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参数资料
| 型号： | MP2259DJ |
| 厂商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | MO-193AB, TSOT-23, 6 PIN |
| 文件页数： | 3/9页 |
| 文件大小： | 354K |
| 代理商： | MP2259DJ |
MP2259 – 1A, 16V, 1.4MHz STEP-DOWN CONVERTER
MP2259 Rev. 0.91
www.MonolithicPower.com
3
1/14/2008
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2008 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TA = +25°C, unless otherwise noted.
Minimum On-Time (4)
tON
100
ns
Under Voltage Lockout Threshold Rising
2.5
2.8
3.1
V
Under Voltage Lockout Threshold Hysteresis
200
mV
EN Input Low Voltage
0.4
V
En Input High Voltage
1.2
V
VEN = 2V
2
EN Input Current
VEN = 0V
0.1
A
Supply Current (Shutdown)
VEN = 0V
0.1
A
Supply Current (Quiescent)
VEN = 2V, VFB = 1V
1.0
mA
Thermal Shutdown (4)
150
°C
Note:
4) Guaranteed by design.
PIN FUNCTIONS
Pin #
Name Description
1
BST
Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply voltage. It
is connected between SW and BS pins to form a floating supply across the power switch driver.
2
GND
Ground. This pin is the voltage reference for the regulated output voltage. For this reason care
must be taken in its layout. This node should be placed outside of the D1 to C1 ground path to
prevent switching current spikes from inducing voltage noise into the part.
3
FB
Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the
output voltage. To prevent current limit run away during a short circuit fault condition the
frequency foldback comparator lowers the oscillator frequency when the FB voltage is below
250mV.
4
EN
On/Off Control Input. Pull above 1.2V to turn the device on.
5
IN
Supply Voltage. The MP2259 operates from a +4.5V to +16V unregulated input. C1 is needed
to prevent large voltage spikes from appearing at the input.
6
SW
Switch Output.
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