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PDF CAT6243 Data sheet ( Hoja de datos )
| Número de pieza | CAT6243 | |
| Descripción | 1 Amp Adjustable CMOS LDO Voltage Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CAT6243
1 Amp Adjustable CMOS
LDO Voltage Regulator
Description
The CAT6243 is a low dropout CMOS voltage regulator providing
up to 1000 mA of output current with fast response to load current and
line voltage changes. CAT6243 offers a user adjustable output voltage
from 0.8 V to 5.0 V and its low quiescent current make CAT6243 ideal
for energy conscious designs. CAT6243 is available in a DPAK−5
5−lead packages and in a space saving 3 mm x 3 mm WDFN−6
package with a power pad for heat sinking to the PCB.
Features
• Guaranteed 1000 mA Continuous Output Current
• VOUT: 0.8 V to 5.0 V
• Dropout Voltage of 350 mV Typical at 1000 mA
• ±2.0% Output Voltage Accuracy at Room Temperature
• No−load Ground Current of 70 mA Typical
• Full−load Ground Current of 140 mA Typical
• “Zero” Current Shutdown Mode
• Under Voltage Lockout
• Stable with Ceramic Output Capacitors
• Current Limit and Thermal Protection
• 4 and 5 Lead DPAK−5 and 3 mm x 3 mm WDFN−6 Power Packages
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
• DSP Core and I/O Voltages
• FPGAs, ASICs
• PDAs, Mobile Phones, GPS
• Camcorders and Cameras
• Hard Disk Drives
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WDFN−6
3 x 3 mm
CASE 511AP
DPAK−5
TO−252
CASE 369AE
PIN CONNECTIONS
(Top Views)
EN
GND
BYP
1
VIN
ADJ
VOUT
GND
(Tab)
15
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
6243
AXXX
YWW
G
1
MARKING DIAGRAMS
6243
A
XXX
Y
WW
G
= Specific Device Code
= Assembly Location
= Last Three Digits of
= Assembly Lot Number
= Production Year (Last Digit)
= Production Week (Two Digits)
= Pb−Free Package
*Pb−Free indicator, “G” or microdot “G”,
may or may not be present.
x6243yG
ALYWW
x
6243
y
G
A
L
Y
WW
= P (CAT)
= Device Code
= Output Voltage
= W = Adjustable
= Pb−Free Package
= Assembly Location
= Wafer Lot
= Year
= Work Week
© Semiconductor Components Industries, LLC, 2015
February, 2015 − Rev. 8
1
Publication Order Number:
CAT6243/D
1 page  
CAT6243
Table 5. ELECTRICAL CHARACTERISTICS (VIN = (VOUT + 1 V) or VIN_MIN, whichever is higher, CIN = 1 mF, COUT = 2.2 mF, for
typical values TA = 25°C, for Bold values TA = −40°C to 85°C; unless otherwise noted.)
Symbol
Parameter
Conditions
Min Typ Max Unit
ENABLE INPUT
VHI
VLO
IEN
REN
TIMING
Logic High Level
Logic Low Level
Enable Input Current
Enable pull−down resistor
VIN = 1.8 to 5.5 V
VIN = 1.8 to 5.5 V
VEN = 0.4 V
VEN = VIN = 2.5 V
1.6
0.4
0.15 1
13
2.5
V
V
mA
MW
TON Turn−On Time
THERMAL PROTECTION
CBYP = 0 pF
CBYP = 470 pF
230
1600
ms
TSD Thermal Shutdown
145 °C
THYS
Thermal Hysteresis
10 °C
7. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at TJ = TA = 25_C. Low
duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.
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5
5 Page 
CAT6243
APPLICATIONS INFORMATION
Input Decoupling (CIN)
A ceramic or tantalum 1 mF capacitor is recommended and
should be connected close to the CAT6243’s package.
Higher capacitance and lower ESR will improve the overall
line and load transient response.
Output Decoupling (COUT)
The minimum output decoupling value is 2.2 mF and can
be augmented to fulfill stringent load transient
requirements. The regulator works with ceramic chip
capacitors. Larger values, up to 22 mF, improve noise
rejection and load regulation transient response. The
CAT6243 is a highly stable regulator and performs well over
a wide range capacitor Equivalent Series Resistances (ESR).
No−Load Regulation Considerations
The CAT6243 adjustable regulator will operate properly
under conditions where the only load current is through the
resistor divider that sets the output voltage. However, in the
case where the CAT6243 is configured to provide a 0.8 V
output, there is no resistor divider and the ADJ pin is
connected to VOUT. If the part is enabled under no−load
conditions, leakage current through the pass transistor at
junction temperatures above 85°C can approach several
microamperes, especially as junction temperature
approaches 150°C. If this leakage current is not directed into
a load, the output voltage will rise above nominal until a load
is applied. For this reason it is recommended that a minimum
load of 100 mA be present at all times. Normally the voltage
setting resistor divider will serve this function but if no
divider is used (VOUT = 0.8 V) then an external load of 8 KW
should be provided.
Output Voltage Adjust
The output voltage can be adjusted from 0.8 V to 5.0 V
using resistors between the output and the ADJ input. The
output voltage and resistors are chosen using Equation 1 and
Equation 2.
ǒ ǓVOUT + 0.8
1
)
R1
R2
) ǒIADJ
R1Ǔ
(eq. 1)
R2
^
0.8 V
IDIV
ǒ ǓR1 ^ R2
VOUT
0.8 V
*
1
(eq. 2)
(eq. 3)
VIN
VIN VOUT
CIN ENABLE
CAT6243
BYP
ADJ
CBYP
GND
VOUT
R1
COUT
R2
Figure 27. Adjustable Output Resistor Divider
Input bias current, IADJ, for all practical designs can be
ignored (IADJ = 0). Considering that the lowest
recommended IOUT value is 100 mA, then, when there is no
load on VOUT, IDIV must be 100 mA to keep CAT6243 in
regulation. This then sets R2’s value using Equation 2 to
8 KW, which minimizes output noise. Use Equation 3 to find
the required value for R1. If needed, lower values for IDIV
can be considered, but not lower than 10 mA. The price will
be worse values for both load regulation and TCOUT.
Thermal Considerations
As power in the CAT6243 increases, it may become
necessary to provide thermal relief. The maximum power
dissipation supported by this device is dependent upon
board design and layout. Mounting pad configuration on the
PCB, the board material, and the ambient temperature affect
the rate of junction temperature rise for the part. When the
CAT6243 has good thermal conductivity through the PCB,
the junction temperature will be relatively low even with
high power applications. The maximum dissipation the
CAT6243 can handle is given by:
ƪ ƫTJ(MAX) * TA
PD(MAX) +
RqJA
(eq. 4)
Since TJ is not recommended to exceed 125°C, then with
CAT6243 soldered to 645 mm2 (1 sq inch), 1 oz copper area,
FR4 PCB material can dissipate in excess of 1 W when the
ambient temperature (TA) is 25°C. Note that this assumes the
pad in the center of the package is soldered to the dissipating
copper foil. See Figure below for RqJA versus PCB area for
heat dissipating areas smaller than 645 mm2. Power
dissipation can be calculated from the following equations:
PD [ VIN(IGND ) IOUT) ) IOUT(VIN * VOUT) (eq. 5)
or
VIN(MAX)
[
PD(MAX) ) (VOUT
IOUT ) IGND
IOUT)
(eq. 6)
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| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet CAT6243.PDF ] | |
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