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PDF MAX17075 Data sheet ( Hoja de datos )
| Número de pieza | MAX17075 | |
| Descripción | Boost-Regulator | |
| Fabricantes | Maxim Integrated Products | |
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Hay una vista previa y un enlace de descarga de MAX17075 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
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EVALUATION KIT AVAILABLE
MAX17075
Boost Regulator with Integrated Charge Pumps,
Switch Control, and High-Current Op Amp
General Description
The MAX17075 includes a high-voltage boost regulator,
one high-current operational amplifier, two regulated
charge pumps, and one MLG block for gate-driver
supply modulation.
The step-up DC-DC converter is a 1.2MHz current-
mode boost regulator with a built-in power MOSFET. It
provides fast load-transient response to pulsed loads
while producing efficiencies over 85%. The built-in
160mΩ (typ) power MOSFET allows output voltages as
high as 18V boosted from inputs ranging from 2.5V to
5.5V. A built-in 7-bit digital soft-start function controls
startup inrush currents.
The gate-on and gate-off charge pumps provide regu-
lated TFT gate-on and gate-off supplies. Both output
voltages can be adjusted with external resistive
voltage-dividers.
The operational amplifier, typically used to drive the
LCD backplane (VCOM), features high-output short-cir-
cuit current (±500mA), fast slew-rate (45V/µs), wide
bandwidth (20MHz), and rail-to-rail outputs.
The MAX17075 is available in a 24-pin thin QFN pack-
age with 0.5mm lead spacing. The package is a square
(4mm x 4mm) with a maximum thickness of 0.8mm for
ultra-thin LCD design. It operates over the -40°C to
+105°C temperature range.
Applications
Notebook Computer Displays
LCD Monitor Panels
LCD TVs
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX17075ETG+
-40°C to +85°C
24 TQFN-EP*
MAX17075GTG/V+ -40°C to +105°C
24 TQFN-EP*
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Features
♦ 2.5V to 5.5V Input Operating Range
♦ Current Mode Step-Up Regulator
Fast-Transient Response
Built-In 20V, 3A, 0.16Ω n-Channel Power MOSFET
Cycle-by-Cycle Current Limit
87% Efficiency (5V Input to 13V Output)
1.2MHz Switching Frequency
±1% Output Voltage Regulation Accuracy
♦ High-Current 18V VCOM Buffer
±500mA Output Short-Circuit Current
45V/µs Slew Rate
20MHz -3dB Bandwidth
Rail-to-Rail Output
♦ Regulated Charge Pump for TFT Gate-On Supply
♦ Regulated Charge Pump for TFT Gate-Off Supply
♦ Logic-Controlled High-Voltage Switches with
Adjustable Delay
♦ Soft-Start and Timed Delay Fault Latch for All
Outputs
♦ Overload and Thermal Protection
Simplified Operating Circuit
VIN
2.5V TO 5.5V
R1
10Ω
C5
1µF
TO VCOM
VAVDD
BGND
VCC LX
PGND
FB
OUT COMP
MAX17075
NEG
POS
REF
AGND
RST
RSTIN
DRN
COM
SRC
VMAIN
FROM
SYSTEM
3.3V
VIN
VGON
VGOFF
FBN
DRVN
DRVP
BGND
FBP
SUP CTL EP DEL
Pin Configuration appears at end of data sheet.
FROM
TCON
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4353; Rev 2; 12/12
1 page  
MAX17075
Boost Regulator with Integrated Charge Pumps,
Switch Control, and High-Current Op Amp
ELECTRICAL CHARACTERISTICS
(VCC = +5V, Circuit of Figure 1, VAVDD = VSUP = +13V, TA = -40°C to +105°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP
VCC Input Supply Range
VCC Undervoltage-Lockout Threshold
VCC Shutdown Current
VCC Quiescent Current
REFERENCE
VCC rising, hysteresis (typ) = 50mV
VFB = 1.3V, not switching
VFB = 1.0V, switching
2.5
2.05
REF Output Voltage
REF Load Regulation
REF Sink Current
REF Undervoltage-Lockout Threshold
No external load
0 < ILOAD < 50µA
In regulation
Rising edge, hysteresis (typ) = 200mV
1.230
10
OSCILLATOR AND TIMING
Frequency
1000
Oscillator Maximum Duty Cycle
Duration to Trigger Fault Condition
DEL Capacitor Charge Current
DEL Turn-On Threshold
STEP-UP REGULATOR
FB or FBP or FBN below threshold
During startup, VDEL = 1.0V
86
47
4
1.19
Output Voltage Range
FB Regulation Voltage
FB Fault Trip Level
FB Line Regulation
FB Input Bias Current
FB Transconductance
LX Current Limit
LX On-Resistance
Current-Sense Transresistance
POSITIVE CHARGE-PUMP REGULATOR
FB = COMP, CCOMP = 1nF
Falling edge
VCC = 2.5V to 5.5V
VFB = 1.25V
∆I = ±2.5µA at COMP, FB = COMP
VFB = 1.1V, duty cycle = 75%
ILX = 200mA
VIN
1.230
0.96
-0.25
50
75
2.5
0.10
VSUP Input Supply Range
VSUP Overvoltage Threshold
FBP Regulation Voltage
FBP Line Regulation Error
FBP Input Bias Current
DRVP PCH On-Resistance
DRVP NCH On-Resistance
FBP Fault Trip Level
VSUP = rising, hysteresis = 200mV
VSUP = 8V to 18V, VGON = 30V
VFBP = 1.5V, TA = +25°C
Falling edge
6
19
-2% 1.25
-50
0.96
Positive Charge-Pump Soft-Start Period
7-bit voltage ramp with filtering to prevent
high peak currents
MAX
5.5
2.45
200
1.5
5
1.267
6
1.17
1400
94
65
6
1.31
18
1.267
1.04
+0.25
200
280
3.5
0.25
0.30
18
21
+2%
0.2
+50
6
3
1.04
5
UNITS
V
V
µA
mA
V
mV
µA
V
kHz
%
ms
µA
V
V
V
V
%/V
nA
µS
A
Ω
V/A
V
V
V
%/V
nA
Ω
Ω
V
ms
Maxim Integrated
5
5 Page 
MAX17075
Boost Regulator with Integrated Charge Pumps,
Switch Control, and High-Current Op Amp
VIN
2.5V TO 5.5V
(4.5 TO 5.5V FOR FULL LOAD)
R1
10Ω
TO VCOM
C5
1µF
VAVDD
R3
100kΩ
R6
13.7kΩ
R7
100kΩ
VGOFF
-7V/20mA
C10
1µF
L1
3.0µH
C1 C2
10µF 10µF
6.3V 6.3V
VCC LX
PGND
D1
VAVDD
C3 C4 13V/500mA
10µF 10µF
25V 25V
R8
187kΩ
OUT
NEG
C9
0.22µF
POS
REF
AGND
FBN
D4 C11
0.1µF DRVN
BGND
SUP
VAVDD
MAX17075
FB
COMP
RST
RSTIN
DRN
COM
SRC
R10
100kΩ
C12
220pF
FROM SYSTEM
R9 3.3V
20kΩ
VIN
R13
10kΩ
R11
R14
1kΩ
C14
1µF
VAVDD
VGON
30V/20mA
C15
0.1µF
D2
R12
20kΩ
VAVDD
DRVP
C17
0.1µF
C16
1µF
FBP
EP CTL DEL
C8
C6 0.033µF
1µF
FROM TCON
D3 R15
464kΩ
R16
20kΩ
C13
0.01µF
Figure 1. Typical Operating Circuit
Typical Operating Circuit
The typical operating circuit (Figure 1) of the
MAX17075 is a complete power-supply system for TFT
LCD panels in monitors and TVs. The circuit generates
a +13V source driver supply, a +30V positive gate-dri-
ver supply, and a -7V negative gate-driver supply from
a +2.5V to +5.5V input supply. Table 1 lists some
selected components, and Table 2 lists the contact
information for component suppliers.
Maxim Integrated
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet MAX17075.PDF ] | |
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