capacitor
between input & ground is recommended. This capacitor
should have good characteristics up to 250 kHz.
Minimum Load Current
To ensure a proper behavior of the regulator at light load, a
minimum load of 10mA for SPX2730/31/32/33 is required.
V
IN
Adjustable Regulator Design
SPX2732/33are adjustable regulators and maybe programmed
for any value between 1.25V and 16V using two resistors.
The relation between the resistors is given by:
R
1
=R
2
(V
OUT
/1.240 –1)
Resistors have a large value up to 1mΩ in order to reduce the
current consumption. This might be interesting in the case of
widely varying load currents.
Error Flag
SPX2731/33 features an error indicating either an over current
fault or a low input voltage. This flag pulls low when such a
problem occurs and may sink 10mA. It is inoperative during
thermal shutdown.
Enable Input
SPX2731/32 features enable input allowing turning ON &
OFF the device. EN has been designed to be compatible with
TTL/CMOS logic. When the regulator is ON, the current
flowing through this pin is approximately 20µA.
V
IN
V
OUT
SPX2730
Fig.1 Basic Fixed Output Regulator
4
1
2 SPX2732/33
5
3
V
OUT
R
1
V
OUT
= V
REF
X [ 1 + (R
1
/R
2
) ]
For best results, the total series resistance should be
small enough to pass the minimum regulator load current
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