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| 型号： | MAX1541ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/49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
Pin Description (continued)
MAX1540A
PIN
MAX1541
NAME
FUNCTION
Valley Current-Limit Threshold Adjustment for Controller 1. The valley current-limit
threshold defaults to 50mV if ILIM1 is tied to V CC . In adjustable mode, the valley
6
8
ILIM1
current-limit threshold across CSP1 and CSN1 is precisely 1/10 the voltage seen at
ILIM1 over a 250mV to 2.5V range. The logic threshold for switchover to the 50mV
default value is approximately V CC - 1V. When the inductor-saturation protection
threshold is exceeded, ILIM1 sinks 6μA. See the Current-Limit Protection section.
Valley Current-Limit Threshold Adjustment for Controller 2. The valley current-limit
threshold defaults to 50mV if ILIM2 is tied to V CC . In adjustable mode, the valley
7
9
ILIM2
current-limit threshold across CSP2 and CSN2 is precisely 1/10th the voltage seen at
ILIM2 over a 250mV to 2.5V range. The logic threshold for switchover to the 50mV
default value is approximately V CC - 1V. When the inductor-saturation protection
threshold is exceeded, ILIM2 sinks 6μA. See the Current-Limit Protection section.
2.0V Reference Voltage Output. Bypass REF to analog ground with a 0.1μF or greater
8
10
REF
ceramic capacitor. The reference can source up to 50μA for external loads. Loading
REF degrades output voltage accuracy according to the REF load-regulation error.
The reference is disabled when the MAX1540A/MAX1541 are shut down.
—
—
11
12
REFIN1
OD
External Reference Input for Controller 1. REFIN1 sets the main feedback regulation
voltage (V FB1 = V REFIN1 ) of the MAX1541.
Open-Drain Output. Controlled by GATE.
Positive Current-Sense Input for Controller 2. Connect to the positive terminal of the
9
13
CSP2
current-sense element. Figure 14 and Table 9 describe several current-sensing
options. The PWM controller does not begin a cycle unless the current sensed is less
than the valley current-limit threshold programmed at ILIM2.
Negative Current-Sense Input for Controller 2. Connect to the negative terminal of the
10
14
CSN2
current-sense element. Figure 14 and Table 9 describe several current-sensing
options. The PWM controller does not begin a cycle unless the current sensed is less
than the valley current-limit threshold programmed at ILIM2.
Feedback Input for Controller 2:
MAX1540A: Connect to V CC for a +1.5V fixed output or to analog ground (GND) for a
+2.5V fixed output. For an adjustable output (0.7V to 5.5V), connect FB2 to a resistive
11
15
FB2
divider from OUT2. The FB2 regulation level is +0.7V.
MAX1541: Connect to V CC for a +1.8V fixed output or to analog ground (GND) for a
+2.5V fixed output. For an adjustable output (0.7V to 5.5V), connect FB2 to a resistive
divider from OUT2. The FB2 regulation level is +0.7V.
Output Voltage-Sense Connection for Controller 2. Connect directly to the positive
terminal of the output capacitors as shown in the standard application circuits
(Figures 1 and 12). OUT2 senses the output voltage to determine the on-time for the
12
16
OUT2
high-side switching MOSFET. OUT2 also serves as the feedback input when using
the preset internal output voltages as shown in Figure 10. When discharge mode is
enabled by OVP/UVP, the output capacitor is discharged through an internal 10 Ω
resistor connected between OUT2 and ground.
______________________________________________________________________________________
17
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