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| 型号： | LT3462ES6#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/8页 |
| 文件大小： | 0K |
| 描述： | IC REG INV ADJ 0.25A TSOT23-6 |
| 标准包装： | 500 |
| 类型： | 反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 -38V |
| 输入电压： | 2.5 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 250mA |
| 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： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
| 其它名称： | LT3462ES6#PBF LT3462ES6#PBF-ND |
LT3462/LT3462A
BLOCK DIAGRA
1
SW
5 D
FB 3
–
+
A1
E AMP
R C
–
+
A2
COMP
R
S
Q
DRIVER
Q1
DO
C C
LG
SDREF 4
SHUTDOWN
BIAS CURRENT
CANCELLATION
OFF → 3 μ A
ON → 180 μ A
∑
ISRC
RAMP
GENERATOR
+
–
0.1 ?
2 GND
SHUTDOWN
1.2MHz*
V OUT
V OUT
–
OSCILLATOR
*LT3462A IS 2.7MHz
Q2
R1 (EXTERNAL)
FB
R2 (EXTERNAL)
SDREF
C S1 (EXTERNAL)
SDREF
C S2 (EXTERNAL)
V IN 6
1.265V
REFERENCE
+
C S1 , C S2 OPTIONAL SOFT-START COMPONENTS
3462 F02
Figure 1. Block Diagram
OPERATIO
The LT3462 uses a constant frequency, current mode
control scheme to provide excellent line and load regula-
tion. Operation can be best understood by referring to the
Block Diagram in Figure 1. At the start of each oscillator
cycle, the SR latch is set, turning on the power switch Q1.
A voltage proportional to the switch current is added to a
stabilizing ramp and the resulting sum is fed into the
positive terminal of the PWM comparator. When this
voltage exceeds the voltage at the output of the EAMP, the
SR latch is reset, turning off the power switch. The level
at the output of the EAMP is simply an amplified version
of the difference between the feedback voltage and GND.
In this manner, the error amplifier sets the correct peak
current level to keep the output in regulation. If the error
amplifier’s output increases, more current is taken from
the output; if it decreases, less current is taken. One
function not shown in Figure 1 is the current limit. The
switch current is constantly monitored and not allowed to
exceed the nominal value of 400mA. If the switch current
reaches 400mA, the SR latch is reset regardless of the
output state of the PWM comparator. This current limit cell
protects the power switch as well as various external
components connected to the LT3462.
SDREF is a dual function input pin. When driven low it
shuts the part down, reducing quiescent supply current to
less than 10 μ A. When not driven low, the SDREF pin has an
internal pull-up current that turns the regulator on. Once
the part is enabled, the SDREF pin sources up to
180 μ A nominally at a fixed voltage of 1.265V through
external resistor R2 to FB. If there is no fault condition
present, FB will regulate to 0V, and V OUT will regulate to
1.265V ? (–R1/R2). An optional soft-start circuit uses the
fixed SDREF pull-up current and a capacitor from SDREF
to V OUT to set the dV/dt on V OUT . In shutdown, an FB bias
current cancellation circuit supplies up to 150 μ A biasing
current to external resistor R1 while V OUT is lower than FB.
This function eliminates R2 loading of SDREF during
shutdown. As a result, supply current in shutdown may
exceed 10 μ A by the amount of current flowing in R1.
3462af
4
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| LT3463AEDD | 功能描述:IC REG INV ADJ 0.25A DL 10DFN RoHS:否 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 |
| LT3463AEDD#PBF | 功能描述:IC REG INV ADJ 0.25A DL 10DFN 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 |
| LT3463AEDD#TR | 功能描述:IC REG INV ADJ 0.25A DL 10DFN RoHS:否 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 |
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