CAT102 D

CAT102
Precision, Adjustable Shunt Regulator
(600 mV Reference)
FEATURES
DESCRIPTION
„ 600 mV low voltage reference
The CAT102 is a low-voltage reference and amplifier.
Designed for the control loop of low-voltage power
supplies, the reference voltage has been designed for
600 mV. Over a temperature from -40°C to 85°C, the
reference voltage is within 8 mV of the nominal
600mV. In addition, the error amplifier output and the
supply voltage pin (IN) are on separate pins.
„ ±6 mV initial accuracy
„ High PSRR: 45 dB at 300 kHz
„ Better line regulation: 1 mV (VIN from 2.2 V to 18 V)
„ Low supply current: 90 µA
„ Open drain output
Power supply rejection is a high 45 dB at 300 kHz.
The output, OUT, can sink 20 mA at a maximum
saturation voltage of 250 mV.
„ Directly drives optocouplers
„ Industrial temperature range of -40ºC to 85ºC
„ RoHS-compliant 5-lead TSOT23 package
When combined with an optocoupler, the CAT102 can
be used as an error amplifier that controls the
feedback loop in isolated low-output voltage switching
power supplies.
APPLICATION
„ SMPS control loop
„ Low temperature coefficient voltage reference
„ Power management
„ Replaces zener diodes
„ Isolated DC-to-DC converters
For Ordering Information details, see page 7.
„ Network, telecom and cellular base station
„ Adjustable voltage reference
PIN CONFIGURATION
FUNCTIONAL DIAGRAM
IN
FB
1
5
Error
Amplifier
TSOT-23 5L
Top View
OUT
3
+
VREF
600mV
FB
1 1
GND
2 2
OUT
4 3
5
8 IN
4
5 NC
–
+
–
PIN DESCRIPTION
Pin Name
FB
2
GND
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Function
Inverting input to error amplifier
GND
Ground
OUT
Output of error amplifier. Source & sink
current capability is 20 mA.
NC
No connection
IN
Positive supply
Doc. No. MD-4007 Rev. P
CAT102
ABSOLUTE MAXIMUM RATINGS
(1)
Parameters
Ratings
Units
VIN Voltage
20
V
OUT Voltage
20
V
FB Voltage
20
V
VIN, OUT, FB Current
50
mA
Operating Junction Temperature (10 seconds)
150
ºC
Lead Soldering Temperature (10 seconds)
260
ºC
-65 to +150
ºC
Storage Temperature Range
ELECTRICAL CHARACTERISTICS
Electrical characteristics are guaranteed over the full operating temperature range of -40°C to +85°C unless
otherwise specified. Ambient temperature must be de-rated based upon power dissipation and package thermal
characteristics.1 Unless otherwise stated, test conditions are VIN = 3 V, FB = OUT, IOUT = 1 mA.
Symbol
Parameter
VIN
Supply Voltage Range
IIN
Quiescent Supply Current
VFB
FB Threshold Reference Voltage
Line Regulation
Load Regulation
IFB
Conditions
Min
Typ
Max
Units
18
V
90
500
µA
600
606
2.2
VOUT =1 V
TJ = 25ºC
594
-40ºC < TJ < 85ºC
VIN = 2.2 V to VIN =18 V
VOUT = 0.6 V
IOUT = 1 mA to 10 mA
VOUT = 0.6 V
592
608
mV
0.5
1
mV
3
8
mV
500
nA
FB Input Current
Reference Power Supply
Rejection
Error Amplifier Open Loop Gain
Frequency = 300 kHz
35
65
dB
IOUT = 2 mA, VOUT = 1 V
60
80
dB
Unity Gain Frequency
IOUT = 2 mA, VOUT = 1 V
1
2
MHz
Output Saturation voltage
IOUT = 20 mA, VFB = HIGH
130
Output Transconductance
IOUT = 1 mA to 20 mA
2.5
ILEAK
Output Leakage Current
VOUT = 16 V, VFB = 0
0.5
IOUT(MAX)
Maximum Output Current
VOUT = 0.3 V
PSRR (3)
AV
BW
(3)
VOUT
TRANSC
(3)
-500
20
250
mV
mA/mV
2
µA
mA
Notes:
(1)
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolongued time periods
may affect device reliability. All voltages are with respect to ground.
(2) Thermal Characteristics (ΘJA) of TSOT-23 5-lead: 255°C/W
(3) This parameter is controlled by design and verified during product evaluation. It is not production tested.
Doc. No. MD-4007 Rev. P
2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT102
TYPICAL PERFORMANCE CHARACTERISTICS
Line Regulation (at 1mA)
Load Regulation
6
0.35
Output Voltage Change (mV)
Output Voltage Change (mV)
0.4
0.3
0.25
0.2
0.15
0.1
0.05
0
2
6
10
14
5
4
3
2
1
0
18
1
5
Supply Voltage (V)
20
Power-Supply Rejection Ratio vs. Frequency
-50
92
-55
90
-60
88
PSRR (dB)
Supply Current (µA)
15
Load Current (mA)
Supply current vs. Input Voltage
86
84
-65
-70
-75
-80
-85
82
-90
80
-95
-100
0.1
78
0
5
10
15
20
1
10
1000
10000 100000
Gain vs. Frequency
Reference Voltage
620
90
610
70
Gain (dB)
630
110
600
590
50
30
10
580
570
-40
100
F r e q u e n c y (H z )
Input Voltage (V)
Reference Voltage (mV)
10
-10
0
40
80
0.01
120
1
10
100
1000
10000
Frequency (kHz)
Junction Temperature (ºC)
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
0.1
3
Doc. No. MD-4007 Rev. P
CAT102
APPLICATIONS INFORMATION
The CAT102 adjustable shunt regulator features
isolated supply inputs and outputs, ideal for isolated
power-supply applications using an optocoupler in
the feedback path. The CAT102 sinks 20 mA with
VOUT at 0.3 V. The wide input supply range allows
the device to operate from 2.2 V to 18 V. The
CAT102 compares the FB input to a precision
600mV reference. If the FB input is low, the OUT pin
sinks no current. If FB rises above 600 mV, the OUT
pin sinks up to 20 mA.
The current limit can be adjusted by using a resistor R3
connected between the IN and OUT pins. For example,
a 3.3 V supply VIN is associated with R3 = 135 Ω, and a
10 V supply works best with R3 = 470 Ω. The CAT102
shunt regulator is limited to low-current applications with
the OUT pin capable of sinking up to 20 mA max.
Figure 1 shows the CAT102 configured as a shunt
regulator. To generate an output voltage of 0.6 V,
the FB pin has to be directly connected to the OUT
pin. A 1.0 µF capacitor from OUT to GND is
recommended when the output voltage is 0.6 V. A
resistor-divider connected from OUT to GND is used
to produce a higher output voltage as set by the
following equation:
VOUT = (1 + R1/R2) x 0.6 V
Figure 1. Application circuits for 0.6 V output and 1.2 V output voltages
R3
VIN
VOUT
3.3V
0.6V/20mA
5
OUT
IN
3
C2
C1
0.1µF
CAT102
2
GND
FB
1µF
1
R3
VIN
VOUT = (1 + R1/R2) x 0.6V
3.3V
1.2V/20mA
5
OUT
IN
3
C1
0.1µF
CAT102
2
GND
FB
1
R1
C2
10kΩ
1µF
R2
10kΩ
Doc. No. MD-4007 Rev. P
4
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT102
TYPICAL APPLICATION
VIN
VOUT
Regulator
with
Isolation
1V regulated
output
Opto-isolator
VCC > 2.2V
R3
100Ω
5
OUT
IN
3
C1
0.1µF
R4
100kΩ
R1
22kΩ
C2
CAT102
2
GND
FB
1
1µF
R2
33kΩ
Figure 2. Opto-Feedback Application Circuit
In order to allow proper operation of the optocoupler and the CAT102, the supply voltage VCC must be greater
than 2.2 V.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-4007 Rev. P
CAT102
PACKAGE OUTLINE DRAWING
TSOT-23 5-Lead (TD)
(1)
SYMBOL
D
MIN
NOM
A
e
E1
E
MAX
1.00
A1
0.01
0.05
0.10
A2
0.80
0.87
0.90
b
0.30
c
0.12
0.45
0.15
D
2.90 BSC
E
2.80 BSC
E1
1.60 BSC
e
0.20
0.95 TYP
L
0.30
0.40
L1
0.60 REF
L2
0.25 BSC
θ
0º
0.50
8º
TOP VIEW
A2 A
b
θ
L
A1
c
L2
L1
SIDE VIEW
END VIEW
Notes:
(1) All dimensions in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-193.
Doc. No. MD-4007 Rev. P
6
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT102
EXAMPLE OF ORDERING INFORMATION
Prefix
Device # Suffix
CAT
102
Company ID
TD
1
I
-
Package
TD: TSOT-23
Product Number
102
G
Lead Finish
G: NiPdAu (PPF)
T3
Tape & Reel
T: Tape & Reel
3: 3,000/Reel
Temperature Range
I = Industrial (-40°C to 85°C)
ORDERING PART NUMBER
CAT102TDI-G
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free)
(2) The device used in the above example is a CAT102TDI-GT3 (TSOT-23, Industrial Temperature, NiPdAu, Tape & Reel, 3,000/Reel)
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-4007 Rev. P
CAT102
REVISION HISTORY
Date
Rev.
Description
29-Jan-07
M
Added Ordering Information
16-Jun-07
N
Changed package from SOT-23 to TSOT-23
Updated Features
Updated Functional Diagram
Updated Electrical Characteristics
Updated Typical Performance Characteristics
Changed termination from SnPb to NiPdAu
Added MD- to document Number
19-Nov-08
O
Change logo and fine print to ON Semiconductor
05-Feb-09
P
Updated Electrical Characteristics Table
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to
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arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights
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PUBLICATION ORDERING INFORMATION
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Doc. No. MD-4007 Rev. P
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© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
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