参数资料
| 型号： | MAX1515ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/24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： | 2,500 |
| 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： | 带卷 (TR) |
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
Pin Description (continued)
PIN
18
19
20
21, 22
23, 24
NAME
FBSEL1
SKIP
BST
LX
IN
FUNCTION
Used with FBSEL0 to set the output voltage of the step-down regulator when MODE = GND.
Connect to GND if MODE = V CC .
Pulse-Skipping Control Input. Connect to V CC for low-noise, forced-PWM mode. Connect to GND to
enable automatic pulse-skipping operation.
Boost Flying-Capacitor Connection. Connect an external 0.01μF capacitor as shown in the standard
application circuit (Figure 1).
Inductor Switched Node. LX is the connection for the source of the high-side NMOS power switch
and drain of the low-side NMOS synchronous-rectifier switch. Connect both LX pins together.
Power Input. Supply voltage input for the switching regulator. Connect to a +1.3V to +3.6V supply
voltage. Connect both IN pins together.
Table 1. Component Selection for Standard Applications
COMPONENT
Input Voltage (V IN )
Output Voltage (V OUT )
C IN , Input Capacitor
±2A AT 1.25V OUT
DDR MODE (MODE = V CC )
2.3V to 2.7V
1.25V
33μF, 6.3V, ceramic
TDK C3225XR0J336V
±2A AT 0.9V OUT
DDR MODE (MODE = V CC )
1.6V to 2.0V
0.9V
33μF, 6.3V, ceramic
TDK C3225XR0J336V
Switching Frequency (f SW )
L, Inductor
C OUT , Output Capacitor
R TOFF
250kHz
2.5μH, 4.5A, Sumida
CDRH8D28-2R5
330μF, 18m Ω
Sanyo 2R5TPE330MI
POSCAP
221k Ω , 1%
500kHz
1.2μH, 6.8A, Sumida
CDR7D28MN-1R2
220μF, 18m Ω
Sanyo 2R5TPE220MI
POSCAP
110k Ω , 1%
250kHz
2.5μH, 4.5A, Sumida
CDRH8D28-2R5
330μF, 18m Ω
Sanyo 2R5TPE330MI
POSCAP
221k Ω , 1%
500kHz
1.2μH, 6.8A, Sumida
CDR7D28MN-1R2
220μF, 18m Ω
Sanyo 2R5TPE220MI
POSCAP
110k Ω , 1%
Table 2. Component Suppliers
Standard Application Circuit
Coilcraft
SUPPLIER
WEBSITE
www.coilcraft.com
The MAX1515 standard application circuit (Figure 1)
generates a tracking output voltage and a reference
buffer output required for DDR termination regulators.
Coiltronics
Kemet
Panasonic
Sanyo
Sumida
Taiyo Yuden
TDK
TOKO
www.coiltronics.com
www.kemet.com
www.panasonic.com
www.sanyo.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
See Table 1 for component selections. Table 2 lists the
component manufacturers.
Detailed Description
The MAX1515 synchronous, current-mode, constant
off-time, PWM DC-DC converter steps down an input
voltage (V IN ) from +1.3V to +3.6V to an output voltage
from +0.5V to +2.7V. The MAX1515 output delivers up
to 3A of continuous current. Internal 40m Ω NMOS
power switches improve efficiency, reduce component
count, and eliminate the need for a boost diode or any
external Schottky diodes (Figure 2).
12
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