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 %
■
PDAs
■
Pulse skipping mode in light load condition
(IO < 10 mA)
■
Camcorders and digital still cameras
■
1.6 MHz PWM mode control switching
frequency (IO > 10 mA)
Description
■
Enable pin for shutdown mode
■
Low quiescent current: < 1 µA 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)
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 µA. 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.
DFN12L (3 x 3 mm)
Applications
■
Active matrix organic LED power supply
(AMOLED)
■
Mobile phones
Table 1.
June 2009
Device summary
Order code
Package
Packaging
STOD02PUR
DFN12L (3 x 3 x 0.8 mm)
3000 parts per reel
STOD02TPUR
DFN12L (3 x 3 x 0.6 mm)
3000 parts per reel
Doc ID 15245 Rev 3
1/23
www.st.com
23
Contents
STOD02
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
S-wire protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8
Demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2/23
Doc ID 15245 Rev 3
STOD02
Diagram
1
Diagram
Figure 1.
Block diagram
Doc ID 15245 Rev 3
3/23
Pin configuration
STOD02
2
Pin configuration
Figure 2.
Pin connections (top view)
Table 2.
Pin description
Pin n°
Symbol
1
LX1
2
PGND
3
VO1
Step up converter output voltage
4
NC
Not connected
5
AGND
Signal ground pin. This pin must be connected to power ground pin
6
VREF
External voltage reference
7
S-wire
Negative voltage setting pin, uses S-wire protocol
8
EN
Enable control pin. ON = VI. When pulled low, the device goes in shutdown mode
9
VO2
Inverting converter output voltage
10
LX2
Switching node of the inverting converter
11
VINA
Analog input supply voltage
12
VINP
Power input supply voltage
exposed
pad
4/23
Description
Switching node of the step up converter
Power ground pin
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.
Doc ID 15245 Rev 3
STOD02
Maximum ratings
3
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
VINA, VINP
DC supply voltage
-0.3 to 6
V
EN,S-wire
Enable pin, S-wire pin
-0.3 to 6
V
ILX2
Inverting converter’s switching current
Internally limited
A
LX2
Inverting converter switching node
-10 to VINP+0.3
V
VO2
Inverting converter output voltage
-10 to GND+0.3
V
VO1
Step-up converter output voltage
-0.3 to 6
V
LX1
Step-up converter switching node
-0.3 to VO1+0.3
V
ILX1
Step up converter’s switching current
Internally limited
A
VREF
Reference voltage
-0.3 to 3
V
PD
Power dissipation
Internally limited
mW
Tst
Storage temperature range
-65 to 150
°C
TJ
Maximum junction temperature
150
°C
2
kV
ESD
ESD protection HBM
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 4.
Thermal data
Symbol
Parameter
Value
Unit
RthJA
Thermal resistance junction-ambient referred to FR-4 PCB
49.1
°C/W
RthJC
Thermal resistance junction-case
4.216
°C/W
Doc ID 15245 Rev 3
5/23
Application
STOD02
4
Application
Figure 3.
Typical application circuit
A
Table 5.
Typical external components
Symbol
Parameter
L1
Inductor
4.7
µH
L2
Inductor
4.7
µH
CIN
Ceramic capacitor SMD
4.7
µF
C01, C02
Ceramic capacitor SMD
4.7
µF
Cref
Ceramic capacitor SMD
1
µF
6/23
Doc ID 15245 Rev 3
Min.
Typ.
Max.
Unit
STOD02
5
Electrical characteristics
Electrical characteristics
TJ = 25 °C, VINA = VINP = 3.7 V, IO1,2 = 30 mA, CI = 4.7 µF, CO1,2 = 4.7 µF, CREF = 1 µF, L1 =
4.7 µH, L2 = 4.7 µH, VEN = VINA = VINP, VO1 = 4.6 V, VO2= -4.9 V unless otherwise specified.
Table 6.
Electrical characteristics
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
4.5
V
2.50
V
General section
VIN
Operating input voltage
VO1=4.6V, TJ = -40 to 85°C
range
UVLO_H
Under voltage lockout
HIGH
VINA rising, TJ = -40 to 85°C
UVLO_L
Under voltage lockout
LOW
VINA falling, TJ = -40 to 85°C
Input current
No Load condition (I_VI = IINA + IINP)
Shutdown current
VEN = GND, (IS = IINA + IINP)
VEN H
Enable high threshold
VINA= 2.5V to 4.5V, TJ = -40 to 85°C
VEN L
Enable low threshold
VINA= 2.5V to 4.5V, TJ = -40 to 85°C
IEN
Enable input current
VEN = VI
FSW
Frequency
PWM mode, TJ = -40 to 85°C
I_VI
IS
2.5
2.40
2.30
2.35
1
V
1.5
mA
1
µA
1.2
V
0.4
1.35
1.6
1
µA
1.85
MHz
D1MAX
Step-up maximum duty
cycle
90
%
D2MAX
Inverting maximum
duty cycle
90
%
ν
Total system efficiency
IO1,2=10 to 30mA, VO1=4.6V, VO2=-4.9V
80
IO1,2=30 to 150mA, VO1=4.6V,
VO2=-4.9V
85
VREF
Voltage reference
IREF=10µA
IREF
Voltage reference
current capability
At VREF = VREF – 1.5%
%
1.196
1.209
1.222
100
V
µA
Step-up converter section
VO1
ΔVO1 SL
ΔVO1 LT
Line/Load maximum
VINA=2.5V to 4.5V, IO1=5mA to 100mA
output voltage variation
Static line regulation
Line transient
(1)
4.55
4.6
VINA=2.5V to 4.5V, IO1=5mA, IO2 no load;
TJ=-40°C to 85°C
0.5
VINA=2.5V to 4.5V, IO1=100mA, IO2 no
load, TJ=-40°C to 85°C
0.5
VINA=3.5V to 3.0V, IO1=100mA
TJ=-40°C to 85°C, TR=TF=50µs output
voltage variation with respect to nominal
VO1
-12
Doc ID 15245 Rev 3
4.65
V
%
mV
7/23
Electrical characteristics
Table 6.
Symbol
ΔVO1
ΔVO1t
ΔVO1
IO1
I-L1MAX
STOD02
Electrical characteristics (continued)
Parameter
Test conditions
Static load regulation
(2)
Load transient
regulation
Min.
Typ.
IO1=5 to 100mA, IO2 no load, VINA=2.5V;
TJ=-40°C to 85°C
+1
IO1=5 to 100mA, IO2 no load, VINA=4.5V;
TJ=-40°C to 85°C
+1
IO1=3 to 30mA and IO1=30 to 3mA,
TR=TF=30µs, output voltage variation with
respect to nominal VO1
±30
IO1=10 to 100mA and IO1=100 to 10mA,
TR=TF=30µs, output voltage variation with
respect to nominal VO1
±35
Max.
Unit
%
mV
Ripple output voltage
range (peak to peak)
IO1=5 to 100mA; 0.5Vpp pulse signal
applied to VI at 200Hz; TDMA Noise
Maximum Step-up
output current
VI=2.9V to 5.5V
150
mA
Ipeak current
Vo1 below 10% of nominal value
0.9
A
20
mV
RDSONP1
TJ = -40 to 85°C
0.8
1.0
Ω
RDSONN1
TJ = -40 to 85°C
0.5
1.0
Ω
-5.9
V
-5.00
V
Inverting converter section
Output negative voltage 10 different values set by S-wire pin (see
range
Table 9)
-2.3
VO2 def.
VO2 default value
Default output voltage
-4.80
VO2 Toll.
VO2 tolerance
Output voltage variation with respect to
nominal VO selected
±2
%
VINA=2.5V to 4.5V, IO2=5mA, IO1 no load;
TJ=-40°C to 85°C
+1
%
VINA=2.5V to 4.5V, IO2=100mA, IO1 no
load, TJ=-40°C to 85°C
+1
%
VINA=3.5V to 3.0V, IO2=100mA
TJ=-40°C to 85°C, TR=TF=50µs output
voltage variation with respect to nominal
VO2
+30
mV
IO2=5 to 100mA, IO1 no load, VINA=2.5V;
TJ=-40°C to 85°C
+1
IO2=5 to 100mA, IO1 no load, VINA=4.5V;
TJ=-40°C to 85°C
+1
VO2
ΔVO2
ΔVO1 LT
ΔVO2
Static line regulation
(3)
Line transient
Static load regulation (4)
-4.9
%
ΔVO2t
Load transient
regulation
IO2=3 to 30mA and IO2=30 to 3mA,
TR=TF=30µs, output voltage variation with
respect to nominal VO2
±40
±80
mV
ΔVO2e
Load transient
regulation HC
IO2=10 to 100mA and IO2=100 to 10mA,
TR=TF=30µs
±30
±50
mV
8/23
Doc ID 15245 Rev 3
STOD02
Table 6.
Symbol
Electrical characteristics
Electrical characteristics (continued)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
25
mV
ΔVO2
Ripple output voltage
range
IO2=5 to 100mA 0.5Vpp pulse signal
applied to VI at 200Hz; TDMA Noise
IO2s
Maximum inverting
output current
VINA=2.5V to 2.9V
-120
mA
IO2
Maximum inverting
output current
VINA=2.9V to 4.5V
-150
mA
Ipeak current
VO2 below 10% of value set by S-wire
-1.2
-1.1
A
RDSONP2
TJ = -40 to 85°C
0.4
2.0
Ω
RDSONN2
TJ = -40 to 85°C
0.4
1.0
Ω
I-L2MAX
Thermal shutdown
OTP
OTPHYST
Over temperature
protection
140
°C
Over temperature
protection hysteresis
15
°C
600
Ω
6
ms
Discharge resistor
RDIS
Discharge resistor
value
TDIS
Discharge time
1. [(VO1MAX - VO1MIN) / (VO1 at 25°C and VINA = 2.5 V)] x 100
2. [(VO1MAX - VO1MIN) / (VO1 at 25°C and IO1 = 5 mA)] x 100
3. [(VO2MAX - VO2MIN) / (VO2 at 25°C and VINA = 2.5 V)] x 100
4. [(VO2MAX - VO2MIN) / (VO2 at 25°C and IO2 = 5 mA)] x 100
Doc ID 15245 Rev 3
9/23
S-wire protocol
6
S-wire protocol
Figure 4.
S-wire protocol
STOD02
.
.
.
Table 7.
Time
Rating
Enable high delay time
Symbol
Min.
Typ.
Max.
Unit
Ten_dly
300
µs
Tss1
2
ms
Toff_dly1
50
µs
VO turn-off delay
Tvo_off_dly1
12
ms
S-Wire initial time
Tih
300
400
µs
Soft-start time by S-wire enable
Tss2
2
3
ms
S-Wire High
Tsh
2
20
45
µs
S-Wire Low
Tsl
2
20
75
µs
Tstop
300
400
µs
Soft-start delay
Turn-off delay
S-Wire signal stop indicate time
VO turn-off delay by S-Wire
Twait after data
S-Wire turn-off detection time
10/23
Tvo_off_dly2
12
related to
load
ms
Twait
0
10
µs
400
µs
Toff_dly2
Doc ID 15245 Rev 3
300
STOD02
Figure 5.
S-wire protocol
Waveform
TON
TOFF
Tf
Tr
TWK
VIH
90%
VIL
10%
BIT= 1
Table 8.
BIT= 0
BIT= 0
Time
Rating
Symbol
Min.
Rising input high threshold voltage level
VIH
Falling input high threshold voltage level
VIL
Pull down resistor
Max.
Unit
1.2
VINA
V
0
0.6
V
150
RS-WIRE
Wake up delay
Typ.
kΩ
TWK
1
µs
S-Wire rising time
Tr
200
ns
S-Wire falling time
Tf
200
ns
Clocked s-wire high
TON
2
45
µs
S-wire low
TOFF
2
75
µs
400
kHz
Input S-Wire frequency
Table 9.
FS-WIRE
Inverting output voltages
Bit clock
VO2 (V)
1
-2.3
2
-2.7
3
-3.1
4
-3.5
5
-3.9
6
-4.3
7
-4.7
8
-5.1
9
-5.5
10
-5.9
Doc ID 15245 Rev 3
11/23
S-wire protocol
Table 10.
STOD02
Enable and s-wire pin settings
Enable
S-wire
Action
0
0
Device off
0
1
Output set by S-Wire
1
0
Default value output (- 4.9 V)
1
1
Default value output (- 4.9 V)
Note:
Enable pin must be set to GND while using S-wire function.
Figure 6.
Single wire programming
12/23
Doc ID 15245 Rev 3
STOD02
Typical performance characteristics
7
Typical performance characteristics
CI = CO1,2 = 4.7 µF, CREF = 1 µF, L1 = L2 = 4.7 µH, TJ = 25 °C
Figure 7.
Efficiency vs. input voltage
Figure 8.
88%
90%
86%
88%
84%
86%
84%
Efficiency
82%
Efficiency
Efficiency vs. output current
80%
78%
76%
82%
80%
78%
76%
74%
74%
IOUT=100mA
72%
72%
70%
70%
2.5
2.9
3.3
3.7
4.1
4.5
4.9
0
5.3
20
40
60
80
100
120
140
160
IOUT [mA]
VIN [V]
Efficiency values are measured using MARUWA
CXFU0208-4R7 (0.44 Ω DC resistance)
Efficiency values are measured using MARUWA
CXFU0208-4R7 (0.44 Ω DC resistance)
Figure 9.
Figure 10. Inverting inductor peak current vs.
input voltage
Step-up inductor peak current vs.
input voltage
VEN=VINA=VINP=2.3 to 6 V, VO2=below 10% of nominal value, VO1=4.6 V
I-L2MAX [A]
I-L1MAX [A]
VEN=VINA=VINP=2.3 to 4.5 V, VO1=below 10% of nominal value, VO2=-4.9 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
0
-0.2
-0.4
-0.6
-0.8
-1
-1.2
-1.4
-1.6
-1.8
-2
2
5
3
4
Figure 11. PWM step-up frequency vs.
temperature
VEN=VINA=VINP=3.7V, L1=L2=OPEN LOOP replaced by 100Ω resistor,
IO1,2=NO LOAD, VO1=+4V, VO2=-4V externally forced, TJ=-55°C to 125°C
FREQUENCY [MHz]
FREQUENCY [MHz]
2
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
-35
-15
5
25
45
65
6
Figure 12. PWM inverting frequency vs.
temperature
VEN=VINA=VINP=3.7V, L1=L2=OPEN LOOP replaced by 100Ω resistor,
IO1,2=NO LOAD, VO1=+4V, VO2=-4V externally forced, TJ=-55°C to 125°C
-55
5
INPUT VOLTAGE [V]
INPUT VOLTAGE [V]
85
105
125
2
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
-55
TEMPERATURE [°C]
-35
-15
5
25
45
65
85
105
125
TEMPERATURE [°C]
Doc ID 15245 Rev 3
13/23
Typical performance characteristics
STOD02
Figure 13. Quiescent current vs. temperature
Figure 14. Input current vs. temperature
1.500
0.650
1.400
INPUT CURRENT [mA]
0.550
Iq [µA]
0.450
0.350
0.250
0.150
1.300
1.200
1.100
1.000
0.900
0.800
0.050
-40
-15
10
35
60
-40
85
-15
10
35
60
85
TEMP [°C]
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=50µs
VEN=VINA=VINP=3.5V to 3V, IO1=NO LOAD, IO2=100mA,
VO1=4.6V, VO2=-4.9V, TR=TF=50µs
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=30µs
14/23
VEN=VINA=VINP=3.7V, IO2=3 to 30mA & IO2=30 to 3mA,
VO1=4.6V, VO2=-4.9V, IO1=NO LOAD, TR=TF=30µs
Doc ID 15245 Rev 3
STOD02
Typical performance characteristics
Figure 19. Fast discharge
VEN
V02
V01
Doc ID 15245 Rev 3
15/23
Demonstration board
8
STOD02
Demonstration board
Figure 20. Suggested demonstration board schematic (top layer view)
Figure 21. Suggested demonstration board schematic (bottom layer view)
16/23
Doc ID 15245 Rev 3
STOD02
9
Package mechanical data
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Table 11.
DFN12L (3 x 3 x 0.8 mm) mechanical data
mm.
Dim.
Min.
Typ.
Max.
A
0.70
0.75
0.80
A1
0
0.02
0.05
A3
0.20
b
0.18
0.25
0.30
D
2.85
3
3.15
D2
1.87
2.02
2.12
E
2.85
3
3.15
E2
1.06
1.21
1.31
e
L
0.45
0.30
0.40
Doc ID 15245 Rev 3
0.50
17/23
Package mechanical data
STOD02
Figure 22. Drawing dimension DFN12L (3 x 3 x 0.8 mm)
8065043-A
18/23
Doc ID 15245 Rev 3
STOD02
Package mechanical data
DFN12L (3 x 3 x 0.6 mm) mechanical data
mm.
inch.
Dim.
Min.
Typ.
Max.
Min.
Typ.
Max.
A
0.51
0.55
0.60
0.020
0.022
0.024
A1
0
0.02
0.05
0
0.001
0.002
A3
0.20
0.008
b
0.18
0.25
0.30
0.007
0.010
0.012
D
2.85
3
3.15
0.112
0.118
0.124
D2
1.87
2.02
2.12
0.074
0.080
0.083
E
2.85
3
3.15
0.112
0.118
0.124
E2
1.06
1.21
1.31
0.042
0.048
0.052
e
L
0.45
0.30
0.40
0.018
0.50
0.012
0.016
0.020
8085116/A
Doc ID 15245 Rev 3
19/23
Package mechanical data
STOD02
Tape & reel QFNxx/DFNxx (3x3) mechanical data
mm.
inch
DIM.
MIN.
TYP
A
MIN.
TYP.
330
C
12.8
D
20.2
N
99
13.2
MAX.
12.992
0.504
0.519
0.795
101
T
20/23
MAX.
3.898
3.976
14.4
0.567
Ao
3.3
0.130
Bo
3.3
0.130
Ko
1.1
0.043
Po
4
0.157
P
8
0.315
Doc ID 15245 Rev 3
STOD02
Package mechanical data
Figure 23. DFN12L (3 x 3 mm) footprint recommended data
Doc ID 15245 Rev 3
21/23
Revision history
STOD02
10
Revision history
Table 12.
Document revision history
Date
Revision
05-Dec-2008
1
Initial release.
15-Dec-2008
2
Added: pin description exposed pad Table 2 on page 4.
30-Jun-2009
3
Modified: Table 2 on page 4.
22/23
Changes
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STOD02
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