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LDR1833 LDR2533
Very low drop dual voltage regulator
Features

Output current 1 up to 500 mA Output current 2 up to 1.0 A Low dropout voltage 1 (0.3 V @ IO = 500 mA) Low dropout voltage 2 (0.4 V @ IO = 1 A) Very low supply current (typ. 50 A in OFF mode, 1.6 mA max in ON mode) Logic-controlled electronic shutdown output voltage availability for each regulator: 1.8 V, 2.5 V, 3.3 V Internal current and thermal limit Stable with low value (min. 4.7 F) and low ESR output capacitors Supply voltage rejection: 70 dB (typ.) Temperature range (- 40 C to 125 C)
PPAK

Description
The LDR1833, LDR2533 is a very low drop dual voltage regulator available in PPAK. The very low drop-voltage (0.5 V) and the very low supply current make it particularly suitable for low noise and low power applications such as PDA, Microdrive and other data storage applications while the used high voltage technology makes this device suitable for consumer applications such as Monitors and Set-top-box. For each VO a shutdown logic control function is available (TTL compatible) to decrease the total power consumption.
Table 1.
Device summary
Output voltages Order codes VO1 LDR1833PT-R LDR2533PT-R 1.8 V 2.5 V Rev 3 VO2 3.3 V 3.3 V 1/16
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April 2008
Contents
LDR1833 - LDR2533
Contents
1 2 3 4 5 6 7 8 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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LDR1833 - LDR2533
Diagram
1
Figure 1.
Diagram
Block diagram
VI1
POWER 1
VO1
INH1
START UP 1
BAND GAP 1
DRIVER 1
+ ERROR AMPLIFIER 1
THERMAL 1
THERMAL 2
+ ERROR AMPLIFIER 2
INH2
START UP 2
BAND GAP 2
DRIVER 2
VI2
POWER 2
VO2
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Pin configuration
LDR1833 - LDR2533
2
Figure 2.
Pin configuration
Pin connections (top view)
PPAK
Table 2.
Pin n 3 2 1 4 5
Pin description
Symbol GND VI1 VI2 VO1 VO2 Ground pin Input 1 supply pin. Bypass with a 2.2F capacitor to GND Input 2 supply pin. Bypass with a 2.2F capacitor to GND Output 1 pin. Bypass with a 4.7F capacitor to GND port Output 2 pin. Bypass with a 4.7F capacitor to GND port Name and function
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LDR1833 - LDR2533
Maximum ratings
3
Table 3.
Maximum ratings
Absolute maximum ratings
Parameter DC input voltage Shutdown voltage Output current Power dissipation Storage temperature range Operating ambient temperature range Value -0.3 to 15 -0.3 to 15 Internally limited Internally limited -50 to +150 -40 to +125 C C Unit V V
Symbol VI1 & VI2 INH IO PD TSTG TA
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-case PPAK 8 Unit C/W
Table 4.
Symbol RthJC
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Typical application
LDR1833 - LDR2533
4
Figure 3.
Typical application
Typical application circuit
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LDR1833 - LDR2533
Electrical characteristics
5
Table 5.
Electrical characteristics
Electrical characteristics (VI1 = VO1 + 2 V, VI2 = VO2 + 2 V, VINH1 = VINH2 = 2.5 V, CI1,2 = 2.2 F, CO1,2 = 4.7 F, IO1 = IO2 = 10 mA, TA = -40 C to 125 C, unless otherwise specified. Typical values are referred at TA = 25 C)
Parameter Output voltage 1 Output voltage 2
(1)
Symbol VO1 VO2
Test conditions
Min. -5 -5
Typ. VNOM1 VNOM2 0.3 0.4 15 15 10 60 2 1 30
Max. +5 +5 0.7 0.8 30 40
Unit %V %V V V mV mV mV mV mA mA mA mA A V
VDROP1 Dropout voltage 1 VO1 VO2 VO1 VO2 ISTOT IS IQMAX ISC1 ISC2 VINH-H VINH-L IINH SVR eN
IO1 = 500mA IO2 = 1A VI1 = VO1+2V to VO1+7V, IO = 250mA VI2 = VO2+2V to VO2+7V, IO = 500mA VI1 = VO1+2V, IO1 = 10 to 500mA VI2 = VO2+2V, IO2 = 10mA to 1A IO1 = IO2 = NO LOAD NO LOAD IO1 = 500mA, IO2 = 1A TA = 25 TA = 25 500 1 2.4
VDROP2 Dropout voltage 2 (1) Line regulation 1 Line regulation 2 Load regulation 1 Load regulation 2 Total supply current 1 channel supply current Quiescent current Short circuit current 1 Short circuit current 2 Enable voltage HIGH Enable voltage LOW Enable pin current Supply voltage rejection (2) RMS output noise (2)
800 1.6
0.8 VINH = 5V VI1,2 = VO1,2 +3V 1V, IO1,2 = 10 mA, f = 120Hz Bandwidth of 10Hz to 100kHz 6 70 0.003
V A dB %VO
1. This test is not performed for VO < 2.5 V. 2. Guaranteed by design, but not tested in production
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Typical characteristics
LDR1833 - LDR2533
6
Figure 4.
Typical characteristics
(unless otherwise specified TJ = 25 C) Dropout voltage (VO1) vs Figure 5. temperature Dropout voltage (VO2) vs temperature
Figure 6.
Dropout voltage (VO1) vs temperature
Figure 7.
Dropout voltage (VO2) vs temperature
Figure 8.
Line regulation (VO1) vs temp.
Figure 9.
Load regulation (VO1) vs temp.
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LDR1833 - LDR2533
Typical characteristics
Figure 10. Line regulation (VO2) vs temperature
Figure 11. Load regulation (VO2) vs temperature
Figure 12. Short circuit current (VO1) vs drop voltage
Figure 13. Short circuit current (VO2) vs drop voltage
Figure 14. Inhibit voltage vs temperature
Figure 15. One channel inhibit current vs temperature
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Typical characteristics
LDR1833 - LDR2533
Figure 16. Supply voltage rejection vs (VO1) temperature
Figure 17. Supply voltage rejection vs (VO2) temperature
Figure 18. Supply voltage rejection (VO1) vs frequency
Figure 19. Supply voltage rejection (VO2) vs frequency
Figure 20. Maximum total quiescent current vs Figure 21. Total supply current vs temperature temperature
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LDR1833 - LDR2533 Figure 22. Quiescent current (VO1) vs output current
Typical characteristics Figure 23. Quiescent current (VO2) vs output current
Figure 24. Thermal protection vs VO1
Figure 25. Load transient
CI1,2=1F, CO1,2=2.2F, VINH1,2=2.5V, VI1=4.5V, VI2=5.3V, IO1=5mA to 0.5A, IO2=5mA to 1A, tRISE=tFALL=4.2s
Figure 26. Line transient VO1,2
Figure 27. Start up transient VO1
CI1,2=0, CO1,2=2.2F, VI1=4.4 to 10.4V, VI2=5.3 to 11.3V, IO1=0.25A, IO2=0.5A, tRISE=tFALL=4.4s
VI1=1.1 to 8.5V, VI2=1.2 to 9.8V, IO1=0.25A, IO2=0.5A, tRISE=5s
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Package mechanical data
LDR1833 - LDR2533
7
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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LDR1833 - LDR2533
Package mechanical data
PPAK mechanical data
mm. Dim. Min. A A1 A2 B B2 C C2 D D1 E E1 e G G1 H L2 L4 L5 L6 0.6 1 2.8 4.9 2.38 9.35 0.8 6.4 4.7 1.27 5.25 2.7 10.1 1 1 0.023 0.039 0.110 0.193 0.093 0.368 0.031 2.2 0.9 0.03 0.4 5.2 0.45 0.48 6 5.1 6.6 0.252 0.185 0.050 0.206 0.106 0.397 0.039 0.039 Typ. Max. 2.4 1.1 0.23 0.6 5.4 0.6 0.6 6.2 Min. 0.086 0.035 0.001 0.015 0.204 0.017 0.019 0.236 0.201 0.260 Typ. Max. 0.094 0.043 0.009 0.023 0.212 0.023 0.023 0.244 inch.
0078180-E
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Package mechanical data
LDR1833 - LDR2533
Tape & reel DPAK-PPAK mechanical data
mm. Dim. Min. A C D N T Ao Bo Ko Po P 6.80 10.40 2.55 3.9 7.9 6.90 10.50 2.65 4.0 8.0 12.8 20.2 60 22.4 7.00 10.60 2.75 4.1 8.1 0.268 0.409 0.100 0.153 0.311 0.272 0.413 0.104 0.157 0.315 13.0 Typ. Max. 330 13.2 0.504 0.795 2.362 0.882 0.2.76 0.417 0.105 0.161 0.319 0.512 Min. Typ. Max. 12.992 0.519 inch.
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LDR1833 - LDR2533
Revision history
8
Table 6.
Date
Revision history
Document revision history
Revision 2 3 Changes Modified: tables 1, 3, 5 and figures 3, 6, 10, 11, 14, 17, 22, 23. Modified: Table 1 on page 1.
03-Aug-2004 15-Apr-2008
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LDR1833 - LDR2533
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