CAT6220
300 mA Adjustable Voltage
LDO Regulator
Description
The CAT6220 is a 300 mA CMOS low dropout regulator whose
output voltage is user adjustable that provides fast response time
during load current and line voltage changes.
With 1
mA
of shutdown current, an internal no−load operating
current of only 10
mA,
and full−load operating current of 40
mA,
the
CAT6220 is ideal for battery−operated devices with supply voltages
from 2.3 V to 6.5 V.
The CAT6220 offers 1% initial accuracy and low dropout voltage,
270 mV typical at 300 mA. Stable operation is provided with a small
value ceramic capacitor, reducing required board space and
component cost.
Other features include current limit and thermal protection.
The device is available in the low profile (1 mm max height) 5−lead
TSOT−23 and 6−pad 2 mm x 2 mm TDFN packages.
Features
http://onsemi.com
5
1
TSOT−23
TD SUFFIX
CASE 419AE
1
TDFN−6
VP5 SUFFIX
CASE 511AH
•
•
•
•
•
•
•
•
•
•
•
Guaranteed 300 mA Output Current
Low Dropout Voltage of 270 mV at 300 mA
Stable with Ceramic Output Capacitor
No−load Ground Current of 10
mA
Typical
Full−load Ground Current of 40
mA
Typical
±1.0%
Output Voltage Initial Accuracy
±2.0%
Accuracy over Temperature
“Zero” Current Shutdown Mode
Current Limit and Thermal Protection
5−lead TSOT−23 and 6−pad TDFN Packages
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Toys
Consumer Electronics
Cellular Phones
Battery−powered Devices
V
IN
2.3 V to 6.5 V
1
mF
VIN
VOUT
R1
1
mF
R2
OFF ON
EN
GND
V
OUT
PIN CONNECTIONS
V
IN
GND
EN
TSOT−23
EN
GND
V
IN
TDFN−6
(Top Views)
1
TAB
ADJ
NC
V
OUT
ADJ
1
V
OUT
Applications
•
•
•
•
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
CAT6220
ADJ
Figure 1. Typical Application Circuit
©
Semiconductor Components Industries, LLC, 2011
December, 2011
−
Rev. 1
1
Publication Order Number:
CAT6220/D
CAT6220
Table 1. PIN DESCRIPTIONS
Package Pin #
Pin Name
VIN
GND
EN
ADJ
NIC
VOUT
GND
TSOT
1
2
3
4
−−
5
−−
TDFN
3
2
1
6
5
4
PAD
Supply voltage input.
Ground reference. All GND pins must be grounded.
Enable input (active high)
Digital programming input
No Internal Connection. A voltage or signal applied to this pin will have no effect upon
device operation.
Output Voltage Adjustment.
Center pad or tab; for heat sinking
Function
Pin Function
VIN
is the supply pin for the LDO. A small 1
mF
ceramic
bypass capacitor is required between the V
IN
pin and ground
near 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 2.3 V to 6.5 V.
EN
is the enable control logic (active high) for the regulator
output. Enable is a high impedance input and must not be left
unconnected. Floating EN will result in unpredictable action
at VOUT.
VOUT
is the LDO regulator’s output. Output voltage is set
by two external resistors arranged as a voltage divider
between VOUT and Ground. The center point of the divider
is connected to ADJ as shown in Figure 2. The minimum
recommended current through resistors is 5
mA.
The ratio of
the resistors is set by the formula:
V
OUT
+
1.24 V 1
)
R
1
R
2
A small 1
mF
ceramic bypass capacitor is required
between the VOUT pin and ground. For better transient
response, its value can be increased to 2.2
mF.
This capacitor
should be located near the device.
GND
is the ground reference for the LDO. This pin must be
connected to the system ground line or the ground plane of
the PCB.
The backside center pad of the TDFN package is
internally connected to the GND pin. Any PCB connection
to this pad must be either floating or at GND potential.
ADJ
is the LDO’s voltage control input. This pin is
connected to the center of the resistor voltage divider R1,
R2. A 10 pF capacitor connected in parallel with R1 will
improve the transient load regulation for VOUT
≤
2 V.
Thermal and Short Circuit Protection
VIN
VOUT
R1
V
OUT
CAT6220
ADJ
1
mF
R2
EN
GND
Figure 2. R1 and R2 Set CAT6220’s Output Voltage
CAT6220 is equipped with thermal protection and
over−current limiting circuitry.
In the event of a short circuit CAT6220 will limit its output
current to approximately 400 mA. If the short circuit persists
CAT6220’s internal temperature will rise and if the chip’s
temperature reaches 140°C CAT6220 will shut off all
current to the load which protects the system and allows the
LDO to cool down. When the LDO’s internal temperature
drops below 130°C the LDO automatically turns ON again.
If the short circuit is still present another thermal cycle will
ensue. This will continue until either the short circuit is
removed or the Enable pin is taken LOW.
For the TSOT23−5 package, a continuous 300 mA output
current may turn−on the thermal protection. If this happens
the LDO will respond by shutting off power to the load and
thermal cycling will begin.
http://onsemi.com
2
CAT6220
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
V
IN
V
EN
, V
OUT
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)
Rating
0 to 7
−0.3
to V
IN
+ 0.3
+150
Internally Limited (Note 1)
−65
to +150
260
2
200
Unit
V
V
_C
mW
_C
_C
kV
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
I
OUT
V
EN
Junction Temperature Range, T
J
Package Thermal Resistance (TSOT23−5),
θ
JA
Package Thermal Resistance (TDFN−6),
θ
JA
2. The device is not guaranteed to work outside its operating rating.
Range
2.3 to 6.5
0.005 to 300
0 to V
IN
−40
to +140
280
160
Unit
V
mA
V
_C
_C/W
_C/W
http://onsemi.com
3
CAT6220
C
OUT
= 1
mF,
ambient temperature of 25°C (over recommended operating conditions unless specified otherwise).
Bold numbers
apply
for the entire junction temperature range.)
Symbol
V
ADJ
V
ADJ
I
ADJ
TC
OUT
V
R−LINE
V
R−LOAD
V
DROP
I
GND
Parameter
Adjustable Voltage
Adjustable Voltage Accuracy
Conditions
I
OUT
= 100
mA
Initial accuracy
−1.5
−2.5
ADJ pin Input Current
Output Voltage Temp. Coefficient
Line Regulation
V
IN
= V
OUT
+ 1.0 V to 6.5 V
I
OUT
= 100
mA
to 300 mA
I
OUT
= 300 mA
I
OUT
= 5
mA
I
OUT
= 300 mA
I
GND−SD
PSRR
Shutdown Ground Current
V
EN
< 0.4 V
f = 100 Hz
f = 1 kHz
I
SC
T
ON
e
N
R
OUT−SH
ESR
Output short circuit current limit
Turn−On Time
Output Noise Voltage
Shutdown Switch Resistance
C
OUT
equivalent series resistance
Logic High Level
V
IN
= 2.3 to 6.5 V
V
IN
= 2.3 to 6.5 V, 0°C to +125°C
junction temperature
V
LO
I
IN
Logic Low Level
Input Current
V
IN
= 2.3 to 6.5 V
V
LOGIC
= 0.4 V
V
LOGIC
= V
IN
THERMAL PROTECTION
T
SD
T
HYS
Thermal Shutdown
Thermal Hysteresis
140
10
°C
°C
0.15
1.5
5
BW = 10 Hz to 100 kHz,
V
OUT
= 1.8 V, I
OUT
= 10 mA
V
OUT
= 0 V
62
48
500
150
150
250
500
700
mA
ms
mVrms
W
mW
−0.2
−0.35
Load Regulation
0.9
1
40
±0.1
+0.2
+0.35
1.5
2.2
Dropout Voltage (Note 4)
270
350
500
Ground Current
10
15
20
40
100
1
2
Power Supply Rejection Ratio
dB
mA
mA
mV
%
Min
Typ
1.24
+1.5
+2.5
50
nA
ppm/°C
%/V
Max
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(Note 3) (V
IN
= V
OUT
+ 1.0 V, V
EN
= High, I
OUT
= 100
mA,
C
IN
= 1
mF,
Unit
V
%
DIGITAL INPUT
V
HI
1.8
1.6
0.4
1
4
V
mA
V
3. Specification for 2.5 V output version unless specified otherwise.
4. Dropout voltage is defined as the input−to−output differential at which the output voltage drops 2% below its nominal value measured at 1 V
differential. During test, the input voltage stays always above the minimum 2.3 V.
http://onsemi.com
4
CAT6220
TYPICAL CHARACTERISTICS
(V
IN
= 3.5 V, R1 = R2 = 250 KW, I
OUT
= 100
mA,
C
IN
= 1
mF,
C
OUT
= 1
mF,
T
A
= 25°C unless otherwise specified.)
3.0
2.5
OUTPUT VOLTAGE (V)
2.0
1.5
1.0
0.5
0
2.53
2.52
OUTPUT VOLTAGE (V)
4
5
6
7
2.51
2.50
2.49
2.48
2.47
100
mA
300 mA
0
1
2
3
2
3
4
5
6
7
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 3. Dropout Characteristics
40
35
GROUND CURRENT (mA)
30
25
20
15
10
5
0
0
1
2
3
4
5
6
7
OUTPUT VOLTAGE (V)
2.55
2.54
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
Figure 4. Line Regulation
0
50
100
150
200
250
300
INPUT VOLTAGE (V)
OUTPUT LOAD CURRENT (mA)
Figure 5. Ground Current vs. Input Voltage
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
GROUND CURRENT (mA)
50
45
40
35
30
25
20
15
10
5
0
Figure 6. Load Regulation
ENABLE THRESHOLD VOLTAGE (V)
0
50
100
150
200
250
300
INPUT VOLTAGE (V)
OUTPUT LOAD CURRENT (mA)
Figure 7. Enable Threshold vs. Input Voltage
Figure 8. Ground Current vs. Load Current
http://onsemi.com
5
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
