TPS62361BYZHT datasheet(22/52 Pages) TI

22 / 52 page

TPS62360, TPS62361B, TPS62362

SLVSAU9A

– MAY 2011 – REVISED AUGUST 2011

www.ti.com

The I2C interface is operable when VDD and AVIN are present, regardless of the state of the EN pin.

If the device is disabled by pulling the EN to a logic low, the output capacitor can actively be discharged. Per

default, this feature is disabled. Programming the EN_DISC bit to a logic high will discharge the output capacitor

via a typ. 300

Ω path on the SENSE+ pin.

SOFT START

The device incorporates an internal soft start circuitry that controls the ramp up of the output voltage after

enabling the device. This circuitry eliminates inrush current to avoid excessive voltage drops of primary cells and

rechargeable batteries with high internal impedance.

During soft start, the output voltage is monotonically ramped up to the minimum programmable output voltage.

After reaching this threshold, the output voltage is further increased following the slope as programmed in the

ramp rate settings (see RAMP RATE CONTROLLING) until reaching the programmed output voltage. Once the

nominal voltage is reached, regular operation as described above will continue.

The device is able to start into a pre biased output capacitor as well.

PROGRAMMING THE OUTPUT

The TPS6236x devices offer four similar registers to program the output. Two dedicated hardware input pins,

VSEL0 and VSEL1, are implemented for choosing the active register. The logic state of VSEL0 and VSEL1

select the register whose settings are present at the output. The VSEL0 and VSEL1 pins must be terminated

unless the internal pull-down resistors are activated.

The registers have a certain initial default value (see Table 2) and can be readjusted via I2C during operation.

This allows a simple transition between several output options by triggering the dedicated input pins. At the same

time since the presets can be readjusted during operation, this offers highest flexibility.

Table 2. Output Presets

DEFAULT OPERATION

INPUT PINS

DEFAULT OUTPUT VOLTAGE [V]

MODE

PRESET

I2C REGISTER

TPS62360, TPS62361B,

VSEL1

VSEL0

TPS62360

TPS62361B

TPS62362

SET0

0x00h

– see Table 12,

Power Save Mode

1.40

0.96

1.23

Table 13 and Table 14

SET1

0x01h

– see Table 15,

Power Save Mode

1.00

1.40

1.00

Table 16 and Table 17

SET2

0x02h

– see Table 18,

Power Save Mode

1.40

1.16

1.20

Table 19 and Table 20

SET3

0x03h

– see Table 21,

Power Save Mode

1.10

1.16

1.10

Table 22 and Table 23

Via the I2C interface and/or the four preset options, the following output parameters can be changed:

•

Output voltage from 0.77 V to 1.4 V (TPS62360/62) and 0.5V to 1.77V (TPS62361B) with 10 mV granularity

•

Mode of operation: Power Save Mode or forced PWM mode

The slope for transition between different output voltages (Ramp Rate) can be changed via I2C as well. The

slope applies for all presets globally. See RAMP RATE CONTROLLING for further details.

Since the output parameters can be changed by dedicated pins for selecting presets and by I2C, the following

use scenarios are feasible:

•

Control the device via dedicated pins only, after programming the presets, to choose and change within the

programmed settings

•

Program via I2C only. The dedicated input pins have fixed connections. Changes are conducted by changing

the preset values of the active register.

•

Dedicated input pins and I2C mixed operation. The non active presets might be changed. The dedicated input

pins are used for the transition to the new output condition. Changes within an active preset via I2C are

feasible as well.

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Product Folder Link(s): TPS62360 TPS62361B TPS62362

TPS62361BYZHT Datasheet(PDF) 22 Page - Texas Instruments

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