Data Sheet

LT3097

SPECIFICATIONS

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Rev. 0 | 8 of 45

7 The dropout voltage is the minimum input-to-output differential voltage needed to maintain regulation at a specified output current. The dropout voltage is measured when

output is 1% out of regulation. This definition results in a higher dropout voltage compared to hard dropout, which is measured when VINP = VOUTP (NOMINAL). For output

voltages less than 1.5 V, the dropout voltage is limited by the minimum input-voltage specification. See Figure 30 for the dropout voltage as a function of output current,

measured in a typical application circuit. See Figure 32 for the dropout voltage as a function of temperature, measured in a typical application circuit.

8 The dropout voltage is the minimum input-to-output differential voltage needed to maintain regulation at a specified output current. The dropout voltage is measured when

output is 1% out of regulation. This definition results in a higher dropout voltage compared to hard dropout, which is measured when VINN = VOUTN (NOMINAL). For output

voltages between 0 V and –1.8 V, the dropout voltage is limited by the minimum input-voltage specification. See Figure 31 for the dropout voltage as a function of output

current, measured in a typical application circuit. See Figure 33 for the dropout voltage as a function of temperature, measured in a typical application circuit.

9 The GND pin current is tested with VINP = VOUTP(NOMINAL) and a current source load. Therefore, the LT3097 is tested while operating in dropout, which is the worst-case

GND pin current. The GND pin current decreases at higher input voltages. Note that the GND pin current does not include the SETP pin or the ILIMP pin current; however,

quiescent current does include the SETP and ILIMP pin currents.

10 The GND pin current is tested with VINN = VOUTN(NOMINAL) and a current source load. Therefore, the LT3097 is tested while operating in dropout, which is the worst-case

GND pin current. The GND pin current decreases at higher input voltages. Note that the GND pin current does not include the SETN pin or the ILIMN pin current; however,

quiescent current does include the SETN and ILIMN pin currents.

11 Adding a capacitor across the SETP pin resistor decreases the positive output voltage noise. Adding this capacitor bypasses the thermal noise of the resistor on the SETP

pin as well as the noise of the positive reference current. The positive output noise then equals the positive error-amplifier noise. The use of a SETP pin bypass capacitor

also increases the positive start-up time.

12 Adding a capacitor across the SETN pin resistor decreases the negative output voltage noise. Adding this capacitor bypasses the thermal noise of the resistor on the SETN

pin as well as the noise of the negative reference current. The negative output noise then equals the negative error-amplifier noise. The use of a SETN pin bypass capacitor

also increases the negative start-up time.

13 The positive internal back-up current-limit circuitry incorporates foldback protection that decreases the positive current limit for VINP – VOUTP > 12 V. Some level of output

current is provided at all VINP – VOUTP differential voltages. See Figure 56 for the current limit as a function of VINP – VOUTP.

14 The positive current-limit programming scale factor is specified while the internal backup current limit is not active. Note that the positive internal current limit has foldback

protection for VINP – VOUTP differentials greater than 12 V.

15 The negative internal back-up current-limit circuitry incorporates foldback protection that decreases the negative current limit for VOUTN – VINN > 7 V. Some level of output

current is provided at all VOUTN – VINN differential voltages. See Figure 57 for the current limit as a function of VINN – VOUTN.

16 The negative current-limit programming scale factor is specified while the internal backup current limit is not active. Note that the negative internal current limit has foldback

protection for VOUTN – VINN differentials greater than 7 V.

17 For positive output voltages less than 1 V, the positive regulator requires a 10 µA minimum load current for stability.

18 For negative output voltages between 0 V and –1.5 V, the negative regulator requires a 10 µA minimum load current for stability.