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| 型号： | MAX1742EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1A 16QSOP |
| 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： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 1.5V，1.8V，2.5V，可调 |
| 输入电压： | 3 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1A |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T A = +25°C, unless otherwise noted.)
MAX1842
LOAD-TRANSIENT RESPONSE
MAX1842 toc17
MAX1842
LINE-TRANSIENT RESPONSE
MAX1842 toc18
V INPUT
2V/div
10 μ s/div
V OUTPUT
50mV/div
I L
2A/div
0
V OUTPUT
20mV/div
AC-COUPLED
20 μ s/div
I OUT = 2.5A, V OUT = 1.5V, R TOFF = 100k Ω , L = 2.2 μ H
Pin Description
PIN
1
2, 4
3, 14, 16
5
6
7
8
9
10
11
12
13, 15
NAME
SHDN
IN
LX
SS
COMP
TOFF
FB
GND
REF
FBSEL
V CC
PGND
FUNCTION
Shutdown Control Input. Drive SHDN low to disable the reference, control circuitry, and internal
MOSFETs. Drive high or connect to V CC for normal operation.
Supply Voltage Input—for the internal PMOS power switch.
Connection for the drains of the PMOS power switch and NMOS synchronous-rectifier switch. Connect
the inductor from this node to the output filter capacitor and load.
Soft-Start. Connect a capacitor from SS to GND to limit inrush current during startup.
Integrator Compensation. Connect a capacitor from COMP to V CC for integrator compensation. See
Integrator Amplifier section.
Off-Time Select Input. Sets the PMOS power switch off-time during constant-off-time operation. Connect a
resistor from TOFF to GND to adjust the PMOS switch off-time.
Feedback Input—for both preset-output and adjustable-output operating modes. Connect directly to
output for fixed-voltage operation or to a resistive divider for adjustable operating modes.
Analog Ground
Reference Output. Bypass REF to GND with a 1μF capacitor.
Feedback Select Input. Selects output voltage. See Table 3 for programming instructions.
Analog Supply Voltage Input. Supplies internal analog circuitry. Bypass V CC with a 10 Ω and 2.2μF low-
pass filter. See Figure 1.
Power Ground. Internally connected to the internal NMOS synchronous-rectifier switch.
8
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