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AP1184T525A Datasheet(PDF) 4 Page - Anachip Corp |
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AP1184T525A Datasheet(HTML) 4 Page - Anachip Corp |
4 / 11 page 4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator AP1184 Anachip Corp. www.anachip.com.tw Rev.1.1 Sep 7, 2004 4/11 Electrical Characteristics(Continued) Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150 oC. Typical value refer to Tj=25oC. Vout=Vsense. Sym. Parameter Test Condition Min. Typ. Max. Unit Thermal Regulation 30mS Pulse 0.01 0.02 %/W Ripple Rejection Vctrl =5V, Vin=5V, Io=4A, Vadj=0V, Tj=25, Vripple=1Vpp at 120Hz 60 70 dB Control Pin Current Vadj=0V for all conditions below. Vctrl =2.75V, Vin=2.05V, Io=1.5A Vctrl =2.75V, Vin=2.05V, Io=3A Vctrl=2.75V, Vin=2.05V, Io=4A 6 30 33 25 60 70 mA Iadj Adjust Pin Current Vctrl=2.75V, Vin=2.05,Vadj=0 50 150 µA JC θ Thermal Resistance Junction-to-Case TO-263: Control Circuitry/Power Transistor TO-220: Control Circuitry/Power Transistor SOP-7: Control Circuitry/Power Transistor 3.5 2.5 20 OC/W OC/W OC/W NOTE: AP1184-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. Package Max Pd. Remarks TO263/TO220 2.4W~4.4W With heat sink or amount of copper board needed. SOP7 1W~2W With heat sink or amount of copper board needed. Functional Descriptions Introduction The AP1184 regulator is 5 terminal device designed specifically to provide extremely low dropout voltages comparable to the PNP type without the disadvantage of the extra power dissipation due to the base current associated with PNP regulators. This is done by bringing out the control pin of the regulator that provides the base current to the power NPN and connecting it to a voltage that is greater than the voltage present at the Vin pin. This flexibility makes the AP1184 ideal for applications where dual inputs are available such as a computer motherboard with an ATX style power supply that provides 5V and 3.3V to the board. One such application is the new graphic chip sets that require anywhere from 2.4V to 2.7V supply. The AP1184 can easily be programmed with the addition of two external resistors to any voltages within the range of 1.25V to 15.5V. Another major requirement of these graphic chips is the need to switch the load current from zero to several amps in tens of nanoseconds at the processor pins, which translates to an approximately 300 to 500ns of current step at the regulator. In addition, the output voltage tolerances are also extremely tight and they include the transient response as part of the specification. The AP1184 is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer number of output capacitors. Another feature of the device is its true remote sensing capability that allows accurate voltage setting at the load rather than at the device. Output Voltage Setting The AP1184-ADJ can be programmed to any voltages in the range of 1.25V to 15.5V with the addition of R1 and R2 external resistors according to the following formula: |
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