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STOD02
Dual DC-DC converter for powering AMOLED display
Features

Step-up and inverter converters Operating input voltage range from 2.5 V to 4.5 V Synchronous rectification for both DC-DC converters 150 mA maximum output current 4.6 V fixed positive output voltage Programmable negative voltage by S-wire from - 2.3 V to - 5.9 V Typical efficiency: 85 % Pulse skipping mode in light load condition (IO < 10 mA) 1.6 MHz PWM mode control switching frequency (IO > 10 mA) Enable pin for shutdown mode Low quiescent current: < 1 A in shutdown mode Soft-start with inrush current protection Over temperature protection Temperature range: -40 C to 85 C True shutdown mode Fast outputs discharge circuit after shutdown Package: DFN 12 leads - (3 x 3 mm)

DFN12L (3 x 3 mm)
PDAs Camcorders and digital still cameras
Description
The STOD02 is a dual DC-DC converter meant to power AMOLED displays. It integrates a step up and an inverting DC-DC converter making it particularly suitable for battery operated products, where the major concern is the overall system efficiency. STOD02 works in pulse skipping mode during low load condition and in PWM-mode (at 1.6 MHz) for medium/high load condition. The high frequency allows reducing the value and number of external components just to 6 components needed. The enable pin allows turning off the device so reducing the current consumption to less that 1 A. The negative output voltage can be programmed by an MCU through a dedicated pin which implements singlewire protocol. Soft-start with controlled inrush current limit and thermal shutdown are integrated functions of the device.
Applications

Active matrix organic LED power supply (AMOLED) Mobile phones Device summary
Order code STOD02PUR STOD02TPUR
Table 1.
Package DFN12L (3 x 3 x 0.8 mm) DFN12L (3 x 3 x 0.6 mm)
Packaging 3000 parts per reel 3000 parts per reel
June 2009
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Contents
STOD02
Contents
1 2 3 4 5 6 7 8 9 10 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 S-wire protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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STOD02
Diagram
1
Figure 1.
Diagram
Block diagram
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Pin configuration
STOD02
2
Figure 2.
Pin configuration
Pin connections (top view)
Table 2.
Pin n 1 2 3 4 5 6 7 8 9 10 11 12
Pin description
Symbol LX1 PGND VO1 NC AGND VREF S-wire EN VO2 LX2 VINA VINP exposed pad Description Switching node of the step up converter Power ground pin Step up converter output voltage Not connected Signal ground pin. This pin must be connected to power ground pin External voltage reference Negative voltage setting pin, uses S-wire protocol Enable control pin. ON = VI. When pulled low, the device goes in shutdown mode Inverting converter output voltage Switching node of the inverting converter Analog input supply voltage Power input supply voltage Internally connected to AGND. Exposed pad must be connected to AGND and PGND in the PCB layout in order to guarantee proper operation of the device.
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STOD02
Maximum ratings
3
Table 3.
Symbol VINA, VINP EN,S-wire ILX2 LX2 VO2 VO1 LX1 ILX1 VREF PD Tst TJ ESD
Maximum ratings
Absolute maximum ratings
Parameter DC supply voltage Enable pin, S-wire pin Inverting converter's switching current Inverting converter switching node Inverting converter output voltage Step-up converter output voltage Step-up converter switching node Step up converter's switching current Reference voltage Power dissipation Storage temperature range Maximum junction temperature ESD protection HBM Value -0.3 to 6 -0.3 to 6 Internally limited -10 to VINP+0.3 -10 to GND+0.3 -0.3 to 6 -0.3 to VO1+0.3 Internally limited -0.3 to 3 Internally limited -65 to 150 150 2 Unit V V A V V V V A V mW C C kV
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Thermal data
Parameter Thermal resistance junction-ambient referred to FR-4 PCB Thermal resistance junction-case Value 49.1 4.216 Unit C/W C/W
Table 4.
Symbol RthJA RthJC
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Application
STOD02
4
Figure 3.
Application
Typical application circuit
A
Table 5.
Symbol L1 L2 CIN C01, C02 Cref
Typical external components
Parameter Inductor Inductor Ceramic capacitor SMD Ceramic capacitor SMD Ceramic capacitor SMD Min. Typ. 4.7 4.7 4.7 4.7 1 Max. Unit H H F F F
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Electrical characteristics
5
Electrical characteristics
TJ = 25 C, VINA = VINP = 3.7 V, IO1,2 = 30 mA, CI = 4.7 F, CO1,2 = 4.7 F, CREF = 1 F, L1 = 4.7 H, L2 = 4.7 H, VEN = VINA = VINP, VO1 = 4.6 V, VO2= -4.9 V unless otherwise specified.
Table 6.
Symbol
Electrical characteristics
Parameter Test conditions Min. Typ. Max. Unit
General section VIN UVLO_H UVLO_L I_VI IS VEN H VEN L IEN FSW D1MAX D2MAX Operating input voltage VO1=4.6V, TJ = -40 to 85C range Under voltage lockout HIGH Under voltage lockout LOW Input current Shutdown current Enable high threshold Enable low threshold Enable input current Frequency Step-up maximum duty cycle Inverting maximum duty cycle IO1,2=10 to 30mA, VO1=4.6V, VO2=-4.9V VREF IREF Total system efficiency IO1,2=30 to 150mA, VO1=4.6V, VO2=-4.9V IREF=10A At VREF = VREF - 1.5% 1.196 100 VINA rising, TJ = -40 to 85C VINA falling, TJ = -40 to 85C No Load condition (I_VI = IINA + IINP) VEN = GND, (IS = IINA + IINP) VINA= 2.5V to 4.5V, TJ = -40 to 85C VINA= 2.5V to 4.5V, TJ = -40 to 85C VEN = VI PWM mode, TJ = -40 to 85C 1.35 1.6 90 90 80 % 85 1.209 1.222 V A 1.2 V 0.4 1 1.85 A MHz % % 2.30 2.5 2.40 2.35 1 1.5 1 4.5 2.50 V V V mA A
Voltage reference Voltage reference current capability
Step-up converter section VO1 Line/Load maximum VINA=2.5V to 4.5V, IO1=5mA to 100mA output voltage variation VINA=2.5V to 4.5V, IO1=5mA, IO2 no load; TJ=-40C to 85C VINA=2.5V to 4.5V, IO1=100mA, IO2 no load, TJ=-40C to 85C VINA=3.5V to 3.0V, IO1=100mA TJ=-40C to 85C, TR=TF=50s output voltage variation with respect to nominal VO1 4.55 4.6 0.5 % 0.5 4.65 V
VO1 SL
Static line regulation (1)
VO1 LT
Line transient
-12
mV
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Electrical characteristics Table 6.
Symbol
STOD02
Electrical characteristics (continued)
Parameter Test conditions IO1=5 to 100mA, IO2 no load, VINA=2.5V; TJ=-40C to 85C IO1=5 to 100mA, IO2 no load, VINA=4.5V; TJ=-40C to 85C IO1=3 to 30mA and IO1=30 to 3mA, TR=TF=30s, output voltage variation with respect to nominal VO1 IO1=10 to 100mA and IO1=100 to 10mA, TR=TF=30s, output voltage variation with respect to nominal VO1 IO1=5 to 100mA; 0.5Vpp pulse signal applied to VI at 200Hz; TDMA Noise VI=2.9V to 5.5V Vo1 below 10% of nominal value TJ = -40 to 85C TJ = -40 to 85C 150 0.9 0.8 0.5 1.0 1.0 Min. Typ. +1 % +1 Max. Unit
VO1
Static load regulation (2)
30 mV 35
VO1t
Load transient regulation
VO1
IO1 I-L1MAX RDSONP1 RDSONN1
Ripple output voltage range (peak to peak) Maximum Step-up output current Ipeak current
20
mV mA A
Inverting converter section VO2 VO2 def. VO2 Toll. Output negative voltage 10 different values set by S-wire pin (see range Table 9) VO2 default value VO2 tolerance Default output voltage Output voltage variation with respect to nominal VO selected VINA=2.5V to 4.5V, IO2=5mA, IO1 no load; TJ=-40C to 85C VINA=2.5V to 4.5V, IO2=100mA, IO1 no load, TJ=-40C to 85C VINA=3.5V to 3.0V, IO2=100mA TJ=-40C to 85C, TR=TF=50s output voltage variation with respect to nominal VO2 IO2=5 to 100mA, IO1 no load, VINA=2.5V; TJ=-40C to 85C IO2=5 to 100mA, IO1 no load, VINA=4.5V; TJ=-40C to 85C Load transient regulation Load transient regulation HC IO2=3 to 30mA and IO2=30 to 3mA, TR=TF=30s, output voltage variation with respect to nominal VO2 IO2=10 to 100mA and IO2=100 to 10mA, TR=TF=30s -2.3 -4.80 -4.9 2 +1 +1 -5.9 -5.00 V V % % %
VO2
Static line regulation
(3)
VO1 LT
Line transient
+30
mV
+1 % +1
VO2
Static load regulation (4)
VO2t VO2e
40
80
mV
30
50
mV
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STOD02 Table 6.
Symbol VO2 IO2s IO2 I-L2MAX RDSONP2 RDSONN2 Thermal shutdown OTP OTPHYST Over temperature protection Over temperature protection hysteresis
Electrical characteristics Electrical characteristics (continued)
Parameter Ripple output voltage range Maximum inverting output current Maximum inverting output current Ipeak current Test conditions IO2=5 to 100mA 0.5Vpp pulse signal applied to VI at 200Hz; TDMA Noise VINA=2.5V to 2.9V VINA=2.9V to 4.5V VO2 below 10% of value set by S-wire TJ = -40 to 85C TJ = -40 to 85C -1.2 0.4 0.4 Min. Typ. Max. 25 -120 -150 -1.1 2.0 1.0 Unit mV mA mA A
140 15
C C
Discharge resistor RDIS TDIS Discharge resistor value Discharge time 600 6 ms
1. [(VO1MAX - VO1MIN) / (VO1 at 25C and VINA = 2.5 V)] x 100 2. [(VO1MAX - VO1MIN) / (VO1 at 25C and IO1 = 5 mA)] x 100 3. [(VO2MAX - VO2MIN) / (VO2 at 25C and VINA = 2.5 V)] x 100 4. [(VO2MAX - VO2MIN) / (VO2 at 25C and IO2 = 5 mA)] x 100
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S-wire protocol
STOD02
6
Figure 4.
.
S-wire protocol
S-wire protocol
Table 7.
. .
Time
Rating Symbol Ten_dly Tss1 Toff_dly1 Tvo_off_dly1 Tih Tss2 Tsh Tsl Tstop Tvo_off_dly2 Twait Toff_dly2 300 2 2 300 12 0 Min. Typ. 300 2 50 12 300 2 20 20 400 3 45 75 400 related to load 10 400 Max. Unit s ms s ms s ms s s s ms s s
Enable high delay time Soft-start delay Turn-off delay VO turn-off delay S-Wire initial time Soft-start time by S-wire enable S-Wire High S-Wire Low S-Wire signal stop indicate time VO turn-off delay by S-Wire Twait after data S-Wire turn-off detection time
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S-wire protocol
Figure 5.
Waveform
TON TWK VIH VIL
TOFF
Tf
Tr
90%
10%
BIT= 1
BIT= 0
BIT= 0
Table 8.
Time
Rating Symbol VIH VIL RS-WIRE TWK Tr Tf TON TOFF FS-WIRE 2 2 Min. 1.2 0 150 1 200 200 45 75 400 Typ. Max. VINA 0.6 Unit V V k s ns ns s s kHz
Rising input high threshold voltage level Falling input high threshold voltage level Pull down resistor Wake up delay S-Wire rising time S-Wire falling time Clocked s-wire high S-wire low Input S-Wire frequency
Table 9.
Inverting output voltages
Bit clock 1 2 3 4 5 6 7 8 9 10 Doc ID 15245 Rev 3 VO2 (V) -2.3 -2.7 -3.1 -3.5 -3.9 -4.3 -4.7 -5.1 -5.5 -5.9 11/23
S-wire protocol Table 10. Enable and s-wire pin settings
Enable 0 0 1 1 S-wire 0 1 0 1 Action Device off
STOD02
Output set by S-Wire Default value output (- 4.9 V) Default value output (- 4.9 V)
Note: Figure 6.
Enable pin must be set to GND while using S-wire function. Single wire programming
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Typical performance characteristics
7
Typical performance characteristics
CI = CO1,2 = 4.7 F, CREF = 1 F, L1 = L2 = 4.7 H, TJ = 25 C
Figure 7.
88% 86% 84% 82%
Efficiency vs. input voltage
Figure 8.
90% 88% 86% 84% Efficiency 82% 80% 78% 76%
Efficiency vs. output current
Efficiency
80% 78% 76% 74%
IOUT=100mA
72% 70% 2.5 2.9 3.3 3.7 VIN [V] 4.1 4.5 4.9 5.3
74% 72% 70% 0 20 40 60 80 IOUT [mA] 100 120 140 160
Efficiency values are measured using MARUWA CXFU0208-4R7 (0.44 DC resistance)
Efficiency values are measured using MARUWA CXFU0208-4R7 (0.44 DC resistance)
Figure 9.
Step-up inductor peak current vs. input voltage
Figure 10. Inverting inductor peak current vs. input voltage
VEN=VINA=VINP=2.3 to 4.5 V, VO1=below 10% of nominal value, VO2=-4.9 V
VEN=VINA=VINP=2.3 to 6 V, VO2=below 10% of nominal value, VO1=4.6 V
2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 2 2.5 3 3.5 4 4.5 5 INPUT VOLTAGE [V]
0 -0.2 -0.4 -0.6 -0.8 -1 -1.2 -1.4 -1.6 -1.8 -2 2 3 4 INPUT VOLTAGE [V] 5 6
Figure 11. PWM step-up frequency vs. temperature
VEN=VINA=VINP=3.7V, L1=L2=OPEN LOOP replaced by 100 resistor, IO1,2=NO LOAD, VO1=+4V, VO2=-4V externally forced, TJ=-55C to 125C
I-L1MAX [A]
Figure 12. PWM inverting frequency vs. temperature
VEN=VINA=VINP=3.7V, L1=L2=OPEN LOOP replaced by 100 resistor, IO1,2=NO LOAD, VO1=+4V, VO2=-4V externally forced, TJ=-55C to 125C
I-L2MAX [A]
2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE [C]
2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE [C]
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FREQUENCY [MHz]
FREQUENCY [MHz]
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Typical performance characteristics
STOD02
Figure 13. Quiescent current vs. temperature
0.650
Figure 14. Input current vs. temperature
1.500 1.400 INPUT CURRENT [mA] 1.300 1.200 1.100 1.000 0.900 0.800
0.550
0.450 Iq [A]
0.350
0.250
0.150
0.050 -40 -15 10 35 60 85 TEMP [C]
-40
-15
10
35
60
85
TEMP [C]
VEN=GND, VINA=VINP=3.7V
VEN=VINA=VINP=3.7V, IO1=IO2=NO LOAD, VO1=4.6V, VO2=-4.9V
Figure 15. Step-up line transient regulation
Figure 16. Inverting line transient regulation
VI
VI
VO1
VO2
VEN=VINA=VINP=3.5V to 3V, IO1=100mA, IO2=NO LOAD, VO1=4.6V, VO2=-4.9V, TR=TF=50s
VEN=VINA=VINP=3.5V to 3V, IO1=NO LOAD, IO2=100mA, VO1=4.6V, VO2=-4.9V, TR=TF=50s
Figure 17. Step-up load transient regulation
Figure 18. Inverting load transient regulation
VO1
VO2
IO1
IO2
VEN=VINA=VINP=3.7V, IO1=3 to 30mA & IO1=30 to 3mA, VO1=4.6V, VO2=-4.9V, IO2=NO LOAD, TR=TF=30s
VEN=VINA=VINP=3.7V, IO2=3 to 30mA & IO2=30 to 3mA, VO1=4.6V, VO2=-4.9V, IO1=NO LOAD, TR=TF=30s
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Typical performance characteristics
Figure 19. Fast discharge
VEN V02
V01
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Demonstration board
STOD02
8
Demonstration board
Figure 20. Suggested demonstration board schematic (top layer view)
Figure 21. Suggested demonstration board schematic (bottom layer view)
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Package mechanical data
9
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark.
Table 11.
DFN12L (3 x 3 x 0.8 mm) mechanical data
mm. Dim. Min. A A1 A3 b D D2 E E2 e L 0.30 0.18 2.85 1.87 2.85 1.06 0.70 0 Typ. 0.75 0.02 0.20 0.25 3 2.02 3 1.21 0.45 0.40 0.50 0.30 3.15 2.12 3.15 1.31 Max. 0.80 0.05
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Package mechanical data
STOD02
Figure 22. Drawing dimension DFN12L (3 x 3 x 0.8 mm)
8065043-A
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Package mechanical data
DFN12L (3 x 3 x 0.6 mm) mechanical data
mm. Dim. Min. A A1 A3 b D D2 E E2 e L 0.30 0.18 2.85 1.87 2.85 1.06 0.51 0 Typ. 0.55 0.02 0.20 0.25 3 2.02 3 1.21 0.45 0.40 0.50 0.012 0.30 3.15 2.12 3.15 1.31 0.007 0.112 0.074 0.112 0.042 Max. 0.60 0.05 Min. 0.020 0 Typ. 0.022 0.001 0.008 0.010 0.118 0.080 0.118 0.048 0.018 0.016 0.020 0.012 0.124 0.083 0.124 0.052 Max. 0.024 0.002 inch.
8085116/A
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Package mechanical data
STOD02
Tape & reel QFNxx/DFNxx (3x3) mechanical data
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 3.3 3.3 1.1 4 8 12.8 20.2 99 101 14.4 0.130 0.130 0.043 0.157 0.315 TYP MAX. 330 13.2 0.504 0.795 3.898 3.976 0.567 MIN. TYP. MAX. 12.992 0.519 inch
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Package mechanical data
Figure 23. DFN12L (3 x 3 mm) footprint recommended data
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Revision history
STOD02
10
Table 12.
Date
Revision history
Document revision history
Revision 1 2 3 Initial release. Added: pin description exposed pad Table 2 on page 4. Modified: Table 2 on page 4. Changes
05-Dec-2008 15-Dec-2008 30-Jun-2009
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