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参数资料
| 型号： | LT3781IG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM 20-SSOP |
| 标准包装： | 66 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 700kHz |
| 占空比： | 100% |
| 电源电压： | 8 V ~ 72 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
LT3781
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
Power Supply (V CC )
Low Impedance Source Voltage ............. –0.3V to 20V
Shutdown Mode:
(Supply Self-Regulates to 18V)
Maximum Input Current ............................... 20mA
Topside Supply (V BST ) ....................................................
V BSTREF – 0.3V to V BSTREF +20V (V BST(MAX) = 90V)
Topside Reference Pin (V BSTREF ) ............... –0.6V to 75V
SHDN Pin Voltage ........................... –0.3V to V CC + 0.3V
All Other Input Voltages .............. –0.3V to 5V REF + 0.3V
SHDN
OVLO
THERM
SGND
5V REF
FSET
SYNC
SS
V FB
1
2
3
4
5
6
7
8
9
TOP VIEW
20 V BST
19 TG
18 BSTREF
17 NC
16 NC
15 BG
14 PWRGND
13 V CC
12 SG
ORDER PART
NUMBER
LT3781EG
LT3781IG
5V REF Pin Sink Current ......................................... 10mA
V C 10
11 SENSE
FSET Pin Current ...................................... –2mA to 5mA
All Other Input Pin Currents ...................... –2mA to 2mA
Operating Ambient
Temperature Range (Note 4) ............... –40 ° C to 85 ° C
Operating Junction
Temperature Range ............................... –40 ° C to 125 ° C
Storage Temperature Range .................. –65 ° C to 150 ° C
Lead Temperature (Soldering, 10 sec).................. 300 ° C
G PACKAGE
20-LEAD PLASTIC SSOP
T JMAX = 125 ° C, θ JA = 90 ° 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 CC = V BST = 12V, V BSTREF = 0V, V VC = 2V, V FB = V REF = 1.25V, C TG = C BG = C SG = 1000pF.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supply and Protection
V CCUVLO
V CCSHDN
I CC
Undervoltage Lockout Threshold
Shutdown Mode Shunt Regulator
DC Active Supply Current
Falling Edge
Rising Edge
100 μ A < I VCC ≤ 10mA
(Note 2)
q
q
q
8.0
13
16.5
8.4
14.5
18
17
8.6
16
19.9
22
V
V
V
mA
q
25
mA
DC Active UVLO Supply Current
DC Standby Supply Current
V SHDN = 1.35V, V CC = 8V
V SHDN < 0.3V
q
q
800
16
1200
30
μ A
μ A
V BST
DC Active Supply Current
TG Logic High (Note 2)
q
5.0
8.5
mA
DC Standby Supply Current
V SHDN < 0.3V
0.1
μ A
V SHDN
Shutdown Rising Threshold
Shutdown Threshold Hysteresis
q
1.15
100
1.25
150
1.35
200
V
mV
I SS
Soft-Start Charge Current
V SS = 2V
q
–14
– 10
–6
μ A
V SS
Soft-Start Reset Threshold
225
mV
V BSTUVLO Boost Undervoltage Lockout
(V BST -BSTREF)
Boost UVLO Hysteresis
Falling Edge
Rising Edge
q
q
q
5.7
6.5
0.3
6.4
7.0
0.6
7.1
7.5
V
V
V
5V External Reference
V 5VREF
5V Reference Voltage
0 ≤ (I 5VREF – I VC ) < 20mA
4.85
5.0
5.10
V
q
4.80
5.15
V
I 5VREFSC
R 5VREF
Short-Circuit Current
Output Impedance
Source, I VC = 0
0 ≤ (I 5VREF – I VC ) < 20mA
q
20
45
1
mA
?
3781f
2
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