MAX8792 查看數據表（PDF） - Maxim Integrated

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MAX8792

Single Quick-PWM Step-Down Controller with Dynamic REFIN

Maxim Integrated 

Single Quick-PWM Step-Down

Controller with Dynamic REFIN

Table 1. Component Selection for Standard Applications

COMPONENT

Input Capacitor

Output Capacitor

Inductor

High-Side MOSFET

Low-Side MOSFET

VOUT = 1.5V/1.05V AT 10A

(Figure 1)

VIN = 7V to 20V

RTON = 200kΩ (300kHz)

(2x) 10μF, 25V

Taiyo Yuden TMK432BJ106KM

(2x) 330μF, 6mΩ

Panasonic EEFSX0D331XR

1.0μH, 3.25mΩ

Würth 744 3552 100

Fairchild (1x) FDS8690

8.6mΩ/11.4mΩ (typ/max)

Fairchild (1x) FDS8670

4.2mΩ/5.0mΩ (typ/max)

VOUT = 3.3V AT 5A

(Figure 4)

VIN = 7V to 20V

RTON = 332kΩ (300kHz)

(2x) 10μF, 25V

Taiyo Yuden TMK432BJ106KM

(1x) 330μF, 18mΩ

SANYO 4TPE330MI

3.3μH, 14mΩ

NEC-TOKIN MPLC1040L3R3

Siliconix (1x) Si4916DY

NH = 18mΩ/22mΩ (typ/max)

NL = 15mΩ/18mΩ (typ/max)

VOUT = 1.5V AT 10A/1.05V AT

7A (Figure 7)

VIN = 4V to 12V

RTON = 100kΩ (600kHz)

(2x) 10μF, 25V

Taiyo Yuden TMK432BJ106KM

(2x) 330μF, 7mΩ

NEC-TOKIN PSGD0E337M7

0.68μH, 4.6mΩ

Coiltronics FP3-R68

Fairchild (1x) FDS8690

8.6mΩ/11.4mΩ (typ/max)

Fairchild (1x) FDS8670

4.2mΩ/5.0mΩ (typ/max)

Table 2. Component Suppliers

MANUFACTURER

AVX Corp.

BI Technologies

Central

Semiconductor Corp.

Coiltronics

Fairchild

Semiconductor

International Rectifier

KEMET Corp.

NEC TOKIN America,

Inc.

Panasonic Corp.

WEBSITE

www.avxcorp.com

www.bitechnologies.com

www.centralsemi.com

www.cooperet.com

www.fairchildsemi.com

www.irf.com

www.kemet.com

www.nec-tokin.com

www.panasonic.com

MANUFACTURER

Pulse Engineering

Renesas Technology

Corp.

SANYO Electric Co.,

Ltd.

Siliconix (Vishay)

Sumida Corp.

Taiyo Yuden

TDK Corp.

TOKO America, Inc.

Würth Electronik

GmbH & Co. KG

WEBSITE

www.pulseeng.com

www.renesas.com

www.sanyo.com

www.vishay.com

www.sumida.com

www.t-yuden.com

www.component.tdk.com

www.tokoam.com

www.we-online.com

Detailed Description

The MAX8792 step-down controller is ideal for the low-

duty-cycle (high-input voltage to low-output voltage)

applications required by notebook computers. Maxim’s

proprietary Quick-PWM pulse-width modulator in the

MAX8792 is specifically designed for handling fast load

steps while maintaining a relatively constant operating

frequency and inductor operating point over a wide

range of input voltages. The Quick-PWM architecture

circumvents the poor load-transient timing problems of

fixed-frequency, current-mode PWMs while also avoid-

ing the problems caused by widely varying switching

frequencies in conventional constant-on-time (regard-

less of input voltage) PFM control schemes.

+5V Bias Supply (VCC/VDD)

The MAX8792 requires an external 5V bias supply in

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

the notebook’s main 95% efficient 5V system 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 5V bias supply powers both the PWM controller

and internal gate-drive power, so the maximum current

drawn is determined by:

IBIAS = IQ + fSWQG = 2mA to 20mA (typ)

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