34727 datasheet(6/19 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

MC34727

ELECTRICAL CHARACTERISTICS

STATIC ELECTRICAL CHARACTERISTICS

Table 4. Static Electrical Characteristics

Characteristics noted under conditions; 2.7V

≤ VIN ≤ 5.5V, 0.8V ≤ VOUT ≤ 3.3V, -25oC ≤ TA ≤ 85oC, CIN = COUT = 4.7µF,

L1 = 4.7

µH (See Figure 1), unless otherwise noted. The typical specifications are measured at the following conditions;

TA = +25oC, VIN = 3.6V, fSW = 2.0MHz with the typical operating circuit (See Figure 1), unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

Supply Voltage

VIN

2.7

5.5

Output Voltage (Factory preset)

VOUT

0.8

3.3

Output Current

IOUT

600

Total Supply Current(5)

Regulator disabled

IDIS

0.1

1.0

µA

Quiescent Current (Switching)

Sleepy Z-mode and ILOAD = 0mA

µA

Current Limit

Current rising at high side

IPK

900

Output Voltage Accuracy (% of output voltage)

Over load and temperature

∆VOUT

-3%

VOUT

UVLO Threshold(6)

VIN: 2.7 -5.5V

VIN rising

VIN falling

VUVLO

2.5

2.7

Enable Voltage

Regulator operating

Regulator shutdown

VEN

1.6

0.4

High Side Power MOSFET On Resistance

VIN = 3.6V, VOUT = 1.8V, TA = 40°C, ILOAD = 150mA

RDS(ON)H

250

Ω

Low Side Power MOSFET On Resistance

VIN = 3.6V, VOUT = 1.8V, TA = 40°C, ILOAD = 150mA

RDS(ON)L

350

Ω

Load Regulation

1.0mA < ILOAD < 600mA and VOUT = 1.8V

∆VOUT/∆IOUT

0.5

Line Regulation

VIN = 2.7V to 5.5V

∆VOUT/∆VIN

0.5

Start-up Overshoot (% of output voltage)

ILOAD = 0mA, VOUT = 1.8V and COUT = 4.7µF

VSTO

VOUT

Thermal Shutdown Threshold (Junction Temperature)

TSTDN

140

°C

Thermal Shutdown Hysteresis (Junction Temperature)

THYSTR

°C

Notes

Maximum IDIS measured at VIN = 3.6V and TA = 25°C.

For a product with a VOUT of 3.3V and a VIN minimum less than 3.6V, the VOUT value will track (drop below 3.3V) VIN down to a value

of 2.5V, where the UVLO shutdown mechanism will activate.

34727 Datasheet(PDF) 6 Page - Freescale Semiconductor, Inc

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