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| 型号： | MAX1714AEEP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
High-Speed Step-Down Controller
for Notebook Computers
+5V
V IN = 7V TO 24V*
1 μ F
20 ?
V+
ILIM V CC
V DD
5 ?
1 μ F
C1
BST
ON/OFF
SHDN
DH
0.1 μ F
Q1
0.5 μ H
R1
2.5V AT 7A
SKIP
MAX1714
LX
FB
DL
Q2
C2
CPU
0.22 μ F
REF
PGND (GND)
AGND (GND)
1k
R2
OUT
* FOR HIGHER MINIMUM INPUT VOLTAGE,
TON
C1 = 2 x 10 μ F/25V TAIYO YUDEN (1812) (TMK432BJ106AM)
C2 = 6 x 47 μ F/6.3V TAIYO YUDEN (1812) (JMK432BJ476MN)
R1 + R2 = 5m ? MINIMUM OF PCB TRACE RESISTANCE (TOTAL)
* LESS OUTPUT CAPACITANCE IS ACCEPTABLE.
Figure 7. All-Ceramic-Capacitor Application
( ) ARE FOR THE MAX1714B ONLY.
Table 5. Approximate K-Factor Errors
TON K APPROXIMATE MIN V IN
SETTING FACTOR K-FACTOR AT V OUT = 2V
(kHz) (μs) ERROR (%) (V)
Remember to include inductor resistance and MOSFET
on-state voltage drops (V SW ) when doing worst-case
dropout duty-factor calculations.
All-Ceramic-Capacitor Application
200
300
450
600
5
3.3
2.2
1.7
±10
±10
±12.5
±12.5
2.6
2.9
3.2
3.6
Ceramic capacitors have advantages and disadvan-
tages. They have ultra-low ESR, are noncombustible, are
relatively small, and are nonpolarized. On the other
hand, they’re expensive and brittle, and their ultra-low
ESR characteristic can result in excessively high ESR
zero frequencies (affecting stability). In addition, their rel-
atively low capacitance value can cause output over-
and bulk output capacitance must often be added (see
the V SAG equation in Transient Response section).
Dropout Design Example: V IN = 3V min, V OUT = 2V,
f = 300kHz. The required duty is (V OUT + V SW ) / (V IN -
V SW ) = (2V + 0.1V) / (3.0V - 0.1V) = 72.4%. The worst-
case on-time is (V OUT + 0.075) / V IN · K = 2.075V / 3V ·
3.35μs-V · 90% = 2.08μs. The IC duty-factor limitation is:
shoot when going abruptly from full-load to no-load
conditions, unless there are some bulk tantalum or elec-
trolytic capacitors in parallel to absorb the stored energy
in the inductor. In some cases, there may be no room for
electrolytics, creating a need for a DC-DC design that
uses nothing but ceramics.
The all-ceramic-capacitor application of Figure 7
replaces the standard, typical tantalum output capacitors
DUTY =
t ON(MIN)
t ON(MIN) + t OFF(MAX)
=
2.08 μ s
2.08 μ s + 500ns
= 80.6%,
with ceramics in a 7A circuit. This design relies on hav-
ing a minimum of 5m ? parasitic PC board trace resis-
tance in series with the capacitor in order to reduce the
which meets the required duty.
ESR zero frequency. This small amount of resistance is
easily obtained by locating the MAX1714 circuit 2 or 3
inches away from the CPU, and placing all the ceramic
______________________________________________________________________________________
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相关代理商/技术参数 |
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|---|---|
| MAX1714AEEP-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1714AEVKIT | 功能描述:电流型 PWM 控制器 Evaluation Kit for the MAX1714A RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1714BEEE | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1714BEEE+ | 功能描述:电流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1714BEEE+T | 功能描述:电流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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