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ee General Description Sahhigh performance charge pump The RT9361A/B is tathat produces a regulated 4.5V and 5V DC/DC converter a output. NoD external inductor is required for operation. The . operating voltage range is 2.8V to Vout. Internal soft-start w w circuitry effectively reduces the in-rush current both while w and mode change. start-up
The RT9361A/B features very low quiescent current, over current protection and short circuit protection. The RT9361A/B is available in SOT-23-6 package.
Tiny Package, High Performance, Regulated Charge Pump t
Features
Input Voltage Range : 2.8V to VOUT Internal Soft Start Function 5V/4.5V Fixed Output Voltage Over Current Protection Function Short Circuit Protection Function RoHS Compliant and 100% Lead (Pb)-Free
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RT9361A/B
Applications
Ordering Information
RT9361A/B Package Type E : SOT-23-6 Operating Temperature Range C : Commercial Standard P : Pb Free with Commercial Standard Output Voltage A : 5V B : 4.5V
Note : RichTek Pb-free products are : ments of IPC/JEDEC J-STD-020. -100%matte tin (Sn) plating.
Mobile phone, Smart Phone LED Backlight Camera Flash White LED LCD Display Supply
Pin Configurations
-RoHS compliant and compatible with the current require-Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail.
VIN + CIN
w
w
w
.D
t a
S a
e h
t e
U 4
CP 6 1
.c
VIN 5 2
m o
CN 4 3 EN
(TOP VIEW)
VOUT GND
SOT-23-6 Note : There is no pin1 indicator on top mark for SOT-23-6 type, and pin1 will be lower left pin when reading top mark from left to right.
Typical Application Circuit
CPUMP 6
CP
4
CN VOUT 1
5 VIN
RT9361A/B 3 EN
GND
COUT
R
2.8V to VOUT
2
DS9361A/B-04 May 2005
w
w
w
.D
a
aS t
ee h
LED
4U t
R
.
om c
R
LED LED
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RT9361A/B
Part No. RT9361A RT9361B Application Configuration IOUT<60mA@ VIN>3.2V, IOUT<110mA@ VIN>3.2V, IOUT<80mA@ VIN>3.2V, IOUT<150mA@ VIN>3.2V, CIN (uF) 1 or 2.2 10 1 or 2.2 10 CPUMP (uF) COUT (uF) 0.22 1 or 2.2 1 0.22 1 10 1 or 2.2 10
Functional Pin Description
Pin Number Pin Name Pin Function 1 2 3 4 5 6 VOUT GND EN CN VIN CP Output Voltage Ground Chip Enable (Active High) Flying Capacitor Negative Terminal Power Input Voltage Flying Capacitor Positive Terminal
Function Block Diagram
CP CN
VIN
x2 Charge Pump
VOUT
1MHz
+ -
>
VREF Short Circuit EN Band Gap OSC VREF
>1MHz
GND
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DS9361A/B-04 May 2005
RT9361A/B
Absolute Maximum Ratings
(Note 1) -0.3V to 6V -0.3V to 6V 0.4W 250C/W 260C -40C to 125C -65C to 150C 2kV 200V Supply Input Voltage ----------------------------------------------------------------------------------------------------Other I/O Pin Voltages --------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C SOT-23-6 -------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) SOT-23-6, JA --------------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature Range -------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) --------------------------------------------------------------------------------------------MM (Machine Mode) -----------------------------------------------------------------------------------------------------
Recommended Operating Conditions Electrical Characteristics
(VIN = 3.7V, TA = 25C, unless otherwise specified)
(Note 3)
Operation Temperature Range ------------------------------------------------------------------------------------------ -40C to 85C
Parameter Operation Voltage Range Output Voltage Quiescent Current Maximum Output Current
Symbol VIN VOUT VOUT IQ IOUT IOUT VOUT = 5V
Test Condition
Min 2.8 4.8 4.32 -110 150 250 300 --
Typ -5 4.5 2 --350 350 60 30 0.1 1 ---
Max VOUT 5.2 4.68 4 --500 500 90 -1 1.3 -0.4
Units V V V mA mA mA mA mA mA mV uA MHz V V
RT9361A , VIN>3.2V, IOUT<110mA RT9361B , VIN>3.2V ,IOUT<150mA IOUT = 0, RT9361A , VIN>3.2V, CPUMP = 1uF RT9361B , VIN>3.2V, CPUMP = 1uF RT9361A RT9361B
OCP Short Circuit Current Output Ripple Shut Down Current Operation Frequency Digital Input High Level Digital Input Low Level ISHDN FOSC VIH VIL
IOUT = 60mA, COUT = 2.2uF VIN = 4.5V, VEN<0.4V
--0.8 1.5 --
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. 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 for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. JA is measured in the natural convection at T A = 25C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. DS9361A/B-04 May 2005 www.richtek.com 3
RT9361A/B
Typical Operating Characteristics
(For RT9361A, CIN = COUT = 2.2F, CPUMP = 0.22F, TA = 25C, unless otherwise specified ) Quiescent Current vs. Input Voltage Output Voltage vs. Output Current
5.1 5
1.7 1.6
Quiescent Current (mA)
Output Voltage (V)
4.9 4.8 4.7 4.6 4.5 4.4 10 20 30
VIN VIN VIN VIN
= 3.2V = 3.7V = 4.3V = 5V
TA = 85C TA = 25C
1.5 1.4
TA = -20C
1.3 1.2 1.1 1
TA = -40C
40
50
60
70
80
2.8
3
3.2 3.4 3.6 3.8
4
4.2 4.4 4.6 4.8
5
Output Current (mA)
Input Voltage (V)
Output Voltage vs. Supply Voltage
5.08
5.1
Output Voltage vs. Supply Voltage
TA = 85C
5.04
5 Output Voltage (V)
Output Voltage (V)
5 4.96 4.92 4.88 4.84
TA = 25C TA = -40C
4.9 4.8 4.7 4.6
IOUT = 10mA IOUT = 20mA IOUT = 30mA IOUT = 40mA IOUT = 50mA IOUT = 60mA IOUT = 70mA IOUT = 80mA
IOUT = 60mA
4.8 2.75
4.5
3
3.25
3.5
3.75
4
4.25
4.5
4.75
5
3
3.25
3.5
3.75
4
4.25
4.5
4.75
5
Supply Voltage (V)
Supply Voltage (V)
Output Voltage vs. Temperature
5.08
1.4
Operation Frequency vs. Temperature
Operation Frequency (MHz)
5.075 5.07
IOUT = 0mA
1.3
Output Voltage (V)
IOUT = 60mA
1.2 1.1 1 0.9 0.8
5.065 5.06 5.055 5.05 5.045 5.04 5.035 5.03 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80
IOUT = 60mA
IOUT = 0mA
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80
Temperature (C)
Temperature (C)
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RT9361A/B
Efficiency vs. Output Curent
0.85 85 0.8 80 0.75 75
1 100
Efficiency vs. Input Voltage
VIN = 3V
0.9 90
Efficiency (%)
0.65 65 0.6 60 0.55 55 0.5 50 0.45 45 0.4 40 10 15 20 25 30 35 40 45 50 55 60
Efficiency (%)
0.7 70
VIN = 3.4V
0.8 80 0.7 70 0.6 60
VIN = 4.2V
50 0.5 40 0.4
IOUT IOUT IOUT IOUT IOUT IOUT
= = = = = =
10mA 20mA 30mA 40mA 50mA 60mA
2.75
3
3.25
3.5
3.75
4
4.25
4.5
4.75
5
Output Curent (mA)
Input Voltage (V)
VIH vs. Supply Voltage
1.5 1.4 1.3
1.4 1.3 1.2
VIL vs. Supply Voltage
TA = -40C
VIH (V)
V IL (V)
1.2 1.1 1 0.9 0.8 2.75
TA = -40C
1.1 1 0.9 0.8 2.75
TA = 25C TA = 85C
TA = 25C TA = 85C
3
3.25
3.5
3.75
4
4.25
4.5
4.75
5
3
3.25
3.5
3.75
4
4.25
4.5
4.75
5
Supply Voltage (V)
Supply Voltage (V)
Inrush Current
VIN VIN
(2V/Div) (2V/Div)
Inrush Current
(2V/Div)
(2V/Div)
VOUT
(2V/Div)
VOUT
(2V/Div)
EN
(500mA/Div) VIN = 2.8V, IOUT = 60mA
EN
(500mA/Div)
I IN
I IN
VIN = 5V, IOUT = 60mA
Time (40s/Div)
Time (40s/Div)
DS9361A/B-04 May 2005
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RT9361A/B
Normal Operation
VIN VOUT
(2V/Div) (2V/Div) (1V/Div)
Normal Operation
VIN VOUT
(2V/Div) (2V/Div) (2V/Div)
CN IOUT
CN IOUT
VIN = 2.8V, IOU T = 60mA
(50mA/Div)
(50mA/Div) VIN = 5V, IOUT = 60mA
Time (400ns/Div)
Time (400ns/Div)
Refer to Application Informatiom "Figure 1"
VIN VOUT
(2V/Div) (2V/Div) (2V/Div)
(2V/Div)
VIN VOUT
(2V/Div) (2V/Div)
PWM
PWM
I IN
(50mA/Div) VIN = 3.7V
I IN
(50mA/Div) VIN = 3.7V
Time (40s/Div)
Time (10ms/Div)
Maximum Output Current vs. Input Voltage
160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 2.8 3
Maximum Output Current (mA)
TA = -40C TA = -20C TA = 25C TA = 85C
3.2 3.4 3.6 3.8
4
4.2 4.4 4.6 4.8
5
Input Voltage (V)
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DS9361A/B-04 May 2005
Refer to Application Informatiom "Figure 1"
Dimming Operation
Dimming Operation
RT9361A/B
Application Information
Capacitor Selection Careful selection of the three external capacitors CIN, COUT and CPUMP is very important because they will affect rampup time, output ripple and transient performance. Optimum performance will be obtained when low ESR (<100m) ceramic capacitors are used for CIN and COUT and CPUMP. In general, low ESR may be defined as less than 100m. In all cases, X7R or X5R dielectric are recommended. For particular application, low ESR Tantalum capacitors may be substituted; however optimum output ripple performance may not be realized. Aluminum electrolytic capacitors are not recommended for using with the RT9361A/B due the their inherent high ESR characteristic. In general, lower values for CIN, COUT and CPUMP may be utilized for light load current applications (<60mA). Drawing a load current of 60mA or less may use a CIN and COUT capacitor value as low as 2.2F and a CPUMP value of 0.22F. CIN and COUT may range from 1F for light loads to 10F for heavy output load conditions (<110mA). CPUMP may range from 0.22F for light loads to 1F for heavy output load conditions. If CPUMP is increased, COUT should also be increased by the same ratio to minimize output ripple. As a basic rule, the ratio between CIN, COUT and CPUMP should be approximately 10 to 1. Lowering the CIN, COUT and CPUMP value can decrease the ramp-up time of VOUT, but it will increase the output ripple oppositely. Efficiency The efficiency of the charge pump regulator varies with the output voltage version, the applied input voltage, the load current, and the internal operation mode of the device. The approximate efficiency is given by: VOUT x IOUT P Efficiency (%) = OUT x 100 = x 100 PIN VIN x 2IOUT = VOUT x 100 - - - (x2 Charge Pump Operating Mode) 2VIN
VIN +
EN GND
CPUMP 0.22uF COUT 2.2uF R 100 LED 20mA PWM 100 to 15kHz R 100 LED 20mA R 100 LED 20mA
CIN 2.2uF +
CP VIN
CN VOUT
RT9361A/B VIN
EN GND
Figure 1. Application circuits for backlight dimming
CPUMP 1uF COUT 10uF VOUT 4.5V/150mA R
CIN 10uF
+
CP VIN
CN VOUT
RT9361A/B VIN R
EN GND
R LED
LED
LED
Figure 2. Application circuits for flash LEDs
CPUMP 1uF
CIN 10uF
CP VIN
CN VOUT
L 1uH
VOUT 5V/110mA
RT9361A/B COUT 10uF 1uF
For a charge pump with an output of 5 volts and a nominal input of 3 volts, the theoretical efficiency is 83.33%. Due to internal switching losses and IC quiescent current consumption, the actual efficiency can be measured as 82.72%.
Figure 3. Application circuits for constant load
DS9361A/B-04 May 2005
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RT9361A/B
CPUMP 1uF VOUT 5V/180mA
CIN 10uF VIN + 3.3V
CP VIN
CN VOUT
RT9361A/B
EN GND
COUT 10uF
CPUMP
1uF
CP VIN
CN VOUT
RT9361A/B
EN GND
Figure 4. Application circuits for doubling the output current PCB Board Layout The RT9361A/B is a high-frequency switched-capacitor converter, and therefore large transient currents will flow in VIN and VOUT. For best performance and to minimize ripple, place all of the components as close to IC as possible. Besides a solid ground plane is recommended on the bottom layer of the PCB. The ground of CIN and COUT should be connected together and as close to the IC as possible. Figure 5 and Figure 6 shows the typical PCB layout of RT9361A/B EVB board.
Figure 5
Figure 6
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DS9361A/B-04 May 2005
RT9361A/B
Outline Dimension
H D L C B
b A A1 e
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 0.000 1.397 0.250 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610
Dimensions In Inches Min 0.031 0.000 0.055 0.010 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024
SOT-23-6 Surface Mount Package
RICHTEK TECHNOLOGY CORP.
Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
DS9361A/B-04 May 2005
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