參數(shù)資料
型號(hào): LTC1265-5
廠商: Linear Technology Corporation
英文描述: 1.2A, High Efficiency Step-Down Current Mode DC/DC Converter(5V,12A,高效率,電流模式步降DC/DC變換器)
中文描述: 1.2A的,高效率降壓型電流模式的DC / DC轉(zhuǎn)換器(5V的,12A條,高效率,電流模式步降直流/直流變換器)
文件頁(yè)數(shù): 11/16頁(yè)
文件大?。?/td> 233K
代理商: LTC1265-5
11
LTC1265/LTC1265-3.3/LTC1265-5
Figure 7. C
T
Waveforms
Troubleshooting Hints
Since efficiency is critical to LTC1265 applications, it is
very important to verify that the circuit is functioning
correctly in both continuous and Burst Mode operation. As
the LTC1265 is highly tolerant of poor layout, the output
voltage will still be regulated. Therefore, monitoring the
output voltage will not tell you whether you have a good or
bad layout. The waveform to monitor is the voltage on the
timing capacitor Pin 5.
In continuous mode the voltage on the C
T
pin is a sawtooth
with approximately 0.9V
P-P
swing. This voltage should
never dip below 2V as shown in Figure 7a.
When the load currents are low (I
LOAD
< I
BURST
) Burst
Mode operation occurs. The voltage on C
T
pin now falls to
ground for periods of time as shown in Figure 7b. During
this time the LTC1265 is in sleep mode with quiescent
current reduced to 160
μ
A.
The inductor current should also be monitored. If the
circuit is poorly decoupled, the peak inductor current will
be haphazard as in Figure 8a. A well decoupled LTC1265
has a clean inductor current as in Figure 8b.
Figure 6. LTC1265 Layout Diagram (See Board Layout Checklist)
V
IN
V
IN
LB
OUT
LB
IN
C
T
I
TH
SENSE
1000pF
1000pF
LTC1265
SENSE
+
N/C (V
FB
)
SHDN
SGND
PGND
PWR V
IN
SW
14
13
12
11
10
9
8
C
IN
D1
0.1
μ
F
C
OUT
R
SENSE
L
V
OUT
OUTPUT DIVIDER REQUIRED
WITH ADJUSTABLE VERSION ONLY
PWR V
IN
1k
3900pF
1
2
3
4
5
6
7
LTC1265 F06
SHDN
BOLD LINES INDICATE
HIGH PATH CURRENTS
R1
R2
+
+
3.3V
2.4V
0V
TIME
LTC1265 F07a
(a) CONTINUOUS MODE OPERATION
V
T
3.3V
2.4V
0V
TIME
LTC1265 F07b
(b) Burst Mode OPERATION
V
T
SLEEP MODE
APPLICATIOU
W
U
U
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LTC1265CS#TR 功能描述:IC REG BUCK ADJ 1.2A 14SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓(降壓) 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V,1.5V,1.8V,2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬)裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
LTC1265CS#TRPBF 功能描述:IC REG BUCK ADJ 1.2A 14SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓(降壓) 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V,1.5V,1.8V,2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬)裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
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