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RT7264AZSP

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
RT7264A
4
DS7264A-01 September 2012www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Operation
The RT7264A is a constant frequency, current mode
synchronous step-down converter. In normal operation,
the high side N-MOSFET is turned on when the S-R latch
is set by the oscillator and is turned off when the current
comparator resets the S-R latch. While the high side
N-MOSFET is turned off, the low side N-MOSFET is turned
on to conduct the inductor current until next cycle begins.
Error Amplifier
The error amplifier adjusts its output voltage by comparing
the feedback signal (V
FB
) with the internal reference. When
the load current increases, it causes a drop in the feedback
voltage relative to the reference, the error amplifier's output
voltage then rises to allow higher inductor current to match
the load current.
Oscillator
The internal oscillator runs at fixed frequency 500kHz. In
short circuit condition, the frequency is reduced to 150kHz
for low power consumption.
Internal Regulator
The regulator provides low voltage power to supply the
internal control circuits and the bootstrap power for high
side gate driver.
Enable
The converter is turned on when the EN pin is higher than
2V. When the EN pin is lower than 0.4V, the converter will
enter shutdown mode and reduce the supply current to
be less than 1μA.
Soft-Start (SS)
An internal current source charges an internal capacitor
to build a soft-start ramp voltage. The FB voltage will track
the internal ramp voltage during soft-start interval. The
typical soft-start time is 4ms.
UV Comparator
If the feedback voltage (V
FB
) is lower than 0.4V, the UV
Comparator will go high to turn off the high side MOSFET.
The output under voltage protection is designed to operate
in Hiccup mode. When the UV condition is removed, the
converter will resume switching.
Thermal Shutdown
The over temperature protection function will shut down
the switching operation when the junction temperature
exceeds 150°C. Once the junction temperature cools
down by approximately 30°C, the converter will
automatically resume switching.
RT7264A
5
DS7264A-01 September 2012 www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage, VIN ---------------------------------------------------------------------------------- −0.3V to 26V
z Switch Voltage, SW ----------------------------------------------------------------------------------------- −0.3V to (V
IN
+ 0.3V)
z Boot Voltage, BOOT ----------------------------------------------------------------------------------------- (SW − 0.3V) to (SW + 6V)
z Other Pins------------------------------------------------------------------------------------------------------ −0.3V to 6V
z Power Dissipation, P
D
@ T
A
= 25°C
WDFN-14L 4x3 ------------------------------------------------------------------------------------------------ 1.667W
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------- 1.333W
z Package Thermal Resistance (Note 2)
WDFN-14L 4x3, θ
JA
------------------------------------------------------------------------------------------ 60°C/W
WDFN-14L 4x3, θ
JC
------------------------------------------------------------------------------------------ 7°C/W
SOP-8 (Exposed Pad), θ
JA
--------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad), θ
JC
-------------------------------------------------------------------------------- 15°C/W
z Junction Temperature ---------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------ 260°C
z Storage Temperature Range ------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Model)--------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 4)
z Supply Input Voltage, VIN ---------------------------------------------------------------------------------- 4.5V to 21V
z Junction Temperature Range------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range ------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
Parameter Symbol Test Conditions Min Typ Max Unit
Shutdown Current I
SHDN
V
EN
= 0 -- 0 1 μA
Quiescent Current I
Q
V
EN
= 2V, V
FB
= 1V -- 0.7 -- mA
Upper Switch On Resistance R
DS(ON)1
-- 120 -- mΩ
Lower Switch On Resistance R
DS(ON)2
-- 40 -- mΩ
Switch Leakage I
LEAK
V
EN
= 0V, V
SW
= 0V or 12V -- 0 10 μA
Current Limit I
LIM
V
BOOT
− V
SW
= 4.8V 5.9 7.5 -- A
Oscillator Frequency f
SW
V
FB
= 0.75V 425 500 575 kHz
Short Circuit Frequency V
FB
= 0V -- 150 -- kHz
Maximum Duty Cycle D
MAX
V
FB
= 0.8V -- 90 -- %
Minimum On Time t
ON
-- 100 -- ns
Feedback Voltage V
FB
4.5V ≤ V
IN
≤ 21V 0.796 0.808 0.82 V
Feedback Current I
FB
-- 10 50 nA
Logic-High V
IH
2 -- 5.5
EN Voltage
Logic-Low V
IL
-- -- 0.4
V
(V
IN
= 12V, T
A
= 25°C unless otherwise specified)
RT7264A
6
DS7264A-01 September 2012www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Parameter Symbol Test Conditions Min Typ Max Unit
V
EN
= 2V -- 1 --
EN Current I
EN
V
EN
= 0V -- 0 --
μA
Logic-High V
SYNCH
1.8 -- --
SYNC Threshold
Voltage
Logic-Low V
SYNCL
-- -- 0.4
V
SYNC Frequency Range f
SYNC
0.3 -- 2 MHz
SYNC Input Current I
SYNC
V
SYNC
= 6V -- 1.5 2.5 μA
Power Good Rising Threshold -- 90 -- %
Power Good Falling Threshold -- 70 -- %
Power Good Sink Current
Capability
Sink 4mA -- -- 0.4 V
Power Good Leakage Current -- 10 -- nA
Under Voltage Lockout
Threshold
V
UVLO
V
IN
Rising 3.8 4 4.2 V
Under Voltage Lockout
Threshold Hysteresis
ΔV
UVLO
-- 400 -- mV
VCC Regulator -- 5 -- V
VCC Load Regulation I
CC
= 5mA -- 5 -- %
Soft-Start Period t
SS
C
SS
= 47nF -- 4.7 -- ms
Thermal Shutdown Threshold T
SD
-- 150 --
Thermal Shutdown Hysteresis ΔT
SD
-- 30 --
°C
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θ
JC
is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
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RT7264AZSP

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