SABRE-LL-I datasheet(71/141 Pages) STMICROELECTRONICS

71 / 141 page

SABRE-LL-I

Power bridges

71/141

Simple buck regulator application

The battery charge loop control can be used to implement a buck type switching regulator.

The regulated output voltage will be externally set by a resistor divider network connected to

VREF_FB pin, as already described in voltage regulation section, and the current protection

will be the one implemented internally in the Bridge4 section.

Figure 21.

Simple buck regulator

When this control loop is intended to be used as a simple buck regulator, the proper

Aux3BatteryCharge bit must be written in the Aux3SwCfg1 register.

The regulator will also implement a soft start strategy.

When S.A.B.Re “Low Power mode” is enabled this regulator will be disabled.

Here after are summarized the primary features of the regulator:

–

Internal power switch.

–

Nonlinear pulse skipping control.

–

Internally generated PWM (250 KHz switching frequency).

–

Cycle by cycle current limiting using internal current sensor/ external current

sense differential amplifier.

–

Protected against load short circuit.

–

Soft start circuitry to limit inrush current flow from primary supply.

–

Under voltage signal (both continuous and latched) accessible through SPI.

–

Over temperature protection.

IREF_FB

VREF_FB

SABRE

COMP_I

COMP_V

PULSE SKIPPING

BURST

CONTROL LOGIC

PEAK CURRENT

MODE CONTROL

LOGIC

BRIDGE 4

PARALLELED

POWER

STAGE

SelFBRef<1:0>

DC4_plus

DC4_minus

SelCurrRef<1:0>

LOAD

FBRef

CurrRef

Ilimit

PWM

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