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October 2004
s
VERY LOW DROPOUT VOLTAGE
(TYP. 0.4V AT 800mA)
s
GUARANTEED OUTPUT CURRENT UP TO
800mA
s
FIXED AND ADJUSTABLE OUTPUT
VOLTAGE (
1% AT 25C)
s
INTERNAL CURRENT AND THERMAL LIMIT
s
LOGIC CONTROLLED ELECTRONIC
SHUTDOWN
DESCRIPTION
The LD29080 is a high current, high accuracy,
low-dropout voltage regulators series. These
regulators feature 400mV dropout voltages and
very low ground current. Designed for high current
loads, these devices also find applications in lower
current, extremely low dropout-critical systems,
where their tiny dropout voltage and ground
current values are important attributes. Typical
application are in Power supply switching post
regulation, Series power supply for monitors,
Series power supply for VCRs and TVs, Computer
Systems and Battery powered systems.
LD29080
SERIES
800mA FIXED AND ADJUSTABLE OUTPUT
VERY LOW DROP VOLTAGE REGULATOR
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
Figure 1: Schematic Diagram For Adjustable Version
SOT-223
DPAK
PPAK
PRELIMINARY DATA
Rev. 1
LD29080 SERIES
2/21
Figure 2: Schematic Diagram For Fixed Version
Table 1: Ordering Codes
(*) Available in Tape & Reel with the suffix "R", for the adj version "-R"
(**) Available on Request
Table 2: Absolute Maximum Ratings
(*) Above 14V the device is automatically in shut-down.
Absolute Maximum Ratings are those beyond which damage to the device may occur. Functional operation under these condition is not im-
plied.
DPAK (*)
PPAK (*)
SOT-223
OUTPUT VOLTAGE
LD29080DT15
LD29080PT15
LD29080S15
1.5 V
LD29080DT18
LD29080PT18
LD29080S18
1.8 V
LD29080DT25
LD29080PT25
LD29080S25
2.5 V
LD29080DT33
LD29080PT33
LD29080S33
3.3 V
LD29080DT50
LD29080PT50
LD29080S50
5.0 V
LD29080DT80
LD29080PT80
LD29080S80
8.0 V (**)
LD29080DT90
LD29080PT90
LD29080S90
9.0 V (**)
LD29080PT
ADJ
Symbol
Parameter
Value
Unit
V
I
DC Input Voltage
30 (*)
V
V
INH
Inhibit Input Voltage
14
V
I
O
Output Current
Internally Limited
mA
P
D
Power Dissipation
Internally Limited
mW
T
stg
Storage Temperature Range
-55 to 150
C
T
op
Storage Temperature Range
-40 to 125
C
LD29080 SERIES
3/21
Table 3: Thermal Data
Figure 3: Pin Connection (top view)
Table 4: Pin Description
* Not internally pulled up; in order to assure the operating condition (device in ON mode), it must be connected to a positive voltage higher
than 2V.
** Not connect for fixed version.
Symbol
Parameter
DPAK
PPAK
SOT-223
Unit
R
thj-case
Thermal Resistance Junction-case
8
8
15
C/W
R
thj-amb
Thermal Resistance Junction-ambient
100
100
C/W
Symbol
PPAK
DPAK
SOT-223
V
I
2
1
1
GND
3
2
2
V
O
4
3
3
ADJ/N.C.**
5
INHIBIT*
1
PPAK
DPAK
SOT-223
LD29080 SERIES
4/21
Figure 4: Application Circuit
* Only for version with inhibit function.
Table 5: Electrical Characteristics Of LD29080#15
(I
O
= 10mA (Note 4), T
J
= 25C, V
I
= 3.5V, V
INH
= 2V, C
I
= 330nF, C
O
= 10
F, unless otherwise specified)
NOTE 1: Guaranteed by design.
NOTE 2: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value with V
O
+1V
applied to V
I
.
NOTE 3: Reference Voltage is measured between output and GND pins, with ADJ PIN tied to V
OUT
.
NOTE 4: in order to avoid any output voltage rise within the whole operating temperature range, due to output leakage current, a minimum
load current of 2mA is required.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
I
Operating Input Voltage
I
O
= 10mA to 800mA
2.5
13
V
V
O
Output Voltage
I
O
= 10mA to 800mA, V
I
= 3 to 7V
T
J
= -40 to 125C
1.485
1.5
1.515
V
1.463
1.537
V
O
Load Regulation
I
O
= 10mA to 800mA
0.2
1.0
%
V
O
Line Regulation
V
I
= 3 to 13V
0.06
0.5
%
SVR
Supply Voltage Rejection
f = 120 Hz, V
I
= 3.5
1V, I
O
= 400mA
(Note 1)
65
75
dB
I
q
Quiescent Current
I
O
= 10mA,
T
J
= -40 to 125C
2
5
mA
I
O
= 400mA,
T
J
= -40 to 125C
8
20
I
O
= 800mA,
T
J
= -40 to 125C
14
35
V
I
= 13V, V
INH
= GND T
J
= -40 to 125C
130
180
A
I
sc
Short Circuit Current
R
L
= 0
1.2
A
V
IL
Control Input Logic Low
OFF MODE
T
J
= -40 to 125C
0.8
V
V
IH
Control Input Logic High
ON MODE
T
J
= -40 to 125C
2
V
I
INH
Control Input Current
V
INH
= 13V
T
J
= -40 to 125C
5
10
A
eN
Output Noise Voltage
B
P
= 10Hz to 100KHzI
O
= 100mA
60
V
RMS
R
1
V
O
= V
REF
(1 +
)
R
2
LD29080 SERIES
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Table 6: Electrical Characteristics Of LD29080#18
(I
O
= 10mA (Note 4), T
J
= 25C, V
I
= 3.5V, V
INH
= 2V, C
I
= 330nF, C
O
= 10
F, unless otherwise specified)
NOTE 1: Guaranteed by design.
NOTE 2: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value with V
O
+1V
applied to V
I
.
NOTE 3: Reference Voltage is measured between output and GND pins, with ADJ PIN tied to V
OUT
.
NOTE 4: in order to avoid any output voltage rise within the whole operating temperature range, due to output leakage current, a minimum
load current of 2mA is required.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
I
Operating Input Voltage
I
O
= 10mA to 800mA
2.5
13
V
V
O
Output Voltage
I
O
= 10mA to 800mA, V
I
= 3 to 7.3V
T
J
= -40 to 125C
1.782
1.8
1.818
V
1.755
1.845
V
O
Load Regulation
I
O
= 10mA to 800mA
0.2
1.0
%
V
O
Line Regulation
V
I
= 3 to 13V
0.06
0.5
%
SVR
Supply Voltage Rejection
f = 120 Hz, V
I
= 3.8
1V, I
O
= 400mA
(Note 1)
62
72
dB
V
DROP
Dropout Voltage
I
O
= 150mA,T
J
= -40 to 125C (Note 2)
0.1
V
I
O
= 400mA,T
J
= -40 to 125C (Note 2)
0.2
I
O
= 800mA,T
J
= -40 to 125C (Note 2)
0.4
0.7
I
q
Quiescent Current
I
O
= 10mA,
T
J
= -40 to 125C
2
5
mA
I
O
= 400mA,
T
J
= -40 to 125C
8
20
I
O
= 800mA,
T
J
= -40 to 125C
14
35
V
I
= 13V, V
INH
= GND T
J
= -40 to 125C
130
180
A
I
sc
Short Circuit Current
R
L
= 0
1.2
A
V
IL
Control Input Logic Low
OFF MODE
T
J
= -40 to 125C
0.8
V
V
IH
Control Input Logic High
ON MODE
T
J
= -40 to 125C
2
V
I
INH
Control Input Current
V
INH
= 13V
T
J
= -40 to 125C
5
10
A
eN
Output Noise Voltage
B
P
= 10Hz to 100KHzI
O
= 100mA
72
V
RMS
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