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参数资料
| 型号： | LTC3709EUH#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/24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： | 200kHz |
| 占空比： | 90% |
| 电源电压： | 5 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： | -40°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC3709
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25 ° C. V CC = DRV CC = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loop
I Q
Input DC Supply Current
Normal
Shutdown
2.4
25
3
65
mA
μ A
I FB
FB Pin Input Current
I TH = 1.2V (Note 3)
– 35
– 60
nA
V FB
Feedback Voltage
I TH = 1.2V (Note 3)
●
0.594
0.600
0.606
V
? V FB(LINEREG)
Feedback Voltage Line Regulation
V CC = 4.5V to 6.5V (Note 3)
0.02
%/V
? V FB(LOADREG)
Feedback Voltage Load Regulation
I TH = 0.5V to 2V (Note 3)
– 0.12
– 0.2
%
g m(EA)
t ON
t ON(MIN)
t OFF(MIN)
V SENSE(MAX)
V SENSE(MIN)
Error Amplifier Transconductance
On-Time
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold
Minimum Current Sense Threshold
I TH = 1.2V (Note 3)
I ON = 180 μ A, V FCB = 0V
I ON = 90 μ A, V FCB = 0V
I ON = 540 μ A
I ON = 90 μ A
V RNG = 1V
V RNG = 0V
V RNG = V CC
V RNG = 1V
1.3
90
180
124
86
177
1.45
116
233
45
250
144
101
202
– 60
1.6
140
280
100
350
166
119
234
mS
ns
ns
ns
ns
mV
mV
mV
mV
V RNG = 0V
V RNG = V CC
– 40
– 80
mV
mV
? V FB(OV)
? V FB(UV)
Overvoltage Fault Threshold
Undervoltage Fault Threshold
8.5
– 8.5
10
– 10
12.5
– 12.5
%
%
V RUN/SS(ON)
V RUN/SS(LE)
V RUN/SS(LT)
RUN Pin Start Threshold
RUN Pin Latchoff Enable Threshold
RUN Pin Latchoff Threshold
RUN/SS Pin Rising
RUN/SS Pin Falling
●
0.8
1.4
3
2.3
2
V
V
V
I RUN/SS(C)
I RUN/SS(D)
UVLO
UVLO (HYS)
TG R UP
TG R DOWN
BG R UP
BG R DOWN
Soft-Start Charge Current
Soft-Start Discharge Current
Undervoltage Lockout
Undervoltage Lockout Hysteresis
TG Driver Pull-Up On-Resistance
TG Driver Pull-Down On-Resistance
BG Driver Pull-Up On-Resistance
BG Driver Pull-Down On-Resistance
V CC Falling
Measured at V CC Pin
TG High (Note 5)
TG Low (Note 5)
BG High (Note 5)
BG Low (Note 5)
– 0.5
0.8
– 1.2
2
3.9
0.2
2
1.5
3
1.5
–3
4
4.2
0.35
μ A
μ A
V
V
?
?
?
?
Tracking
I TRACK
TRACK Pin Input Current
I TH = 1.2V, V TRACK = 0.2V (Note 3)
–100
–150
nA
V FB(TRACK)
Feedback Voltage at Tracking
V TRACK = 0.1V, I TH = 1.2V (Note 3)
V TRACK = 0.3V, I TH = 1.2V (Note 3)
V TRACK = 0.5V, I TH = 1.2V (Note 3)
90
290
490
100
300
500
110
310
510
mV
mV
mV
PGOOD Output
? V FBH
? V FBL
PGOOD Upper Threshold
PGOOD Lower Threshold
V FB Rising
V FB Falling
8.5
– 8.5
10
– 10
12.5
– 12.5
%
%
PG Delay
? V FB(HYS)
I PGOOD
PGOOD Delay
PGOOD Hysteresis
PGOOD Leakage Current
V FB Rising
V FB Returning
V PGOOD = 7V
100
3.5
± 1
μ s
%
μ A
V PGL
PGOOD Low Voltage
I PGOOD = 5mA
0.2
0.4
V
3709fb
3
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