MAX608ESA 查看數據表（PDF） - Maxim Integrated

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MAX608ESA

5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller

Maxim Integrated 

5V or Adjustable, Low-Voltage,

Step-Up DC-DC Controller

VIN = 2V

C3

0.1µF

C2

0.1µF

2

OUT

5 REF

MAX608

4 SHDN

L1

22µH

C1

150µF

D1

1N5817

3 FB

6 AGND

GND

7

1

EXT

8

CS

N

MMFT3055EL

RSENSE

50mΩ

VOUT = 5V

@ 0.5A

C4

200µF

Figure 2a. 5V Preset Output

VIN = 2V

C3

0.1µF

C2

0.1µF

2

OUT

5 REF

4 SHDN MAX608

6 AGND

GND

7

( ) R2 = (R1) VOUT -1

VREF

VREF = 1.5V

L1

22µH

C1

150µF

D1

1N5817

VOUT = 12V

@ 0.3A

1

EXT

8

CS

3

FB

N

MMFT3055EL

C4

200µF

RSENSE

R2

50mΩ

402k

R1

58k

Figure 2b. 12V Output

_______________Detailed Description

The MAX608 is a BiCMOS, step-up, switch-mode pow-

er-supply controller that provides a preset 5V output, in

addition to adjustable-output operation. Its unique con-

trol scheme combines the advantages of pulse-frequen-

cy modulation (low supply current) and pulse-width

modulation (high efficiency with heavy loads), providing

high efficiency over a wide output current range, as well

as increased output current capability over previous

PFM devices. In addition, the external sense resistor

and power transistor allow the user to tailor the output

current capability for each application. Figure 1 shows

the MAX608 functional diagram. The device has a shut-

down mode that reduces the supply current to 5µA

max.

Figure 2 shows the standard application circuits. The

IC is powered from the output, and the input voltage

range is 1.8V to VOUT (this configuration is commonly

known as bootstrap operation). The voltage applied to

the gate of the external power transistor is switched

from VOUT to ground.

The MAX608’s output voltage can be set to 5V by con-

necting FB to ground; it can also be adjusted from 3V

to 16.5V using external resistors. Use 1% external feed-

back resistors when operating in adjustable-output

mode (Figures 2b, 2c) to achieve an overall output volt-

age accuracy of ±5%.

VIN = 2V

C3

0.1µF

C2

0.1µF

2

OUT

5 REF

4 SHDN MAX608

6 AGND

GND

7

( ) R2 = (R1) VOUT -1

VREF

VREF = 1.5V

L1

22µH

C1

150µF

D1

1N5817

1

EXT

8

CS

3

FB

N

SI6426

RSENSE

50mΩ

R1

50k

VOUT = 3.3V

@ 0.6A

C4

200µF

R2

60k

C5

47pF

Figure 2c. 3.3V Output

PFM Control Scheme

The MAX608 uses a proprietary current-limited PFM con-

trol scheme to provide high efficiency over a wide range

of load currents. This control scheme combines the ultra-

low supply current of PFM converters (or pulse skippers)

with the high full-load efficiency of PWM converters.

_______________________________________________________________________________________ 7

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