rt9259 Richtek Technology Corporation, rt9259 Datasheet - Page 3

• Manufacturer Part Number: rt9259
• Description: Synchronous Buck Dc-dc Linear Power Controller
• Manufacturer: Richtek Technology Corporation

RT_DIS
DS9259-03T00 August 2007
Function Block Diagram
RT9259 S RT9259 A
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.
6
Shutdown
Oscillator
+
+
-
V
REF2
Reference
Exposed Pad (17)
Voltage
V
RT9259PQV
REF1
6, 8, 9, 10,
0.4V
11
12
13
14
FB
4
5
7
SSE
-
+
-
+
+
+
-
Pin Name
EA
FBL
GND
VCC12
NC
LGATE
PGND
PHASE
UGATE
Bias
COMP
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 protection circuitry to 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
Pin Function
PH_M
-
+
+
-
0.4V
1.5V
5VDD
20k
40uA
R
OCSET
RT9259
www.richtek.com
VCC12
BOOT
UGATE
PHASE
LGATE
PGND
3