MAX15026B/CETD+, MAX15026BETD/V+.......-40°C to +85°C
MAX15026B/C/DATD+ ...................................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1:
Dissipation wattage values are based on still air with no heatsink. Actual maximum power dissipation is a function of heat
extraction technique and may be substantially higher. 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 consid-
erations, refer to
www.maximintegrated.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
(V
IN
= 12V, R
RT
= 27kΩ, R
LIM
= 30kΩ, C
VCC
= 4.7µF, C
IN
= 1µF, T
A
= -40°C to +85°C (MAX15026B/CETD+, MAX15026BETD/V+),
T
A
= T
J
= -40°C to +125°C (MAX15026B/C/DATD+), unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
GENERAL
Input Voltage Range
Quiescent Supply Current
Shutdown Supply Current
Enable to Output Delay
V
CC
High to Output Delay
V
CC
REGULATOR
Output Voltage
V
CC
Regulator Dropout
V
CC
Short-Circuit Output Current
V
CC
Undervoltage Lockout
V
CC
Undervoltage Lockout
Hysteresis
ERROR AMPLIFIER (FB, COMP)
FB Input Voltage Set-Point
FB Input Bias Current
FB to COMP Transconductance
Amplifier Open-Loop Gain
Amplifier Unity-Gain Bandwidth
V
COMP-RAMP
Minimum Voltage
COMP Source/Sink Current
2
SYMBOL
CONDITIONS
MIN
4.5
TYP
MAX
28
5.5
UNITS
V
IN
V
IN
= V
CC
= V
DRV
V
FB
= 0.9V, no switching
EN = GND
EN = V
CC
6V < V
IN
< 28V, I
LOAD
= 25mA
V
IN
= 12V, 1mA < I
LOAD
< 70mA
V
IN
= 4.5V, I
LOAD
= 70mA
V
IN
= 5V
4.5
1.75
290
480
375
V
mA
µA
µs
µs
2.75
500
I
IN_SBY
V
CC
5.0
5.25
5.5
0.28
V
V
mA
V
mV
100
3.8
200
4.0
400
300
4.2
V
CC_UVLO
V
CC
rising
V
FB
I
FB
g
M
V
FB
= 0.6V
I
COMP
= ±20µA
Capacitor from COMP to GND = 50pF
I
COMP
V
COMP
= 1.4V
585
-250
600
591
1200
80
4
160
597
+250
1800
mV
nA
µS
dB
MHz
mV
50
80
110
µA
Maxim Integrated
MAX15026
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, R
RT
= 27kΩ, R
LIM
= 30kΩ, C
VCC
= 4.7µF, C
IN
= 1µF, T
A
= -40°C to +85°C (MAX15026B/CETD+, MAX15026BETD/V+),
T
A
= T
J
= -40°C to +125°C (MAX15026B/C/DATD+), unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
ENABLE (EN)
EN Input High
EN Input Low
EN Input Leakage Current
OSCILLATOR
Switching Frequency
1MHz Switching Frequency
2MHz Switching Frequency
Switching Frequency Adjustment
Range (Note 3)
RT Voltage
PWM Ramp Peak-to-Peak
Amplitude
PWM Ramp Valley
Minimum Controllable On-Time
Maximum Duty Cycle
Minimum Low-Side On-Time
OUTPUT DRIVERS/DRIVER SUPPLY (DRV)
DRV Undervoltage Lockout
DRV Undervoltage Lockout
Hysteresis
DH On-Resistance
DL On-Resistance
DH Peak Current
DL Peak Current
DH/DL Break-Before-Make Time
DL/DH Break-Before-Make Time
SOFT-START
Soft-Start Duration
Reference Voltage Steps
CURRENT LIMIT/HICCUP
Current-Limit Threshold
Adjustment Range
Cycle-by-cycle valley current-limit
threshold adjustment range
valley limit = V
LIM
/10
30
300
mV
2048
64
Switching
Cycles
Steps
Low, sinking 100mA, V
BST
= 5V
High, sourcing 100mA, V
BST
= 5V
Low, sinking 100mA, V
BST
= 5.2V
High, sourcing 100mA, V
BST
= 5.2V
C
LOAD
= 10nF
C
LOAD
= 10nF
Sinking
Sourcing
Sinking
Sourcing
V
DRV_UVLO
V
DRV
rising
4.0
4.2
400
1
1.5
1
1.5
4
3
4
3
10 (18, Note 5)
10 (20, Note 6)
3
4.5
3
4.5
4.4
V
mV
Ω
Ω
A
A
ns
ns
f
SW
= 600kHz
R
RT
= 15.7kΩ
85
75
V
RT
V
RAMP
V
VALLEY
f
SW
R
RT
= 27kΩ
R
RT
= 15.7kΩ
R
RT
= 7.2kΩ
540
0.9
1.8
200
1.19
1.205
1.8
0.8
65
88
110
150
100
600
1
2.0
660
1.1
2.4
2000
1.22
kHz
MHz
MHz
kHz
V
V
V
ns
%
ns
V
EN_H
V
EN_L
I
LEAK_EN
V
EN
rising
V
EN
falling
V
EN
= 5.5V
1.14
0.997
-1
1.20
1.05
1.26
1.103
+1
V
V
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DH at 1V (falling) to DL at 1V (rising)
DL at 1V (falling) to DH at 1V (rising)
Maxim Integrated
3
MAX15026
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, R
RT
= 27kΩ, R
LIM
= 30kΩ, C
VCC
= 4.7µF, C
IN
= 1µF, T
A
= -40°C to +85°C (MAX15026B/CETD+, MAX15026BETD/V+),
T
A
= T
J
= -40°C to +125°C (MAX15026B/C/DATD+), unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
LIM Reference Current
LIM Reference Current Tempco
Number of Consecutive Current-
Limit Events to Hiccup
Soft-Start Timeout
Soft-Start Restart Timeout
Hiccup Timeout
Peak Low-Side Sink Current
Limit
BOOST
Boost Switch Resistance
POWER-GOOD OUTPUT
PGOOD Threshold Rising
PGOOD Threshold Falling
PGOOD Output Leakage
PGOOD Output Low Voltage
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Temperature rising
Temperature falling
+150
20
°C
°C
I
LEAK_PGD
V
PGOOD_L
V
IN
= V
PGOOD
= 28V, V
EN
= 5V, V
FB
= 1V
I
PGOOD
= 2mA, EN = GND
90
88
-1
94.5
92
97.5
94.5
+1
0.4
%V
FB
%V
FB
µA
V
V
IN
= V
CC
= 5V, I
BST
= 10mA
3
8
Ω
Out of soft-start
Sink limit = 1.5V, R
LIM
= 30kΩ (Note 4)
SYMBOL
I
LIM
CONDITIONS
V
LIM
= 0.3V to 3V (Note 4)
V
LIM
= 0.3V to 3V
MIN
45
TYP
50
2300
7
4096
8192
4096
75
MAX
55
UNITS
µA
ppm/°C
Events
Switching
Cycles
Switching
Cycles
Switching
Cycles
mV
Note 2:
All devices are 100% tested at room temperature and guaranteed by design over the specified temperature range.
Note 3:
Select R
RT
as:
R
RT
=
17.3
×
10
9
f
SW
+
(1x10
−
7
)x(f
SW 2
)
where f
SW
is in Hertz.
Note 4:
T
A
= +25°C.
Note 5:
10ns for MAX15026B, 18ns for the MAX15026C/D.
Note 6:
10ns for MAX15026B, 20ns for the MAX15026C/D.
4
Maxim Integrated
MAX15026
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
Typical Operating Characteristics
(V
IN
= 12V, T
A
= +25°C. The following TOCs are for MAX15026B/C/D, unless otherwise noted.) (See the circuit of Figure 5.)
当今的计算机外部设备，都在追求高速度和高通用性。为了满足用户的需求，以Intel为首的七家公司于1994年推出了USB（Universal Serial Bus，通用串行总线）总线协议，专用于低、中速的计算机外设。目前，USB端口已成为微机主板的标准端口；而在不久的将来，所有的微机外设，包括键盘、鼠标、显示器、打印机、数字相机、扫描仪和游戏柄等等，都将通过USB与主机相连。
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