EVALUATION KIT AVAILABLE
MAX1530/MAX1531
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, synchronous
topology enables operation with efficiency as high as 93%.
High-frequency operation allows the use of small induc-
tors and capacitors, resulting in a compact solution. The
MAX1530 includes three linear regulator 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 stepdown
converter current-limit function and a versatile overcurrent
shutdown protect the power supplies against fault condi-
tions. The MAX1530/MAX1531 use a currentmode 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.
Features
●
4.5V to 28V Input Voltage Range
●
250kHz/500kHz Current-Mode Step-Down Converter
• Small Inductor/Capacitors
• No Sense Resistor
●
Three Positive Linear Regulator Controllers
• One Positive and One Negative Additional
Controller (MAX1531)
• Small Input and Output Capacitors
●
Timed Reset Output
●
Uncommitted Overcurrent Protection (MAX1531)
●
Soft-Start for All Regulators
●
Programmable Input Undervoltage Comparator
●
Programmable Startup Sequencing
Minimal Operating Circuit
V
P
V
IN
CSH
V
N
V
L
CSL
V
IN
= 12V
BST
IN
V
OUT
3.3V/1.5A
DH
LX
DL
DRV4
FBL4
V
SOURCE
10V/500mA
V
IN
MAX1530
EN
ILIM
FREQ
VL
AGND
V
IN
DRV2
V
L
PGND
FB
COMP
RESET
RSTIN
Applications
●
LCD Monitors and TVs
Ordering Information
PART
MAX1530ETJ+
MAX1530ETJ+T
MAX1531ETJ+
MAX1531ETJ+T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
32 TQFN-EP*
32 TQFN-EP*
32 TQFN-EP*
32 TQFN-EP*
V
L
V
P
V
LOGIC
25V/500mA
V
OUT
DRV1
FBL1
FBL2
V
GAMMA
-9.7V
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Pin Configuration
appears at end of data sheet.
SEQ
ONL2
ONL3
ONL4
ONL5
V
IN
DRV3
V
GON
25V
FBL3
DRV5
FBL5
V
GOFF
-9V
19-2866; Rev 3; 3/14
MAX1530/MAX1531
Multiple-Output Power-Supply
Controllers for LCD Monitors
Absolute Maximum Ratings
IN, DRV1, DRV2, DRV3, DRV4, CSH,
CSL to AGND ....................................................-0.3V to +30V
DRV5 to VL .............................................................-28V to +0.3V
CSH to CSL ..............................................................-0.3V to +6V
VL to AGND..............................................................-0.3V to +6V
PGND to AGND...................................................................±0.3V
LX to BST..................................................................-6V to +0.3V
BST to AGND..........................................................-0.3V to +36V
DH to LX .....................................................-0.3V to (BST + 0.3V)
DL to PGND ..................................................-0.3V to (VL + 0.3V)
SEQ, ONL2, ONL3, ONL4, ONL5, COMP,
ILIM to AGND...........................................-0.3V to (VL + 0.3V)
RSTIN, RESET, EN, FB, FBL1, FBL2, FBL3, FBL4, FBL5,
FREQ to AGND....................................................-0.3V to +6V
VL Short Circuit to AGND ...........................................Momentary
Continuous Power Dissipation (T
A
= +70°C)
32-Pin Thin QFN (derate 21.3mW/°C above +70°C) ...1702mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
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.
Electrical Characteristics
(Circuit of
Figure 1,
V
IN
= 12V, V
EN
= V
SEQ
= 5V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
GENERAL
Operating Input Voltage Range
Quiescent Supply Current
IC Disable Supply Current
VL REGULATOR
VL Output Voltage
VL Undervoltage Lockout Threshold
CONTROL AND SEQUENCE
SEQ, FREQ Input Logic High Level
SEQ, FREQ Input Logic Low Level
SEQ, FREQ Input Leakage Current
ONL_ Input Threshold
ONL_ Source Current
ONL_ Input Leakage Current
ONL_ Input Discharge Clamp Resistance
EN Input Threshold
EN Input Leakage Current
FAULT DETECTION
FB, FBL1, FBL2, FBL3, FBL4
Undervoltage Fault Trip Level
FBL5 Undervoltage Fault Trip Level
FB, FBL1, FBL2, FBL3, FBL4 falling,
25mV hysteresis
FBL5 rising, 25mV hysteresis
1.081
300
1.114
400
1.147
500
V
mV
ONL_ rising, 25mV hysteresis
SEQ = EN = VL, V
ONL _
= 0 to 1.24V
SEQ = EN = VL, ONL_ = VL
V
SEQ
= 0V
EN rising, 5% hysteresis
-1
1.201
1.8
-500
800
1.201
-50
1500
1.238
1.238
2.0
2.0
0.6
+1
1.275
2.2
+500
3000
1.275
+50
V
V
µA
V
µA
nA
Ω
V
nA
5.5V < V
IN
< 28V, 0 < I
VL
< 30mA
VL rising, 3% hysteresis
4.75
3.2
5
3.5
5.25
3.8
V
V
(Note 1)
V
FB
= V
FBL1
= V
FBL2
= V
FBL3
=
V
FBL4
= 1.5V, V
FBL5
= 0V
EN = AGND
4.5
1.7
200
28.0
3.0
400
V
mA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
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Maxim Integrated
│
2
MAX1530/MAX1531
Multiple-Output Power-Supply
Controllers for LCD Monitors
Electrical Characteristics (continued)
(Circuit of
Figure 1,
V
IN
= 12V, V
EN
= V
SEQ
= 5V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Comparator Bandwidth
Duration to Trigger Fault Latch
Overcurrent Protection Threshold
Overcurrent Sense Common-Mode Range
CSH Input Current
CSL Input Current
Overcurrent Sense Filter RC Time
Constant
THERMAL PROTECTION
Thermal Shutdown
RESET FUNCTION
RSTIN Reset Trip Level
RSTIN Input Leakage Current
Comparator Bandwidth
Reset Timeout Period
RESET Output Low Level
RESET Output High Leakage
STEP-DOWN CONTROLLER
ERROR AMPLIFIER
FB Regulation Voltage
Transconductance
Voltage Gain
Minimum Duty Cycle
FB Input Leakage Current
FB Input Common-Mode Range
COMP Output Minimum Voltage
COMP Output Maximum Voltage
Current-Sense Amplifier Voltage Gain
Current-Limit Threshold (Default Mode)
Current-Limit Threshold (Adjustable Mode)
ILIM Input Dual Mode™ Threshold
OSCILLATOR
Switching Frequency
Maximum Duty Cycle
FREQ = AGND
FREQ = VL
FREQ = AGND
FREQ = VL
200
425
75
75
250
500
80
80
300
575
88
88
kHz
%
V
FB
= 1.5V
(Note 2)
V
FB
= 1.5V
V
FB
= 1.175V
V
IN
- V
LX
PGND - LX, ILIM = VL
PGND - LX, V
ILIM
= 1.25V
2.75
190
190
3.0
-50
-0.1
1
3
3.5
250
250
3.5
4.0
310
310
4.00
FB to COMP
FB to COMP
1.223
70
1.238
100
200
15
+50
+1.5
1.253
140
V
µS
V/V
%
nA
V
V
V
V/V
mV
mV
V
I
RESET
= -1mA
V
RESET
= 5V
102
RSTIN falling, 25mV hysteresis
V
RSTIN
= 1.5V
1.081
-50
10
128
154
0.4
1
1.114
1.147
+50
V
nA
kHz
ms
V
µA
Temperature rising, 15°C hysteresis
160
°C
For FB, FBL_
(V
CSH
- V
CSL
)
V
CSH
, V
CSL
V
CSH
= 2.7V to 28V
V
CSL
= V
CSH
= 12V
-50
50
CONDITIONS
For EN, FB, FBL_
51
270
2.7
MIN
TYP
10
64
300
77
330
28.0
100
+50
MAX
UNITS
kHz
ms
mV
V
µA
nA
µs
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Maxim Integrated
│
3
MAX1530/MAX1531
Multiple-Output Power-Supply
Controllers for LCD Monitors
Electrical Characteristics (continued)
(Circuit of
Figure 1,
V
IN
= 12V, V
EN
= V
SEQ
= 5V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SOFT-START
Step Size
Period
FET DRIVERS
DH, DL On-Resistance
DH, DL Output Drive Current
LX, BST Leakage Current
LINEAR REGULATOR CONTROLLERS
POSITIVE LINEAR REGULATOR (LR1)
FBL1 Regulation Voltage
FBL1 Input Bias Current
FBL1 Effective Load Regulation
Error (Transconductance)
FBL1 Line Regulation Error
DRV1 Sink Current
DRV1 Off-Leakage Current
FBL1 Input Common-Mode Range
Soft-Start Step Size
Soft-Start Period
V
DRV1
= 5V, I
DRV1
= 100µA
V
FBL1
= 1.5V
V
DRV1
= 5V, I
DRV1
= 100µA to 2mA
I
DRV1
= 100µA, 5.5V < V
IN
< 28V
V
FBL1
= 1.175V, V
DRV1
= 5V
V
FBL
1 = 1.5V, V
DRV1
= 28V
(Note 2)
Measured at FBL1
FREQ = GND
FREQ = VL
V
DRV_
= 5V, I
DRV_
= 100µA
V
FBL _
= 1.5V
V
DRV_
= 5V, I
DRV_
= 50µA to 1mA
I
DRV_
= 100µA, 5.5V < V
IN
< 28V
V
FBL_
= 1.175V, V
DRV_
= 5V
V
FBL _
= 1.5V, V
DRV_
= 28V
(Note 2)
Measured at FBL_
-0.1
1.238 / 32
2
4
0.1
10
+1.5
1.226
-50
-1.5
-0.1
1.238 / 32
1024/f
OSC
2048/f
OSC
1.245
1.264
+50
-2
5
3
10
0.1
10
+1.5
1.226
-50
-15
1.245
1.264
+50
-2
5
V
nA
%
mV
mA
µA
V
V
s
Sourcing or sinking, V
DH
or V
DL
= V
VL
/ 2
V
BST
= V
LX
= V
IN
= 28V
3
0.5
20
10
Ω
A
µA
Measured at FB
FREQ = GND
FREQ = VL
1.238/32
1024/f
OSC
2048/f
OSC
V
s
CONDITIONS
MIN
TYP
MAX
UNITS
POSITIVE LINEAR REGULATORS (LR2 AND LR3)
FBL_ Regulation Voltage
FBL_ Input Bias Current
FBL_ Effective Load Regulation
Error (Transconductance)
FBL_ Line Regulation Error
DRV_ Sink Current
DRV_ Off-Leakage Current
FBL_ Input Common-Mode Range
Soft-Start Step Size
V
nA
%
mV
mA
µA
V
V
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Maxim Integrated
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4
MAX1530/MAX1531
Multiple-Output Power-Supply
Controllers for LCD Monitors
Electrical Characteristics (continued)
(Circuit of
Figure 1,
V
IN
= 12V, V
EN
= V
SEQ
= 5V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Soft-Start Period
POSITIVE LINEAR REGULATOR (LR4)
FBL4 Regulation Voltage
FBL4 Input Bias Current
FBL4 Effective Load Regulation
Error (Transconductance)
FBL4 Line Regulation Error
DRV4 Sink Current
DRV4_Off-Leakage Current
FBL4 Input Common-Mode Range
Soft-Start Step Size
Soft-Start Period
NEGATIVE LINEAR REGULATOR (LR5)
FBL5 Regulation Voltage
FBL5 Input Bias Current
FBL5 Effective Load Regulation
Error (Transconductance)
FBL5 Line Regulation Error
DRV5 Source Current
DRV5 Off-Leakage Current
FBL5 Input Common-Mode Range
Soft-Start Step Size
Soft-Start Period
V
DRV5
= -10V, I
DRV5
= 100µA
V
FBL5
= 0V
V
DRV5
= -10V, I
DRV5
= 50µA to 1mA
I
DRV5
= 100µA, 5.5V < V
IN
< 28V
V
FBL5
= 200mV, V
DRV5
= -10V
V
FBL5
= 0V, V
DRV5
= -20V
(Note 2)
Measured at FBL5
FREQ = AGND
FREQ = VL
-0.1
1.238 / 32
1024 / f
OSC
2048 / f
OSC
2
9
0.1
10
+15
100
-50
-1.5
125
150
+50
-2
5
mV
nA
%
mV
mA
µA
V
V
s
V
DRV4
= 5V, I
DRV4
= 500µA
V
FBL4
= 1.5V
V
DRV4
= 5V, I
DRV4
= 500µA to 10mA
I
DRV4
= 500µA, 5.5V < V
IN
< 28V
V
FBL4
= 1.175V, V
DRV4
= 5V
V
FBL4
= 1.5V, V
DRV4
= 28V
(Note 2)
Measured at FBL4
FREQ = GND
FREQ = VL
-0.1
1.238 / 32
1024 / f
OSC
2048 / f
OSC
10
28
0.1
10
+1.5
1.226
-50
-1.5
1.245
1.264
+50
-2
5
V
nA
%
mV
mA
µA
V
V
s
FREQ = GND
FREQ = VL
CONDITIONS
MIN
TYP
1024 / f
OSC
2048 / f
OSC
MAX
UNITS
s
Electrical Characteristics
(Circuit of
Figure 1,
V
IN
= 12V, V
EN
= V
SEQ
= 5V,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 3)
PARAMETER
GENERAL
Operating Input Voltage Range
VL REGULATOR
VL Output Voltage
VL Undervoltage Lockout
Threshold
5.5V < V
IN
< 28V, 0 < I
VL
< 30mA
VL rising, 3% hysteresis
4.75
3.2
5.25
3.8
V
V
(Note 1)
4.5
28.0
V
CONDITIONS
MIN
TYP
MAX
UNITS
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Maxim Integrated
│
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