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参数资料
| 型号： | LT3503EDCB |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 3 MM, PLASTIC, MO-229, DFN-6 |
| 文件页数： | 18/20页 |
| 文件大小： | 423K |
| 代理商： | LT3503EDCB |
7
LT3503
3503f
OPERATIO
U
The LT3503 is a constant frequency, current mode step-
down regulator. A 2.2MHz oscillator enables an RS flip-
flop, turning on the internal 1.75A power switch Q1. An
amplifier and comparator monitor the current flowing
between the VIN and SW pins, turning the switch off when
this current reaches a level determined by the voltage at
VC. An error amplifier measures the output voltage through
an external resistor divider tied to the FB pin and servos the
VC node. If the error amplifier’s output increases, more
current is delivered to the output; if it decreases, less
current is delivered. An active clamp (not shown) on the VC
node provides current limit. The VC node is also clamped
to the voltage on the SHDN pin; soft-start is implemented
by generating a voltage ramp at the SHDN pin using an
external resistor and capacitor.
An internal regulator provides power to the control cir-
cuitry. This regulator includes an undervoltage lockout to
prevent switching when VIN is less than ~3.4V. The SHDN
pin is used to place the LT3503 in shutdown, disconnect-
ing the output and reducing the input current to less than
2
A.
The switch driver operates from either the input or from
the BOOST pin. An external capacitor and diode are used
to generate a voltage at the BOOST pin that is higher than
the input supply. This allows the driver to fully saturate the
internal bipolar NPN power switch for efficient operation.
The oscillator reduces the LT3503’s operating frequency
when the voltage at the FB pin is low. This frequency
foldback helps to control the output current during start-
up and overload.
(Refer to Block Diagram)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3503EDCB#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 6-Pin DFN EP 制造商:Linear Technology 功能描述:REG SWITCHING STEP DOWN 1A 2.2MHZ 制造商:Linear Technology 功能描述:REG, SWITCHING, STEP DOWN, 1A 2.2MHZ 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Cut Tape 1A, 2.2MHz Buck Regulator ;RoHS Compliant: Yes |
| LT3503EDCB#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 6-Pin DFN EP T/R |
| LT3503EDCB#TRMPBF | 功能描述:IC REG BUCK ADJ 1A 6DFN 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 |
| LT3503EDCB#TRPBF | 功能描述:IC REG BUCK ADJ 1A 6DFN 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT3503EDCBTRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3.6-20V DFN6EP |
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