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参数资料
| 型号： | MAX8794ETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC DDR LINEAR REG 10-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR |
| 输入电压： | 1.1 V ~ 3.6 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 1.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
Low-Voltage DDR Linear Regulator
The MAX8794 features an open-drain PGOOD output
that transitions high 2ms after the output initially reach-
es regulation. PGOOD goes low within 10μs of when
the output goes out of regulation by ± 150mV. The
MAX8794 features current- and thermal-limiting circuitry
to prevent damage during fault conditions.
3.3V Bias Supply (V CC )
The V CC input powers the control circuitry and provides
the gate drive to the pass transistor. This improves effi-
ciency by allowing V IN to be powered from a lower sup-
ply voltage. Power V CC from a well-regulated 3.3V
supply. Current drawn from the V CC supply remains rel-
atively constant with variations in V IN and load current.
Bypass V CC with a 1μF or greater ceramic capacitor as
close to the device as possible.
V CC Undervoltage Lockout (UVLO)
The V CC input UVLO circuitry ensures that the regulator
starts up with adequate voltage for the gate-drive cir-
cuitry to bias the internal pass transistor. The UVLO
threshold is 2.55V (typ). V CC must remain above this
level for proper operation.
Power-Supply Input (IN)
IN provides the source current for the linear regulator’s
connected to ceramic bypass capacitors (0.33μF to
1.0μF). REFOUT is active when V REFIN > 0.45V and
V CC is above V UVLO . REFOUT is independent of SHDN .
Shutdown
Drive SHDN low to disable the error amplifier, gate-
drive circuitry, and pass transistor (Figure 2). In shut-
down, OUT is terminated to AGND with an 8 Ω MOSFET.
REFOUT is independent of SHDN . Connect SHDN to
V CC for normal operation.
Current Limit
The MAX8794 features source and sink current limits to
protect the internal n-channel MOSFETs. The source-
and-sink MOSFETs have a typical 3A current limit (1.8A
min). This current limit prevents damage to the internal
power transistors, but the device can enter thermal
shutdown if the power dissipation increases the die
temperature above +165 ° C (see the Thermal-Overload
Protection section).
Soft-Start Current Limit
Soft-start gradually increases the internal source current
limit to reduce input surge currents at startup. Full-
source current limit is available after the 200μs soft-start
timer has expired. The soft-start current limit is given by:
I LIMIT ( SS ) = LIMIT
output, OUT. IN connects to the drain of the internal
n-channel power MOSFET. IN can be as low as 1.1V,
minimizing power dissipation. The input UVLO prohibits
I
t SS
× t
operation below 0.9V (typ). Bypass IN with a 10μF or
greater capacitor as close to the device as possible.
Reference Input (REFIN)
The MAX8794 regulates OUTS to the voltage set at
REFIN, making the MAX8794 ideal for memory applica-
tions where the termination supply must track the sup-
ply voltage. Typically, REFIN is set by an external
resistive voltage-divider connected to the memory sup-
ply (V DDQ ) as shown in Figure 1.
The maximum output voltage of 1.5V is limited by the
gate-drive voltage of the internal n-channel power
transistor.
Buffered Reference Output (REFOUT)
REFOUT is a unity-gain transconductance amplifier that
generates the DDR reference supply. It sources and
sinks greater than 5mA. The reference buffer is typically
where I LIMIT and t SS are from the Electrical Charac-
teristics. Figure 3 shows the MAX8794 PGOOD and
soft-start waveform.
Thermal-Overload Protection
Thermal-overload protection prevents the linear regulator
from overheating. When the junction temperature
exceeds +165°C, the linear regulator and reference
buffer are disabled, allowing the device to cool. Normal
operation resumes once the junction temperature cools
by 15 ° C. Continuous short-circuit conditions result in a
pulsed output until the overload is removed. A continuous
thermal-overload condition results in a pulsed output. For
continuous operation, do not exceed the absolute maxi-
mum junction-temperature rating of +150°C.
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