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RT7232 Datasheet(PDF) 6 Page - Richtek Technology Corporation

Part # RT7232
Description  4A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter
PDF  18 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT7232 Datasheet(HTML) 6 Page - Richtek Technology Corporation

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RT7231/32/33/34
6
DS7231/32/33/34-00
March 2013
www.richtek.com
©
Copyright
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
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.
θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC 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.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Line Regulation
6V
≤ VIN ≤ 18V, IVREG5 = 5mA
--
--
20
mV
Load Regulation
0
< IVREG5 < 5mA
--
--
100
mV
Output Current
IVREG5
VIN = 6V, VREG5 = 4V
--
70
--
mA
RDS(ON)
High-Side
RDS(ON)_H
(VBOOT − VSW) = 5.5V
--
120
--
Switch On
Resistance
Low-Side
RDS(ON)_L
--
50
--
m
Ω
Current Limit
Current Limit
ILIM
4.7
5.4
7.5
A
Thermal Shutdown
Thermal Shutdown Threshold
TSD
Shutdown Temperature
--
150
--
Thermal Shutdown Hysteresis
ΔTSD
--
20
--
°C
On-Time Timer Control
On-Time
tON
VIN = 12V, VOUT = 1.05V
--
135
--
ns
Minimum Off-Time
tOFF(MIN)
VFB = 0.7V
--
260
310
ns
Soft-Start
SS Charge Current
VSS = 0V
--
6
--
μA
SS Discharge Current
VSS = 0.5V
0.1
0.2
--
mA
UVLO
UVLO Threshold
Wake Up VREG5
3.6
3.85
4.1
Hysteresis
0.16
0.35
0.47
V
Power Good
VFB Rising
85
90
95
PGOOD Threshold
VFB 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
--
μs
UVP Trip Threshold
65
70
75
UVP Hysteresis
--
10
--
%
UVP Prop Delay
--
250
--
μs
UVP Enable Delay
tUVPEN
Relative to Soft-Start Time
--
tSS
x 1.7
--
ms



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