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参数资料
| 型号： | MAX8643ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 24TQFN |
| 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： | 0.6 V ~ 3.2 V |
| 输入电压： | 2.35 V ~ 3.6 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
3A, 2MHz Step-Down Regulator
with Integrated Switches
ABSOLUTE MAXIMUM RATINGS
IN, V DD , PWRGD to GND ......................................-0.3V to +4.5V
COMP, FB, REFIN, OUT,
CTL_, EN, SS, FREQ to GND...................-0.3V to (V DD + 0.3V)
LX Current (Note 1) .....................................................-4A to +4A
BST to LX..................................................................-0.3V to +4V
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (T A = +70°C)
24-Pin TQFN-EP
(derated 27.8mW/ ° C above +70°C)........................2222.2mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: LX has internal clamp diodes to GND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s package power dissipation limits.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V IN = V DD = 3.3V, V FB = 0.5V, T A = -40°C to +85°C. Typical values are at T A = +25°C, circuit of Figure 1, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IN/V DD
IN and V DD Voltage Range
2.35
3.60
V
IN Supply Current
V DD Supply Current
f S = 1MHz, no load (includes
gate-drive current)
f S = 1MHz
V IN = 2.5V
V IN = 3.3V
V IN = 2.5V
V IN = 3.3V
4
5.5
1.4
2
4.6
2.3
mA
mA
Total Shutdown Current from IN
and V DD
V IN = V DD = V BST - V LX = 3.6V, V EN = 0V
13
μA
V DD Undervoltage Lockout
Threshold
LX starts/stops switching
V DD rising
V DD falling
1.8
2
1.9
2.1
V
BST
Deglitching
2
μs
BST Supply Current
V BST = V DD = V IN = 3.6V,
V LX = 3.6V or 0V, V EN = 0V
T A = +25°C
T A = +85°C
10
5
μA
PWM COMPARATOR
PWM Comparator Propagation
Delay
10mV overdrive
20
ns
COMP
COMP Clamp Voltage, High
COMP Slew Rate
PWM Ramp Amplitude
COMP Shutdown Resistance
V IN = 2.35V to 3.6V
From COMP to GND, V EN = V SS = 0V
2
1.4
1
8
V
V/μs
V
Ω
ERROR AMPLIFIER
Select
Preset Output-Voltage Accuracy
REFIN = SS
-1
from
+1
%
Table 1
FB Regulation Accuracy Using
External Resistors
FB to OUT Resistor
CTL1 = CTL2 = GND
All VID settings except CTL1 = CTL2 = GND
0.594
5
0.600
8
0.606
11
V
k Ω
2
_______________________________________________________________________________________
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