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参数资料
| 型号： | LT3510EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A DL 20TSSOP |
| 标准包装： | 74 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 23.8 V |
| 输入电压： | 3.1 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 250kHz ~ 1.5MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-TSSOP-EP |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
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LT3510
APPLICATIONS INFORMATION
Choosing the Output Voltage
1600
190
R1 = R2 ? ? OUT – 1 ?
Theoutputvoltageisprogrammedwitharesistordivider
between the output and the FB pin. Choose the 1% resis-
tors according to:
? V ?
? 0.8V ?
R2 should be 10k or less to avoid bias current errors. Refer-
1400
1200
1000
800
600
400
200
FREQUENCY
PHASE
185
180
175
170
165
160
155
ence designators refer to the Block Diagram in Figure 1.
100
0
20
40
60 80 100
120
140
150
Choosing the Switching Frequency
RESISTANCE (kΩ)
3510 F02
Max Frequency =
3.3 + 0.6 1
The LT3510 switching frequency is set by resistor R3 in
Figure 1. The R T /SYNC pin is internally regulated at 0.975V.
Setting resistor R3 sets the current in the R T /SYNC pin
which determines the oscillator frequency as illustrated
in Figure 2.
The switching frequency is typically set as high as pos-
sible to reduce overall solution size. The LT3510 employs
techniques to enhance dropout at high frequencies but
ef?ciency and maximum input voltage decrease due to
switching losses and minimum switch on times. The
maximum recommended frequency can be approximated
by the equation:
Figure 2. Frequency and Phase vs R T /SYNC Resistance
The following example along with the data in Table 1
illustrates the tradeoffs of switch frequency selection.
Example.
V IN = 25V, V OUT = 3.3V, I OUT = 2.5A,
Temperature = 0°C to 85°C
t ON(MIN) = 200ns (85°C from the Typical Performance
Characteristics graph), V D = 0.6V, V SW = 0.4V (85°C)
? ~ 750 kHz
25 – 0.4 + 0.6 200e-9
V OUT + V D 1
V IN – V SW + V D t ON(MIN)
Frequency (Hz)=
?
R T /SYNC ~ 42k (Figure 2)
Input Voltage Range
where V D is the forward voltage drop of the catch diode (D1
Figure 2), V SW is the voltage drop of the internal switch,
and t ON(MIN) in the minimum on time of the switch, all at
maximum load current.
Once the switching frequency has been determined, the
input voltage range of the regulator can be determined.
The minimum input voltage is determined by either the
LT3510’s minimum operating voltage of ~2.8V, or by its
Table 1. Ef?ciency and Size Comparisons for Different R RT/SYNC Values. 3.3V
Output
FREQUENCY R T /SYNC
EFFICIENCY
V VIN1/2 = 12V V IN(MAX)?
L* C* L + C AREA
1.2MHz 20.5k 79.0% 16 1.5μH 22μF 63mm 2
1.0MHz 26.7k 80.9% 18 2.2μH 47μF 66mm 2
750kHz 38.3k 81.2% 22 3.3μH 47μF 66mm 2
500kHz 61.9k 82.0% 24 4.7μH 47μF 66mm 2
250kHz 133k 83.9% 24 10μH 100μF 172mm 2
? V
IN(MAX) is de?ned as the highest input voltage that maintains constant output voltage ripple.
*Inductor and capacitor values chosen for stability and constant ripple current.
3510fe
12
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| LT3510IFE#PBF | 功能描述:IC REG BUCK ADJ 2A DL 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
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