MAX8833(2007) 查看數據表（PDF） - Maxim Integrated
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MAX8833 Datasheet PDF : 21 Pages
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Dual, 3A, 2MHz Step-Down Regulator
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VVDD = VVDL = 3.3V, VFB = 0.5V, VSS_ = VREFIN = 600mV, PGND_ = GND, RFSYNC = 10kΩ, L = 0.47µH, CBST_ = 0.1µF, CSS =
0.022µF, PWRGD not connected; TA = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
FSYNC
FSYNC Capture Range
FSYNC Input Threshold
250
2500 kHz
1.3
1.5
1.7
V
FSYNC Output Voltage
Phase Shift from LX1 to LX2
PWRGD1, PWRGD2
0.975 1.0 1.025
V
180
Degrees
PWRGD1 Threshold Voltage
VFB1 rising with respect to VREFIN,
and VREFIN > 540mV typ
88
90
92
%
PWRGD2 Threshold Voltage
PWRGD_ Hysteresis
PWRGD_ Falling Edge Deglitch
PWRGD_ Output-Low Voltage
PWRGD_ Leakage Current
VFB2 rising with respect to VSS2,
and VSS2 > 540mV typ
IPWRGD_ = 4mA
VPWRGD = 3.6V,
VFB_ = 0.9V
TA = +25°C
TA = +85°C
88
90
92
%
2.6
%
35
45
55
µs
0.03 0.15
V
1
µA
0.01
Note 2: All devices 100% production tested at +25°C. Limits over temperature are guaranteed by design.
Note 3: VVDD must equal VVDL and be equal to or greater than VIN_.
Typical Operating Characteristics
(VIN1 = VIN2 = 3.3V. MAX8833, circuit of Figure 6, TA = +25°C, unless otherwise noted.)
EFFICIENCY
vs. LOAD CURRENT WITH 3.3V INPUT
100
90
80
70
VOUT = 1.2V
VOUT = 2.5V
60
VOUT = 1.8V
50
40
30
20
10
0
100
1000
LOAD CURRENT (mA)
10,000
EFFICIENCY
vs. LOAD CURRENT WITH 2.5V INPUT
100
90
80
70
VOUT = 1.2V
60
VOUT = 1.8V
50
40
30
20
10
0
100
1000
LOAD CURRENT (mA)
10,000
SWITCHING FREQUENCY vs. RFSYNC
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
3
6
9
12 15 18 21
RFSYNC (kΩ)
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