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| 型号： | LT1956IFE-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1.5A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 5.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
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LT1956/LT1956-5
APPLICATIO S I FOR ATIO
LT1956
80
180
CURRENT MODE
POWER STAGE
SW
OUTPUT
60
GAIN
150
g m = 2mho
ERROR
AMPLIFIER
C FB
R1
40
120
R O
200k
g m =
2000 μ mho
FB
1.22V
R LOAD
+
TANTALUM
ESR
CERAMIC
ESL
20
0
PHASE
90
60
C1
C1
GND
V C
–20
30
R2
R C
C C
C F
–40
10 100
V IN = 12V
1k 10k 100k
FREQUENCY (Hz)
R C = 2.2k
0
1M
1956 F11
1956 F10
V OUT = 5V
I LOAD = 500mA
C OUT = 100 μ F, 10V, 0.1 ?
C C = 22nF
C F = 220pF
Figure 10. Model for Loop Response
oscillations. If needed, an additional capacitor (C F ) can be
added across the R C /C C network from the V C pin to ground
to further suppress V C ripple voltage.
With a tantalum output capacitor, the LT1956 already
includes a resistor (R C ) and filter capacitor (C F ) at the V C
pin (see Figures 10 and 11) to compensate the loop over
the entire V IN range (to allow for stable pulse skipping for
high V IN -to-V OUT ratios ≥ 4). A ceramic output capacitor
can still be used with a simple adjustment to the resistor
R C for stable operation (see Ceramic Capacitors section
for stabilizing LT1956). If additional phase margin is
required, a capacitor (C FB ) can be inserted between the
output and FB pin but care must be taken for high output
voltage applications. Sudden shorts to the output can
create unacceptably large negative transients on the FB
pin.
For V IN -to-V OUT ratios < 4, higher loop bandwidths are
possible by readjusting the frequency compensation com-
ponents at the V C pin.
When checking loop stability, the circuit should be oper-
ated over the application’s full voltage, current and tem-
perature range. Proper loop compensation may be obtained
by empirical methods as described in Application Notes 19
and 76.
Figure 11. Overall Loop Response
CONVERTER WITH BACKUP OUTPUT REGULATOR
In systems with a primary and backup supply, for ex-
ample, a battery powered device with a wall adapter input,
the output of the LT1956 can be held up by the backup
supply with the LT1956 input disconnected. In this condi-
tion, the SW pin will source current into the V IN pin. If the
SHDN pin is held at ground, only the shut down current of
25 μ A will be pulled via the SW pin from the second supply.
With the SHDN pin floating, the LT1956 will consume its
quiescent operating current of 1.5mA. The V IN pin will also
source current to any other components connected to the
input line. If this load is greater than 10mA or the input
could be shorted to ground, a series Schottky diode must
be added, as shown in Figure 12. With these safeguards,
the output can be held at voltages up to the V IN absolute
maximum rating.
BUCK CONVERTER WITH ADJUSTABLE SOFT-START
Large capacitive loads or high input voltages can cause
high input currents at start-up. Figure 13 shows a circuit
that limits the dv/dt of the output at start-up, controlling
the capacitor charge rate. The buck converter is a typical
configuration with the addition of R3, R4, C SS and Q1.
As the output starts to rise, Q1 turns on, regulating switch
1956f
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1956IGN | 功能描述:IC REG BUCK ADJ 1.5A 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1956IGN#PBF | 功能描述:IC REG BUCK ADJ 1.5A 16SSOP 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 |
| LT1956IGN#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR SSOP-16 |
| LT1956IGN#TR | 功能描述:IC REG BUCK ADJ 1.5A 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1956IGN#TRPBF | 功能描述:IC REG BUCK ADJ 1.5A 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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