34704 datasheet(13/54 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34704

ELECTRICAL CHARACTERISTICS

STATIC ELECTRICAL CHARACTERISTICS

REGULATOR 8

Output Voltage Range

VOUT

5.0(19)

Output Accuracy

-4.0

4.0

Feedback Reference Voltage

VFB

0.600(20)

Feedback Reference Voltage on current regulation mode

VFB

0.230(21)

Dynamic Voltage Scaling Range

VDYN

-10

Dynamic Voltage Scaling Step Size

VDYN_STEP

2.5

Line/Load Regulation(18)

REGLN/LD

-1.0

1.0

Continuous Output Current(18)

IOUT

Over-current Limit (Detected in low side FET)

ILIM_ION

1.0

Short-circuit Current Limit (Detected in the Blocking FET)

ISHORT_ION

1.5

Over-current Limit Accuracy

-20

N-CH Switch Power MOSFET RDS(ON)

RDS(ON)-SW

450

N-CH Synch. Power MOSFET RDS(ON)

RDS(ON)-SY

1000

N-CH Shutdown Power MOSFET RDS(ON)

RDS(ON)-SH

450

Discharge MOSFET RDS(ON)

RDS(ON)-DIS

Thermal Shutdown Threshold(18)

TSD

170

°C

Thermal Shutdown Hysteresis(18)

TSD-HYS

°C

SW8 Leakage Current (Off State) @25°C

ISW8_LKG

1.0

μA

Notes

18.

Guaranteed by Design

19.

When Battery voltage is higher than 5.0V and VOUT8 is 5.0V, a polarization diode is necessary to achieve accurate output voltage. See

Component Calculation on page 39 for further details.

20.

VFB is 0.6V when the part ist powered up and no DVS is changed. DVS is achieved by modifying VFB reference.

21.

When in Current regulation mode, the Voltage reference is set to 0.230mV to set the maximum current, and it is internally decreased to

achieve a factor of the maximum current passing through the LED string

Table 4. Static Electrical Characteristics (continued)

Characteristics noted under conditions 2.7 V

≤ VIN ≤ 5.5 V, -20°C ≤ TA ≤ 85°C, GND = 0 V, unless otherwise noted. Typical

values noted reflect the approximate parameter means at TA = 25°C under nominal conditions, unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

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