MIC22400 datasheet(4/19 Pages) MICREL

Part #	MIC22400

Description	4A Integrated Switch Synchronous Buck Regulator with Frequency Programmable up to 4MHz

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Manufacturer	MICREL [Micrel Semiconductor]

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Micrel, Inc.

MIC22400

February 2008

4

M9999-022108-A

Absolute Maximum Ratings

(1)

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

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

Output Switch Current (ISW)..............................................6A

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

Storage Temperature (Ts) .........................–65°C to +150°C

ESD Rating

(3).................................................................. 2kV

Operating Ratings

(2)

Supply Voltage (VIN)......................................... 2.6V to 5.5V

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

Thermal Resistance

3x4 MLF-20 (

θJA) ...............................................45°C/W

e-TSSOP-20 (

θJA) ...........................................32.2°C/W

Electrical Characteristics

(4)

TA = 25°C with VIN = VEN = 3.3V; VOUT = 1.2V, COSC = 400pF, unless otherwise specified. Bold values indicate

–40°C< TJ < +125°C.

Parameter

Condition

Min

Typ

Max

Units

Supply Voltage Range

2.6

5.5

V

Under-Voltage Lockout Threshold

(turn-on)

2.4

2.5

2.6

V

UVLO Hysteresis

280

mV

Quiescent Current, PWM Mode

VEN =>1.34V; VFB = 0.9V (not switching)

1.3

2.0

mA

Shutdown Current

VEN = 0V

5

10

µA

[Adjustable] Feedback Voltage

± 1%

± 2% (over temperature)

0.693

0.686

0.7

0.707

0.714

V

Oscillator Current

320

400

480

µA

FB Pin Input Current

1

100

nA

Current Limit in PWM Mode

VFB = 0.5V

4.4

6

7.5

A

Output Voltage Line Regulation

VOUT 1.2V; VIN = 2.6 to 5.5V, ILOAD= 100mA

0.2

%

Output Voltage Load Regulation

100mA < ILOAD < 4000mA, VIN = 3.3V

0.2

%

Maximum Duty Cycle

VFB ≤ 0.5V

100

%

Switch ON-Resistance PFET

Switch ON-Resistance NFET

ISW = 1000mA; VFB=0.5V

ISW = 1000mA; VFB=0.9V

0.060

0.035

Ω

Oscillator Frequency

0.8

1

1.2

MHz

EN/DLY Threshold Voltage

1.14

1.24

1.34

V

EN/DLY Source Current

VIN = 2.6 to VIN = 5.5V

0.7

1

1.3

µA

RC Pin IRAMP

Ramp Control Current

0.7

1

1.3

µA

Power On Reset IPG(LEAK)

VPORH = 5.5V; POR = High

1

2

µA

Power On Reset VPG(LO)

Output Logic-Low Voltage (undervoltage condition),

IPOR = 5mA

135

mV

Threshold, % of VOUT below nominal

7.5

10

12.5

%

Power On Reset VPG

Hysteresis

2.7

%

Over-Temperature Shutdown

150

°C

Over-Temperature Shutdown

Hysteresis

10

°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. Devices are ESD sensitive. Handling precautions recommended.

4. Specification for packaged product only.

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