Rainbow Electronics MAX15054 User Manual
19-4747; Rev 0; 9/09
High-Side MOSFET Driver for HB LED Drivers
General Description
The MAX15054 is a high-side, n-channel MOSFET driver
for high-voltage applications capable of switching at high
frequencies. This device is controlled by a CMOS logiclevel signal referenced to ground and features a very
short (12ns, typ) propagation delay from input to output.
The high-voltage operation and high source/sink-current
capability make the MAX15054 ideal for HB LED drivers
and DC-DC converters.
The MAX15054 is well suited to complement other Maxim
LED driver products such as the MAX16814, MAX16838,
MAX16833, MAX16834, and MAX16826. The MAX15054
adds a high-side driver to those products that include only a
low-side driver; it then allows for buck-boost configurations
for multistring drivers similar to the MAX16814, MAX16838,
and MAX16826, and for buck-boost conversion with output
referenced to ground for single-string drivers such as the
MAX16834 and MAX16833.
The MAX15054 is available in the industry-standard 6-pin
SOT23 package and operates over the -40NC to +125NC
automotive temperature range.
and DC-DC Applications
Features
Input Voltage on High-Side n-Channel MOSFET Up
S
to 60V
S Up to 13.5V Logic Input Independent of Supply
Voltage
S 2A Peak Source and Sink Current
S 12ns Propagation Delay
S Rise and Fall Times of 6ns while Driving 1000pF
Capacitance
S Low Input Capacitance
S Low-Side and High-Side Undervoltage Protection
S Allows Buck-Boost Topology Referred to Ground
for LED Drivers and DC-DC Converters
S Allows Buck-Boost Topology for Multistring LED
Drivers
S 6-Pin SOT23 Package
Ordering Information
MAX15054
Applications
HB LED Drivers for Single and Multiple Strings
LED Backlight Drivers
High-Side Driver for DC-DC Converters
(Buck, Buck-Boost, Half-Bridge, Full-Bridge)
PART TEMP RANGE
MAX15054AUT+
-40NC to +125NC
PIN-
PACKAGE
6 SOT23 ACOM
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration appears at end of data sheet.
TOP
MARK
Typical Operating Circuits
V
IN
V
DD
C
1
GND
C
2
R
1
R
2
IN GATE NDRV
EN
V
CC
C
3
R
3
V
DRV
C
4
DIM
COMP
R
4
SGND PGND
C
4
CFB
D
1
MAX15054
MAX16838
HI
LEDGND
HDRV
DRAIN
OUT1
OUT2
BST
C
BST
Q1
LX
OV
R
7
ISET
FLT
CS
RT
R
6
D
3
L1
C
D
2
R
5
5
R
8
R
9
Typical Operating Circuits continued 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.
High-Side MOSFET Driver for HB LED Drivers
and DC-DC Applications
ABSOLUTE MAXIMUM RATINGS
VDD to GND ............................................................. -0.3V to +6V
LX to GND ................................................................-2V to +65V
HDRV to LX ................................................-0.3V to (VDD + 0.3V)
BST to LX ................................................................. -0.3V to +6V
HI to GND .............................................................. -0.3V to +15V
dV/dt at LX ........................................................................50V/ns
Peak Current into HDRV (< 100ns) ...................................... Q2A
Continuous Current into HDRV ..................................... Q100mA
Continuous Power Dissipation (TA = +70NC)
MAX15054
6-Pin SOT23 (derate 8.7mW/NC above +70NC) .........695.7mW
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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
(VDD = V
unless otherwise noted.) (Note 2)
Operating Supply Voltage V
VDD Quiescent Supply Current I
BST Quiescent Supply Current I
BST Operating Supply Current I
VDD Undervoltage Lockout
Threshold
VDD Undervoltage Lockout
Threshold Hysteresis
BST-to-LX Undervoltage
Lockout Threshold
BST-to-LX Undervoltage
Lockout Threshold Hysteresis
LOGIC INPUT (HI)
HI Logic-High Threshold V
HI Logic-Low Threshold V
HI Logic-Input Hysteresis 0.9 V
HI Input Current I
HI Input Resistance R
DRIVER
LX Withstand Voltage V
BST Withstand Voltage V
LX Pulldown Current VLX = 2.5V 500 740 1100
Driver Output Resistance
(Sourcing)
Driver Output Resistance
(Sinking)
= 5V, VLX = V
BST
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
= 0V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C,
GND
DD
DD
BST
BSTO
V
DD_UVLOVDD
V
BST_
UVLO
IH
IL
IN
IN
LX_MAX
BST_MAX
R
ON_HP
R
ON_HN
No switching 40 75
No switching 65 125
fSW = 500kHz, no load 0.3 1.3 mA
rising 3.92 4.22 4.56 V
BST rising 3.54 3.82 4.1 V
HI = GND -2 +2
V
- VLX = 4.5V,
BST
100mA sourcing
V
- VLX = 4.5V,
BST
100mA sinking
Thermal Resistance (Note 1)
Junction-to-Ambient Thermal Resistance (BJA) .........115NC/W
Junction-to-Case Thermal Resistance (BJC) ................80NC/W
Operating Temperature Range ........................ -40NC to +125NC
Maximum Junction Temperature .....................................+150NC
Storage Temperature Range ............................ -65NC to +150NC
Lead Temperature (soldering, 10s) .................................+300NC
4.6 5.5 V
0.2 V
0.2 V
3.9 V
1.8 V
300
60 V
65 V
TA = +25NC
TA = +125NC
TA = +25NC
TA = +125NC
1 1.5
1.25 2
0.75 1
1 1.5
FA
FA
FA
kI
FA
I
I
2 ______________________________________________________________________________________
High-Side MOSFET Driver for HB LED Drivers
and DC-DC Applications
ELECTRICAL CHARACTERISTICS (continued)
(VDD = V
unless otherwise noted.) (Note 2)
Peak Output Current (Sourcing) I
Peak Output Current (Sinking) I
SWITCHING CHARACTERISTICS
Rise Time t
Fall Time t
Turn-On Propagation Delay t
Turn-Off Propagation Delay t
Note 2: All devices are 100% production tested at TA = +25NC. Limits over the operating temperature range are guaranteed by
Note 3: Guaranteed by design.
= 5V, VLX = V
BST
= 0V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C,
GND
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
PK_HP
PK_HN
= 0V 2.5 A
HDRV
V
= 5V 2.5 A
HDRV
No-load capacitor 1.5
R
CL = 5000pF 18
No-load capacitor 1.5
F
CL = 5000pF 16
D_ON
D_OFF
Figure 1, CL = 1000pF (Note 3) 11 25 ns
Figure 1, CL = 1000pF (Note 3) 11 25 ns
design.
nsCL = 1000pF 6
nsCL = 1000pF 6
MAX15054
V
IH
V
HI
t
D_ON
V
HDRV
10%
t
R
Figure 1. Turn-On/Turn-Off Propagation Delay
90%
V
t
D_OFF
IL
t
F
_______________________________________________________________________________________ 3
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