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C3225X5R1C22M Datasheet(PDF) 10 Page - Richtek Technology Corporation

Part # C3225X5R1C22M
Description  2A, 18V, 1.2MHz Synchronous Step-Down Converter
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

C3225X5R1C22M Datasheet(HTML) 10 Page - Richtek Technology Corporation

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RT7247B
10
DS7247B-01
September 2012
www.richtek.com
©
Copyright
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
RT7247B
EN
GND
100k
VIN
REN
Q1
EN
RT7247B
EN
GND
VIN
REN
CEN
EN
SW
BOOT
5V
RT7247B
0.1µF
RT7247B
GND
FB
R1
R2
VOUT
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 pin and SW pin. 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
RT7247B. Note that the external boot voltage must be
lower than 5.5V
Figure 2. External Bootstrap Diode
Soft-Start
The RT7247B provides soft-start function. The soft-start
function is used to prevent large inrush current while
converter is being powered-up. The soft-start timing can
be programmed by the external capacitor between SS and
GND. An internal current source ISS (6
μA) charges an
external capacitor to build a soft-start ramp voltage. The
VFB voltage will track the internal ramp voltage during soft-
start interval. The typical soft-start time is calculated as
follows :
An external MOSFET can be added to implement digital
control on the EN pin when no system voltage above 2V
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.
Chip Enable Operation
The EN pin is the chip enable input. Pulling the EN pin
low (<0.4V) will shut down the device. During shutdown
mode, the RT7247B quiescent current drops to lower than
3
μA. Driving the EN pin high (>2V, <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).
SS
SS
SS
SS
0.8 C
Soft-Start time t
=
, if C
capacitor
I
0.8 0.1
is 0.1 F, then soft-start time =
13.5ms
6
μ
μ
μ
×
×
Figure 3. Enable Timing Control
Figure 4. Digital Enable Control Circuit


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