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| 型号： | MAX8632ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY DDR 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，DDR |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 1.8V，2.5V，0.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
Overvoltage Protection (OVP)
When the output voltage rises above 116% of the nomi-
nal regulation voltage and OVP is enabled (OVP/UVP =
AV DD or open), the OVP circuit sets the fault latch,
shuts down the PWM controller, and immediately pulls
DH low and forces DL high. This turns on the synchro-
nous-rectifier MOSFET (Q2 in Figure 8) with a 100%
duty cycle, rapidly discharging the output capacitor
and clamping the output to ground. Once the output
reaches 0.1V, DL is switched off, preventing the possi-
bility of a negative voltage on the output. Toggle SHDN
or cycle AV DD below 1V to clear the fault latch and
restart the controller. OVP is disabled when OVP/UVP is
connected to REF or GND (see Table 3). OVP only
applies to the buck output. The VTT and VTTR outputs
do not have overvoltage protection.
Undervoltage Protection (UVP)
When the output voltage drops below 70% of its regula-
tion voltage while UVP is enabled, the controller sets
the fault latch and begins the discharge mode (see the
SHDN and Output Discharge section). UVP is ignored
for at least 10ms (min) after startup or after a rising
edge on SHDN . Toggle SHDN or cycle AV DD power
below 1V to clear the fault latch and restart the con-
troller. UVP is disabled when OVP/UVP is left open or
connected to GND (see Table 3). UVP only applies to
the buck output. The VTT and VTTR outputs do not
have undervoltage protection.
Thermal Fault Protection
The MAX8632 features two thermal-fault-protection cir-
cuits. One monitors the buck-regulator portion of the IC
and the other monitors the linear regulator (VTT) and
the reference buffer output (VTTR). When the junction
Table 3. OVP/UVP Fault Protection
temperature of the buck-regulator portion of the
MAX8632 rises above +160°C, a thermal sensor acti-
vates the fault latch, pulls POK1 low, and shuts down
the buck-controller output using discharge mode
regardless of the OVP/UVP setting. Toggle SHDN or
cycle AV DD below 1V to reactivate the controller after
the junction temperature cools by 15°C. If the VTT and
VTTR regulator portion of the IC has its die temperature
rise above +160 ° C, then VTT and VTTR shut off, go
high impedance, and restart after the die portion of the
IC cools by 15 ° C. Both thermal faults are independent.
For example, if the VTT output is overloaded to the
point that it triggers its thermal fault, the buck regulator
continues to function.
Design Procedure
Firmly establish the input voltage range (V IN ) and maxi-
mum load current (I LOAD ) in the buck regulator before
choosing a switching frequency and inductor operating
point (ripple current ratio or LIR). The primary design
trade-off lies in choosing a good switching frequency
and inductor operating point, and the following four fac-
tors dictate the rest of the design:
? Input Voltage Range. The maximum value (V IN(MAX) )
must accommodate the worst-case voltage. The mini-
mum value (V IN(MIN) ) must account for the lowest
voltage after drops due to connectors and fuses. If
there is a choice, lower input voltages result in better
efficiency.
? Maximum Load Current. There are two values to con-
sider. The peak load current (I PEAK ) determines the
instantaneous component stresses and filtering
requirements and thus drives output capacitor selec-
tion, inductor saturation rating, and the design of the
OVP/UVP
DISCHARGE
UVP PROTECTION
OVP PROTECTION
Yes.
AV DD
Output is discharged through an
Enabled
Enabled
internal 10 ? resistance.
Yes.
OPEN
Output is discharged through an
Disabled
Enabled
internal 10 ? resistance.
REF
GND
No.
DL forced low when SHDN is low.
No.
DL forced low when SHDN is low.
Enabled
Disabled
Disabled
Disabled
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8632EVKIT | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8633ELA+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX8633ELA+T | 功能描述:低压差稳压器 - LDO Dual 300mA Pin-Prog LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8633ETA+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.5V TO 3V 0.3A 8TDFN EP - Rail/Tube |
| MAX8633ETA+T | 功能描述:低压差稳压器 - LDO Dual 300mA Pin-Prog LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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