LTC3252 datasheet(2/12 Pages) LINER

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LTC3252

3252f

VIN to GND ................................................–0.3V to 6.0V

EN1, EN2, FB1, FB2 to GND .......... – 0.3V to (VIN + 0.3V)

IOUT1, IOUT2 (Note 3) ........................................... 400mA

Operating Ambient Temperature Range

(Note 2) .................................................. – 40

°C to 85°C

Storage Temperature Range ................. – 65

°C to 125°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

ORDER PART

NUMBER

DE PART

MARKING

Consult LTC Marketing for parts specified with wider operating temperature ranges.

3252

LTC3252EDE

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Notes 1, 6)

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, VOUT1 = VOUT2 = 1.5V, C1 = C2 = 1µF, Cin = COUT1 = COUT2 =

4.7

µF (all capacitors ceramic) unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

Min Operating Voltage

(Note 4)

2.7

Max Operating Voltage

5.5

IVIN

Operating Current,

IOUT = 0mA, VEN1 = VIN, VEN2 = VIN,

100

µA

Both Outputs Enabled

2.7V

≤ VIN ≤ 5.5V

Operating Current,

IOUT = 0mA, VEN1 = 0, VEN2 = VIN or VEN1 = VIN,

µA

One Output Enabled

VEN2 = 0, 2.7V ≤ VIN ≤ 5.5V

Shutdown Current

VM0 = 0V, VM1 = 0V, 2.7V ≤ VIN ≤ 5.5V

0.01

µA

VFB1, VFB2

Feedback Voltage

IOUT = 0mA, 2.7V ≤ VIN ≤ 5.5V

0.78

0.8

0.82

IOUT1

Output Current

VEN1 = VIN

250

IOUT2

Output Current

VEN2 = VIN

250

IFB

FB1, FB2 Input Current

VFB1 = VFB2 = 0.85V

–50

VRIPPLE

Output Ripple (OUT1 or OUT2)

IOUT = 250mA

mVP-P

Spread Spectrum Frequency Range

fMIN Switching Frequency

0.8

1.0

MHz

fMAX Switching Frequency

1.6

2.0

MHz

VIH

EN1, EN2 Input High Voltage

2.7V

≤ VIN ≤ 5.5V

1.2

0.8

VIL

EN1, EN2 Input Low Voltage

2.7V

≤ VIN ≤ 5.5V

0.8

0.4

IIH

EN1, EN2 Input High Current

EN1 = VIN, EN2 = VIN

–1

µA

IIL

EN1, EN2 Input Low Current

EN1 = 0V, EN2 = 0V

–1

µA

tON

Turn On Time

ROUT = 3Ω

0.8

OUT1, OUT2 Load Regulation (Referred to FB pin)

0.08

mV/mA

Line Regulation

≤ IOUT1 ≤ 250mA or 0 ≤ IOUT2 ≤ 250mA

0.2

%/V

ROL

Open Loop Output Impedance,

VIN = 3.0V, IOUT = 200mA, VFB = 0.74V (Note 5)

1.4

Ω

(OUT1 or OUT2)

EXPOSED PAD IS GROUND

(MUST BE SOLDERED TO PCB)

TJMAX = 125°C, θJA = 40°C/W, θJC = 4.3°C/W

FB2

EN2

C2+

OUT2

C2–

GND

FB1

EN1

VIN

C1+

OUT1

C1–

TOP VIEW

DE PACKAGE

12-LEAD (4mm

× 3mm) PLASTIC DFN

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