MIC3385 datasheet(3/15 Pages) MICREL

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Micrel, Inc.

MIC3385

November 2006

M9999-111006-A

Absolute Maximum Ratings(1)

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

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

Output Switch Current (ISW)..............................................2A

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

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

EDS Rating

(3).................................................................. 3kV

Operating Ratings(2)

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

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

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

Junction Thermal Resistance

3mm x 3.5mm MLF-14L (

θJA) ............................55°C/W

Electrical Characteristics(4)

VIN = VEN = VLOWQ =3.6V; L = 0.47µH; COUT = 10µF; 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, PWM

mode

VFB = 0.9 * VNOM (not switching)

690

900

µA

Quiescent Current, LDO

mode

VLOWQ = 0V;IOUT = 0mA

µA

Shutdown Current

VEN = 0V

0.01

µA

[Adjustable] Feedback

Voltage

± 1%

± 2% (over temperature)

0.99

0.98

1.01

1.02

FB pin input current

Current Limit in PWM Mode

VFB = 0.9 * VNOM

0.75

1.85

Output Voltage Line

Regulation

VOUT > 2V; VIN = VOUT+300mV to 5.5V; ILOAD= 100mA

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

0.13

Output Voltage Load

Regulation, PWM Mode

20mA < ILOAD < 300mA

0.2

0.5

Output Voltage Load

Regulation, LDO Mode

100µA < ILOAD < 50mA

VLOWQ = 0V

0.1

0.2

Maximum Duty Cycle

VFB ≤ 0.4V

100

PWM Switch

ON-Resistance

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

ISW = -50mA VFB = 1.1VFB_NOM (Low Side Switch)

0.4

Ω

Oscillator Frequency

7.2

8.8

MHz

LOWQ threshold voltage

0.5

0.85

1.3

LOWQ Input Current

0.1

µA

Enable Threshold

0.5

0.85

1.3

Enable Input Current

0.1

µA

LDO Dropout Voltage

IOUT = 50mA, Note 5

110

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