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参数资料
| 型号： | MAX1544ETL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/42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
Table 3. Operating Mode Truth Table
SHDN
SUS
SKIP
OFS
OUTPUT
VOLTAGE
OPERATING MODE
Low-Power Shutdown Mode. DL_ is forced high, DH_ is
GND
x
x
x
GND
forced low, and the PWM controller is disabled. The supply
current drops to 1μA (typ).
V CC
V CC
V CC
V CC
GND
x
GND
REF
or
High
V CC
GND
or
REF
x
x
GND or REF
GND or REF
0 to 0.8V
or
1.2V to 2V
x
D0 – D4
(No offset)
D0 – D4
(No offset)
D0 – D4
(Plus offset)
SUS, S0 – S1
(No offset)
Normal Operation. The no-load output voltage is determined by
the selected VID DAC code (D0 – D4, Table 4).
Pulse-Skipping Operation. When SKIP is pulled low, the
MAX1544 immediately enters pulse-skipping operation
allowing automatic PWM/PFM switchover under light loads.
The VROK upper threshold is blanked.
Deep-Sleep Mode. The no-load output voltage is determined
by the selected VID DAC code (D0 – D4, Table 4) plus the
offset voltage set by OFS.
Suspend Mode. The no-load output voltage is determined by
the selected suspend code (SUS, S0 – S1, Table 5),
overriding all other active modes of operation.
Fault Mode. The fault latch has been set by either UVP, OVP,
V CC
x
x
x
GND
or thermal shutdown. The controller remains in FAULT mode
until V CC power is cycled or SHDN toggled.
This eliminates the need for the Schottky diode normally
connected between the output and ground to clamp the
negative output voltage excursion. When the DAC
reaches the 0V setting, DL_ goes high, DH_ goes low,
the reference turns off, and the supply current drops to
about 1μA. When a fault condition — output undervoltage
lockout, output overvoltage lockout (OVP = V CC ), or ther-
mal shutdown — activates the shutdown sequence, the
controller sets the fault latch to prevent the controller from
restarting. To clear the fault latch and reactivate the con-
troller, toggle SHDN or cycle V CC power below 1V.
When SHDN goes high, the reference powers up. Once
the reference voltage exceeds its UVLO threshold, the
controller evaluates the DAC target and starts switching.
The slew-rate controller ramps up from 0V in LSB
increments to the currently selected output-voltage set-
ting (see the Power-Up Sequence section). There is no
traditional soft-start (variable current-limit) circuitry, so
full output current is available immediately.
Internal Multiplexers
The MAX1544 has a unique internal DAC input
multiplexer (muxes) that selects one of three different
DAC code settings for different processor states
(Figure 3). On startup, the MAX1544 selects the DAC
code from the D0 – D4 (SUS = GND) or S0 – S1 (SUS = REF
or high) input decoders.
DAC Inputs (D0–D4)
During normal forced-PWM operation (SUS = GND), the
digital-to-analog converter (DAC) programs the output
voltage using the D0 – D4 inputs. Do not leave D0 – D4
unconnected. D0 – D4 can be changed while the
MAX1544 is active, initiating a transition to a new output
voltage level. Change D0 – D4 together, avoiding
greater than 1μs skew between bits. Otherwise, incor-
rect DAC readings can cause a partial transition to the
wrong voltage level followed by the intended transition
to the correct voltage level, lengthening the overall tran-
sition time. The available DAC codes and resulting out-
put voltages are compatible with AMD Hammer voltage
specifications (Table 4).
Four-Level Logic Inputs
TON and S0 – S1 are four-level logic inputs. These
inputs help expand the functionality of the controller
without adding an excessive number of pins. The four-
level inputs are intended to be static inputs. When left
open, an internal resistive voltage-divider sets the input
voltage to approximately 3.5V. Therefore, connect the
four-level logic inputs directly to V CC , REF, or GND
when selecting one of the other logic levels. See the
Electrical Characteristics for exact logic level voltages.
20
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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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