参数资料
| 型号： | MAX1515ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG DDR LV 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 应用： | 转换器，DDR |
| 输入电压： | 1.3 V ~ 3.6 V |
| 输出数： | 2 |
| 输出电压： | 0.5 V ~ 2.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 管件 |
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
MAXIMUM RECOMMENDED OPERATING
FREQUENCY vs. INPUT VOLTAGE
Table 5. Recommended Component
Values (I OUT = 3A)
1000
800
600
V OUT = 1.8V
V IN
(V)
3.3
3.3
3.3
V OUT
(V)
2.5
1.8
1.5
f PWM
(kHz)
400
400
480
L
(μH)
1.5
2.2
2.2
C OUT
(μF)
100
150
180
R TOFF
(k Ω )
49.9
110
110
400
200
V OUT = 1.5V
V OUT = 1.25V
V OUT = 0.9V
V OUT = 2.5V
3.3
2.5
2.5
2.5
1.2
1.8
1.5
1.2
420
430
320
440
2.2
1.2
1.8
1.5
220
100
150
180
150
49.9
110
110
0
1.5
2.0
2.5
3.0
NO LOAD
3.5
Use the following equation to select the off-time
V IN (V)
Figure 6. Maximum Operating Frequency vs. Input Voltage
according to the desired no-load switching frequency
in PWM mode:
where:
t OFF =
V IN ? V OUT
f PWM × V IN
C = 5nF
f SW = switching frequency
The combined conduction losses (PCL) in the two
power switches are approximated by:
PCL = I OUT 2 x R NMOS
where:
I OUT = load current
where:
t OFF = the programmed off-time
V IN = the input voltage
V OUT = the output voltage
f PWM = no-load switching frequency, PWM mode
Select R TOFF according to the formula:
R NMOS = NMOS switch on-resistance
Design Procedure
R TOFF = ( t OFF ? 0 . 035 μ s )
110k Ω
1 . 00 μ s
For typical DDR applications, use the recommended
component values in Table 1. For other applications,
use the recommended component values in Table 5, or
take the following steps:
1) Select the desired PWM-mode switching frequency.
See Figure 6 for maximum operating frequency.
2) Select the constant off-time as a function of input
voltage, output voltage, and switching frequency.
V RTOFF is typically 1.1V and the recommended values
for R TOFF range from 33.2k Ω to 499k Ω for off-times of
0.35μs to 4.5μs.
Frequency Variation with Output Current
The operating frequency of the MAX1515 in PWM mode
is determined primarily by t OFF (set by R TOFF ), V IN , and
V OUT as shown in the following formula:
3) Select R TOFF as a function of off-time.
4) Select the inductor as a function of output voltage,
off-time, and peak-to-peak inductor current.
f PWM =
V IN ? V OUT ? V CHG
t OFF ( V IN ? V CHG + V DISCHG )
Programming the No-Load Switching
Frequency and Off-Time
The MAX1515 features a programmable PWM mode
switching frequency, which is set by the input and out-
put voltage and the value of R TOFF . R TOFF sets the
high-side NMOS power switch off-time in PWM mode.
where:
V CHG = the voltage drop in the inductor charge path
due to high-side FET R NMOS and inductor DCR
V DISCHG = the voltage drop in the inductor discharge
path due to low-side FET R NMOS and inductor DCR
18
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| MAX1515ETG+ | 功能描述:直流/直流开关调节器 3A 1MHz Step-Down DDR 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 |
| MAX1515ETG+T | 功能描述:直流/直流开关调节器 3A 1MHz Step-Down DDR 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 |
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