ADP7157ACPZ-02-R7 datasheet(21/24 Pages) AD

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ADP7157

Data Sheet

Rev. A | Page 20 of 23

PSRR PERFORMANCE

The ADP7157 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 ADP7157-04 model for

VOUT = 3.3V to achieve >80 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 ADP7157-01 model

provides the best PSRR performance, though other models, like

the ADP7157-04, are still capable of generating 1.8 V output for

PSRR relaxed applications.

The ADP7157 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

1.2 A. For example, ADP7157-04 requires a minimum 3.8 V

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

output at 1.2 A.

Table 9. Model Selection Guide for PSRR

Model

OUT_MAX (V)

PSRR (dB) at 1.2 A; V

IN = VOUT_MAX + 0.5 V

PSRR (dB) at 1.2 A; V

IN = VOUT_MAX + 0.6 V

10 kHz

100 kHz

1 MHz

10 kHz

100 kHz

1 MHz

ADP7157-01

1.8

ADP7157-02

2.3

ADP7157-03

2.9

ADP7157-04

3.3

Table 10. Model Selection Guide for Input Voltage

Model

AdjustableV

OUT Range (V)

OUT Range (V) for Optimized PSRR

REG (V)

INRange (V)

ADP7157-01

1.2 to 1.8

2.1

2.3 to 5.5

ADP7157-02

1.2 to 2.3

1.8 to 2.3

2.6

2.8 to 5.5

ADP7157-03

1.2 to 2.9

2.3 to 2.9

3.2

3.4 to 5.5

ADP7157-04

1.2 to 3.3

2.9 to 3.3

3.6

3.8 to 5.5

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