MAX1710 Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX1710

High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs

Maxim Integrated 

High-Speed, Digitally Adjusted

Step-Down Controllers for Notebook CPUs

VBATT

4.5V TO 28V

+5V

BIAS SUPPLY

C5

R1

1µF

20Ω

C6

1µF

C1 3 x 10µF/30V

ON/OFF

CONTROL

LOW-NOISE

CONTROL

DAC

INPUTS

C4

1µF

C3

470pF

TO VCC

7

VCC

1

V+

15

VDD

22

BST

2 SHDN

21

SKIP

DH 24

20

D0

19 D1

18 D2

MAX1710 LX 23

MAX1711

MAX1712 DL 13

D2

CMPSH-3

C7

0.1µF

PANASONIC

Q1

ETQP6F2R0HFA

L1

2µH

Q2 D1

17 D3

16 D4**

PGND 14

8 TON

9 REF

FB 3

FBS 4

5 CC

GNDS 11

+5V

10 GND

R4

1k

R2

100k

12

ILIM OVP* PGOOD

POWER-GOOD

INDICATOR

6 16

C2

3 x 470µF

KEMET T510

VOUT

1.25V TO 2V AT 7A (MAX1710)

0.925V TO 2V AT 7A (MAX1711)

1.1V TO 1.85V AT 7A (MAX1712)

D3

(OPTIONAL OVP

REVERSE-POLARITY

CLAMP)

Q1 = IRF7807

Q2 = IRF7805

D1, D3 = MBRS130T3 (OPTIONAL)

C1 = SANYO OS-CON (30SC10M)

*MAX1710 ONLY

**MAX1711/MAX1712 ONLY

R3

(OPTIONAL)

Figure 1. Standard Application Circuit

rent-mode PWMs while also avoiding the problems

caused by widely varying switching frequencies in con-

ventional constant-on-time and constant-off-time PWM

schemes.

+5V Bias Supply (VCC and VDD)

The MAX1710/MAX1711/MAX1712 require an external

+5V bias supply in addition to the battery. Typically, this

+5V bias supply is the notebook’s 95% efficient 5V sys-

tem supply. Keeping the bias supply external to the IC

improves efficiency and eliminates the cost associated

with the +5V linear regulator that would otherwise be

needed to supply the PWM circuit and gate drivers. If

stand-alone capability is needed, the +5V supply can be

generated with an external linear regulator such as the

MAX1615.

The battery and +5V bias inputs can be tied together if

the input source is a fixed 4.5V to 5.5V supply. If the +5V

bias supply is powered up prior to the battery supply, the

enable signal (SHDN) must be delayed until the battery

voltage is present in order to ensure startup. The +5V

bias supply must provide VCC and gate-drive power, so

the maximum current drawn is:

10 ______________________________________________________________________________________

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