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参数资料
| 型号： | MAX1876AEEG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 660kHz |
| 电源电压： | 4.5 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 ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
? SYNC Driven by External Oscillator: The controller
generates the clock signal by dividing down the
SYNC input signal, so that the switching frequency
equals half the synchronization frequency (f SW =
f SYNC /2). REG1’s conversion cycles initiate on the ris-
ing edge of the internal clock signal. The CKO output
frequency and phase match REG1’s switching fre-
quency (f CKO = f DH1 ) and the CKO signal is in
phase. Note that the MAX1858A/MAX1875A/
MAX1876A still require R OSC when SYNC is external-
Design Procedure
Effective Input Voltage Range
Although the MAX1858A/MAX1875A/MAX1876A con-
trollers can operate from input supplies ranging from
4.5V to 23V, the input voltage range can be effectively
limited by the MAX1858A/MAX1875A/MAX1876As ’
duty-cycle limitations. The maximum input voltage is
limited by the minimum on-time (t ON(MIN) ):
ly clocked and the internal oscillator frequency should
be set to 50% of the synchronization frequency (f SW
= 0.5 f SYNC ).
V IN ( MAX ) ≤
V OUT
t ON ( MIN ) f SW
V IN ( MIN ) = ? OUT DROP 1 ? + V DROP 2 - V DROP 1
Thermal Overload Protection
Thermal overload protection limits total power dissipation
in the MAX1858A/MAX1875A/MAX1876A. When the
device’s die-junction temperature exceeds T J = +160°C,
an on-chip thermal sensor shuts down the device, forcing
DL_ and DH_ low, allowing the IC to cool. The thermal
sensor turns the part on again after the junction tempera-
ture cools by 10°C. During thermal shutdown, the regula-
tors shut down, RST goes low, and soft-start is reset. If
the V L linear-regulator output is short circuited, thermal-
overload protection is triggered.
where t ON(MIN) is 100ns. The minimum input voltage is
limited by the switching frequency and minimum off-
time, which determine the maximum duty cycle
(D MAX = 1 - f SW t OFF(MIN) ):
? V + V ?
? ? 1- f SW t OFF ( MIN ) ? ?
where V DROP1 is the sum of the parasitic voltage drops
in the inductor discharge path, including synchronous
rectifier, inductor, and PC board resistances. V DROP2 is
the sum of the resistances in the charging path, includ-
ing high-side switch, inductor, and PC board resis-
tances.
MAX1858A
MAX1875A
MAX1876A
MAX1858A
MAX1875A
MAX1876A
MAX1858A
MAX1875A
MAX1876A
OSC
CK0
SYNC
OSC
CK0
SYNC
OSC
SYNC
V L
SYNC
V L
MASTER
3-OUTPUT APPLICATION
180 ° PHASE SHIFT
DH1
MASTER
DH2
SLAVE
MASTER
4-OUTPUT APPLICATION
90 ° PHASE SHIFT
DH1
MASTER
DH2
SLAVE
SLAVE
DH
SLAVE
DH1
DH2
Figure 7. Synchronized Controllers
14
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1876AEEG+ | 功能描述:电压模式 PWM 控制器 Dual 180 Out PWM Step-Down 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 |
| MAX1876AEEG+T | 功能描述:电压模式 PWM 控制器 Dual 180 Out PWM Step-Down 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 |
| MAX1876AEEG-T | 功能描述:DC/DC 开关控制器 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 |
| MAX1876EEG | 功能描述:DC/DC 开关控制器 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 |
| MAX1876EEG+ | 功能描述:电压模式 PWM 控制器 Dual 180 Out PWM Step-Down 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 |
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