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| 型号： | LTC3606BIDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.8A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 800mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3606B
APPLICATIONS INFORMATION
Design Example
As a design example, consider using the LTC3606B in a
USB-GSM application, with V IN = 5V, I INMAX = 500mA,
with the output charging a SuperCap of 4.4mF. The load
requires 800mA in active mode and 1mA in standby mode.
The output voltage V OUT = 3.4V.
First, calculate the inductor value for about 40% ripple
of C IN = 10μF should suf?ce, if the source impedance is
very low.
The feedback resistors program the output voltage. To
maintain high ef?ciency at light loads, the current in these
resistors should be kept small. Choosing 10μA with the
0.6V feedback voltage makes R1~60k. A close standard
1% resistor is 59k. Using Equation (2).
current (320mA in this example) at maximum V IN . Using
a derivation of Equation (1):
R2 =
V OUT
0.6
1 ? R1 = 276k, 280k for 1%
L1 =
3.4V
2.25MHz ? (320mA)
? 1
3.4V
5V
= 1.51μH
A feedforward capacitor is not used since the 4.4mF
SuperCap will inhibit any fast output voltage transients.
For the inductor, use the closest standard value of 1.5μH.
The 4.4mF supercaps are used to deliver the required
2A pulses to power the RF power ampli?ers, while the
LTC3606B recharges the supercap after the pulse ends,
see Figure 4c. As for the input capacitor, a typical value
Figure 4 shows the complete schematic for this example,
along with the ef?ciency curve and transient response.
Input current limit is set at 475mA average current, R LIM
= 116k, C LIM = 2200pF. See Programming Input Current
Limit section for selecting R LIM and Selection of C LIM
Capacitance section for C LIM .
L1
V IN
USB INPUT 5V
V IN
SW
1.5μH
V OUT
3.4V AT
PGOOD
C IN
10μF
R PGD
499k
LTC3606B
RUN
PGOOD
RLIM
GND
V FB
R2
280k
R1
+
800mA
C OUT
2.2mF
2
SuperCap
C LIM
2200pF
R LIM
116k
I LIM = 475mA
59k
C IN : AVX 08056D106KAT2A
C OUT : VISHAY 592D228X96R3X2T20H
L1: COILCRAFT LPS4012-152ML
3606B F04
Figure 4a. Design Example Circuit
3606bfb
16
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相关代理商/技术参数 |
参数描述 |
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| LTC3607EUD#PBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 0.6A 16QFN 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, QFN-16, Primary Input Voltage:15V, No. of Outputs:2, Output Current:600mA, No. of Pins:16, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:-, Package / Case:16-QFN , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, 15V Dual 600mA Monolithic Synchronous Step-Down DC/DC Regul |
| LTC3607EUD#TRPBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 0.6A 16QFN 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, 15V Dual 600mA Monolithic Synchronous Step-Down DC/DC Regul |
| LTC3608EWKG#PBF | 功能描述:IC REG BUCK SYNC ADJ 8A 52QFN 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 |
| LTC3608EWKG#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 8A 52QFN 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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