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参数资料
| 型号： | MAX1544ETL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 36/42页 |
| 文件大小： | 0K |
| 描述： | IC QUICK-PWM DUAL-PHASE 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，AMD Hammer |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 0.68 V ~ 1.55 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 管件 |
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Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
CMN
CMP
MAX1544
MAIN
PHASE
L1
R SENSE
R A
R B
PC BOARD TRACE
ERROR
OAIN+
R FBS
RESISTANCE
CPU SENSE
POINT
COMPARATOR
OAIN-
FB
R F
R A
R B
PC BOARD TRACE
RESISTANCE
V FB - V VPS + V DROP 1
V IN ( MIN ) = η OUTPH ?
? 1 - η OUTPH ? ?
? ?
? ?
?
V IN ( MIN ) = 2 x ?
1 - 2 x ( 0 . 4 μ s x 1 . 5 / 3 . 0 μ s ?
V IN ( MIN ) = 2 x ?
1 - 2 x ( 0 . 4 μ s x 1 . 0 / 3 . 0 μ s ?
SECOND
PHASE
CSP
CSN
Figure 10. Voltage-Positioning Gain
slew the inductor current higher in response to
increased load, and must always be greater than 1. As
h approaches 1, the absolute minimum dropout point,
the inductor current cannot increase as much during
each switching cycle and V SAG greatly increases
unless additional output capacitance is used.
A reasonable minimum value for h is 1.5, but adjusting
this up or down allows tradeoffs between V SAG , output
capacitance, and minimum operating voltage. For a
given value of h, the minimum operating voltage can be
calculated as:
? ?
? ?
?
? ? h x t OFF ( MIN ) ? ?
K
+ V DROP 2 - V DROP 1 + V VPS
where η OUTPH is the total number of out-of-phase switch-
ing regulators, V VPS is the voltage-positioning droop,
V DROP1 and V DROP2 are the parasitic voltage drops in
the discharge and charge paths (see the On-Time One-
Shot (TON) section), t OFF(MIN) is from the Electrical
Characteristics , and K is taken from Table 6. The
absolute minimum input voltage is calculated with h = 1.
If the calculated V IN(MIN) is greater than the required min-
imum input voltage, then reduce the operating frequency
or add output capacitance to obtain an acceptable V SAG .
If operation near dropout is anticipated, calculate V SAG to
be sure of adequate transient response.
L2
R SENSE
Dropout design example:
V FB = 1.4V
K MIN = 3μs for f SW = 300kHz
t OFF(MIN) = 400ns
V VPS = 3mV/A × 30A = 90mV
V DROP1 = V DROP2 = 150mV (30A load)
h = 1.5 and η OUTPH = 2
? 1 . 4 V - 90 mV + 150 mV ?
?
?
+ 150 mV - 150 mV + 90 mV = 4 . 96 V
Calculating again with h = 1 gives the absolute limit of
dropout:
? 1 . 4 V - 90 mV + 150 mV ?
?
?
+ 150 mV - 150 mV + 90 mV = 4 . 07 V
Therefore, V IN must be greater than 4.1V, even with very
large output capacitance, and a practical input voltage
with reasonable output capacitance would be 5V.
36
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1544ETL+ | 功能描述:电压模式 PWM 控制器 Dual-Phase Quick-PWM Controller 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 |
| MAX1544ETL+T | 功能描述:电压模式 PWM 控制器 Dual-Phase Quick-PWM Controller 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 |
| MAX1544ETL+TG075 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1544ETL-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 |
| MAX1544EVKIT | 制造商:Maxim Integrated Products 功能描述:DUAL-PHASE, QUICK-PWM CONTROLLER FOR AMD HAMM - Bulk |
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