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参数资料
| 型号： | LTC3204BEDC-5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP DBL 5V 6DFN |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵），倍增器 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 150mA |
| 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： | 6-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN-EP（2x2） |
LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
APPLICATIO S I FOR ATIO
CERAMIC CAPACITORS
GND
SHDN
C OUT
CERAMIC CAPACITORS OF DIFFERENT MATERIALS LOSE THEIR CAPACI-
TANCE WITH HIGHER TEMPERATURE AND VOLTAGE AT DIFFERENT RATES.
FOR EXAMPLE, A CAPACITOR MADE OF X5R OR X7R MATERIAL
WILL RETAIN MOST OF ITS CAPACITANCE FROM –40°C TO 85°C
WHEREAS A Z5U OR Y5V STYLE CAPACITOR WILL LOSE CONSIDERABLE
CAPACITANCE OVER THAT RANGE. Z5U AND Y5V CAPACITORS MAY
ALSO HAVE A POOR VOLTAGE COEF?CIENT CAUSING THEM TO LOSE
60% OR MORE OF THEIR CAPACITANCE WHEN THE RATED VOLTAGE
IS APPLIED. THEREFORE WHEN COMPARING DIFFERENT CAPACITORS,
IT IS OFTEN MORE APPROPRIATE TO COMPARE THE AMOUNT OF
ACHIEVABLE CAPACITANCE FOR A GIVEN CASE SIZE RATHER THAN
DISCUSSING THE SPECI?ED CAPACITANCE VALUE. FOR EXAMPLE,
OVER RATED VOLTAGE AND TEMPERATURE CONDITIONS, A 1μF 10V
Y5V CERAMIC CAPACITOR IN A 0603 CASE MAY NOT PROVIDE ANY
MORE CAPACITANCE THAN A 0.22μF 10V X7R CAPACITOR AVAIL-
ABLE IN THE SAME 0603 CASE. IN FACT, FOR MOST LTC3204-3.3/
LTC3204-5/LTC3204B-3.3/LTC3204B-5 APPLICATIONS, THESE
CAPACITORS CAN BE CONSIDERED ROUGHLY EQUIVALENT. THE
CAPACITOR MANUFACTURER’S DATA SHEET SHOULD BE CONSULTED
TO ENSURE THE DESIRED CAPACITANCE AT ALL TEMPERATURES AND
VOLTAGES.
BELOW IS A LIST OF CERAMIC CAPACITOR MANUFACTURERS AND
HOW TO CONTACT THEM:
AVX WWW.AVXCORP.COM
KEMET WWW.KEMET.COM
MURATA WWW.MURATA.COM
TAIYO YUDEN WWW.T-YUDEN.COM
VISHAY WWW.VISHAY.COM
TDK WWW.COMPONENT.TDK.COM
LAYOUT CONSIDERATIONS
DUE TO THE HIGH SWITCHING FREQUENCY AND HIGH TRANSIENT
CURRENTS PRODUCED BY LTC3204-3.3/LTC3204-5/LTC3204B-
3.3/LTC3204B-5, CAREFUL BOARD LAYOUT IS NECESSARY FOR
OPTIMUM PERFORMANCE. A TRUE GROUND PLANE AND SHORT
CONNECTIONS TO ALL THE EXTERNAL CAPACITORS WILL IMPROVE PER-
FORMANCE AND ENSURE PROPER REGULATION UNDER ALL CONDITIONS.
FIGURE 4 SHOWS AN EXAMPLE LAYOUT FOR THE LTC3204-3.3/
LTC3204-5/LTC3204B-3.3/LTC3204B-5.
C IN
0603
V IN C –
V OUT C FLY
0603
C +
0603
3204 F04
FIGURE 4. RECOMMENDED LAYOUT
THERMAL MANAGEMENT
FOR HIGHER INPUT VOLTAGES AND MAXIMUM OUTPUT CUR-
RENT, THERE CAN BE SUBSTANTIAL POWER DISSIPATION IN THE
LTC3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5. IF
THE JUNCTION TEMPERATURE INCREASES ABOVE APPROXIMATELY
160°C, THE THERMAL SHUTDOWN CIRCUITRY WILL AUTOMATICALLY
DEACTIVATE THE OUTPUT. TO REDUCE THE MAXIMUM JUNCTION
TEMPERATURE, A GOOD THERMAL CONNECTION TO THE PC BOARD
IS RECOMMENDED. CONNECTING THE GND PIN (PIN 1) AND
THE EXPOSED PAD OF THE DFN PACKAGE (PIN 7) TO A GROUND
PLANE UNDER THE DEVICE ON TWO LAYERS OF THE PC BOARD
CAN REDUCE THE THERMAL RESISTANCE OF THE PACKAGE AND PC
BOARD CONSIDERABLY.
DERATING POWER AT HIGH TEMPERATURES
TO PREVENT AN OVERTEMPERATURE CONDITION IN HIGH POWER
APPLICATIONS, FIGURE 5 SHOULD BE USED TO DETERMINE THE
MAXIMUM COMBINATION OF AMBIENT TEMPERATURE AND POWER
DISSIPATION.
THE POWER DISSIPATED IN THE LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5 SHOULD ALWAYS FALL UNDER THE
LINE SHOWN FOR A GIVEN AMBIENT TEMPERATURE. THE POWER
DISSIPATION IN THE LTC3204-3.3/ LTC3204-5/LTC3204B-3.3/
LTC3204B-5 IS GIVEN BY THE EXPRESSION:
P D = ( 2 V IN – V OUT ) ? I OUT
THIS DERATING CURVE ASSUMES A MAXIMUM THERMAL RESIS-
TANCE, θ JA , OF 80°C/W FOR THE 2MM × 2MM DFN PACKAGE.
3204fa
10
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