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| 型号： | LT1766EGN |
| 厂商： | Linear Technology |
| 文件页数： | 24/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 16SSOP |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 54 V |
| 输入电压： | 5.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 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-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SSOP |
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LT1766/LT1766-5
APPLICATIONS INFORMATION
When using R C , the maximum value has two limitations.
First, the combination of output capacitor ESR and R C
may stop the loop rolling off altogether. Second, if the
loop gain is not rolled off suf?ciently at the switching
frequency, output ripple will peturb the V C pin enough to
cause unstable duty cycle switching similar to subharmonic
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 LT1766 already in-
cludes a resistor, R C and ?lter 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 ≥10). 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 LT1766). 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 applica-
tions. Sudden shorts to the output can create unacceptably
large negative transients on the FB pin.
For V IN -to-V OUT ratios <10, higher loop bandwidths are
possible by readjusting the frequency compensation
components at the V C pin.
When checking loop stability, the circuit should be op-
erated over the applications’s full voltage, current and
temperature range. Proper loop compensation may be
obtained by emperical methods as described in detail in
Application Notes 19 and 76.
CONVERTER WITH BACKUP OUTPUT REGULATOR
In systems with a primary and backup supply, for example,
a battery-powered device with a wall adapter input, the
output of the LT1766 can be held up by the backup supply
with the LT1766 input disconnected. In this condition, 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 25μA will
be pulled via the SW pin from the second supply. With the
SHDN pin ?oating, the LT1766 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
con?guration with the addition of R3, R4, C SS and Q1.
As the output starts to rise, Q1 turns on, regulating switch
current via the V C pin to maintain a constant dv/dt at the
output. Output rise time is controlled by the current through
C SS de?ned by R4 and Q1’s V BE . Once the output is in
regulation, Q1 turns off and the circuit operates normally.
R3 is transient protection for the base of Q1.
D2
1N4148W
REMOVABLE
INPUT
D3
10MQ060N
R3
54k
V IN
SHDN
BOOST
LT1766
SW
BIAS
C2
0.33μF
L1
47μH
R1
15.4k
5V, 1A
ALTERNATE
SUPPLY
R4
25k
C3
2.2μF
SYNC
GND
R C
2.2k
FB
V C
C F
220pF
D1
10MQ060N
R2
4.99k
+
C1
100μF
10V
C C
0.022μF
1766 F12
Figure 12. Dual Source Supply with 25μA Reverse Leakage
1766fc
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1766EGN#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 |
| LT1766EGN#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:- 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 |
| LT1766EGN#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:- 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 |
| LT1766EGN-5 | 功能描述:IC REG BUCK 5V 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:- 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 |
| LT1766EGN-5#PBF | 功能描述:IC REG BUCK 5V 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 |
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