DA9021 datasheet(104/142 Pages) DIALOG

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DA9021/22

System PMIC with high efficiency USB power manager

Datasheet

Revision 2.5

17-Feb-2017

CFR0011-120-00 Rev 5

104 of 142

Charger Detection and

Selector, OV-Protection,

USB-Suspend

Charger Buck

with VBAT

tracking

Reverse current protection

Battery Charger and

ACTIVE DIODE System Load Switch

Ext. ACTIVE DIODE

System Load Switch

VBAT

TBAT

Tjunc

ICHG

VBAT

TBAT

Charge Timer

VDD_REF

Battery Switch

ICHGsense

Automatic

2-way

Load Switch

USB charger detection

Linear charging Current/Voltage

Control with DCCC

Battery Temperature Supervision

and IC Thermal Regulation

ACTIVE DIODE System Load Switch

GP-ADC

ISET_BUCK

Figure 43: Charger block diagram

19.1 High efficiency charger DC-DC buck converter

In order to minimise the total system power loss at high input currents, DA9021/22

’s main system

power VDDOUT is supplied out of a high efficient DC-DC converter, which is able to track

VBAT+200 mV (with minimum VDDOUT = 3.6 V).

When powering up VDDOUT the DC-DC converter provides a soft-start circuitry and the current limit

is implemented to meet the USB 2.0 specification for currents spikes where charge peaks are always

less than an equivalent bypass capacitive load of 10 µF. An integrated over voltage protection and

supply selection controls the behaviour of these power paths.

The buck converter operates at a high frequency (2 MHz). This switching frequency is chosen to be

high enough to allow the use of a small 4.7 µH inductor. To guarantee high efficiency at high load

currents the series resistance of the coil is limited to 100 m

Ω (at 1000 mA). Under light load

conditions the buck converter can be forced by the host to a low current PFM mode.

19.2 Charger supply detection/VBUS monitoring

DA9021/22 provides a charger input VBUS, which can be supplied either from a USB host/hub, a

USB type host/hub charger or a dedicated wall charger. To protect DA9021/22 against destruction

from invalid supplies an overvoltage protection circuitry will disconnect every charger that supplies

more than 5.6 V.

DA9021 Datasheet(PDF) 104 Page - Dialog Semiconductor

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