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参数资料
| 型号： | MAX16903SATB50/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 5V 1A 10TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 3.5 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.1MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
MAX16903
2.1MHz, High-Voltage, 1A Mini-Buck Converter
operating frequency of 2.1MHz (typ). Spread spectrum is
offered to improve EMI performance of the MAX16903. By
Table 1. Nominal Output Voltage Values
varying the frequency 6% only in the positive direction,
the MAX16903 still guarantees that the 2.1MHz frequency
does not drop into the AM band limit of 1.8MHz.
Additionally, with the low minimum on-time of 80ns (typ)
no pulse skipping is observed for a 5V output with 18V
input maximum battery voltage in steady state.
The internal spread spectrum does not interfere with
the external clock applied on the SYNC pin. It is active
V OUT (V)
1.8 to 3.1
3.2 to 6.5
6.6 to 8.1
8.2 to 10
L NOM (μH)
V OUT /0.55
V OUT /0.96
V OUT /1.40
V OUT /1.75
only when the MAX16903 is running with internally gen-
erated switching frequency.
Table 2. Examples for Standard Output
Voltages
Power-Good (PGOOD)
The MAX16903 features an open-drain power-good
output. PGOOD is an active-high output that pulls low
when the output voltage is below 91% of its nominal
value. PGOOD is high impedance when the output volt-
age is above 93% of its nominal value. Connect a 20k Ω
(typ) pullup resistor to an external supply or the on-chip
BIAS output.
Overcurrent Protection
V OUT (V)
1.8
3.3
5.0
8.0
CALCULATED
L NOM (μH)
3.3
3.4
5.2
5.7
STANDARD
VALUE (μH)
3.3
3.3
4.7
5.6
Δ V ESR
Δ I P ? P ?
? ? I OUT +
C IN = OUT
The MAX16903 limits the peak output current to 1.5A
(typ). The accuracy of the current limit is ±15%, which
makes selection of external components very easy. To
protect against short-circuit events, the MAX16903 will
shut off when OUTS is below 1.5V (typ) and one over-
current event is detected. The MAX16903 attempts a
soft-start restart every 30ms and stays off if the short cir-
cuit has not been removed. When the current limit is no
longer present, it reaches the output voltage by follow-
ing the normal soft-start sequence. If the MAX16903 die
reaches the thermal limit of 175°C (typ) during the cur-
rent-limit event, it immediately shuts off.
Thermal-Overload Protection
The MAX16903 features thermal-overload protection.
The device turns off when the junction temperature
exceeds +175°C (typ). Once the device cools by 15°C
(typ), it turns back on with a soft-start sequence.
Applications Information
Inductor Selection
The nominal inductor value can be calculated using
Table 1 based on the nominal output voltage of the
device. Select the nearest standard inductance value to
the calculated nominal value. The nominal standard
value selected should be within ±25% of L NOM for best
performance.
Maxim Integrated
Input Capacitor
A low-ESR ceramic input capacitor of 1μF or larger is
needed for proper device operation. This value may
need to be larger based on application input-voltage
ripple requirements.
The discontinuous input current of the buck converter
causes large input ripple current. The switching frequen-
cy, peak inductor current, and the allowable peak-to-
peak input-voltage ripple dictate the input capacitance
requirement. Increasing the switching frequency or the
inductor value lowers the peak-to-average current ratio
yielding a lower input capacitance requirement.
The input ripple comprises mainly of Δ V Q (caused by
the capacitor discharge) and Δ V ESR (caused by the
ESR of the input capacitor). The total voltage ripple is
the sum of Δ V Q and Δ V ESR . Assume the input-voltage
ripple from the ESR and the capacitor discharge is
equal to 50% each. The following equations show the
ESR and capacitor requirement for a target voltage rip-
ple at the input:
ESR =
?
?
2 ?
I × D(1 ? D)
Δ V Q × f SW
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16903SAUE33/V+ | 功能描述:直流/直流开关转换器 2.1MHz Mini-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 |
| MAX16903SAUE33/V+T | 功能描述:直流/直流开关转换器 2.1MHz Mini-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 |
| MAX16903SAUE33+ | 制造商:Maxim Integrated Products 功能描述:2.1MHZ, HIGH-VOLTAGE, 1A MINI-BUCK CONVERTER - Rail/Tube |
| MAX16903SAUE50/V+ | 功能描述:直流/直流开关转换器 2.1MHz Mini-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 |
| MAX16903SAUE50/V+T | 功能描述:直流/直流开关转换器 2.1MHz Mini-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 |
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