参数资料
型号: MAX730AESA+T
厂商: Maxim Integrated Products
文件页数: 10/16页
文件大小: 0K
描述: IC REG BUCK 5V 0.45A 8SOIC
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: 固定
输出数: 1
输出电压: 5V
输入电压: 5.2 V ~ 11 V
PWM 型: 电流模式
频率 - 开关: 170kHz
电流 - 输出: 450mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-SOIC
5V, Step-Down,
Current-Mode PWM DC-DC Converters
V IN = +6.0V TO +16.0V
SHDN
OVERCURRENT COMPARATOR
V+
C2
1 μ F
C3 *
SLOPE COMPENSATION
OUT
BIAS
GEN
Σ
RAMP
GEN
R SENSE
C5
330pF
CC
ERROR AMP
R
F/F
Q
CURRENT
SENSE AMP
R1
510k
REF
1.23V
BANDGAP
PWM
COMPARATOR
S
LX
L1
D1
1N5817
V OUT =
+5V
C4 *
C6
0.01 μ F
1M
±35%
SS CLAMP
OSC
MAX730A
MAX738A
MAX744A
C1
0.1 μ F
SS
UNDERVOLTAGE
LOCKOUT
VUVLO
GND
*SEE TABLE 2 FOR COMPONENT VALUES AND SUPPLIERS
Figure 1. Detailed Block Diagram with External Components
single 100μH (MAX7__AC) or 33μH (MAX7__AE/AM)
inductor. The inductor’s incremental saturation current
rating should be greater than 1A, and its DC resistance
should be less than 0.8 ? . Table 2 lists inductor types
and suppliers for various applications. The surface-
mount inductors have nearly equivalent efficiencies to
the larger through-hole inductors.
Output Filter Capacitor Selection
The primary criterion for selecting the output filter
capacitor is low equivalent series resistance (ESR).
The product of the inductor current variation and the
output capacitor’s ESR determines the amplitude of the
sawtooth ripple seen on the output voltage. Also, mini-
mize the output filter capacitor’s ESR to maintain AC
stability. The capacitor ’s ESR should be less than
0.25 ? to keep the output ripple less than 50mVp-p over
the entire current range (using a 100μH inductor).
Capacitor ESR rises as the temperature falls, and
excessive ESR is the most likely cause of trouble at
temperatures below 0°C. Sanyo OS-CON series
through-hole and surface-mount tantalum capacitors
exhibit low ESR at temperatures below 0°C. Refer to
Table 2 for recommended capacitor values and sug-
gested capacitor suppliers.
Other Components
The catch diode should be a Schottky or high-speed
silicon rectifier with a peak current rating of at least
1.5A for full-load (750mA) operation. The 1N5817 is a
good choice. The 330pF outer-loop compensation
capacitor provides the widest input voltage range and
best transient characteristics. For low-current applica-
tions, the 510k ? resistor may be omitted (see the
Maximum Output Current vs. Supply Voltage graph (R1
removed) in the Typical Operating Characteristics).
10
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