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 4
and 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
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WDFN−6
3 x 3 mm
CASE 511AP
DPAK−5
LEAD 3 CROP
CASE 175AA
DPAK−5
TO−252
CASE 369AE
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•
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•
•
•
•
•
•
•
•
•
Guaranteed 1000 mA Continuous Output Current
V
OUT
: 0.8 V to 5.0 V
Dropout Voltage of 350 mV Typical at 1000 mA
±2.0%
Output Voltage Accuracy Over 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
DSP Core and I/O Voltages
FPGAs, ASICs
PDAs, Mobile Phones, GPS
Camcorders and Cameras
Hard Disk Drives
PIN CONNECTIONS
(Top Views)
EN
GND
BYP
1
VIN
ADJ
VOUT
Typical Applications
GND
(Tab)
GND
(Tab)
5
1
5
ADJ
VOUT
GND
VIN
EN
= P (CAT)
= Device Code
= Output Voltage
=
W = Adjustable
= Pb−Free Package
= Assembly Location
= Wafer Lot
= Year
= Work Week
Publication Order Number:
CAT6243/D
•
•
•
•
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1
ADJ
VOUT
GND
VIN
EN
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
MARKING DIAGRAMS
6243
AXXX
YWW
G
1
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
x
6243
y
G
A
L
Y
WW
x6243yG
ALYWW
x6243yG
ALYWW
*Pb−Free indicator, “G” or microdot “G”,
may or may not be present.
©
Semiconductor Components Industries, LLC, 2012
July, 2012
−
Rev. 5
1
CAT6243
VIN
C
IN
1
mF
VIN
ENABLE
CAT6243
C
OUT
2.2
mF
VOUT
VOUT
BYP
C
BYP
(Optional)
GND
ADJ
Figure 1. Application Schematic
VIN
VOUT
I
SENSE
Thermal
Shutdown
+
−
ADJ
EN
2.5 M
Enable
Logic
+
V
REF
−
BYP
GND
Figure 2. Simplified Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
Pin #
WDFN−6
1
Pin #
DPAK−5−4
5
Pin #
DPAK−5−5
5
Pin Name
EN
Description
The Enable Input. An active HIGH input, turning ON the LDO. This input
should be tied to V
IN
if the LDO is not intended to be shut off during normal
operation. A pull−down 2.5 MW resistor maintains the circuit in the OFF
state if the pin is left open.
Power Supply Ground; Device Substrate. The center pad is internally con-
nected to Ground and as such can cause short circuits to signal traces run-
ning beneath the IC. This pad is intended for heat sinking the IC to the PCB
and is typically connected to the PCB ground plane.
Bypass input. Placing a capacitor of 100 pF to 470 pF between BYP and
ground reduces noise on V
OUT.
This capacitor is optional and it increases
the turn−on time.
Regulated Output Voltage. A protection block eliminates any current flow
from output to input if V
OUT
> V
IN
.
Output Voltage Adjust Input. This input ties to the common point of a resistor
divider which determines the regulator’s output voltage. See Applications
section for details on selecting resistor values.
Positive Power Supply Input. Supplies power for V
OUT
as well as the regu-
lator’s internal circuitry.
2, PAD
3, TAB
3, TAB
GND
3
NC
NC
BYP
4
5
2
1
2
1
V
OUT
ADJ
6
4
4
V
IN
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2
CAT6243
Table 2. ABSOLUTE MAXIMUM RATINGS
Rating
Input Voltage Range (Note 1)
Output Voltage Range
Enable Input Range
Adjust Input Range
Bypass Input Range
Power Dissipation
Maximum Junction Temperature
Storage Temperature Range
ESD Capability, Human Body Model (Note 2)
ESD Capability, Machine Model (Note 2)
Lead Temperature Soldering
Reflow (SMD Styles Only), Pb−Free Versions (Note 3)
Symbol
V
IN
V
OUT
EN
ADJ
BYP
Value
−0.3
to 6.0
−0.3
to 6.0
−0.3
to 5.5 V or (V
IN
+ 0.3),
whichever is lower
−0.3
to 5.5 V
−0.3
to 5.5 V or (V
IN
+ 0.3),
whichever is lower
Internally Limited
150
−65
to 150
2
200
260
Unit
V
V
V
V
V
mW
°C
°C
kV
V
°C
PD
T
J(max)
T
STG
ESD
HBM
ESD
MM
T
SLD
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Refer to ELECTRICAL CHARACTERISTIS and APPLICATION INFORMATION for Safe Operating range.
2. This device series incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per AEC−Q100−002 (EIA/JESD22−A114)
ESD Machine Model tested per AEC−Q100−003 (EIA/JESD22−A115)
Latchup Current Maximum Rating:
≤150
mA per JEDEC standard: JESD78
3. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D
Table 3. THERMAL CHARACTERISTICS
Rating
Thermal Characteristics, WDFN−6, 3 x 3 mm
Thermal Resistance, Junction−to−Air: 1 in
2
/1 oz. copper (Note 4)
Thermal Reference, Junction−to−Case (Note 4)
Symbol
R
qJA
R
yJL
Value
55
10
Unit
°C/W
4. Values based on copper area of 645 mm
2
(or 1 in
2
) of 1 oz copper thickness and FR4 PCB substrate.
Table 4. OPERATING RANGES
(Note 5)
Rating
Input Voltage CAT6243 (Note 6)
Output Current
Output Voltage
Ambient Temperature
Symbol
V
IN
I
OUT
V
OUT
T
A
Min
1.8
0.1
0.8
−40
Max
5.5
1000
5.0
85
Unit
V
mA
V
°C
5. Refer to ELECTRICAL CHARACTERISTIS and APPLICATION INFORMATION for Safe Operating range.
6. Minimum V
IN_MIN
= 1.8 V or (V
OUT
+ V
DO
), whichever is higher.
Table 5. ELECTRICAL CHARACTERISTICS
(V
IN
= (V
OUT
+ 1 V) or V
IN_MIN
, whichever is higher, C
IN
= 1
mF,
C
OUT
= 2.2
mF,
for
typical values T
A
= 25°C, for
Bold
values T
A
=
−40°C
to 85°C; unless otherwise noted.)
Symbol
INPUT / OUTPUT
V
IN
V
OUT
V
OUT−ACC
V
ADJ
TC
OUT
I
OUT
Input Voltage
Output Voltage Range
Output Voltage Accuracy
Voltage at ADJ input
Output Voltage Temp. Coefficient
Output Current
0.0001
Initial accuracy, I
OUT
= 1 mA
1.8
0.8
−2
0.784
0.8
25
1
5.5
5.0
2
0.816
V
V
%
V
ppm/°C
A
Parameter
Conditions
Min
Typ
Max
Unit
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CAT6243
Table 5. ELECTRICAL CHARACTERISTICS
(V
IN
= (V
OUT
+ 1 V) or V
IN_MIN
, whichever is higher, C
IN
= 1
mF,
C
OUT
= 2.2
mF,
for
typical values T
A
= 25°C, for
Bold
values T
A
=
−40°C
to 85°C; unless otherwise noted.)
Symbol
INPUT / OUTPUT
V
R−LINE
Line Regulation
V
IN
= V
OUT
+ 1.0 V to 5.5 V,
I
OUT
= 10 mA
V
IN
= V
OUT
+ 1.0 V to 5.5 V,
I
OUT
= 10 mA
V
R−LOAD
V
DO
Load Regulation
V
OUT
= 1.2 V
V
OUT
= 2.5 V
V
OUT
= 3.3 V
V
OUT
= 1.2 V
V
OUT
= 2.5 V
V
OUT
= 3.3 V
I
ADJ
I
GND
ADJ Input Current
Ground Current
I
OUT
= 0
mA
I
OUT
= 0
mA
I
OUT
= 1000 mA
I
OUT
= 1000 mA
I
GND−SD
ISC
Shutdown Ground Current
Output short circuit current limit
V
EN
< 0.4 V
V
OUT
= 0 V
f = 1 kHz, BYP = 470 pF,
I
OUT
= 10 mA
f = 20 kHz, BYP = 470 pF,
I
OUT
= 10 mA
e
N
Output Noise Voltage for 1.8 V output
BW = 10 Hz to 100 kHz
BYP = 470 pF, I
OUT
= 10 mA
900
140
70
100
200
250
2
mA
mA
I
OUT
= 1 A
T
A
= 25°C
I
OUT
= 100
mA
to 1000 mA
I
OUT
= 100
mA
to 1000 mA
I
OUT
= 300 mA
T
A
= 25°C
−0.2
−0.35
1.5
±0.05
0.2
0.35
2
3
600
110
85
625
350
275
100
nA
mA
mV
%
%/V
Parameter
Conditions
Min
Typ
Max
Unit
PSRR AND NOISE
PSRR
Power Supply Rejection Ratio
CAT6243
54
42
45
mVrms
dB
UVLO, R
OUT
AND ESR
V
UVLO
R
OUT−SH
ESR
Under voltage lockout threshold
ON resistance of Discharge Transistor
C
OUT
equivalent series resistance
Logic High Level
Logic Low Level
Enable Input Current
Enable pull−down resistor
V
IN
= 1.8 to 5.5 V
V
IN
= 1.8 to 5.5 V
V
EN
= 0.4 V
V
EN
= V
IN
= 2.5 V
R
EN
TIMING
T
ON
Turn−On Time
C
BYP
= 0 pF
C
BYP
= 470 pF
THERMAL PROTECTION
T
SD
T
HYS
Thermal Shutdown
Thermal Hysteresis
145
10
°C
°C
230
1600
ms
0.15
1
2.5
5
1.65
150
500
1.75
V
W
mW
ENABLE INPUT
V
HI
V
LO
I
EN
1.6
0.4
1
3
MW
V
V
mA
7. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at T
J
= T
A
= 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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4
CAT6243
TYPICAL CHARACTERISTICS
(shown for V
OUT
= 2.5 V, V
IN
= 3.5 V, I
OUT
= 1 mA, C
IN
= 1
mF,
C
OUT
= 4.7
mF,
C
BYP
= 0, and T
A
= 25°C unless otherwise specified.)
2.55
2.54
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
0
100 200 300 400 500 600 700 800 900 1000
OUTPUT LOAD CURRENT (mA)
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
2.51
2.52
2.50
2.49
2.48
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
Figure 3. Output Voltage vs. Load Current
150
140
GROUND CURRENT (mA)
120
110
100
90
80
70
60
50
GROUND CURRENT (mA)
130
100
90
80
70
60
50
40
30
20
10
0
Figure 4. Output Voltage vs. Input Voltage
0
100 200 300 400 500 600
700 800 900 1000
0
0.5
1.0 1.5 2.0
2.5 3.0
3.5 4.0
4.5 5.0 5.5
OUTPUT LOAD CURRENT (mA)
INPUT VOLTAGE (V)
Figure 5. Ground Current vs. Load Current
400
DROPOUT VOLTAGE (mV)
350
300
250
200
150
100
50
0
0
100 200 300 400 500 600 700 800 900 1000
OUTPUT LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
3.0
2.5
Figure 6. Ground Current vs. Input Voltage
I
OUT
= 1 mA
2.0
1.5
1.0
0.5
0
I
OUT
= 1000 mA
0
0.5
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Figure 7. Dropout Voltage vs. Load Current
Figure 8. Dropout Characteristics
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