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5962F0253401VXA

RAD-HARD POSITIVE FIXED VOLTAGE REGULATORS

STMicroelectronics 

RHFL4913 FIXED VERSION

Figure 2: Application Diagram For Remote Sensins Operation

DEVICE DESCRIPTION

The RHFL4913 Fixed Voltage contains a PNP type power element controlled by a signal resulting from

amplified comparison between the internal temperature compensated Band-Gap cell and the fraction of

the desired Output Voltage value. This fractional value is obtained from an internal-to-die resistor divider

bridge set by STMicroelectronics. The device is protected by several functional blocks.

Low pin count Package limitations

Some functions (INHIBIT, OCM, SENSE) are not available due to lack of pins. Corresponding die pads

are by default connected inside silicon.

SENSE pin

The Load voltage is applied by a Kelvin line connected to SENSE pin: Voltage feed-back comes from the

internal divider resistor bridge. Therefore possible output voltages are set by manufacturer mask metal

options. SENSE pin is not available in 3pin packages.

INHIBIT ON-OFF Control

By setting INHIBIT pin TTL-High, the Device switches off the Output Current and Voltage. The Device is

ON when INHIBIT pin is set Low. Since INHIBIT pin is internally pulled down, it can be left floating in case

Inhibit function is not utilized. INHIBIT pin is not available in 3pin packages.

Overtemperature protection

A temperature detector internally monitors the power element junction temperature. The Device goes

OFF at approx. 175°C, returning to ON mode when back to approx. 40°C. It is worth noting that when the

internal temperature detector reaches 175°C, the active power element can be at 225°C: Device reliability

cannot be granted in case of extensive operation under these conditions.

Overcurrent protection

ISC pin. An internal non-fold back Short-Circuit limitation is set with ISHORT > 3.8A (VO is 0V). This value

can be reduced by an external resistor connected between ISC pin and VI pin, with a typical value range

of 10kΩ to 200kΩ. This adjustment feature is not available in 3pin packages. To keep excellent VO

regulation, it is necessary to set ISHORT 1.6 times greater than the maximum desired application IO. When

IO reaches ISHORT – 300mA, the current limiter overrules Regulation and VO starts to drop and the OCM

flag is risen. When no current limitation adjustment is required, ISC pin must be left unbiased (as it is in 3

pin packages).

OCM pin

Goes Low when current limiter starts to be active, otherwise VOCM = VI. It is bufferized and can sink 10mA.

OCM pin is internally pulled-up by a 5 kΩ resistor. Not available in 3pin packages.

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