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RT9259CPQV Datasheet(PDF) 3 Page - Richtek Technology Corporation

Part # RT9259CPQV
Description  12V Synchronous Buck PWM DC-DC and Linear Power Controller
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9259CPQV Datasheet(HTML) 3 Page - Richtek Technology Corporation

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RT9259C
3
DS9259C-03
August 2007
www.richtek.com
Function Block Diagram
Driver
Logic
GND
LGATE
BOOT
UGATE
PHASE
Soft-Start
&
Fault Logic
Oscillator
Power
On Reset
VCC12
FB
Voltage
Reference
Bias
EA
+
-
PWM
+
-
+
POR
SSE
5V
Regulator
+
-
+
-
+
-
+
VCC12
0.4V
FBL
DRV
RT_DIS
Shutdown
Inhibit
SSE
COMP
PGND
-
+
5VDD
+
-
PH_M
OC
40uA
1.5V
V
REF1
V
REF2
0.4V
R
OCSET
20k
Pin No.
RT9259C S RT9259C A
RT9259CPQV
Pin
Name
Pin Function
6
6
4
FBL
Linear regulator feedback voltage. This pin is the
inverting input of the LDO error amplifier and protection
monitor. Connect this pin to an external resistor divider
network of the linear regulator.
7
7, 8
5
GND
Ground.
8
9, 10
7
VCC12
Connect this pin to a well-decoupled 12V bias supply. It is
also the positive supply for the lower gate driver, LGATE.
9, 10
11, 12
6, 8, 9, 10,
Exposed Pad (17)
NC
No Internal Connection.
11
13
11
LGATE
Lower gate driver output. Connect to the gate of the
low-side power N-MOSFET. This pin is monitored by the
adaptive shoot-through protection circuitry to determine
when the lower MOSFET has turned off.
12
14
12
PGND
Power ground return for the lower gate driver.
13
15
13
PHASE
Connect this pin to the source of the upper MOSFET and
the drain of the lower MOSFET. This pin is monitored by
the
adaptive
shoot-through
protection
circuitry
to
determine when the upper MOSFET has turned off.
14
16
14
UGATE
Connect this pin to a well-decoupled 12V bias supply. It is
also the positive supply for the lower gate driver, LGATE.


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