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参数资料
| 型号： | MAX887HESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 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： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 10 V |
| 输入电压： | 3.5 V ~ 11 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 600mA |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
ELECTRICAL CHARACTERISTICS
(V+ = +7V, PGND = GND = 0V, SHDN = V+, (T A = -40°C to +85°C) , unless otherwise noted.) (Note 2)
PARAMETER
Supply Range
SYMBOL
V+
CONDITIONS
MIN
3.5
TYP
MAX
11.0
UNITS
V
Quiescent Supply Current
(PWM Mode)
Quiescent Supply Current
(PFM Mode)
Shutdown Supply Current
Output Voltage Range
I V+, PWM
I V+, PFM
I V+, SHDN
V OUT, RANGE
I OUT = 0mA, SYNC = 3.0V
I OUT = 0mA, SYNC = GND
SHDN = GND
Circuit of Figure 2
1.25
2.7
0.2
2.5
4.0
0.6
5
10.50
mA
mA
μA
V
PWM FB Feedback Threshold
FB Input Current
PWM Switching Frequency
V FB
I FB
f OSC
SYNC = 3.0V, PWM duty cycle = 50%
FB = 1.30V
SYNC = 3.0V
1.222
250
1.250
300
1.278
±0.10
350
V
μA
kHz
High-Side Current Limit
Undervoltage Lockout
Startup Voltage
I LIM+
V +, UVLO
V +, START
V+ falling
V+ rising
0.75
1.00
3.0
3.1
1.50
3.3
3.5
A
V
V
Note 2: Specifications from 0°C to -40°C are guaranteed by design and not production tested.
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2, T A = +25°C, unless otherwise noted.)
DROPOUT VOLTAGE
0.7
vs. LOAD CURRENT
100
EFFICIENCY vs. OUTPUT CURRENT
100
EFFICIENCY vs. OUTPUT CURRENT
0.6
0.5
0.4
3.3V SETTING
V OUT = 3.135V
90
80
70
60
PWM MODE
(SYNC = VL)
V OUT = 3.3V
V IN = 4V
V IN = 9V
90
80
70
60
PWM MODE
(SYNC = VL)
V OUT = 5V
V IN = 7V
V IN = 9V
50
V IN = 5V
50
0.3
0.2
40
30
V IN = 7V
V IN = 11V
40
30
V IN = 5.5V
V IN = 11V
0.1
5V SETTING
V OUT = 4.75V
20
10
20
10
0
0
200
400 600 800
1000
0
0.0001
0.001 0.01 0.1
0.6
0
0.0001
0.001
0.01
0.1
0.6
LOAD CURRENT (mA)
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
_______________________________________________________________________________________
3
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