MC34708 datasheet(75/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

VGEN1 ACTIVE MODE – DC

VGEN1

Output Voltage VOUT

•VINMIN < VIN < VINMAX ILMIN < IL < ILMAX

VNOM – 3%

VNOM

VNOM + 3%

VGEN1LOPP Load Regulation

•1.0 mA < IL < ILMAX For any VINMIN < VIN < VINMAX

0.25

mV/mA

VGEN1LIPP Line Regulation

•VINMIN < VIN < VINMAX For any ILMIN < IL < ILMAX

5.0

VGEN1SCTH Short-circuit Protection threshold

•VINMIN < VIN < VINMAX Short-circuit VOUT to GND

ILMAX

+20%

IGEN1Q

Active Mode Quiescent Current

•VINMIN < VIN < VINMAX IL = 0

µA

VGEN1 LOW POWER MODE - DC

VGEN1

Output Voltage VOUT

•VINMIN < VIN < VINMAX ILMINLP < IL < ILMAXLP

VNOM - 3%

VNOM

VNOM + 3%

IGEN1

Current Load Range ILMINLP to ILMAXLP

0.0

3.0

IGEN1Q

Low Power Mode Quiescent Current

•VINMIN < VIN < VINMAX IL = 0

µA

VGEN1 ACTIVE MODE - AC

VGEN1PSRR PSRR

•IL = 75% of ILMAX 20 Hz to 20 kHz VGEN1[2:0] = 000-101

• IL = 75% of ILMAX 20 Hz to 20 kHz VGEN1[2:0] = 110-111

VGEN

1NOISE

Output Noise Density, VIN = VINMIN IL = 75% of ILMAX

• 100 Hz – 1.0 kHz

•> 1.0 kHz – 10 kHz

•> 10 kHz – 1.0 MHz

-115

-126

-132

V/Hz

VGEN

1SPURS

Spurs

• 32.768 kHz and harmonics

-100

tON-VGEN1 Turn-on Time

• Enable to 90% of end value VIN = VINMIN, VINMAX, IL = 0

1.0

tOFF-VGEN1 Turn-off Time

• Disable to 10% of initial value VIN = VINMIN, VINMAX, IL = 0

0.01

VGEN1OS-

START

Start-up Overshoot

•VIN = VINMIN, VINMAX, IL = 0

1.0

2.0

VGEN1LO

TRANSIENT

Transient Load Response

•VIN = VINMIN, VINMAX

1.0

2.0

VGEN1LI

TRANSIENT

Transient Line Response

•IL = 75% of ILMAX

5.0

8.0

Table 65. VGEN1 Electrical Specification

Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V, -40 C  TA  85 C, unless otherwise noted. Typical values

at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted.

Symbol

Characteristic

Min

Typ

Max

Unit

Notes

MC34708 数据表(PDF) 75 Page - Freescale Semiconductor, Inc

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