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| 型号： | LTC3554EPD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A BATTERY CHARGE CONTROLLER, 2590 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, UTQFN-20 |
| 文件页数： | 13/36页 |
| 文件大小： | 418K |
| 代理商： | LTC3554EPD#TRPBF |
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LTC3554/LTC3554-2
20
35542fb
STEP-DOWN SWITCHING REGULATOR
Introduction
The LTC3554 includes two constant-frequency cur-
rent-mode 200mA step-down switching regulators, also
known as buck regulators. At light loads, each regulator
automatically enters Burst Mode operation to maintain
high efciency.
Applications with a near-zero-current sleep or memory
keep-alive mode can command the LTC3554 switching
regulators into a standby mode that maintains output
regulation while drawing only 1.5μA quiescent current
per active regulator. Load capability drops to 5mA per
regulator in this mode.
Switching frequency and switch slew rate are pin-select-
able, allowing the application circuit to dynamically trade
off efciency and EMI performance.
The regulators are enabled, disabled and sequenced
through the pushbutton interface (see the Pushbutton
Interface section for more information). It is recommended
that the step-down switching regulator input supply
(BVIN) be connected to the system supply pin (VOUT).
This is recommended because the undervoltage lockout
circuit on the VOUT pin (VOUT UVLO) disables the step-
down switching regulators when the VOUT voltage drops
below the VOUT UVLO threshold. If driving the step-down
switching regulator input supplies from a voltage other
than VOUT, the regulators should not be operated outside
their specied operating voltage range as operation is not
guaranteed beyond this range.
Output Voltage Programming
Figure 3 shows the step-down switching regulator
application circuit. The output voltage for each step-down
switching regulator is programmed using a resistor divider
from the step-down switching regulator output connected
to the feedback pins (FB1 and FB2) such that:
VOUTx = 0.8V
R1
R2
+1
Typical values for R1 can be as high as 2.2MΩ.
(R1 + R2) can be as high as 3MΩ. The capacitor CFB
cancels the pole created by feedback resistors and
the input capacitance of the FB pin and also helps to
improve transient response for output voltages much
greater than 0.8V. A variety of capacitor sizes can be used
for CFB but a value of 10pF is recommended for most
applications. Experimentation with capacitor sizes between
2pF and 22pF may yield improved transient response.
OPERATION
Figure 3. Step-down Switching Regulator
Application Circuit
3554 F03
0.8V
VIN
CFB
COUT
VOUTx
MP
MN
GND
FBx
R1
SWx
L
PWM
CONTROL
EN
FSEL
R2
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相关代理商/技术参数 |
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| LTC3554EUD#PBF | 功能描述:IC USB POWER MANAGER 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:热电冷却器 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商设备封装:28-TSSOP 裸露焊盘 包装:管件 产品目录页面:1410 (CN2011-ZH PDF) |
| LTC3554EUD#TRPBF | 功能描述:IC USB POWER MANAGER 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3554EUD-1#PBF | 功能描述:IC USB POWER MANAGER 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3554EUD-1#TRPBF | 功能描述:IC USB POWER MANAGER 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3554EUD-2#PBF | 功能描述:IC USB POWER MANAGER 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:热电冷却器 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商设备封装:28-TSSOP 裸露焊盘 包装:管件 产品目录页面:1410 (CN2011-ZH PDF) |
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