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CS5111
1.4A Switching Regulator with 5V, 100mA Linear Regulator with Watchdog, RESET and ENABLE
CS5111
1.4 A Switching Regulator
with 5.0 V , 100 mA Linear
Regulator with Watchdog,
RESET and ENABLE
The CS5111 is a dual output power supply integrated circuit. It
contains a 5.0 V ± 2%, 100 mA linear regulator, a watchdog timer, a
linear output voltage monitor to provide a Power On Reset (POR) and
a 1.4 A current mode PWM switching regulator.
The 5.0 V linear regulator is comprised of an error amplifier, reference,
and supervisory functions. It has low internal supply current consumption
and provides 1.2 V (typical) dropout voltage at maximum load current.
The watchdog timer circuitry monitors an input signal (WDI) from
the microprocessor. It responds to the falling edge of this watchdog
signal. If a correct watchdog signal is not received within the
externally programmable time, a reset signal is issued.
The externally programmable active reset circuit operates correctly
for an output voltage (VLIN) as low as 1.0 V . During power up, or if the
output voltage shifts below the regulation limit, RESET toggles low
and remains low for the duration of the delay after proper output
voltage regulation is restored. Additionally a reset pulse is issued if the
correct watchdog is not received within the programmed time. Reset
pulses continue until the correct watchdog signal is received. The reset
pulse width and frequency, as well as the Power On Reset delay, are set
by one external RC network.
The current mode PWM switching regulator is comprised of an
error amplifier with selectable feedback inputs, a current sense
amplifier, an adjustable oscillator, and a 1.4 A output power switch
with anti–saturation control. The switching regulator can be
configured in a variety of topologies.
The CS5111 is load dump capable and has protection circuitry
which includes overvoltage shutdown, current limit on the linear and
switcher outputs, and an overtemperature limiter.
Features• Linear Regulator 5.0 V ± 2% @ 100 mA Switching Regulator 1.4 A Peak Internal Switch 120 kHz Maximum Switching Frequency 5.0 V to 26 V Operating Supply Range Smart Functions Watchdog RESET ENABLE Protection Overvoltage Overtemperature Current Limit 54 V Peak Transient Capability
