LD6912
9/8/2006
300mA, Low Noise, Ultra-Fast CMOS LDO Regulator with
Soft Start Function
REV: 00
General Description
The LD6912 is a micropower linear regulator, featuring
low-noise, low-dropout and high ripple rejection ration. The
precision of feedback reference voltage is within
±2%
and
output current is up to 300mA. As well, the LD6912 can be
stable with an output capacitor of 1µF which reduces the
board space and cost.
The LD6912 is available in a space saving SOT23-5 or
SC70-5 package.
+Patented
Features
Shutdown current <1µA
Ultra-Fast Response in Load Transient
High PSRR 70dB@1KHz
Thermal Shutdown and Current Limiting Protection
V
OUT
Discharge Function
Stable with 1µF Output Capacitor
Soft Start Operation
Output Voltage: 1.5V to 3.3V (step 0.1V)
Applications
Battery-Powered Equipment
Hand-Held Instruments
Typical Application
V
IN
1µF/X5R
C
IN
VIN
OUT
V
OUT
CE
LD6912
C
OU T
1µF/X5R
SS
22nF
GND
Fig.1 Typical Application Circuit
1
Leadtrend Technology Corporation
LD6912-DS-00, September 2006
LD6912
Pin Configuration
SOT-23-5 (TOP VIEW)
OUT
SS
SC70-5 (TOP VIEW)
OUT
SS
5
1
4
Y
WP 12
XX
2
3
5
4
HYWX
1
2
3
VIN
GND
CE
H:
Y:
W:
X:
VIN
GND CE
YY, Y : Year code (E: 2005, F: 2006…..)
WW, W: Week code
P:
LD69..
(Product family code)
XX:
Output Voltage
Product code: LD6912
Year code (E: 2005, F: 2006…..)
Week code
Output Voltage (1~9: 1.5V~2.3V, a~j:
2.4V~ 3.3V)
Ordering Information
Part number
LD6912 PL-XX
LD6912 GL-XX
LD6912 PU-XX
LD6912 GU-XX
Package
SOT23-5
SOT23-5
(Green Package)
SC70-5
SC70-5
(Green Package)
TOP MARK
YWP/12XX
YWP/12XX
HYWX
HYWX
Shipping
3000 /tape & reel
3000 /tape & reel
3000 /tape & reel
3000 /tape & reel
Note 1: The LD6912 is ROHS compliant.
Note 2: Part number XX: Output voltage, ex: 15:1.5V,
…. 33:3.3V (step 0.1V)
Pin Descriptions
SOT23-5
PIN
1
2
3
4
5
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. Css>1nF is recommended.
Regulator output
FUNCTION
2
Leadtrend Technology Corporation
LD6912-DS-00, September 2006
LD6912
SC70-5
PIN
1
2
3
4
5
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. Css>1nF is recommended.
Regulator output
FUNCTION
Block Diagram
VIN
1.25V
CE
Chip Enable
200KΩ
Current lim it
& Therm al
Shutdown
R1
O UT
SS
Soft Start
R2
Absolute Maximum Ratings
VIN, VOUT Pin
SS, CE Pin
Power dissipation SOT23-5@Ta=25
°
C
Power dissipation SC70-5@Ta=25
°
C
Operating Temperature Range
Package Thermal Resistance SOT23-5
Package Thermal Resistance SC70-5
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
400mW
300mW
-40
°
C to 85
°
C
250°C/W
333°C/W
-55°C to 125°C
260°C
2KV
200V
3
Leadtrend Technology Corporation
LD6912-DS-00, September 2006
LD6912
Electrical Characteristics
(T
A
= +25 C unless otherwise stated, V
IN
=V
OUT
+1V, C
IN
=C
OUT
=1µF, Css=22nF)
PARAMETER
INPUT POWER
Input Voltage
Quiescent Current
Shutdown Supply Current
Dropt Voltage
I
OUT
=200mA, V
OUT
>2.8V
Dropt Voltage
Soft Start
Soft Start Current
OUTPUT
Output Current Limit
Output Voltage Accuracy
Line Regulation
Load Regulation
R
LOAD
=1Ω
I
OUT
=1mA
V
IN
=Vout+1V, to 5.5V,
I
OUT
=1mA
1mA<I
OUT
<300mA
F=120Hz, EIN=1Vrms,
Ripple Rejection
I
OUT
=10mA
F=10KHz, EIN=1Vrms,
I
OUT
=10mA
Output Noise Voltage
Discharge Current
CE
Impedance to GND
Enable
CE Input Level
THERMAL PROTECTION
Thermal Shutdown
Hysteresis
V
OUT
short to GND
145
30
°C
°C
Disable
1.5
-
200
-
-
-
0.6
KΩ
V
V
V
OUT
=3.1V,100Hz~100KHz
I
OUT
=0mA
CE=High to Low
-
30
-
mA
-
40
-
µVrms
-
60
-
dB
330
-2
-
-
-
70
0.02
420
-
+2
0.2
0.6
-
mA
%
%/V
%
dB
-
7.5
-
µA
I
OUT
=300mA, V
OUT
>2.8V
170
220
200
300
mV
mV
V
IN
>1.2V, I
OUT
=0mA
CE=GND
2.8
-
-
-
140
5.5
200
1
V
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
o
4
Leadtrend Technology Corporation
LD6912-DS-00, September 2006
LD6912
Typical Performance Characteristics
3.
2
80
70
3.1
3.1
Ripple Rejection (dB)
-
40
60
50
40
30
20
10
Output Voltage (V)
3.
0
3.0
2.9
2
.90
-20
0
20
40
60
80
120
0
0.01
0.1
1
10
100
1000
Temperature (°C)
Fig.2 Output Voltage vs. Temperature
Frequency (KHz)
Fig.3 Ripple Rejection vs. Frequency
CH1:1V/Div,
V
IN
=4.1V
CH2:1V/Div,
CH3:2V/Div,
CH4:50mA/Div
Time:10mS/Div
CH1:50mVac/Div,
CH4:100mA/Div
Time: 10µS/Div
Fig.4 Start Up Waveform Css=22nF
Fig.5 Load Transient Response
CH1:100µV/DIv
V
IN
=4.1V,
I
OU
T
=0mA
Time: 10mS/Div
Fig.6 Output Noise
5
Leadtrend Technology Corporation
LD6912-DS-00, September 2006
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