参数资料
型号: MAX1845ETX+T
厂商: Maxim Integrated Products
文件页数: 8/27页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 36-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: 540kHz
电源电压: 4.5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 36-WFQFN 裸露焊盘
包装: 带卷 (TR)
Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
Typical Operating Characteristics (continued)
(Circuit of Figure 1, components from Table 1, V IN = 15V, SKIP = GND, TON = unconnected, T A = +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
(8A COMPONENTS, PWM MODE, V OUT1 = 1.8V)
MAX1845 toc07b
STARTUP WAVEFORM
(4A COMPONENTS, SKIP = GND, V OUT2 = 2.5V)
MAX1845 toc09
V OUT2
SHUTDOWN WAVEFORM
(4A COMPONENTS, SKIP = GND, V OUT2 = 2.5V)
MAX1845 toc09
V OUT2
1V/div
1V/div
V OUT1
100mV/div
I OUT1
5A/div
I OUT2
2A/div
I OUT2
5A/div
20 μ s/div
400μs/div
100 μ s/div
Pin Description
PIN
NAME
FUNCTION
QSOP
QFN
Output Voltage Connection for the OUT1 PWM. Connect directly to the junction of the external
1
32
OUT1
inductor and output filter capacitors. OUT1 senses the output voltage to determine the on-time
and also serves as the feedback input in fixed-output modes.
2
33
FB1
Feedback Input for OUT1. Connect to GND for 1.8V fixed output or to V CC for 1.5V fixed output, or
connect to a resistor-divider network from OUT1 for an adjustable output between 1V and 5.5V.
Current-Limit Threshold Adjustment for OUT1. The current-limit threshold at CS1 is 0.1 times the
3
34
ILIM1
voltage at ILIM1. Connect a resistor-divider network from REF to set the current-limit threshold
between 25mV and 250mV (with 0.25V to 2.5V at ILIM). Connect to V CC to assert 50mV default
current-limit threshold.
4
35
V+
Battery Voltage-Sense Connection. Connect to input power source. V+ is only used to adjust the
DH_ on-time for pseudofixed-frequency operation.
On-Time Selection Control Input. This four-level input pin sets the DH_ on-time to determine the
operating frequency.
TON
FREQUENCY (OUT1) (kHz)
FREQUENCY (OUT2) (kHz)
5
1
TON
AGND
620
460
REF
Open
V CC
485
345
235
355
255
170
6
2
SKIP
Pulse-Skipping Control Input. Connect to V CC for low-noise forced-PWM mode. Connect to AGND
to enable pulse-skipping operation.
8
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