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参数资料
| 型号： | LTC3406BES5-1.2#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.3 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | PLASTIC, MO-193, TSOT-23, 5 PIN |
| 文件页数： | 9/12页 |
| 文件大小： | 264K |
| 代理商： | LTC3406BES5-1.2#PBF |
6
LTC3406B-1.2
sn3406b12 3406b12fs
FU CTIO AL DIAGRA
U
W
+
–
+
–
EA
+
–
IRCMP
+
–
ICOMP
5
1
RUN
OSC
SLOPE
COMP
OSC
FREQ
SHIFT
0.8V
FB
0.8V + VOVL
60k
120k
0.8V REF
SHUTDOWN
VIN
VOUT
VIN
S
R
RS LATCH
OV
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
Q
5
4
SW
3
GND
3406B12 BD
2
+
–
OVDET
OPERATIO
U
(Refer to Functional Diagram)
Main Control Loop
The LTC3406B-1.2 uses a constant frequency, current
mode step-down architecture. Both the main (P-channel
MOSFET) and synchronous (N-channel MOSFET) switches
are internal. During normal operation, the internal top
power MOSFET is turned on each cycle when the oscillator
sets the RS latch, and turned off when the current com-
parator, ICOMP, resets the RS latch. The peak inductor
current at which ICOMP resets the RS latch, is controlled by
the output of error amplifier EA. When the load current
increases, it causes a slight decrease in the feedback
voltage, FB, relative to the 0.8V reference, which in turn
causes the EA amplifier’s output voltage to increase until
the average inductor current matches the new load cur-
rent. While the top MOSFET is off, the bottom MOSFET is
turned on until either the inductor current starts to reverse,
as indicated by the current reversal comparator IRCMP, or
the beginning of the next clock cycle. The comparator
OVDET guards against transient overshoots >6.25% by
turning the main switch off and keeping it off until the fault
is removed.
Pulse Skipping Mode Operation
At light loads, the inductor current may reach zero or re-
verse on each pulse. The bottom MOSFET is turned off by
the current reversal comparator, IRCMP, and the switch
voltage will ring. This is discontinuous mode operation,
and is normal behavior for the switching regulator. At very
light loads, the LTC3406B-1.2 will automatically skip pulses
in pulse skipping mode operation to maintain output regu-
lation. Refer to LTC3406-1.2 data sheet if Burst Mode op-
eration is preferred.
Short-Circuit Protection
When the output is shorted to ground, the frequency of the
oscillator is reduced to about 210kHz, 1/7 the nominal
frequency. This frequency foldback ensures that the in-
ductor current has more time to decay, thereby preventing
runaway. The oscillator’s frequency will progressively
increase to 1.5MHz when VOUT rises above 0V.
Figure 1. Typical Application
VIN
CIN**
4.7F
CER
VIN
2.7V
TO 5.5V
*
**
LTC3406B-1.2
RUN
3
2.2H*
3406B12 F01
MURATA LQH3C2R2M24
TAIYO YUDEN JMK212BJ475MG
TAIYO YUDEN JMK316BJ106ML
5
4
1
2
SW
VOUT
GND
COUT
10F
CER
VOUT
1.2V
600mA
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3406BES5TRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 5.5V TSOT23-5 |
| LTC3406ES5 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 5-Pin TSOT-23 |
| LTC3406ES5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 5-Pin TSOT-23 制造商:Linear Technology 功能描述:IC DC-DC CONV 1.5 MHz 5-SOT-23 制造商:Linear Technology 功能描述:BUCK 5.5VIN 1.5MHZ 0.6A 5TSOT23 制造商:Linear Technology 功能描述:BUCK, 5.5VIN, 1.5MHZ, 0.6A, 5TSOT23 制造商:Linear Technology 功能描述:IC, DC-DC CONV, 1.5 MHz, 5-SOT-23; Primary Input Voltage:5.5V; No. of Outputs:1; Output Voltage:600mV; Output Current:600mA; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:5-SOT-23 ;RoHS Compliant: Yes |
| LTC3406ES5#TR | 功能描述:IC REG BUCK SYNC ADJ TSOT23-5 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 |
| LTC3406ES5#TRM | 功能描述:IC REG BUCK SYNC ADJ TSOT23-5 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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