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參數(shù)資料
| 型號： | LT3437IFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | MOSFET N-CHANNEL 100V SOT323 |
| 中文描述： | 0.9 A SWITCHING REGULATOR, 240 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大小： | 523K |
| 代理商： | LT3437IFE |
LT3437
17
3437f
APPLICATIU
below 2.4V, switching will be disabled. The undervoltage
lockout threshold doesn’t have any hysteresis and is
mainly used to insure that all internal voltages are at the
correct level before switching is enabled. If an undervolt-
age lockout function with hysteresis is needed to limit
input current at low V
IN
to V
OUT
ratios, refer to Figure 7 and
the following:
W
U
U
V
R
V
R
R
( )
3
V
R
I
V
V
V
R
UVLO
SHDN
3
1
SHDN
2
SHDN
SHDN
HYST
OUT
=
+
+
+
=
1
See the Typical Performance Characteristics section for
graphs of SHDN and V
IN
currents verses input voltage.
SYNCHRONIZING
Oscillator synchronization to an external input is achieved
by connecting a TTL logic-compatible square wave with a
duty cycle between
25%
and
75%
to the LT3437 SYNC
pin. The synchronizing range is equal to initial operating
frequency up to
700kHz
. This means that minimum
practical sync frequency is equal to the worst-case high
self-oscillating frequency (
240kHz
), not the typical oper-
ating frequency of
200kHz
. Caution should be used when
synchronizing above
300kHz,
because at higher sync
frequencies the amplitude of the internal slope compen-
sation used to prevent subharmonic switching is re-
duced. This type of subharmonic switching only occurs at
input voltages less than twice output voltage. Higher
inductor values will tend to eliminate this problem. See
Frequency Compensation section for a discussion of an
entirely different cause of subharmonic switching before
assuming that the cause is insufficient slope compensa-
tion. Application Note 19 has more details on the theory
of slope compensation.
If the FB pin voltage is below 0.9V (power-up or output
short-circuit conditions), the sync function is disabled.
This allows the frequency foldback to operate to avoid
hazardous conditions for the SW pin.
If a synchronization signal or logic-level above 2V is
present at the SYNC pin, Burst Mode operation is disabled.
Burst Mode operation can be enabled or disabled on the
fly. If no synchronization or Burst Mode defeat is required,
this pin should be connected to ground.
LAYOUT CONSIDERATIONS
As with all high frequency switchers, when considering
layout, care must be taken in order to achieve optimal
electrical, thermal and noise performance. For maximum
efficiency, switch rise and fall times are typically in the
nanosecond range. To prevent noise both radiated and
conducted, the high speed switching current path,
shown in Figure 8, must be kept as short as possible. This
is implemented in the suggested layouts of Figure 9.
Shortening this path will also reduce the parasitic trace
R1 should be chosen to minimize quiescent current during
normal operation by the following equation:
R
V
V
I
IN
SHDN TYP
1
2
1 5
.
=
( )
(
)
–
(
)
Example:
R
A
M
R
M
M
A
M
k
1
12–
1.
(
(
1 3
.
3
5 1 3
1
6 5
.
1
1 3
.
6 49
.
408
=
μ
)
=
=
)
=
(Nearest 1% 412k)
μ
=
.
–
–
(Nearest 1% 6.49M )
R2=
1.3
7–1.3
1.3M
ENABLE
1.3V
3437 F07
5
μ
A
SHDN
R2
2.4V
–
+
SHDN
COMP
–
+
V
COMP
10
V
IN
V
OUT
LT3437
2
R1
R3
Figure 7. Undervoltage Lockout
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| LT3437IFE#PBF | 功能描述:IC REG BUCK ADJ 0.5A 16TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3437IFE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 200KHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 200KHZ, TSSOP-16 |
| LT3437IFE#TRPBF | 功能描述:IC REG BUCK ADJ 0.5A 16TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3439 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Slew Rate Controlled Ultralow Noise1A Isolated DC/DC Transformer Driver |
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