MAX1831 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
MAX1831 Datasheet PDF : 13 Pages
| |||
3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VCC = +3.3V, FBSEL = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 5)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Adjustable Output Voltage Range
VCC = VIN = +3V to +5.5V, ILOAD = 0, FBSEL
= GND
VREF
VIN
V
Reference Voltage
Current-Limit Threshold
Idle Mode Current Threshold
PMOS Switch On-Resistance
NMOS Switch On-Resistance
No-Load Supply Current
FB Input Bias Current
Off-Time
VREF
ILIMIT
IIM
RON, P ILX = 0.5A
RON, N ILX = 0.5A
IIN + ICC
IFB
tOFF
VFB = 1.2V
VFB = 1.2V
RTOFF = 110kΩ
VIN = 4.5V
VIN = +3V
VIN = 4.5V
VIN = +3V
1.078
3.9
0.14
0
0.8
1.122
V
5.4
A
1.0
A
90
110
mΩ
95
100
750
µA
360
nA
1.2
µs
Note 2: Not production tested.
Note 3: Soft-start time is measured with respect to the number of cycles on LX.
Note 4: This is a metal migration limit. Maximum output current may be limited by thermal capability to a lower value than this.
Note 5: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 5.0V, L = 1.5µH)
100
95 VOUT = 3.3V
90 RTOFF = 39kΩ
85
80
75
VOUT = 1.8V
RTOFF = 75kΩ
70
VOUT = 1.5V
65
RTOFF = 82kΩ
60
55
50
0.001 0.01
0.1
1
10
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
(VIN = 3.3V, L = 1.5µH)
100
95
90
85
80
VOUT = 1.5V
75
VOUT = 2.5V RTOFF = 62kΩ
70
RTOFF = 39kΩ
65
VOUT = 1.8V
60
RTOFF = 51kΩ
55
50
0.001 0.01
0.1
1
10
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
(fPWM = 300kHz)
100
95
90
85
VOUT = 1.8V
80
VIN = 3.3V
RTOFF = 160kΩ
75
L = 2.5µH
70
VOUT = 1.8V
65
VIN = 5.0V
RTOFF = 220kΩ
60
L = 5.2µH
55
50
0.001 0.01
0.1
1
10
OUTPUT CURRENT (A)
4 _______________________________________________________________________________________
Share Link: 