CAT6201
300 mA / 13 V Adjustable
CMOS LDO Regulator
Description
The CAT6201 is a 13 V rated 300 mA CMOS low dropout regulator
that provides fast response time to load current and line voltage
changes in an automotive environment.
CAT6201 features a low R
ON
P−channel pass element with internal
control circuitry which prevents reverse current flow should the
voltage at V
OUT
exceed V
IN
as in the case of the car’s battery voltage
accidentally being applied to V
OUT
.
Thermal protection and current limiting circuitry combine to protect
the pass device against faults and abuse. Current limiting is user
controlled through a single resistor to ground. A fault output (FLT)
provides an alert should an over−current event or thermal shutdown
occur.
CAT6201 comes on−line gracefully even though it may be driving
heavy capacitive loads thanks to built−in soft−start circuitry. Its output
is protected against accidental connection to voltages greater than V
IN
and will not conduct current backwards into its supply.
CAT6201 is available in 8−pad 2 mm x 3 mm TDFN package.
Features
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TDFN−8
VP2 SUFFIX
CASE 511AK
PIN CONNECTIONS
VIN
FLT
EN
BYP
TDFN−8
(Top View)
1
VOUT
VADJ
ILIM
GND
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Guaranteed 300 mA Continuous Output Current
Low Dropout Voltage of 250 mV Typical at 300 mA
Input Voltage Range: 3.3 V to 13.5 V
User Adjustable Output Voltage
User Programmable Current Limit
Fault Output to Indicate Under−voltage, Current Limiting or Thermal
Shutdown has Occurred
Fault Blanking: 3 ms
V
OUT
Withstands Battery Fault Voltages of up to 14 V
Soft−Start Prevents Current Surges
Stable with Ceramic Output Capacitor
±1.5%
Output Voltage Initial Accuracy
±2.5%
Accuracy Over Temperature
Thermal Protection
8 Pad TDFN Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
MARKING DIAGRAMS
HKB
LAA
YM
G
HKB
L
AA
Y
M
G
= CAT6201VP2−GT3
= Assembly Location
= Last Two Digits of
=
Assembly Lot Number
= Production Year (Last Digit)
= Production Month (1−9, O, N, D)
= Pb−Free Microdot
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
©
Semiconductor Components Industries, LLC, 2012
September, 2012
−
Rev. 2
1
Publication Order Number:
CAT6201/D
CAT6201
Table 1. PIN FUNCTION DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
Pad
Pin Name
VIN
FLT
EN
BYP
GND
ILIM
VADJ
VOUT
−
Supply voltage input
Fault indicator (active low)
Enable input (active high)
A capacitor between BYP and GND controls the regulator’s turn−on speed and improves PSRR
Ground reference
Current limit control pin
Output voltage adjustment
LDO Output Voltage
Backside pad in center of package provides thermal contact for cooling, typically via the PCB ground
plane. This pad is electrically active and connected to GND internally. An external Ground connection
is not required and the pad may be left floating.
Description
Table 2. ABSOLUTE MAXIMUM RATINGS
Rating
V
IN
, V
OUT
All other pins
Junction Temperature, T
J
Power Dissipation, P
D
Storage Temperature Range, T
S
Lead Temperature (soldering, 5 sec.)
ESD Rating (Human Body Model)
ESD Rating (Machine Model)
Value
0 to 16
−0.3
to +6.0
+150
Internally Limited (Note 1)
−65
to +150
260
1000
200
Unit
V
V
_C
mW
_C
_C
V
V
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. The maximum allowable power dissipation at any T
A
(ambient temperature) is P
Dmax
= (T
Jmax
– T
A
) /
θ
JA
. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
Table 3. RECOMMENDED OPERATING CONDITIONS
(Note 2)
Parameter
V
IN
, V
OUT
All other pins
Junction Temperature Range, T
J
Package Thermal Resistance (SOIC),
θ
JA
Package Thermal Resistance (TDFN),
θ
JA
2. The device is not guaranteed to work outside its operating rating.
Range
3.3 to 13.5
0 to 6.0
−40
to +125
235
92
Unit
V
V
_C
_C/W
_C/W
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CAT6201
Pin Function
VIN
is the supply pin for both the LDO’s operation and the
load the LDO is driving. It is recommended that a 1
mF
ceramic bypass capacitor be placed between the V
IN
pin and
ground in close proximity to the device. When using longer
connections to the power supply, C
IN
value can be increased
without limit. The operating input voltage range is from
3.3 V to 13.5 V.
FLT
is an active low open−drain output indicating one of 3
fault conditions:
1. Input under−voltage: input is below the intended
output voltage
2. Over−current. Brief over−current events are
masked by a 3 ms time delay. CAT6201 will limit
current anytime the load tries to draw more than
the maximum allowed, however reporting of this
event will occur only if the event lasts longer than
the delay timer. Events terminating before the
timer reaches its full count are ignored and the
timer is reset.
3. Over−temperature shutdown has occurred.
EN
is an active HIGH logic level input for switching the
regulator’s output between ON and OFF. A weak internal
pull down assures that if EN pin is left open, the circuit is
disabled.
BYP
controls the soft−start feature for the regulator. When
large capacitive loads are present at the regulator’s output,
enabling the regulator will produce large current surges on
the V
IN
supply line. To reduce these surges the regulator can
be turned on gently by connecting a capacitor between the
BYP pin and ground. The larger the capacitance value the
more slowly V
OUT
approaches its programmed value. The
table below gives a list of common capacitor values and their
resulting turn−on times. If the soft−start feature is not
desired, this pin should be left floating.
Capacitance [nF]
0
10
100
t
ON
[ms]
0.2
1
10
of its nominal value and should not be confused with I
SC
, the
short circuit current, measured at V
OUT
= 0 V, which is
typically 100 mA greater than I
LIM
.
A resistor R
EXT
placed between I
LIM
and GND selects the
trip current according to a formula:
I
LIM
+
I
LIM0
)
Current_Limit_Factor(CLF)
R
EXT
(eq. 1)
I
LIM0
is the built−in minimum current limit (typically
150 mA), and CLF is a numerical value (typical 30,000
Volts) which relates the allowable load current to a
resistance value. The value of this resistor is determined by
the following equation:
R
EXT
(W)
+
CLF(V)
I
LIM
(A)
*
I
LIM0
(A)
(eq. 2)
It is recommended that I
LIM
be set to at least 50% higher
than the maximum intended continuous I
OUT
.
Example: Set I
LIMIT
= 600 mA
R
EXT
(W)
+
30, 000 V
+
68 KW
0.6 A
*
0.15 A
(eq. 3)
VADJ
is the output voltage control pin. A resistor divider
placed between VOUT and GND whose center point
connects to VADJ sets the LDO regulator’s output voltage.
Typical VADJ value is 1.25 V. The current through the
resistor divider can be anywhere between 10
mA
and 1 mA.
The higher this current is, the lower the noise.
For best performance R1 and R2 should have similar
temperature coefficients, otherwise output voltage accuracy
will be compromised.
V
OUT
+
V
ADJ
1
)
R
1
R
2
(eq. 4)
GND
is the ground reference for the LDO in the TDFN
package, center metal pad is internally connected to GND.
If electrical contact is made with this pad, it should be to
GND and/or the ground plane of the PCB. Connection to the
ground plane enhances thermal conductivity drawing heat
out of the package and into the surrounding PCB.
ILIM
stands for Current Limit and is the control input for
setting the point at which the current limit is invoked. I
LIM
is defined as the current at which V
OUT
is still within 80%
VOUT
is the LDO regulator output. A small 2.2
mF
ceramic
bypass capacitor is required between VOUT and ground.
For better transient response, its value can be increased to
4.7
mF.
This capacitor should be located near the device.
VOUT is protected against short circuits and over−temp
operation by internal circuitry. In the event of an
over−current, the LDO behaves like a current source,
limiting current at the output. The maximum current
allowed is set by R
EXT
, the resistor between I
LIM
and GND.
If the load attempts to draw more than the allowed current,
VOUT and IOUT decrease together and thus limit the total
power delivered.
VOUT is protected against the application of voltages
greater than VIN. For example, in automotive applications,
if CAT6201 is powering a remote load and damage occurs
to a wiring harness shorting a powered line, Battery + for
instance, to VOUT, CAT6201 will not be damaged by this
higher voltage being applied to VOUT.
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