rt9259c Richtek Technology Corporation, rt9259c Datasheet - Page 3

• Manufacturer Part Number: rt9259c
• Description: Synchronous Buck Dc-dc Linear Power Controller
• Manufacturer: Richtek Technology Corporation

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