- 您现在的位置：买卖IC网 > PDF目录13573 > MAX1557ETB+T (Maxim Integrated Products)IC REG BUCK SYNC ADJ 0.6A 10TDFN PDF资料下载
参数资料
| 型号： | MAX1557ETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 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： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 5.5 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 600mA |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
16μA I Q , 1.2A PWM DC-DC
Step-Down Converters
Table 2. Inductor Selection
MANUFACTURER
Taiyo Yuden
Taiyo Yuden
TOKO
TOKO
Sumida
TOKO
Murata
Sumitomo
Sumitomo
PART
LMNP04SB3R3N
LMNP04SB4R7N
D52LC
D52LC
CDRH3D16
D412F
LQH32CN
CXL180
CXLD140
VALUE (μH)
3.3
4.7
3.5
4.7
4.7
4.7
4.7
4.7
4.7
DCR (m ? )
36
50
73
87
50
100*
97
70*
100*
I SAT (mA)
1300
1200
1340
1140
1200
1200*
790
1000*
800*
SIZE (mm)
5 x 5 x 2.0
5 x 5 x 2.0
5 x 5 x 2.0
5 x 5 x 2.0
3.8 x 3.8 x 1.8
4.8 x 4.8 x 1.2
2.5 x 3.2 x 2.0
3.0 x 3.2 x 1.7
2.8 x 3.2 x 1.5
SHIELDED
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
*Estimated based upon similar-valued prototype inductors.
V DROPOUT = I OUT x (R DS(ON)P + DCR)
R DS(ON)P is given in the Electrical Characteristics. DCR
for a few recommended inductors is listed in Table 2.
Soft-Start
The MAX1556/MAX1556A/MAX1557 use soft-start to
eliminate inrush current during startup, reducing tran-
sients at the input source. Soft-start is particularly use-
ful for higher-impedance input sources such as Li+ and
alkaline cells. Connect the required soft-start capacitor
from SS to GND. For most applications using a 22μF
output capacitor, connect a 1000pF capacitor from SS
to GND. If a larger output capacitor is used, then use
the following formula to find the value of the soft-start
capacitor:
Thermal Shutdown
As soon as the junction temperature of the
MAX1556/MAX1556A/MAX1557 exceeds +160°C, the
ICs go into thermal shutdown. In this mode the internal
p-channel switch and the internal n-channel synchro-
nous rectifier are turned off. The device resumes nor-
mal operation when the junction temperature falls
below +145°C.
Applications Information
The MAX1556/MAX1556A/MAX1557 are optimized for
use with small external components. The correct selec-
tion of inductors and input and output capacitors
ensures high efficiency, low output ripple, and fast tran-
sient response.
C SS =
C OUT
22000
Adjusting the Output Voltage
The MAX1556/MAX1556A/MAX1557 offer preset output
Soft-start is implemented by exponentially ramping up
the output voltage from 0 to V OUT(NOM) with a time con-
stant equal to C SS times 200k ? (see the Typical
Operating Characteristics). Assuming three time con-
stants to full output voltage, use the following formula to
calculate the soft-start time:
t SS = 600 x 10 3 x C SS
Shutdown Mode
Connecting SHDN to GND or logic low places the
MAX1556/MAX1556A/MAX1557 in shutdown mode and
reduces supply current to 0.1μA. In shutdown, the con-
trol circuitry and the internal p-channel and n-channel
MOSFETs turn off and LX becomes high impedance.
Connect SHDN to IN or logic high for normal operation.
voltages of 1.0V, 1.2V, 1.3V, 1.5V, 1.8V, 2.5V, and 3.3V
as well as an adjustable output using external resistors.
Whenever possible, the preset outputs (set by D1 and
D2) should be used. With external resistor feedback,
noise coupling to FB can cause alternate LX pulse to
terminate early resulting in an inductor current wave-
form with alternate large and small current pulses. See
the External Feedback Switching Waveforms graph in
Typical Operating Characteristics section. Note that
external feedback and the alternating large-small pulse
waveform do not impact loop stability and have no
harmful effect on regulation or reliability.
The adjustable output is selected when D1 = D2 = 0
and an external resistor-divider is used to set the output
voltage (see Figure 6). The MAX1556/MAX1557 have a
defined line- and load-regulation slope. The load regu-
lation is for both preset and adjustable outputs and is
described in the Electrical Characteristics table and
Figures 4 and 5. The impact of the line-regulation slope
_______________________________________________________________________________________
9
相关PDF资料 |
PDF描述 |
|---|---|
| GEA44DTMH | CONN EDGECARD 88POS R/A .125 SLD |
| GEA44DTMD | CONN EDGECARD 88POS R/A .125 SLD |
| MAX860CSA+T | IC REG SWITCHD CAP DBL INV 8SOIC |
| GCA36DTKI | CONN EDGECARD 72POS DIP .125 SLD |
| MAX861CSA+T | IC REG SWITCHD CAP DBL INV 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15588GTL+ | 制造商:Maxim Integrated Products 功能描述:2-/1-PHASE+1 PHASE QUICKTUNE-PWM CONTROLLER WITH I2C INTERFA - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC PWM CTLR I2C INTERFACE QFN |
| MAX15588GTL+T | 制造商:Maxim Integrated Products 功能描述:2-/1-PHASE+1 PHASE QUICKTUNE-PWM CONTROLLER WITH I2C INTERFA - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC PWM CTLR I2C INTERFACE QFN |
| MAX1558ETB | 制造商:Maxim Integrated Products 功能描述:DUAL 3MM X 3MM 1.2A/PROGRAMMABLE-C - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX1558ETB+ | 制造商:Maxim Integrated Products 功能描述:USB PWR SW DUAL 2.75V TO 5.5V 2A 10TDFN EP - Bulk |
| MAX1558ETB+T | 功能描述:电源开关 IC - USB Dual 1.2A/Prog-Crnt USB Switch w/Autorst RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。