DA9021 datasheet(88/142 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

88 of 142

18 DC/DC buck converters

DA9021/22 includes three DC-DC buck converters with Dynamic Voltage Control (DVC). DA9022

also includes three DC-DC buck converters, two with DVC and one with fixed output voltage

(programmable from OTP). The output voltages are fully programmable via the control interface

allowing optimisation of the complete system for maximum performance and power efficiency. For

security reasons the reprogramming of output voltages from the control interfaces can be disabled

via control V_LOCK.

NOTE

Powering down to RESET mode will automatically disable all buck converters.

DCDC CONVERTER

(2 MHz)

DRV

CTRL

VBUCK

VFB

Isense

COUT

CNTRL

VDD (2.8 ... 5.0V)

SLEEP_EN

DAC

REF

POWER-EN

4.7uH

Figure 40: DC-DC buck converter

18.1 Converters BUCKCORE, BUCKPRO (DA9021 only) and BUCKMEM with

DVC

These converters are high efficiency, synchronous, step down regulators operating at a high

frequency (2 MHz) and supplying individual output voltages with ± 3% accuracy. Default output

voltage is loaded from OTP and can be set in 25 mV steps.

DVC allows the following features:

● The buck converter output voltage to be programmable over the power manager bus in 25 mV

steps.

● The output voltage ramp step size is 6.25 mV/µs while slewing. If the feedback signal is

configured to be READY this line is asserted while slewing.

● Output voltages below 0.725 V will only be supported in Pulse Frequency Modulation (PFM)

mode. During a voltage reduction below 0.725 V the slew rate control ends at 0.725 V and the

buck mode is automatically changed to sleep mode (with reduced maximum current capability).

The timing of voltage transitions between 0.5 V and 0.725 V depends on the load.

The DVC is handled by the following registers:

● Output voltage setting register VBCORE, VBPRO and VBMEM to configure the new target

voltage.

● Activate bit VB_CORE_GO, VB_PRO_GO and VB_MEM_GO will implement the changes at the

buck output (also used from the sequencer for deferred voltage changes). After being started

DA9021/22 will block (not accept any re-programming of) the related voltage setting registers

until slewing has been finished. If selected the READY signal will be asserted during ramping.

The supply current during PWM (synchronous rectification) operation is in the order of 2.2 mA

(quiescent current and charge/discharge current) and drops to <1µA in shutdown. Switching

frequency is chosen to be high enough to allow the use of a small 4.7 µH inductor.

DA9021 Datasheet(PDF) 88 Page - Dialog Semiconductor

DA9021 Datasheet(HTML) 88 Page - Dialog Semiconductor

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