The LM4132 family of precision voltage references performs comparable to the best
laser-trimmed bipolar references, but in cost-effective CMOS technology. The key to this
breakthrough is the use of EEPROM registers for correction of curvature, temperature coefficient
(tempco), and accuracy on a CMOS band-gap architecture allowing package-level programming to
overcome assembly shift. The shifts in voltage accuracy and tempco during assembly of die into
plastic packages limit the accuracy of references trimmed with laser techniques.
Unlike other LDO references, the LM4132 can deliver up to 20 mA and does not require an
output capacitor or buffer amplifier. These advantages along with the SOT-23 packaging are
important for space-critical applications.
Series references provide lower power consumption than shunt references, because they do
not have to idle the maximum possible load current under no-load conditions. This advantage, the
low quiescent current (60 µA), and the low dropout voltage (400 mV) make the LM4132 ideal for
The LM4132 is available in five grades (A, B, C, D and E) for greater flexibility. The
best grade devices (A) have an initial accuracy of 0.05% with a specified temperature coefficient
of 10 ppm/°C or less, while the lowest grade devices (E) have an initial accuracy of 0.5% and a
tempco of 30 ppm/°C.