CS5201-3GT3 [CHERRY]
1A, 3.3V Fixed Linear Regulator; 1A ， 3.3V固定线性稳压器
| 型号： | CS5201-3GT3 |
| 厂家： | 
CHERRY SEMICONDUCTOR CORPORATION |
| 描述： | 1A, 3.3V Fixed Linear Regulator |
| 文件： | 总6页 (文件大小：162K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CS5201-3
1A, 3.3V Fixed Linear Regulator
Description
Features
■ Output Current to 1A
The CS5201-3 linear regulator
The maximum quiescent current
is only 10mA at full load.
Device protection includes over-
current and thermal shutdown.
provides a 1A@ 3.3V reference
at 1A with an output voltage
accuracy of ±1.5%.
■ Output Accuracy to ±1.5%
Over Temperature
■ Dropout Voltage (typical)
This regulator is intended for
use as a post regulator and
microprocessor supply. The fast
loop response and low dropout
voltage make this regulator
ideal for applications where low
voltage operation and good
transient response are impor-
tant.
The CS5201-3 is pin compatible
with the LT1086 family of linear
regulators.
1.0V @ 1A
■ Fast Transient Response
The regulator is available in
TO-220, surface mount D2, and
SOT-223 packages.
Fault Protection
Current Limit
■
Thermal Shutdown
The circuit is designed to oper-
ate with dropout voltages less
than 1.2V at 1A output current.
Package Options
Application Diagram
3L TO-220
3L D2PAK
Tab (VOUT
)
Tab (VOUT
)
V
VIN
OUT
1
3.3V
@ 1A
CS5201-3
GND
1
3L SOT-223
22mF
10mF
5V
Tab (VOUT
)
5V
CS5201 -3
1
2
Gnd
VOUT (Tab)
3
VIN
1
Consult factory for other fixed output
voltage versions.
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. 2/18/98
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 (Human Body Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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 = 1A.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
■ Fixed Output Voltage
Output Voltage
(Notes 1 and 2)
VINÐVOUT=1.5V;
0²IOUT²1A
3.250
(-1.5%)
3.300
3.350
(+1.5%)
V
Line Regulation
2V²VINÐVOUT²3.7V; IOUT=10mA
VINÐVOUT=2V; 10mA²IOUT²1A
0.02
0.04
0.20
0.4
%
%
Load Regulation
(Notes 1 and 2)
Dropout Voltage (Note 3)
Current Limit
IOUT=1A
1.0
1.2
V
VINÐVOUT=3V
IOUT=10mA
1.0
3.1
A
Quiescent Current
5.0
10.0
mA
%/W
dB
Thermal Regulation (Note 4)
Ripple Rejection (Note 4)
30ms pulse; TA=25¡C
0.002
80
0.020
f=120Hz; IOUT=1A; VINÐVOUT=3V;
VRIPPLE=1VPP
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 output
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
2
Gnd
VOUT
VIN
Ground connection.
Regulated output voltage (case).
Input voltage.
2
Block Diagram
VOUT
VIN
Output
Current
Limit
Thermal
Shutdown
-
+
Error
Amplifier
Bandgap
Reference
Gnd
Typical Performance Characteristics
1.00
0.95
0.10
0.08
T
= 0°C
CASE
0.06
0.04
0.02
0.00
-0.02
-0.04
T
= 25°C
CASE
0.90
0.85
0.80
0.75
-0.06
-0.08
-0.10
-0.12
T
= 125°C
CASE
200
400
600
(mA)
800
1000
0
0
10 20 30 40 50 60 70 80 90 100 110 120 130
I
OUT
T
(°C)
J
Dropout Voltage vs. Output Current
Output Voltage vs. Temperature
0.100
0.075
85
75
65
55
0.050
T
= 25°C
= 1A
CASE
T
= 125°C
CASE
45
35
I
OUT
(V Ð V
V
) = 3V
OUT
IN
T
= 25°C
CASE
= 1.0V
PP
0.025
0.000
RIPPLE
25
15
T
= 0°C
CASE
1
2
3
4
5
6
0
1
2
10
10
10
10
10
10
Output Current (A)
Frequency (Hz)
Load Regulation vs. Output Current
Ripple Rejection vs. Frequency
3
Typical Performance Characteristics: continued
3.5
3.3
3.1
2.9
200
100
0
2.7
2.5
2.3
2.1
1.9
1.7
-100
-200
1000
500
0
0
1
2
3
4
5
6
7
8
9
10
1.5
Time mS
1.0
1.5
2.0
2.5
- V
3.0
3.5
4.0
COUT =CIN =22mF Tantalum
V
(V)
IN
OUT
Transient Response
Short Circuit Current vs. VIN - VOUT
Applications Information
The CS5201-3 linear regulator provides a fixed 3.3V out-
put voltage at currents up to 1A. The regulator is protect-
ed 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 CS5201-3 linear regulator, the discharge path is
The CS5201-3 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.
through a large junction and protection diodes are not
usually needed. If the regulator is used with large values
of output capacitance and the input voltage is instanta-
neously shorted to ground, damage can occur. In this case,
a diode connected as shown in Figure 1 is recommended.
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
CS5201-3
C2
GND
A 22µF tantalum capacitor will work for most applications,
but with high current regulators such as the CS5201-3 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 net-
work should be as close as possible to the load for the best
results.
Since the CS5201-3 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
The maximum power dissipation for a regulator is:
PD(max)={VIN(max)ÐVOUT(min)}IOUT(max)+VIN(max) Q
where
conductor
parasitic resistance
R
I
(2)
C
VIN
VOUT
VIN
CS5201-3
RLOAD
V
V
IN(max) is the maximum input voltage,
OUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current, for the application
IQ is the maximum quiescent current at IOUT(max).
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.
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.
Figure 2. Conductor parasitic resistance effects can be minimized with
the above grounding scheme for fixed output regulators.
Calculating Power Dissipation and Heat Sink Requirements
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,
The CS5201-3 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.
R
QSA (¡C/W)
The case is connected to VOUT on the CS5201-3, and electri-
cal isolation may be required for some applications.
Thermal compound should always be used with high cur-
rent regulators such as these.
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 thermal characteristics of an IC depend on the follow-
ing four factors:
The value for RQJC is 3.5ûC/W. For a high current regula-
tor such as the CS5201-3 the majority of the heat is generat-
ed 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
1. Maximum Ambient Temperature TA (¡C)
2. Power dissipation PD (Watts)
3. Maximum junction temperature TJ (¡C)
4. Thermal resistance junction to ambient RQJA (C/W)
between the heat sink and the package. Once these calcula-
tions are complete, the maximum permissible value of
These four are related by the equation
R
QJA can be calculated and the proper heat sink selected.
TJ = TA + PD ´ RQJA
(1)
For further discussion on heat sink selection, see applica-
tion note ÒThermal Management for Linear Regulators.Ó
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.
5
Package Specification
PACKAGE DIMENSIONS IN mm(INCHES)
PACKAGE THERMAL DATA
3L
3L
3L
Thermal Data
TO-220 D2PAK SOT-223
RQJC
RQJA
typ
typ
3.5
50
3.5
10 - 50*
15
156
ûC/W
ûC/W
3 Lead TO-220 (T) Straight
*Depending on thermal properties of substrate. RQJA = RQJC + RQCA
3 Lead D2PAK (DP)
1.40 (.055)
1.14 (.045)
4.83 (.190)
10.54 (.415)
4.06 (.160)
9.78 (.385)
10.31 (.406)
10.05 (.396)
1.40 (.055)
1.14 (.045)
3.96 (.156)
2.87 (.113)
3.71 (.146)
2.62 (.103)
1.68 (.066)
1.40 (.055)
6.55 (.258)
5.94 (.234)
14.99 (.590)
14.22 (.560)
8.53 (.336)
8.28 (.326)
15.75 (.620)
14.73 (.580)
2.74(.108)
2.49(.098)
1.52 (.060)
1.14 (.045)
6.17 (.243) REF
1.40 (.055)
1.14 (.045)
14.22 (.560)
13.72 (.540)
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
1.02 (.040)
0.63 (.025)
0.56 (.022)
0.38 (.014)
2.79 (.110)
2.29 (.090)
0.10 (.004)
0.00 (.000)
4.57 (.180)
4.31 (.170)
5.33 (.210)
4.83 (.190)
2.92 (.115)
2.29 (.090)
3 Lead SOT-223 (ST)
6.70 (.264)
6.30 (.248)
3.15 (.124)
2.95 (.116)
7.30 (.287)
6.70 (.264)
3.70 (.146)
3.30 (.130)
1.05 (.041)
0.85 (.033)
2.30 (.090)
0.35 (.014)
0.25 (.010)
1.70 (.067)
1.50 (.060)
1.30 (.051)
1.10 (.043)
0.85 (.033)
0.65 (.026)
0.10 (.004)
0.02 (.001)
10° MAX
4.60 (.181)
Ordering Information
Type Description
Part Number
CS5201-3GT3
CS5201-3GDP3
1A, 3.3V output 3 L TO-220 Straight
1A, 3.3V output 3 L D2PAK
CS5201-3GDPR3 1A, 3.3V output 3 L D2PAK (tape & reel)
Cherry Semiconductor Corporation reserves the right to
make changes to the specifications without notice. Please
contact Cherry Semiconductor Corporation for the latest
available information.
CS5201-3GST3 1A, 3.3V output 3 L SOT-223
CS5201-3GSTR3 1A, 3.3V output 3 L SOT-223 (tape & reel)
Rev. 2/18/98
© 1999 Cherry Semiconductor Corporation
6
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