BAYLI B431LAM, B431LAK3, B431LCZ, B431LCM, B431LCK3 Datasheet
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Bay Linear
Bay Linear
Bay LinearBay Linear
Inspire the Linear Power
Inspire the Linear Power
Inspire the Linear PowerInspire the Linear Power
1.24V Adjustable Shunt Regulator
B431L
Description
The B431L is a three terminal adjustable shunt regulator with
thermal stability of 50ppm/°C. The output voltage can be
adjusted to any value from 1.24V (V
external resistors. These devices have a typical output
impedance of 0.05Ω. Active output circuitry provides a very
sharp turn-on characteristics and making the device excellent
replacement for zener diodes in many applications. The B431L
is an ideal voltage reference in an isolated feedback circuit for
3.0V switch mode power supplies
The B431L shunt regulator is available with three voltage
tolerances (0.5%, 1.0% and 2.0%) and three package options
(SOT-23-3, TO-92, 8SOIC). This allows the designer the
opportunity to select the optimum combination of cost and
performance for their application.
) to 16V with two
REF
Features
• Low voltage operation (down to 1.24V)
• Wide operating current……80µA to 100mA
• Trimmed bandgap design………….. ± 0.5%
• Low Dynamic Output Impedance…....0.05ΩΩΩΩ
• Wide temperature range…... -40°°°°C to +85°°°°C
Available in ….….SOT-23-3, TO-92 , 8SOIC
•
Pin-to-Pin Replacement …………….SC431L
•
Applications
• Switching Power Supplies
• Adjustable Power Supplies
• Linear Regulators
• Battery Powered Equipment
• Monitors, TV, VCR
• Instrumentation
Pin Connection
Ordering Information
Package Tolerance
0.5% 1% 2%
TO-92 B431LAZ B431LBZ B431LCZ
SO-8 B431LAM B431LBM B431LCM
SOT-23 B431LAK3 B431LBK3 B431LCK3
TO-92 (Z)
TO-92 (Z)
2
2
13
13
SOT-23-3 (K3)
SOT-23-3 (K3)
Anode
Anode
BAY
BAY
Ref
Ref
Bay Linear, Inc
Anode
Anode
Bottom View
Bottom View
Cathode
Cathode
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
Ref
Ref
Top View
Top View
Cathode
Cathode
B431L
Absolute Maximum Rating
Parameter Symbol Maximum Units
Cathode Voltage Vz 20 V
Continuous Cathode Current Iz 100 mA
Reference Input Current Range 3 mA
Power Dissipation at TA - 25°C
SOT-23-3
S0-8
TO-92
Thermal Resistance
SOT-23-3
S0-8
TO-92
P
D
O
JA
0.37
0.75
0.95
336
175
132
Operating Junction Temperature Range TJ -40 to +150
Storage Temperature Range T
Lead Temperature (Soldering) 10 seconds T
ESD Rating (Human Body Model) T
Recommended Operating Con ditions
-65 to +150
STG
300
LEAD
2 kV
ESD
W
°
C/W
°
°
°
C
C
C
Min Max Symbol
Cathode Voltage, Vz V
Cathode Current, Iz 80µA 100 mA
16 V
REF
Electrical Characteristics
Unless specified: T
. Values in bold apply over full operating ambient temperature.
٨ = 25°C
Parameter Symbol Condition Min Typ Max Units
V
Temp Deviation V
REF
V
REF
V
DEV
Z
Z
= V
= V
REF1 IZ
REF1, IZ
= 10mA
= 10mA
IA=full range
Ratio of Change in
V
To Change in V
REF
Reference Input
Current
I
Temperature
REF
Deviation
Off-State Cathode
Current
Z
Δ V
ΔVZ
I
REF
I
REF(DEV)
I
Z (OFF)
REF
= 10mA,ΔV
I
Z
= 16V to V
Z
(2)
R1 = 10kΩ, R2 = ∞,
I
= 10mA
Z
R1 = 10kΩ, R2 = ∞,
I
= 10mA
Z
V
= 0V, VZ =16V
REF
V
= 0V, VZ =16V
REF
Min Operating
I
V
Z(MIN)
= V
Z
REF
Current
Dynamic Impedance Z
KA
I
=100µA to 100mA, f≤1kHA
K
VKA=V
ref
(1)
1.234 1.246 Reference Voltage V
1.222
(1)
Ref
(2)
(2)
(3)
(3)
(1)
20 80 µA
,
10 25 mV
-2.7 -1.0 mV/V
0.15 0.5
0.1 0.4
0.125 0.150
0.135 0.150
0.05 0.15
B431LA 0.5%
1.240
1.258
V
µ
A
µ
A
µA
Ω
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
B431L
Electrical Characteristics
Unless specified: T
. Values in bold apply over full operating ambient temperature.
٨ = 25°C
Parameter Symbol Condition Min Typ Max Units
V
Temp Deviation V
REF
V
REF
V
DEV
Z
Z
= V
= V
REF1 IZ
REF1, IZ
= 10mA
= 10mA
IA=full range
Ratio of Change in
V
To Change in V
REF
Reference Input
Current
I
Temperature
REF
Deviation
Off-State Cathode
Current
Z
Δ V
ΔVZ
I
REF
I
REF(DEV)
I
Z (OFF)
REF
= 10mA,ΔV
I
Z
= 16V to V
Z
(2)
R1 = 10kΩ, R2 = ∞,
I
= 10mA
Z
R1 = 10kΩ, R2 = ∞,
I
= 10mA
Z
V
= 0V, VZ =16V
REF
V
= 0V, VZ =16V
REF
Min Operating
I
V
Z(MIN)
= V
Z
REF
Current
Dynamic Impedance Z
KA
I
=100µA to 100mA, f≤1kHA
K
VKA=V
ref
(1)
1.228 1.252 Reference Voltage V
1.215
(1)
Ref
(2)
(2)
(3)
(3)
(1)
20 80 µA
,
10 25 mV
-1.0 -2.7 mV/V
0.15 0.5
0.1 0.4
0.125 0.150
0.135 0.150
0.05 0.15
B431LB 1%
1.240
1.265
V
µ
A
µ
A
µA
Ω
Electrical Characteristics
Unless specified: T
. Values in bold apply over full operating ambient temperature.
٨ = 25°C
Parameter Symbol Condition Min Typ Max Units
V
Temp Deviation V
REF
V
REF
V
DEV
Z
Z
= V
= V
REF1 IZ
REF1, IZ
= 10mA
= 10mA
IA=full range
Ratio of Change in
V
To Change in V
REF
Reference Input
Current
I
Temperature
REF
Deviation
Off-State Cathode
Current
Z
Δ V
ΔVZ
I
REF
I
REF(DEV)
I
Z (OFF)
REF
= 10mA,ΔV
I
Z
= 16V to V
Z
(2)
R1 = 10kΩ, R2 = ∞,
I
= 10mA
Z
R1 = 10kΩ, R2 = ∞,
I
= 10mA
Z
V
= 0V, VZ =16V
REF
V
= 0V, VZ =16V
REF
Min Operating
I
V
Z(MIN)
= V
Z
REF
Current
Dynamic Impedance Z
KA
I
=100µA to 100mA, f≤1kHA
K
VKA=V
ref
(1)
1.215 1.265 Reference Voltage V
1.200
(1)
Ref
(2)
(2)
(3)
(3)
(1)
20 80 µA
,
10 35 mV
-1.0 -2.7 mV/V
0.15 0.5
0.1 0.4
0.125 0.150
0.135 0.150
0.05 0.15
B431LC 2%
1.240
1.280
V
µ
A
µ
A
µA
Ω
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com
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