DS6550A Datasheet, PDF (5/16 Pages) Richtek Technology Corporation – Synchronous DC-DC Step-Down Controller with 5V LDO

RT6550A
Electrical Characteristics
(VIN = 12V, V_EN = 3.3V, VCS = 2V, No Load, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Input Supply
VIN Power On Reset
VIN_POR
Rising Threshold
Falling Threshold
VIN Shutdown Supply
Current
VIN Quiescent Current
IVIN_SBY
IVIN
Buck Controller Off, VEN = GND
UGATE / LGATE Floating,
VIN = 12V, No Switching
Buck Controllers Output and FB Voltage
FB Valley Trip Voltage
VO_DIS Discharge
Current
PHASE Discharge
Current
VFB
IDCHG
IDCHG_LX
CCM Operation
VVO_DIS = 0.5V
VPHASE = 0.5V
Switching Frequency
Switching Frequency
Minimum Off-Time
fSW
tOFF(MIN)
VIN = 12V, VOUT = 5V
VFB = 1.9V
Soft-Start
Soft-Start Time
tSS
VOUT Ramp-up Time
Current Sense
CS Source Current
CS Current Temperature
Coefficient
ICS
TCICS
VCS = 1V
In Comparison with 25°C
Internal Regulator
LDO5 Output Voltage
VLDO5
LDO5 Output Current
ILDO5
VIN = 12V, No Load
VIN > 7V, ILDO5 < 100mA
VIN > 5.5V, ILDO5 < 35mA
VIN > 5V, ILDO5 < 20mA
VLDO5 = 4.5V, VIN = 7.4V
UVLO
LDO5 UVLO Threshold
VUVLO5
Rising Edge
Falling Edge
Fault Detection
OVP Trip Threshold
OVP Propagation Delay
UVP Trip Threshold
UVP Shutdown Blanking
Time
VOVP
VUVP
tSHDN_UVP
FB with Respect to Internal Reference
UVP Detect, FB Falling Edge
From EN Enable
Min
--
3.2
--
--
1.98
10
5
240
--
--
9
--
4.9
4.8
4.8
4.5
100
--
3.7
109
--
47
--
Typ
4.6
3.7
20
420
2
45
8
300
200
0.9
10
4700
5
5
5
4.75
175
4.3
3.9
113
1
52
1.3
Max Unit
4.9
V
--
35
A
750 A
2.02 V
--
mA
--
mA
360 kHz
275 ns
--
ms
11
A
-- ppm/C
5.1
5.1
V
5.1
5.1
--
mA
4.6
V
4.1
117
%
--
s
57
%
--
ms
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS6550A-00 September 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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