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参数资料
| 型号： | LSP5502SC |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 470 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 5/11页 |
| 文件大小： | 275K |
| 代理商： | LSP5502SC |
LSP5502
2A Synchronous Step Down DC/DC Converter
3/11
Rev. 1.7
www.liteon-semi.com
M1
0.12Ω
M2
0.12Ω
Supply Current in Shutdown
VEN = 0
0.3
3.0
A
IC Supply Current in Operation
VEN = 3V, VFB = 1.0V
1.4
1.5
mA
Input UVLO Threshold Rising
UVLO
VEN Rising
3.80
4.05
4.40
V
Input UVLO Threshold Hysteresis
210
mV
Soft-start Current
VSS = 0V
6
A
Soft-start Period
CSS = 0.1F
15
mS
Thermal Shutdown Temperature
Hysteresis = 10°C
160
°C
FUNCTIONAL BLOCK DIAGRAM
6
7
8
5
2
1
3
4
INTERNAL
REGULATORS
FB
SS
COMP
EN
7V
Zener
1.1V
0.3V
0.925V
2.5V
1.5V
OVP
SHUTDOWN
COMPARATOR
ERROR
AMPLIFIER
LOCKOUT
COMPARATOR
EN OK
6uA
OSCILLATOR
150/400KHz
RAMP
CLK
1.2V
OVP
IN<4.10V
IN
CURRENT
COMPARATOR
CURRENT
SENSE
AMPLIFIER
5V
IN
BS
SW
GND
S Q
R Q
FUNCTIONAL DESCRIPTION
The LSP5502 is a synchronous rectified, cur-rent-mode, step-down regulator. It regulates in-put voltages from 4.5V
to 23V down to an out-put voltage as low as 0.925V, and supplies up to 2A of load current.
The LSP5502 uses current-mode control to regulate the output voltage. The output voltage is measured at FB
through a resistive voltage divider and amplified through the internal trans-conductance error amplifier. The voltage
at the COMP pin is compared to the switch current
measured internally to control the output voltage.
The converter uses internal N-Channel MOSFET switches to step-down the input voltage to the regulated output
voltage. Since the high side MOSFET requires a gate voltage greater than the input voltage, a boost capacitor
connected between SW and BS is needed to drive the high side gate. The boost capacitor is charged from the
internal 5V rail when SW is low.
When the LSP5502 FB pin exceeds 20% of the nominal regulation voltage of 0.925V, the over volt-age comparator
is tripped and the COMP pin and the SS pin are discharged to GND, forcing the high-side switch off.
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