MIC23451 datasheet(3/20 Pages) MICREL

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Micrel, Inc.

MIC23451

November 5, 2013

Revision 1.2

Absolute Maximum Ratings(1)

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

Sense (VSNS1, VSNS2, VSNS3). .................................−0.3 to 6V

Power Good (PG1, PG2, PG3) ............................−0.3 to 6V

Output Switch Voltage (VSW1, VSW2, VSW3)......... −0.3V to 6V

Enable Input Voltage (VEN1, VEN2, VEN3) ............−0.3V to VIN

Storage Temperature Range .................... −65°C to +150°C

ESD Rating(3)................................................. ESD Sensitive

Operating Ratings(2)

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

Enable Input Voltage (VEN1, VEN2, VEN3) ................. 0V to VIN

Output Voltage Range (VSNS1, VSNS2, VSNS3) ... +1V to +3.3V

Junction Voltage Range (TJ) ...............−40°C ≤ TJ ≤ +125°C

Thermal Resistance

26-Pin 4mm × 4mm QFN (θJA).........................+20°C/W

26-Pin 4mm × 4mm QFN (θJC) ........................+10°C/W

Electrical Characteristics(4)

TA = +25°C; VIN = VEN1, VEN2, VEN3 = 3.6V; L1 = L2 = L3 = 1µH; COUT1, COUT2, COUT3 = 4.7µF, unless otherwise specified.

Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.

Parameter

Condition

Min.

Typ.

Max.

Units

Supply Voltage Range

2.7

5.5

Undervoltage Lockout Threshold

Turn-On

2.45

2.55

2.65

Undervoltage Lockout Hysteresis

Quiescent Current

IOUT = 0mA, SNS > 1.2 × VOUTNOM

120

µA

Per Channel Shutdown Current

VEN1, VEN2, VEN3 = 0V; VIN = 5.5V

0.1

µA

Output Voltage Accuracy

VIN = 3.6V if VOUT(NOM) < 2.5V, ILOAD = 20mA

−

2.5

VIN = 4.5V if VOUT(NOM) ≥ 2.5V, ILOAD = 20mA

Feedback Voltage

(VFB1, VFB2, VFB3)

0.604

0.62

0.635

Peak Current Limit

IOUT1, IOUT2, IOUT3

SNS1, SNS2, SNS3 = 0.9 × VOUTNOM

2.2

4.1

Foldback Current Limit

2.3

Output Voltage Line Regulation

(VOUT1, VOUT2, VOUT3)

VIN = 3.6V to 5.5V if VOUTNOM1, 2, 3 < 2.5V, ILOAD = 20mA

0.3

%/V

VIN = 4.5V to 5.5V if VOUTNOM1, 2, 3 ≥ 2.5V, ILOAD = 20mA

Output Voltage Load Regulation

(VOUT1, VOUT2, VOUT3)

DCM: 20mA < ILOAD < 130mA, VIN = 3.6V if VOUTNOM < 2.5V

0.2

DCM: 20mA < ILOAD < 130mA, VIN = 5.0V if VOUTNOM > 2.5V

0.4

CCM: 200mA < ILOAD < 500mA, VIN = 3.6V if VOUTNOM < 2.5V

0.6

CCM: 200mA < ILOAD < 1A, VIN = 5.0V if VOUTNOM > 2.5V

0.3

PWM Switch ON-Resistance

(RSW1, RSW2, RSW3)

ISW1, ISW2, ISW3 = +100mA (PMOS)

0.217

Maximum Frequency

IOUT1, IOUT2, IOUT3 = 120mA

MHz

Soft-Start Time

VOUT1, VOUT2, VOUT3 = 90%

150

µs

Power Good Threshold

% of VNOM

Power Good Hysteresis

Power Good Pull Down

VSNS = 90% VNOM, IPG = 1mA

200

Notes:

1. Exceeding the absolute maximum ratings may damage the device.

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

3. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.

4. Specification for packaged product only.

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