Rainbow Electronics MAX17031 - Manual (Page 13)

Detailed Description
The MAX17031 step-down controller is ideal for high-
voltage, low-power supplies for notebook computers.
Maxim’s Quick-PWM pulse-width modulator in the
MAX17031 is specifically designed for handling fast
load steps while maintaining a relatively constant oper-
ating frequency and inductor operating point over a
wide range of input voltages. The Quick-PWM architec-
ture circumvents the poor load-transient timing prob-
lems of fixed-frequency current-mode PWMs, while also
avoiding the problems caused by widely varying
switching frequencies in conventional constant-on-time
and constant-off-time PWM schemes. Figure 2 is the
functional diagram overview and Figure 3 is the Quick-
PWM core functional diagram
.
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
______________________________________________________________________________________ 13
COMPONENT
400kHz/300kHz
SMPS1: 5V AT 5A
SMPS2: 3.3V AT 8A
Input Voltage V IN = 7V to 24V
Input Capacitor
(C
IN )
4X 10µF, 25V
Taiyo Yuden TMK432BJ106KM
SMPS 1
Output Capacitor
(C
OUT1 )
2x 100µF, 6V, 35m
SANYO 6TPE100MAZB
Inductor
(L1) 4.3µH, 11.4m , 11A
Sumida CEP125U
High-Side MOSFET
(N
H1 )
Siliconix
Si4800BDY
23m
/30m 30V
Low-Side MOSFET
(N
L1 )
Siliconix
Si4812BDY
16.5m
/20m 30V
Current-Limit Resistor
(R
ILIM1 )
71k
SMPS 2
Output Capacitor
(C
OUT2 )
2x 150µF, 4V, 35m
SANYO 4TPE150MAZB
Inductor
(L2) 2.2µH, 5.4m , 14A
Sumida CEP125U
High-Side MOSFET
(N
H2
)
Siliconix
Si4684DY
9.2m
/11.5m, 30V
Low-Side MOSFET
(N
L2 )
Siliconix
Si4430BDY
4.8m
/6.0m, 30V
Current-Limit Resistor
(R
ILIM2 )
71k
Table 1. Component Selection for
Standard Applications
SUPPLIER WEBSITE
AVX Corp. www.avx.com
Central Semiconductor
Corp.
www.centralsemi.com
Fairchild Semiconductor www.fairchildsemi.com
International Rectifier www.irf.com
KEMET Corp. www.kemet.com
NEC/TOKIN America, Inc. www.nec-tokinamerica.com
Panasonic Corp.
www.panasonic.coml
Philips/nxp Semiconductor www.semiconductors.philips.com
Pulse Engineering www.pulseeng.com
Renesas Technology
Corp.
www.renesas.com
SANYO Electric Co., Ltd. www,sanyodevice.com
Sumida Corp. www.sumida.com
Taiyo Yuden www.t-yuden.com
TDK Corp. www.component.tdk.com
TOKO America, Inc. www.tokoam.com
Vishay (Dale, Siliconix) www.vishay.com
Würth Elektronik GmbH
& Co. KG
www.we-online.com
Table 2. Component Suppliers