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VLF10045 Datasheet(PDF) 10 Page - Richtek Technology Corporation

Part # VLF10045
Description  3A, 36V, 500kHz Synchronous Step-Down Converter
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

VLF10045 Datasheet(HTML) 10 Page - Richtek Technology Corporation

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RT7272B
10
DS7272B-01
January 2013
www.richtek.com
Copyright
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
©
Under Voltage Protection
Hiccup Mode
The RT7272B provides Hiccup Mode Under Voltage
Protection (UVP). When the VFB voltage drops below 0.4V,
the UVP function will be triggered to shut down switching
operation. If the UVP condition remains for a period, the
RT7272B will retry automatically. When the UVP condition
is removed, the converter will resume operation. The UVP
is disabled during soft-start period.
Application Information
Output Voltage Setting
The resistive divider allows the FB pin to sense the output
voltage as shown in Figure 1.
Figure 1. Output Voltage Setting
The output voltage is set by an external resistive voltage
divider according to the following equation :
OUT
REF
R1
V
= V
1
R2
⎛⎞
+
⎜⎟
⎝⎠
Where VREF is the reference voltage (0.8V typ.).
External Bootstrap Diode
Connect a 0.1
μF low ESR ceramic capacitor between the
BOOT and SW pins. This capacitor provides the gate driver
voltage for the high side MOSFET.
It is recommended to add an external bootstrap diode
between an external 5V and BOOT pin for efficiency
improvement when input voltage is lower than 5.5V or duty
ratio is higher than 65% .The bootstrap diode can be a
low cost one such as IN4148 or BAT54. The external 5V
can be a 5V fixed input from system or a 5V output of the
RT7272B. Note that the external boot voltage must be
lower than 5.5V
Figure 2. External Bootstrap Diode
Chip Enable Operation
The EN pin is the chip enable input. Pulling the EN pin
low (<0.4V) will shutdown the device. During shutdown
mode, the RT7272B quiescent current drops to lower than
3
μA. Driving the EN pin high (>2.5V, < 18V) will turn on
the device again. For external timing control, the EN pin
can also be externally pulled high by adding a REN resistor
and CEN capacitor from the VIN pin (see Figure 3).
An external MOSFET can be added to implement digital
control on the EN pin when no system voltage above 2.5V
is available, as shown in Figure 4. In this case, a 100k
Ω
pull-up resistor, REN, is connected between VIN and the
EN pin. MOSFET Q1 will be under logic control to pull
down the EN pin.
Figure 3. Enable Timing Control
Figure 4. Digital Enable Control Circuit
RT7272B
GND
FB
R1
R2
VOUT
SW
BOOT
5V
RT7272B
100nF
RT7272B
EN
GND
VIN
REN
CEN
EN
RT7272B
EN
GND
100k
VIN
REN
Q1
EN


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