DATASHEET
EL7531 FN7428
Rev 10.00
December 10, 2015 Monolithic 1A Step-Down Regulator with Low Quiescent Current
The EL7531 is a synchronous, integrated FET 1A step-down
regulator with internal compensation. It operates with an input
voltage range from 2.5V to 5.5V, which accommodates
supplies of 3.3V, 5V, or a Li-Ion battery source. The output can
be externally set from 0.8V to VIN with a resistive divider.
The EL7531 features automatic PFM/PWM mode control, or
PWM mode only. The PWM frequency is typically 1.4MHz
and can be synchronized up to 12MHz. The typical no load
quiescent current is only 120ВµA. Additional features include
a Power-Good output, 2.5V) forces the converter into PWM
mode in the next switching cycle regardless of output current.
The duration of the transition varies depending on the output
current. Figures 22 and 23 (under two different loading
conditions) show the device goes from PFM to PWM mode.
Note: In forced PWM mode, the IC will continue to start-up in
PFM mode to support pre-biased load applications. Start-Up and Shut-Down
When the EN pin is tied to VIN, and VIN reaches approximately
2.4V, the regulator begins to switch. The inductor current limit
is gradually increased to ensure proper soft-start operation. …
