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| 型号： | MAX1993ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/36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
Table 6. Fault Protection and Shutdown Setting Truth Table
OVP/UVP SHDN DISCHARGE*
Yes.
UVP PROTECTION
Enabled.
OVP PROTECTION
Enabled.
THERMAL PROTECTION
Enabled.
V CC
Open
DL forced high when
shut down.
Yes.
DL forced high when
Discharge sequence activated;
DL forced high when shut down.
Disabled.
DH pulled low and
DL forced high.
Enabled.
DH pulled low and
Discharge sequence activated;
DL forced high when shut down.
Enabled.
Discharge sequence activated;
shut down.
No.
Enabled.
DL forced high.
DL forced high when shut down.
Enabled.
REF
DL forced low when
shut down.
Discharge sequence activated;
DL forced high when shut down.
Disabled.
Discharge sequence activated;
DL forced high when shut down.
No.
Enabled.
GND
DL forced low when
Disabled.
Disabled.
Discharge sequence activated;
V OUT FB ? 1 + C ?
= V
shut down.
* Discharge-mode state latched on power-up.
Undervoltage Protection (UVP)
When the output voltage drops below 70%, the nominal
regulation voltage and the UVP are enabled (OVP/UVP =
V CC or REF), and the controller sets the fault latch and
begins the discharge mode (see the Shutdown and
Output Discharge section). When the output voltage
drops to 0.3V, the synchronous rectifiers turn on, clamp-
ing the outputs to GND. UVP is ignored for at least 10ms
(min) after startup ( SHDN rising edge) and when transi-
tions are detected on GATE (MAX1993 only, FBLANK
enabled). Toggle SHDN or cycle V CC power below 1V to
clear the fault latch and restart the controller.
UVP is disabled when OVP/UVP is left open or connect-
ed to GND (Table 6).
Thermal Fault Protection
DL forced high when shut down.
Setting V OUT with a Resistive Voltage-Divider at FB
The output voltage can be adjusted from 0.7V to 5.5V
using a resistive voltage-divider (Figure 8). The MAX1992
regulates FB to a fixed reference voltage (0.7V).
Alternatively, the MAX1993 regulates FB to the voltage
set at REFIN, making the MAX1993 ideal for memory
applications in which the termination supply must track
the supply voltage. The adjusted output voltage is:
? R ?
? R D ?
where V FB is 0.7V for the MAX1992 and V FB = V REFIN
for the MAX1993.
The MAX1992/MAX1993 feature a thermal fault protec-
tion circuit. When the junction temperature rises above
+160°C, a thermal sensor activates the fault latch, pulls
PGOOD low, and shuts down using discharge mode
regardless of the OVP/UVP setting. Toggle SHDN or
FB
TO ERROR
AMPLIFIER
MAX1992
OUT
1.8V (FIXED)
cycle V CC power below 1V to reactivate the controller
after the junction temperature cools by 15°C.
Output Voltage
Preset Output Voltages (MAX1992 Only)
The MAX1992’s Dual Mode operation allows the selec-
tion of common voltages without requiring external
components (Figure 7). Connect FB to AGND for a
fixed 2.5V output, to V CC for a fixed 1.8V output, or con-
nect FB directly to OUT for a fixed 0.7V output.
REF
(2.0V)
0.1 x REF
(0.2V)
Figure 7. Dual-Mode Feedback Decoder (MAX1992)
2.5V (FIXED)
______________________________________________________________________________________
23
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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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