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参数资料
| 型号： | MAX1917EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR SYNC BUCK 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，DDR |
| 输入电压： | 4.5 V ~ 22 V |
| 输出数： | 2 |
| 输出电压： | 0.4 V ~ 5 V |
| 工作温度： | 0°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) |
Tracking, Sinking and Sourcing, Synchronous Buck
Controller for DDR Memory and Termination Supplies
Typical Operating Characteristics (continued)
(V+ = 12V, V OUT = 1.25V, T A = +25 ° C, unless otherwise noted.)
INDUCTOR PEAK AND VALLEY CURRENT
18
16
14
CURRENT LIMIT vs. TEMPERATURE
18
16
vs. INPUT VOLTAGE AT CURRENT LIMIT
R ILIM = 400k ?
12
10
8
R ILIM = 402k ?
14
12
I PEAK
6
4
R ILIM = 200k ?
10
I VALLEY
2
0
8
CIRCUIT OF FIGURE 3
-40
-20
0
20
40
60
80
100
1
3
5
7
9
11
13
15
TEMPERATURE ( ° C)
V IN (V)
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
EN/HSD
DDR
POK
VTT
ILIM
FSEL
REF
GND
VTTR
V+
VL
DL
PGND
BST
DH
LX
FUNCTION
Enable/High-Side Drain. Connect to the high-side N-FET drain for normal operation. Leave unconnected or
connect to GND for low-power shutdown.
DDR Reference Input. An applied voltage at DDR sets V VTT and V VTTR to 1/2V DDR . DDR voltage range is
from 0 to 3.6V.
Power-OK Output. POK is an open-drain output and is logic high when both VTT and VTTR are within 12%
of regulation. POK is pulled low in shutdown.
VTT Feedback Input. Connect to VTT output.
Current-Limit Threshold Adjustment. Connect a resistor from ILIM to GND to set the current-limit threshold,
or connect ILIM to VL for default setting. See the Setting the Current Limit section.
Frequency Select. Selects the switching frequency of the MAX1917. See Table 1 for configuration of FSEL.
Reference Bypass. Connect a 0.22μF or larger capacitor from REF to GND.
Ground
VTTR Reference Output. Connect a 1μF or larger capacitor from VTTR to GND. VTTR is capable of
sourcing and sinking up to 25mA.
Input Supply Voltage. Supply input for the VL regulator and the VTTR regulator. Bypass with a 0.22μF or
larger capacitor.
Internal Regulator Output. Connect a 2.2μF or larger capacitor from VL to GND. VL can be connected to
V+ if the operating range is 4.5V to 5.5V.
Low-Side MOSFET Gate Drive. Connect to the gate of the low-side N-channel MOSFET.
Power Ground
Bootstrapped Supply to Drive High-Side N-Channel MOSFET. Connect a 0.47μF or larger capacitor from
BST to LX.
High-Side MOSFET Gate Drive. Connect to the high-side N-channel MOSFET gate.
Inductor Switching Node
8
_______________________________________________________________________________________
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