LD6918
11/20/2009
300mA, Low-Noise CMOS Dual LDO Regulators
REV: 02a
General Description
The LD6918 is a dual micro power linear regulator,
featuring low quiescent current, low-noise, low-dropout
and high ripple rejection ration. The precision of feedback
reference voltage is within
±1%
and output current is up to
300mA. As well, the LD6918 can be stable with a 1μF low
ESR ceramic output capacitor which reduces the board
space and cost.
The LD6918 is available in SOT23-6; WDFN-8L 3 x 3;
WDFN-8L 2 x 2 and WDFN-6L 1.6 x 1.6 packages.
Features
Wide Operating range: 2.5V to 5.5V
Low Noise for RF application
No Noise Bypass capacitor required
Low Quiescent Current: 40μA (typ.)/LDO
High Output Voltage Accuracy: ±1%
High RSRR:70dB @ 1KHz
V
OUT
Discharge Function
Very Small Inrush Current
Thermal Shutdown and Current Limiting Protection
Output Voltage : 1.5V to 3.3V
(0.1V increments, 1.85V, 2.85V, 3.15V extra)
+patented
Applications
Battery-Powered Equipment
Hand-Held Instruments
Typical Application Circuit
Fig. 1 Typical Application Circuit
1
Leadtrend Technology Corporation
LD6918-DS-02a, November 2009
www.leadtrend.com.tw
LD6918
Pin Configuration
SOT-26 (TOP VIEW)
OUT1
VIN
CE1
WDFN-8L (3x3)
OUT1
OUT2
GND
N.C
WDFN-8L (2x2)
OUT1
OUT2
N.C
GND
WDFN-6L (1.6x1.6)
OUT1
OUT2
5
2
8
7
6
5
8
7
6
5
6
6
5
4
6918xy
YYWWPPT
1
1
2
3
4
18
Y WJ
xy
1
2
3
Ixy
YWT
1
Ixy
YWT
3
VIN
CE1
CE1
VIN
OUT2 GND CE2
CE2
N.C
Y, YY
W, WW
J18
xy
PP
:
:
:
:
:
Year code (D: 2004, E: 2005..)
Week code
LD6918
Voltage code (*note)
Production dode
I
xy
W
T:
VOUT1
x
VOUT2
y
Voltage Code for x or y respectively
Standard Voltage
H
1.5
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
1
Extra Voltage
2
3
4
1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 1.85 2.65 2.85 3.15
Ex1:KZ: V
OUT1
=1.8V, V
OUT2
=3.3V;
Ex2:1U: V
OUT1
=1.85V, V
OUT2
=2.8V;
Ordering Information
Part number
LD6918 GL-xy
LD6918 GDGW-xy
LD6918 GDDW-xy
LD6918 GDAW-xy
SOT-26
WDFN-8L 3mm×3mm
WDFN-8L 2mm×2mm
WDFN-6L 1.6mm×1.6mm
Package
TOP MARK
YWJ/18xy
6918xy
Ixy
Ixy
Shipping
3000 /tape & reel
2500 /tape & reel
2500 /tape & reel
2500 /tape & reel
Note 1: The LD6918 is Green Packaged.
Note 1: xy: Dual output voltage, 1.5V~3.15V
2
Leadtrend Technology Corporation
LD6918-DS-02a, November 2009
www.leadtrend.com.tw
CE1
CE2
N.C
VIN
: LD 6918
: Voltage code
: Week code
Thickness
W: 0.75mm (normal)
CE2
2
3
4
GND
4
LD6918
Pin Descriptions
PIN Number
SOT26
5
4
3
WDFN-8
(3x3)
1
2
3
6,
2
Exposed
Pad
1
6
--
5
8
4,7
WDFN
(2x2)
1
2
3
5,
Exposed
Pad
7
8
4,6
WDFN-6
(1.6x1.6)
1
2
3
4,
Exposed
Pad
5
6
--
OUT2
OUT1
N.C.
GND
PIN
NAME
VIN
CE1
CE2
Regulator Input
OUT1 Enable, High=Enable, Low=Disable
OUT2 Enable, High=Enable, Low=Disable
IC GND, Exposed Pad should be connected to
GND plane, to provide efficient heat path
soldered directly to the PCB.
Regulator 2 Output
Regulator 1 Output
No Connected
FUNCTION
Block Diagram
3
Leadtrend Technology Corporation
LD6918-DS-02a, November 2009
www.leadtrend.com.tw
LD6918
Absolute Maximum Ratings
VIN1, VIN2, OUT1, OUT2, BP Pin
CE1, CE2 Pin
Power dissipation SOT26@T
A
=25
°
C
Power dissipation WDFN-8L 3×3 @T
A
=25
°
C
Power dissipation WDFN-8L 2×2 @T
A
=25
°
C
Power dissipation WDFN-6L 1.6×1.6 @TA=25°C
Package Thermal Resistance SOT26
Package Thermal Resistance WDFN-8L 3×3
Package Thermal Resistance WDFN-8L 2×2
Package Thermal Resistance WDFN-6L 1.6×1.6
Operating Temperature Range
Storage Temperature Range
Lead temperature (Soldering, 10sec)
ESD Level (Human Body Model)
ESD Level (Machine Model)
-0.3V~6V
-0.3V~ (VIN+0.3) V
400mW
926mW
606mW
571mW
250°C/W
108°C/W
165°C/W
175°C/W
-40
°
C to 85
°
C
-55°C to 125°C
260°C
2KV
200V
Caution:
Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only
rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification
is not implied.
4
Leadtrend Technology Corporation
LD6918-DS-02a, November 2009
www.leadtrend.com.tw
LD6918
Electrical Characteristics
(CE1=CE2=V
IN
, C
IN
=C
OUT1
=C
OUT2
=1μF, V
IN
=4.3V, V
OUT1
=1.5V, V
OUT2
=3.3V,T
A
=-40°C to +85
o
C unless otherwise stated,
Typical value are at T
A
=25°C) (NOTE 1)
PARAMETER
INPUT POWER
Input Voltage
Quiescent Current
Shutdown Supply Current
Dropt Voltage
I
OUT
=200mA, V
OUT
≥3.0V
I
OUT
=300mA, V
OUT
≥3.0V
Dropt Voltage (Note2)
I
OUT
=200mA, 2.5V≤ V
OUT
<3.0V
I
OUT
=300mA, 2.5V≤V
OUT
<3.0V
I
OUT
=200mA, 2.0V≤ V
OUT
<2.5V
I
OUT
=300mA, 2.0V≤V
OUT
<2.5V
OUTPUT
Output Current Limit
I
OUT
=
1mA, T
A
=+25
°
C;
Output Voltage Accuracy
I
OUT
=
1mA, T
A
=-40
°
C to +85
°
C
I
OUT
=1mA to 300mA,
T
A
= -40
°
C to +85
°
C
Line Regulation
Load Regulation
Output Noise Voltage
V
IN
=V
OUT
+1V to 5.5V, I
OUT
=1mA,
1mA≤ I
OUT
≤
300mA
BW=100Hz to 100KHz,I
OUT
=1mA
F=1KHz, E
IN
=1Vrms,
I
OUT
=10mA, C
OUT
=2.2μF
F=10KHz, E
IN
=1Vrms,
Ripple Rejection
I
OUT
=10mA, C
OUT
=2.2μF
F=100KHz, E
IN
=1Vrms,
I
OUT
=10mA, C
OUT
=2.2μF
F=1MHz, E
IN
=1Vrms,
I
OUT
=10mA, C
OUT
=2.2μF
Discharge Resistance
In shutdown
CE1=High to Low
CE2=High to Low
-
-
-
-
-
-
0.001
60
70
60
50
35
120
120
-
-
250
250
dB
dB
Ω
-
330
-1
-2
-3
420
+1
+2
+3
0.02
0.003
mA
%
%
%
%/V
%/mA
μVrms
dB
170
240
190
270
255
350
220
320
250
360
330
460
mV
mV
mV
mV
mV
mV
CE1=CE2=V
IN
, I
OUT1
= I
OUT2
=
0mA
CE1=CE2=GND
-
2.5
-
90
0.1
5.5
130
1
V
μA
μA
CONDITIONS
MIN
TYP
MAX
UNITS
5
Leadtrend Technology Corporation
LD6918-DS-02a, November 2009
www.leadtrend.com.tw
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