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RT9259 Fiches technique(PDF) 2 Page - Richtek Technology Corporation

No de pièce RT9259
Description  12V Synchronous Buck PWM DC-DC and Linear Power Controller
PDF  15 Pages
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Fabricant  RICHTEK [Richtek Technology Corporation]
Site Internet  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9259 Fiches technique(HTML) 2 Page - Richtek Technology Corporation

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RT9259
2
DS9259-03T00
August 2007
www.richtek.com
Typical Application Circuit
Functional Pin Description
Pin Configurations
(TOP VIEW)
To be continued
SOP-14
FBL
DRV
COMP
RT_DIS
GND
PHASE
FB
VCC12
NC
NC
BOOT
PGND
UGATE
LGATE
2
3
4
11
12
13
14
5
6
7
8
9
10
VQFN-16L 4x4
V
IN2
+5V to +12V
V
OUT1
Q1
Q2
C
IN
RT9259
V
IN1
+3.3V/+5V/+12V
BOOT
DRV
PHASE
UGATE
LGATE
PGND
FB
GND
C
OUT
L
OUT
1
COMP
FBL
RT_DIS
V
OUT2
C
OUT2
Q3
VCC12
V
CC
+12V
NC
NC
6
7
8
9
10
11
4
5
12
13
14
2
3
15
16
UGATE
BOOT
NC
NC
VCC12
VCC12
LGATE
PGND
PHASE
GND
GND
FBL
DRV
FB
COMP
RT_DIS
SSOP-16
Pin No.
RT9259 S RT9259 A RT9259PQV
Pin Name
Pin Function
1
1
15
BOOT
Bootstrap supply for the upper gate driver. Connect the
bootstrap capacitor between BOOT pin and the PHASE pin.
The bootstrap capacitor provides the charge to turn on the
upper MOSFET.
2
2
16
RT_DIS
Connect a resistor from RT_DIS to GND to set frequency. In
addition, if this pin is pulled down towards GND, it will disable
both regulator outputs until released.
3
3
1
COMP
Buck converter external compensation. This pin is used to
compensate the control loop of the buck converter.
4
4
2
FB
Buck converter feedback voltage. This pin is the inverting input
of the PWM error amplifier. FB senses the switcher output
through an external resistor divider network.
5
5
3
DRV
Connect this pin to the gate of an external MOSFET. This pin
provides the drive for the linear regulator
’s pass MOSFET.
12
11
10
9
13
14
15
16
1
2
3
4
8
7
6
5
FBL
DRV
COMP
FB
PGND
LGATE
NC
NC
17



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