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RT9167-18GB Datasheet(PDF) 8 Page - Richtek Technology Corporation

Part # RT9167-18GB
Description  The RT9167B is a 300mA low dropout and low noise
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9167-18GB Datasheet(HTML) 8 Page - Richtek Technology Corporation

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RT9167B
8
DS9167B-01 April 2011
www.richtek.com
Load-Transient Considerations
The RT9167B load-transient response graphs (see Typical
Operating Characteristics) show two components of the
output response : a DC shift from the output impedance
due to the load current change, and the transient response.
The DC shift is quite small due to the excellent load
regulation of the IC. Typical output voltage transient spike
for a step change in the load current from 0mA to 50mA is
tens mV, depending on the ESR of the output capacitor.
Increasing the output capacitor's value and decreasing the
ESR attenuates the overshoot.
Shutdown Input Operation
The RT9167B is shutdown by pulling the EN input low,
and turned on by driving the input high. If this feature is
not to be used, the EN input should be tied to VIN to keep
the regulator on at all times (the EN input must not be left
floating).
To ensure proper operation, the signal source used to
drive the EN input must be able to swing above and below
the specified turn-on/turn-off voltage thresholds which
guarantee an ON or OFF state (see Electrical
Characteristics). The ON/OFF signal may come from
either CMOS output, or an open-collector output with pull-
up resistor to the RT9167B input voltage or another logic
supply. The high-level voltage may exceed the
RT9167B input voltage, but must remain within the
absolute maximum ratings for the EN pin.
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage differential
(or dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this will determine
the useful end-of-life battery voltage. Because the
RT9167B uses a P-Channel MOSFET pass transistor, the
dropout voltage is a function of drain-to-source on-
resistance [RDS(ON)] multiplied by the load current.
Operating Region and Power Dissipation
The maximum power dissipation of RT9167B depends on
the thermal resistance of the case and circuit board, the
temperature difference between the die junction and
ambient air, and the rate of airflow. The power dissipation
across the device is P = IOUT (VIN
− VOUT). The maximum
power dissipation is : PMAX = (TJ
− TA) /θJA
where TJ
− TA is the temperature difference between the
RT9167B die junction and the surrounding environment,
θJA is the thermal resistance from the junction to the
surrounding environment. The GND pin of the RT9167B
performs the dual function of providing an electrical
connection to ground and channeling heat away. Connect
the GND pin to ground using a large pad or ground plane.
Current Limit and Thermal Protection
The RT9167B includes a current limit which monitors and
controls the pass transistor's gate voltage limiting the
output current to 400mA min. Thermal-overload protection
limits total power dissipation in the RT9167B. When the
junction temperature exceeds TJ = 155
°C, the thermal
sensor signals the shutdown logic turning off the pass
transistor and allowing the IC to cool. The thermal sensor
will turn the pass transistor on again after the IC's junction
temperature cools by 10
°C, resulting in a pulsed output
during continuous thermal-overload conditions. Thermal-
overloaded protection is designed to protect the RT9167B
in the event of fault conditions. Do not exceed the absolute
maximum junction-temperature rating of TJ = 150
°C for
continuous operation. The output can be shorted to ground
for an indefinite amount of time without damaging the part
by cooperation of current limit and thermal protection.
Thermal Considerations
For continuous operation, do not exceed absolute
maximum junction temperature. The maximum power
dissipation depends on the thermal resistance of the IC
package, PCB layout, rate of surrounding airflow, and
difference between junction and ambient temperature. The
maximum power dissipation can be calculated by the
following formula :
PD(MAX) = (TJ(MAX)
− TA) / θJA
where TJ(MAX) is the maximum junction temperature, TA is
the ambient temperature, and
θJAis the junction to ambient
thermal resistance.
For recommended operating condition specifications of
the RT9167B, the maximum junction temperature is 125
°C
and TA is the ambient temperature. The junction to ambient
thermal resistance,
θJA, is layout dependent. For MSOP-


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