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RT7264AZSP

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
RT7264A
®
DS7264A-01 September 2012 www.richtek.com
1
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
©
4A, 21V, 500kHz Synchronous Step-Down Converter
General Description
The RT7264A is a synchronous step-down regulator with
an internal power MOSFET. It achieves 4A of continuous
output current over a wide input supply range with excellent
load and line regulation. Current mode operation provides
fast transient response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle current
limiting and thermal shutdown. An adjustable soft-start
reduces the stress on the input source at startup.
The RT7264A requires a minimal number of readily
available external components, providing a compact
solution.
Features
zz
zz
z
Wide Input Range : 4.5V to 21V
zz
zz
z Adjustable Output from 0.808V to 15V
zz
zz
z 4A Output Current
zz
zz
z 120m
ΩΩ
ΩΩ
Ω/40m
ΩΩ
ΩΩ
Ω Internal Power MOSFET Switch
zz
zz
z Internal Compensation Minimizes External Parts
zz
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z 500kHz Fixed Switching Frequency
zz
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z Synchronized External Clock from 300kHz to 2MHz
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z Adjustable Soft-Start
zz
zz
z Cycle-by-Cycle Over Current Limit
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z Thermal Shutdown Protection
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z Available in SOP-8 (Exposed Pad) and WDFN-14L
4x3 Packages
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z RoHS Compliant and Halogen Free
Ordering Information
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Applications
z Distributive Power Systems
z Battery Charger
z DSL Modems
z Pre-Regulator for Linear Regulators
Package Type
QW : WDFN-14L 4x3 (W-Type)
SP : SOP-8 (Exposed Pad-Option 2)
RT7264A
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Simplified Application Circuit
VIN
EN/SYNC
GND
BOOT
FB
SW
L
R2
RT7264A
C
BOOT
R
T
C
IN
C
OUT
R1
VCC
C
C
V
IN
V
OUT
Chip Enable
RT7264A
2
DS7264A-01 September 2012www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Functional Pin Description
Pin No.
WDFN-14L 4x3
SOP-8
(Exposed Pad)
Pin Name
Pin Function
1 1 VIN
Power Input. VIN supplies the power to the IC, as well as the
step-down converter switches. Drive VIN with a 4.5V to 21V
power source. Bypass VIN to GND with a suitably large
capacitor to eliminate noise on the input to the IC.
2, 3, 4, 5 2, 3 SW
Switch Node. SW is the switching node that supplies power to
the output. Connect the output LC filter from SW to the output
load. Note that a capacitor is required from SW to BOOT to
power the high side switch.
6 4 BOOT
Bootstrap for High Side Gate Driver. Connect a 100nF or greater
capacitor from SW to BOOT to power the high side switch driver.
7 5 EN/SYNC
Enable or External Frequency Synchronization Input. For
automatic start-up, connect the EN/SYNC pin to VIN with a
100kΩ resistor. The switching frequency can be changed by an
external clock applying to the SYNC pin.
8 6 FB
Feedback Input. FB senses the output voltage via an external
resistive voltage divider. The feedback reference voltage is
0.808V typically.
9 -- PGOOD
Power Good Indicator is an Open Drain Output. The power good
rising/falling threshold is 90%/70% of regulation output voltage.
10 -- SS
Soft-Start Control Input. Connect a capacitor from SS to GND to
set the soft-start period.
11 7 VCC
Bias Supply. Decouple with 0.1μF to 0.22μF capacitor between
this pin and GND.
12, 13, 15
(Exposed Pad)
8,
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
14 -- AGND
Analog Ground. Connect this pin to the system ground in PCB
layout.
Pin ConfigurationsMarking Information
SOP-8 (Exposed Pad)
(TOP VIEW)
WDFN-14L 4x3
VIN
SW
SW
SW
AGND
GND
GND
SS
VCC
SW
BOOT
PGOOD
EN/SYNC
FB
13
12
11
1
2
3
4
5
14
69
10
GND
15
78
VIN
SW
SW
BOOT
GND
VCC
EN/SYNC
FB
GND
2
3
4
5
6
7
8
9
11 : Product Code
YMDNN : Date Code
RT7264AZQW
RT7264AZSP : Product Number
YMDNN : Date Code
RT7264AZSP
11 YM
DNN
RT7264A
ZSPYMDNN
RT7264A
3
DS7264A-01 September 2012 www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Function Block Diagram
For WDFN-14L 4x3 Package
For SOP-8 (Exposed Pad) Package
Regulator
VIN
V
A
V
C
+
-
1.2V
Shutdown
Comparator
FB
SS
PGOOD
EN/SYNC
VCC
+
-
1.7V
1µA
3V
5k
Lockout
Comparator
Reference
+
-
V
C
Error
Amplifier
+
10µA
+
-
400k
30pF
1pF
S
Q
R
Driver
-
+
Current Sense
Amplifier
PWM
Comparator
Oscillator
Ramp
Generator
SW
BOOT
GND
+
-
V
A
S
Q
R
Driver
-
+
Current Sense
Amplifier
PWM
Comparator
Oscillator
Ramp
Generator
Regulator
Reference
+
-
Error
Amplifier
SW
BOOT
FB
EN/SYNC
VIN
+
-
GND
VCC
+
-
1.2V
+
-
1.7V
1µA
3V
5k
Lockout
Comparator
Shutdown
Comparator
400k
30pF
1pF
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

RT7264AZSP

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IC REG BUCK ADJUSTABLE 4A 8SOP
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