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| 型号： | MAX8505EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 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： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 4.68 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz，1MHz |
| 电流 - 输出： | 3A |
| 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 |
3A, 1MHz, 1% Accurate, Internal Switch
Step-Down Regulator with Power-OK
ELECTRICAL CHARACTERISTICS (continued)
(V IN = V CC = V CTL = +3.3V, V FB = 0.8V, V COMP = 1.25V, C REF = 0.01μF, T A = -40°C to +85°C , unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LX Maximum Duty Cycle
LX Minimum Duty Cycle
V IN = V CC = 2.6V, 3.3V,
5.5V
V IN = V CC = 2.6V, 3.3V,
5.5V
500kHz
1MHz
500kHz
1MHz
90
84
8
15
%
%
SLOPE COMPENSATION
Slope Compensation
Extrapolated to 100% duty cycle
245
406
mV
BST
V LX = 5.5V
10
BST Shutdown Supply Current
(V BST - V LX ) = V IN =
V CC = 5.5V, V CTL = 0V
V LX = 0V
LX open
10
10
μA
CTL
For 1MHz
80
CTL Input Threshold
V IN = V CC = 2.6V,
3.3V, 5.5V
For 500kHz
For shutdown
55
70
45
% of
V CC
CTL Input Current
V CTL = 0V or 5.5V, V IN = V CC = 5.5V
-1
+1
μA
POK (Power-OK)
POK Output Voltage, Low
POK Leakage Current
V FB = 0.6V or 1.0V, I POK = 2mA
V POK = 5.5V
100
1
mV
μA
POK Fault Delay Time
From FB to POK, any threshold
25
100
μs
Note 1: Under normal operating conditions, COMP moves between 1.25V and 2.15V as the duty cycle changes from 10% to 90%
and peak inductor current changes from 0 to 3A. Maximum output current is related to peak inductor current, inductor value
input voltage, and output voltage by the following equations:
I OUT _ MAX =
I LIM ? ( 1 ? D ) × t S × V OUT / 2 L
1 + ( 1 ? D ) × t S × ( R NLS + R L ) / 2 L
where V OUT = output voltage; I LIM = current limit of high-side switch; t S = switching period; R L = ESR of inductor; R NLS =
on-resistance of low-side switch; L = inductor. Equations for I LIM and D are shown as follows:
I LIM = I LIM _ DC 100 + V SW
1 ? D
R T
D = OUT O NLS L
where I LIM_DC100 = current limit at D = 100%; R T = transresistance from LX to COMP; V SW = slope compensation (310mV
±20%); D = duty cycle:
V + I ( R + R )
V IN + I O ( R NLS ? R NHS )
where V OUT = output voltage; V IN = input voltage; I O = output current; R L = ESR of inductor; R NHS = on-resistance of high-
side switch; R NLS = on-resistance of low-side switch. See the Typical Application Circuit for external components.
Note 2: Specifications to -40°C are guaranteed by design and not production tested.
Note 3: LX has internal clamp diodes to PGND and IN pins 2 and 4. Applications that forward bias these diodes should take care
not to exceed the IC’s package power dissipation limits.
Note 4: When connected together, the LX output is designed to provide 3.5A RMS current.
_______________________________________________________________________________________
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