STA1275 datasheet(94/109 Pages) STMICROELECTRONICS

94 / 109 page

Electrical characteristics

STA1295, STA1275

94/109

DS12586 Rev 5

4.12.4

USB 1V8 LDO (3V3TO1V8 low power regulator)

4.12.5

USB 1V1 LDO (3V3TO1V1 low power regulator)

PSRR

S Power supply rejection at 2 MHZ @ NO load

—

-12

Tstart

Start up time from power down to active after input

supply stabilizes (Supply rise time of 1 µs)

——

300

µs

1. This is mandatory for proper device functionality.

Table 51. 3V3TO2V5 regulator (continued)

Symbol

Parameter

Limit values

Unit

Min.

Typ.

Max.

Table 52. 3V3TO1V8 regulator

Symbol

Parameter

Limit values

Unit

Min.

Typ.

Max.

VASupply SR Analog supply(1)

1. USB_VREG3V3_1V8, USB0_VDD3V3 and USB1_VDD3V3 are internally shorted in the device IO ring.

3.0

3.3

3.6

Vout

P Output voltage @ Iload = max

1.71

—

1.87

Cload

SR Total off chip capacitance value(2)

2. This is mandatory for proper device functionality.

—4.7

—

µF

ESR of each external capacitor in frequency range

of 100 kHz - 100 MHz

10 m

—

150 m

PSRR_DC

S Power supply rejection at DC @ NO load

—

-40

PSRR

S Power supply rejection at 2 MHz @ NO load

—

-11

Tstart

Start up time from power down to active after input

supply stabilizes (Supply rise time of 1 µs)

—

300

µs

Table 53. 3V3TO1V1 regulator

Symbol

Parameter

Limit values

Unit

Min. Typ. Max.

VASupply

SR Analog supply

3.0

3.3

3.6

Vout

P Output voltage @ Iload = max

1.0

1.1

—

Cload

SR Total off chip capacitance value(1)

1. Mandatory for proper device functionality

—4.7

—

µF

PSRR_DC

S Power supply rejection at DC @ Full load

—

-30

PSRR

S Power supply rejection at 1 MHz @ Full load

—

-28

Tstart

Start up time from power down to active after input

supply stabilizes (Supply rise time of 1 µs)

——

300

µs

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