®
RT5041AB
Multi-Output Integrated Chip (MOIC)
for Intel Braswell Platform
General Description
Features
RT5041AB integrates 2 buck converters, 3 LDOs and 2
power switches in one package. This MOIC is designed
for Braswell M/D SOC. Braswell M/D SOC controls the
power sequence by simple I/O. RT5041AB has UVLO,
OVP, UVP, OTP and current limit protections. RT5041AB
is available in WQFN-28L 4x4 package.
Ordering Information
RT5041AB
Package Type
QW : WQFN-28L 4x4 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Applications
Richtek products are :
2 Channels Low Power Consumption Step-Down
DC/DC Converters
Low On-Resistance for DC/DC Converters
50mΩ
Ω of High Side MOSFET
45mΩ
Ω of Low Side MOSFET
3 Channels LDO Voltage Regulators
2 Channels Switches
Input Voltage Range : 2.7V to 5.5V
Internal Soft-Start and Soft-Discharge
Cycle-by-Cycle Current Limit and UVP
Thermal Shutdown
Ultra book and Tablet Computers
RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
RT5041AB
V1P8
IN_1P24A
IN_1P8
VIN
V1P8
IN_1P15A
V1P24A
IN_1P5S
O_1P24A
LX_1P8
V1P15A
O_1P15A
IN_1P05A
VIN
V1P5S
O_1P5S
LX_1P05A
V1P05A
O_1P8
V1P8
SWIN_1P8A
V1P8A
SWO_1P8A
O_1P05A
VCC
EN_1P05A
SLP_S0iX_B
SUSPWRDNACK
SLP_S3_B
V3P3
IN_3P3A
V3P3A
O_3P3A
GND
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
RSMRST
PGND
VCC
V1P05A Enable
S0iX
SUSPWRDNACK
S3
PG for V3P3A
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
RT5041AB
Pin Configurations
Marking Information
(TOP VIEW)
LX_1P8
LX_1P8
EN_1P05A
SLP_S0iX_B
SUSPWRDNACK
LX_1P05A
LX_1P05A
3D= : Product Code
YMDNN : Date Code
3D=YM
DNN
28 27 26 25 24 23 22
IN_1P8
IN_1P8
O_1P8
SLP_S3_B
O_1P24A
O_1P15A
IN_1P24A
1
2
3
4
5
6
7
PGND
29
21
20
19
18
17
16
15
IN_1P05A
IN_1P05A
O_1P05A
O_3P3A
IN_3P3A
SWO_1P8A
PGND
IN_1P15A
IN_1P5S
O_1P5S
VCC
GND
RSMRST
SWIN_1P8A
8 9 10 11 12 13 14
WQFN-28L 4x4
Functional Pin Description
Pin No.
Pin Name
Pin Function
1, 2
IN_1P8
Input Voltage for V1P8 Buck Converter.
3
O_1P8
Output Voltage Feedback of V1P8 Buck Converter.
4
SLP_S3_B
Enable Signal for V1P5S LDO.
5
O_1P24A
LDO Output for V1P24A.
6
O_1P15A
LDO Output for V1P15A.
7
IN_1P24A
LDO Input for V1P24A.
8
IN_1P15A
LDO Input for V1P15A.
9
IN_1P5S
LDO Input for V1P5S.
10
O_1P5S
LDO Output for V1P5S.
11
VCC
Analog Power for Internal Circuit.
12
GND
Analog Ground.
13
RSMRST
Power Good Signal for V3P3A Switch.
14
SWIN_1P8A
Switch Input for V1P8A.
15,
PGND
29 (Exposed Pad)
Power Ground. The Exposed Pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
16
SWO_1P8A
Switch Output for V1P8A.
17
IN_3P3A
Switch Input for V3P3A.
18
O_3P3A
Switch Output for V3P3A.
19
O_1P05A
Output Voltage Feedback for V1P05A Buck Converter.
20, 21
IN_1P05A
Input Voltage for V1P05A Buck Converter.
22, 23
LX_1P05A
Phase Node for V1P05A Buck Converter.
SUSPWRDNACK
Disable Signal for All Power Rails.
24
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
Pin No.
Pin Name
Pin Function
25
SLP_S0iX_B
Input Pin. LDO_V1P15A will recognize this first rising edge during power
up sequence to achieve SLP_S0iX_B function.
When SLP_S0iX_B = High, LDO_V1P15A_VOUT = 1.15V.
When SLP_S0iX_B = Low, LDO_V1P15A_VOUT = 0.75V.
26
EN_1P05A
Enable Signal for RT5041AB. Start to power up all voltage rails with a
sequence.
LX_1P8
Phase Node for V1P8 Buck Converter.
27, 28
Function Block Diagram
VCC
IN_1P05A
V1P05A + VNN
LX_1P05A
V1P8
PG_V1P05A
PG_V1P8A
IN_1P8
LX_1P8
PGND
PGND
O_1P05A
O_1P8
EN_1P05A
IN_1P24A
LDO
V1P24A
SW
V3P3A
PG_V1P24A
IN_3P3A
PG_V3P3A_S
O_1P24A
O_3P3A
IN_1P15A
LDO
V1P15A
RSMRST
PG_V1P15A
SW
V1P8A
O_1P15A
SLP_S0iX_B
IN_1P5S
SWIN_1P8A
PG_V1P8A_S
LDO
V1P5S
SWO_1P8A
PG_V1P5S
O_1P5S
SLP_S3_B
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
SUSPWRDNACK
GND
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3
RT5041AB
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage, IN_1P8, IN_1P05A, IN_3P3A ---------------------------------------------------------Supply Input Voltage, IN_1P24A, IN_1P15A, IN_V1P5S, IN_V1P8A ------------------------------------Supply Voltage, VCC ------------------------------------------------------------------------------------------------Switch Node Voltage, LX_V1P05A, LX_V1P8 -----------------------------------------------------------------Other Pins --------------------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C
WQFN-28L 4x4 -------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2)
WQFN-28L 4x4, θJA --------------------------------------------------------------------------------------------------WQFN-28L 4x4, θJC -------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------Junction Temperature ------------------------------------------------------------------------------------------------Storage Temperature Range ---------------------------------------------------------------------------------------ESD Susceptibility (Note 3)
HBM (Human Body Model) ------------------------------------------------------------------------------------------
Recommended Operating Conditions
−0.3V to 6V
−0.3V to 6V
−0.3V to 6V
−0.3V to 6V
−0.3V to 6V
3.5W
28.5°C/W
7°C/W
260°C
150°C
−65°C to 150°C
2kV
(Note 4)
Supply Input Voltage, IN_1P05A, IN_1P8 ----------------------------------------------------------------------Supply Input Voltage, IN_1P24A, IN_1P15A, IN_1P5S -----------------------------------------------------Supply Input Voltage, IN_3P3A -----------------------------------------------------------------------------------Supply Input Voltage, SWIN_1P8A ------------------------------------------------------------------------------Supply Voltage, VCC ------------------------------------------------------------------------------------------------Ambient Temperature Range ---------------------------------------------------------------------------------------Junction Temperature Range ----------------------------------------------------------------------------------------
2.7V to 5.5V
1.8V to 2V
3.3V to (VCC − 2)V
1.8V to (VCC − 2)V
4.5V to 5.5V
−40°C to 85°C
−40°C to 125°C
Electrical Characteristics
(VCC = 5V, TA = 25°C, No load, for every voltage rails unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
4.5
--
5.5
V
--
--
5
A
MOIC
Supply Voltage
VCC
Shutdown Current
ISHDN
UVLO Threshold
VUVLO
--
--
4
V
UVLO Hysteresis
VUVLO_HYS
--
150
--
mV
Enable Input High Voltage
VEN_H
Measured VEN_1P05A,
VSUSPWRDNACK, VSLP_S3_B,
VSLP_S0iX_B
1
--
VCC
V
Enable Input Low Voltage
VEN_L
Measured VEN_1P05A,
VSUSPWRDNACK, VSLP_S3_B,
VSLP_S0iX_B
--
--
0.4
V
Thermal Shutdown Threshold
TSD
--
150
--
°C
Thermal Shutdown
Hysteresis
TSD_HYS
--
25
--
°C
VEN_1P05A = 0V
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
2.7
--
5.5
V
0
20
55
A
CONVERTER_V1P8 (4.1A)
Supply Voltage
VIN
Supply Quiescent Current
IQ
Enabled, no switching.
Output Voltage
VOUT
CCM
1.799
1.818
1.836
V
Soft-Start Time
TSS
10% to 90% VOUT
0.58
0.9
1.35
ms
Switch On Resistance
RDS(ON),H
VIN = 5V
30
50
85
m
Switch On Resistance
RDS(ON),L
VIN = 5V
30
45
75
m
Current Limit
IOC
Inductor valley current
4.7
6
8.8
A
Switching Frequency
f SW
1
1.2
1.4
MHz
Minimum Off Time
TOFF
--
120
--
ns
OVP Trip Threshold
VOVP
115
120
125
%
--
5
--
s
55
60
65
%
--
5
--
s
--
1
--
2.7
--
5.5
V
0
20
55
A
OVP Deglitch Time
(Note 5)
UVP Trip Threshold
UVP Deglitch Time
TOVD
VUVP
(Note 5)
Discharge Resistance
OVP detected
UVP detected
TUVD
RDIS
EN = Low, VTEST = 1V
CONVERTER_V1P05A (4.6A)
Supply Voltage
VIN
Supply Quiescent Current
IQ
Enabled, no switching.
Output Voltage
VOUT
CCM
1.039
1.05
1.06
V
Soft-Start Time
TSS
10% to 90% VOUT
0.58
0.9
1.35
ms
Switch On Resistance
RDS(ON),H
VIN = 5V
30
50
85
m
Switch On Resistance
RDS(ON),L
VIN = 5V
30
45
75
m
Current Limit
IOC
Inductor valley current
5.2
6
8.8
A
Switching Frequency
f SW
1
1.2
1.4
MHz
Minimum Off Time
TOFF
--
120
--
ns
OVP Trip Threshold
VOVP
115
120
125
%
--
5
--
s
55
60
65
%
--
5
--
s
--
1.8
--
1.6
--
2
V
0
20
50
A
OVP Deglitch Time
(Note 5)
UVP Trip Threshold
UVP Deglitch Time
TOVD
VUVP
(Note 5)
Discharge Resistance
OVP detected
UVP detected
TUVD
RDIS
EN = Low, VTEST = 1V
LDO_V1P24A (1A)
Supply Voltage
VIN
Supply Current (Quiescent)
IQ
Enabled
Output Voltage
VOUT
VIN = 1.8V
1.227
1.24
1.252
V
Soft-Start Time
TSS
10% to 90% VOUT
0.33
0.5
0.67
ms
Dropout Voltage
VDROP
IOUT = 0.9A
20
200
300
mV
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
RT5041AB
Parameter
Symbol
Current Limit
IOC
UVP Trip Threshold
VUVP
UVP Deglitch Time
(Note 5)
Discharge Resistance
Test Conditions
Min
Typ
1.1
1.5
55
60
65
%
--
5
--
s
EN = Low, VTEST = 1V
--
6
--
IOUT = 100mA, f = 100Hz
--
60
--
IOUT = 100mA, f = 10kHz
--
30
--
1.6
--
2
V
0
20
50
A
VIN = 1.8V, VSLP_S0iX_B = 1
1.138
1.15
1.161
VIN = 1.8V, VSLP_S0iX_B = 0
0.735
0.75
0.765
10% to 90% VOUT
0.33
0.5
0.67
ms
Ramp up from 0.75V to
1.15V
--
42
--
V/ms
IOUT = 1A
20
400
500
mV
1.1
1.5
2.05
A
55
60
65
%
--
5
--
s
EN = Low, VTEST = 1V
--
6
--
IOUT = 100mA, f = 100Hz
--
60
--
IOUT = 100mA, f = 10kHz
--
30
--
1.6
--
2
V
0
20
50
A
UVP detected
TUVD
RDIS
Power Supply Rejection Rate
Max
Unit
A
dB
LDO_V1P15A (1A)
Supply Voltage
VIN
Supply Quiescent Current
IQ
Output Voltage
VOUT
Soft-Start Time
TSS
Slew Rate
Dropout Voltage
VDROP
Current Limit
IOC
UVP Trip Threshold
VUVP
UVP Deglitch Time
(Note 5)
Discharge Resistance
Enabled
UVP detected
TUVD
RDIS
Power Supply Rejection Rate
V
dB
LDO_V1P5S (0.1A)
Supply Voltage
VIN
Supply Quiescent Current
IQ
Enabled
Output Voltage
VOUT
VIN = 1.8V
1.485
1.5
1.515
V
Soft-Start Time
TSS
10% to 90% VOUT
0.33
0.5
0.67
ms
Dropout Voltage
VDROP
IOUT = 100mA
5
20
100
mV
Current Limit
IOC
0.15
0.2
0.55
A
UVP Trip Threshold
VUVP
55
60
65
%
--
5
--
s
EN = Low, VTEST = 1V
--
6
--
IOUT = 100mA, f = 100Hz
--
60
--
IOUT = 100mA, f = 10kHz
--
30
--
UVP Deglitch Time
(Note 5)
Discharge Resistance
Power Supply Rejection Rate
UVP detected
TUVD
RDIS
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
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dB
is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
2.7
3.3
VCC 2
V
SW_V3P3A (450mA)
Supply Voltage
VIN
Supply Quiescent Current
IQ
VEN_1P05A = 2V
0
5
25
A
On-state Resistance
RDS(ON)
VIN = 3.333V, IOUT = 100mA
--
90
--
m
Soft-Start Time
TSS
10% to 90% VOUT
40
300
510
s
Dropout Voltage
VDROP
IOUT = 400mA
--
33
--
mV
Current Limit
IOC
0.55
1
2.6
A
UVP Trip Threshold
VUVP
--
60
--
%
--
5
--
s
--
6
25
1.6
1.8
VCC 2
V
UVP Deglitch Time
(Note 5)
Discharge Resistance
UVP detected
TUVD
RDIS
EN = Low, VTEST = 1V
SW_V1P8A (1A)
Supply Voltage
VIN
Supply Current (Quiescent)
IQC
VEN_1P05A = 2V
0
5
25
A
On-state Resistance
RDS(ON)
VIN = 1.818V, IOUT = 100mA
--
60
--
m
Soft-Start Time
TSS
10% to 90% VOUT
40
300
455
s
Dropout Voltage
VDROP
IOUT = 300mA
--
18
--
mV
Current Limit
IOC
1.1
1.4
2.6
A
UVP Trip Threshold
VUVP
--
60
--
%
--
5
--
s
--
6
--
UVP Deglitch Time
(Note 5)
Discharge Resistance
UVP detected
TUVD
RDIS
EN = Low, VTEST = 1V
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.
Note 5. Guaranteed by design.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
is a registered trademark of Richtek Technology Corporation.
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7
RT5041AB
Typical Application Circuit
V1P8
7
10µF x 3
8
9
5
V1P24A
RT5041AB
IN_1P24A
1, 2
IN_1P5S
O_1P24A
6 O_1P15A
22µF
LX_1P8
O_1P8
IN_1P05A
27, 28
LX_1P05A
14 SWIN_1P8A
2.2µF
16
V1P8A
2.2µF
V3P3
2.2µF
V3P3A
2.2µF
V1P8
22µF x 4 * Optional 1
4.7R
20, 21
VIN
10µF x 3
4.7µF
V1P8
1µH
3
10 O_1P5S
V1P5S
VIN
10µF x 3
IN_1P15A
22µF
V1P15A
IN_1P8
O_1P05A
VCC
22, 23
0.47µH
V1P05A
22µF x 7 ** Optional 2
19
11
VCC
1µF
SWO_1P8A
26
EN_1P05A
25
17 IN_3P3A
SLP_S0iX_B
24
SUSPWRDNACK
4
SLP_S3_B
18
O_3P3A
13
RSMRST
GND
12
V1P05A Enable
S0iX
SUSPWRDNACK
10k
S3
PG for V3P3A
PGND
15, 29 (Exposed Pad)
* For Intel transient test condition, Loading = 2.6A to 4.1A, SR = 1.5A/µs.
** For Intel transient test condition, Loading = 2.35A to 4.6A, SR = 2.25A/µs.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
Typical Operating Characteristics
Power On from EN_1P05A
Power On from EN_1P05A
EN_1P05A
(5V/Div)
EN_1P05A
(5V/Div)
V1P8
(1V/Div)
V1P24A
(1V/Div)
V1P05A
(1V/Div)
V1P15A
(1V/Div)
V1P8A
(1V/Div)
Time (2ms/Div)
Time (2ms/Div)
Power On from EN_1P05A
Power On from V1P5S
EN_1P05A
(5V/Div)
EN_1P05A
(5V/Div)
SLP_S3_B
(5V/Div)
V3P3A
(2V/Div)
RSMRST
(5V/Div)
VIN = 5V, VCC = 5V,
SUSPWRDNACK Low, No Load
VIN = 5V, VCC = 5V,
SUSPWRDNACK Low, No Load
VIN = 5V, VCC = 5V,
SUSPWRDNACK Low, No Load
V1P5S
(1V/Div)
VIN = 5V, VCC = 5V,
SUSPWRDNACK Low, No Load
Time (2ms/Div)
Time (1ms/Div)
Power Off EN_1P05A
Power Off EN_1P05A
EN_1P05A
(5V/Div)
EN_1P05A
(5V/Div)
V1P05A
(1V/Div)
V1P24A
(1V/Div)
V1P5S
(1V/Div)
V1P8
(1V/Div)
V1P15A
(1V/Div) VIN = 5V, VCC = 5V, SUSPWRDNACK Low, No Load
Time (500μs/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
V1P8A
(1V/Div) V = 5V, V = 5V, SUSPWRDNACK Low, No Load
IN
CC
Time (500μs/Div)
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RT5041AB
Power Off EN_1P05A
Power On from SUSPWRNACK
EN_1P05A
(5V/Div)
SUSPWRNACK
(5V/Div)
V3P3A
(2V/Div)
V1P05A
(1V/Div)
V1P8
(1V/Div)
RSMRST
(5V/Div)
VIN = 5V, VCC = 5V, SUSPWRDNACK Low, No Load
V1P15A
(1V/Div)
Time (500μs/Div)
Time (2ms/Div)
Power On from SUSPWRNACK
Power On from SUSPWRNACK
SUSPWRNACK
(5V/Div)
SUSPWRNACK
(5V/Div)
V1P24A
(1V/Div)
V3P3A
(2V/Div)
V1P8A
(1V/Div)
VIN = 5V, VCC = 5V, EN_1P05A High, No Load
RSMRST
(5V/Div)
Time (2ms/Div)
Power Off SUSPWRNACK
Power Off SUSPWRNACK
SUSPWRNACK
(5V/Div)
V1P05A
(1V/Div)
V1P24A
(1V/Div)
V1P5S
(1V/Div)
V1P8
(1V/Div)
VIN = 5V, VCC = 5V, EN_1P05A High, No Load
Time (500μs/Div)
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VIN = 5V, VCC = 5V, EN_1P05A High, No Load
Time (2ms/Div)
SUSPWRNACK
(5V/Div)
V1P15A
(1V/Div)
VIN = 5V, VCC = 5V, EN_1P05A High, No Load
V1P8A
(1V/Div)
VIN = 5V, VCC = 5V, EN_1P05A High, No Load
Time (500μs/Div)
is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
Power Off SUSPWRNACK
SUSPWRNACK
(5V/Div)
S0iX Enter Sequence
SLP_S0iX_B
(5V/Div)
V1P15A
(1V/Div)
V3P3A
(2V/Div)
SLP_S3_B
(5V/Div)
RSMRST
(5V/Div)
V1P5S
(1V/Div)
VIN = 5V, VCC = 5V, EN_1P05A High, No Load
Time (500μs/Div)
Time (500μs/Div)
S0iX Exit Sequence
S3 (S4/S5) Enter Sequence
SLP_S0iX_B
(5V/Div)
SLP_S0iX_B
(5V/Div)
V1P15A
(1V/Div)
V1P15A
(1V/Div)
SLP_S3_B
(5V/Div)
SLP_S3_B
(5V/Div)
V1P5S
(1V/Div)
VIN = 5V, VCC = 5V, V1P15A Load 1mA
VIN = 5V, VCC = 5V, V1P15A Load 1mA
V1P5S
(1V/Div)
VIN = 5V, VCC = 5V, V1P15A Load 1mA
Time (500μs/Div)
Time (500μs/Div)
S3 (S4/S5) Exit Sequence
Shutdown Current vs. VCC
1.0
VIN = 5V, EN_1P05A = 0V
0.9
Shutdown Current (μA)1
SLP_S0iX_B
(5V/Div)
V1P15A
(1V/Div)
SLP_S3_B
(5V/Div)
V1P5S
(1V/Div)
VIN = 5V, VCC = 5V, V1P15A Load 1mA
Time (500μs/Div)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
4.5
4.7
4.9
5.1
5.3
5.5
VCC (V)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
is a registered trademark of Richtek Technology Corporation.
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11
RT5041AB
Input High/Low Voltage vs. Temperature
Quiescent Current vs. VCC
143
1.0
Input High/Low Voltage (V)
Quiescent Current (μA)
142
141
140
139
138
137
EN_1P05A
Rising
0.8
Falling
0.6
0.4
0.2
VIN = 5V, EN_1P05A = 2V
VIN = 5V, VCC = 5V
136
0.0
4.5
4.7
4.9
5.1
5.3
5.5
-50
-25
0
VCC (V)
0.8
Falling
0.6
0.4
0.2
SLP_S3_B
0.8
Falling
0.6
0.4
0.2
25
50
75
100
125
-50
-25
0
25
50
75
100
Temperature (°C)
Temperature (°C)
Input High/Low Voltage vs. Temperature
V1P05A Load Transient Response
1.0
Input High/Low Voltage (V)
VIN = 5V, VCC = 5V
0.0
0
125
Rising
VIN = 5V, VCC = 5V
0.0
-25
100
Input High/Low Voltage vs. Temperature
SUSPWRDNACK
Rising
-50
75
1.0
Input High/Low Voltage (V)
Input High/Low Voltage (V)
50
Temperature (°C)
Input High/Low Voltage vs. Temperature
1.0
25
SLP_S0iX_B
125
Converter
Rising
0.8
IOUT
(1A/Div)
Falling
0.6
VOUT
(20mV/Div)
0.4
0.2
VIN = 5V, VCC = 5V
VIN = 5V, VCC = 5V,
ILOAD = 1A to 1.9A, SR = 0.9A/μs,
COUT = 22μF/0603/6.3V x 3
LX
(5V/Div)
0.0
-50
-25
0
25
50
75
100
125
Time (10μs/Div)
Temperature (°C)
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is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
V1P05A Load Transient Response
V1P05A Load Transient Response
Converter
Converter
IOUT
(1A/Div)
IOUT
(2A/Div)
VOUT
(20mV/Div)
VOUT
(20mV/Div)
VIN = 3.3V, VCC = 5V,
ILOAD = 1A to 1.9A, SR = 0.9A/μs,
COUT = 22μF/0603/6.3V x 3
LX
(5V/Div)
LX
(5V/Div)
IOUT
(2A/Div)
VOUT
(20mV/Div)
VIN = 5V, VCC = 5V,
ILOAD = 2.85A to 4.6A,
SR = 1.75A/μs,
COUT = 22μF/0603/6.3V x 5
Time (10μs/Div)
Time (10μs/Div)
V1P05A Load Transient Response
V1P05A Load Transient Response
Converter
Converter
VIN = 3.3V, VCC = 5V,
ILOAD = 2.85A to 4.6A,
SR = 1.75A/μs,
COUT = 22μF/0603/6.3V x 5
IOUT
(2A/Div)
VOUT
(20mV/Div)
LX
(5V/Div)
VIN = 5V, VCC = 5V,
ILOAD = 2.35A to 4.6A,
SR = 2.25A/μs,
COUT = 22μF/0603/6.3V x 6
LX
(5V/Div)
Time (10μs/Div)
Time (10μs/Div)
V1P05A Load Transient Response
V1P8 Load Transient Response
Converter
IOUT
(2A/Div)
VOUT
(20mV/Div)
VIN = 3.3V, VCC = 5V
ILOAD = 2.35A to 4.6A,
SR = 2.25A/μs,
COUT = 22μF/0603/6.3V x 7
Converter
IOUT
(1A/Div)
VOUT
(20mV/Div)
VIN = 5V, VCC = 5V,
ILOAD = 0.6A to 1.717A
SR = 1.117A/μs,
COUT = 22μF/0603/6.3V x 3
LX
(5V/Div)
LX
(5V/Div)
Time (10μs/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
Time (10μs/Div)
is a registered trademark of Richtek Technology Corporation.
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13
RT5041AB
V1P8 Load Transient Response
V1P8 Load Transient Response
Converter
Converter
VIN = 3.3V, VCC = 5V,
ILOAD = 0.6A to 1.717A
IOUT
(1A/Div)
VOUT
(20mV/Div)
SR = 1.117A/μs,
COUT = 22μF/0603/6.3V x 3
LX
(5V/Div)
IOUT
(2A/Div)
VOUT
(20mV/Div)
LX
(5V/Div)
Time (10μs/Div)
Time (10μs/Div)
V1P8 Load Transient Response
V1P8 Load Transient Response
Converter
Converter
IOUT
(2A/Div)
VOUT
(20mV/Div)
VIN = 5V, VCC = 5V,
ILOAD = 3.65A to 4.1A,
SR = 0.45A/μs,
COUT = 22μF/0603/6.3V x 3
VIN = 3.3V, VCC = 5V,
ILOAD = 3.65A to 4.1A
SR = 0.45A/μs,
COUT = 22μF/0603/6.3V x 3
VIN = 5V, VCC = 5V,
IOUT
(2A/Div)
VOUT
(20mV/Div)
ILOAD = 2.6A to 4.1A,
SR = 1.5A/μs,
COUT = 22μF/0603/6.3V x 3
LX
(5V/Div)
LX
(5V/Div)
Time (10μs/Div)
Time (10μs/Div)
V1P8 Load Transient Response
V1P05A OVP
Converter
VIN = 3.3V, VCC = 5V,
IOUT
(2A/Div)
VOUT
(20mV/Div)
ILOAD = 2.6A to 4.1A
SR = 1.5A/μs,
COUT = 22μF/0603/6.3V x 4
LX
(10V/Div)
VOUT
(500mV/Div)
LX
(5V/Div)
VIN = 5V, VCC = 5V, Load = 2A
Time (10μs/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
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Converter
RSMRST
(5V/Div)
Time (50μs/Div)
is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
V1P05A UVP
V1P8 OVP
Converter
RSMRST
(5V/Div)
Converter
RSMRST
(5V/Div)
LX
(10V/Div)
LX
(10V/Div)
VOUT
1V/Div)
VOUT
(500mV/Div)
VIN = 5V, VCC = 5V
VIN = 5V, VCC = 5V, Load = 2A
Time (50μs/Div)
Time (10μs/Div)
V1P8 UVP
V1P05A OCP
Converter
RSMRST
(5V/Div)
LX
(10V/Div)
Converter
RSMRST
(5V/Div)
LX
(10V/Div)
VOUT
(1V/Div)
VOUT
1V/Div)
VIN = 5V, VCC = 5V
IL
(5A/Div)
VIN = 5V, VCC = 5V
Time (10μs/Div)
Time (10μs/Div)
Output Voltage vs. Load Current
V1P18 OCP
1.060
Converter
VOUT
(1V/Div)
Converter V1P05A
1.058
Output Voltage (V)
RSMRST
(5V/Div)
LX
(10V/Div)
1.056
1.054
1.052
1.050
VIN = 5V
VIN = 3.3V
1.048
1.046
1.044
IL
(5A/Div)
VIN = 5V, VCC = 5V
1.042
VCC = 5V
1.040
Time (10μs/Div)
0
1
2
3
4
5
Load Current (A)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
is a registered trademark of Richtek Technology Corporation.
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15
RT5041AB
Output Voltage vs. Load Current
1.830
Switch Frequency vs. Load Current
1160
Converter V1P8
Switch Frequency (kHz)1
Output Voltage (V)
1.825
1.820
VIN = 5V
VIN = 3.3V
1.815
1.810
1.805
Converter V1P05A
1140
VIN = 3.3V
1120
VIN = 5V
1100
1080
1060
1040
1020
VCC = 5V
1.800
VCC = 5V
1000
0
1
2
3
4
5
1
2
Load Current (A)
Switch Frequency vs. Load Current
1160
Converter V1P05A
90
VIN = 3.3V
85
1120
VIN = 5V
Efficiency (%)
Switch Frequency (kHz)1
5
Efficiency vs. Load Current
1140
1100
1080
1060
1040
VIN = 5V
80
75
70
65
60
1020
55
VCC = 5V
1000
VCC = 5V
50
1
2
3
4
90
1
2
3
4
Load Current (A)
Efficiency vs. Load Current
V1P15A Load Transient Response
Converter V1P8
VIN = 3.3V
95
0
5
Load Current (A)
100
Efficiency (%)
4
95
Converter V1P8
VIN = 3.3V
3
Load Current (A)
5
LDO
VIN = 5V
IOUT
(1A/Div)
85
80
VOUT
(20mV/Div)
75
70
VIN = V1P8, VCC = 5V,
ILOAD = 0.5A to 1A, SR = 0.5A/μs,
COUT = 22μF x 1
65
VCC = 5V
60
0
1
2
3
4
5
Time (10μs/Div)
Load Current (A)
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is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
V1P24A Load Transient Response
V1P5S Load Transient Response
LDO
LDO
IOUT
(100mA/Div)
IOUT
(1A/Div)
VOUT
(20mV/Div)
VOUT
(10mV/Div)
VIN = V1P8, VCC = 5V,
ILOAD = 0.5A to 1A, SR = 0.5A/μs,
COUT = 22μF x 1
VIN = V1P8, VCC = 5V, SLP_S3_B = High,
ILOAD = 83mA to 100mA, SR = 17mA/μs,
COUT = 4.7μF x 1
Time (10μs/Div)
Time (10μs/Div)
Output Voltage vs. Load Current
Output Voltage vs. Load Current
0.752
LDO V1P15A
1.149
LDO V1P15A
0.750
Output Voltage (V)
Output Voltage (V)
1.153
1.145
1.141
1.137
0.748
0.746
0.744
VIN = V1P8, VCC = 5V,
SLP_S0iX_B = High
VIN = V1P8, VCC = 5V,
SLP_S0iX_B = Low
1.133
0.742
0
200
400
600
800
1000
0
100
Load Current (mA)
LDO V1P24A
Output Voltage (V)
1.236
1.232
1.228
500
LDO V1P5S
1.4990
1.4985
1.4980
1.4975
1.224
VIN = V1P8, VCC = 5V,
SLP_S3_B = High
VIN = V1P8, VCC = 5V
1.220
1.4970
0
200
400
600
800
Load Current (mA)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
400
Output Voltage vs. Load Current
1.4995
1.240
Output Voltage (V)
300
Load Current (mA)
Output Voltage vs. Load Current
1.244
200
September 2015
1000
0
10
20
30
40
50
60
70
80
90 100
Load Current (mA)
is a registered trademark of Richtek Technology Corporation.
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RT5041AB
Output Voltage vs. Temperature
1.16
Output Voltage vs. Temperature
0.76
LDO V1P15A
0.75
Output Voltage (V)
Output Voltage (V)
1.15
LDO V1P15A
0mA
100mA
500mA
1000mA
1.14
1.13
1.12
1.11
-50
-40
-20
0
25
50
75
100
0.73
0.72
0.71
VIN = V1P8, VCC = 5V, SLP_S0iX_B = High
Temperature from −40°C to 125°C
1.10
0mA
100mA
500mA
0.74
VIN = V1P8, VCC = 5V, SLP_S0iX_B = Low
Temperature from −40°C to 125°C
0.70
125
-50
-40
-20
Temperature (°C)
Output Voltage vs. Temperature
1.26
25
50
75
100
125
Output Voltage vs. Temperature
1.52
LDO V1P24A
1.25
LDO V1P5S
1.50
Output Voltage (V)
Output Voltage (V)
0
Temperature (°C)
1.24
1.23
0mA
100mA
500mA
1000mA
1.22
0mA
10mA
50mA
100mA
1.48
1.46
1.44
1.21
VIN = V1P8, VCC = 5V,
Temperature from −40°C to 125°C
1.20
-50
-40
-20
0
25
50
75
100
1.42
-50
125
-40
-20
0
25
50
Temperature (°C)
Temperature (°C)
V1P15A UVP
V1P15A UVP
LDO
RSMRST
(5V/Div)
75
100
125
LDO
RSMRST
(5V/Div)
VOUT
(500mV/Div)
VOUT
(500mV/Div)
VIN = V1P8, VCC = 5V, SLP_S0iX_B = High
Time (10μs/Div)
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VIN = V1P8, VCC = 5V, SLP_S3_B = High
Temperature from −40°C to 125°C
VIN = V1P8, VCC = 5V, SLP_S0iX_B = Low
Time (10μs/Div)
is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
V1P24A UVP
V1P5S UVP
LDO
RSMRST
(5V/Div)
VOUT
(500mV/Div)
VOUT
(500mV/Div)
VIN = V1P8, VCC = 5V
VIN = V1P8, VCC = 5V, SLP_S3_B = High
Time (10μs/Div)
Time (10μs/Div)
V1P15A OCP
V1P15A OCP
LDO
RSMRST
(5V/Div)
VOUT
(500mV/Div)
IOUT
(1A/Div)
IOUT
(1A/Div)
VIN = V1P8, VCC = 5V, SLP_S0iX_B = High
LDO
RSMRST
(5V/Div)
VOUT
(500mV/Div)
VIN = V1P8, VCC = 5V, SLP_S0iX_B = Low
Time (100μs/Div)
Time (100μs/Div)
V1P24A OCP
V1P5S OCP
LDO
RSMRST
(5V/Div)
VOUT
(500mV/Div)
IOUT
(1A/Div)
IOUT
(100mA/Div)
VIN = V1P8, VCC = 5V
Time (100μs/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
September 2015
LDO
RSMRST
(5V/Div)
VOUT
(500mV/Div)
DS5041AB-00
LDO
RSMRST
(5V/Div)
VIN = V1P8, VCC = 5V, SLP_S3_B = High
Time (100μs/Div)
is a registered trademark of Richtek Technology Corporation.
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RT5041AB
RON vs. Load Current
RON vs. Load Current
90
SW V1P8A
80
80
70
70
RON (m Ω)
RON (m Ω)
90
60
60
50
50
40
40
VIN = 3.3V, VCC = 5V
VIN = V1P8, VCC = 5V
30
30
0
200
400
600
800
SW V3P3A
0
1000
100
200
Load Current (mA)
80
70
70
RON (m Ω)
RON (m Ω)
80
60
50
VIN = V1P8, VCC = 5V, IOUT = 300mA,
Temperature from −40°C to 125°C
30
-50
-25
0
25
50
75
100
600
125
SW V3P3A
60
50
40
VIN = 3.3V, VCC = 5V, IOUT = 400mA,
Temperature from −40°C to 125°C
30
-50
-25
0
25
50
75
Temperature (°C)
Temperature (°C)
V1P8A UVP
V3P3A UVP
SW
RSMRST
(5V/Div)
100
125
SW
RSMRST
(5V/Div)
VOUT
(1V/Div)
VOUT
(500mV/Div)
VIN = V1P8, VCC = 5V
Time (10μs/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
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500
RON vs. Temperature
90
SW V1P8A
40
400
Load Current (mA)
RON vs. Temperature
90
300
VIN = 3.3V, VCC = 5V
Time (10μs/Div)
is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
V1P8A OCP
V3P3A OCP
SW
RSMRST
(5V/Div)
VOUT
(1V/Div)
VOUT
(2V/Div)
IOUT
(1A/Div)
IOUT
(500mA/Div)
VIN = V1P8, VCC = 5V
Time (50μs/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
SW
RSMRST
(5V/Div)
VIN = 3.3V, VCC = 5V
Time (50μs/Div)
is a registered trademark of Richtek Technology Corporation.
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21
RT5041AB
Application Information
Power Path
RT5041AB is a MOIC (Multi Output Integrated Circuit)
and is an integral part of the Braswell Platform focused on
power solution integration to minimize system board area.
The simplicity of MOIC allows easy adoption without any
system firmware changes and can be a direct replacement
of most of the SOC VR rails.
The RT5041AB is an integrated power solution for the
Braswell platform. It includes two DC to DC Buck
converters, three Linear Dropout regulators and two power
switches. Expect Core power, DDR power and System
3V/5V power, RT5041AB package the rest power paths
into one.
System Power
3.3V/5V
Battery
Charger
(2SXP)
DDR Power
Core Power
RT5041AB_MOIC
VIN
V1P05A
V1P8
V1P5S
V1P24A
SOC +
Platform Device
V1P15A
SW_V3P3A
SW_V1P8A
EN_V1P05A
SLP_S3_B
SLP_S0iX_B
SUSPWRDNACK
RSMRST(PG)
Figure 1. Simplified MOIC Power Rails Apply
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is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
All data of the power paths provided by RT5041AB device is listed as Table 1.
Table1. Power Path
Resource Name
Type
Voltage Range
Peak Current Rating
V1P05A
Buck Converter
1.05V
4600mA
V1P8
Buck Converter
1.8V
4100mA*
V1P5S
LDO
1.5V
100mA
V1P24A
LDO
1.24V
1000mA
V1P15A
LDO
0.75V / 1.15V
1000mA**
V3P3A
Switch
3.3V
450mA
V1P8A
Switch
1.8V
1000mA
* VIN = 5V only
** VOUT @ 1.15V
Buck Converter
Buck Over-Current Protection
RT5041AB applies two synchronous step-down buck
converters with both integrated a P-Channel high side
MOSFET and a N-Channel low side MOSFET. The
converter control scheme is based on current mode
constant-on-time (COT) architecture, which has fast
transient response and minimizes external components.
Based on the internal current ramp information, it can used
multi-layer ceramic capacitors (MLCC) as the output
capacitors without high-ESR bulk or virtual ESR network
required for the loop stability.
The OCP is implemented using a cycle-by-cycle valley
detected control circuit. The switch current is monitored
by measuring the low-side voltage between the LX pin
and PGND. The voltage is proportional to the switch current
and the on-resistance of the low-side MOSFET. To improve
accuracy, the low-side voltage sensing is temperature
compensated.
Buck converters of RT5041AB applies Power-Saving
feature by automatic enabling diode emulation mode
(DEM) as load decrease. When the load makes converter
work at continuous current mode (CCM) the frequency is
fixed at 1.2MHz.
A soft-start function is built inside. The internal current
source charges an internal capacitor to make the softstart ramp voltage. When buck converter powers up, the
output voltage will track the internal ramp voltage during
soft-start interval to prevent inrush current.
When EN_1P05A goes low to let buck converters
shutdown mode occur, or the output under-voltage fault
latch is set, the output discharge mode will be triggered.
During discharge mode, an internal switch creates a path
for discharging the output capacitors’ residual charge to
GND.
When high side MOSFET turn-on, the high-side switch
current increases at a linear rate and determines by VIN,
VOUT, TON and inductance. And when low side MOSFET
turn-on, the low-side switch current decreases linearly.
The average value of the switch current is the output load
current. If the sensing voltage of the low-side MOSFET is
above the voltage proportional to the current limit, the
converter keeps the low-side turn on until the sensing
voltage falls below the voltage proportional to the current
limit and start a new switching cycle.
Buck Output Under-Voltage Protection
When the over current limit is active, the output voltage
falls. If the output voltage falls under 60% of the reference
voltage, the UVP comparator signal goes high and an
internal UVP counter start to count. If the counted timing
is over the UVP delay time, the high-side and low-side
MOSFET will turn off and latched. The way to cannel the
latched behavior is to re-enable RT5041AB or re-give VCC
power of RT5041AB.
The buck converters have a full set of protection.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
23
RT5041AB
Buck Output Over-Voltage Protection
When the output voltage exceeds 120% of the reference,
the OVP comparator signal goes high and an internal OVP
counter start to count. If the counted timing is over the
OVP delay time, the low-side MOSFET will continue to
turn on and latched.
Buck Over-Temperature Protection
RT5041AB monitors the temperature of buck converters.
If the temperature of the buck converter is over 150°C the
OTP circuit acts and makes all power rails of RT5041AB
shutdown. They recover back with power-up sequence
when the temperature of buck converters is low to 125°C.
Linear Dropout Regulator
The RT5041AB includes three high performance linear
dropout regulators. The peak current rating is designed
for short period current, not for thermal design current.
LDOs of RT5041AB also have soft-start function. An
internal current source charges an internal capacitor to
make the soft-start ramp voltage. When LDOs power up,
the output voltage will track the internal ramp voltage during
soft-start interval to prevent inrush current.
When enable signals go low to let LDOs shutdown mode
occur, or the output under-voltage fault latch is set, the
output discharge mode will be triggered. During discharge
mode, an internal switch creates a path for discharging
the output capacitors' residual charge to GND.
RT5041AB has two enable signals SLP_S3_B and
SLP_S0iX_B to control LDO_V1P5S and LDO_V1P15A
respectively to meet the S3/S4 and S0iX power saving
mode status of Braswell platform. If SLP_S3_B signal goes
high, LDO_V1P5S powers on; otherwise, the LDO_V1P5S
keeps off. When RT5041AB powers up from internal power
up sequence, LDO_V1P15A will raise up to 1.15V with
ignoring SLP_S0iX_B signal until device detecting the first
rising edge of the signal. After detecting the first rising
edge of the SLP_S0iX_B if the SLP_S0iX_B signal goes
high, LDO_V1P15A keeps 1.15V. And if it goes low,
LDO_V1P15A changes to 0.75V.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
24
The LDO contains an independent current limit and under
voltage protection circuit to prevent unexpected
applications. The current limit circuit monitors the current
of the path from input to output by a current sensing circuit
and controls the pass transistor's gate voltage. When the
path current is over the current limit, the current limit circuit
fixes the gate voltage to limit the output current. And if
the output voltage is less than 60% of VOUT, the UVP
circuit will shutdown the LDO and latched. Re-enable
RT5041AB device to disable the latched status.
Power Switch
There are also two power switches within RT5041AB.
SW_V3P3A is a P-Channel power switch MOSFET, and
SW_V1P8A is a N-Channel power switch MOSFET.
Power switches of RT5041AB have soft-start function, too.
An internal current source charges an internal capacitor
to make the soft-start ramp voltage. When power switches
turn on, the output voltage will track the internal ramp
voltage during soft-start interval to prevent inrush current.
When EN_1P05A goes low to let power switches shutdown
mode occur, the output discharge mode will be triggered.
During discharge mode, an internal switch creates a path
for discharging the output capacitors' residual charge to
GND.
SW_V3P3A and SW_1P8A also apply current limit
protection and under voltage protection function. The
current limit circuitry prevents damage to the power switch
MOSFET and the backend device but can deliver load
current up to the current limit threshold. And if the output
voltage is less than 2.7V for SW_V3P3A or 1.2V for
SW_V1P8A, the RT5041AB will shutdown and latched.
RSMRST
RSMRST is an open-drain output and requires a pull-up
resistor. RSMRST is actually a power good output signal
for monitoring SW_V3P3A. RSMRST pulls up if
SW_V3P3A is above 90% of its nominal voltage; otherwise
the RSMRST goes low.
is a registered trademark of Richtek Technology Corporation.
DS5041AB-00
September 2015
RT5041AB
SUSPWRDNACK
MOIC VR STATUS
SUSPWRDNACK is an active high dedicated input signal
that tells the RT5041AB to turn off the power rails. If pull
up SUSPWRDNACK signal high to turn off power rails
and pull low again, the all power rails will raise up with the
power up sequence. This signal will work when EN_1P05A
goes high.
RT5041AB MOIC has three controlled enable pins
EN_1P05A, SLP_S0iX_B and SLP_S3_B for changing the
voltage rails (VR) status to match the different power saving
mode In the Braswell platform. The VR power status is
shown directly as the Table 2.
Table2. MOIC Voltage Rails Power Status
Voltage Rails
S0
S0iX
S3
S4/S5
V1P05A
ON
ON
ON
ON
V1P8
ON
ON
ON
ON
V1P5S
ON
ON
OFF
OFF
V1P24A
ON
ON
ON
ON
V1P15A
ON @ 1.15V
ON @ 0.75V
ON @ 0.75V
ON @ 0.75V
V3P3A
ON
ON
ON
ON
V1P8A
ON
ON
ON
ON
According to Table 2, set three control signals to high for
satisfying S0 mode; for case S0iX mode, give a low level
voltage to SLP_S0iX_B to change LDO_V1P15A voltage
from 1.15V to 0.75V. If the system need move into S3 or
S4/S5 status, set SLP_S0iX_B and SLP_S3_B to low to
make the action. The relations of the control signals and
the VR power status are shown in the Table 3.
Table3. Control Pin Truth Table for VR Power Status
Status
EN_1P05A
SLP_S0iX_B
SLP_S3_B
S0
High
High
High
S0iX
High
Low
High
S3
High
Low
Low
S4/S5
High
Low
Low
OFF
Low
X
X
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS5041AB-00
September 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
25
RT5041AB
MOIC SEQUENCING
Power-Off Sequence
Power-Up Sequence
There are two signals, EN_1P05A and SUSPWRDNACK,
can make all power rails of RT5041AB go to off mode.
When use EN_1P05A to disable RT5041AB, all the output
signals and power rails will be off at the same time. If use
SUSPWRDNACK signal to power off all VRs, the RSMRST
will fall down after SW_V3P3A being under 85% of its
output voltage.
When EN_1P05A comes to high RT5041AB starts an
internal power-up-sequence to enable most voltage rails.
After RSMRST signal going to high, the power-upsequence completes. Note that LDO_V1P5S is not
included in the internal power up sequence.
SLP_S0iX_B signal should come after V1P8, if use V1P8
power rail as the input of LDO_V1P5S. MOIC will monitor
LDO_V1P5S internal power good signal when SLP_S3_B
goes high. If MOIC detects fault of any internal power good
during the power up sequence, RT5041AB will be latched.
S0iX Mode and S3(S4/S5) Mode Power Status
RT5041AB is able to meet power saving requirement of
the sleep mode on the Braswell platform.
From S0 mode to S0iX mode, SLP_S0iX_B goes low;
from S0 mode to S3 (S4/S5) mode, SLP_S0iX_B and
SLP_S3_B both go to low.
SUSPWRDNACK
EN_1P05A
90%
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