LD6922
5/7/2011
500mA, Ultra-Low Noise, High PSRR CMOS LDO Regulator
with Soft Start Function
REV: 02
General Description
The LD6922 is a micro power linear regulator with
minimum output voltage drop during load transient,
featuring ultra-low noise, low-dropout and high ripple
rejection ratio for optimal performance of battery-powered
systems. This SS pin can suppress the noise and is built in
with soft start function. As well, the LD6922 is stable with
an output capacitor of 1F which reduces the board space
and cost.
The LD6922 is available in a space saving SC82-4,
SOT23-5, SC70-5, SC70-6, and WDFN-6L 1.6mm x
1.6mm package.
+Patented
Features
Wide Operating Input Voltage Range：2.5V to 5.5V
Minimum Output Voltage Drop during Load Transient
Ultra-Low Noise for RF Application
Shutdown Current <1A
High PSRR 70dB@1kHz
Stable with 1F Output Capacitor
Thermal Shutdown and Current Limiting Protection
V
OUT
Discharge Function
Soft Start Operation
Fixed Output Voltage: 1.2V to 3.3V (step：0.1V), and
3.45V.
Applications
Battery-Powered Equipment
Hand-Held Instruments
Palmtops, Notebook Computers
Typical Application
V
IN
1μF
1μF
Enable
CE
VIN
OUT
*
V
OUT
LD6922
SS
22nF/X7R
(option)
GND
Fig. 1 Typical Application Circuit for General Purpose
1
Leadtrend Technology Corporation
LD6922-DS-02
May 2012
www.leadtrend.com.tw
LD6922
Pin Configuration
SC70-6
OUT
NC
SS
SC70-5
OUT
SS
SC82-4
VIN
OUT
SOT-25
OUT
SS
WD F N L 1.6m mx 1.6mm)
-6
(
SS
6
1
5
4
3
5
4
4
1
3
5
22
Y W
J
XX
1
2
4
3
6
5
VYWX
2
1
VYWX
2
3
VYWX
VXX
YWT
2
GND
VIN GND CE
V
Y
W
X
:
:
:
:
VIN GND CE
CE
GND
LD6922
Year code (D: 2004, E: 2005…..)
Week code
voltage code (note 1)
V I N G N D CE
Y : Ye a r c o d e
W : Week code
J22: LD6922
XX : v o l t a g e d(n o t e 2
co e
V : LD6922
XX: v o l t a g e (noodt e 2 )
c
e
XX : 345: 3.45V
)T:
Thickness
W: 0.75mm (normal)
*Note 1 : Voltage Code for SC70-6, SC70-5, SC82-4
Code
(V)
E
1.2
F
1.3
G
1.4
H
1.5
I
1.6
J
1.7
K
1.8
L
1.9
M
2.0
N
2.1
O
2.2
P
2.3
Q
2.4
R
2.5
S
2.6
T
2.7
U
2.8
VIN
1
2
CE
OUT
4
3
NC
V
2.9
W
3.0
X
3.1
Code
(V)
Y
3.2
Z
3.3
5
3.45
*Note 2 : Voltage Code for SOT-25, WDFN-6L
Code
(V)
12
1.2
13
1.3
14
1.4
15
1.5
16
1.6
17
1.7
18
1.8
19
1.9
20
2.0
21
2.1
22
2.2
23
2.3
24
2.4
25
2.5
26
2.6
27
2.7
28
2.8
29
2.9
30
3.0
31
3.1
Code
(V)
32
3.2
33
3.3
345
3.45
Ordering Information
Part number
LD6922 GF-XX
LD6922 GL-XX
LD6922 GC- XX
LD6922 GU- XX
LD6922 GDAW- XX
Package
SC82-4
SOT25
SC70-5
SC70-6
WDFN-6L 1.6mm×1.6mm
TOP MARK
VYWX
YWJ/22XX
VYWX
VYWX
VXX
Shipping
3000 /tape & reel
3000 /tape & reel
3000 /tape & reel
3000 /tape & reel
2500 /tape & reel
Note 1: The LD6922 is Green Packaged.
Note 2: Part number XX : Output voltage, ex: 12:1.2V…. 33:3.3V (step 0.1V) and 3.45V
2
Leadtrend Technology Corporation
LD6922-DS-02
May 2012
www.leadtrend.com.tw
LD6922
Pin Descriptions
SC82-4
PIN
1
2
3
4
NAME
CE
GND
OUT
VIN
FUNCTION
Chip Enable, High=Enable, Low=Disable
IC GND
Regulator output
Input Voltage
SOT23-5, SC70-5
PIN
1
2
3
4
5
SC70-6
PIN
1
2
3
4
5
6
WDFN-6L
PIN
1
2
3
4
5
6
NAME
CE
GND
VIN
OUT
NC
SS
FUNCTION
Chip Enable, High=Enable, Low=Disable
IC GND
Input Voltage
Regulator output
No connection
This pin combines noise reduction and soft start function. Connect a capacitor to
GND to adjust soft start time.
NAME
VIN
GND
CE
SS
NC
OUT
Input Voltage
IC GND
Chip Enable, High=Enable, Low=Disable
This pin combines noise reduction and soft start function. Connect a capacitor to
GND to adjust soft start time.
No connection
Regulator output
FUNCTION
NAME
VIN
GND
CE
SS
OUT
Input Voltage
IC GND
Chip Enable, High=Enable, Low=Disable
This pin combines noise reduction and soft start function. Connect a capacitor to
GND to adjust soft start time.
Regulator output
FUNCTION
3
Leadtrend Technology Corporation
LD6922-DS-02
May 2012
www.leadtrend.com.tw
LD6922
Block Diagram (SC70-6)
VIN
V
REF
Current Limit
&Thermal
Shutdown
R1
OUT
CE
200kΩ
Chip
Enable
R2
SS
Soft Start
NC
GND
Absolute Maximum Ratings
VIN, VOUT Pin
SS, CE Pin
Power dissipation SC82-4@Ta=25
C
Package Thermal Resistance SC82-4
Power dissipation SOT23-5@Ta=25
C
Package Thermal Resistance SOT25
Power dissipation SC70-5@Ta=25
C
Package Thermal Resistance SC70-5
Power dissipation SC70-6@Ta=25
C
Package Thermal Resistance SC70-6
Power dissipation WDFN-6L 1.6×1.6 @TA=25C
Package Thermal Resistance WDFN-6L 1.6×1.6
Maximum Junction Temperature
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
Lead temperature (Soldering, 10sec)
ESD Level (Human Body Model)
ESD Level (Machine Model)
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.
-0.3V~6V
-0.3V~ (VIN+0.3) V
300mW
333C/W
400mW
250C/W
300mW
333C/W
300mW
333C/W
571mW
175C/W
150
C
-40
C to 125
C
-40
C to 85
C
-55C to 125C
260C
2kV
200V
4
Leadtrend Technology Corporation
LD6922-DS-02
May 2012
www.leadtrend.com.tw
LD6922
Electrical Characteristics
(VIN=VOUT+1V, T
A
= 25
C, unless otherwise stated. CIN=COUT=1μF, CSS=22nF; the LD6922 is tested with 3.1V output,
unless other stated.) (Note 1)
PARAMETER
INPUT POWER
Input Voltage
Quiescent Current
Shutdown Supply Current
Dropt Voltage
Dropt Voltage (Note2)
I
OUT
=300mA, 2.5VV
IN
3.6V
I
OUT
=300mA, 3.6VV
IN
5.5V
I
OUT
=500mA, 3.6VV
IN
5.5V
Soft Start
Internal Soft Start Time
Output
Output Current Limit
Line Regulation
R
LOAD
=1
V
IN
=V
OUT
+1V, to 5.5V,
I
OUT
=1mA
1mA<I
OUT
<300mA
Load Regulation
V
IN
=V
OUT
+1V, 2.5VV
OUT
3.3V
1mA<I
OUT
<500mA
V
IN
=V
OUT
+1V, 2.5VV
OUT
3.3V
F=120Hz, E
IN
=1Vrms,
I
OUT
=10mA
Ripple Rejection
F=1kHz, E
IN
=1Vrms,
I
OUT
=10mA
F=10kHz, E
IN
=1Vrms,
I
OUT
=10mA
Output Noise Voltage
V
OUT
=1.8V, I
OUT
=0mA
C
SS
=22nF
-
-
70
550
-
600
0.05
0.2
mA
%/V
60
100
140
S
390
230
380
430
300
500
mV
mV
mV
CE>1.5V, I
OUT
=0mA
CE=GND
2.5
-
-
-
80
0.1
5.5
105
1
V
A
A
CONDITIONS
MIN
TYP
MAX
UNITS
-
0.8
%
1.6
%
dB
70
-
dB
65
-
dB
Vrms
35
-
5
Leadtrend Technology Corporation
LD6922-DS-02
May 2012
www.leadtrend.com.tw
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