參數(shù)資料
型號(hào)： MAX1549ETL+T
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Dual, Interleaved, Fixed-Frequency Step-Down Controller with a Dynamically Adjustable Output
中文描述： 3 A DUAL SWITCHING CONTROLLER, 450 kHz SWITCHING FREQ-MAX, QCC40
封裝： 6 X 6 MM, 0.80 MM HEIGHT, MO-220WJJD-2, TQFN-40
文件頁(yè)數(shù)： 33/35頁(yè)
文件大?。?/td> 933K
代理商： MAX1549ETL+T
MAX1549
Dual, Interleaved, Fixed-Frequency Step-Down
Controller with a Dynamically Adjustable Output
_______________________________________________________________________________________
7
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VCC = VDD = 5V, SKIP = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
INPUTS AND OUTPUTS
OD_ On-Resistance
ROD_
100
ON_ Logic Input Threshold
Rising edge, hysteresis = 600mV
2.4
2.8
V
High
2.4
Logic Input Voltage
SKIP, G0, G1, hysteresis =
600mV
Low
0.8
V
High
1.9
2.1
Dual-Mode Threshold Voltage
FB2
Low
0.05
0.15
V
High
VCC - 0.4V
Open
3.15
3.85
REF
1.65
2.35
Four-Level Input Logic Levels
FSEL, FBLANK
Low
0.5
V
Note 1: When the inductor is in continuous conduction, the output voltage has a DC regulation level lower than the error-comparator
threshold by 50% of the ripple. In discontinuous conduction (SKIP = GND, light load), the output voltage has a DC regula-
tion level higher than the trip level by approximately 1.5% due to slope compensation.
Note 2: The MAX1549 cannot operate over all combinations of frequency, input voltage (VIN), and output voltage. For large input-to-
output differentials and high switching-frequency settings, the required on-time may be too short to maintain the regulation
specifications. Under these conditions, a lower operating frequency must be selected. The minimum on-time must be
greater than 150ns, regardless of the selected switching frequency. On-time and off-time specifications are measured from
the 50% point to the 50% point at the DH_ pin with LX_ = GND, VBST_ = 5V, and a 250pF capacitor connected from DH_ to
LX_. Actual in-circuit times may differ due to MOSFET switching speeds.
Note 3: Specifications are guaranteed by design, not production tested.
Note 4: Specifications to -40
°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(MAX1549 circuit of Figure 1, VIN = 12V, VDD = VCC = 5V, SKIP = GND, FSEL = open, TA = +25°C, unless otherwise noted.)
OUT1 EFFICIENCY vs. LOAD CURRENT
(VOUT1 = 1.0V)
MAX1549
toc01
LOAD CURRENT (A)
EFFICIENCY
(%)
1
0.1
60
70
80
90
100
50
0.01
10
SKIP = GND
SKIP = VCC
VIN = 5V
VIN = 12V
VIN = 20V
1.0V OUTPUT VOLTAGE (OUT1)
vs. LOAD CURRENT
MAX1549
toc02
LOAD CURRENT (A)
OUTPUT
VOLTAGE
(V)
6
5
4
3
2
1
0.99
1.00
1.01
1.02
1.03
1.04
1.05
0.98
07
SKIP = GND
SKIP = VCC
OUT2 EFFICIENCY vs. LOAD CURRENT
(VOUT2 = 2.5V)
MAX1549
toc03
LOAD CURRENT (A)
EFFICIENCY
(%)
1
0.1
60
70
80
90
100
50
0.01
10
SKIP = GND
SKIP = VCC
VIN = 5V
VIN = 12V
VIN = 20V
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