MIC2155 datasheet(6/33 Pages) MICREL

6 / 33 page

Micrel, Inc.

MIC2155/2156

May 2009

M9999-052709-A

(408) 944-0800

Absolute Maximum Ratings

(1)

Supply Voltage (VIN 1,2) ................................... -0.3V to 15V

Bootstrapped Voltage (VBST) ...................................VIN + 6V

SS, FB1, RMVOUT, RMGND, AVDD, Sync, EA2+, FB2,

VOUT .................................................................... -0.3V to 6V

CS1, EN1, EN2 ................................................ -0.3V to 15V

Junction Temperature Range...............-40

°C ≤ TJ ≤ +125°C

Ambient Storage Temperature...................-65

°C to +150°C

ESD .................................................. 1500V machine model

100V human body model

Lead Temperature (soldering 10sec)......................... 260°C

Operating Ratings

(2)

Supply Voltage (VIN 1,2)............................. +4.5V to +14.5V

Output Voltage Range...................................... 0.7V to 3.6V

Package Thermal Resistance

5mm × 5mm MLF

® (θJA) ....................................50°C/W

5mm × 5mm MLF

® (θJC).......................................5°C/W

Electrical Characteristics

(3)

TJ = 25°C; VEN = VIN1 = VIN2 =12V; unless otherwise specified. Bold values indicate -40°C≤TJ≤+125°C

Parameter

Condition

Min

Typ

Max

Units

VIN , VDD and VREF Supply

Total Supply Current,

IVIN1 + IVIN2

PWM Mode Supply Current

VFB = 0.8V (both O/Ps)

(non-switching)

Shutdown Current

VEN1 = VEN2 = 0V

210

300

µA

CH1 VIN UVLO Start Voltage

VDD = open

3.6

4.4

CH1 VIN UVLO Stop Voltage

VDD = open

3.4

3.97

4.2

CH2 VIN UVLO Start Voltage

VDD = open

2.5

2.7

2.9

CH2 VIN UVLO Stop Voltage

VDD = open

2.3

2.5

2.7

VDD UVLO Start Voltage

VIN1 = VDD for VIN < 6V

3.6

VDD UVLO Stop Voltage

VIN1 = VDD for VIN < 6V

3.3

VIN UVLO Hysteresis

VDD = open

VEN Shutdown Threshold

(each Channel)

0.6

1.6

VEN Hysteresis

(each Channel)

Internal Bias Voltage (VDD)

IVDD = -75mA

IVDD = -50mA VIN = 6V

4.9

5.25

5.6

Oscillator / PWM Section

PWM Frequency

MIC2155

MIC2156

450

270

510

310

550

330

kHz

Sync range

Sync Input is 2x PWM Frequency

MIC2155

MIC2156

860

500

1200

680

kHz

Sync level

0.5

Maximum Duty Cycle (each

Channel)

Minimum Headroom

between VDD and VOUT

Required for remote sense amplifier use

1.3

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