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LDR1833STN/a150avaiVERY LOW DROP DUAL VOLTAGE REGULATOR
LDR2533-PT |LDR2533PTSTN/a5000avaiVERY LOW DROP DUAL VOLTAGE REGULATOR


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LDR1833-LDR2533-PT
VERY LOW DROP DUAL VOLTAGE REGULATOR
1/13August 2004 OUTPUT CURRENT 1 UP TO 500mA OUTPUT CURRENT 2 UP TO 1.0A LOW DROPOUT VOLTAGE 1
(0.3V @ IO =500mA) LOW DROPOUT VOLTAGE 2
(0.4V @ IO =1A) VERY LOW SUPPLY CURRENT (TYP.50µA
IN OFF MODE, 1.6mA MAX IN ON MODE) LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN OUTPUT VOLTAGE AVAILABILITY FOR
EACH REGULATOR: 1.8V, 2.5V, 3.3V INTERNAL CURRENT AND THERMAL LIMIT STABLE WITH LOW VALUE (MIN 4.7µF)
AND LOW E.S.R. OUTPUT CAPACITORS SUPPLY VOLTAGE REJECTION: 70dB (TYP.) TEMPERATURE RANGE (-40°C TO 125°C)
DESCRIPTION

The LDRxxyy is a Very Low Drop Dual Voltage
Regulator available in PPAK for the version
without inhibit and in SPAK-7L for the version with
the shutdown feature. The very low drop-voltage
(0.5V) 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.
LDRxxyy

VERY LOW DROP
DUAL VOLTAGE REGULATOR
Figure 1: Block Diagram

Rev. 2
LDRxxyy
2/13
Table 1: Absolute Maximum Ratings

Absolute Maximum Rating are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
Table 2: Thermal Data
Figure 2: Connection Diagram (top view)
Table 3: Pin Description
Table 4: Order Codes
LDRxxyy
3/13
Table 5: Electrical Characteristics (V
I1 = VO1 +2V, VI2 = VO2 +2V, V INH1 = V INH2 = 2.5V, I1,2 = 2.2μF, C O1,2 = 4.7μF, IO1 = IO2 = 10mA, TA = -40°C to 125°C, unless otherwise specified. Typical
values are referred at TA = 25°C)
(1): This test is not performed for VO<2.5V.
(2): Guaranteed by design, but not tested in production.
Figure 3: Typical Application Circuit
LDRxxyy
4/13
TYPICAL CHARACTERISTICS (unless otherwise specified T
j = 25°C)
Figure 4: Dropout Voltage (V
O1 ) vs Temperature

Figure 5: Dropout Voltage (V
O2 ) vs Temperature

Figure 6: Output Voltage (V
O1 ) vs Temperature

Figure 7: Output Voltage (V
O2 ) vs Temperature

Figure 8: Line Regulation (V
O1 ) vs Temperature

Figure 9: Load Regulation (V
O1 ) vs Temperature

LDRxxyy
5/13
Figure 10: Line Regulation (V
O2 ) vs Temperature

Figure 11: Load Regulation (V
O2 ) vs
Temperature
Figure 12: Short Circuit Current (V
O1 ) vs Drop
Voltage
Figure 13: Short Circuit Current (V
O2 ) vs Drop
Voltage
Figure 14: Inhibit Voltage vs Temperature

Figure 15: One Channel Inhibit Current vs

Temperature
LDRxxyy
6/13
Figure 16: Supply Voltage Rejection vs (V
O1)
Temperature
Figure 17: Supply Voltage Rejection vs (V
O2)
Temperature
Figure 18: Supply Voltage Rejection (VO1) vs

Frequency
Figure 19: Supply Voltage Rejection (V
O2 ) vs
Frequency
Figure 20: Maximum Total Quiescent Current vs

Temperature
Figure 21: Total Supply Current vs Temperature

LDRxxyy
7/13
Figure 22: Quiescent Current (V
O1 ) vs Output
Current
Figure 23: Quiescent Current (V
O2 ) vs Output
Current
Figure 24: Thermal Protection vs V
O1

Figure 25: Load Transient

Figure 26: Line Transient V
O1,2

Figure 27: Start up Transient V
O1

CI1,2=1µF, C O1,2=2.2µF, V INH1,2=2.5V, VI1=4.5V, VI2=5.3V,
IO1=5mA to 0.5A, IO2=5mA to 1A, tRISE=tFALL=4.2µs
CI1,2=0, CO1,2=2.2µF, V I1=4.4 to 10.4V, VI2=5.3 to 11.3V,
IO1=0.25A, IO2=0.5A, tRISE=tFALL=4.4µs
VI1=1.1 to 8.5V, VI2=1.2 to 9.8V, IO1=0.25A, IO2=0.5A, tRISE=5µs

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