Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ......................................................+150°C
Soldering Temperature (reflow) .......................................+260°C
Note 1:
LX has internal clamp diodes to PGND and SUP. Applications that forward bias these diodes should not exceed the IC’s package
power dissipation limits.
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.
Package Information
15 WLP
Package Code
Outline Number
Land Pattern Number
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
JA
)
61.65°C/W
W151G2+1
21-100111
90-100052
(Refer to
Application Note 1891)
For the latest package outline information and land patterns (footprints), go to
www.maximintegrated.com/packages.
Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
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.maximintegrated.com/thermal-tutorial.
www.maximintegrated.com
Maxim Integrated
│
2
MAX77756
24V Input, 500mA Buck Regulator
with Dual-Input Power MUX
Electrical Characteristics
(V
SUP
= V
EN
= 12V, V
IO
= 1.8V, V
IN1
= V
IN2
= 0V, configuration registers in reset. Limits are 100% production tested at T
A
= +25°C,
limits over T
A
= -40°C to +85°C are guaranteed by design and characterization, unless otherwise noted.)
PARAMETER
STEP-DOWN CONVERTER
SUP Voltage Range
SUP Undervoltage Lockout
SUP Undervoltage Lockout
Hysteresis
SUP Shutdown Current
SUP QUIESCENT CURRENT
I
LOAD
= 0mA, V
OUT
= 1.8V
SUP Quiescent Current
I
SUP-Q
I
LOAD
= 0mA, V
OUT
= 3.3V
I
LOAD
= 0mA, V
OUT
= 5.0V
I
LOAD
= 0mA, external feedback version
BIAS Regulator Voltage
V
BIAS
V
SUP
= 5.5V to 24V, BIAS not internally
connected to OUT (Note 1)
Internal feedback version target regulation
voltage, adjustable through I
2
C from 1.5V
to 7.5V in 50mV/LSB with
V_OUTREG[7:0]
6
1.5
2.65
32
5
18
3.0
5.0
70
V
μA
I
SUP-SHDN
V
EN
= 0V (buck converter disabled)
V
SUP
V
UVLO
V
SUP
rising
3
2.75
2.9
300
0.75
3.0
24
3.0
V
V
mV
μA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage Regulation
Range
V
OUT-REG
1.5
7.5
V
OUTPUT VOLTAGE ACCURACY
V
OUT-REG
= 1.8V, 1.8V
factory-default
version
V
SUP
= 12V,
I
OUT
= 250mA,
T
A
= +25°C
V
SUP
= 4.5V to 24V,
I
OUT
= 0mA to 500mA,
T
A
= -40°C to +85°C
V
SUP
= 12V,
I
OUT
= 250mA,
T
A
= +25°C
V
SUP
= 4.5V to 24V,
I
OUT
= 0mA to 500mA,
T
A
= -40°C to +85°C
V
SUP
= 12V,
I
OUT
= 250mA,
T
A
= +25°C
V
SUP
= 6V to 24V, I
OUT
= 0mA to 500mA, T
A
=
-40°C to +85°C
1.78
1.8
1.82
1.746
1.8
1.854
OUT Voltage Accuracy
V
OUT
V
OUT-REG
= 3.3V, 3.3V
factory-default
version
3.27
3.3
3.33
V
3.2
3.3
3.4
V
OUT-REG
= 5.0V, 5.0V
factory-default
version
4.95
5
5.05
4.85
5
5.15
www.maximintegrated.com
Maxim Integrated
│
3
MAX77756
24V Input, 500mA Buck Regulator
with Dual-Input Power MUX
Electrical Characteristics (continued)
PARAMETER
FB VOLTAGE ACCURACY
SYMBOL
(V
SUP
= V
EN
= 12V, V
IO
= 1.8V, V
IN1
= V
IN2
= 0V, configuration registers in reset. Limits are 100% production tested at T
A
= +25°C,
limits over T
A
= -40°C to +85°C are guaranteed by design and characterization, unless otherwise noted.)
CONDITIONS
V
SUP
= 12V,
I
LOAD
= 250mA,
T
A
= +25°C
V
SUP
= 3.0V to 24V,
I
LOAD
= 0mA to 500mA,
T
A
= -40°C to +85°C
MIN
TYP
MAX
UNITS
FB Voltage Accuracy
V
FB
External
feedback
version
0.99
1
1.01
V
0.97
1
0.02
99
1
0.02
4
8
500
500
700
800
1.03
µA
%
%
%/V
SUP
ms
800
800
mΩ
mΩ
FB Input Current
OUT/FB Wake-Up
Threshold
OUT/FB Load Regulation
OUT/FB Line Regulation
OUT/FB Soft-Start Ramp
Time
High-Side MOSFET
On-Resistance
Low-Side MOSFET
On-Resistance
I
FB
V
WAKE
V
FB
= 1V, external feedback version
Standby mode exit threshold,
I
LOAD
= 0mA, expressed as a
percentage of V
OUT-REG
0 to 300mA load, FPWM mode (Note 2)
V
SUP
= 4.5V to 24V, V
OUT
= 3.3V,
FPWM mode (Note 2)
t
SS
R
ON-HS
R
ON-LS
SOFT_ST = 1
SOFT_ST = 0
V
BIAS
= 5V, I
LX
= 90mA
V
BIAS
= 5V, I
LX
= 90mA
I_PEAK[1:0] = 0b00
High-Side MOSFET Peak
Current Limit
I
LX-PEAK
I_PEAK[1:0] = 0b01
I_PEAK[1:0] = 0b10
I_PEAK[1:0] = 0b11
Output overloaded (V
OUT
< 25% of V
OUT-
REG
), threshold below where
on-times are allowed to start
Inductor current ramps to at least
I
LX-PK-MIN
while skipping
800
900
1000
500
1000
mA
Low-Side MOSFET Valley
Current Threshold
High-Side MOSFET
Minimum Current
Threshold
Low-Side MOSFET
Zero-Crossing Threshold
Minimum On-Time (Note 3)
Maximum Duty Cycle
Switching Frequency
Spread-Spectrum
Frequency Range
I
LX-VALLEY
mA
I
LX-PK-MIN
I
ZX
t
ON-MIN
D
MAX
f
SW
∆f
SW
200
mA
40
V
OUT
= 3.3V
Continuous conduction
Spread-spectrum enabled
0.94
80
99
1
±6
1.06
mA
ns
%
MHz
%
www.maximintegrated.com
Maxim Integrated
│
4
MAX77756
24V Input, 500mA Buck Regulator
with Dual-Input Power MUX
Electrical Characteristics (continued)
(V
SUP
= V
EN
= 12V, V
IO
= 1.8V, V
IN1
= V
IN2
= 0V, configuration registers in reset. Limits are 100% production tested at T
A
= +25°C,
limits over T
A
= -40°C to +85°C are guaranteed by design and characterization, unless otherwise noted.)
解决方法：使用“异或”(xor)逻辑。示例如下： process (CLK) begin if rising_edge(CLK) then SIG_RISE_OUT <= SIG_FALL_OUT xor D_IN0; end if; end process; process (CLK) ......
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