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参数资料
| 型号： | LTC3731CUH#TR |
| 厂商： | Linear Technology |
| 文件页数： | 3/34页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 32-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 750kHz |
| 占空比： | 98.5% |
| 电源电压： | 4 V ~ 36 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3731
ORDER INFORMATION
LEAD FREE FINISH
LTC3731CG#PBF
LTC3731IG#PBF
LTC3731CUH#PBF
LTC3731IUH#PBF
TAPE AND REEL
LTC3731CG#TRPBF
LTC3731IG#TRPBF
LTC3731CUH#TRPBF
LTC3731IUH#TRPBF
PART MARKING
LTC3731CG
LTC3731IG
3731
3731I
PACKAGE DESCRIPTION
36-Lead Plastic SSOP
36-Lead Plastic SSOP
32-Lead (5mm × 5mm) Plastic QFN
32-Lead (5mm × 5mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperatur e range, otherwise specifications are at T A = 25°C. V CC = V RUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loop
V REGULATED Regulated Voltage at IN +
V ITH = 1.2V (Note 3)
LTC3731I
l
l
0.596
0.594
0.591
0.600
0.600
0.604
0.606
0.609
V
V
V
V SENSEMAX
I MATCH
V LOADREG
Maximum Current Sense Threshold
Maximum Current Threshold Match
Output Voltage Load Regulation
V EAIN = 0.5V, V ITH Open,
V SENSE1– , V SENSE2– , V SENSE3– = 0.6V, 1.8V
LTC3731I
Worst-Case Error at V SENSEMAX
(Note 3)
Measured in Servo Loop, ?I TH Voltage = 1.2V to 0.7V
LTC3731I
Measured in Servo Loop, ?I TH Voltage = 1.2V to 2V
LTC3731I
l
l
l
l
l
l
65
62
60
–5
75
75
0.1
0.1
–0.1
–0.1
85
88
90
5
0.5
0.7
–0.5
–0.7
mV
mV
mV
%
%
%
%
%
V REFLNREG
Output Voltage Line Regulation
V CC = 4.5V to 7V
0.03
%/V
g m
Transconductance Amplifier g m
I TH = 1.2V, Sink/Source 25μA (Note 3)
LTC3731I
l
l
4
3
5
5
6
7
mmho
mmho
g mOL
Transconductance Amplifier GBW
I TH = 1.2V (g m ? Z L , Z L = Series 1k-100kΩ-1nF)
3
MHz
V FCB
I FCB
Forced Continuous Threshold
FCB Bias Current
LTC3731I
V FCB = 0.65V
l
l
0.58
0.54
0.60
0.60
0.2
0.62
0.66
0.7
V
V
μA
V BINHIBIT
Burst Inhibit Threshold
Measured at FCB Pin
V CC – 1.5 V CC – 0.7 V CC – 0.3
V
UVR
Undervoltage RUN/SS Reset
V CC Lowered Until the RUN/SS Pin is Pulled Low
3.3
3.8
4.5
V
UVADJ
I UVADJ
I Q
Undervoltage Lockout Threshold
Undervoltage Bias Current
Input DC Supply Current
Normal Mode
Shutdown
At UVADJ Threshold
(Note 4)
V CC = 5V
V RUN/SS = 0V
1.13
1.18
0.2
2.3
50
1.23
50
3.5
100
V
nA
mA
μA
I RUN/SS
Soft-Start Charge Current
V RUN/SS = 1.9V
–0.8
–1.5
–2.5
μA
3731fc
3
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