MIC4721 datasheet(3/19 Pages) MICREL

3 / 19 page

Micrel, Inc.

MIC4721

May 2007

M9999-052907-A

Absolute Maximum Ratings

(1)

Supply Voltage (VIN) .......................................................+6V

Output Switch Voltage (VSW) ..........................................+6V

Output Switch Current (ISW)............................................11A

Logic Input Voltage (VEN) .................................. –0.3V to VIN

Storage Temperature (Ts) .........................–60°C to +150°C

Operating Ratings

(2)

Supply Voltage (VIN)..................................... +2.7V to +5.5V

Logic Input Voltage (VEN) ....................................... 0V to VIN

Junction Temperature (TJ) ........................ –40°C to +125°C

Junction Thermal Resistance

MSOP-10L (

JA)............................................... 130°C/W

MSOP-10L (

JC) ................................................ 43°C/W

Electrical Characteristics

(3)

VIN = VEN = 3.6V; L = 1µH; COUT = 4.7µF; TA = 25°C, unless noted. Bold values indicate –40°C< TJ < +125°C.

Parameter

Condition

Min

Typ

Max

Units

Supply Voltage Range

2.7

5.5

Under-Voltage Lockout

Threshold

(turn-on)

2.45

2.55

2.65

UVLO Hysteresis

100

Quiescent Current

VFB = 0.9 * VNOM (not switching)

570

900

µA

Shutdown Current

VEN = 0V

µA

[Adjustable] Feedback

Voltage

± 2% (over temperature) I

LOAD = 100mA

0.98

1.02

FB pin input current

Current Limit in PWM Mode

VFB = 0.9 * VNOM

3.5

Output Voltage Line

Regulation

VOUT > 2V; VIN = VOUT+500mV to 5.5V; ILOAD= 100mA

VOUT < 2V; VIN = 2.7V to 5.5V; ILOAD= 100mA

0.07

Output Voltage Load

Regulation

20mA < ILOAD < 3A

0.2

Maximum Duty Cycle

VFB ≤ 0.4V

100

PWM Switch ON-

Resistance

ISW = 50mA; VFB = 0.7VFB_NOM (High Side Switch)

200

300

Ω

Oscillator Frequency

1.8

2.2

MHz

Enable Threshold

0.5

0.85

1.3

Enable Hysteresis

Enable Input Current

0.1

2.3

µA

Power Good Range

±7

±10

Power Good Resistance

IPGOOD = 500µA

145

250

Ω

Over-Temperature

Shutdown

160

°C

Over-Temperature

Hysteresis

°C

Notes:

1. Exceeding the absolute maximum rating may damage the device.

2. The device is not guaranteed to function outside its operating rating.

3. Specification for packaged product only.

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