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33702

3.0 A Switch-Mode Power Supply with Linear Regulator

Motorola => Freescale 

Freescale Semiconductor, Inc.

STATIC ELECTRICAL CHARACTERISTICS (continued)

Characteristics noted under conditions -40°C ≤ TJ ≤ 125°C unless otherwise noted. Input voltages VIN1 = VIN2 = 3.3 V using the typical

application circuit (see Figure 20) unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

ERROR AMPLIFIER (BUCK CONVERTER)

Input Impedance (Note 7)

RIN

–

500

–

kΩ

Output Impedance (Note 7)

ROUT

–

150

–

Ω

DC Open Loop Gain (Note 7)

AVOL

–

80

–

dB

Gain Bandwidth Product (Note 7)

GBW

–

35

–

MHz

Slew Rate (Note 7)

SR

–

200

–

V/µs

Output Voltage Swing – High Level

VIN1 > 3.3 V, IOEA = -1.0 mA (Note 7)

VEA_OH

V

–

2.0

–

Output Voltage Swing – Low Level

IOEA = -1.0 mA (Note 7)

VEA_OL

V

–

0.4

–

Slope Compensation Ramp (Note 7)

VSCRamp

–

0.6

–

V

OSCILLATOR

Oscillator Low Level Output Voltage (Pin CLKSYN), CLKSEL Open

VOSC_OL

–

–

0.4

V

Oscillator High Level Output Voltage (Pin CLKSYN), CLKSEL Open

VOSC_OH

3.0

–

–

V

Oscillator Input Voltage Threshold (Pin CLKSYN), CLKSEL Grounded

VOSC_IH

1.2

1.6

2.0

V

Oscillator Frequency Adjusting Reference Voltage (FREQ)

VFREQ

–

1.29

–

V

Oscillator Frequency Adjusting Resistor Range

RFREQ

100

–

200

kΩ

BOOST REGULATOR

Boost Regulator Output Voltage

IBST = 20 mA, VIN1 = VIN2 = 2.8 V to 6.0 V

VBST

V

7.5

8.0

8.5

Boost Regulator Start-Up Voltage

VIN_BSU

–

1.6

1.8

V

Boost Regulator Peak Current Limit (Power FET Peak Current)

IP_BD

0.75

1.0

1.5

A

Boost Regulator Power FET Valley Current Limit (Low Level)

IL_BD

450

600

800

mA

Boost Power FET RDS(ON)

IBD = 1.0 A, TA = 25°C

RDS(ON)

–

mΩ

150

400

Boost Regulator Recommended Output Capacitor

CBST

–

10

–

µF

Boost Regulator Recommended Output Capacitor Maximum ESR

ESRCBST

–

100

–

mΩ

Notes

7. Design information only. It is not production tested.

MOTOROLA ANALOG INTEGRATED CIFRCoUrITMDoErVeICEInDfAoTrAmation On This Product,

Go to: www.freescale.com

33702

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