MAX863 datasheet(4/16 Pages) MAXIM

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Dual, High-Efficiency, PFM, Step-Up

DC-DC Controller

_______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

0.01

0.1

100

1000

EFFICIENCY vs. OUTPUT CURRENT

(VOUT1 = 12V, NON-BOOTSTRAPPED)

OUTPUT CURRENT (mA)

VOUT1 = 5.0V

A: VIN = 2.7V

B: VIN = 3.3V

C: VIN = 3.6V

D: VIN = 4.0V

E: VIN = 6.0V

3.5

1000

BOOTSTRAPPED-MODE MINIMUM

START-UP INPUT VOLTAGE

vs. OUTPUT CURRENT

0.5

1.0

1.5

2.0

2.5

3.0

OUTPUT CURRENT (mA)

100

VOUT1 = 3.3V

VOUT1 = 5V

VDD CURRENT

vs. VDD VOLTAGE

VDD VOLTAGE (V)

Cond: Single +5V

BOTH ON

CONVERTER 1 ON

CONVERTER 2 ON

LOAD-TRANSIENT RESPONSE

100

µs/div

VOUT1 = 3.3V, IOUT1 = 100mA TO 600mA

A: VOUT1, 100mV/div, 3.3V DC OFFSET

B: IOUT1, 200mA/div

RESPONSE ENTERING/

EXITING SHUTDOWN (BOOTSTRAPPED)

3.3V

200

µs/div

VOUT1 = 3.3V, IOUT1 = 100mA, VIN = 2.4V

A: SHDN1, 5V/div

B: INDUCTOR CURRENT, 2A/div

C: VOUT1, 3.3V OFFSET, 500mV/div

LINE-TRANSIENT RESPONSE

500

µs/div

VOUT1 = 5V, IOUT1 = 800mA

A: VIN = 2.7V TO 3.7V, 500mV/div

B: VOUT1, AC COUPLED, 50mV/div

C: INDUCTOR CURRENT, 2A/div

EXT RISE AND FALL TIMES vs.

SUPPLY VOLTAGE AND MOSFET CAPACITANCE

140

SUPPLY VOLTAGE (V)

120

100

C,1

C,2

B,1

B,2

A,1

A,2

Cond: Single 5V

A: 470pF

B: 1.0nF

C: 2.2nF

1: RISE

2: FALL

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