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参数资料
| 型号： | MAX8815AETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1A 10TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 3.3 V ~ 5 V |
| 输入电压： | 1.2 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 其它名称： | MAX8815AETB+TDKR |
1A, 97% Efficiency, 30μA Quiescent Current
Step-Up Converter with True Shutdown
Inductor Selection
In most step-up converter designs, a reasonable induc-
Table 1. Recommended Inductors
tor value can be derived from the following equation.
This equation sets peak-to-peak inductor current at 1/2
the DC inductor current:
L = (2 x V BATT x D x (1 - D))/(I OUT(MAX) x f SW )
where f SW is the switching frequency (2MHz), and D is
the duty factor given by D = 1 - (V BATT /V OUT ). Using L
from the equation above results in a peak-to-peak
inductor current ripple of 0.5 x I OUT /(1 - D), and a peak
inductor current of 1.25 x I OUT /(1 - D). Ensure that the
INDUCTOR
TOKO DE4012CK
A1101AS-1R0M
TOKO DE4012CK
A1101AS-2R2M
TOKO 2818C
1072AS-1R0M
L
(μH)
1
2.2
1
DCR
(m Ω )
45
60
40
I SAT
(A)
3.3
2.8
2.8
SIZE (mm)
4 x 4 x 1.2
4 x 4 x 1.2
2.8 x 2.8 x 1.8
peak (saturation) current rating of the inductor meets or
exceeds this requirement. The recommended induc-
tance range for the MAX8815A is 1μH to 2.2μH. See
Table 1 for recommended inductors.
Capacitor Selection
Output Capacitor
Output capacitor C2 in Figures 1a and 1b is required to
keep the output voltage ripple small and to ensure reg-
ulation loop stability. The output capacitors must have
low impedance at the switching frequency. Make sure
the output capacitors maintain their capacitance over
DC bias and the desired operating temperature range.
One 22μF tantalum capacitor is recommended.
Input Capacitor
Input capacitor C1 reduces the current peaks drawn
from the battery or input power source and reduce
switching noise in the IC. The impedance of the input
capacitor at the switching frequency should be kept
very low. A ceramic capacitor is highly recommended
due to their small size and low ESR. Make sure the
input capacitors maintain their capacitance over DC
bias and the desired operating temperature range.
Ceramic capacitors with X5R or X7R dielectric temper-
ature characteristics generally perform well. Two 4.7μF
or one 10μF ceramic capacitors are recommended.
PCB Layout and Routing
Good printed-circuit board (PCB) layout is important to
achieve optimal performance for the MAX8815A. Poor
design can cause excessive conducted and radiated
noise. Conductors carrying discontinuous currents and
any high-current path should be made as short and
wide as possible. Keep the feedback network (R1 and
R2) very close to the IC, preferably within 0.2in of the
FB and GND pins. Nodes with high dV/dt (switching
nodes) should be kept as small as possible and routed
away from FB. Connect the input and output capacitors
as close as possible to the IC. Refer to the MAX8815A
EV kit data sheet for a PCB layout example.
Chip Information
PROCESS: BiCMOS
12
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| MAX8815AEVKIT+ | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX8815A RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8818AETM+ | 功能描述:PMIC 解决方案 10Ch PMIC for 2-Cell Li+ DVC System RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8818AETM+T | 功能描述:PMIC 解决方案 10Ch PMIC for 2-Cell Li+ DVC System RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8818BETM+ | 功能描述:PMIC 解决方案 10Ch PMIC for 2-Cell Li+ DVC System RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX8818BETM+T | 功能描述:PMIC 解决方案 10Ch PMIC for 2-Cell Li+ DVC System RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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