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34710

Adjustable Dual Output Switching Power Supply

Motorola => Freescale 

Freescale Semiconductor, Inc.

Vb Charge Pump

The high-side MOSFETs in the H-Bridge motor drivers and

voltage regulators switch require a gate voltage in excess of

VB+, which is provided by the Vb supply. The Vb regulator is a

charge pump, switching directly off the VB+ supply, and uses an

internal oscillator operating at 200 kHz.

Internal Oscillator

The internal oscillator provides timing for the charge pump

and switching regulators.

APPLICATIONS

Power Dissipation

The power budget is described in Table 2. The maximum

dissipation for this device is 1.0 W continuous.

Table 2. Power Budget

Functional Block

Watt

Bias

0.00

Charge Pump

0.15

Switching Regulator

0.45

Linear Regulator

0.35

Total

0.95

MOTOROLA ANALOG INTEGRATED CIRFCoUrITMDoErVeICEInDfAoTrAmation On This Product,

Go to: www.freescale.com

34710

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