CAT431LEZR-TEAP [CATALYST]
Low-Voltage Adjustable Precision Voltage Reference; 低电压可调节精密基准电压源
| 型号： | CAT431LEZR-TEAP |
| 厂家： | 
CATALYST SEMICONDUCTOR |
| 描述： | Low-Voltage Adjustable Precision Voltage Reference |
| 文件： | 总11页 (文件大小：148K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT431L
Low-Voltage Adjustable Precision Voltage Reference
- 0.5% Tolerance
- SOT23 and TO92 Packages
- Low Startup Overshoot
FEATURES
■ Low startup overshoot
■ Low dynamic impedance: 0.3Ω at 1kHz
■ Compact 3-lead SOT23 package option
■ Industrial temperature range: -40°C to 85°C
■ Adjustable output voltage: VREF to 6V
■ Wide current operation: 40µA to 100mA
■ Low temperature coefficient reference: +12mV
max deviation over temperature
■ Accurate 1.24V reference voltage: +0.5%
(+6mV) at 25°C
APPLICATIONS
■ SMPS control loop
■ Current limiting
■ Shunt regulator
■ Over/Under voltage monitor
■ 3V Off-line switching regulators
■ Low temperature coefficient voltage reference
DESCRIPTION
Minimal overshoot at startup and wide AC bandwidth
make the CAT431L easy to apply in a wide set of
applications. When used with an opto-coupler, the
CAT431L is an ideal voltage reference in isolated
feedback circuits for 3V to 3.3V switch-mode power
supplies.
The CAT431L is a low-voltage three-terminal
adjustable shunt voltage reference with guaranteed
thermal stability over the industrial temperature range.
The CAT431L has a lower 1.24V reference and wider
operating current range than the widely used TL431
and TL431A shunt-regulator references. Compared
to the TLV431/A, the CAT431L 1.24V reference is two
times more accurate.
FUNCTIONAL DIAGRAM
CATHODE
CATHODE
+
REF
–
REF
V
1.24
REF
ANODE
ANODE
© 2003 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 4006, Rev. J
1
CAT431L
PIN CONFIGURATION
SOT-23
TOP VIEW
SOT-23-5
TOP VIEW
TO-92
TOP VIEW
2
1
CATH
REF
1
2
3
5
4
NC
NC
ANODE
REF
CATH
ANODE
3
ANODE
REF
CATH
PIN DESCRIPTIONS
Pin Name
Function
Output and supply terminal, must be greater than 1.24V for normal
operation
CATH
REF
Input, nominally 1.24V in normal operation
Ground and Substrate
ANODE
ORDERING INFORMATION
Part Number
Package
Ambient Temperature Range
-40° C to 85° C
CAT431LEUR-TE7
CAT431LEUK-TE7
CAT431LEZR-TEAP
3-Pin, SOT-23
5-Pin, SOT-23
3-Pin, TO-92
-40° C to 85° C
-40° C to 85° C
TE7 = 7" Reel, 3,000 parts per reel
TEAP = Ammopack, 3,000 parts per reel
Doc. No. 4006, Rev. J
2
CAT431L
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation is not
Cathode Voltage .................................................. 18V
REF Current ........................................................ 3mA
Cathode, Anode Currents ............................... 150mA
Operating Junction Temperature ..................... 150°C
Lead Soldering Temperature (10 sec)............. 260°C
Storage Temperature Range ...........-65°C to +150°C
implied. Exposure to absolute maximum ratings for prolongued
time periods may affect device reliability. All voltages are with
respect to ground.
ELECTRICAL CHARACTERISTICS
Electrical characteristics are guaranteed over the full operating temperature range of -40°C to +85°C with a junction
temperature from -40°C to +105°C unless otherwise specified. Ambient temperature must be de-rated based upon
power dissipation and package thermal characteristics.1
Symbol Parameter
Conditions
VREF=VCATH
ICATH=10mA
Min
Typ
1.240
1.240
4
Max
1.246
1.252
12
Units
V
Reference Voltage
25° C
1.234
1.228
VREF
TEMP
V
∆VREF
VREF Temperature deviation
mV
∆VREF
∆VCATH
Ratio of VREF Change to VCATH
Change (Line Reg; 1/gain)
ICATH=10mA
VCATH=VREF to 6V
0.3
1
mV/V
IREF
Reference input current
ICATH=10mA
0.2
0.04
18
0.4
0.2
40
µA
µA
µA
nA
∆IREF
IREF Temperature Deviation
ICATH(min) Minimum Cathode Current
ICATH(OFF) Off-State Cathode Current
VREF=0V; VCATH=16V
100
ICATH=0.1 to 100mA
f=1.0kHz
Ω
rCATH
Dynamic Output Impedance
0.3
0.4
1. Thermal Characteristics (Θ
3-lead, SOT-23: 336°C/W
5-lead, SOT-23: 255
)
JA
3-pin, TO-92: 155
Recommended Operating Conditions
Parameter
Min
VREF
0.1
Max
Units
Cathode Voltage
6
V
Cathode Current
15
85
mA
°
Operating Ambient Temperature
-40
C
Doc. No. 4006, Rev. J
3
CAT431L
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage
vs.
Junction Temperature
Reference Input Current
vs.
Junction Temperature
1.246
1.244
1.242
1.240
1.238
1.236
1.234
1.232
250
240
230
220
210
200
190
180
170
160
150
-50 -25
0
25 50 75 100 125 150
-50 -25
0
25 50 75 100 125 150
Junction Temperature (°C)
Junction Temperature (°C)
Cathode Current
vs.
Cathode Voltage
Cathode Current
vs.
Cathode Voltage
150
100
50
50
40
30
20
10
0
0
-50
-100
-10
-1
-0.5
0
0.5
1
1.5
-1
0.5
1
1.5
Cathode Voltage (V)
Cathode Voltage (V)
Doc. No. 4006, Rev. J
4
CAT431L
TYPICAL PERFORMANCE CHARACTERISTICS
Off-State Cathode Current
vs.
Junction Temperature
Delta Reference Voltage Per
Delta Cathode Voltage vs.
Junction Temperature
80
70
60
50
40
30
20
10
0
0
-0.02
-0.04
-0.06
-0.08
-0.10
-0.12
-0.14
-0.16
-0.18
-50 -25
0
25 50 75 100 125 150
-50 -25
0
25 50 75 100 125 150
Junction Temperature (°C)
Junction Temperature (°C)
Open Loop Voltage Gain
vs.
Frequency
Dynamic Impedance
vs.
Frequency
100
80
60
40
20
0
100
10
1
-20
0.1
0.001 0.01
0.1
1
10
100
1000
0.1
1
10
100
1000
10000
Frequency (kHz)
Frequency (kHz)
Doc. No. 4006, Rev. J
5
CAT431L
Doc. No. 4006, Rev. J
6
CAT431L
TYPICAL APPLICATIONS
Shunt Voltage Regulator
V
o
R1
0.1%
(
R1
R2
V = 1 +
V
REF
o
V
CAT431L
(
REF
R2
0.1%
Flyback Converter with Optical Isolation
V
120V
I
-
+
~
V
o
3.3V
Gate Drive
V
CC
Controller
V
FB
GND
Current
CAT431L
Sense
Doc. No. 4006, Rev. J
7
CAT431L
PACKAGE OUTLINES
3 LEAD SOT-23
b
PIN #3
PIN #1
PIN #2
e
e1
D
(4X)
L1
L
NOTES:
1. ALL DIMENSIONS ARE IN INCHES & IN [ ] ARE IN MM.
2. PACKAGE OUTLINE DIMENSIONS INCLUSIVE OF METAL BURRS.
3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.076MM. [0.003"].
4. ALL PACKAGE SURFACES TO BE MIRROR FINISH.
5. MOLDING AND FORMING WITH DIE FACING UP.
6. LEADFINISH PLATING: 0.00762MM [0.0003"] - 0.0254MM [0.001"].
PACKAGE OUTLINE EXCLUSIVE OF LEADFINISH PLATING.
7. THIS POD COMPLIES TO JEDEC TO-236AB ISSUE H.
Doc. No. 4006, Rev. J
8
CAT431L
5 LEAD SOT-23
1.900
0.950
PIN #4
PIN #5
PIN #1
+0.150
0.350
-0.000
PIN #3
+0.050
1.600
-0.150
TOP PACKAGE
2.900+0.100
DATUM "A"
0.575
+0.150
0.400
-0.050
NOTES:
1. ALL DIMENSIONS ARE IN MM.
2. PACKAGE OUTLINE DIMENSIONS INCLUSIVE OF METAL BURR.
3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.076MM.
4. ALL PACKAGE SURFACE TO BE MIRROR FINISH.
5. MOLDING WITH DIE FACING UP, AND FORMING WITH DIE FACING DOWN.
6. FOOT LENGTH TO BE MEASURED AT THE INTERCEPT POINT OF EXTERNAL LEADS AND DATUM "A".
7. LEADFINISH PLATING: 0.00762MM - 0.0254MM. PACKAGE OUTLINE EXCLUSIVE OF LEADFINISH PLATING.
Doc. No. 4006, Rev. J
9
CAT431L
3 LEAD TO92
Branding surface
0.53 max. (TRIM)
0.405 +/- 0.045
0.458 min
0.505 max
3.55 +/- 0.15
R = 0.1 max
2.04 - 2.66
0.38
(for lead tip only)
Round lead corners (R = 0.2)
NOTE : 1.0 All dimensions are in mm.
2.0 Dimension tolerance of 0.05 mm unless
otherwise specified.
3.0 Solder dipping finish @ 63/37 Sn/Pb.
4.0 Burrs in trim @ 0.13 mm max.
Doc. No. 4006, Rev. J
10
REVISION HISTORY
Date
Rev.
Reason
12/15/03
J
Updated typical performance characteristics
legend for Delta Reference voltage
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Publication #: 4006
Revison:
Issue date:
Type:
J
12/15/03
Final
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