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参数资料
| 型号： | MAX1541ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/49页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DIVIDER PWM 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 620kHz |
| 占空比： | 100% |
| 电源电压： | 2 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
SATURATION
LIMIT
QUAD-LEVEL
DECODE
9R
V CC - 1.0V
LSAT
ILIM_
DH DRIVER
S
R
0.5V
6 μ A
VALLEY CURRENT
LIMIT
R
Q
CSP_
ZERO
CROSSING
CSN_
SKIP
Figure 5. MAX1540A/MAX1541 Current-Limit Functional Diagram
ment (Figure 1). If the magnitude of the current-sense
( LIR2 )
signal is above the valley current-limit threshold, the
PWM controller is not allowed to initiate a new cycle
(Figures 3 and 5). The actual peak current is greater
than the valley current-limit threshold by an amount
equal to the inductor ripple current. Therefore, the exact
current-limit characteristic and maximum load capability
are a function of the current-sense resistance, inductor
value, and battery voltage. When combined with the
undervoltage protection circuit, this current-limit method
is effective in almost every circumstance. Figure 6
shows the valley current-limit threshold point.
I LIM(VAL) = I LOAD(MAX) 1-
I PEAK
I LOAD
I LIMIT
In forced-PWM mode, the MAX1540A/MAX1541 also
implement a negative current limit to prevent excessive
0
TIME
reverse inductor currents when V OUT is sinking current.
The negative current-limit threshold is set to approxi-
mately 120% of the positive current limit and tracks the
positive current limit when ILIM is adjusted.
The current-limit threshold is adjusted with an external
resistor-divider at ILIM_. A 2μA to 20μA divider current
is recommended for accuracy and noise immunity. The
current-limit threshold adjustment range is from 25mV
to 200mV. In the adjustable mode, the current-limit
threshold voltage is precisely 1/10th the voltage seen at
ILIM_. The threshold defaults to 50mV when ILIM_ is
Figure 6. Valley Current-Limit Threshold Point
connected to V CC . The logic threshold for switchover to
the 50mV default value is approximately V CC - 1V.
Carefully observe the PC board layout guidelines to
ensure that noise and DC errors do not corrupt the dif-
ferential current-sense signals seen by CSP_ and
CSN_. Place the IC close to the sense resistor with
short, direct traces, making a Kelvin-sense connection
to the current-sense resistor.
______________________________________________________________________________________
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