1.25VPrecision Adjustable
Shunt Reference / Amplifier
Preliminary Product Information
CL432
FEATURES
•• Tem p erat ure-Com p ensated: 50 p pm/oC
•• Trimmed 0.5% Bandgap Reference
•• Int er nal Ampl ifi er w ith 1 50mA C apabili ty
•• Nomi nal Temper atur e Range Extended to 10 5oC
•• Lo w Freq uenc y Dynamic O utput Imp edan ce: < 150m
•• Low Output Noise
DESCRIPTION
Calogic’s CL432 is a 3-terminal Adjustable Shunt Regulator
highly accurate 1.25V bandgap reference with a 0.5%
tolerance. The device offers thermal stability, wide operating
current (100mA) and an extended temperature range of 0o to
105oC for operation in power supply applications. The CL432
offers a wide opera ting voltage range of up to 18V and is an
excellent choice for voltage reference requirements in an
isolated feedback circuit for 3.0V to 3.3V switching mode
power supplies. The tight tolerance guarantees a lower
design cost for the power supply manufacturer by virtually
eliminating the need for an extra power supply manufacturing
proce ss of the power supply.
The devic e is housed in several package options to meet the
desig ner s crite ria.
ORDERING INFORMATION
Part Package Temperature Range
CL432LP TO-92 0 to 1 05oC
CL432D 8-Pin Plastic SOIC 0 to 1 0 5oC
CL432VS SOT-23 0 to 105oC
CL432S SO T - 89 0 to 1 05oC
CORPORATION
CAL OG IC CO RPO RATION, 237 Whitney Place, Fremont, Cal ifornia 94539, Telephone: 510-656-2900, FA X: 510-651-3025
CATHODE
ANODE
REFERENCE
TO-92 (LP)
1G-33
SOIC (D)
8
7
6
5
1
2
3
4
REFERENCE
ANODE
ANODE
N/C
CATHODE
ANODE
ANODE
N/C
1G-34
1G-35
CATHODE
ANODE
REFERENCE
SOT-89 (S)
PIN CONFIGUR ATION (Top View)
1J-22
CATHODE
REFERENCE
SOT-23 (VS)
ANODE
CL432
CORPORATION
ABSOLUTE M AXIM UM R A T INGS
SYMBOL PARAMETER RATING UNITS
VKA Cathode-Anode Reverse Breakdown 18 V
IAK Anode-Cathode Forward Current 1 A
IKA Operating Cathode Current 100 mA
IREF Re fere nce Inp ut Current 1 mA
PDCo ntinu ou s Power at 25oC
TO-92
8L SOIC
SOT-23
SOT-89
775
750
1000
200
mW
mW
mW
mW
TJJunction Temperature 150 oC
TSTG Storage Te mperature –65 to 150 oC
TLLead Temperature, Soldering 10 Seconds 300 oC
Stre sses g reater tha n those li sted unde r ABSOLUTE MAXIMUM RATINGS ma y cause pe rmane nt dam age to t he device. This is a stress r ating
only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification
is n ot im pli ed. Expo su re to abso lut e m a ximu m rati ng conditi on s for ext ende d peri od s m a y a ffe ct reliab ili ty.
RECOM MENDED CONDIT IONS
SYMBOL PARAMETER RATING UNIT
VKA Cathode Voltage VREF to 18 V
IKCathode Current 10 mA
TYPICAL THERMAL RESISTANCES
PACKAGE θJA θJC TYPICAL DERATING
TO-92 160oC/W 80oC/W 6.3mW/oC
SOIC 175oC/W 45oC/W 5.7mW/oC
SOT-23 575oC/W 150oC/W 1.7mW/oC
SOT-89 110oC/W 8oC/W 9.1mW/oC
CAL OG IC CO RPO RATION, 237 Whitney Place, Fremont, Cal ifornia 94539, Telephone: 510-656-2900, FA X: 510-651-3025
1J-23
ANODE (A)
CATHODE (K)
1.25V
REFERENCE (R) +
–
+
–
FUNCTIONAL BLOCK DIAGRAM
CL432
CORPORATION
CAL OG IC CO RPO RATION, 237 Whitney Place, Fremont, Cal ifornia 94539, Telephone: 510-656-2900, FA X: 510-651-3025
ELECTRICA L CHARACTERI STICS
Ele ctr ical characteri stics are gua ran te ed over ful l ju nctio n tem perature rang e (0 to 1 05 oC). Ambient temperature must be derated based on
power dissipation and pack age thermal characteristics. The conditions are: VKA = VREF and IK = 1 0m A unless o therwise stated .
SYMBOL PARAMETER MIN TYP MAX UNIT TEST CONDITION
VREF Output Voltage 1.244 1.250 1.256 V IK = 10mA, TJ = 25oC, VK = VREF
VREF Line Regulation 10 15 mV VK = 1.25 to 15V
VREF Load Regulation 3 6 mV IK = 1 to 100mA
VREF Temperature Deviation 2 6 mV 0 < TJ < 105oC
IREF Reference Input Current 3 6 µA
I REF Reference Input Current Temperature
Coefficient 0.3 0.6 µA 0 < TJ < 105oC
IK(MIN) Min. Cathode Current for Regulation 0.6 1 mA
IK(MIN) Off State Leakage 0.04 500 nA VREF = 0V, VKA = 18V
*Te mperatu re devia tio n i s d ef ined as the ma ximu m devia tio n of the refere nce over the given tem pe rat ure range a nd do es not im ply an
incremental deviation at any given temperature.
TYPICAL PERFO RM ANCE CU RVES (Not available at time of p ublishing)
Cal ogic reserves the right to make changes wi thout further notice to any products descri bed herein to improve reliability, function,
or design. C alogic does not assume any liability arising out of the application or use of any product or circuit described herein;
neither does it convey any license under its patent rights or the right of others. Calogic products are not authorized for use as
components in life support devices or systems intended for surgical implant into the body or intended to support or sustain life.
Buyer agrees to notify Calogic of any such intended end use whereupon Calogic will determine availability and suitability of its
produ cts for the int end ed use. Calogic a nd the Calogic logo are tr adem arks of Calogic.
CL432
CORPORATION
Inf orm at i on furni shed by Calogic is b elieved to be accurate and reliable. Howe ver, n o responsibi lit y i s assum ed for its use: no r for any infring eme nt of pate nts or o ther
rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Calogic.
CAL O GIC CORPOR ATION, 237 Whitney Place, Fremont, Cal iforni a 94539, Telephone: 510 -656-2900, FAX : 510-651-3025
CL432
CORPORATION
TYPICAL PERFO RM ANCE CU RV ES
CAL OG IC CO RPO RATION, 237 Whitney Place, Fremont, Cal ifornia 94539, Telephone: 510-656-2900, FA X: 510-651-3025
100
0.01
–60
1G-43
OFF STATE LEAKAGE
–30 0 306090120
10
1
0.1
CURRENT (nA)
VKA = 36V
VREF = 0V
– AMBIENT TEMPERATURE (˚C)TA
– OFF STATE CATHODEIZoff
150
–100
–2 3
1G-42
HIGH CURRENT OPERATING
CHARACTERISTICS
75
50
25
0
–25
–50
–75
125
100
210–1
– CATHODE VOLTAGE (V)VKA
TEMPERATURE RANGE: –55 to 125˚C
VKA = VREF
– CATHODE CURRENT (mA)
IK
2.54
2.46
–60
1G-44
TEMPERAT URE COEFFICIENT AS
A FUNCTION OF TRIM VALUE
–30
2.47
2.48
2.49
2.50
2.51
2.52
2.53
0
30 60 90 120
V
REF
– REFERENCE VOLTAGE (V)
– AMBIENT TEMPERATURET
A
V
KA
= V
REF
I
K
= 10mA
V
REF
= 2.503V AT 25˚C
VKA – CATHODE VOLTAGE (V)
– CATHODE CURRENT (µA)
IK
900
–200
–1.0 3.0
1G-41
LOW CURRENT OPERATING
CHARACTERISTICS
1.00 2.0
–100
800
700
600
500
400
300
200
100
0
125˚C
–55˚C
25˚C
V= V
REFKA
TEMPERATURE RANGE: –55 to 125˚C
0
–50030
1G-46
REFERENCE VOLTAGE
LINE REGULATION
3 6 9 12 15 18 21 24 27
–10
–20
–30
–40
VOLTAGE (mV)
– CHANGE IN REFERENCEVREF
– CATHODE VOLTAGE (V)VKA
IK= 10mA
TEMPERATURE RANGE: –55 to 125˚C
–55˚C
0˚C
25˚C
75˚C
125˚C
3.0
0
–60
1G-45
REFERENCE
INPUT CURRENT
–30 0 306090120
2.5
2.0
1.5
1.0
0.5
CURRENT (µA)
– REFERENCE INPUTIREF
TA– AMBIENT TEMPERATURE (˚C)
R1 = 10kΩ
R2 = ∞
IK= 10mA
CL432
CORPORATION
CAL OG IC CO RPO RATION, 237 Whitney Place, Fremont, Cal ifornia 94539, Telephone: 510-656-2900, FA X: 510-651-3025
TYPICAL PERFO RM ANCE CU RVES (continued)
70
010
1G-47
NOISE VOLTAGE
100k
f – FREQUENCY (Hz)
60
50
40
30
20
10
10k1k100
NOISE VOLTAGE nV/ Hz
VKA = VREF
= 10mA
TA= 25˚C
IK
0.150
0.0
–60
1G-48
LOW FREQUENCY DYNAMIC
OUTPUT IMPEDANCE
–30 0 306090120
0.125
0.100
0.075
0.050
0.025
– DYNAMIC IMPEDANCE (Ω)
ZKA
VKA = VREF
= 1 TO 100mA
f ≤ 1kHz
IKA
– FREE AIR TEMPERATURETA
100
0.011k
1G-49
DYNAMIC OUTPUT
IMPEDANCE
10M
f – FREQUENCY (Hz)
1M100k10k
10
1.0
0.1
– DYNAMIC IMPEDANCE (Ω)
ZKA
TA= 25˚C
= 1 TO 100mAIK
70
01k
1G-50
SMALL SIGNAL G AIN
vs FREQUENCY
10M
f – FREQUENCY (Hz)
60
50
40
30
20
10
1M
100k10k
I
K
= 10mA
GAIN (dB)
– SMALL SIGNAL VOLTAGE
A
V
T
A
= 25˚C
1H-01
K
I230Ω
GND
OUT
15k
8.25k
9µF
CL432
CORPORATION
100
010 10
1H-04
7
STABILITY BOUNDARY
CONDITIONS
90
80
70
60
50
40
30
20
10
101010101010 6543210
TA= 25˚C
A
C
D
– CATHODE CURRENT (mA)
IK
B
A: V
KA
= V
REF
B: VKA = 5V AT I
K
= 10mA
C: VKA = 10V AT IK= 10mA
D: VKA = 15V AT IK= 10mA
STABILITY
REGION
– LOAD CAPACITANCE (pF)CL
6
–10
1H-02
PULSE RESPONSE
t – TIME (µs)
INPUT AND OUTPUT VOLTAGES (V)
121234567891011
4
3
2
1
0
5INPUT
OUTPUT
1H-03
GND
OUT
220
Ω
INPUT
MONITOR
50Ω
f
P
= 100 kH z
1H-05
K
I
L
C
150Ω
10k
TYPICAL PERFO RM ANCE CU RVES (continued)
CAL OG IC CO RPO RATION, 237 Whitney Place, Fremont, Cal ifornia 94539, Telephone: 510-656-2900, FA X: 510-651-3025
