ADP7159ARDZ-02-R7 datasheet(20/23 Pages) AD

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ADP7159

Data Sheet

Rev. B | Page 20 of 23

PSRR PERFORMANCE

The ADP7159 is available in four models that optimize power

dissipation and PSRR performance as a function of input and

output voltage. See Table 9 and Table 10 for selection guides.

It is recommended to select the corresponding product model for a

particular output voltage range to achieve optimized PSRR

performance. For example, select the ADP7159-04 model for VOUT

= 3.3 V to achieve >65 dB PSRR (10 Hz to 100 kHz) with 500 mV

headroom.

When considering a VOUT = 1.8 V case, note that all four product

models can generate a 1.8 V output, but the ADP7159-01 model

provides the best PSRR performance, though other models, like the

ADP7159-04, are still capable of generating a 1.8 V output for

PSRR relaxed applications.

The ADP7159 supports a 2.3 V to 5.5 V input range. Typically, a

minimum 500 mV headroom is required to achieve the best PSRR

performance above the maximum output voltage (VOUT_MAX) at

2 A. For example, the ADP7159-04 requires a minimum 3.8 V

input voltage to achieve the best PSRR performance for a 3.3 V

output at 2 A.

Table 9. Model Selection Guide for PSRR

Model

VOUT_MAX (V)

PSRR (dB) at 2 A; VIN = VOUT_MAX + 0.5 V

PSRR (dB) at 1.2 A; VIN = VOUT_MAX + 0.5 V

10 kHz

100 kHz

1 MHz

10 kHz

100 kHz

1 MHz

ADP7159-01

1.8

ADP7159-02

2.3

ADP7159-03

2.9

ADP7159-04

3.3

Table 10. Model Selection Guide for Input Voltage

Model

AdjustableVOUT Range (V)

VOUT Range (V) for Optimized PSRR

VREG(V)

VINRange (V)

ADP7159-01

1.2 to 1.8

2.1

2.3 to 5.5

ADP7159-02

1.2 to 2.3

1.8 to 2.3

2.6

2.8 to 5.5

ADP7159-03

1.2 to 2.9

2.3 to 2.9

3.2

3.4 to 5.5

ADP7159-04

1.2 to 3.3

2.9 to 3.3

3.6

3.8 to 5.5

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