参数资料
| 型号： | XRP7659ISTR-F |
| 厂商： | Exar Corporation |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A SOT-23-6 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.81 V ~ 15 V |
| 输入电压： | 4.5 V ~ 18 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 1.5A |
| 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-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-23-6 |
| 其它名称： | 1016-1751-6 |
X R P 7 6 5 9
1 . 5 A 1 8 V 1 . 4 M H z N o n S y n c h r o n o u s S t e p - D o w n R e g u l a t o r
VOUT
1.8V
2.5V
3.3V
5.0V
R1(k?)
100
39
43
47
Table 1: Resistor Selection
R2(k?)
82
18.7
14
9.09
SELECTING THE OUTPUT CAPACITOR
The output capacitor C OUT filters the inductor
current ripple, providing DC to the load. C OUT
also limits the V OUT transients arising from a
sudden current load step. A 22μF ceramic
capacitor is sufficient for most applications.
V OUT ? ? V IN ? V OUT ?
SELECTING THE INDUCTOR
Select the inductor for inductance L, saturation
current I sat and DC current I DC . I sat and I DC
should be larger than 2.4A and 2.2A
respectively. This will allow the inductor to
withstand an accidental overload until the IC’s
OCP get activated. Calculate the inductance
from:
L ?
V IN ? ? I L ? f s
ΔI L is inductor current ripple, nominally set at
30% of I OUT .
SELECTING THE INPUT CAPACITOR
The input capacitor C IN supplies the pulsating
input current resulting from fast switching of
the high-side MOSFET. Ceramic capacitors are
recommended because they have low ESR/ESL
and can therefore meet the high di/dt
requirement. A 10μF capacitor is sufficient for
most applications.
PCB LAYOUT GUIDELINES
Following guidelines will help safeguard
against EMI related problems.
1. Minimize the loop area among C IN , high-
side MOSFET and D1. To achieve this, C IN
and D1 have to be placed as closed to IC
pins IN and SW as possible. Also the
ground return of C IN and D1 should be
close. Use short and wide traces for
connecting these components.
2. Minimize the loop area among D1, L1 and
C OUT . Use short and wide traces for
connecting these components.
3. From the above it follows that the ground
returns of C IN , D1 and C OUT should be as
close as possible.
4. Route the sensitive FB trace away from
noisy SW.
? 2012 Exar Corporation
7/10
Rev. 1.2.0
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