- 您现在的位置：买卖IC网 > PDF目录13573 > MAX8649AEWE+T (Maxim Integrated Products)IC REG BUCK SYNC ADJ 1.8A 16WLP PDF资料下载
参数资料
| 型号： | MAX8649AEWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/31页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.8A 16WLP |
| 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： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 1.38 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 频率 - 开关： | 3.25MHz |
| 电流 - 输出： | 1.8A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-UFBGA，WLCSP |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-WLP（2x2） |
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页当前第15页第16页第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页第30页第31页
1.8A Step-Down Regulator with
Remote Sense in 2mm x 2mm WLP
Soft-Start
The ICs include internal soft-start circuitry that eliminates
inrush current at startup, reducing transients on the
input source (see the Typical Operating Charac-
teristics). Soft-start is particularly useful for high-imped-
ance input sources, such as Li+ and alkaline cells.
When enabling the ICs into a prebiased output, the ICs
perform a complete soft-start cycle.
Synchronous Rectification
An internal n-channel synchronous rectifier eliminates
the need for an external Schottky diode and improves
efficiency. The synchronous rectifier turns on during the
second half of each switching cycle (off-time). During
this time, the voltage across the inductor is reversed,
mode. When the regulator is set for power-save mode
and the RAMP_DOWN bit is cleared, the ramp-down is
not actively controlled, and the regulator output voltage
ramps down at the rate determined by the output
capacitance and the external load. Small loads result in
an output-voltage decay that is slower than that speci-
fied by RAMP; large loads result in an output-voltage
decay that is no faster than that specified by RAMP
When the RAMP_DOWN bit is set in power-save mode,
the zero-cross comparator is disabled during the ramp-
down condition. Active ramp-down functionality is
inherent in forced-PWM operation.
Calculate the maximum and minimum values for the
ramp rate as follows:
t RAMP _ MIN = ×
t CLK _ MAX
2
t RAMP _ MAX = ×
t CLK _ MIN
2
t CLK _ MAX =
t CLK _ MIN =
and the inductor current ramps down. In PWM mode,
the synchronous rectifier turns off at the end of the
switching cycle. In power-save mode, the synchronous
rectifier turns off when the inductor current falls below
50mA (typ) or at the end of the switching cycle,
whichever occurs first.
Ramp-Rate Control
The output voltage has an actively controlled variable
ramp rate, set with the I 2 C interface (see Figures 6, 7,
and 8). The value set in the RAMP register controls the
output voltage ramp rate. The RAMP_DOWN bit con-
trols the active ramp-down behavior in power-save
OUTPUT
where:
V OUT _ LSB 1
RAMP _ CODE
V OUT _ LSB 1
RAMP _ CODE
V OUT _ LSB = 10 mV
1
f SW _ MIN
1
f SW _ MAX
VOLTAGE
f SW = 3.25MHz ±10% for PWM operation
f SW = SYNC
V OUT '
DELTA V = 10mV
f SW = 3.25MHz ±25% for hysteretic operation
f
n
V OUT
10mV/RAMP RATE
TIME
f SYNC = frequency of external clock
n = 4 for 13MHz, 6 for 19.2MHz, and 8 for 26MHz
RAMP_CODE = value of the RAMP[2:0] register (see
Table 9)
Figure 6. Ramp-Up Function
FINAL
OUTPUT
VOLTAGE
V OUT
DELTA
OUTPUT
VOLTAGE
V OUT '
V = 10mV
10mV/RAMP
RATE
TIME
MODE CHANGE
TO HIGHER VOUT
MODE CHANGE
TO LOWER VOUT
Figure 7. Ramp-Down Function
Figure 8. Mode Change Before Final Value is Reached
______________________________________________________________________________________
15
相关PDF资料 |
PDF描述 |
|---|---|
| MAX6828LUT+T | IC MPU SUPERVISOR SOT23-6 |
| MAX8649EWE+T | IC REG BUCK SYNC ADJ 1.8A 16WLP |
| MAX6826LUT+T | IC MPU SUPERVISOR SOT23-6 |
| MAX1595ETC33+T | IC REG MULTI CONFIG 3.3V 12TQFN |
| SC1608C-102 | INDUCTOR SMD 1000UH .045A 100KHZ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8649BEWE+T | 功能描述:直流/直流开关调节器 1.8A Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX8649EVKIT+ | 制造商:Maxim Integrated Products 功能描述:1.8A STEP-DOWN REGULATOR W/DIFFERENTIAL REMOTE SENSE IN 2MM - Boxed Product (Development Kits) |
| MAX8649EWE+ | 制造商:Maxim Integrated Products 功能描述:1.8A STEP-DOWN REGULATOR W/DIFFEREN - Rail/Tube |
| MAX8649EWE+T | 功能描述:直流/直流开关调节器 1.8A Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX8649SEWE+T | 功能描述:直流/直流开关调节器 1.8A Step-Down Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
发布紧急采购，3分钟左右您将得到回复。