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参数资料
| 型号： | MAX5090CATE/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 16WQFN |
| 产品变化通告： | Product Discontinuation 28/Nov/2011 |
| 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： | 1.27 V ~ 11 V |
| 输入电压： | 6.5 V ~ 76 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 127kHz |
| 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-WQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
2A, 76V, High-Efficiency MAXPower Step-Down
DC-DC Converters
Pin Description
PIN
1, 2
3
4
5
6
7
8
9
10
11, 15, 16
12
13, 14
—
NAME
LX
BST
V IN
VD
SYNC
SS
FB
ON/ OFF
SGND
N.C.
PGND
DRAIN
EP
FUNCTION
Source Connection of Internal High-Side Switch
Boost Capacitor Connection. Connect a 0.22μF ceramic capacitor from BST to LX.
Input Voltage. Bypass V IN to SGND with a low-ESR capacitor as close to the device as possible.
Internal Regulator Output. Bypass VD to PGND with a 3.3μF/10V or greater ceramic capacitor.
Synchronization Input. Connect SYNC to an external clock for synchronization. Connect to SGND to
select the internal 127kHz switching frequency.
Soft-Start Capacitor Connection. Connect an external capacitor from SS to SGND to adjust the soft-
start time.
Output Sense Feedback Connection.
For fixed output voltage (MAX5090A/MAX5090B), connect FB to V OUT .
For adjustable output voltage (MAX5090C), use an external resistive voltage-divider to set V OUT . V FB
regulating set point is 1.228V.
Shutdown Control Input. Pull ON/ OFF low to put the device in shutdown mode. Drive ON/ OFF high for
normal operation. Connect ON/ OFF to V IN with short leads for always-on operation.
Signal Ground. SGND must be connected to PGND for proper operation.
No Connection. Not internally connected.
Power Ground
Internal High-Side Switch Drain Connection
Exposed Pad. Solder EP to SGND plane to aid in heat dissipation. Do not use as the only electrical
ground connection.
V UVLO ( TH ) = ? 1 +
? x 1 . 38
Detailed Description
The MAX5090 step-down DC-DC converter operates
from a 6.5V to 76V input voltage range. A unique volt-
?
?
R 1 ?
R 2 ?
age-mode control scheme with voltage feed-forward
and an internal switching DMOS FET provides high effi-
ciency over a wide input voltage range. This pulse-
width-modulated converter operates at a fixed 127kHz
switching frequency or can be synchronized with an
external system clock frequency. The device also fea-
tures automatic pulse-skipping mode to provide high
efficiency at light loads. Under no load, the MAX5090
consumes only 310μA, and in shutdown mode, con-
sumes only 20μA. The MAX5090 also features under-
voltage-lockout, hiccup-mode output short-circuit
protection and thermal shutdown.
ON/ OFF /Undervoltage Lockout (UVLO)
Use the ON/ OFF function to program the external UVLO
threshold at the input. Connect a resistive voltage-
divider from V IN to SGND with the center node to
ON/ OFF , as shown in Figure 1. Calculate the threshold
value by using the following formula:
Set the external V UVLO(TH) to greater than 6.45V. The
maximum recommended value for R2 is less than 1M ? .
ON/ OFF is a logic input and can be safely driven to the
full V IN range. Connect ON/ OFF to V IN for automatic
startup. Drive ON/ OFF to ground to shut down the
MAX5090. Shutdown forces the internal power MOSFET
off, turns off all internal circuitry, and reduces the V IN
supply current to 20μA (typ). The ON/ OFF rising thresh-
old is 1.546V (max). Before any operation begins, the
voltage at ON/ OFF must exceed 1.546V. The ON/ OFF
input has 100mV hysteresis.
If the external UVLO threshold setting divider is not
used, an internal undervoltage-lockout feature monitors
the supply voltage at V IN and allows the operation to
start when V IN rises above 6.45V (max). The internal
UVLO rising threshold is set at 6.17V with 0.5V hystere-
sis. The V IN and V ON/ OFF voltages must be above 6.5V
and 1.546V, respectively, for proper operation.
_______________________________________________________________________________________
7
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