參數(shù)資料
型號(hào)： MAX887HESA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter
中文描述： 1.5 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, SOP-8
文件頁(yè)數(shù)： 2/12頁(yè)
文件大?。?/td> 146K
代理商： MAX887HESA
M
100% Duty Cyc le, Low-Noise,
S tep-Down, PWM DC-DC Converter
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
REF, FB, SYNC, VL to GND..................................... -0.3V to +6V
V+ to GND............................................................. -0.3V to +12V
SHDN
, LX to GND ....................................... -0.3V to (V+ + 0.3V)
PGND to GND ...................................................... -0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 9.09mW/°C above +70°C) .........................471mW
ELECTRICAL CHARACTERISTICS
(V+ = +7V, PGND = GND = 0V,
SHDN
= V+,
(T
A
= 0°C to T
MAX
)
, unless otherwise noted.)
SYMBOL
PARAMETER
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.
Operating Temperature Ranges
MAX887HC/D.......................................................0°C to +70°C
MAX887HESA...................................................-40°C to +85°C
Storage Temperature Range ........................... -65°C to +165°C
Lead Temperature (soldering, 10sec) ............................ +300°C
SYNC = GND or 3V
I
OUT
= 0mA, SYNC = GND
V+ rising
I
OUT
= 0mA, SYNC = 3.0V
V+ falling
V+ = floating, LX = 5V,
SHDN
= GND
V+ = 12V, LX = GND to 12V
I
LX
= ±100mA
SYNC = 3.0V
FB = 1.30V
SYNC = 3.0V, PWM duty cycle = 50%
SHDN
= GND
Circuit of Figure 2
I
OUT
= 0mA to 500mA
V
IN
= 4V to 11V, PWM mode
SYNC = 3.0V, FB = 1.18V
CONDITIONS
V
V
2.4
V
IH,
SHDN
V
IL,
SHDN
I
IN-,
SHDN
C
IN,
SHDN
V
L
V
REF
SHDN
Input High Voltage
SHDN
Input Low Voltage
SHDN
Input Current, Sinking
SHDN
Input Capacitance
VL Output Voltage
REF Output Voltage
μA
±1
I
IN, SYNC
SYNC Input Current
V
0.5
V
IL, SYNC
SYNC Input Low Voltage
V
2.5
V
IH, SYNC
SYNC Input High Voltage
V
3.1
3.5
V
+, START
Startup Voltage
V
3.0
3.3
V
+, UVLO
Undervoltage Lockout
μA
1.0
20
I
LXLKGR
LX Reverse Leakage Current,
Regulator Off
μA
-10
1.0
10
I
LXLKG
LX Leakage Current
0.6
R
ON, LX
LX On-Resistance
A
0.75
1.0
1.40
I
LIM+
High-Side Current Limit
kHz
260
300
340
f
OSC
PWM Switching Frequency
%
100
PWM, DUTY
PWM Maximum Duty Cycle
mA
0.2
0.5
I
V+, PFM
Quiescent Supply Current
(PFM Mode)
mA
2.7
4.0
I
V+, PWM
V
3.5
11.0
V+
Supply Range
Quiescent Supply Current
(PWM Mode)
ns
500
SYNC, PW
SYNC Pulse Width High or Low
kHz
25
440
f
SYNC
SYNC Frequency
μA
±0.10
I
FB
FB Input Current
V
1.225
1.250
1.275
V
FB
PWM FB Feedback Threshold
μA
V
2.5
5
I
V+, SHDN
V
OUT, RANGE
Shutdown Supply Current
Output Voltage Range
Load Regulation
Line Regulation
1.25
10.50
%/mA
%/V
0.005
0.2
UNITS
MIN
TYP
MAX
0.8
±1
10
SHDN
= GND or V+
(Note 1)
I
VL
= 0mA to 1mA
0μA to 30μA
μA
pF
V
V
3.3
1.25
Note 1:
Guaranteed by design and not production tested.
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