MIC4950 datasheet(3/18 Pages) MICREL

3 / 18 page

Micrel, Inc.

MIC4950

March 20, 2014

Revision 1.1

Absolute Maximum Ratings

(3)

PVIN, AVIN Supply Voltage (VIN) ...................... –0.3V to 6V

SW Output Switch Voltage (VSW) ...................... –0.3V to VIN

EN, PG (VEN, VPG) ............................................. –0.3V to VIN

FB Feedback Input Voltage (VFB)...................... –0.3V to VIN

Storage Temperature Range ....................

–65°C to +150°C

ESD Rating

(5)........................................................ 2kV, HBM

Operating Ratings

(4)

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

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

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

Thermal Resistance

SOIC-8 (



JA) ..................................................... 120°C/W

DFN-10 (



JA) ...................................................... 35°C/W

Electrical Characteristics

(6)

VIN = VEN = 3.3V; L = 1.0µH; CIN = 10µF; COUT = 10µF; TA = 25°C, bold values indicate –40°C≤ TJ ≤ +125°C, unless noted.

Symbol

Parameter

Condition

Min.

Typ.

Max.

Units

VIN

Supply Voltage Range

2.7

5.5

VUVLO

Under-Voltage Lockout

Threshold

Turn-On

2.41

2.5

2.61

VUVLOH

Under-Voltage Lockout

Hysteresis

400

Quiescent Current

IOUT = 0mA , FB > 1.2*VFB (Nominal)

0.8

ISD

Shutdown Current

VEN = 0V

0.01

µA

VFB

Feedback Voltage

0.609

0.625

0.64

ILIMIT

Current Limit

FB = 0.9*VFB (Nominal)

5.5

7.5

LINEREG

Output Voltage Line

Regulation

VIN = 2.7 to 3.5V, VOUTNOM = 1.8V, ILOAD = 20mA

%/V

VIN = 4.5V to 5.5V if VOUTNOM ≥ 2.5V, ILOAD =

20mA

LOADREG

Output Voltage Load

Regulation

20mA < ILOAD < 500mA,

VIN = 3.6V if VOUTNOM < 2.5V

0.3

20mA < ILOAD < 500mA,

VIN = 5.0V if VOUTNOM ≥ 2.5V

20mA < ILOAD < 5A, VIN = 3.6V if VOUTNOM < 2.5V

20mA < ILOAD < 5A, VIN = 5.0V if VOUTNOM ≥ 2.5V

RDSON-P

PWM Switch ON-Resistance

ISW = 1A P-Channel MOSFET

RDSON-N

ISW = –1A N-Channel MOSFET

tON

Maximum Turn-On Time

VIN = 4.5V, VFB = 0.5V

665

VIN = 3.0V, VFB = 0.5V

1000

VIN = 2.7V, VFB = 0.5V

1120

tOFF

Minimum Turn-Off Time

VIN = 3.0V, VFB = 0.5V

176

tSOFT-ON

Soft Start Time

VOUT = 90% of VOUTNOM

500

µs

VEN

Enable Threshold

Turn-On

0.5

0.8

1.2

Notes:

Exceeding the absolute maximum ratings may damage the device.

The device is not guaranteed to function outside its operating ratings.

Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5k

Ω in series with 100pF.

Specification for packaged product only.

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