®
Preliminary
RT5037
Power Management IC with Single Cell Li-Battery Switching
Charger Integrated Power Path Controller
General Description
The RT5037 is a highly integrated smart power
management IC which includes: switch-mode single cell
Li-Ion/Li-Polymer battery charger, LDO, synchronize Buck
regulator, Load Switch, and RTC-OSC for portable
applications. The RT5037 also features USB On-The-Go
(OTG) support.
The RT5037 optimizes the charging task by using a control
algorithm to vary the charge rate via different modes,
including pre-charge mode, fast charge mode, and constant
voltage mode. The key charge parameters can be
programmed via the I
2
C interface. The RT5037 resumes
the charge cycle whenever the battery voltage falls below
an internal threshold and automatically enters sleep mode
when the input power supply is removed.
Four integrated Synchronize Buck Regulators are
designed to provide MAX 2/2/1.6/1.6A application with high
efficiency.
Four integrated LDOs are designed to provide MAX
0.35/
0.35/0.35/0.35A application.
Two Load Switches are integrated with load Ron. And a
Real Time Clock (RTC) includes time counter and
a
32768Hz oscillator for portable applications.
The RT5037 also provides rich protection functions : Over
Current Protection, Under Voltage Protection, Over Voltage
Protection, Over Temperature Protection, and Over Load
Protection.
Features
Battery Charger
½
High Accuracy Voltage/Current Regulation
½
Average Input Current Regulation(AICR) : 0.1/0.5/
0.7/0.9/1/1.5/2A
Minimum Input Voltage Regulation(MIVR) : 4.2V
to 4.8V
½
Charge Voltage Regulation: 3.65V to 4.4V
½
Charge Current Regulation: 0.5A to 2A
½
Synchronous 0.75/1.5MHz Fixed Frequency PWM
Controller With Up To 95% Duty Cycle
½
Reverse Leakage Protection To Prevent Battery
Drainage
½
Thermal Regulation
½
IRQ Output For Communication With I
2
C
½
Battery Temperature Detection
½
Reverse Boost to Support OTG 1A
4 LDOs
½
MAX Output Current 0.35/0.35/0.35/0.35A
2
½
I C Programmable Output Level
4 LV Buck Regulators
½
MAX Output Current 2/2/1.6/1.6A
2
½
I C Programmable Output Level
½
No Schottky Barrier Diode Required
½
1.5M/3MHz Fixed Frequency Operation
½
Auto Discharge Function
RTC Timer and Oscillator
2 Load Switches
½
Ordering Information
RT5037
Package Type
QW : WQFN-40L 5x5 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
½
Applications
Cellular Telephones
Personal Information Appliances
Tablet PC, Power Bank
Portable Instruments
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
is a registered trademark of Richtek Technology Corporation.
½
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
DS5037-P02_RK
January 2015
www.richtek.com
1
RT5037
Pin Configurations
(TOP VIEW)
IRQ
SCL
SDA
STB_EN
XTALIN
XTALOUT
PWRON
CLKOUT
RESETB
VOUTSB1
Preliminary
Marking Information
RT5037GQW : Product Number
RT5037
GQW
YMDNN
YMDNN : Date Code
40 39 38 37 36 35 34 33 32 31
VINCHG
VMIDCHG
LXCHG
VBOOTCHG
VDDA
VBATS
ISENSN
ISENSP
PPCTRL
TS
1
2
3
4
5
6
7
8
9
10
11 12 13 14 15 16 17 18 19 20
41
30
29
28
27
26
25
24
23
22
21
PGND
VINB1
LXB1
LXB2
VINB2
VINB4
LXB4
LXB3
VINB3
VOUTSB2
VOUTSB4
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
14
13
15
16
17
18
Pin Name
VINCHG
VMIDCHG
LXCHG
VBOOTCHG
VDDA
VBATS
ISENSN
ISENSP
PPCTRL
TS
VINL1
VOL1
VINL234
VOL2
VOL3
VOL4
VOUTLSW2
VINLSW
Pin Function
Charger Input Voltage For Adaptor/USB Power Source.
Connection Point Between Reverse Blocking and High Side MOSFET.
Internal Switch Node To Output Inductor Connection of Switching Charger
Bootstrap Power Node For Switching Charger
Internal Power For Analog Blocks, Put 1F To GND.
Battery Voltage Regulation Node for Charger.
Charging Current Sensing Negative Node.
Charging Current Sensing Positive Node
External Power Path Control. Used to control external power P-MOSFET
to achieve power path operation.
Battery Temperature Detection.
Input Power for LDO1.
Output Voltage Regulation Node for LDO1.
Input Power for LDO2, LDO3, LDO 4.
Output Voltage Regulation Node for LDO2.
Output Voltage Regulation Node for LDO3.
Output Voltage Regulation Node for LDO4.
Output Pin for Load Switch 2.
Input Pin for Load Switches GOOD.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
VINL1
VOL1
VOL2
VINL234
VOL3
VOL4
VOUTLSW2
VINLSW
VOUTLSW1
VOUTSB3
WQFN-40L 5x5
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS5037-P02_RK
January 2015
Preliminary
Pin No.
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41 (Exposed Pad)
Pin Name
VOUTLSW1
VOUTSB3
VOUTSB4
VOUTSB2
VINB3
LXB3
LXB4
VINB4
VINB2
LXB2
LXB1
VINB1
VOUTSB1
RESETB
CLKOUT
PWRON
XTALOUT
XTALIN
STB_EN
SDA
SCL
IRQ
PGND
Output Pin for Load Switch 1.
Output Voltage Regulation Node for Buck3.
Output Voltage Regulation Node for Buck4.
Output Voltage Regulation Node for Buck2.
Input Power for Buck3.
Pin Function
RT5037
Internal Switch Node to Output Inductor Connection for Buck3.
Internal Switch Node to Output Inductor Connection for Buck4.
Input Power for Buck4.
Input Power for Buck2.
Internal Switch Node to Output Inductor Connection for Buck2.
Internal Switch Node to Output Inductor Connection for Buck1.
Input Power for Buck1.
Output Voltage Regulation Node for Buck1.
Power-On Reset Output and Reset Key Input. Open drain, Connect A
Pull-Up Resister. The pin is high impedance after RT5037 booting
completely, otherwise, the pin is short to GND. Low pulse to triggers soft
reset event.
RTC 32768Hz Clock Output. Open drain.
Power On Key Input. Low pulse to triggers power-on event.
Crystal Output. This pin’s parasitic capacitance should be kept as low as
possible. Noise interference should also be avoided.
Crystal Input. This pin’s parasitic capacitance should be kept as low as
possible. Noise interference should also be avoided.
Standby Mode control pin. From low to high will trigger standby mode and
from high to low will leave standby mode.
Data Input For I
2
C. Open Drain, Connect A Pull-Up Resister.
Clock Input For I
2
C. Open Drain, Connect A Pull-Up Resister
IRQ Output Node. Open drain.
The exposed pad must be soldered to a large PCB and connected to
PGND for maximum thermal dissipation and current flow.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5037-P02_RK
January 2015
www.richtek.com
3
RT5037
Function Block Diagram
VDDA
Analog Base
Preliminary
LDO1 350mA
XTALIN
XTALOUT
CLKOUT
VINB4
LDO3 350mA
LXB4
DCDC4
1.6A
Real-Time
Clock (RTC)
LDO2 350mA
VINL1
VOL1
VINL234
VOL2
VOL3
LDO4 350mA
VOL4
VOUTSB4
VINB3
Load SW1
350mA
Load SW2
350mA
VINLSW
VOUTLSW1
VOUTLSW2
LXB3
DCDC3
1.6A
VOUTSB3
VINB2
Controller I C
Programmable
VINCHG
2
LXB2
DCDC2
2A
VMIDCHG
VBOOTCHG
VOUTSB2
VINB1
Charger 2A
OTG 1A
LXB1
DCDC1
2A
LXCHG
ISENSP
ISENSN
PPCTRL
VBATS
TS
State
Machine
PGND
VOUTSB1
PWRON
SCL
SDA
IRQ
STB_EN
RESETB
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS5037-P02_RK
January 2015
Preliminary
Flow Chart
Power Channel Flow Chart
Power-Off
RT5037
No
Plug Adaptor
Check
Yes
PWRON
Check
Yes
No
Power-On
Sequence
Yes
No
Falling edge at
STB_EN
No
No
RESETB
Check
Buck1 to Buck4,
LDO1 to LDO4
level reset to
default value
<00>
Rising-edge at
2
STB_EN pin or I C Set
STB_Trigger = <1>
Yes
Standby Mode
Normal Operation
Yes
RESET_Actio <01>
n Check
<10>
No
OverTemp
Check
Protection
Check
No
PWROFF
Check
No
No
RESETB
Check
Buck1 to Buck4,
LDO1 to LDO4
level reset to
Normal mode
default value
<00>
Yes
Yes
Yes
Yes
delay1 power-off
then delay2
power-on PMIC
Power-Off
delay1 Power-Off
<01> RESET_Action
Check
<10>
Note : RESETB Check : From
“LOW“
to
“HIGH”
rising input into RESETB pin with 100ms debouncing time
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5037-P02_RK
January 2015
www.richtek.com
5
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