参数资料
| 型号： | LT1961IMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.5A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 35 V |
| 输入电压： | 3 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.25MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
LT1961
APPLICATIO N S I N FOR M ATIO N
( V IN ) ( V OUT – V IN )
0 . 4 ( V OUT OUT )( f )
) ( I
INDUCTOR CHOICE AND MAXIMUM OUTPUT
CURRENT
When choosing an inductor, there are 2 conditions that
L MIN =
2
2
I OUT ( MAX ) = 1 . 5 A
+ IN OUT IN
I LPEAK =
limit the minimum inductance; required output current,
and avoidance of subharmonic oscillation. The maximum
output current for the LT1961 in a standard boost con-
verter configuration with an infinitely large inductor is:
V IN ? η
V OUT
Where η = converter efficiency (typically 0.87 at high
current).
As the value of inductance is reduced, ripple current
increases and I OUT(MAX) is reduced. The minimum induc-
tance for a required output current is given by:
The inductor value may need further adjustment for other
factors such as output voltage ripple and filtering require-
ments. Remember also, inductance can drop significantly
with DC current and manufacturing tolerance.
The inductor must have a rating greater than its peak
operating current to prevent saturation resulting in effi-
ciency loss. Peak inductor current is given by:
(V OUT )(I OUT ) V (V ? V )
V IN ? η 2 V OUT ( L )( f )
Also, consideration should be given to the DC resistance
of the inductor. Inductor resistance contributes directly to
2 V OUT ( f ) ? 1 . 5 – OUT OUT ?
L MIN =
V IN ( V OUT – V IN )
? ( V )( I ) ?
? V IN ? η ?
the efficiency losses in the overall converter.
Suitable inductors are available from Coilcraft, Coiltronics,
Dale, Sumida, Toko, Murata, Panasonic and other manu-
factures.
The second condition, avoidance of subharmonic oscilla-
tion, must be met if the operating duty cycle is greater than
50%. The slope compensation circuit within the LT1961
Table 2
PART NUMBER
Coiltronics
VALUE (uH) I SAT(DC) (Amps) DCR ( Ω ) HEIGHT (mm)
prevents subharmonic oscillation for inductor ripple cur-
rents of up to 0.7A P-P , defining the minimum inductor
value to be:
TP1-2R2
TP2-2R2
TP3-4R7
TP4- 100
2.2
2.2
4.7
10
1.3
1.5
1.5
1.5
0.188
0.111
0.181
0.146
1.8
2.2
2.2
3.0
L MIN =
V IN (V OUT – V IN )
0 . 7 V OUT ( f )
Murata
LQH1C1R0M04
LQH3C1R0M24
1.0
1.0
0.51
1.0
0.28
0.06
1.8
2.0
These conditions define the absolute minimum induc-
tance. However, it is generally recommended that to
LQH3C2R2M24
LQH4C1R5M04
2.2
1.5
0.79
1
0.1
0.09
2.0
2.6
prevent excessive output noise, and difficulty in obtaining
Sumida
I P ? P RIPPLE = IN OUT IN
stability, the ripple current is no more than 40% of the
average inductor current. Since inductor ripple is:
V (V – V )
V OUT ( L )( f )
The recommended minimum inductance is:
CD73- 100
CDRH4D18-2R2
CDRH5D18-6R2
CDRH5D28-100
Coilcraft
1008PS-272M
LPO1704-222M
LPO1704-332M
10
2.2
6.2
10
2.7
2.2
3.3
1.44
1.32
1.4
1.3
1.3
1.6
1.3
0.080
0.058
0.071
0.048
0.14
0.12
0.16
3.5
1.8
1.8
2.8
2.7
1.0
1.0
1961fa
8
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