MAX1530_09 Datasheet, PDF (1/33 Pages) Maxim Integrated Products – Multiple-Output Power-Supply Controllers for LCD Monitors

19-2866; Rev 1; 11/09
EVAALVUAAILTAIOBNLEKIT
Multiple-Output Power-Supply
Controllers for LCD Monitors
General Description
The MAX1530/MAX1531 multiple-output power-supply
controllers generate all the supply rails for thin-film tran-
sistor (TFT) liquid-crystal display (LCD) monitors. Both
devices include a high-efficiency, fixed-frequency,
step-down regulator. The low-cost, all N-channel, syn-
chronous topology enables operation with efficiency as
high as 93%. High-frequency operation allows the use
of small inductors and capacitors, resulting in a com-
pact solution. The MAX1530 includes three linear regu-
lator controllers and the MAX1531 includes five linear
regulator controllers for supplying logic and LCD bias
voltages. A programmable startup sequence enables
easy control of the regulators.
The MAX1530/MAX1531 include soft-start functions to
limit inrush current during startup. An internal step-
down converter current-limit function and a versatile
overcurrent shutdown protect the power supplies against
fault conditions. The MAX1530/MAX1531 use a current-
mode control architecture, providing fast load transient
response and easy compensation. An internal linear
regulator provides MOSFET gate drive and can be
used to power small external loads.
The MAX1530/MAX1531 can operate from inputs as
high as 28V and are well suited for LCD monitor and TV
applications running directly from AC/DC wall adapters.
Both devices are available in a small (5mm x 5mm),
ultra-thin (0.8mm), 32-pin QFN package and operate
over the -40°C to +85°C temperature range.
Applications
LCD Monitors and TVs
Automotive LCDs
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1530ETJ+
-40°C to +85°C 32 TQFN-EP*
MAX1530ETJ+T
-40°C to +85°C 32 TQFN-EP*
MAX1531ETJ+
-40°C to +85°C 32 TQFN-EP*
MAX1531ETJ+T
-40°C to +85°C 32 TQFN-EP*
MAX1531ETJ/V+
-40°C to +85°C 32 TQFN-EP*
MAX1531ETJ/V+T
-40°C to +85°C 32 TQFN-EP*
*EP = Exposed pad.
+Denotes lead(Pb)-free/RoHS-compliant package.
/V indicates an automotive-qualified part.
T indicates tape and reel.
Pin Configuration appears at end of data sheet.
Features
o 4.5V to 28V Input Voltage Range
o 250kHz/500kHz Current-Mode Step-Down Converter
Small Inductor/Capacitors
No Sense Resistor
o Three Positive Linear Regulator Controllers
One Positive and One Negative Additional
Controller (MAX1531)
Small Input and Output Capacitors
o Timed Reset Output
o Uncommitted Overcurrent Protection (MAX1531)
o Soft-Start for All Regulators
o Programmable Input Undervoltage Comparator
o Programmable Startup Sequencing
Minimal Operating Circuit
VP
VN
VIN = 12V
VOUT
3.3V/1.5A
VOUT
VLOGIC
2.5V/500mA
VL
VP
VGON
25V
VIN
VL
CSH
CSL
BST
IN
DRV4
DH
FBL4
LX
MAX1530
DL
EN
PGND
ILIM
FB
COMP
FREQ
VL
AGND
RESET
RSTIN
DRV1
DRV2
FBL2
FBL1
ONL2
ONL3
ONL4
SEQ
ONL5
DRV3
FBL3
DRV5
FBL5
VIN
VSOURCE
10V/500mA
VL
VIN
VGAMMA
9.7V
VN
VGOFF
-9V
VL
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.