CS52015-3GDP3 [CHERRY]
1.5A, 3.3V Fixed Linear Regulator; 1.5A ， 3.3V固定线性稳压器
| 型号： | CS52015-3GDP3 |
| 厂家： | 
CHERRY SEMICONDUCTOR CORPORATION |
| 描述： | 1.5A, 3.3V Fixed Linear Regulator |
| 文件： | 总6页 (文件大小：163K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CS52015-3
1.5A, 3.3V Fixed Linear Regulator
Description
Features
The CS52015-3 linear regulator pro-
vides 1.5A at 3.3V with an output
voltage accuracy of ±1.5%.
1.4V at 1.5A output current. The
maximum quiescent current is only
10mA at full load. Device protec-
tion includes overcurrent and ther-
mal shutdown.
■ Output Current to 1.5A
■ Output Accuracy to ±1.5%
Over Temperature
The regulator is intended for use as
a post regulator and microprocessor
supply. The fast loop response and
low dropout voltage make this reg-
ulator ideal for applications where
low voltage operation and good
transient response are important.
■ Dropout Voltage (typical)
The CS52015-3 is pin compatible
with the LT1086 family of linear
regulators but has lower dropout
voltage.
1.05V @ 1.5A
■ Fast Transient Response
■ Fault Protection
Current Limit
The regulator is available in TO-
220, surface mount D2, and SOT-223
packages.
The circuit is designed to operate
with dropout voltages less than
Thermal Shutdown
Application Diagram
Package Options
3L D2PAK
3L TO-220
Tab (VOUT
)
Tab (VOUT
)
VOUT
CS52015-3
3.3V
@ 1.5A
VIN
Gnd
1
22mF
5V
10 mF
5V
3L SOT-223
1
Tab (VOUT
)
CS52015 -3
1
2
3
Gnd
VOUT (tab)
VIN
1
Consult factory for other fixed output voltage
options.
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Rev. 2/17/98
1
A
¨
Company
Absolute Maximum Ratings
Supply Voltage, VIN.....................................................................................................................................................................7V
Operating Temperature Range................................................................................................................................-40¡C to 70¡C
Junction Temperature ............................................................................................................................................................150¡C
Storage Temperature Range ..................................................................................................................................-60¡C to 150¡C
Lead Temperature Soldering
Wave Solder (through hole styles only) .....................................................................................10 sec. max, 260¡C peak
Reflow (SMD styles only) ......................................................................................60 sec. max above 183¡C, 230¡C peak
ESD Damage Threshold............................................................................................................................................................2kV
Electrical Characteristics: CIN = 10µF, COUT = 22µF Tantalum, VOUT + VDROPOUT < VIN < 7V, 0¡C ² TA ² 70¡C, TJ ² +150¡C,
unless otherwise specified, Ifull load = 1.5A.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
■ Fixed Output Voltage
Output Voltage
(Notes 1 and 2)
V
INÐVOUT=1.5V
3.250
(-1.5%)
3.300
3.350
(+1.5%)
V
0²IOUT²1.5A
Line Regulation
2V²VINÐVOUT²3.7V; IOUT=10mA
VINÐVOUT=2V; 10mA ²IOUT²1.5A
0.02
0.04
0.20
0.4
%
%
Load Regulation
(Notes 1 and 2)
Dropout Voltage (Note 3)
Current Limit
IOUT=1.5A
1.05
3.1
1.4
V
VINÐVOUT=3V
IOUT=10mA
1.6
A
Quiescent Current
5.0
10.0
mA
%/W
dB
Thermal Regulation (Note 4)
30ms pulse; TA=25¡C
0.002
80
0.020
Ripple Rejection
(Note 4)
f=120Hz; IOUT=1.5A; VINÐVOUT=3V;
VRIPPLE=1VP-P
Thermal Shutdown (Note 5)
150
180
25
210
¡C
¡C
Thermal Shutdown Hysteresis
(Note 5)
Note 1: Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing. Changes in out-
put voltage due to temperature changes must be taken into account separately.
Note 2: Specifications apply for an external Kelvin sense connection at a point on the output pin 1/4Ó from the bottom of the package.
Note 3: Dropout voltage is a measurement of the minimum input/output differential at full load.
Note 4: Guaranteed by design, not tested in production.
Note 5: Thermal shutdown is 100% functionally tested in production.
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
D2PAK
TO-220
SOT-223
1
2
3
1
2
3
1
2
3
Gnd
VOUT
VIN
Ground connection
Regulated output voltage (case).
Input voltage
2
Block Diagram
VOUT
VIN
Output
Current
Limit
Thermal
Shutdown
Error
Amplifier
-
+
Bandgap
Gnd
Typical Performance Characteristics
1.05
1.00
0.10
0.08
0.06
0.04
T
0ûC
CASE
0.95
0.90
0.85
0.80
0.75
0.02
0.00
T
25ûC
CASE
-0.02
-0.04
-0.06
-0.08
-0.10
-0.12
T
125ûC
CASE
0
10 20 30 40 50 60 70 80 90 100 110 120 130
TJ (°C)
0
300
600
900
1200
1500
I
(mA)
OUT
Dropout Voltage vs Output Current
Output Voltage vs. Temperature
3.5
3.3
3.1
2.9
85
75
65
2.7
2.5
2.3
2.1
1.9
1.7
55
T
= 25°C
= 1.5A
CASE
45
35
25
15
I
OUT
(V Ð V
V
) = 3V
OUT
IN
= 1.0V
PP
RIPPLE
1.5
5
1
2
3
4
6
10
10
10
10
10
10
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
Frequency (Hz)
VIN - VOUT (V)
Ripple Rejection vs. Frequency
Short Circuit Current vs VIN-VOUT
3
Typical Performance Characteristics
0.100
200
0.075
100
0
C
=C =22mF Tantalum
IN
-100
-200
0.050
0.025
OUT
T
= 125°C
CASE
T
= 25°C
CASE
1500
750
0
T
= 0°C
CASE
0.000
0
1
2
0
1
2
3
4
5
6
7
8
9
10
Output Current (A)
Time mS
Transient Response
Load Regulation vs. Output Current
Applications Information
The CS52015-3 linear regulator provides a 3.3V output
voltage at currents up to 1.5A. The regulator is protected
against overcurrent conditions and includes thermal
shutdown.
Protection Diodes
When large external capacitors are used with a linear regu-
lator it is sometimes necessary to add protection diodes. If
the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator.
The discharge current depends on the value of the capaci-
tor, the output voltage and the rate at which VIN drops. In
the CS52015-3 linear regulator, the discharge path is
through a large junction and protection diodes are not usu-
ally needed. If the regulator is used with large values of
output capacitance and the input voltage is instantaneous-
ly shorted to ground, damage can occur. In this case, a
diode connected as shown in Figure 1 is recommended.
The CS52015-3 has a composite PNP-NPN output transistor
and requires an output capacitor for stability. A detailed
procedure for selecting this capacitor is included in the
Stability Considerations section.
Stability Considerations
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start-up
delay, load transient response and loop stability.
The capacitor value and type are based on cost, availabili-
ty, size and temperature constraints. A tantalum or alu-
minum electrolytic capacitor is best, since a film or ceramic
capacitor with almost zero ESR can cause instability. The
aluminum electrolytic capacitor is the least expensive solu-
tion. However, when the circuit operates at low tempera-
tures, both the value and ESR of the capacitor will vary
considerably. The capacitor manufacturersÕ data sheet pro-
vides this information.
IN4002
(optional)
VOUT
VIN
VOUT
VIN
C1
CS52015-3
C2
Gnd
A 22µF tantalum capacitor will work for most applications,
but with high current regulators such as the CS52015-3 the
transient response and stability improve with higher val-
ues of capacitance. The majority of applications for this
regulator involve large changes in load current so the out-
put capacitor must supply the instantaneous load current.
The ESR of the output capacitor causes an immediate drop
in output voltage given by:
Figure 1: Protection diode scheme for large output capacitors.
Output Voltage Sensing
ÆV = ÆI ´ ESR
For microprocessor applications it is customary to use an
output capacitor network consisting of several tantalum and
ceramic capacitors in parallel. This reduces the overall ESR
and reduces the instantaneous output voltage drop under
load transient conditions. The output capacitor network
should be as close as possible to the load for the best results.
Since the CS52015-3 is a three terminal regulator, it is not
possible to provide true remote load sensing. Load regula-
tion is limited by the resistance of the conductors connect-
ing the regulator to the load. For best results the regulator
should be connected as shown in Figure 2.
4
Applications Information: continued
IOUT(max) is the maximum output current, for the application
Q is the maximum quiescent current at IOUT(max).
conductor
I
parasitic resistance
R
C
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
VIN
VOUT
VIN
CS52015-3
RLOAD
Each material in the heat flow path between the IC and the
outside environment has a thermal resistance. Like series
electrical resistances, these resistances are summed to
determine RQJA, the total thermal resistance between the
junction and the surrounding air.
1. Thermal Resistance of the junction to case, RQJC (¡C/W)
2. Thermal Resistance of the case to Heat Sink, RQCS (¡C/W)
3. Thermal Resistance of the Heat Sink to the ambient air,
Figure 2: Conductor parasitic resistance effects can be minimized with
the above grounding scheme for fixed output regulators.
RQSA (¡C/W)
Calculating Power Dissipation and Heat Sink Requirements
The CS52015-3 linear regulator includes thermal shutdown
and current limit circuitry to protect the device. High
power regulators such as these usually operate at high
junction temperatures so it is important to calculate the
power dissipation and junction temperatures accurately to
ensure that an adequate heat sink is used.
These are connected by the equation:
QJA = RQJC + RQCS + RQSA
R
(3)
The value for RQJA is calculated using equation (3) and the
result can be substituted in equation (1).
The case is connected to VOUT on the CS52015-3, and elec-
trical isolation may be required for some applications.
Thermal compound should always be used with high cur-
rent regulators such as these.
The value for RQJC is 3.5ûC/W. For a high current regulator
such as the CS52015-3 the majority of the heat is generated
in the power transistor section. The value for RQSA
depends on the heat sink type, while RQCS depends on fac-
tors such as package type, heat sink interface (is an insula-
tor and thermal grease used?), and the contact area
The thermal characteristics of an IC depend on the follow-
ing four factors:
between the heat sink and the package. Once these calcula-
tions are complete, the maximum permissible value of
1. Maximum Ambient Temperature TA (¡C)
2. Power dissipation PD (Watts)
RQJA can be calculated and the proper heat sink selected.
For further discussion on heat sink selection, see applica-
tion note ÒThermal Management for Linear Regulators.Ó
3. Maximum junction temperature TJ (¡C)
4. Thermal resistance junction to ambient RQJA (C/W)
These four are related by the equation
TJ = TA + PD ´ RQJA
(1)
The maximum ambient temperature and the power dissi-
pation are determined by the design while the maximum
junction temperature and the thermal resistance depend on
the manufacturer and the package type.
The maximum power dissipation for a regulator is:
P
D(max)={VIN(max)ÐVOUT(min)}IOUT(max)+VIN(max) Q
I
(2)
where
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
5
Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
3 Lead TO-220 (T) Straight
PACKAGE THERMAL DATA
3L
3L
3L
SOT-223
Thermal Data
TO-220 D2PAK
RQJC
RQJA
typ
typ
3.5
50
3.5
10 - 50*
15
156
ûC/W
ûC/W
*Depending on thermal properties of substrate. RQJA = RQJC + RQCA
1.40 (.055)
1.14 (.045)
4.83 (.190)
10.54 (.415)
4.06 (.160)
9.78 (.385)
3.96 (.156)
2.87 (.113)
3 Lead SOT-223 (ST)
3.71 (.146)
2.62 (.103)
6.55 (.258)
5.94 (.234)
6.70 (.264)
6.30 (.248)
14.99 (.590)
14.22 (.560)
3.15 (.124)
7.30 (.287)
6.70 (.264)
2.95 (.116)
1.52 (.060)
1.14 (.045)
6.17 (.243) REF
3.70 (.146)
3.30 (.130)
14.22 (.560)
13.72 (.540)
1.40 (.055)
1.14 (.045)
1.05 (.041)
0.85 (.033)
1.02 (.040)
0.63 (.025)
2.30 (.090)
0.56 (.022)
0.38 (.014)
2.79 (.110)
2.29 (.090)
0.35 (.014)
0.25 (.010)
1.70 (.067)
1.50 (.060)
5.33 (.210)
4.83 (.190)
2.92 (.115)
2.29 (.090)
1.30 (.051)
1.10 (.043)
0.85 (.033)
0.65 (.026)
0.10 (.004)
0.02 (.001)
10° MAX
4.60 (.181)
3 Lead D2PAK (DP)
10.31 (.406)
10.05 (.396)
1.40 (.055)
1.14 (.045)
1.68 (.066)
1.40 (.055)
8.53 (.336)
8.28 (.326)
15.75 (.620)
14.73 (.580)
2.74(.108)
2.49(.098)
1.40 (.055)
1.14 (.045)
2.79 (.110)
2.29 (.090)
0.91 (.036)
0.66 (.026)
2.54 (.100) REF
.254 (.010) REF
0.10 (.004)
0.00 (.000)
4.57 (.180)
4.31 (.170)
Ordering Information
Type Description
Part Number
CS52015-3GT3
1.5A, 3.3V output 3 L TO-220 Straight
CS52015-3GDP3 1.5A,3.3V output 3 L D2PAK
CS52015-3GDPR3 1.5A, 3.3V output 3 L D2PAK
(tape & reel)
Ch erry Sem icon du ctor Corporation reserves th e
righ t to m ake ch an ges to th e specification s with ou t
n otice. Please con tact Ch erry Sem icon du ctor
Corporation for th e latest available in form ation .
CS52015-3GST3
CS52015-3GSTR3 1.5A, 3.3V output 3 Lead SOT-223
1.5A, 3.3V output 3 Lead SOT-223
(tape & reel)
Rev. 2/17/98
© 1999 Cherry Semiconductor Corporation
6
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