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参数资料
| 型号： | MAX742CWP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 20-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 36 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 200kHz |
| 占空比： | 90% |
| 电源电压： | 4.2 V ~ 10 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 管件 |
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
Table 1. Trouble-Shooting Chart
___________________Chip Topography
SYMPTOM
CORRECTION
Unstable Output.
Noise or jitter on
output ripple
waveform. Scope
Loop stability problem.
A. CC+ or CC- disconnected.
B. EMI: Move inductor away from IC or use
shielded inductors. Keep noise sources
AGND
CC+ FB+ CSH+ CSL+
GND
may not trigger
correctly.
away from CC- and CC+.
C. Grounding: Tie AGND directly to the filter
capacitor ground lead. Ensure that cur-
AV+
EXT+
rent spikes from GND do not cause noise
at AGND or compensation capacitor or
reference bypass ground leads. Use wide
PC traces or a ground plane.
D. Bypass: Tie 10μF or larger between AGND
PUMP
and VREF. Use 150μF to bypass the input
right at AV+. If there is high source resis-
tance, 1000μF or more may be required.
E. Current limiting: Reduce load currents.
Ensure that inductors are not saturating.
F. Slope compensation: Inductor value not
matched to sense resistor.
100/200
12/15
0.135"
(3.45mm)
PDRV
Noisy Output.
Switching is
steady, but large
inductive spikes
are seen at the
outputs.
A. Ground noise: Probe ground is picking up
switching EMI. Reduce probe ground lead
length (use probe tip shield) or put circuit
in shielded enclosure.
B. Poor HF response: Add ceramic or
tantalum capacitors in parallel with output
VREF
EXT-
V+
filter capacitors.
Self-Destruction. A. Input overvoltage: Never apply more
SS
CC- FB- CSL- CSH-
Transistors or IC
die on power-up.
Poor Efficiency.
Supply current is
high. Output will
not drive heavy
loads.
No Output. +VO
= 5V or less. -VO
= 0V.
No Switching.
±VO are correct,
but no waveform is
seen at LX+ or LX-.
than +12V.
B. FB+ or FB- disconnected or shorted. This
causes runaway and output overvoltage.
C. CC+ or CC- shorted.
D. Output filter capacitor disconnected.
A. Inductor saturation: Peak currents
exceed coil ratings.
B. MOSFET on-resistance too high.
C. Switching losses: Diode is slow or has high
forward voltage. Inductor has high DC resis-
tance. Excess capacitance at LX nodes.
D. Inductor core losses: Hysteresis losses
cause self-heating in some core materials.
E. Loop instability: See Unstable Output
above.
A. Check connections. VREF should be +2V.
B. When input voltage is less than +4.2V,
undervoltage lockout is enabled.
Output is unloaded. Apply ±30mA or
greater load to observe waveform.
0.080"
(2.03mm)
TRANSISTOR COUNT: 375
SUBSTRATE CONNECTED TO V+
12
______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX742CWP+ | 功能描述:直流/直流开关调节器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX742CWP+T | 功能描述:直流/直流开关调节器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX742CWP-T | 功能描述:直流/直流开关调节器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX742EPP | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX742EPP+ | 功能描述:直流/直流开关调节器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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