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参数资料
| 型号： | LTC1702IGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 30/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-SSOP |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 750kHz |
| 占空比： | 93% |
| 电源电压： | 3 V ~ 7 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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LTC1702
APPLICATIO N S I N FOR M ATIO N
Making L smaller than this optimum value yields little or no
improvement in transient response. As the output voltage
recovers, the inductor current will briefly rise above the
level of the output current to replenish the charge lost from
the output capacitor. With a properly compensated loop,
the entire recovery time will be inside of 10 μ s.
Most loads care only about the maximum deviation from
ideal, which occurs somewhere in the first two cycles after
the load step hits. During this time, the output capacitor
does all the work until the inductor and control loop regain
control. The initial drop (or rise if the load steps down) is
entirely controlled by the ESR of the capacitor and amounts
to most of the total voltage drop. To minimize this drop,
reduce the ESR as much as possible by choosing low ESR
capacitors and/or paralleling multiple capacitors at the
output. The capacitance value accounts for the rest of the
voltage drop until the inductor current rises. With most
output capacitors, several devices paralleled to get the
ESR down will have so much capacitance that this drop
term is negligible. Ceramic capacitors are an exception; a
small ceramic capacitor can have suitably low ESR with
relatively small values of capacitance, making this second
drop term significant.
Optimizing Loop Compensation
Loop compensation has a fundamental impact on tran-
sient recovery time, the time it takes the LTC1702 to
recover after the output voltage has dropped due to output
capacitor ESR. Optimizing loop compensation entails
maintaining the highest possible loop bandwidth while
ensuring loop stability. The Feedback Component Selec-
tion section describes in detail how to design an optimized
feedback loop, appropriate for most LTC1702 systems.
Voltage Positioning
If the load transients consist primarily of load steps from
near zero load to full load and back, the transient response
can be traded off against DC regulation performance by
using a technique known as “voltage positioning.” The
goal is to intentionally compromise the DC regulation loop
such that the output rides near the maximum allowable
value (often +5%) with no load and near the minimum
allowable value at maximum load. With the load at zero,
any transient that comes along will be a current increase
which will cause the output voltage to fall. Since the output
voltage is initially at a high value, it can fall further before
LTC1702
V IN
V OUT
+5%
V OUT NOM
–5%
MAXIMUM
ALLOWABLE
TRANSIENT
FB
LOAD
CURRENT
MAX
0
1702 F17a
1702 F17b
Figure 17a. Standard Regulator
Figure 17b. Standard Regulator—Transient Response
V IN
+5%
MAXIMUM
LTC1702
FB
V OUT
V OUT NOM
–5%
MAX
LOAD
CURRENT
0
ALLOWABLE
TRANSIENT
≈ 2 × FIGURE 17b
1702 F17c
1702 F17d
Figure 17c. Voltage Positioning Regulator
Figure 17d. Positioning Regulator—Transient Response
1702fa
30
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相关代理商/技术参数 |
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| LTC1703CG | 功能描述:IC REG SW DUAL SYNC VID 28SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1703CG#PBF | 功能描述:IC REG SW DUAL SYNC VID 28SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LTC1703CG#TR | 制造商:Linear Technology 功能描述:LDO Cntrlr REG CTRLR 0.9V to 2V 28-Pin SSOP T/R |
| LTC1703CG#TRPBF | 功能描述:IC REG SW DUAL SYNC VID 28SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1703IG | 功能描述:IC REG SW DL SYNC W/VID 28-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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