- 您现在的位置：买卖IC网 > PDF目录1836 > MAX15002ATL+T (Maxim Integrated Products)IC REG CTRLR BUCK PWM 40-TQFNEP PDF资料下载
参数资料
| 型号： | MAX15002ATL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 40-TQFNEP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 2.2MHz |
| 电源电压： | 5.5 V ~ 23 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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页当前第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页第26页第27页第28页第29页
MAX15002
Dual-Output Buck Controller with
Tracking/Sequencing
? I P ? P
8 × ? V Q SW
× f
2 × ? V ESR
? I P ? P
Input Capacitor Selection
The discontinuous input current of the buck converter
causes large input ripple currents and therefore the
input capacitor must be carefully chosen to withstand
the input ripple current and keep the input voltage rip-
ple within design requirements. The 180° ripple phase
operation increases the frequency of the input capaci-
tor ripple current to twice the individual converter
switching frequency. When using ripple phasing, the
worst-case input capacitor ripple current is when the
one converter with the highest output current is on.
The input voltage ripple is comprised of ? V Q (caused by
the capacitor discharge) and ? V ESR (caused by the ESR
of the input capacitor). The total voltage ripple is the sum
of ? V Q and ? V ESR that peaks at the end of the on-cycle.
Calculate the input capacitance and ESR required for a
specified ripple using the following equations:
output ripple is mainly composed of ? V Q (caused by
the capacitor discharge) and ? V ESR (caused by the
voltage drop across the equivalent series resistance of
the output capacitor). The equations for calculating the
output capacitance and its ESR are:
C OUT =
E SR =
? V ESR and ? V Q are not directly additive because they
are out of phase from each other. If using ceramic
capacitors, which generally have low ESR, ? V Q domi-
nates. If using electrolytic capacitors, ? V ESR dominates.
The allowable deviation of the output voltage during
? I LOAD ( MAX ) +
? I P ? P ?
?
?
E SR =
?
?
? V ESR
2
fast load transients also affects the output capacitance,
its ESR, and its equivalent series inductance (ESL). The
output capacitor supplies the load current during a
load step until the controller responds with a greater
I LOAD ( MAX ) × ? OUT ?
CIN =
? V Q × f SW
? V ?
? V IN ?
duty cycle. The response time (t RESPONSE ) depends on
the gain bandwidth of the converter (see the
Compensation Design Guidelines section). The resis-
tive drop across the output capacitor’s ESR, the drop
( V IN ? V OUT ) × V OUT
? I P ? P =
where:
V IN × f SW × L
I LOAD(MAX) is the maximum output current, ? I P-P is the
peak-to-peak inductor current, and f SW is the switching
frequency.
For the condition with only one converter on, calculate
the input ripple current using the following equation:
across the capacitor ’s ESL, and the capacitor dis-
charge cause a voltage droop during the load-step
(I STEP ). Use a combination of low-ESR tantalum/alu-
minum electrolyte and ceramic capacitors for better
load-transient and voltage-ripple performance.
Nonleaded capacitors and capacitors in parallel help
reduce the ESL. Keep the maximum output voltage
deviation below the tolerable limits of the electronics
being powered.
Use the following equations to calculate the required
ESR, ESL, and capacitance value during a load step:
I CIN ( RMS ) = ILOAD _ MAX ×
V OUT × ( V IN ? V OUT )
V IN
E SR =
? V ESR
I STEP
The MAX15002 includes UVLO hysteresis to avoid pos-
sible unintentional chattering during turn-on. Use addi-
C OUT =
I STEP × t RESPONSE
? V Q
tional bulk capacitance if the input source impedance is
high. At lower input voltage, additional input capaci-
tance helps avoid possible undershoot below the under-
E SL =
? V ESL × t STEP
I STEP
voltage lockout threshold during transient loading.
Output Capacitor Selection
The allowed output voltage ripple and the maximum
deviation of the output voltage during load steps deter-
mine the required output capacitance and its ESR. The
Maxim Integrated
where I STEP is the load step, t STEP is the rise time of the
load step, and t RESPONSE is the response time of the
controller.
17
相关PDF资料 |
PDF描述 |
|---|---|
| MAX15003ATM+T | IC REG CTRLR BUCK PWM 48TQFN-EP |
| MAX15005AAUE/V+ | IC REG CTRLR PWM CM 16-TSSOP |
| MAX15006BASA+ | IC REG LDO 5V 50MA 8-SOIC |
| MAX15008ATJ+ | IC REG LDO 5V/ADJ .3A 32TQFN-EP |
| MAX15009ATJ+ | IC REG LDO 5V/ADJ .3A 32TQFN-EP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15003ATM+ | 功能描述:DC/DC 开关控制器 Triple-Out Buck Ctlr w/Track/Sequence RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15003ATM+T | 功能描述:DC/DC 开关控制器 Triple-Out Buck Ctlr w/Track/Sequence RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15003EVKIT+ | 功能描述:电源管理IC开发工具 MAX15003 Eval Kit 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 |
| MAX15004AAUE/V+ | 功能描述:电流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX15004AAUE/V+T | 功能描述:电流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
发布紧急采购，3分钟左右您将得到回复。