Data Sheet
KA337 / LM337 — 3-Terminal 1.5 A Negative Adjustable Regulator
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA337 / LM337 Rev. 1.1.1 2
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at T
A
= 25°C unless otherwise noted.
Electrical Characteristics
V
I
- V
O
= 5 V, I
O
= 40 mA, 0°C ≤ T
J
≤ +125°C, P
DMAX
= 20 W; unless otherwise specified.
Notes:
1. Load and line regulation are specified at constant junction temperature. Change in V
O
due to heating effects must be
taken into account separately. Pulse testing with low duty is used.
2. C
ADJ
, when used, is connected between the adjustment pin and ground.
Symbol Parameter Value Unit
IV
I
- V
O
I Input-Output Voltage Differential 40 V
P
D
Power Dissipation Internally Limited W
R
θJC
Thermal Resistance, Junction to Case 4 °C/W
T
OPR
Operating Temperature Range 0 to +125 °C
T
STG
Storage Temperature Range -65 to +125 °C
Symbol Parameter Conditions Min. Typ. Max. Unit
R
line
Line Regulation
(1)
T
A
= +25°C,
3 V ≤ I V
I
- V
O
I ≤ 40 V
0.01 0.04
%/ V
3 V ≤ I V
I
- V
O
I ≤ 40 V 0.02 0.07
R
load
Load Regulation
(1)
T
A
= +25°C,
10 mA ≤ I
O
≤ 0.5 A
15 50
mV
10 mA ≤ I
O
≤ 1.5 A 15 150
I
ADJ
Adjustable Pin Current 50 100 μA
ΔI
ADJ
Adjustable Pin Current Change
T
A
= +25°C,
10 mA ≤ I
O
≤ 1.5 A,
3 V ≤ I V
I
- V
O
I ≤ 40 V
25μA
V
REF
Reference Voltage
T
A
=+25°C -1.213 -1.250 -1.287
V
3 V ≤ I V
I
- V
O
I ≤ 40 V,
10 mA ≤ I
O
≤ 1.5 A
-1.200 -1.250 -1.300
ST
T
Temperature Stability 0°C ≤ T
J
≤ +125°C 0.6 %
I
L(MIN)
Minimum Load Current to Maintain
Regulation
3 V ≤ I V
I
- V
O
I ≤ 40 V 2.5 10.0
mA
3 V ≤ I V
I
- V
O
I ≤ 10 V 1.5 6.0
e
N
RMS Noise, % of V
OUT
T
A
=+25°C,
10 Hz ≤ f ≤ 10 kHz
0.003 %
RR Ripple Rejection Ratio
V
O
= -10 V, f = 120 Hz 60
dB
C
ADJ
= 10 μF
(2)
66 77
ST Long-Term Stability T
J
= 125°C, 1000 Hours 0.3 1.0 %