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参数资料
| 型号： | MAX1993ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 系列： | Quick-PWM™ |
| 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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Quick-PWM Step-Down Controllers with Inductor
Saturation Protection and Dynamic Output Voltages
The MAX1993 automatically enters forced-PWM opera-
LX
L
R SENSE
tion on the rising and falling edges of GATE and
remains in forced-PWM mode for a minimum time
MAX1992
MAX1993
DL
N L
C OUT
selected by FBLANK (Table 5). Forced-PWM operation
is required to ensure fast, accurate negative voltage
PGND
AGND
CSP
CSN
transitions when REFIN is lowered. Because forced-
PWM operation disables the zero-crossing comparator,
the inductor current can reverse under light loads,
quickly discharging the output capacitors. If fault blank-
ing is enabled, the MAX1993 also disables the overvolt-
age and undervoltage fault protection and forces
PGOOD to a high-impedance state for the period
selected by FBLANK (Table 5).
OUT
R C
For a step voltage change at REFIN, the rate of change
? R 5 × ( R 6 + R 7 ) ?
? ? R 5 + ( R 6 + R 7 ) ? ?
FB
R D
Figure 8. Setting V OUT with a Resistive Voltage-Divider
Dynamic Output Voltages (MAX1993 Only)
The MAX1993 regulates FB to the voltage set at REFIN.
By changing the voltage at REFIN, the MAX1993 can
be used in applications that require dynamic output
voltage changes between two set points. Figure 9
shows a dynamically adjustable resistive voltage-
divider network at REFIN. Using the GATE signal and
open-drain output (OD), a resistor can be switched in
and out of the REFIN resistor-divider, changing the volt-
age at REFIN. A logic high on GATE turns on the inter-
nal N-channel MOSFET, forcing OD to a low-
impedance state. A logic low on GATE disables the N-
channel MOSFET, so OD is high impedance. The two
output voltages (FB = OUT) are determined by the fol-
lowing equations:
of the output voltage is limited by the inductor current
ramp, the total output capacitance, the current limit, and
the load during the transition. The inductor current ramp
is limited by the voltage across the inductor and the
inductance. The total output capacitance determines
how much current is needed to change the output volt-
age. Additional load current slows the output voltage
change during a positive REFIN voltage change, and
speeds the output voltage change during a negative
REFIN voltage change. Increasing the current-limit set-
ting speeds a positive output voltage change.
Adding a capacitor across REFIN and GND filters noise
and controls the rate-of-change of the REFIN voltage
during dynamic transitions. With the additional capaci-
tance, the REFIN voltage slews between the two set
points with a time constant determined by the equiva-
lent parallel resistance seen by the slew capacitor
(C REFIN ). Referring to Figure 9, the time constant for a
positive REFIN voltage transition is:
τ POS = ? ? C REFIN
and the time constant for a negative REFIN voltage
V OUT ( LOW ) = V REF ?
?
( ) 7 ? ?
? ? R 5 + ( R 6 + R 7 ) ? ?
τ NEG REFIN
= ?
? R 5 × R 6 ?
? R 5 + R 6 ?
? R 6 ?
? R 5 + R 6 ?
? R 6 + R
V OUT ( HIGH ) = V REF ?
transition is:
? C
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1993ETG+ | 功能描述:电压模式 PWM 控制器 Step-Down w/Inductor RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1993ETG+T | 功能描述:电压模式 PWM 控制器 Step-Down w/Inductor RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1993ETG+TG40 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1993ETG-T | 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1993EVKIT | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR THE MAX1992 MAX1993 - Bulk |
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