ETC2 CM1582DCN263 3a low dropout voltage regulator Datasheet

CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
FEATURES
The CM1582 is a high performance low dropout regulator
!
rated for 3A output current with fixed 1.8V/2.5V/3.3V/5.0V and
Input-Output differential of typical 500mV at 3A and low
quiescent current
adjustable output. It is designed for use in applications
!
Output Current is excess of 3A
requiring low dropout characteristics over the rated current
!
Remote sense pin available
range.
!
Reverse battery protection
!
Short Circuit Protection
When the second low-current input voltage is applied, the
!
Internal Thermal Overload Protection
dropout voltage can be as low as 100mV at light loads and up
!
5L TO-220 and 5L TO-263 package available
to 500mV at maximum output current. On chip trimming
adjusts the reference voltage to 1%. These features are ideal
for low voltage microprocessor applications requiring a
regulated 1.8V to 3.6V power supply.
In addition, the CM1582 provides the device protections
including over current and thermal shutdown. The CM1582
series are ideal to the next generation microprocessor on
motherboards where both 5V and 3.3V are available.
APPLICATIONS
!
Power Supplies
!
Computer Add-On Cards
!
Other Applications Requiring Low Dropout Voltage Over
Rated Current
PIN CONFIGURATION
TO-263
Top View
V CONTROL
V POWER
GND/ADJ
1 2
V OUT
SENSE
TO-220
Top View
3
4
5
2002/02/05 Preliminary Rev. 1
V PO W ER
5
V CONTROL
4
V OUT
3
G N D /A D J
2
SENSE
1
Champion Microelectronic Corporation
Page 1
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
ORDERING INFORMATION
Package Type
Operating Temperature
Output Voltage
TO-220
TO-263
Range (TA)
CM1582DCN220
CM1582DCN263
0℃ ~ +70℃
1.8V
CM1582KCN220
CM1582KCN263
0℃ ~ +70℃
2.5V
CM1582SCN220
CM1582SCN263
0℃ ~ +70℃
3.3V
CM1582ZJCN220
CM1582ZJCN263
0℃ ~ +70℃
5.0V
CM1582CN220
CM1582CN263
0℃ ~ +70℃
ADJ.
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VPOWER) …….………………………………………….……. +13V
Input Voltage (VCONTROL ) …….……………………………………….……. +13V
Operating Junction Temperature Range, TJ
……………...… 0℃ to +150℃
Storage Temperature ………………………………….….…... -65℃ to +150℃
Lead Temperature (10 sec.) ……..……………………..….…………….... 300℃
POWER DISSIPATION TABLE
Package
ΘJA (℃/W)
TO-220
TO-263
45
45
Derating factor (mW/℃)
TA >= 25℃
22.2
22.2
TA <= 25℃
Power rating (mW)
2775
2775
TA = 70℃
TA = 85℃
Power rating (mW) Power rating (mW)
1776
1443
1776
1443
Note:
1. ΘJA : Thermal Resistance-Junction to Ambient, DF: Derating factor, PO: Power consumption.
2.
Junction Temperature Calculation: TJ = TA + (PD x ΘJA ), PO = DF x (TJ – TA)
The ΘJA numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
ΘJT : Thermal Resistance-Junction to Ambient, TC: case (Tab) temperature, TJ = TC + (PD x ΘJC )
RECOMMENDED OPERATING CONDITIONS
Parameter
Input Voltage (VIN)
Load Current (with adequate heatsinking)
Input Capacitor (VIN to GND)
Output Capacitor with ESR of 10Ω max. (VOUT to GND)
2002/02/05 Preliminary Rev. 1
Symbol
VPOWER
VCONTROL
IO
Min.
2
2.75
10
10
33
Champion Microelectronic Corporation
Typ.
Max
7
12
Units
V
V
mA
µF
µF
Page 2
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
BLOCK DIAGRAM
CM1582 Fixed Output Voltage Block Diagram
CM1582 Adjustable Output Voltage block Diagram
2002/02/05 Preliminary Rev. 1
Champion Microelectronic Corporation
Page 3
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IOUT = 0mA, and TJ = +25℃; unless otherwise noted
Parameter
Output Voltage
Output Voltage
Device
Test Conditions
CM1582D
CM1582
Typ.
Max.
VCONTROL = 3.3V, VPOWER = 2.5V
1.792
1.800
1.818
V
CM1582K
VCONTROL = 5.0V, VPOWER = 3.3V
2.474
2.500
2.525
V
CM1582S
VCONTROL = 5.0V, VPOWER = 4.1V
3.267
3.300
3.333
V
CM1582ZJ
VCONTROL = 7.0V, VPOWER = 5.8V
4.950
5.000
5.050
V
CM1582D
VCONTROL = 3.3V, VPOWER = 2.5V
1.771
1.800
1.829
V
CM1582K
VCONTROL = 5.0V, VPOWER = 3.3V
2.460
2.500
2.540
V
CM1582S
VCONTROL = 5.0V, VPOWER = 4.1V
CM1582ZJ
VCONTROL = 7.0V, VPOWER = 5.8V
IOUT = 3A
3.247
3.300
3.353
V
4.920
5.000
5.080
V
1.238
1.250
1.262
V
1.230
1.250
1.270
V
0.04
0.20
%
0.08
0.3
%
IOUT = 10mA
1.00
1.15
IOUT = 3A
1.15
1.30
IOUT = 10mA
0.10
0.17
IOUT = 3A
0.45
0.50
50
120
µA
80
135
mA
10
mA
VCONTROL = 5.0V, VPOWER = 3.3V (note1)
Reference Voltage
Unit
Min.
CM1582(adj)
VCONTROL = (VOUT + 1.5V) to 12V, VPOWER = (VOUT +
0.8V) to 7V, IOUT = 10mA to 3A
1.5V+ VOUT <= VCONTROL <= 12V,
Line Regulator (note 2)
0.8V<= VPOWER - VOUT <= 5.5V
VCONTROL = VOUT + 2.5V, VPOWER = VOUT + 0.8V,
Load Regulation (note 2)
Dropout Voltage (Note 3)
VCONTROL - VOUT
Dropout Voltage (Note 3)
VPOWER - VOUT
IOUT = 10mA to 3A
VPOWER = VOUT + 0.8V
VCONTROL = VOUT + 2.5V
Adjust Pin Current
Control Pin Current
VCONTROL = 2.75V, VPOWER = 2.05V,
IOUT = 10mA
VCONTROL = VOUT + 2.5V, VPOWER = VOUT + 0.8V,
IOUT = 10mA to 3A
Current Limit
(VIN – VOUT ) = 1.5V
Minimum Load Current (Note 4)
VCONTROL = 5.0V, VPOWER = 3.3V
Ripple Rejection (Note 5)
Thermal Regulation
VCONTROL = VPOWER = VOUT + 2.5V,
VRIPPLE = 1VPP, IOUT = 2.3A
TA = 25℃
3
V
4
5
60
V
A
80
dB
0.003
%/W
Note 1: Output voltage is set to be 2.5V.
Note 2: Line and load regulations are guaranteed up to maximum power dissipation determined by input/output differential and
the output current. However, the maximum power will not be available over the full input/output voltage range.
Note 3: The specifications represent the minimum input/output voltage required to maintain 1% regulation.
Note 4: The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor
divider used to set the output voltage is selected to meet the minimum load current requirement.
Note 5: These parameters, although guaranteed, are not tested in production prior to shipment.
2002/02/05 Preliminary Rev. 1
Champion Microelectronic Corporation
Page 4
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
APPLICATION CIRCUIT
CM1582 Fixed Output Voltage Application Circuit
CM1582 Adjustable Output Voltage Application Circuit
2002/02/05 Preliminary Rev. 1
Champion Microelectronic Corporation
Page 5
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
APPLICATION INFORMATION
General
The CM1582 series is designed to power the new generation of microprocessors. It is designed to make use of multiple power
supplies, present in most systems, to reduce the dropout voltage. One of the advantages of the two-supply approach is
maximizing the efficiency.
The second supply is at least 1V greater than output voltage and is providing the power for the control circuitry and supplies the
drive current to the NPN output transistor. This allows the NPN output transistor to be driven into saturation. For the control
voltage the current requirement is small, about 1% of the output current or approximately 50mA for a 3A load. This drive current
becomes part of the output current. The maximum voltage on the Control pin is 13V. The maximum voltage at the Power pin is 7V.
By trying the control and power inputs together the CM1582 can be operated as a single supply device. In single supply operation,
the dropout voltage will be determined by the minimum the Control voltage.
The new generation of microprocessors cycle load current from several hundred milliampers to several amperes in tens of
nanoseconds. Output voltage tolerances are tighter and include transient response as part of the specification. Designed to meet
the fast current load step requirements of these microprocessors, the CM1582 also saves total cost by needing less output
capacitance to maintain regulation.
The sense pin permits very accurate regulation of output voltage. As a result, over an output current range of 100mA to 3A, the
typical load regulation is less than 1mV.
In addition to the enhancements mentioned, the reference accuracy has been improved a factor of two with a guaranteed initial
tolerance of ±1% at 25℃ and 1.6% accuracy over the full temperature and load current load.
Typical applications for the CM1582 include 3.3V to 2.5V conversion with a 5V control supply, 5V to 4.2V conversion with a 12V
control supply or 5V to 3.6V conversion with a 12V control supply. It is easy to obtain dropout voltages of less than 0.5V at 2.3A
along with excellent static and dynamic specifications. The device is fully protected against over current and over temperature
conditions.
Grounding and Output Sensing
The CM1582 adjustable voltage version allows true Kelvin sensing for both the high and low side of the load. As a result the
voltage regulation at the load can be easily optimized. Voltage drops due to parasitic resistances between the regulator and the
load can be placed inside the regulation loop. The advantages of remote sensing are illustrated in figures 1 through 3.
Figure 1 shows the device connected as a conventional 3 terminal regulator with the Sense lead connected directly to the output
of the device. Rp is the parasitic resistance of the connections between the device and the load. Trace A of figure 3 illustrates the
effect of Rp.
Figure 2 shows the device connected to take advantage of the remote sense feature. The Sense pin and the top of the resistor
divider are connected to the top of the load; the bottom of the resistor divider is connected to the bottom of the load. The effect on
the output regulation can be seen in trace B of figure 3.
It is important to note that the voltage drops due to Rp are not eliminated; they will add to the dropout voltage of the regulator
regardless. The CM1582 adjustable can control the voltage at the load as long as the input-output voltage is greater than the total
of the dropout voltage of the device plus the voltage drop across Rp.
2002/02/05 Preliminary Rev. 1
Champion Microelectronic Corporation
Page 6
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
Stability
The circuit design used in the CM1582 series requires the use of an output capacitor as part of the device frequency
compensation. The addition of 150uF Aluminum electrolytic or a 22uF solid tantalum on the output will ensure stability for all
operating conditions. In order to meet the transient performance of the processor larger value capacitors are needed. To limit the
high frequency noise generated by the processor, high quality bypass capacitors must be used. In order to limit parasitic
inductance (ESL) and resistance (ESR) in capacitors to acceptable limits, multiple small ceramic capacitor in addition to high
quality solid tantalum capacitors are required.
When the adjustment terminal is bypassed to improve the ripple rejection, the requirement for an output capacitor increases. To
further improve stability and transient response of these devices larger values of output capacitor can be used. The modern
processors generate large high frequency current transients.
The load current step contains higher order frequency components than the output-coupling network must handle until the
regulator throttles to the load current level. Because they contain parasitic resistance and inductance, capacitors are not ideal
elements. These parasitic elements dominate the change in output voltage at the beginning of a transient load step change. The
ESR of the output capacitors produces and instantaneous step in output voltage at the beginning of a transient load step change.
The ESR of the output capacitors produces an instantaneous step in out voltage ∆V = ∆I(ESR). The ESL of the output capacitors
produces a droop proportional to the rate of change of the output current ∆V = L(∆I/∆t). The output capacitance produces a
change in output voltage proportional to the time until the regulator an respond ∆V = ∆t(∆I/C). Figure 4 illustrates these transient
effects.
2002/02/05 Preliminary Rev. 1
Champion Microelectronic Corporation
Page 7
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
Output Voltage
The CM1582 adjustable version develops a 1.25V reference voltage between the Sense pin and the Adjust pin (Figure 5). Placing
a resistor between these two terminals causes a constant current to flow through R1 and down through R2 to set the output
voltage. In general R1 is chosen so that this current is the specified minimum load current of 10mA. The current out of the Adjust
pin is small, typically 50uA and it adds to the current for R1. For best regulation the top of the resistor divider should be connected
directly to the Sense pin.
2002/02/05 Preliminary Rev. 1
Champion Microelectronic Corporation
Page 8
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
Protection Diodes
In normal operation, CM1582 family does not need any protection diodes between the adjustment pin and the output and from the
output to the input to prevent die overstress. Internal resistors are limiting the internal current paths on the ADJ pin. Therefore
even with bypass capacitors on the adjust pin no protection diode is needed to ensure device safety under short-circuit conditions.
The Adjust pin can be driver on a transient basis ±7V with respect ti the output without any device degradation.
A protection diode between the Output pin and VPOWER pin is not usually needed. Microsecond surge currents of 50A to 100A can
be handled by the internal diode between the Output pin and VPOWER pin of the device. In normal operations, it is difficult to get
those values of surge currents even with the use of large output capacitances. Only with high value output capacitors, such as
1000uF to 5000uF and the VPOWER pin is instantaneously shorted to ground, damage an occur. A diode from output to input is
recommended (Figure 6). If CM1582 is connected as single supply device with the control and power input pins shorted together
the internal diode between the output and power input pin will protect the control input pin.
Thermal Consideration
The CM1582 adjustable version had internal power and thermal limiting circuitry (about 150℃) designed to protect the device
under overload conditions. However, maximum junction temperature ratings should not be exceeded under continuous normal
load conditions. Careful consideration must be given to all sources of thermal resistance from junction to ambient, including
junction-to-case, case-to-heatsink interface and heatsink resistance itself.
Junction temperature of the Control section can run up to 125℃. Junction temperature rise in the power transistor will be greater
than the temperature rise in the Control section making the thermal resistance lower in the Control section. At power levels below
12W, the temperature gradient will be lese than 25℃ and the maximum ambient temperature will be determined by the junction
temperature of the Control section. This is due to the lower maximum junction temperature in the Control section. At power levels
above 12W, the temperature gradient will be greater than 25℃ and the maximum ambient temperature will be determined by the
Power section. In both cases, the junction temperature is determined by the total power dissipated in the device. For most low
dropout applications the power dissipation will be less than 12W.
The power in the device us made up of two components: the power in the output transistor and the power in the control circuit.
The power in the control circuit is negligible, which is equal to: PCONTROL = (VCONTROL – VOUT)/ICONTROL, where ICONTROL is equal to
IOUT/100(typ)
The power in the output transistor is equal to: POUTPUT = (VPOWER – VOUT)/IOUT
The total power is equal to: PCONTROL + POUTPUT
Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. This is the
lowest resistance path for the heat flow. In order to ensure the best possible thermal flow this area of the package to the heatsink
proper mounting is required. Thermal compound at the case-to-heatsink interface is recommended. A thermally conductive
spacer can be used, if the case of the device must be electrically isolated, but its added contribution to thermal resistance has to
be considered.
2002/02/05 Preliminary Rev. 1
Champion Microelectronic Corporation
Page 9
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
PACKAGE DIMENSION
TO-220 (N220)
C
B
S
T
F
A
B
C
A
D
F
G
J
K
1 2 3 4 5
N
R
S
K
T
G
N
R
J
D
TO-263 (N263)
C
D
L
K
B
I
A
G
F
2002/02/05 Preliminary Rev. 1
E
Champion Microelectronic Corporation
Page 10
CM1582
3A LOW DROPOUT VOLTAGE REGULATOR
IMPORTANT NOTICE
Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated
circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify,
before placing orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or
environmental damage.
CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for
use in life-support applications, devices or systems or other critical applications.
understood to be fully at the risk of the customer.
Use of CMC products in such applications is
In order to minimize risks associated with the customer’s applications, the
customer should provide adequate design and operating safeguards.
HsinChu Headquarter
Sales & Marketing
5F, No. 11, Park Avenue II,
Science-Based Industrial Park,
HsinChu City, Taiwan
T E L : +886-3-567 9979
F A X : +886-3-567 9909
11F, No. 306-3, SEC. 1, Ta Tung Road,
Hsichih, Taipei Hsien 221, Taiwan
2002/02/05 Preliminary Rev. 1
T E L : +886-2-8692 1591
F A X : +886-2-8692 1596
Champion Microelectronic Corporation
Page 11
Similar pages