MAX1715EEI(2000) データシートの表示（PDF） - Maxim Integrated

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MAX1715EEI
(Rev.:2000)

Ultra-High Efficiency, Dual Step-Down Controller for Notebook Computers

Maxim Integrated 

Ultra-High Efficiency, Dual Step-Down

Controller for Notebook Computers

Table 1. Component Selection for Standard Applications

COMPONENT

2.5V at 4A

Input Range

7V to 20V

Frequency

255kHz

Fairchild

Q1 High-Side MOSFET Semiconductor

1/2 FDS6982A

Fairchild

Q2 Low-Side MOSFET Semiconductor

1/2 FDS6982A

1.8V at 4A

7V to 20V

345kHz

Fairchild

Semiconductor

1/2 FDS6982A

Fairchild

Semiconductor

1/2 FDS6982A

5V at 3A

7V to 20V

255kHz

Fairchild

Semiconductor

1/2 FDS6990A

Fairchild

Semiconductor

1/2 FDS6990A

D2 Rectifier

Nihon EP10QY03 Nihon EP10QY03 Nihon EP10QY03

L1 Inductor

C1 Input Capacitor

C2 Output Capacitor

4.4µH

3.1µH

6.8µH

Sumida CDRH125 Sumida CDRH125 Coiltronics UP2B

10µF, 25V

Taiyo Yuden

TMK432BJ106KM

10µF, 25V

Taiyo Yuden

TMK432BJ106KM

10µF, 25V

Taiyo Yuden

TMK432BJ106KM

470µF, 4V Sanyo

POSCAP 4TPB470M

470µF, 4V Sanyo

POSCAP 4TPB470M

330µF, 6V AVX

TPSV337M006R

0060

1.3V at 8A

7V to 20V

255kHz

3.3V at 1.5A

4.75V to 5.5V

600kHz

International

Rectifier IRF7811

International Rectifier

1/2 IRF7301

Fairchild

Semiconductor

FDS6670A

International Rectifier

1/2 IRF7301

Motorola

MBRS340T3

—

1.5µH Sumida

CEP125-1R5MC

3.3µH

TOKO D73LC

(2) 10µF, 25V

Taiyo Yuden

TMK432BJ106KM

100µF, 10V

Sanyo POSCAP

10TPA100M

(2) 470µF, 6V Kemet 100µF, 10V

T510X477108M0 Sanyo POSCAP

06AS

10TPA100M

Table 2. Component Suppliers

MANUFACTURER

USA PHONE

FACTORY FAX

[Country Code]

AVX

803-946-0690 [1] 803-626-3123

Central Semiconductor 516-435-1110 [1] 516-435-1824

Coilcraft

847-639-6400 [1] 847-639-1469

Coiltronics

561-241-7876 [1] 561-241-9339

Fairchild Semiconductor 408-822-2181 [1] 408-721-1635

International Rectifier

Kemet

310-322-3331 [1] 310-322-3332

408-986-0424 [1] 408-986-1442

Matsuo

714-969-2491 [1] 714-960-6492

Motorola

602-303-5454 [1] 602-994-6430

Murata

814-237-1431

800-831-9172

[1] 814-238-0490

NIEC (Nihon)

Sanyo

805-867-2555* [81] 3-3494-7414

619-661-6835 [81] 7-2070-1174

Siliconix

408-988-8000

800-554-5565

[1] 408-970-3950

Sprague

603-224-1961 [1] 603-224-1430

Sumida

Taiyo Yuden

TDK

TOKO

847-956-0666

408-573-4150

847-390-4461

800-PIK-TOKO

[81] 3-3607-5144

[1] 408-573-4159

[1] 847-390-4405

[1] 708-699-1194

*Distributor

The power input and +5V bias inputs can be connected

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 (ON1, ON2) must

be delayed until the battery voltage is present to ensure

start-up. The +5V bias supply must provide VCC and

gate-drive power, so the maximum current drawn is:

IBIAS = ICC + f (QG1 + QG2) = 5mA to 30mA (typ)

where ICC is 1mA typical, f is the switching frequency,

and QG1 and QG2 are the MOSFET data sheet total

gate-charge specification limits at VGS = 5V.

Free-Running, Constant-On-Time PWM

Controller with Input Feed-Forward

The Quick-PWM control architecture is a pseudo-fixed-

frequency, constant-on-time current-mode type with

voltage feed-forward (Figure 3). This architecture relies

on the output filter capacitor’s ESR to act as the cur-

rent-sense resistor, so the output ripple voltage pro-

vides the PWM ramp signal. The control algorithm is

simple: the high-side switch on-time is determined sole-

ly by a one-shot whose period is inversely proportional

to input voltage and directly proportional to output volt-

age. Another one-shot sets a minimum off-time (400ns

typ). The on-time one-shot is triggered if the error com-

parator is low, the low-side switch current is below the

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