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参数资料
| 型号： | LTC3778EF#TR |
| 厂商： | Linear Technology |
| 文件页数： | 2/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 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： | -40°C ~ 85°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC3778EFTR |
LTC3778
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
Input Supply Voltage (V IN , I ON )..................36V to – 0.3V
Boosted Topside Driver Supply Voltage
(BOOST) ................................................... 42V to – 0.3V
SENSE + , SW Voltage.................................... 36V to – 5V
DRV CC , EXTV CC , (BOOST – SW), FCB,
RUN/SS, PGOOD Voltages .................... 7V to – 0.3V
RUN/SS 1
V ON 2
PGOOD 3
V RNG 4
I TH 5
TOP VIEW
20 BOOST
19 TG
18 SW
17 SENSE +
16 SENSE –
ORDER PART
NUMBER
LTC3778EF
V ON, V RNG Voltages ................... INTV CC + 0.3V to – 0.3V
I TH , V FB Voltages...................................... 2.7V to – 0.3V
TG, BG, INTV CC Peak Currents .................................. 2A
TG, BG, INTV CC RMS Currents ............................ 50mA
Operating Ambient Temperature
Range (Note 4) ................................... – 40 ° C to 85 ° C
Junction Temperature (Note 2) ............................ 125 ° C
Storage Temperature Range ................. – 65 ° C to 150 ° C
Lead Temperature (Soldering, 10 sec).................. 300 ° C
FCB 6 15 PGND
SGND 7 14 BG
I ON 8 13 DRV CC
VFB 9 12 INTV CC
EXTV CC 10 11 V IN
F PACKAGE
20-LEAD PLASTIC TSSOP
T JMAX = 125 ° C, θ JA = 110 ° C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are T A = 25 ° C. V IN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loop
I Q
Input DC Supply Current
Normal
Shutdown Supply Current
900
15
2000
30
μ A
μ A
V FB
Feedback Reference Voltage
I TH = 1.2V (Note 3)
q
0.594
0.600
0.606
V
? V FB(LINEREG)
Feedback Voltage Line Regulation
V IN = 4V to 30V, I TH = 1.2V (Note 3)
0.002
%/V
? V FB(LOADREG)
I FB
Feedback Voltage Load Regulation
Feedback Pin Input Current
I TH = 0.5V to 1.9V (Note 3)
– 0.05
–5
– 0.3
± 100
%
nA
g m(EA)
V FCB
I FCB
t ON
t ON(MIN)
t OFF(MIN)
V SENSE(MAX)
Error Amplifier Transconductance
Forced Continuous Threshold
Forced Continuous Pin Current
On-Time
Minimum On-Time
Minimum Off-Time
Maximum Current Sense Threshold
V SENSE– – V SENSE+
I TH = 1.2V (Note 3)
V FCB = 0.6V
I ON = 60 μ A, V ON = 1.5V
I ON = 60 μ A, V ON = 0V
I ON = 180 μ A, V ON = 0V
I ON = 60 μ A, V ON = 1.5V
V RNG = 1V, V FB = 0.56V
V RNG = 0V, V FB = 0.56V
V RNG = INTV CC , V FB = 0.56V
q
q
q
q
q
1.4
0.57
200
113
79
158
1.7
0.6
–1
250
110
50
250
133
93
186
2
0.63
–2
300
100
400
153
107
214
mS
V
μ A
ns
ns
ns
ns
mV
mV
mV
V SENSE(MIN)
Minimum Current Sense Threshold
V SENSE+ – V SENSE–
V RNG = 1V, V FB = 0.64V
V RNG = 0V, V FB = 0.64V
V RNG = INTV CC , V FB = 0.64V
67
47
93
mV
mV
mV
? V FB(OV)
? V FB(UV)
Output Overvoltage Fault Threshold
Output Undervoltage Fault Threshold
7.5
340
10
400
12.5
460
%
mV
3778f
2
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