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STOD2540
PMOLED display power supply
Feature summary

Inductor switcher boost controller. PFM mode control. High efficiency over wide range of load (1mA to 40mA). Integrated Load disconnect switch. Over voltage protection with automatic restart Soft start with adjustable peak current limit Enable pin Low shutdown current. Small external inductor. Supply voltage from 3.0V to 5.5V STOD2540 is a boost converter that operates from 3.0V to 5.5V and can provide an output voltage as high as 25V. The output current capability is maximum 40mA up to 25V output voltage. The regulation is performed by a resistor divider network (Figure 3.) that detects the output voltage. In this state-of-the-art boost converter, a DC current path exists between the battery source and the load. In order to reduce the consumption in Shutdown mode, a high-side load isolation switch is necessary to cut this DC current path in Standby mode. The Load Disconnect Switch (LDS) actsas an isolation switch in Shutdown mode.
QFN8 (3mm x 3mm)
Application
PMOLED display driver
Description
STOD2540 is dedicated to Passive Matrix OLED (PMOLED) displays for portable handsets and provides the pre-charge and biasing voltage of the column matrix driver as shown in Figure 3. The current capability of STOD2540 allows feeding a 1", 1.3" or 1.5" color PMOLED.
Order codes
Part number STOD2540PMR September 2006 Package QFN8 (3mm x 3mm) Rev. 5 Packaging 4500 parts per reel 1/19
www.st.com
19
STOD2540
Contents
1 2 3 4 5 Schematic diagram ......................................... 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 5.2 5.3 5.4 5.5 5.6 5.7 Boost controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Adjustable peak inductor current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 OVP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Load isolation switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Under voltage lockout (UVLO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1 Demoboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 8 9
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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STOD2540
Schematic diagram
1
Figure 1.
Schematic diagram
Block diagram
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Pin configuration
STOD2540
2
Figure 2.
Pin configuration
Pin connections (top view)
Table 1.
PlN N 1 2 3 4 5 6 7 8 9
Pin description
SYMBOL VI RSET AGND FB VO VCAP ENABLE VSW PGND Supply voltage Peak inductor current adjust Analog Ground Feedback for the LED current regulation Output voltage for LED supply Load Disconnect Switch input IC enable signal Boost switch drain Power Ground NOTE
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STOD2540
Maximum ratings
3
Table 2.
Symbol VBSW, VBO VI RSET EN VESD TSTG TOP
Maximum ratings
Absolute maximum ratings
Parameter Breakdown voltage at OUT and SW pin Supply voltage range RSET pin Enable pin ESD ratings, HBM MIL STD 883C Storage Temperature Range Operating Junction Temperature Range Value 40 6 VI + 0.3 VI + 0.3 2 -65 to 150 -40 to 85 Unit V V V V kV C C
Table 3.
Symbol RthJA
Thermal Data
Parameter Thermal Resistance Junction-Ambient Value 52 Unit C/W
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Electrical characteristics
STOD2540
4
Table 4.
Electrical characteristics
Electrical characteristics (TJ = 40C to 85C, VI = 3.6V, VEN = 3V, CI = CO = 4.7F, L = 4.7H, R1 = 180k R2 = 10k , , VO = 24V, Typ. values @ 25C, unless otherwise specified).
Parameter Input voltage range Regulated output voltage Over voltage protection on output Continuous output current Stand-by current VO = 25V VEN = Low, VI = 3.6V VEN = Low, VI = 3V to 4.2V Quiescent current consumption Boost switch RDSON Note: 1 BVDS Breakdown voltage RDSON Note: 1 BVDS Breakdown voltage Peak inductor limit range Note: 1 RSET = 10k to 100k VO = 25V, IO = 30mA 40 0.2 0.75 1.18 1.24 5.5 300 65 70 65 70 1.3 1.3 1.3 1.3 2 V % % 1.1 1.2 1.30 VI = 3V to 4.2V @ 25C VI = 5.5V @ 25C VI = 4.2V, ISW = 100mA 40 2 0.4 0.8 0.4 VI = 3V to 5.5V Test Min. 3.0 VI + 0.5 35 1 40 3 A 10 0.8 mA 1.2 V V A A V s ns 25 Typ. Max. 5.5 35 Unit V V V mA
Symbol VI VO VOVP IO ISD
IQ
RDSON-SW
RDSON-LDS ILIM-ADJ ILIM-MAX FB TON_MAX TOFF_MIN
Maximum peak inductor current VI = 3V to 5.5V, RSET = VI Note: 1 Feedback voltage Maximum ON Time Minimum OFF Time Efficiency, VI = 3.6V Note: 1 5% @ 25C VI = 4.2V VI = 4.2V IO = 1 mA to 5mA IO = 5 mA to 40mA IO = 1 mA to 5mA IO = 5 mA to 40mA VI = 3.6V, IO = 5 mA, VO = 24V
Eff Efficiency, VI =4.2V Note: 1
Ripple
Output ripple and noise
VI = 3.6V, IO = 30 mA, VO = 24V VI = 4.2V, IO = 5 mA, VO = 24V VI = 4.2V, IO = 30 mA, VO = 24V
OVHYST
Overvoltage hysteresis
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STOD2540 Table 4.
Electrical characteristics Electrical characteristics (TJ = 40C to 85C, VI = 3.6V, VEN = 3V, CI = CO = 4.7F, L = 4.7H, R1 = 180k R2 = 10k , , VO = 24V, Typ. values @ 25C, unless otherwise specified).
Parameter Enable input logic low Test Disable Low VIL Enable High VIH VI = 3V to 5.5V, IO = 5 mA VI = 3V to 5.5V, IO = 5 mA 1.2 5 5 35 35 mV mV Min. Typ. Max. 0.3 V Unit
Symbol VEN Line_VFB Load_VFB
Enable input logic high Line regulation VFB Line regulation VFB
Note:
1
Guaranteed by design.
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Functional description
STOD2540
5
5.1
Functional description
Boost controller
STOD2540 is a boost converter operating in PFM (pulsed frequency modulation) mode. The converter monitors the output voltage through the bridge resistor divider R1 and R2 and when the feedback voltage falls below the reference voltage, REF2, the boost switch tSW turns ON and the current ramps up. The inductor current is measured by detect the temperature compensated drain voltage of the boost MOSFET. The boost turns off when its drain voltage reaches the reference REF1, the main switch remains off until the minimum off time (300ns typical) has passed and the feedback voltage is below the reference again. A maximum ON time of 4s prevent the switch tSW to stay ON during a too long period of time. In order to well calculate the bridge resistors values with a fixed VO, the following formula can be used:
5.2
Adjustable peak inductor current limit
The peak inductor current is monitored by sensing the drain voltage of the switch tSW. Since it exceeds the temperature compensated and supply voltage compensated reference REF1, the RS Flip flop is reset and tSW is turned OFF. By connecting a resistance between the pin RSET and GND, the peak current limit can be adjusted from 200mA to 1.1A (RSET from 10k to 100k). When the pin RSET is directly connected to VI, the default value is 1A.
5.3
Enable
The ENABLE pin is a high logic input signal and allows turning on/off the controller without cutting the input voltage from the boost regulator circuit. With a high input voltage (1.2V 5.4
OVP
If the regulation loop is cut, there is no signal at the feedback pin, the PFM controller will then continue to switch without control and generate an output voltage at the SW, VCAP and VO pin exceeding the breakdown value VBSW, VBCAP and VBO. The Over Voltage Protection (OVP) senses the voltage at the VCAP pin.When the voltage exceed the breakdown voltage of the device the controller is automatically turned Off. A hysteresis control enables the device to automatically restart when the output voltage drops below a 2V typical value.
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STOD2540
Functional description
5.5
Load isolation switch
When the device is in Shutdown mode, a DC current path always exists between the power source and the load; increasing the standby consumption. A high side switch LDS isolates the load from the source when the STOD2540 is disabled.
5.6
Efficiency
The total consumption of some PMOLED display, can be as low as 1mA. In order to increase the battery run time of the device, STOD2540 offers a high efficiency over a wide range of load and input voltage range.
5.7
Under voltage lockout (UVLO)
The minimum supply voltage is 3.0 V, under this value the undervoltage lockout circuit operates with typical threshold 2.8V. When supply voltage is below 3.0V, possible noise in the supply line could disturb the UVLO circuit causing loss of output regulation. This behavior is eliminated choosing CI = 10F or higher.
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Typical application
STOD2540
6
Figure 3.
Typical application
Basic Connection
Table 5.
Symbol
External components (see fig. 3 and note)
Parameter VRRM Test Min. 30 0.5 30 180 10 IPK = 200mA to 1.1A Ceramic Type Capacitance 4.7 42 1.6 4.7 1 10 4.7 100 F F V H A k Typ. Max. Unit V V A
D
Boost schottky diode
VF at IF = 300mA, TJ = 25C IR at VR = 10V, TJ = 25C
R1 R2 RSET CI
Feedback resistor Feedback resistor Peak current limit adjust Input ceramic type low ESR Output capacitance: ceramic low ESR
CO
Voltage ESR Inductance
L
Boost inductor (height < 2mm)
ISAT, RSET pin to VI
Note:
The external components suggested in this document should be considered as a design reference guide. The performances mentioned in the electrical characteristics table are not guaranteed for all the possible electrical parameters of the components included in this list. On other hand, the operation of STOD2540 is not limited to the use of components included in this list.
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STOD2540
Typical application
6.1
Figure 4.
Demoboard
Suggested demoboard schematic (Top layer view)
11/19
Typical performance characteristics
STOD2540
7
Typical performance characteristics
(TJ = 40C to 85C, VI = 3.6V, VEN = 3V, CI = CO = 4.7F, L = 4.7H, R1 = 180k R2 = 10k , , VO = 24V, Typ. values @ 25C, unless otherwise specified)
Figure 5.
Efficiency vs output current
Figure 6.
Efficiency vs input voltage
Figure 7.
VEN vs temperature
Figure 8.
VFB vs input voltage
Figure 9.
VFB vs output current
Figure 10. VFB vs output current
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STOD2540
Typical performance characteristics
Figure 11. VOVP vs temperature
Figure 12. VRIPPLE vs input voltage
Figure 13. ILIM_MAX vs input voltage
Figure 14. ILIM_MAX vs temperature
Figure 15. ILIM_MAX vs RSET
Figure 16. IQ vs temperature
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Typical performance characteristics Figure 17. tON_MAX vs temperature Figure 18. tOFF_MIN vs temperature
STOD2540
Figure 19. Line VFB vs temperature
Figure 20. Load VFB vs temperature
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STOD2540
Package mechanical data
8
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
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Package mechanical data
STOD2540
QFN8 (3x3) MECHANICAL DATA
DIM. A A1 A2 A3 b b1 D D2 E E2 e K L L1 L2 r r1 0.15 0.15 0.20 0.20 0.16 0.29 0.24 0.45 0.40 0.13 0.006 0.006 1.11 1.92 0.65 0.15 0.29 0.17 3.00 2.02 3.00 1.21 0.65 0.008 0.008 0.006 0.011 0.009 0.018 0.016 0.005 1.31 0.044 2.12 0.076 mm. MIN. 0.80 TYP 0.90 0.03 0.70 0.20 0.31 MAX. 1.00 0.05 0.75 0.25 0.39 0.30 0.026 0.006 0.011 0.007 0.118 0.080 0.118 0.048 0.026 0.052 0.084 MIN. 0.032 inch TYP. 0.035 0.001 0.028 0.008 0.012 MAX. 0.039 0.002 0.030 0.010 0.015 0.012
7517789
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STOD2540
Package mechanical data
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 60 18.4 0.130 0.130 0.043 0.157 0.315 TYP MAX. 330 13.2 0.504 0.795 2.362 0.724 MIN. TYP. MAX. 12.992 0.519 inch
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Revision history
STOD2540
9
Table 6.
Date
Revision history
Revision history
Revision 1 2 3 4 5 Initial release. Add fig. 2 demoboard on page 3. Description in cover page updated. Change range of RSET value and add description paragraph 5.7. Mistake on table 4 Ripple test value 3.6V ==> 4.2V. Changes
22-Mar-2006 03-Apr-2006 08-Jun-2006 23-Jun-2006 11-Sep-2006
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STOD2540
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