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参数资料
| 型号： | MAX1993ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 32/36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
REF
B
R4
R1
REFIN
A
R3
C1
R2
MAX1993
GND
Figure 11. Multiple Output Voltage Settings
1k Ω
1k Ω
1000pF
1000pF
GATE
? + 0 . 1 V ? 0 . 1 V = 3 . 06 V
V IN ( MIN ) = ?
? 1 ? ? 1 . 5 × 500 ns ? ?
? ?
? ? ?
Calculating again with h = 1 and the typical K-factor
value (K = 3.3μs) gives the absolute limit of dropout:
? ?
? ?
? 2 . 5 V + 0 . 1 V
? ? ?
? 3 . 3 μ s
Therefore, V IN must be greater than 3.06V, even with very
large output capacitance, and a practical input voltage
with reasonable output capacitance would be 3.47V.
Multiple Output Voltage Settings
(MAX1993 Only)
While the MAX1993 is optimized to work with applica-
tions that require two dynamic output voltages, it can
produce three or more output voltages if required by
using discrete logic or a DAC.
Figure 11 shows an application circuit providing four
voltage levels using discrete logic. Switching resistors
in and out of the resistor network changes the voltage
at REFIN. An edge detection circuit is added to gener-
ate a 1μs pulse on GATE to trigger the fault-blanking
and forced-PWM operation. When using PWM mode
( SKIP = V CC ), the edge detection circuit is only
required if fault blanking is enabled. Otherwise, leave
OD unconnected.
Active Bus Termination (MAX1993 Only)
Active bus termination power supplies generate a volt-
age rail that tracks a set reference. They are required to
source and sink current. DDR memory architecture
requires active bus termination. In DDR memory archi-
tecture, the termination voltage is set at exactly half the
memory supply voltage. Configure the MAX1993 to
generate the termination voltage using a resistor-
divider at REFIN. In such an application, the MAX1993
must be kept in PWM mode ( SKIP = V CC ) in order for it
to source and sink current. Figure 12 shows the
MAX1993 configured as a DDR termination regulator.
Connect GATE and FBLANK to GND when unused.
Voltage Positioning
In applications where fast-load transients occur, the
output voltage changes instantly by ESR COUT x
Δ I LOAD . Voltage positioning allows the use of fewer out-
put capacitors for such applications, and maximizes
the output voltage AC and DC tolerance window in tight
tolerance applications.
Figure 13 shows the connection of OUT and FB in a
voltage-positioned circuit. In nonvoltage-positioned cir-
cuits, the MAX1992/MAX1993 regulate at the output
capacitor. In voltage-positioned circuits, the MAX1992/
MAX1993 regulate on the inductor side of the current-
sense resistor. V OUT is reduced to:
V OUT(VPS) = V OUT(NO LOAD) - R SENSE I LOAD
32
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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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