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LT3015IDD Datasheet(PDF) 11 Page - Linear Technology |
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LT3015IDD Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  LT3015 11 3015f BLOCK DIAGRAM –1.20V 1.21V VREF + ADJ IN SHDN I LIMIT FOLDBACK OUT NPN DRIVER BIAS CIRCUITRY ADJ PIN BIAS CURRENT COMPENSATION QPOWER 3015 BD VTH RSNS + _ + – ERROR AMP – + I LIMIT AMP GND The LT3015 regulator is a 1.5A negative low dropout linear regulator featuring precision current limit and precision bi-directional shutdown. The device supplies up to 1.5A of output load current at a typical dropout voltage of 310mV. Moreover, the low 1.1mA operating quiescent current drops to less than 1μA in shutdown. In addition to low quiescent current, the LT3015 incorporates several protection features that make it ideal for battery powered applications. In dual supply applications where the regu- lator’s load is returned to a positive supply, OUT can be pulled above GND by 30V and still allow the LT3015 to start up and operate. Adjustable Operation The LT3015 regulator has an output voltage range of –1.22V to –29.5V. Output voltage is set by the ratio of two external resistors as shown in Figure 1. The device regulates the output to maintain the ADJ pin voltage to –1.22V referred to ground. The current in R1 equals –1.22V/R1 and the current in R2 equals the current in R1 plus the ADJ pin bias current. The ADJ pin bias current, 30nA at 25°C, flows into the ADJ pin. Calculate the output voltage using the formula shown in Figure 1. The value of R1 should be less than 50k to minimize errors in the output voltage created by the ADJ pin bias current. Note that in shutdown, the output is off and the divider current is zero. Curves of APPLICATIONS INFORMATION ADJ Pin Voltage vs Temperature, ADJ Pin Bias Current vs Temperature and ADJ Pin Bias Current vs Input Voltage appear in the Typical Performance Characteristics section. The adjustable device is tested and specified with the ADJ pin tied to the OUT pin for a –1.22V output voltage. Specifications for output voltages greater than –1.22V are proportional to the ratio of the desired VOUT to –1.22V (VOUT/–1.22V). For example, load regulation for an out- put current change of –1mA to –1.5A is typically 2mV at VOUT = –1.22V. At VOUT = –5V, load regulation equals: (–5V/–1.22V) • (2mV) = 8.2mV GND LT3015 ADJ OUT SHDN IN VOUT CIN VIN R1 R2 COUT 3015 F01 Figure 1. Adjustable Operation VOUT = –1.22V 1+ R2 R1 ⎛ ⎝⎜ ⎞ ⎠⎟ + IADJ () R2 () VADJ = –1.22V ANDIADJ = 30nA AT 25°C OUTPUT RANGE = –1.22 TO – 29.5V |
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