MIC2245 データシートの表示（PDF） - Micrel

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MIC2245

4MHz PWM Synchronous Buck Regulator with LDO Standby Mode

Micrel 

Micrel, Inc.

MIC2245

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

ESD 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

3x3 MLF-10L (θJA)................................... 60°C/W

Electrical Characteristics(4)

VIN = VEN = VLOWQ =3.6V; L = 1.0µH; 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

V

Under-Voltage Lockout

Threshold

(turn-on)

2.45 2.55 2.65

V

UVLO Hysteresis

100

mV

Quiescent Current, PWM

mode

VFB = 0.9 * VNOM (not switching)

710

900

µA

Quiescent Current, LDO

mode

VLOWQ = 0V;IOUT = 0mA

20

29

µA

Shutdown Current

[Adjustable] Feedback

Voltage

VEN = 0V

± 2% (over temperature)

0.01

5

µA

0.98

1

1.02

V

FB pin input current

1

nA

Current Limit in PWM Mode VFB = 0.9 * VNOM

0.675

1

1.85

A

Output Voltage Line

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

0.13

%

Regulation

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

Output Voltage Load

Regulation, PWM Mode

20mA < ILOAD < 300mA

0.2

0.8

%

Output Voltage Load

Regulation, LDO Mode

100µA < ILOAD < 50mA

VLOWQ = 0V

0.5

1

%

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

0.4

Oscillator Frequency

3.6

4

4.4

MHz

LOWQ threshold voltage

0.5

0.85

1.3

V

LOWQ Input Current

Enable Threshold

Enable Input Current

LDO Dropout Voltage

IOUT = 50mA Note 5

0.1

2

µA

0.5

0.85

1.3

V

0.1

2

µA

110

mV

January 2006

3

M9999-012406

www.micrel.com

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