MAX17075ETG+ Maxim Integrated Products, MAX17075ETG+ Datasheet - Page 13

• Manufacturer Part Number: MAX17075ETG+
• Description: IC DC-DC CONV W/CHRG PUMP 24TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX17075ETG+

• Applications: LCD TV/Monitor
• Current - Supply: 4mA
• Voltage - Supply: 2.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 2. Component Suppliers
The main step-up regulator employs a current-mode,
fixed-frequency PWM architecture to maximize loop
bandwidth and provide fast-transient response to
pulsed loads that are typical for TFT LCD panel source
drivers. The 1.2MHz switching frequency allows the use
of low-profile inductors and ceramic capacitors to mini-
mize the thickness of LCD panel design. The integrated
high-efficiency MOSFET and the built-in digital soft-start
function reduce the number of external components
required while controlling inrush currents. The output
voltage can be set from V
resistive voltage-divider. The regulator controls the out-
put voltage and the power delivered to the output by
modulating the duty cycle (D) of the internal power
MOSFET in each switching cycle. The duty cycle of the
MOSFET is approximated by:
where V
Figure 3 shows the functional diagram of the step-up
regulator. An error amplifier compares the signal at FB
to 1.25V and changes the COMP output. The voltage at
COMP sets the peak inductor current. As the load
varies, the error amplifier sources or sinks current to the
COMP output accordingly to produce the inductor peak
Table 1. Component List
Fairchild Semiconductor
Sumida
TDK
Toshiba
DESIGNATION
Boost Regulator with Integrated Charge Pumps,
C3, C4, C7
C10, C14
C1, C2
AVDD
SUPPLIER
is the output voltage of the step-up regulator.
Switch Control, and High-Current Op Amp
10μF ±20%, 6.3V X5R ceramic capacitors
(0603)
Murata GRM188R60J106M
TDK C1608X5R0J106M
10μF ±20%, 25V X5R ceramic capacitors
(1206)
Murata GRM31CR61E106M
TDK C3216X5R1E106M
1μF ±10%, 50V X7R ceramic capacitors
(1206)
Murata GRM31MR71H105KA
TDK C3216X7R1H105K
______________________________________________________________________________________
D
≈
V
AVDD
Main Step-Up Regulator
V
AVDD
IN
DESCRIPTION
−
to 18V with an external
V
IN
408-822-2000
847-545-6700
847-803-6100
949-455-2000
PHONE
Figure 3. Step-Up Regulator Functional Diagram
current necessary to service the load. To maintain sta-
bility at high duty cycles, a slope-compensation signal
is summed with the current-sense signal.
DESIGNATION
C11, C15, C16,
OSCILLATOR
D2, D3, D4
408-822-2102
847-545-6720
847-390-4405
949-859-3963
TO FAULT LOGIC
MAX17075
CLOCK
C17
D1
L1
FAX
SLOPE COMP
COMPARATOR
CURRENT-LIMIT
COMPARATOR
COMPARATOR
PWM
FAULT
0.1μF ±10%, 50V X7R ceramic capacitors
(0603)
Murata GRM188R71H104K
TDK C1608X7R1H104K
3A, 30V Schottky diode (M-Flat)
Toshiba CMS02 (TE12L,Q) (Top mark S2)
220mA, 100V dual diodes (SOT23)
Fairchild MMBD4148SE (Top mark D4)
3.0μH, 3A
Sumida CDRH6D28-3R0
www.fairchildsemi.com
www.sumida.com
www.component.tdk.com
www.toshiba.com/taec
DRIVER
DC
LOGIC
AND
1.0V
START
inductor
SOFT-
DESCRIPTION
∑
ERROR AMP
WEBSITE
CURRENT
SENSE
I
LIMIT
1.25V
LX
PGND
FB
COMP
13