MIC2570 datasheet(3/15 Pages) MIC

3 / 15 page

August 2007

MIC2570

Micrel, Inc.

Electrical Characteristics

VIN = 2.5V; TA = 25°C, bold indicates –40°C ≤ TA ≤ 85°C; unless noted

Parameter

Condition

Min

Typ

Max

Units

Input Voltage

Startup guaranteed, ISW = 100mA

1.3

Quiescent Current

Output switch off

130

µA

Fixed Feedback Voltage

MIC2570-1; V2.85V pin = VOUT, ISW = 100mA

2.7

2.85

3.0

MIC2570-1; V3.3V pin = VOUT, ISW = 100mA

3.14

3.30

3.47

MIC2570-1; V5V pin = VOUT, ISW = 100mA

4.75

5.00

5.25

Reference Voltage

MIC2570-2, [adj. voltage versions], ISW = 100mA, Note 1

208

220

232

Comparator Hysteresis

MIC2570-2, [adj. voltage versions]

Output Hysteresis

MIC2570-1; V2.85V pin = VOUT, ISW = 100mA

MIC2570-1; V3.3V pin = VOUT, ISW = 100mA

MIC2570-1; V5V pin = VOUT, ISW = 100mA

120

Feedback Current

MIC2570-1; V2.85V pin = VOUT

µA

MIC2570-1; V3.3V pin = VOUT

µA

MIC2570-1; V5V pin = VOUT

µA

MIC2570-2 [adj. voltage versions]; VFB = 0V

Reference Line Regulation

1.5V ≤ VIN ≤ 15V

0.35

%/V

Switch Saturation Voltage

VIN = 1.3V, ISW = 300mA

250

VIN = 1.5V, ISW = 800mA

450

VIN = 3.0V, ISW = 800mA

450

Switch Leakage Current

Output switch off, VSW = 36V

µA

Oscillator Frequency

MIC2570-1, -2; ISW = 100mA

kHz

Maximum Output Voltage

Sync Threshold Voltage

0.7

Switch On-Time

µs

Currrent Limit

1.1

Duty Cycle

VFB < VREF, ISW = 100mA

General Note: Devices are ESD protected; however, handling precautions are recommended.

Note 1: Measured using comparator trip point.

Absolute Maximum Ratings

Supply Voltage (VIN)......................................................18V

Switch Voltage (VSW) ....................................................36V

Switch Current (ISW)........................................................ 1A

Sync Voltage (VSYNC)......................................–0.3V to 15V

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

SOIC Power Dissipation (PD)..................................400mW

Operating Ratings

Supply Voltage (VIN)..................................... +1.3V to +15V

Ambient Operating Temperature (TA) ......... –40°C to +85°C

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

SOIC Thermal Resistance (θJA) ............................140°C/W

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