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PDF MAX17122 Data sheet ( Hoja de datos )
| Número de pieza | MAX17122 | |
| Descripción | Boost-Buck Regulator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX17122 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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19-4951; Rev 1; 11/09
EVAALVUAAILTAIOBNLEKIT
Step-Up, Step-Down Regulator, Gate-On Charge Pump,
and Boost-Buck Regulator for TV TFT LCD Display
General Description
The MAX17122 multiple-output power-supply IC gener-
ates all the supply rails for thin-film transistor (TFT) liquid-
crystal display (LCD) TV panels. It can operate from 8V
to 16.5V input voltages and is optimized for LCD TV
panel applications running directly from 12V regulated
supplies. It includes a 22V internal-switch step-down
regulator for digital logic, a 22V internal switch step-
up regulator to power the TFT source drivers, and a
temperature-compensated 36V internal-switch boost-
buck regulator that produces a negative output that can
vary according to the temperature sensed by an exter-
nal NTC thermistor. All three of these regulators feature
high-efficiency and fixed-frequency operation. High-
frequency operation allows the use of small inductors
and capacitors, resulting in a compact solution.
The MAX17122 includes a positive charge-pump linear
regulator controller that uses an external pnp bipolar
junction transistor (BJT) to typically form a regulated
charge-pump doubler to supply the LCD positive gate-
driver supply voltage. A negative gate-driver supply is
derived linearly between the boost-buck regulator’s out-
put and ground, using an external npn BJT connected to
ground and a small bypass capacitor.
Other features include an external-capacitor-timed,
open-drain, power-good output that monitors the step-
down regulator’s feedback and a simple untimed output
that monitors the positive charge-pump linear regulator’s
feedback. A high-voltage stress function is available for
the step-up regulator output. The GATE output directly
drives an external p-channel MOSFET to provide True
ShutdownK of the step-up output.
The MAX17122 is available in a 6mm x 6mm, 40-pin thin
QFN lead-free package and operates over the -40NC to
+85NC temperature range.
LCD TV Panels
Applications
Features
S 8V to 16.5V Operating Range
S 750kHz Switching Frequency
S 22V Internal-Switch High-Performance Step-Up
Regulator
Fast Load-Transient Response
Current-Mode PWM Operation
100mI, 3.9A nMOS Switch
Capacitor-Adjustable Soft-Start
High-Voltage Stress Function
Drives External pMOS Shutdown Switch
S 22V Internal-Switch Step-Down Regulator
Preset 1% Accurate 3.3V Output Voltage or
Adjustable Output (Dual Mode™)
Current-Mode PWM Operation
200mI, 2.5A nMOS Switch
Capacitor-Adjustable Power-Good Output
S 36V Internal-Switch Boost-Buck Regulator
Temperature-Compensated Output
Programmable Fixed Levels with Temperature-
Controlled Transition
Current-Mode PWM Operation
200mI, 1.8A pMOS Switch
S Positive Charge-Pump Linear Regulator Controller
Adjustable 1% Accurate Output Voltage
Uses External pnp Transistor
Regulates Switching-Node-Driven Charge-
Pump Doubler
Power-Good Output
S Negative Linear Regulator Controller
Adjustable 1.5% Accurate Output Voltage
Uses External npn Transistor
S Soft-Start for All Outputs
S Adjustable Power-Up Sequence
S Timed-Output Fault Protection with Restart for All
Outputs
S Latched Thermal-Shutdown Protection
S 40-Pin, 6mm x 6mm Thin QFN Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX17122ETL+ -40NC to +85NC
40 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
True Shutdown and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
Pin Configuration appears at end of data sheet.
_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
http://www.Datasheet4U.com
1 page  
Step-Up, Step-Down Regulator, Gate-On Charge Pump,
and Boost-Buck Regulator for TV TFT LCD Display
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = VIN2 = VIN3 = 12V, TA = 0°C to +85°C. Typical values are at TA = +25NC, unless otherwise noted.)
PARAMETER
POWER-GOOD BLOCKS
FB2 Power-Good Threshold
FB2 Threshold Hysteresis
RESET Output Low Voltage
RESET Leakage Current
FBP Power-Good Threshold
FBP Threshold Hysteresis
GPGD Output Low Voltage
GPGD Leakage Current
GATE FUNCTION
GATE Pulldown Current
GATE Drive Voltage
GATE Pullup Resistance
HVS BLOCK
HVS Input Low Voltage
HVS Input High Voltage
HVS Input Pulldown Resistance
RHVS Output Resistance
SEQUENCE CONTROL
EN1, EN2, DLY1, DLY2, DEL
Charge Current
CONDITIONS
FB2 rising
IRESET = 1mA
VRESET = 3V
FBP rising
IGPGD = 1mA
VGPGD = 3V
GATE charging current
Gate done current
VIN2 - VGATE, GATE enabled
GATE off, to IN2
IRHVS = 4mA
Measured at 1V
MIN TYP MAX UNITS
0.975 1.00 1.025
12
0.4
1
1.1 1.15 1.2
125
0.4
1
V
mV
V
FA
V
mV
V
FA
0.15
0.62
mA
5.0 5.35 5.65
V
25 I
0.6 V
1.85
V
1 MI
25 I
6 8.5 11 FA
EN1, EN2, DLY1, DLY2, DEL
Turn-On Threshold
1.25 1.30
V
EN1, EN2 Discharge Switch
On-Resistance
VL < UVLO or fault tripped
50 I
DLY1, DLY2, DLP Discharge
Switch On-Resistance
FAULT DETECTION
Duration to Trigger Fault
Duration to Restart After Fault
Thermal-Shutdown Threshold
EN1 = low or fault tripped
Typical hysteresis = 15NC
10
50
160
+160
I
ms
ms
NC
_______________________________________________________________________________________ 5
5 Page 
Step-Up, Step-Down Regulator, Gate-On Charge Pump,
and Boost-Buck Regulator for TV TFT LCD Display
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
BOOST-BUCK REGULATOR
LOAD-TRANSIENT
RESPONSE (40mA TO 380mA)
MAX17122 toc12
VGOFF2
0V (AC-COUPLED)
200mV/div
0A
L3 = 22µH
CCOMP3 = 470pF
RCOMP3 = 47.5kI
CCOMP3P = 10pF
100µs/div
ILOAD
200mA/div
BOOST-BUCK REGULATOR PEAK
INDUCTOR CURRENT AT CURRENT
LIMIT vs. INPUT VOLTAGE
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
8
9 10 11 12 13 14
INPUT VOLTAGE (V)
BOOST-BUCK REGULATOR OUTPUT
TEMPERATURE COMPENSATION
0
-5
-10
-15
-20
-25
-40
-20 0 20 40
TEMPERATURE (°C)
60
80
POSITIVE CHARGE-PUMP REGULATOR
NORMALIZED LOAD REGULATION
0.2
VIN = 10V
0
-0.2
-0.4 VIN = 12V
0V
-0.6
-0.8
-1.0
0
VAVDD = 16.5V
IAVDD = 350mA
50 100 150
LOAD CURRENT (mA)
0A
200
POSITIVE CHARGE-PUMP
REGULATOR LOAD-TRANSIENT
RESPONSE (0A TO 100mA)
MAX17122 toc16
VAVDD = 16.5V
IAVDD = 350mA
VGON
(AC-COUPLED)
1V/div
40µs/div
ILOAD
50mA/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX17122.PDF ] | |
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