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| 型号： | LT3436EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 34 V |
| 输入电压： | 3 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 800kHz |
| 电流 - 输出： | 3A |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
LT3436
APPLICATIO N S I N FOR M ATIO N
INDUCTOR CHOICE AND MAXIMUM OUTPUT
The recommended minimum inductance is:
( V IN ) ( V OUT – V IN )
0 . 4 ( V OUT ) ( I OUT )( f )
CURRENT
When choosing an inductor, there are 2 conditions that
limit the minimum inductance; required output current,
L MIN =
2
2
and avoidance of subharmonic oscillation. The maximum
output current for the LT3436 in a standard boost con-
verter configuration with an infinitely large inductor is:
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
I OUT ( MAX ) = 3 A
V IN ? η
V OUT
with DC current and manufacturing tolerance.
The inductor must have a rating greater than its peak
operating current to prevent saturation resulting in effi-
+ IN OUT IN
I LPEAK =
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:
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 ) ? 3 – 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-
Table 2
tion, must be met if the operating duty cycle is greater than
50%. The slope compensation circuit within the LT3436
PART
NUMBER
VALUE
( μ H)
I SAT(DC)
(Amps)
DCR
( ? )
HEIGHT
(mm)
prevents subharmonic oscillation for inductor ripple cur-
Coilcraft
rents of up to 1.4A P-P , defining the minimum inductor
DO1608C-222
2.2
2.4
0.07
2.9
value to be:
Sumida
CDRH3D16-1R5
1.5
1.6
0.043
1.8
L MIN =
V IN (V OUT – V IN )
1 . 4 V OUT ( f )
CDRH4D18-1R0
CDC5D23-2R2
CR43-1R4
1.0
2.2
1.4
1.7
2.2
2.5
0.035
0.03
0.056
2.0
2.5
3.5
These conditions define the absolute minimum induc-
tance. However, it is generally recommended that to
prevent excessive output noise, and difficulty in obtaining
stability, the ripple current is no more than 40% of the
average inductor current. Since inductor ripple is:
CDRH5D28-2R6
CDRH6D38-3R3
CDRH6D28-3R0
Toko
(D62F)847FY-2R4M
2.6
3.3
3.0
2.4
2.6
3.5
3.0
2.5
0.013
0.02
0.024
0.037
3.0
4.0
3.0
2.7
I P ? P RIPPLE =
V IN (V OUT – V IN )
V OUT ( L )( f )
(D73LF)817FY-2R2M
2.2
2.7
0.03
3.0
3436fa
7
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