ADP1878ACPZ-0.6-R7(RevA) View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADP1878ACPZ-0.6-R7
(Rev.:RevA)

Synchronous Buck Controller with Constant On Time and Valley Current Mode

Analog Devices 

Data Sheet

THEORY OF OPERATION

BLOCK DIAGRAM

ADP1878/ADP1879

ADP1878/ADP1879

690mV

FB

600mV

530mV

PGOOD

tON TIMER

VREG

VIN

EN

VREG

PRECISION

ENABLE

630mV

THRESHOLD/

HYSTERESIS

LDO

TO ENABLE

ALL BLOCKS

C

I

SW

INFORMATION

R (TRIMMED)

tON = 2RC(VOUT/VIN)

SS

COMP

FB

REF

SW FILTER

BIAS BLOCK

AND REFERENCE

REF_ZERO

ISS

SS

COMP

PSM

SS_REF

ERROR

AMP

0.6V

LOWER

COMP

CLAMP

REF_ZERO

PWM

CS

AMP

IREV

COMP

CS GAIN SET

VREG

STATE

MACHINE

TON

BG_REF

IN_PSM HS_0

IN_SS

HS

IN_HICCUP

SW

COMP

PWM

IREV

LS

LS_0

LEVEL

SHIFT

ADC

RES DETECT AND

GAIN SET

0.4V

300kΩ

HS

VREG

LS

8kΩ

800kΩ

BST

DRVH

SW

DRVL

PGND

GND

RES

Figure 64. ADP1878/ADP1879 Block Diagram

The ADP1878/ADP1879 are versatile current-mode, synchronous

step-down controllers that provide superior transient response,

optimal stability, and current-limit protection by using a constant

on time, pseudo fixed frequency with a programmable current

sense gain, current control scheme. In addition, these devices offer

optimum performance at low duty cycles by using a valley, current-

mode control architecture. This allows the ADP1878/ADP1879

to drive all N-channel power stages to regulate output voltages

to as low as 0.6 V.

Rev. A | Page 17 of 40

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