MAX8792 Maxim Integrated Products, MAX8792 Datasheet - Page 12

• Manufacturer Part Number: MAX8792
• Description: Single Quick-PWM Step-Down Controller
• Manufacturer: Maxim Integrated Products

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Table 1. Component Selection for Standard Applications
Table 2. Component Suppliers
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.
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
12
AVX
BI Technologies
Central
Semiconductor
Coiltronics
Fairchild
Semiconductor
International Rectifier
Kemet
NEC Tokin
MANUFACTURER
High-Side MOSFET
Low-Side MOSFET
Output Capacitor
______________________________________________________________________________________
Input Capacitor
COMPONENT
Inductor
Detailed Description
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
Taiyo Yuden TMK432BJ106KM
V
Panasonic EEFSX0D331XR
8.6mΩ/11.4mΩ (typ/max)
OUT
4.2mΩ/5.0mΩ (typ/max)
TON = 200kΩ (300kHz)
Fairchild (1x) FDS8690
Fairchild (1x) FDS8670
Wurth 744 3552 100
(2x) 330µF, 6mΩ
V
= 1.5V/1.05V AT 10A
1.0µH, 3.25mΩ
(2x) 10µF, 25V
IN
WEBSITE
(Figure 1)
= 7V to 20V
Taiyo Yuden TMK432BJ106KM
N
N
NEC-Tokin MPLC1040L3R3
H
L
TON = 332kΩ (300kHz)
Siliconix (1x) Si4916DY
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:
= 15mΩ/18mΩ (typ/max)
= 18mΩ/22mΩ (typ/max)
V
Panasonic
Pulse
Renesas
Sanyo
Siliconix (Vishay)
Sumida
Taiyo Yuden
TDK
TOKO
Wurth
Sanyo 4TPE330MI
(1x) 330µF, 18mΩ
OUT
MANUFACTURER
V
(2x) 10µF, 25V
3.3µH, 14mΩ
IN
(Figure 4)
= 7V to 20V
= 3.3V AT 6A
I
BIAS
= I
Q
+ f
SW
+5V Bias Supply (V
www.panasonic.com
www.pulseeng.com
www.renesas.com
www.secc.co.jp
www.vishay.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
www.we-online.com
Q
G
Taiyo Yuden TMK432BJ106KM
= 2mA to 20mA (typ)
V
Nec-Tokin PSGD0E337M7
8.6mΩ/11.4mΩ (typ/max)
OUT
4.2mΩ/5.0mΩ (typ/max)
TON = 100kΩ (600kHz)
Fairchild (1x) FDS8690
Fairchild (1x) FDS8670
Coiltronics FP3-R68
(2x) 330µF, 7mΩ
V
0.68µH, 4.6mΩ
= 1.5V/1.05V AT 10A
WEBSITE
(2x) 10µF 25V
IN
(Figure 7)
= 4V to 12V
CC
/V
DD
)