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,
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