LD6915
11/20/2009
300mA, Low Noise, Ultra-Fast CMOS LDO Regulator with
Soft Start Function
REV: 00a
General Description
The LD6915 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 LD6915 can be
stable with an output capacitor of 1μF which reduces the
board space and cost.
The LD6915 is available in a space saving SOT-25,
SC70-5 and SC82-4 package.
+Patented
Features
Shutdown current <1μA
Ultra-Fast Response in Load Transient
High PSRR 65dB@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
Applications
Battery-Powered Equipment
Hand-Held Instruments
Typical Application
V
IN
1
μF
/X 5R
C
IN
VIN
OUT
V
OUT
CE
LD6915
C
OUT
1
μF
/X 5R
22 nF
(Op tio n)
SS
G ND
Fig.1 Typical Application Circuit
1
Leadtrend Technology Corporation
LD6915-DS-00a, November 2008
www.leadtrend.com.tw
LD6915
Pin Configuration
SC70-5 (TOP VIEW)
OUT
SS
SC82-4 (TOP VIEW)
VIN
OUT
SOT-25 (TOP VIEW)
OUT
SS
5
1
VIN
P:
Y:
W:
X:
4
4
1
3
5
1
PYWX
2
3
PYWX
2
YWJ 15
XX
2
4
3
GND CE
CE
GND
VIN
Y
W
J15
XX
GND
CE
LD 6915
Year code (E: 2005, F: 2006…..)
Week code
Output Voltage (*note 1)
: Year code (E: 2005, F: 2006…..)
: Week code
: LD6915
: Output Voltage (*note 2)
*Note 1 : Voltage Code for SC70-5/ SC82-4
Code
(V)
1
1.5
2
1.6
3
1.7
4
1.8
5
1.9
6
2.0
7
2.1
8
2.2
9
2.3
a
2.4
b
2.5
c
2.6
d
2.7
e
2.8
f
2.9
g
3.0
h
3.1
i
3.2
j
3.3
*Note 2 : Voltage Code for SOT-25
Code
(V)
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
32
3.2
33
3.3
Ordering Information
Part number
LD6915 GU-XX
LD6915 GF-XX
LD6915 GL-XX
Package
SC70-5
SC82-4
SOT-25
TOP MARK
PYWX
PYWX
YWJ/15XX
Shipping
3000 /tape & reel
3000 /tape & reel
3000 /tape & reel
Note 1: The LD6915 is Green Packaged.
Note 2: Part number XX: Output voltage, ex: 15:1.5V,
…. 33:3.3V (step 0.1V)
2
Leadtrend Technology Corporation
LD6915-DS-00a, November 2008
www.leadtrend.com.tw
LD6915
Pin Descriptions
SOT-25
PIN
1
2
3
4
5
SC70-5
PIN
1
2
3
4
5
SC82-4
PIN
1
2
3
4
NAME
FUNCTION
Chip Enable, High=Enable, Low=Disable
IC GND
Regulator output
Input Voltage
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. For soft start operation
Css>1nF is recommended. Open this pin to disable soft start function.
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. For soft start operation
Css>1nF is recommended. Open this pin to disable soft start function.
Regulator output
FUNCTION
CE
GND
OUT
VIN
3
Leadtrend Technology Corporation
LD6915-DS-00a, November 2008
www.leadtrend.com.tw
LD6915
Block Diagram
VIN
1.25V
CE
Chip Enable
200KΩ
Current limit
& Thermal
Shutdown
R1
OUT
SS
Soft Start
R2
Absolute Maximum Ratings
VIN, VOUT Pin
SS, CE Pin
Power dissipation SOT-25@Ta=25
°
C
Power dissipation SC70-5, SC82-4@Ta=25
°
C
Operating Temperature Range
Package Thermal Resistance SOT-25
Package Thermal Resistance SC70-5, SC82-4
Junction 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
400mW
300mW
-40
°
C to 85
°
C
250°C/W
333°C/W
150
°
C
-55°C to 125°C
260°C
2kV
200V
4
Leadtrend Technology Corporation
LD6915-DS-00a, November 2008
www.leadtrend.com.tw
LD6915
Electrical Characteristics
(V
IN
=V
OUT
+1V, T
A
= 25
o
C, unless otherwise stated. C
IN
=C
OUT
=1μF, C
SS
=22nF; the LD6915 is tested with 3.3V output,
unless other stated.) (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
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
-
170
240
190
270
255
350
7.5
220
250
330
mV
mV
mV
mV
mV
mV
μA
CE>1.5V, I
OUT
=0mA
CE=GND
2.8
-
-
-
270
0.1
5.5
330
1
V
μA
μA
CONDITIONS
MIN
TYP
MAX
UNITS
Dropt Voltage (Note2)
Soft Start
Soft Start Current
OUTPUT
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=1kHz, EIN=1Vrms,
Ripple Rejection
I
OUT
=10mA
F=10kHz, EIN=1Vrms,
I
OUT
=10mA
Output Noise Voltage
Discharge Resistance in shutdown
V
OUT
=3.3V,100Hz~100kHz
I
OUT
=0mA, Css=22nF
CE=High to Low
-
-
100
120
-
250
μVrms
Ω
-
55
-
dB
330
-2
-
-
65
0.05
420
-
+2
0.2
0.6
-
mA
%
%/V
%
dB
-
5
Leadtrend Technology Corporation
LD6915-DS-00a, November 2008
www.leadtrend.com.tw
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