MC34726AFCR2 查看數據表（PDF） - Freescale Semiconductor

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MC34726AFCR2

300mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode

Freescale Semiconductor 

ELECTRICAL CHARACTERISTICS

STATIC 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 = 4.7µH (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

Output Voltage (Factory preset)

Output Current

Total Supply Current(5)

Regulator disabled

Quiescent Current (Switching)

Sleepy Z-mode and ILOAD = 0mA

VIN

VOUT

IOUT

IDIS

IQ

2.7

-

5.5

V

0.8

-

3.3

V

300

-

-

mA

µA

-

0.1

1.0

µA

-

65

85

Current Limit

Current rising at high side

Output Voltage Accuracy (% of output voltage)

Over load and temperature

UVLO Threshold(6)

VIN: 2.7 -5.5V

VIN rising

VIN falling

IPK

∆VOUT

VUVLO

-

450

-3%

-

-

-

2.5

-

mA

-

VOUT

3%

V

2.7

-

Enable Voltage

Regulator operating

Regulator shutdown

High Side Power MOSFET On Resistance

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

VEN

1.6

-

V

-

-

-

0.4

RDS(ON)H

mΩ

-

250

-

Low Side Power MOSFET On Resistance

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

RDS(ON)L

mΩ

-

350

-

Load Regulation

1mA < ILOAD < 300mA 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

-

3%

-

Thermal Shutdown Threshold (Junction Temperature)

TSTDN

-

140

-

°C

Thermal Shutdown Hysteresis (Junction Temperature)

THYSTR

-

10

-

°C

Notes

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

6. 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.

34726

6

Analog Integrated Circuit Device Data

Freescale Semiconductor

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