- 您现在的位置：买卖IC网 > PDF目录16548 > MAX17409GTI+ (Maxim Integrated Products)IC CTRLR NVIDIA CPU 28-TQFN PDF资料下载
参数资料
| 型号： | MAX17409GTI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/32页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR NVIDIA CPU 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 系列： | Quick-PWM™ |
| 应用： | 处理器 |
| 电流 - 电源： | 1.5mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°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（4x4） |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页当前第26页第27页第28页第29页第30页第31页第32页
1-Phase Quick-PWM GPU Controller
capacitor selection, inductor saturation rating, and
the design of the current-limit circuit. The continu-
ous load current (I LOAD ) determines the thermal
stresses and thus drives the selection of input
capacitors, MOSFETs, and other critical heat-con-
output sag is also a function of the maximum duty fac-
tor, which can be calculated from the on-time and mini-
mum off-time. The worst-case output sag voltage can
be determined by:
(
) 2
? ? + t OFF (M IN ) ?
? ? V OUT t SW ? ?
? ?
? ? ( V IN OUT ) t SW ? ?
2 C OUT OUT ? ? ? - t OFF ( MIN ) ?
? ? ?
? ?
?
tributing components. Modern notebook CPUs gen-
erally exhibit I LOAD = I LOAD(MAX) x 80%.
Switching frequency: This choice determines the
basic trade-off between size and efficiency. The
optimal frequency is largely a function of maximum
input voltage, due to MOSFET switching losses that
V SAG =
L ? I LOAD(MAX) ? ? M
V
V IN ?
- V
V IN
are proportional to frequency and V IN 2 . The opti-
mum frequency is also a moving target, due to
rapid improvements in MOSFET technology that are
making higher frequencies more practical.
where t OFF(MIN) is the minimum off-time (see the
Electrical Characteristics table).
The amount of overshoot due to stored inductor energy
?
Inductor operating point: This choice provides
trade-offs between size vs. efficiency and transient
response vs. output noise. Low inductor values pro-
vide better transient response and smaller physical
can be calculated as:
V SOAR
≈
( ? I LOAD ( MAX ) ) 2 L
2 C OUT V OUT
size, but also result in lower efficiency and higher
output noise due to increased ripple current. The
? ? ? V OUT ?
V IN OUT
L = ?
? f SW LOAD ( MAX ) LIR ? ? V IN ?
V LIMIT = REF ILIM
minimum practical inductor value is one that causes
the circuit to operate at the edge of critical conduc-
tion (where the inductor current just touches zero
with every cycle at maximum load). Inductor values
lower than this grant no further size-reduction bene-
fit. The optimum operating point is usually found
between 20% and 50% ripple current.
Inductor Selection
The switching frequency and operating point (% ripple
current or LIR) determine the inductor value as follows:
- V
I ? ? ?
Find a low-loss inductor having the lowest possible DC
resistance that fits in the allotted dimensions. Ferrite
and molded iron cores are often the best choice,
although powdered iron is inexpensive and can work
well at 200kHz. The core must be large enough not to
saturate at the peak inductor current (I PEAK ):
Current-Limit Control (ILIM)
REF and ILIM are used to set the current limit. REF reg-
ulates to a fixed 2.0V and the REF-to-ILIM voltage
determines the valley current-sense threshold. When
ILIM = V CC , the controller uses the preset 22.5mV cur-
rent-limit threshold. In an adjustable design, ILIM is
connected to a resistive voltage-divider connected
between REF and ground. The differential voltage
between REF and ILIM sets the current-limit threshold
(V LIMIT ), so the valley current-sense threshold is:
V - V
10
This allows design flexibility since the DCR sense circuit
or sense resistor does not have to be adjusted to meet
the current limit as long as the current-sense voltage
never exceeds 50mV. Keeping V LIMIT between 20mV to
40mV leaves room for future current-limit adjustment.
The minimum current-limit threshold must be high
I PEAK LOAD ( MAX ) ? 1 +
= I
2 ?
?
?
LIR ?
?
enough to support the maximum load current when the
current limit is at the minimum tolerance value. The val-
ley of the inductor current occurs at I LOAD(MAX) minus
half the ripple current; therefore:
> I
I VALLEY LOAD ( MAX ) ? 1 -
2 ?
Transient Response
The inductor ripple current impacts transient-response
performance, especially at low V IN - V OUT differentials.
Low inductor values allow the inductor current to slew
faster, replenishing charge removed from the output fil-
ter capacitors by a sudden load step. The amount of
?
?
LIR ?
?
26
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX16920BATJ/V+T | IC PMIC MULT-OUTPUT AUTO 32TQFN |
| HMC05DREF-S13 | CONN EDGECARD 10POS .100 EXTEND |
| MAX1586CETM+T | IC POWER MANAGEMENT 48-TQFN |
| HSM06DSEF | CONN EDGECARD 12POS .156 EYELET |
| MAX1586BETM+T | IC POWER MANAGEMENT 48-TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17409GTI+ | 功能描述:电压模式 PWM 控制器 1-Phase Quick-PWM 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 |
| MAX17409GTI+T | 功能描述:电压模式 PWM 控制器 1-Phase Quick-PWM 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 |
| MAX1740EUB | 功能描述:转换 - 电压电平 Integrated Circuits (ICs) RoHS:否 制造商:Micrel 类型:CML/LVDS/LVPECL to LVCMOS/LVTTL 传播延迟时间:1.9 ns 电源电流:14 mA 电源电压-最大:3.6 V 电源电压-最小:3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MLF-8 |
| MAX1740EUB+ | 功能描述:转换 - 电压电平 SIM/Smart Card Level Translator RoHS:否 制造商:Micrel 类型:CML/LVDS/LVPECL to LVCMOS/LVTTL 传播延迟时间:1.9 ns 电源电流:14 mA 电源电压-最大:3.6 V 电源电压-最小:3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MLF-8 |
| MAX1740EUB+T | 功能描述:转换 - 电压电平 SIM/Smart Card Level Translator RoHS:否 制造商:Micrel 类型:CML/LVDS/LVPECL to LVCMOS/LVTTL 传播延迟时间:1.9 ns 电源电流:14 mA 电源电压-最大:3.6 V 电源电压-最小:3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MLF-8 |
发布紧急采购，3分钟左右您将得到回复。