参数资料
型号: LTC1433CGN#PBF
厂商: Linear Technology
文件页数: 6/20页
文件大小: 0K
描述: IC REG BUCK 3.3V/5V/ADJ 16SSOP
标准包装: 100
类型: 降压(降压)
输出类型: 两者兼有
输出数: 1
输出电压: 3.3V,5V,可调
输入电压: 3 V ~ 13.5 V
PWM 型: 电流模式
频率 - 开关: 最高 700kHz
电流 - 输出: 450mA
同步整流器:
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
包装: 管件
供应商设备封装: 16-SSOP
LTC1433/LTC1434
FU N CTIO N AL DIAGRA
POR
PLL
PLLIN
PWRV IN
50k
SLOPE
PLL LPF
C OSC
V CO
OSC
CK
FF1
Q
COMP
R SENSE
0.143 ?
LBO
D
Q
LOBAT
+
LBI
V REF
FREQ
SHIFT
BSW
SSW
+
LIDET
SV IN
0.6V
SB
FF2
Q
I TH
+
V REF
RB
Q
I PEAK
GM
DET
180k
POR
SHDN
+
6V
RUN/SS
30k
+
OVDET
SB
FF3
RB
Q
Q
I COMP
12mV
VOLTAGE
SELECT
V REF + 89mV
SHDN
V SET
V PROG
PGND
120k
60k
240k
60k
V OSENSE
SHDN
REF
V REF (1.19V)
SGND
1433/34 FD
AND
SV IN
V CC
V CC
OPERATIO N
(Refer to Functional Diagram)
Main Control Loop
The LTC1433/LTC1434 is a constant frequency, pulse-
width modulated current mode switching regulator. Dur-
ing normal operation, the internal P-channel power MOSFET
is turned on each cycle when the oscillator sets the RS
latch FF3, and turned off when the main current compara-
tor I COMP resets the latch. The peak inductor current at
which the I COMP resets the RS latch is controlled by the
voltage on the I TH pin , which is the output of error amplifier
GM. Pins V PROG and V OSENSE , described in the Pin Func-
tions section, allow GM to receive an output feedback
voltage V FB from either the internal or external resistive
dividers. When the load current increases, it causes a
slight decrease in V FB relative to the 1.19V reference,
which in turn causes the I TH voltage to increase until the
average inductor current matches the new load current.
6
The main control loop is shut down by pulling the RUN/SS
pin low. Releasing RUN/SS allows an internal 3 μ A current
source to charge up the soft start capacitor C SS . When C SS
reaches 1.3V, the main control loop is enabled with the I TH
voltage clamped at approximately 30% of its maximum
value. As C SS continues to charge, I TH is gradually re-
leased allowing normal operation to resume.
Comparator OVDET guards against transient overshoots
> 7.5% by turning off the P-channel power MOSFETs and
keeping them off until the fault is removed.
Low Current Operation
The LTC1433/LTC1434 have two internal P-channel
MOSFETs sized for low and high load current conditions.
At low load current, only the small MOSFET will be turned
on while at high load current both MOSFETs will be on.
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LTC1433IGN#PBF 功能描述:IC REG BUCK 3.3V/5V/ADJ 16SSOP 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
LTC1433IGN#TR 功能描述:IC REG BUCK 3.3V/5V/ADJ 16SSOP RoHS:否 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
LTC1433IGN#TRPBF 功能描述:IC REG BUCK 3.3V/5V/ADJ 16SSOP 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
LTC1434CGN 功能描述:IC REG BUCK 3.3V/5V/ADJ 20SSOP 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:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V,1.5V,1.8V,2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP,10-MSOP(0.118",3.00mm 宽)裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘