- 您现在的位置：买卖IC网 > PDF目录1841 > MAX1992ETG+T (Maxim Integrated Products)IC REG CTRLR BUCK PWM CM 24-TQFN PDF资料下载
参数资料
| 型号： | MAX1992ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-TQFN |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
Quick-PWM Step-Down Controllers with Inductor
Saturation Protection and Dynamic Output Voltages
Pin Description (continued)
MAX1992
PIN
MAX1993
NAME
FUNCTION
Inductor Saturation Control Input. This four-level logic input sets the inductor current
saturation limit as a multiple of the valley current-limit threshold set by ILIM, or
disables the function if not required. Connect LSAT to the following pins to set the
saturation current limit:
3
3
LSAT
V CC = 2 × I LIM(VAL)
Open = 1.75 × I LIM(VAL)
REF = 1.5 × I LIM(VAL)
AGND = disable LSAT protection
See the Inductor Saturation Limit and Setting the Current Limit sections.
Open-Drain Power-Good Output. PGOOD is low when the output voltage is more than
10% (typ) above or below the normal regulation point, during soft-start, and in
4
4
PGOOD
shutdown. After the soft-start circuit has terminated, PGOOD becomes high
impedance if the output is in regulation. For the MAX1993, PGOOD is
blanked—forced high-impedance state—when FBLANK is enabled and the controller
detects a transition on GATE.
Valley Current-Limit Threshold Adjustment. The valley current-limit threshold defaults
to 50mV if ILIM is tied to V CC . In adjustable mode, the valley current-limit threshold
5
5
ILIM
across CSP and CSN is precisely 1/10th the voltage seen at ILIM over a 250mV to
2.5V range. The logic threshold for switchover to the 50mV default value is
approximately V CC - 1V. When the inductor saturation protection threshold is
exceeded, ILIM sinks 6μA. See the Current-Limit Protection (ILIM) section.
2.0V Reference Voltage Output. Bypass REF to analog ground with a 0.1μF or greater
6
6
REF
ceramic capacitor. The reference can source up to 50μA for external loads. Loading
REF degrades output voltage accuracy according to the REF load regulation error.
The reference is disabled when the MAX1992/MAX1993 is shut down.
—
—
7
8
REFIN
OD
External Reference Input. REFIN sets the feedback regulation voltage (V FB = V REFIN )
of the MAX1993.
Open-Drain Output. Controlled by GATE.
Feedback Input.
MAX1992: Connect to V CC for a +1.8V fixed output or to AGND for a +2.5V fixed
9
9
FB
output. For an adjustable output (0.7V to 5.5V), connect FB to a resistive divider from
the output voltage. The FB regulation level is +0.7V.
MAX1993: The FB regulation level is set by the voltage at REFIN.
Output Voltage Sense. Connect directly to the positive terminal of the output
capacitors as shown in the standard application circuits (Figures 1 and 9). OUT
senses the output voltage to determine the on-time for the high-side switching
10
10
OUT
MOSFET. For the MAX1992, OUT also serves as the feedback input when using the
preset internal output voltages as shown in Figure 7. When discharge mode is
enabled by OVP/UVP, the output capacitor is discharged through an internal 10 Ω
resistor connected between OUT and ground.
Positive Current-Sense Input. Connect to the positive terminal of the current-sense
11
11
CSP
element. Figure 10 and Table 7 describe several current-sensing options. The PWM
controller does not begin a cycle unless the current sensed is less than the valley
current-limit threshold programmed at ILIM.
12
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1997ETJ+T | IC PWR SUPPLY TFT LCD 32TQFN |
| MAX256ASA+T | IC DRVR H-BRIDGE 8-SOIC |
| MAX3273ETG+T | IC LASR DRVR 2.7GBPS 3.6V 24TQFN |
| MAX3296CTI+T | IC LASR DRVR 2.5GBPS 5.5V 28TQFN |
| MAX3353EEUE+T | IC CHARGE PUMP USB OTG 16TSSOP |
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 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+ | 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 |
发布紧急采购，3分钟左右您将得到回复。