TPS62870 datasheet(19/66 Pages) TI2

19 / 66 page

Output Voltage (V)

fsw = 2.25MHz and L = 110nH

0.3

0.6

0.9

1.2

1.5

1.8

2.1

2.4

2.7

3.3

0.05

0.1

0.15

0.2

0.25

0.3

Vin = 2.7 V

Vin = 3.3 V

Vin = 5 V

Figure 7-5. Output Current PFM-DCM Entry Threshold

The user can configure the device to use either forced PWM (FPWM) mode or power save mode (PSM):

• In forced PWM mode, the device uses PWM-CCM at all times.

• In power save mode, the device uses PWM-CCM at medium and high loads, PWM-DCM at low loads, and

PFM-DCM at very low loads. The transition between the different operating modes is seamless.

Table 7-1 shows the function table of the MODE/SYNC pin and the FPWMEN bit in the CONTROL1 register,

which control the operating mode of the device.

Table 7-1. FPWM Mode and Power-Save Mode Selection

MODE/SYNC PIN

FPWMEN BIT

OPERATING MODE

REMARK

Low

PSM

Do not use in a stacked

configuration.

FPWM

High

FPWM

Sync Clock

FPWM

7.3.3 Precise Enable

The Enable (EN) pin is bidirectional and has two functions:

• As an input, EN enables and disables the DC/DC converter in the device.

• As an output, EN provides a SYSTEM_READY signal to other devices in a stacked configuration.

–

SYSTEM_READY

VIT(EN)

ENABLE

CONTROL3:SINGLE

Figure 7-6. Enable Functional Block Diagram

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TPS62870, TPS62871, TPS62872, TPS62873

SLVSGC5E – JANUARY 2023 – REVISED OCTOBER 2025

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