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参数资料
| 型号： | MAX8554EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR BUCK PWM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，DDR，DDR2 |
| 输入电压： | 4.5 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 3.5 V |
| 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） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
4.5V to 28V Input, Synchronous PWM Buck Controllers
for DDR Termination and Point-of-Load Applications
ELECTRICAL CHARACTERISTICS (continued)
(V V+ = V HSD = +12V, V EN/HSD = V REFIN = +2.5V, V EN = +5V, C VL = 4.7μF, C VTTR = 1μF, C REF = 0.22μF, V FSEL = 0, ILIM = VL, PGND
= LX = POK = GND, BST = VL, T A = -40°C to +85°C , unless otherwise specified.) (Note 3)
PARAMETER
CONDITIONS
MIN
MAX
UNITS
REFERENCE
Reference Output Voltage
Reference Load Regulation
Reference UVLO
V V+ = V VL = +4.5 to +5.5V, I REF = 0
V V+ = V VL = +5V, I REF = 0 to 50μA
V V+ = V VL = +5V, reference rising, hysteresis = 27mV
1.97
1.5
2.03
10
1.7
V
mV
V
VTTR
VTTR Output Voltage Range
I VTTR = -5mA to +5mA
0
49.5
1.8
50.5
V
VTTR Output Accuracy
I VTTR = -25mA to +25mA, V REFIN = +1.8V
I VTTR = -25mA to +25mA, V REFIN = +3.6V
49
49.5
51
50.5
% V REFIN
SOFT-START
ILIM Ramp Period
Output Predischarge Period
Ramps the ILIM trip threshold from 20% to 100% in
20% increments
Rising edge of EN/HSD to the start of internal digital
soft-start
0.8
0.8
3.0
3.0
ms
ms
OSCILLATOR
FSEL = VL
2.18
2.83
On-Time
MAX8553, V VTT = +1.25V
(Note 2)
FSEL unconnected
FSEL = REF
1.45
1.09
1.89
1.41
μs
FSEL = GND
FSEL = VL
0.82
0.89
1.00
1.16
On-Time
MAX8554, V OUT = +2.5V
(Note 2)
FSEL unconnected
FSEL = REF
0.61
0.43
0.80
0.56
μs
FSEL = GND
0.33
0.41
Off-Time
(Note 2)
420
ns
CURRENT LIMIT
LX to PGND, ILIM = VL
80
115
Current-Limit Threshold (Positive
Direction)
Current-Limit Threshold (Negative
Direction)
LX to PGND, R ILIM = 100k ?
LX to PGND, R ILIM = 400k ?
LX to PGND, ILIM = VL, with respect to positive
current-limit threshold
30
150
-130
65
230
-90
mV
%
ILIM Input Current
FAULT DETECTION
μA
MAX8553 (V REFIN > +1V)
57
63
%
Overvoltage Threshold
MAX8553 (V REFIN ≤ +1V)
MAX8554
0.576
0.696
0.624
0.744
V
VL REGULATOR
Output Voltage
RMS Output Current
Bypass Capacitor
+6V < V V+ < +28V, 1mA < I VL < 35mA
ESR < 100m ?
4.80
2.2
5.33
35
V
mA
μF
6
_______________________________________________________________________________________
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