PWM mode at medium / heavy load

VOUT_PFM

VOUT_NOM

Output Voltage

t

PFM mode at light load

Current Limit

Detect

Control Logic

Soft

start

Thermal

Shutdown

UVLO

GM

Gate Drive

VIN

PG

GND

FB

Vref

SW

+

_

DBG

DBG

PMOS

NMOS

Valley

Current

Detect

Pulse

Modulator

Duty Detect

SW

Copyright © 2016, Texas Instruments Incorporated

8

TLV62565, TLV62566

SLVSBC1D – OCTOBER 2013 – REVISED OCTOBER 2016

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Product Folder Links: TLV62565 TLV62566

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Copyright © 2013–2016, Texas Instruments Incorporated

Functional Block Diagrams (continued)

Figure 5. TLV62566 Functional Block Diagram

9.3 Feature Description

9.3.1 Power Save Mode

The device integrates a Power Save Mode with PFM to improve efficiency at light load, as shown in Figure 6

When the inductor current becomes discontinuous, the device enters Power Save Mode. In Power Save Mode,

the FB voltage is typically 0.9% higher than the nominal value of 0.6 V. Thus the device ramps up the output

voltage with several pulses, and the device stops switching when the output voltage reaches 0.9% above the

nominal output voltage.

When the inductor current becomes continuous again, the device leaves Power Save Mode and the FB voltage

is back to the norminal value of 0.6 V.

Figure 6. Output Voltage in PFM/PWM Mode