- 您现在的位置：买卖IC网 > PDF目录14390 > MAX5098AATJ+ (Maxim Integrated Products)IC REG BUCK BST ADJ 1A/2A 32TQFN PDF资料下载
参数资料
| 型号： | MAX5098AATJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 1A/2A 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 0.85 V，4.5 V ~ 28 V |
| 输入电压： | 4.5 V ~ 19 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 2.2MHz |
| 电流 - 输出： | 1A，2A |
| 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： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
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页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
Dual, 2.2MHz, Automotive Buck or Boost
Converter with 80V Load-Dump Protection
Applications Information
Setting the Switching Frequency
The controller generates the clock signal by dividing
down the internal oscillator f OSC or the SYNC input sig-
nal when driven by an external oscillator. The switching
frequency equals half the internal oscillator frequency
(f SW = f OSC /2). The internal oscillator frequency is set
by a resistor (R OSC ) connected from OSC to SGND. To
find R OSC for each converter switching frequency f SW ,
use the formulas:
of the inductor, and the PCB resistance. V DROP2 is the
total resistance in the charging path that includes the
on-resistance of the high-side switch, the series resis-
tance of the inductor, and the PCB resistance.
Setting the Output Voltage
For 0.8V or greater output voltages, connect a voltage-
divider from OUT_ to FB_ to SGND (Figure 3). Select R B
(FB_ to SGND resistor) to between 1k Ω and 20k Ω .
Calculate R A (OUT_ to FB_ resistor) with the following
equation:
(
0 . 920 SW
f SW ( MHz )
R A = R B ? ?
? ? 1 ?
R OSC ( k Ω ) =
10 . 721
f
≥ 1 . 25 MHz
)
? ? V OUT _ ? ?
? ?
? ? V FB _ ? ?
(
0 . 973 SW
f SW ( MHz )
R OSC ( k Ω ) =
12 . 184
f
< 1 . 25 MHz
)
where V FB_ = 0.8V (see the Electrical Characteristics
table) and V OUT_ can range from V FB_ to 28V (boost
operation).
? V FB _ ? V OUT _ ?
A rising clock edge on SYNC is interpreted as a syn-
chronization input. If the SYNC signal is lost, the inter-
nal oscillator takes control of the switching rate,
returning the switching frequency to that set by R OSC .
When an external synchronization signal is used, R OSC
must be selected such that f SW = 1/2 f SYNC . When
f SYNC clock signal is applied, f CKO equals f SYNC wave-
form, phase shifted by 180°. If the MAX5098A is run-
ning without external synchronization, f CKO equals the
internal oscillator frequency f OSC .
Buck Converter
Effective Input Voltage Range
Although the MAX5098A converter can operate from
input supplies ranging from 5.2V to 19V, the input volt-
age range can be effectively limited by the MAX5098A
duty-cycle limitations for a given output voltage. The
For output voltages below 0.8V, set the MAX5098A out-
put voltage by connecting a voltage-divider from OUT_
to FB_ to BYPASS (Figure 3). Select R C (FB_ to BYPASS
resistor) in the 50k Ω range. Calculate R A with the fol-
lowing equation:
R A = R C ? ?
? ? V BYPASS ? V FB _ ? ?
where V FB_ = 0.8V, V BYPASS = 2V (see the Electrical
Characteristics table), and V OUT_ can range from 0V to
V FB_ .
V OUT_
maximum input voltage is limited by the minimum on-
time (t ON(MIN) ):
SOURCE_
BYPASS
V IN ( MAX ) ≤
V OUT
t ON ( MIN ) × f SW
FB_
R A
FB_
R C
V IN ( MIN ) = ? OUT DROP 1 ? + V DROP 2 ? V DROP 1
where t ON(MIN) is 100ns. The minimum input voltage is
limited by the maximum duty cycle (D MAX = 0.82):
? V + V ?
? D MAX ?
MAX5098A
V OUT_ ≥ 0.8V
R B
MAX5098A
SOURCE_
V OUT_ < 0.8V
R A
V OUT_
where V DROP1 is the total parasitic voltage drops in the
inductor discharge path, which includes the forward
voltage drop (V D ) of the rectifier, the series resistance
Figure 3. Adjustable Output Voltage
18
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| RBM36DRUS | CONN EDGECARD 72POS DIP .156 SLD |
| VI-B5V-EX-F4 | CONVERTER MOD DC/DC 5.8V 75W |
| ECC35DRSD-S273 | CONN EDGECARD 70POS DIP .100 SLD |
| MAX5099ATJ+ | IC REG BUCK SYNC ADJ DL 32TQFN |
| EMM15DTMT-S189 | CONN EDGECARD 30POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5098AATJ+ | 功能描述:直流/直流开关转换器 Dual 2.2MHz Buck or Boost 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 |
| MAX5098AATJ+T | 功能描述:直流/直流开关转换器 Dual 2.2MHz Buck or Boost 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 |
| MAX5099 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection |
| MAX5099ATJ | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection |
| MAX5099ATJ+ | 功能描述:直流/直流开关转换器 Dual 2.2MHz Synch Buck 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 |
发布紧急采购，3分钟左右您将得到回复。