MAX17014EVKIT+ Maxim Integrated Products, MAX17014EVKIT+ Datasheet - Page 17

• Manufacturer Part Number: MAX17014EVKIT+
• Description: KIT EVAL FOR MAX17014
• Manufacturer: Maxim Integrated Products

Specifications of MAX17014EVKIT+

• Main Purpose: Special Purpose DC/DC, LCD Supply
• Outputs And Type: 4, Non-Isolated
• Power - Output: 32.9W
• Voltage - Output: 3.3V, 16V, -6V, 35V
• Current - Output: 2A, 1.5A, 100mA, 50mA
• Voltage - Input: 10.8 ~ 13.2V
• Regulator Topology: Boost, Buck
• Frequency - Switching: 1.2MHz
• Board Type: Fully Populated
• Utilized Ic / Part: MAX17014
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The typical operating circuit (Figure 1) of the
MAX17014 is a complete power-supply system for TFT
LCD panels in monitors and TVs. The circuit generates
a +3.3V logic supply, a +16V source driver supply, a
+34.5V positive gate driver supply, and a -6V negative
gate driver supply from a 12V ±10% input supply.
Table 1 lists some selected components and Table 2
lists the contact information for component suppliers.
Table 1. Component List
Table 2. Component Suppliers
Fairchild Semiconductor
Sumida
TDK
Toshiba
DESIGNATION
C15, C16, C24
C1, C2, C3
D3, D4, D5
D1, D2
C5
L1
L2
SUPPLIER
Typical Operating Circuit
10μF ±20%, 16V X5R ceramic capacitors
(1206)
Taiyo Yuden EMK325BJ106MD
TDK C3225X7R1C106M
22μF ±10%, 6.3V X5R ceramic capacitor
(1206)
Taiyo Yuden JMK316BJ226KL
Murata GRM31CR60J226M
10μF ±20%, 25V X5R ceramic capacitors
(1210)
TDK C3225X5R1E106M
3A, 30V Schottky diodes (M-Flat)
Toshiba CMS02 (TE12L,Q)
Central Semiconductor
200mA, 100V dual ultra-fast diodes
(SOT23)
Fairchild MMBD4148SE (top mark D4)
Central Semiconductor CMPD1001S lead
free (top mark L21)
Low-profile 4.7μH, 3.5A inductor
(2mm height)
TOKO FDV0620-4R7M
Low-profile 2.4μH, 2.6A inductor
(1.8mm height)
TOKO 1124BS-2R4M (2.4μH)
Wurth 744052002 (2.5μH)
______________________________________________________________________________________
DESCRIPTION
408-822-2000
847-545-6700
847-803-6100
949-455-2000
PHONE
Power Supply for LCD TVs
Low-Cost Multiple-Output
The MAX17014 is a multiple-output power supply
designed primarily for TFT LCD panels used in moni-
tors and TVs. It contains a step-down switching regula-
tor to generate the logic supply rail, a step-up switching
regulator to generate the source driver supply, and two
charge-pump regulators to generate the gate driver
supplies. Each regulator features adjustable output
voltage, digital soft-start, and timer-delayed fault pro-
tection. Both the step-down and step-up regulators use
a fixed-frequency current-mode control architecture.
The two switching regulators are 180° out-of-phase to
minimize the input ripple. The internal oscillator offers
two pin-selectable frequency options (600kHz/1.2MHz),
allowing users to optimize their designs based on the
specific application requirements. The MAX17014
includes two high-performance operational amplifiers
designed to drive the LCD backplane (VCOM). The
amplifiers feature high output current (±150mA), fast
slew rate (100V/µs), wide bandwidth (20MHz), and rail-
to-rail inputs and outputs. In addition, the MAX17014
features a high-voltage switch-control block, an internal
5V linear regulator, a 1.25V reference output, well-
defined power-up and power-down sequences, and
thermal-overload protection. Figure 2 shows the
MAX17014 functional diagram.
The step-down regulator consists of an internal n-chan-
nel MOSFET with gate driver, a lossless current-sense
network, a current-limit comparator, and a PWM con-
troller block. The external power stage consists of a
Schottky diode rectifier, an inductor, and output capac-
itors. The output voltage is regulated by changing the
duty cycle of the n-channel MOSFET. A bootstrap cir-
cuit that uses a 0.1µF flying capacitor between LX2 and
BST provides the supply voltage for the high-side gate
driver. Although the MAX17014 also includes a 10Ω
(typ) low-side MOSFET, this switch is used to charge
the bootstrap capacitor during startup and maintains
fixed-frequency operation at light load and cannot be
used as a synchronous rectifier. An external Schottky
diode (D2 in Figure 1) is always required.
408-822-2102
847-545-6720
847-390-4405
949-859-3963
FAX
Detailed Description
www.fairchildsemi.com
www.sumida.com
www.component.tdk.com
www.toshiba.com/taec
Step-Down Regulator
WEBSITE
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