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参数资料
| 型号： | LT1941EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG TRPL 28TSSOP |
| 标准包装： | 2,000 |
| 类型： | 降压（降压），升压（升压），反相，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 1.25 V ~ 40 V |
| 输入电压： | 3.5 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
LT1941
APPLICATIONS INFORMATION
can handle at least 1.5A of current without saturating and
ensure that the inductor has a low DCR (copper-wire resis-
tance) to minimize I 2 R power losses. If using uncoupled
inductors, each inductor need only handle one-half of the
total switch current so that 0.75A per inductor is suf?cient.
A 4.7μH to 15μH coupled inductor or two 15μH to 20μH
uncoupled inductors will usually be the best choice for
most LT1941 inverter designs. A 4.7μH to 15μH inductor
will be the best choice for most LT1941 boost designs. In
this case, the single inductor must carry the entire 1.5A
peak switch current.
exceeds 20V, use the UPS140 (a 40V diode). These diodes
are rated to handle an average forward current of 1A. For
applications where the average forward current of the
diode is less than 0.5A, use an ON Semiconductor
MBR0520L diode. The load current for boost, SEPIC and
inverting con?gurations is equal to the average diode
current.
BIAS2 Pin Considerations
The BIAS2 pin provides the drive current for the inverter/
boost switch. The voltage source on the BIAS2 line should
Table 4. Inductors
PART NUMBER
VALUE
(μH)
I SAT(DC)
(A)
DCR
(Ω)
HEIGHT
(mm)
be able to supply the rated current and be at a minimum
of 2.5V. For highest ef?ciency, use the lowest voltage
source possible (V OUT = 3.3V, for example) to minimize
Coiltronics
the V BIAS2 ? I BIAS2 power loss inside the part.
TP3-4R7
4.7
1.5
0.181
2.2
TP4-100
Sumida
CDRH6D38NP-6R2
CDRH6D38NP-7R4
CDRH6D38NP-100
10
6.2
7.4
10
1.5
2.5
2.3
2.0
0.146
20m
23m
28m
3.0
3.8
3.8
3.8
INPUT CAPACITOR SELECTION
Bypass the input of the LT1941 circuit with a 10μF or
higher ceramic capacitor of X7R or X5R type. A lower
value or a less expensive Y5V type will work if there is
additional bypassing provided by bulk electrolytic capaci-
Output Capacitor Selection
Use low ESR (equivalent series resistance) capacitors at
the output to minimize the output ripple voltage. Multilayer
ceramic capacitors are an excellent choice; they have an
extremely low ESR and are available in very small pack-
ages. X7R dielectrics are preferred, followed by X5R, as
these materials retain their capacitance over wide voltage
and temperature ranges. A 4.7μF to 20μF output capacitor
is suf?cient for most LT1941 applications. Solid tantalum
or OS-CON capacitors will work but they will occupy more
board area and will have a higher ESR than a ceramic
capacitor. Always use a capacitor with a suf?cient volt-
age rating.
Diode Selection
tors, or if the input source impedance is low. The following
paragraphs describe the input capacitor considerations
in more detail.
Step-down regulators draw current from the input sup-
ply in pulses with very fast rise and fall times. The input
capacitor is required to reduce the resulting voltage ripple
at the LT1941 input and to force this switching current
into a tight local loop, minimizing EMI. The input capaci-
tor must have low impedance at the switching frequency
to do this effectively and it must have an adequate ripple
current rating. With two switchers operating at the same
frequency but with different phases and duty cycles, cal-
culating the input capacitor RMS current is not simple;
however, a conservative value is the RMS input current
for the channel that is delivering the most power (V OUT
times I OUT ):
A Schottky diode is recommended for use with the LT1941
inverter/boost regulator. The Microsemi UPS120 is a very
good choice. Where the input to output voltage differential
C IN ( RMS ) = I OUT ?
V OUT ( V IN – V OUT )
V IN
<
I OUT
2
1941fb
15
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