参数资料
| 型号： | MIC4744YTSE TR |
| 厂商： | Micrel Inc |
| 文件页数： | 4/23页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A DL 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可调至 0.6V |
| 输入电压： | 2.9 V ~ 5.5 V |
| 频率 - 开关： | 4MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-EPAD TSSOP |
Micrel, Inc.
Absolute Maximum Ratings (1)
Supply Voltage (V IN ) ......................................... -0.3V to +6V
Output Switch Voltage (V SW1, V SW2 ).................. -0.3V to +6V
Output Switch Current (I SW1, I SW2 )………...Internally Limited
Input Voltage (V EN ), (V FB ), (V BIAS ) ...................... -0.3V to V IN
Storage Temperature (T s ) ......................... –60°C to +150°C
Junction Temperature ................................................ 150°C
Lead Temperature (soldering, 10sec.)....................... 260°C
ESD Rating (3) ................................................................. 2KV
MIC4744
Operating Ratings (2)
Supply Voltage (V IN )..................................... +2.9V to +5.5V
Logic Input Voltage (V EN ) ....................................... 0V to V IN
Junction Temperature (T J ) ........................ –40°C to +125°C
Junction Thermal Resistance
MLF ? ( θ JA )..........................................................60°C/W
EPAD TSSOP ( θ JA )............................................35°C/W
Electrical Characteristics (4)
V IN = V EN = 3.6V; L = 1.0μH; C OUT = 4.7μF; T A = 25°C, unless noted. Bold values indicate –40°C< T J < +125°C.
Parameter
Supply Voltage Range
Under-Voltage Lockout Threshold
Condition
Turn-on
Min
2.9
2.45
Typ
2.6
Max
5.5
2.7
Units
V
V
UVLO Hysteresis
100
mV
Quiescent Current
Shutdown Current
V FB = 0.9 * V NOM (not switching); V IN = 5.5V
V FB = 0.9 * V NOM (not switching); V IN = 3.6V
V EN = 0V
1.4
1.0
1.6
3.0
10
mA
mA
μA
[Adjustable] Feedback Voltage
± 2% (over temperature) I LOAD = 100μA
0.588
0.6
0.612
V
FB pin input current
1
nA
Current Limit
V FB = 0.9 * V NOM
2.5
4.3
A
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
Switch ON-Resistance
V IN = 2.9V to 5.5V; I LOAD = 100μA
20mA < I LOAD < 2A
V FB ≤ 0.9 * V NOM
I SW = 50mA V FB =GND
100
0.07
0.2
155
%
%
%
m ?
Oscillator Frequency
Switching Phase
Enable Threshold
Enable Hysteresis
Enable Input Current
Over-Temperature Shutdown
Over-Temperature Hysteresis
3.0
0.5
3.8
180
0.9
55
0.1
153
18
4.4
1.3
2
MHz
°C
V
mV
μA
° C
° C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
March 2009
4
M9999-030209-C
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