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.
Note 1:
Junction temperature greater than +125°C
degrades operating lifetimes.
Package Information
PACKAGE TYPE: 10 TDFN
Package Code
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Continuous Power Dissipation (T
A
= +70°C)
(derate 14.9mW/°C above +70°C)
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
PACKAGE TYPE: 10
µMAX
Package Code
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Continuous Power Dissipation (T
A
= +70°C)
(derate 8.8mW/°C above +70°C)
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
707.3mW
113.1°C/W
42°C/W
U10+5
21-0061
90-0330
1188.7mW
67.3°C/W
18.2°C/W
T1032N+1
21-0429
90-0082
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
│
3
MAX17552/MAX17552A
60V, 100mA, Ultra-Small, High-Efficiency
Synchronous Step-Down DC-DC Converter
with 22µA No-Load Supply Current
Electrical Characteristics
(V
IN
= 24V, V
GND
= 0V, V
VOUT
= 3.3V, V
FB
= 0.85V, V
EN/UVLO
= 1.5V, RT/SYNC = 191kΩ, LX = SS = MODE =
RESET
= unconnected;
T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are referenced to GND, unless otherwise
noted) (Note 2)
PARAMETER
INPUT SUPPLY (IN)
Input Voltage Range
Input Shutdown Current
Input Supply Current
EXTERNAL BIAS (V
OUT)
V
OUT
Switchover Threshold
ENABLE/UVLO (EN/UVLO)
V
ENR
EN/UVLO Threshold
EN/UVLO Leakage Current
POWER MOSFETs
High-Side pMOS On-Resistance
Low-Side nMOS On-Resistance
LX Leakage Current
SOFT-START (SS)
Soft-Start Time
SS Charging Current
FEEDBACK (FB)
FB Regulation Voltage
FB Input Leakage Current
CURRENT LIMIT
Peak Current-Limit Threshold
Negative Current-Limit Threshold
PFM Current Level
OSCILLATOR (RT/SYNC)
R
RT
= 422kΩ
R
RT
= 191kΩ
Switching Frequency
f
SW
R
RT
= 130kΩ
R
RT
= 69.8kΩ
R
RT
= 45.3kΩ
R
RT
= 19.1kΩ
90
205
295
540
813
1.86
100
220
319
592
900
2.08
111
235
340
638
973
2.3
MHz
kHz
I
PEAK-LIMIT
I
SINK-LIMIT
I
PFM
V
MODE
= GND
V
MODE
= unconnected
V
MODE
= unconnected
50
185
79
210
105
0.01
72
90
235
130
mA
mA
mA
V
FB-REG
I
FB
MODE = GND
MODE = unconnected
V
FB
= 1V, T
A
= 25°C
0.786
0.786
-100
0.8
0.812
0.814
0.826
+100
V
nA
t
SS
I
SS
SS = unconnected
4.4
4.7
5.1
5
5.8
5.3
ms
µA
R
DS-ONH
R
DS-ONL
I
LX-LKG
I
LX
= 0.1A (sourcing)
I
LX
= 0.1A (sinking)
V
EN
= 0V, T
A
= +25°C,
V
LX
= (V
GND
+ 1V) to (V
IN
- 1V)
1.5
0.8
-1
2.7
1.4
5.1
2.6
+1
Ω
Ω
µA
V
ENF
V
EN-TRUESD
I
EN
V
EN/UVLO
rising
V
EN/UVLO
falling
V
EN/UVLO
falling, true shutdown
V
EN/UVLO
= 1.3V, T
A
= +25°C
-100
1.2
1.1
1.25
1.15
0.7
+100
nA
1.3
1.2
V
2.96
3.05
3.12
V
V
IN
I
IN-SH
I
Q-PFM
I
Q-PWM
V
EN/UVLO
= 0V, T
A
= +25°C
V
MODE
= unconnected (Note 3)
Normal switching mode, V
IN
= 24V
245
4
0.67
1.2
18
525
60
2.25
32
760
µA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
4
MAX17552/MAX17552A
60V, 100mA, Ultra-Small, High-Efficiency
Synchronous Step-Down DC-DC Converter
with 22µA No-Load Supply Current
Electrical Characteristics (continued)
(V
IN
= 24V, V
GND
= 0V, V
VOUT
= 3.3V, V
FB
= 0.85V, V
EN/UVLO
= 1.5V, RT/SYNC = 191kΩ, LX = SS = MODE =
RESET
= unconnected;
T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are referenced to GND, unless otherwise
noted) (Note 2)
PARAMETER
Switching Frequency Adjustable
Range
SYNC Input Frequency
SYNC Pulse Minimum Off-Time
SYNC Rising Threshold
Hysteresis
Number of SYNC Pulses to
Enable Synchronization
TIMING
Minimum On-Time
t
ON-MIN
D
MAX
f
SW
≤ 600kHz,
V
FB
= 0.98 x V
FB-REG
f
SW
> 600kHz,
V
FB
= 0.98 x V
FB-REG
MAX17552A
V
FB-OKR
V
FB-OKF
V
FB
rising
V
FB
falling
93
90
46
90
87
82
94
92
51
95
92
2.1
I
RESET
= 1mA
V
FB
= 1.01 x V
FB-REG
,
T
A
= +25°C
V
MODE-PFM
V
MODE-HYS
V
MODE
= unconnected
(MAX17552)
V
MODE
= unconnected
(MAX17552A)
V
MODE
= GND
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Temperature rising
160
20
°C
°C
1
1.22
0.19
235
123
1390
kΩ
0.23
1
1.44
97
94
ms
%
%
ms
V
µA
V
V
128
98
%
ns
V
SYNC-H
V
SYNC-HYS
SYMBOL
CONDITIONS
See the Switching Frequency (RT/
SYNC) section for details
MIN
100
1.1 x f
SW
40
1
0.115
1.22
0.18
1
1.44
0.265
TYP
MAX
2200
2200
UNITS
kHz
kHz
ns
V
Cycles
Maximum Duty Cycle
RESET
Hiccup Timeout
FB Threshold for
RESET
Rising
FB Threshold for
RESET
Falling
RESET
Delay after FB Reaches
95% Regulation
RESET
Output Level Low
RESET
Output Leakage Current
MODE
MODE PFM Threshold
MODE Hysteresis
MODE Internal Pullup Resistor
Note 2:
Limits are 100% tested at TA = +25°C. Limits over the operating temperature range and relevant supply voltage range are
guaranteed by design and characterization.
Note 3:
Actual I
Q-PFM
in the application circuit is higher due to additional current in the output voltage feedback resistor divider. For
据国外媒体报道，英特尔将处理器价格最高下调31%，但降价整体来说是有限的。 根据英特尔7月20日的新定价单来看，Core 2 Duo E8500(3.16GHz)价格降幅最高，从266美元下调至183美元，降幅达31%；Core 2 Duo E7200 (2.53GHz)次之，从133美元下调至113美元，降幅15%。 其他降价处理器还有四核Q6600(2.4GHz)，从224美...[详细]
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