MIC26901 datasheet(5/30 Pages) MICREL

Part #	MIC26901

Description	28V, 9A Hyper Speed Control??Synchronous DC/DC Buck Regulator

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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Micrel, Inc.

MIC26901

July 2011

5

M9999-071311-A

Electrical Characteristics

(5) (Continued)

PVIN = VIN = VEN = 12V, VBST – VSW = 5V; TA = 25°C, unless noted. Bold values indicate -40°C ≤ TJ ≤ +125°C.

Parameter

Condition

Min.

Typ.

Max.

Units

Soft-Start

Soft-Start time

5

ms

Short-Circuit Protection

Current-Limit Threshold

VFB = 0.8V, TJ = 25°C

12.5

15

20

A

Current-Limit Threshold

VFB = 0.8V, TJ = 125°C

11.25

15

20

A

Short-Circuit Current

VFB = 0V

4

A

Internal FETs

Top-MOSFET RDS (ON)

ISW = 3A

27

mΩ

Bottom-MOSFET RDS (ON)

ISW = 3A

10.5

mΩ

SW Leakage Current

VEN = 0V

60

µA

VIN Leakage Current

VEN = 0V

25

µA

Power Good (PG)

PG Threshold Voltage

Sweep VFB from Low to High

85

92

95

%VOUT

PG Hysteresis

Sweep VFB from High to Low

5.5

%VOUT

PG Delay Time

Sweep VFB from Low to High

100

µs

PG Low Voltage

Sweep VFB < 0.9 × VNOM, IPG = 1mA

70

200

mV

Thermal Protection

Over-Temperature Shutdown

TJ Rising

160

°C

Over-Temperature Shutdown

Hysteresis

15

°C

Notes:

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

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

3. The device is not guaranteed to function outside operating range.

4. PD(MAX) = (TJ(MAX) – TA)/ θJA, where θJA depends upon the printed circuit layout. A 5 square inch 4 layer, 0.62”, FR-4 PCB with 2oz finish copper weight

per layer is used for the

θJA.

5. Specification for packaged product only.

6. Measured in test mode.

7. The maximum duty-cycle is limited by the fixed mandatory off-time tOFF of typically 300ns.

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