LT3045 datasheet(29/44 Pages) AD

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Data Sheet

LT83401/LT83402

analog.com

Rev. 0

29 of 44

Table 5. Examples of Output Capacitors with Desirable Frequency Characteristics for 2MHz Operation

PART DESCRIPTION

MANUFACTURER/PART NUMBER

22µF, X7R, 10V, 20% 1206

MURATA, GRM31CR71A226ME15K

10µF, X7R, 25V, 10% 1206

MURATA, GRM31CR71E106KA12

4.7µF, X7S, 16V, 10% 0603

MURATA, GRM188C71C475KE21

Figure 51.Frequency Characteristics of Example Output Capacitors for 2MHz Operation

Output Voltage

The LT83401/LT83402 incorporates a precision 100μA current source flowing out of the SET pin, which also connects

to the error amplifier’s non-inverting input. Figure 52 shows that connecting a resistor from SET to GND generates a

reference voltage for the error amplifier. This reference voltage is simply the product of the SET pin current and the

SET pin resistor. The error amplifier’s unity-gain configuration produces a low-impedance version of this voltage on

its inverting input, the OUTS pin, which is externally connected to the output voltage of the circuit.

Figure 52. Adjustable Reference for Error Amplifier

The LT83401/LT83402’s error amplifier and current reference allow for a wide output voltage range from 0V (using a

0Ω resistor) to 15V. A PNP-based input pair is active from VOUT equals 0V up to VIN minus 1.4V, and an NPN-based input

pair is active for output voltages where VIN – VOUT < 1V or less, with a smooth transition between the two input pairs

in between these ranges. The PNP-based input pair is designed to offer the best overall performance as it is active in

GRM31CR71A226ME15K (22µF)

GRM31CR71E106KA12 (10µF)

GRM188C71C475KE21 (4.7µF)

FREQUENCY (Hz)

100

10k

100k

10M

100M

0.001

0.01

0.1

100

10k

4.7µF

COUT

RSET

CSET

SET

OUTS

GND

DRIVERS

100µA

VIN

VOUT

LT83401/

LT83402

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