Datasheet

INH/UVLO
VIN
AGND
R
UVLO
V
IN
LMZ30602
SNVS997 –JULY 2013 www.ti.com
Programmable Undervoltage Lockout (UVLO)
The LMZ30602 implements internal UVLO circuitry on the VIN pin. The device is disabled when the VIN pin
voltage falls below the internal VIN UVLO threshold. The internal VIN UVLO rising threshold is 3.135 V (max)
with a typical hysteresis of 300 mV.
If an application requires a higher UVLO threshold on the VIN pin, the UVLO pin can be configured as shown in
Figure 33. Table 8 lists standard values for R
UVLO
to adjust the VIN UVLO voltage up.
Figure 33. Adjustable VIN UVLO
Table 8. Standard Resistor values for Adjusting VIN UVLO
VIN UVLO (V) (typ) 3.25 3.5 3.75 4.0 4.25 4.5 4.75
R
UVLO
(kΩ) 294 133 86.6 63.4 49.9 42.2 35.7
Hysteresis (mV) 325 335 345 355 365 375 385
Thermal Shutdown
The internal thermal shutdown circuitry forces the device to stop switching if the junction temperature exceeds
175°C typically. The device reinitiates the power up sequence when the junction temperature drops below 160°C
typically.
EMI
The LMZ30602 is compliant with EN55022 Class B radiated emissions. Figure 34 and Figure 35 show typical
examples of radiated emissions plots for the LMZ30602 operating from 5V and 3.3V respectively. Both graphs
include the plots of the antenna in the horizontal and vertical positions.
Figure 34. Radiated Emissions 5-V Input, 1.8-V Figure 35. Radiated Emissions 3.3-V Input, 1.8-V
Output, 2-A Load (EN55022 Class B) Output, 2-A Load (EN55022 Class B)
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