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参数资料
| 型号： | LT3502IDC |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 2 X 2 MM, PLASTIC, DFN-10 |
| 文件页数： | 18/20页 |
| 文件大小： | 457K |
| 代理商： | LT3502IDC |
LT3502/LT3502A
7
3502f
OPERATION
The LT3502/LT3502A are constant frequency, current
mode step-down regulators. An oscillator enables an RS
ip-op, turning on the internal 500mA power switch Q1.
An amplier and comparator monitor the current owing
between the VIN and SW pins, turning the switch off when
this current reaches a level determined by the voltage at
VC. An error amplier measures the output voltage through
an external resistor divider tied to the FB pin and servos
the VC node. If the error amplier’s output increases, more
current is delivered to the output; if it decreases, less cur-
rent 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. The
SHDN pin voltage
during soft-start also reduces the oscillator frequency to
avoid hitting current limit during start-up.
An internal regulator provides power to the control cir-
cuitry. This regulator includes an undervoltage lockout to
prevent switching when VIN is less than ~3V. The SHDN
pin is used to place the LT3502/LT3502A in shutdown,
disconnecting the output and reducing the input current
to less than 2μA.
The switch driver operates from either VIN or from the
BOOST pin. An external capacitor and the internal 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
efcient operation.
A comparator monitors the current owing through the
catch diode via the DA pin and reduces the LT3502/
LT3502A’s operating frequency when the DA pin current
exceeds the 650mA valley current limit. This frequency
foldback helps to control the output current in fault con-
ditions such as shorted output with high input voltage.
The DA comparator works in conjunction with the switch
peak current limit comparator to determine the maximum
deliverable current of the LT3502/LT3502A. The peak
current limit comparator is used in normal current mode
operations and is used to turn off the switch. The DA val-
ley current comparator monitors the catch diode current
and will delay switching until the catch diode current is
below the 650mA limit. Maximum deliverable current to
the output is therefore limited by both switch peak current
limit and DA valley current limit.
相关PDF资料 |
PDF描述 |
|---|---|
| LT3502EDC | 1.1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| LT3506IDHD#TR | 3.6 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3506IDHD | 3.6 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO16 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3502IDC#PBF | 制造商:Linear Technology 功能描述:Bulk |
| LT3502IDC#TRMPBF | 功能描述:IC REG BUCK ADJ 0.5A 8DFN 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 |
| LT3502IDC#TRPBF | 功能描述:IC REG BUCK ADJ 0.5A 8DFN 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 |
| LT3502IDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10 |
| LT3502IDCTRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3-40V DFN8EP |
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