MIC2174 datasheet(3/24 Pages) MICREL

3 / 24 page

Micrel, Inc.

MIC2174

September 2009

M9999-090409-B

Absolute Maximum Ratings

(1)

IN, FB, EN to GND ........................................... -0.3V to +6V

BST to LX ......................................................... -0.3V to +6V

BST to GND ................................................... -0.3V to +46V

DH to LX.............................................-0.3V to (VBST + 0.3V)

DL, COMP to GND...............................-0.3V to (VIN + 0.3V)

HSD to GND..................................................... -0.3V to 42V

PGND to GND ............................................... -0.3V to +0.3V

Junction Temperature .............................................. +150°C

Storage Temperature (TS)..........................-65°C to +150°C

Lead Temperature (soldering, 10sec)........................ 260°C

Operating Ratings

(2)

Input Voltage (VIN).......................................... 3.0V to 5.5V

Supply Voltage (VHSD) ....................................... 3.0V to 40V

Operating Temperature Range ..................-40

°C to +125°C

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

Junction Thermal Resistance

MSOP (

θJA) ..................................................130.5°C/W

Continuous Power Dissipation (TA = 70°C) .......421mW

(derate 5.6mW/°C above 70°C)

Electrical Characteristics

(4)

VBST - VLX = 5V; TA = 25°C, unless noted. Bold values indicate -40°C ≤ TJ ≤ +125°C.

Parameter

Condition

Min

Typ

Max

Units

General

Operating Input Voltage (VIN)

(5)

3.0

5.5

HSD Voltage Range (VHSD)

3.0

Quiescent Supply Current

(VFB = 1.5V, output switching but excluding

external MOSFET gate current)

1.4

3.0

Standby Supply Current

VIN = VBST = 5.5V, VHSD = 40V, LX = unconnected,

EN = GND

(6)

0.8

Under-voltage Lockout Trip Level

2.4

2.7

UVLO Hysteresis

DC-DC Controller

Output-Voltage Adjust Range

(VOUT)

(7)

0.8

Error Amplifier

FB Regulation Voltage

0°C ≤ TJ ≤ 85°C

-1

FB Regulation Voltage

-40°C ≤ TJ ≤ 125°C

-2

FB Input Leakage Current

500

VFB = 0.8V

103

130

162

Current-Limit Threshold

VFB = 0V

Soft-Start

Soft-start Period

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. Human body model, 1.5k in series with 100pF.

4. Specification for packaged product only.

5. The application is fully functional at low IN (supply of the control section) if the external MOSFETs have enough low voltage VTH.

6. The current will come only from the internal 100kΩ pull-up resistor sitting on the EN Input and tied to IN.

7. The maximum VOUT value is limited by the Fixed TON estimator which obtains VOUT as a divided by 6 value (1/6).

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