MIC3289 datasheet(4/16 Pages) MICREL

4 / 16 page

Micrel, Inc.

MIC3289

June 2007

M9999-061807

(408) 944-0800

Absolute Maximum Ratings

(1)

Supply voltage (VIN) .....................................................7.5V

Switch voltage (VSW) ..................................... –0.3V to 27V

Digital Control Voltage (VDC).............................. –0.3 to VIN

FB Voltage (VFB) .............................................................6V

Switch Current (ISW) ........................................................2A

Ambient Storage Temperature (TS) .........–65

°C to +150°C

ESD Rating, Note 3 ..................................................... 2KV

Operating Ratings

(2)

Supply Voltage (VIN) …………………..…… ..... 2.5V to 6.5V

Output Voltage (VOUT) …………….…................(VIN to VOVP)

Junction Temperature Range (TJ) ……......-40

°C to +125°C

Package Thermal Impedance

θJA 2mm × 2mm MLF

®-8L ..................................93°C/W

θJA TSOT23-6 ..................................................235°C/W

Electrical Characteristics

(4)

TA=25

oC, V

IN = 3.6V, VOUT = 10V, IOUT = 20mA, unless otherwise noted. Bold values indicate -40

°C ≤ TJ ≤ 125°C.

Symbol

Parameter

Condition

Min

Typ

Max

Units

VIN

Supply Voltage Range

2.5

6.5

VUVLO

Under-voltage Lockout

1.8

2.1

2.4

IVIN

Quiescent Current

VFB >500mV

1.4

ISD

Shutdown Current (DC pin

low )

VDC = 0V for > 2ms.

0.01

µA

VFB

Feedback Voltage

(+/-5%)

237

250

263

IFB

Feedback Input Current

VFB = 250mV

450

Line Regulation

2.5V

≤ VIN ≤ 4.5V

0.5

Load Regulation

5mA

≤ IOUT ≤ 20mA

0.5

DMAX

Maximum Duty Cycle

ISW

Switch Current Limit

VIN = 3.6V

500

750

1200

VDC

DC pin thresholds

High

Low

1.1

0.4

DC Pin Hysteresis

IDC

DC Pin Current

VDC = 3.6V

µA

tshutdown

Shutdown Pulse Width

VIN = 2.8V to 5.5V

VDC = Low

1260

µs

tMODE_UP

Count UP mode pulse width

VIN = 2.8V to 5.5V

VDC = Low

100

160

µs

tMODE_DO

Count Down mode pulse

width

VIN = 2.8V to 5.5V

VDC = Low

420

500

µs

tstart_up

Turn-on Delay Time

VIN = 2.8V to 5.5V

140

µs

tprog_low

Programming pulse width

low

VIN = 2.8V to 5.5V

µs

tprog_high

Programming pulse width

high

VIN = 2.8V to 5.5V

µs

tdelay

Minimum Delay for mode

change

VIN = 2.8V to 5.5V

VDC = High

140

µs

Tprog_setup

First Pulse Window for

Preprogramming

VIN = 2.8V to 5.5V

µs

fSW

Oscillator Frequency

1.2

1.35

MHz

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