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RT7236GCP

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
RT7235/36/39/40
4
DS7235/36/39/40-08 January 2017www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Function Block Diagram
* : VCC pin for TSSOP-14 (Exposed Pad) only. VS pin for TSSOP-14 (Exposed Pad) only.
GND pin for TSSOP-14 (Exposed Pad) only. PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.
Operation
The RT7235/36/39/40 is a synchronous step-down
converter with advanced constant on-time control mode.
Using the ACOT
TM
control mode can reduce the output
capacitance and provide fast transient response. It can
minimize the component size without additional external
compensation network.
Power Good
(for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only)
After soft-start is finished, the power good function will be
activated. When the FB is activated, the PGOOD will
become an open-drain output. If the FB is below, the
PGOOD pin will be pulled low.
Internal Regulator
The regulator provides 5V power to supply the internal
control circuit. Connecting a 1μF ceramic capacitor for
decoupling and stability is required.
Soft-Start
In order to prevent the converter output voltage from
overshooting during the startup period, the soft-start
function is necessary. The soft-start time is adjustable
and can be set by an external capacitor.
Current Protection
The inductor current is monitored via the internal switches
in cycle-by-cycle. Once the output voltage drops under
UV threshold, the device will enter latch mode for TSSOP-
14 (Exposed Pad), and hiccup mode for WDFN-10L 3x3.
UVLO Protection
To protect the chip from operating at insufficient supply
voltage, the UVLO is needed. When the input voltage of
VCC is lower than the UVLO falling threshold voltage, the
device will be latch-off.
Output Discharge Control
(for TSSOP-14 (Exposed Pad) only)
When EN pin is low, the RT7235/36 will discharge the
output with an internal 50Ω MOSFET connected between
V
OUT
to GND pin.
Thermal Shutdown
When the junction temperature exceeds the OTP
threshold value, the IC will shut down the switching
operation. Once the junction temperature cools down and
is lower than the OTP lower threshold, the converter will
automatically resume switching
VCC*
POR &
Reg
Driver
BOOT
VREG5
Control
VBIAS
On-Time
V
IN
FB
Min.
Off-Time
Ripple
Gen.
V
REF
ZC
Comparator
SS
SW
PGND
EN
VREG5
OC
+
-
-
6µA
V
REG5
UV & OV
SW
FB
VS*
VIN
Comparator
+
-
FB
0.9 x V
REF
PGOOD*
GND*
RT7235/36/39/40
5
DS7235/36/39/40-08 January 2017 www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Recommended Operating Conditions (Note 3)
Supply Voltage, VIN ----------------------------------------------------------------------------------------------- 4.5V to 18V
Junction Temperature Range------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range------------------------------------------------------------------------------------- −40°C to 85°C
Absolute Maximum Ratings (Note 1)
Supply Voltage, VIN, VCC --------------------------------------------------------------------------------------- −0.3V to 20V
Switch Voltage, SW ----------------------------------------------------------------------------------------------- −0.8V to (V
IN
+ 0.3V)
< 10ns ---------------------------------------------------------------------------------------------------------------- −5V to 25V
BOOT to SW -------------------------------------------------------------------------------------------------------- −0.3V to 6V
EN ---------------------------------------------------------------------------------------------------------------------- −0.3V to 20V
Other Pins------------------------------------------------------------------------------------------------------------ −0.3V to 6V
Power Dissipation, P
D
@ T
A
= 25°C
TSSOP-14 (Exposed Pad) --------------------------------------------------------------------------------------- 2.50W
WDFN-10L 3x3 ------------------------------------------------------------------------------------------------------ 1.67W
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------------- 2.174W
Package Thermal Resistance (Note 2)
TSSOP-14 (Exposed Pad), θ
JA
--------------------------------------------------------------------------------- 40°C/W
WDFN-10L 3x3, θ
JA
------------------------------------------------------------------------------------------------ 60°C/W
WDFN-10L 3x3, θ
JC
------------------------------------------------------------------------------------------------ 7.5°C/W
SOP-8 (Exposed Pad), θ
JA
--------------------------------------------------------------------------------------- 46°C/W
SOP-8 (Exposed Pad), θ
JC
-------------------------------------------------------------------------------------- 7°C/W
Junction Temperature Range------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------ 260°C
Storage Temperature Range ------------------------------------------------------------------------------------- −65°C to 150°C
(V
IN
= 12V, T
A
= 25°C, unless otherwise specified)
Electrical Characteristics
Parameter Symbol Test Conditions Min Typ Max Unit
Supply Current
Shutdown Current I
SHDN
V
EN
= 0V -- 1 10 A
Quiescent Current I
Q
V
EN
= 5V, V
FB
= 0.8V -- 1 1.3 mA
Logic Threshold
EN Input Voltage
Logic-High 1 1.15 1.25
V
Logic-Low 0.85 0.94 1.15
V
FB
Voltage and Discharge Resistance
Feedback Threshold Voltage V
FB
T
A
= 25C 0.757 0.765 0.773
V
T
A
= 40C to 85C 0.755 -- 0.775
Feedback Input Current I
FB
V
FB
= 0.8V -- 0.01 0.1 A
VOUT Discharge Resistance R
DIS
V
EN
= 0V, V
S
= 0.5V -- 50 100
V
REG5
Output
V
REG5
Output Voltage V
REG5
6V V
IN
18V, 0 < I
VREG5
5mA 4.8 5.1 5.4 V
RT7235/36/39/40
6
DS7235/36/39/40-08 January 2017www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Parameter Symbol Test Conditions Min Typ Max Unit
Line Regulation 6V V
IN
18V, I
VREG5
= 5mA -- -- 20 mV
Load Regulation 0 I
VREG5
5mA -- -- 100 mV
Output Current I
VREG5
V
IN
= 6V, V
REG5
= 4V, T
A
= 25C -- 70 -- mA
Oscillation Frequency f
OSC
540 650 760 kHz
R
DS(ON)
Switch On
Resistance
High-Side
R
DS(ON)_H
(V
BOOT
V
SW
) = 5.5V -- 120 --
m
Low-Side
R
DS(ON)_L
-- 35 --
Current Limit
Current Limit I
LIM
5.9 6.85 7.8 A
Thermal Shutdown
Thermal Shutdown Threshold T
SD
Shutdown Temperature -- 150 --
C
Thermal Shutdown Hysteresis T
SD
-- 20 --
On-Time Timer Control
On-Time t
ON
V
IN
= 12V, V
OUT
= 1.05V -- 135 -- ns
Minimum On-Time t
ON(MIN)
Note 5 -- 55 80 ns
Minimum Off-Time t
OFF(MIN)
V
FB
= 0.7V -- 260 310 ns
Soft-Start
SS Charge Current V
SS
= 0V -- 6 -- A
SS Discharge Current V
SS
= 0.5V 0.1 0.2 -- mA
UVLO
UVLO Threshold Wake Up V
REG5
3.6 3.85 4.1
V
Hysteresis 0.16 0.35 0.47
Power Good
PGOOD Threshold
V
FB
Rising
85 90 95
%
V
FB
Falling
-- 85 --
PGOOD Sink Current
PGOOD = 0.5V
2.5 5 -- mA
Output Under Voltage and Over Voltage Protection
OVP Trip Threshold OVP Detect
115 120 125 %
OVP Prop Delay
-- 5 --
s
UVP Trip Threshold
65 70 75
%
UVP Hysteresis
-- 10 --
UVP Prop Delay
-- 250 --
s
UVP Enable Delay t
UVPEN
Relative to Soft-Start Time
--
t
SS
x 1.7
-- ms
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

RT7236GCP

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IC REG BUCK ADJ 5A 14TSSOP
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