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参数资料
| 型号： | LT3435IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 54 V |
| 输入电压： | 3.3 V ~ 60 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 500kHz |
| 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 |
LT3435
APPLICATIO S I FOR ATIO
ramp rate. When the current through the C SS capacitor
exceeds the C SS threshold (I CSS ), the voltage ramp of the
output capacitor is limited by reducing the V C pin voltage.
The minimum average input current depends on the V IN to
V OUT ratio, V C frequency compensation, feedback divider
network and Schottky diode leakage. It can be approxi-
? V ? ( I BIASS + I FB + I S
()
I IN ( AVG ) ? I VINS + I SHDN + ? OUT ?
The C SS threshold is proportional to the FB voltage (see
Typical Performance Characteristics) and is defeated for
FB voltages greater than 0.9V (typical). The output dV/dt
can be approximated by:
mated by the following equation:
? V IN ? η
)
= CSS
dV
dt
I
C SS
where
I VINS = input pin current in sleep mode
but actual values will vary due to start-up load conditions,
compensation values and output capacitor selection.
C CSS = 1000pF
V OUT = output voltage
V IN = input voltage
I BIASS = BIAS pin current in sleep mode
I FB = feedback network current
I IN ( AVG ) = 45 μ A + 5 μ A + ?
? 12 ?
?
V OUT
1V/DIV
C CSS = 0.01μF
C CSS = 0.1μF
I S = catch diode reverse leakage at V OUT
η = low current efficiency (non Burst Mode operation)
Example: For V OUT = 3.3V, V IN = 12V
? 3 . 3 ? ( 125 μ A + 12 . 5 μ A + 0 . 5 μ A )
( 0 . 8 )
V IN = 12V
V OUT = 3.3V
1ms/DIV
3435 F04
= 45 μ A + 5 μ A + 44 μ A = 99 μ A
I L = 500mA
Figure 4. V OUT dV/dt
Burst Mode OPERATION
To enhance efficiency at light loads, the LT3435 automati-
cally switches to Burst Mode operation which keeps the
output capacitor charged to the proper voltage while
minimizing the input quiescent current. During Burst
Mode operation, the LT3435 delivers short bursts of
current to the output capacitor followed by sleep periods
150
125
100
75
50
25
0
V OUT = 3.3V
T A = 25 ° C
where the output power is delivered to the load by the
output capacitor. In addition, V IN and BIAS quiescent
currents are reduced to typically 45 μ A and 125 μ A respec-
tively during the sleep time. As the load current decreases
0
10
20 30 40
INPUT VOLTAGE (V)
Figure 5. I Q vs V IN
50
60
3435 F05
towards a no load condition, the percentage of time that
the LT3435 operates in sleep mode increases and the
average input current is greatly reduced resulting in higher
efficiency.
During the sleep portion of the Burst Mode Cycle, the V C
pin voltage is held just below the level need for normal
operation to improve transient response. See the Typical
Performance Characteristics section for burst and tran-
sient response waveforms.
3435fa
15
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| LT3436EFE#PBF | 功能描述:IC REG BOOST ADJ 3A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3436EFE#TR | 功能描述:IC REG BOOST ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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