MAX1970 データシートの表示（PDF） - Maxim Integrated
部品番号
コンポーネント説明
メーカー
MAX1970
Maxim Integrated
MAX1970 Datasheet PDF : 21 Pages
| |||
Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-
Down Regulator with POR and RSI/PFO
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VCC = VEN = 5V, VFB1 = VFB2 = 1.15V, R POR = 100kΩ to IN, RPFO = 100kΩ to IN, RSI = 0, CVCC = 0.1µF, CREF = 0.1µF,
FBSEL1 = unconnected, FBSEL2 = unconnected, TA = -40°C to +85°C.) (Note 2)
PARAMETER
FB1 Input Resistance
FB2 Input Resistance
FB_ Input Bias Current
COMP1 AND COMP2
CONDITIONS
Measured from FB1 to
GND
Measured from FB2 to
GND
FBSEL1 = GND
FBSEL1 = VCC
FBSEL2 = GND
FBSEL2 = VCC
FB1 or FB2, FBSEL_ = unconnected, VFB1 = VFB2 = 1.15V
MIN
TYP MAX UNITS
30
120
kΩ
30
120
22.5
90
kΩ
22.5
90
0.1
µA
COMP1
FB1 = COMP1,
FBSEL1 = unconnected
35
Transconductance
VCOMP1 = 1.2V
85
µS
COMP2
Transconductance
FB2 = COMP2,
VCOMP2 = 1.2V
FBSEL2 = unconnected
35
LX1 AND LX2
Internal High-Side
MOSFET On-Resistance
Internal Low-Side
MOSFET On-Resistance
ILX = -180mA
ILX = 180mA
VIN = 5.0V
VIN = 3.3V
VIN = 5.0V
VIN = 3.3V
LX_ Current-Sense
0.4
Transresistance
85
µS
0.32
Ω
0.37
0.23
Ω
0.25
0.6
V/A
LX_ Current-Limit
Duty cycle = 100%,
High side
0.76
Threshold
VIN = 2.6V to 5.5V
Low side
-1.6
LX_ Leakage Current
VIN = 5.5V
VLX1 = VLX2 = 5.5V
VLX1 = VLX2 = 0
-20
MAX1970/MAX1972
1.2
LX_ Switching Frequency VIN = 2.6V to 5.5V
MAX1971
0.60
LX_ Minimum Duty Cycle
POR
VIN = 2.6V to 5.5V
MAX1970/MAX1972
MAX1971
POR Thresholds
POR Delay Time (TD)
POR Output Current, High
Percentage of VOUT,
VIN = 2.6V to 5.5V
VOUT rising
VOUT falling
MAX1970
MAX1971/MAX1972
V POR = VIN = 5.5V, VFB1 = VFB2 = 1.15V
87
13.3
140
-1
POR Output Voltage, Low
POR Start-Up Voltage
VFB1 = 1.05V or VFB2 = 1.05V or RSI = IN (MAX1971 only),
I POR = 1mA
FB1 = FB2 = GND, IPOR = 100µA, VIN = 1.2V
1.60
-0.40
20
1.6
0.80
20
15
A
µA
MHz
%
94
%
20
ms
210
1
µA
0.05
V
0.05
V
_______________________________________________________________________________________ 5
Share Link: