SWCS049A datasheet(43/144 Pages) TI

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SWCS049-010

EN2

VDD2/VFB2

VDD1/VFB1

1.2 V

EN1

NRESPWRON

Low-power mode

PFM (pulse skipping) mode

Switch-on sequence

Switch-off sequence

Device on

PWM mode

SW1

tdOEN

0 V

tdVDDEN

tdEN

3.3 V

tdVDDEN

tdSOFF2

tdEN

SWCS046-009

EN1

LDO1

1.2 V

LDO4

1.8 V

EN2

NRESPWRON

tdVEN

tdEN

Switch-on sequence

Switch-off sequence

Device on

tdEN

tdSOFF2

tdEN

Low-power mode

TPS65911

www.ti.com

SWCS049S – JUNE 2010 – REVISED AUGUST 2018

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Product Folder Links: TPS65911

Specifications

5.21.3.4 Power Supplies State Control Through EN1 and EN2 Signals

NOTE: Register setting: LDO1_EN1 = 1, LDO4_EN2 = 1, and LDO4_KEEPON = 1.

Figure 5-6. LDO Type Supplies State Control Through EN1 and EN2

NOTE: Register setting: VDD2_EN2 = 1, VDD1_EN1 = 1, VDD1_KEEPON = 1, VDD1_PSKIP = 0, and SEL[6:0] = hex00 in

VDD2_SR_REG.

Figure 5-7. VDD1 and VDD2 Supplies State Control Through EN1 and EN2

Table 5-7. Supplies State Control Through EN1 and EN2 Timing Characteristics

MIN

NOM

MAX

UNIT

tdEN

NRESPWRON to supply state change delay, EN1 or EN2 driven

tdOEN

EN1 or EN2 edge to supply state change delay

1 × tCK32k =

µs

tdVDDEN

EN1 or EN2 edge to VDD1 or VDD2 DCDC turnon delay

3 × tCK32k =

µs

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