LTC3528 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC3528

1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm × 2mm DFN

Linear Technology 

1 2 3 4 5 6 7 8 9 10 Next

LTC3528/LTC3528B

TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted)

Burst Mode Threshold Current

vs VIN

60

VOUT = 5V

40

EXIT BURST

ENTER BURST

20

0

1

2

3

4

VIN (V)

3528 G11

Oscillator Frequency Change

vs Temperature

2

1

0

–1

–2

–3

–4

–50 –25

0 25 50 75

TEMPERATURE (ËšC)

100 125

3528 G14

Start-Up Voltage vs Temperature

850

800

750

Oscillator Frequency Change

vs VOUT

0.50

0.25

NORMALIZED TO VOUT = 3V

0

–0.25

–0.50

–0.75

–1.00

–1.25

–1.50

–1.75

–2.00

–2.25

1.5 2 2.5 3 3.5 4 4.5 5

VOUT (V)

3528 G12

RDS(ON) vs VOUT

450

400

350

300

PMOS

250

200

NMOS

150

100

1.5 2

2.5 3 3.5 4

VOUT (V)

4.5 5

3528 G13

RDS(ON) Change vs Temperature

40

VFB vs Temperature

1.200

30

1.199

20

10

1.198

0

1.197

–10

–20

–50 –25

0 25 50 75

TEMPERATURE (ËšC)

100 125

3528 G15

1.196

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3528 G16

Burst Mode Quiescent Current vs

VOUT (LTC3528)

13.5

VIN = 1.2V

12.5

Fixed Frequency VOUT Ripple and

Inductor Current Waveforms

VOUT

20mV/DIV

IL

200mA/DIV

700

650

600

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3528 G17

11.5

10.5

1

2

3

VOUT (V)

4

5

3528 G18

VIN = 1.2V

VOUT = 3.3V

COUT = 22µF

CFF = 33pF

IOUT = 100mA

2µs/DIV

3528 G19

3528fd

5

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