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DA9313

High Efficiency Dual Cell Switched Capacitor Divider

Datasheet

Revision 3.0

07-Apr-2017

CFR0011-120-00

27 of 54

10.3 Power Voltage Converter

The high efficiency 2S to 1S power voltage converter (PVC) is capable of supplying multiple 1S

voltage rails with up to 10 A output current. The dual phase interleaved operation ensures an almost

constant input current, thereby highly improving the application design against noise.

10.3.1

PVC Output Voltage

The PVC can be configured via OTP or I

2C and outputs a non-regulated voltage which is nominally

half of the input voltage, in the case where no load is applied. When a current (IOUT) is drawn at the

VOUT node and the PVC is switching at frequency of fSW_PVC, the output voltage is determined as:

OUT







Where:

● R

EQ is a function of the sum of all resistances in the input/output power path (including the power

device

’s on-resistance and the PCB routing resistance) as well as the switching frequency, C

FLY

and PCB parasitics.

● R

S is the sum of all resistances in the input/output power path (including the power devices on-

resistance and the PCB routing resistance).

● The switching frequency of the PVC, f

SW_PVC = 500 kHz. This has been pre-selected for optimized

and efficient operation.

The voltage ripple at VOUT can be first order approximated as the voltage drop due to the discharge of

the CFLY capacitor in half of the period at an fSW_PVC switching frequency, plus the discharge voltage

of the output VOUT capacitor during a typical 30 ns short dead time for phase switch. In addition, the

PVC provides an optional hardware enable/disable via selectable GPI, configured via the PVC_EN

10.3.2

PVC Start-Up

The PVC can be OTP configured to enable on entry to ACTIVE mode and to run in automatic (mixed

DCM and CCM based on load sensing) or in fixed frequency (CCM). Alternatively the PVC can be

set to CCM in ACTIVE mode and to run in automatic in SLEEP mode. See section 10.3.3.

During PVC start-up, the PVC does not switch and the flying capacitors CFLY are connected in

parallel to the output capacitor CLOAD. An internal current source charges the capacitors up to a

voltage value close to the target average in normal operation. The internal current source can be

configured from 500 mA to 2 A via I_STUP_PVC.

At the end of the start-up phase the normal switching operation of the PVC is restored.

NOTE

A start-up phase with an output load greater than I_STUP_PVC will not be successful. The PVC has a ramp-up

timer which checks the ramp-up happens in approx. 20 ms. If the output voltage has not reached a value close

to VDD/2 at this time this indicates a failure condition and the regular switching is not started. This is reported as

PVC_RAMPUP in FAULT_LOG.

CAUTION

To avoid damage to the device, the PVC output must reach VDD/2 – 80 mV before a load greater than half of

I_STUP_PVC can be applied to its output.

DA9313 Datasheet(PDF) 27 Page - Dialog Semiconductor

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