PIFE32251B-R47MS datasheet(39/96 Pages) TI1

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TPS65094

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SWCS133C – SEPTEMBER 2015 – REVISED FEBRUARY 2019

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Detailed Description

6.3.4

LDOs and Load Switches

6.3.4.1

VTT LDO

Powered from the BUCK6 output (VDDQ), the VTT LDO tracks VDDQ and regulates to half of the VDDQ

voltage for proper DDR termination. The LDO current limit is OTP dependent, and it is designed

specifically to power DDR memory. The VTT LDO is enabled by assertion (L

→ H) of the SLP_S0B pin

and is disabled by deassertion (H

→ L) of the same pin. The LDO core is a transconductance amplifier

with large gain, and it drives a current output stage that either sources or sinks current depending on the

deviation of VTTFB pin voltage from the target regulation voltage.

6.3.4.2

LDOA1–LDOA3

The TPS65094x device integrates three optional general-purpose LDOs. LDOA1 is powered from a 5-V

supply through the DRV5V_2_A1 pin and it can be factory configured to be an Always-On rail as long as a

valid power supply is available at VSYS. See Table 6-5 for LDOA1 output voltage options. LDOA2 and

LDOA3 share a power input pin (PVINLDOA2_A3). The output regulation voltages are set by writing to

LDOAx_VID[3:0] bits (Reg 0x9A, 0x9B, and 0xAE). See Table 6-6 for LDOA2 and LDOA3 output voltage

options. LDOA1 is controlled by LDOA1CTRL register. LDOA2 and LDOA3 can be controlled either by the

LDOLS_EN pin or by writing to the LDOA2_EN bit (Reg 0xA0) and the LDOA3_EN bit (Reg 0xA1) as long

as LDOLS_EN is low.

Table 6-5. LDOA1 Output Voltage Options

VID Bits

VOUT

VID Bits

VOUT

VID Bits

VOUT

VID Bits

VOUT

0000

1.35

0100

1.8

1000

2.3

1100

2.85

0001

1.5

0101

1.9

1001

2.4

1101

3.0

0010

1.6

0110

2.0

1010

2.5

1110

3.3

0011

1.7

0111

2.1

1011

2.7

1111

Not Used

Table 6-6. LDOA2 and LDOA3 Output Voltage Options

VID Bits

VOUT

VID Bits

VOUT

VID Bits

VOUT

VID Bits

VOUT

0000

0.70

0100

0.90

1000

1.10

1100

1.30

0001

0.75

0101

0.95

1001

1.15

1101

1.35

0010

0.80

0110

1.00

1010

1.20

1110

1.40

0011

0.85

0111

1.05

1011

1.25

1111

1.50

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