Datasheet

Step-Up, Step-Down Regulator, Gate-On Charge Pump,
and Boost-Buck Regulator for TV TFT LCD Display
MAX17122
2 ______________________________________________________________________________________
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
IN, IN2, IN3, EN1, EN2, LX1, GATE,
DRVP, RHVS to AGND ......................................-0.3V to +22V
GATE to IN ...........................................................-6.5V to +0.3V
GND1 to AGND ................................................................. Q0.3V
DLY1, DLY2, DEL, VL, RESET, GPGD,
HVS to AGND ......................................................-0.3V to +6V
FBP, FBN, FB1, FB2, FB3, COMP1, COMP3, OUTB
SET, NTC, SS to AGND ......................... -0.3V to (V
VL
+ 0.3V)
DRVN to VL ...........................................................-36V to +0.3V
LX2 to GND1 ............................................ -0.3V to (V
IN2
+ 0.3V)
LX3 to IN3 ..............................................................-36V to +0.3V
BST2 to VL .............................................................-0.3V to +22V
BST2 to LX2 .............................................................-0.3V to +6V
RMS LX1, GND1, IN2, IN3, LX3 Current (each pin) ............1.6A
RMS LX2 (total for both pins) ...............................................2.4A
RMS VL, DRVN, DRVP Current ..........................................50mA
Continuous Power Dissipation (T
A
= +70NC)
40-Pin Thin QFN
(derate 35.7mW/NC above +70NC) .........................2857.1mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature .....................................................+160NC
Storage Temperature Range ............................ -65NC to +165NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= V
IN2
= V
IN3
= 12V, T
A
= 0°C to +85°C. Typical values are at T
A
= +25NC, unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS
PARAMETER CONDITIONS MIN TYP MAX UNITS
GENERAL
IN, IN2, IN3
Input-Voltage Range
8 16.5 V
IN + IN2 + IN3
Quiescent Current
Only LX2 and LX3 switching (V
FB1
= V
FBP
= 1.5V, V
FB2
=
1.1V, V
FB3
= 1.8V, V
FBN
= 1.5V); V
EN1
= V
EN2
= 5V
10 15
mA
LX2 and LX3 not switching (V
FB1
= V
FB2
= V
FBP
= 1.5V,
V
FBN
= 1.5V, V
FB3
= 0); V
EN1
= V
EN2
= 5V
2 4
IN + IN2 + IN3
Shutdown Current
EN1 = EN2 = AGND (shutdown) 0.55 1 mA
SMPS Operating Frequency 638 750 862 kHz
Phase Difference Between
Regulators
Step-down and boost-buck 180
Degrees
Step-down and step-up 180
IN Undervoltage-Lockout
Threshold
V
IN
rising, 2.5% hysteresis 6 7 8 V
VL REGULATOR
VL Output Voltage
I
VL
= 10mA, V
FB1
= V
FB2
= V
FBP
= 1.1V, V
FBN
= 0.75V,
V
FB3
= 1.8V (all regulators switching)
4.9 5.0 5.1 V
VL Undervoltage-Lockout
Threshold
VL rising, 2.5% hysteresis
3.6 4.0 4.4 V
STEP-DOWN REGULATOR
OUTB Voltage in Fixed Mode FB2 = AGND, no load (Note 1)
T
A
= +25NC
3.267 3.300 3.333
V
0NC < T
A
< +85NC
3.25 3.35
FB2 Voltage in Adjustable Mode V
OUTB
= 3.3V, no load (Note 1)
T
A
= +25NC
1.2375 1.250 1.2625
V
0NC < T
A
< +85NC
1.23 1.27
FB2 Adjustable-Mode
Threshold Voltage
Dual-mode comparator 0.10 0.15 0.20 V