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| 型号： | LT3464ETS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 115MA TSOT23-8 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 34 V |
| 输入电压： | 2.3 V ~ 10 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 115mA |
| 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-23-8 薄型，TSOT-23-8 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-8 |
THE SMALL SIZE AND LOW ESR OF CERAMIC CAPACITORS MAKES
THEM SUITABLE FOR LT3464 APPLICATIONS. X5R AND X7R TYPES
ARE RECOMMENDED BECAUSE THEY RETAIN THEIR CAPACITANCE
OVER WIDER VOLTAGE AND TEMPERATURE RANGES THAN OTHER
TYPES SUCH AS Y5V OR Z5U. A 1 μ F INPUT CAPACITOR AND A
THAN 1.5V, WHICH CAN BE DONE BY TYING IT TO V IN . WHEN THE
0.22 μ F TO 0.47 μ F OUTPUT CAPACITOR ARE SUFFICIENT FOR MOST
LT3464 APPLICATIONS. ALWAYS USE A CAPACITOR WITH A SUFFI-
CIENT VOLTAGE RATING. TABLE 2 SHOWS A LIST OF SEVERAL CAPACI-
TOR MANUFACTURERS. CONSULT THE MANUFACTURERS FOR MORE
LT3464
APPLICATIO S I FOR ATIO
Capacitor Selection USER TO SELECT BETWEEN USING THE BUILT-IN REFERENCE, AND
SUPPLYING AN EXTERNAL REFERENCE VOLTAGE. THE VOLTAGE AT THE
CTRL PIN CAN BE ADJUSTED WHILE THE CHIP IS OPERATING TO
ALTER THE OUTPUT VOLTAGE OF THE LT3464 FOR PURPOSES SUCH
AS DISPLAY DIMMING OR CONTRAST ADJUSTMENT. TO USE THE
INTERNAL 1.25V REFERENCE, THE CTRL PIN MUST BE HELD HIGHER
CTRL PIN IS HELD BETWEEN 0V AND 1.2V THE LT3464 WILL
REGULATE THE OUTPUT SUCH THAT THE FB PIN VOLTAGE IS EQUAL TO
THE CTRL PIN VOLTAGE.
DETAILED INFORMATION AND FOR THEIR ENTIRE SELECTION OF RELATED TO SET THE OUTPUT VOLTAGE, SELECT THE VALUES OF R1 AND R2
PARTS. ACCORDING TO THE FOLLOWING EQUATION (SEE FIGURE 4).
R 2 = R 1 ? OUT – 1 ?
Table 2. Recommended Ceramic Capacitor Manufacturers
MANUFACTURER PHONE URL
TAIYO YUDEN 408-573-4150 WWW.T-YUDEN.COM
? V ?
? V REF ?
AVX
MURATA
KEMET
843-448-9411
814-237-1431
408-986-0424
WWW.AVXCORP.COM
WWW.MURATA.COM
WWW.KEMET.COM
WHERE V REF =1.25V IF THE INTERNAL REFERENCE IS USED, OR
V REF = V CTRL IF V CTRL IS BETWEEN 0V AND 1.2V.
THE TOP OF THE FEEDBACK DIVIDER MAY BE CONNECTED TO THE
THE LT3464 ALSO INCLUDES AN ON-CHIP PHASE-LEAD CAPACITOR OUT PIN WILL BOUNCE UP TO THE VOLTAGE ON THE CAP PIN,
BETWEEN THE CAP PIN AND THE FB PIN TO GREATLY REDUCE
RIPPLE; HOWEVER, CERTAIN APPLICATIONS CAN BENEFIT FROM
ADDITIONAL CAPACITANCE IN PARALLEL WITH THE INTEGRATED CA-
PACITOR, WHICH MAY BE ADDED EXTERNALLY BETWEEN THE CAP
AND FB PINS. TYPICAL EFFECTIVE VALUES RANGE FROM 4.7PF TO
THE LT3464 IS EQUIPPED WITH BOTH AN INTERNAL 1.25V
REFERENCE AND AN AUXILIARY REFERENCE INPUT. THIS ALLOWS THE
Choosing a Feedback Node
Output Voltage Ripple
USING LOW ESR CAPACITORS WILL HELP MINIMIZE THE OUTPUT OUT PIN OR TO THE CAP PIN (SEE FIGURE 4). REGULATING THE
RIPPLE VOLTAGE, BUT PROPER SELECTION OF THE INDUCTOR AND THE OUT PIN ELIMINATES THE OUTPUT OFFSET RESULTING FROM THE
OUTPUT CAPACITOR ALSO PLAYS A BIG ROLE. THE LT3464 PRO- VOLTAGE DROP ACROSS THE OUTPUT DISCONNECT. HOWEVER, IN
VIDES ENERGY TO THE LOAD IN BURSTS BY RAMPING UP THE THE CASE OF A SHORT-CIRCUIT FAULT AT THE OUT PIN, THE LT3464
INDUCTOR CURRENT, THEN DELIVERING THAT CURRENT TO THE LOAD. WILL SWITCH CONTINUOUSLY BECAUSE THE FB PIN IS LOW. WHILE
IF TOO LARGE AN INDUCTOR VALUE OR TOO SMALL A CAPACITOR VALUE OPERATING IN THIS OPEN-LOOP CONDITION, THE RISING VOLTAGE AT
IS USED, THE OUTPUT RIPPLE VOLTAGE WILL INCREASE BECAUSE THE THE CAP PIN IS LIMITED ONLY BY THE CURRENT LIMIT OF THE OUTPUT
CAPACITOR WILL BE SLIGHTLY OVERCHARGED EACH BURST CYCLE. TO DISCONNECT. GIVEN WORST-CASE PARAMETERS THIS VOLTAGE
REDUCE THIS EFFECT, A LARGER OUTPUT CAPACITOR MAY BE USED. MAY REACH 25V. WHEN THE SHORT-CIRCUIT IS REMOVED, THE
POTENTIALLY EXCEEDING THE SET OUTPUT VOLTAGE UNTIL THE
CAPACITOR VOLTAGES FALL BACK INTO REGULATION. WHILE THIS IS
HARMLESS TO THE LT3464, THIS SHOULD BE CONSIDERED IN THE
CONTEXT OF THE EXTERNAL CIRCUITRY IF SHORT-CIRCUIT EVENTS ARE
EXPECTED.
20PF. SINCE THE FB PIN SITS AT A LOW VOLTAGE, BE SURE THE REGULATING THE CAP PIN ENSURES THAT THE VOLTAGE ON THE
CHOSEN CAPACITOR HAS A SUFFICIENT VOLTAGE RATING. OUT PIN NEVER EXCEEDS THE SET OUTPUT VOLTAGE AFTER A SHORT-
CIRCUIT EVENT. HOWEVER, THIS SETUP DOES NOT COMPENSATE
Setting Output Voltage and the FOR THE VOLTAGE DROP ACROSS THE OUTPUT DISCONNECT, RESULT-
Auxiliary Reference Input ING IN AN OUTPUT VOLTAGE THAT IS SLIGHTLY LOWER THAN THE
VOLTAGE SET BY THE RESISTOR DIVIDER. THE NEXT SECTION DIS-
CUSSES HOW TO COMPENSATE FOR THIS DROP.
3464f
9
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