- 您现在的位置：买卖IC网 > PDF目录1838 > MAX16976AEE/V+ (Maxim Integrated Products)IC REG BUCK 5V/ADJ 0.6A 16QSOP PDF资料下载
参数资料
| 型号： | MAX16976AEE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V/ADJ 0.6A 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，1 V ~ 10 V |
| 输入电压： | 3.5 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 220kHz ~ 1MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-QSOP |
MAX16976
28V, 600mA Automotive Step-Down Converter
with Low Operating Current
When using low-capacity filter capacitors, such as
ceramic capacitors, size is usually determined by the
capacity needed to prevent V SAG and V SOAR from caus-
ing problems during load transients. Generally, once
enough capacitance is added to meet the overshoot
requirement, undershoot at the rising load edge is no
longer a problem. However, low-capacity filter capacitors
typically have high-ESR zeros that can affect the overall
stability.
The basic regulator loop is modeled as a power modula-
tor, output feedback divider, and an error amplifier. The
power modulator has a DC gain set by g mc O R LOAD ,
with a pole and zero pair set by R LOAD , the output
capacitor (C OUT ), and its ESR. The following equations
allow to approximate the value for the gain of the power
modulator (GAIN MOD(dc) ), neglecting the effect of the
ramp stabilization. Ramp stabilization is necessary when
the duty cycle is above 50% and is internally done for
Rectifier Selection
The device requires an external Schottky diode rectifier
as a freewheeling diode. Connect this rectifier close to the
device using short leads and short PCB traces. Choose
the device.
GAIN MOD(dc) = g mc ×
R LOAD × f SW × L
R LOAD + (f SW × L)
a rectifier with a continuous current rating higher than
the highest output current-limit threshold (1.25A) and
with a voltage rating higher than the maximum expected
input voltage, V SUPSW . Use a low forward-voltage-drop
Schottky rectifier to limit the negative voltage at LX. Avoid
higher than necessary reverse-voltage Schottky rectifiers
that have higher forward-voltage drops.
where R LOAD = V OUT /I LOUT(MAX) in I , f SW is the switch-
ing frequency in MHz, L is the output inductance in F H,
and g mc = 3S.
In a current-mode step-down converter, the output
capacitor, its ESR, and the load resistance introduce a
pole at the following frequency:
? R LOAD × f SW × L
? R LOAD SW × L)
2 π × C OUT × ?
+ ESR ?
Compensation Network
The device uses an internal transconductance error
amplifier with its inverting input and its output available for
external frequency compensation. The output capacitor
f pMOD =
1
+ (f
?
?
f zMOD =
and compensation network determine the loop stability.
The inductor and the output capacitor are chosen based
on performance, size, and cost. Additionally, the compen-
sation network optimizes the control-loop stability.
The controller uses a current-mode control scheme that
regulates the output voltage by forcing the required cur-
rent through the external inductor, so the device uses
the voltage drop across the high-side MOSFET. Current-
mode control eliminates the double pole in the feedback
loop caused by the inductor and output capacitor result-
ing in a smaller phase shift and requiring less elaborate
error-amplifier compensation than voltage-mode control.
A simple single series resistor (R C ) and capacitor (C C )
are all that is required to have a stable, high-bandwidth
loop in applications where ceramic capacitors are used
The output capacitor and its ESR also introduce a zero at:
1
2 π × ESR × C OUT
When C OUT is composed of “n” identical capacitors in
parallel, the resulting C OUT = n O C OUT(EACH) and ESR
= ESR (EACH) /n. Note that the capacitor zero for a paral-
lel combination of alike capacitors is the same as for an
individual capacitor.
V OUT
R1
for output filtering ( Figure 2 ). For other types of capaci-
tors, due to the higher capacitance and ESR, the fre-
quency of the zero created by the capacitance and
ESR is lower than the desired closed-loop crossover fre-
R2
V REF
g m
R C
COMP
C F
quency. To stabilize a nonceramic output capacitor loop,
C C
add another compensation capacitor (C F ) from COMP to
GND to cancel this ESR zero.
Figure 2. Compensation Network
???????????????????????????????????????????????????????????????? Maxim Integrated Products 14
相关PDF资料 |
PDF描述 |
|---|---|
| MAX16977SAUE/V+ | IC BUCK SYNC ADJ 2A 16TSSOP |
| MAX1697REUT#TG16 | IC REG SWITCHED CAP INV SOT23-6 |
| MAX16998DAUA/V+ | IC TIMER WATCHDOG 8UMAX |
| MAX16999AUA33+ | IC REG LDO 3.3V .1A 8UMAX-EP |
| MAX17000AETG+T | IC PWM CTLR DDR/DDR2/DDR3 24TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16977EVKIT# | 功能描述:直流/直流开关转换器 36V 2A 2.2MHz Step-Down Converter with Low Operating Current RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX16977RATE/V+ | 功能描述:直流/直流开关转换器 36V 2A 2.2MHz Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX16977RATE/V+T | 功能描述:直流/直流开关转换器 36V 2A 2.2MHz Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX16977RATE+ | 制造商:Maxim Integrated Products 功能描述:36V, 2A, 2.2MHZ STEP-DOWN CONVERTER WITH LOW OPERATING CURRE - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC REG BUCK SYNC 5V/ADJ 16TQFN 制造商:Maxim Integrated Products 功能描述:Voltage Regulators - Switching Regulators 36V 2.2MHz SD Cnvtr 2A w/ Low Op Crnt |
| MAX16977RATE+T | 制造商:Maxim Integrated Products 功能描述:36V, 2A, 2.2MHZ STEP-DOWN CONVERTER WITH LOW OPERATING CURRE - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC REG BUCK SYNC 5V/ADJ 16TQFN |
发布紧急采购，3分钟左右您将得到回复。