Preliminary Datasheet
1
Feb. 2006 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
150mA EXTREMELY LOW NOISE LDO REGULATOR AP2121
General Description
The AP2121 series are positive voltage regulator ICs
designed by CMOS process. Each of these ICs consists
of a voltage reference, an error amplifier, a resistor net-
work for setting output voltage, a current limit circuit
for current protection and a chip enable circuit (5-pin
products only).
The AP2121 series have features of high ripple rejec-
tion, low dropout voltage, low noise, high output volt-
age accuracy, and low current consumption which
make them ideal for use in various battery-powered
devices.
The AP2121 series have 1.5V, 2.5V and 3.2V versions.
The AP2121 are available in standard SOT-23-3 and
SOT-23-5 packages.
Features
Low Dropout Voltage at I
OUT
=100mA: 150mV
Typical (Except 1.5V Version)
Low Standby Current: 0.1
A Typical (Except
1.5V Version)
Low Quiescent Current: 25
A Typical
High Ripple Rejection: 70dB Typicalf=10kHz
Excellent Line Regulation: 4mV Typical
Excellent Load Regulation: 12mV Typical
High Output Voltage Accuracy:
2%
Excellent Line Transient Response and Load
Transient Response
Low ESR Ceramic Capacitor Available
ESD (Human Body Model): 2kV
Applications
Mobile Phones, Cordless Phones
Wireless Communication Equipment
Portable Games
Cameras, Video Recorders
Sub-board Power Supplies for Telecom Equip-
ment
Battery Powered Equipment
Figure 1. Package Types of AP2121
SOT-23-5
SOT-23-3
Preliminary Datasheet
2
Feb. 2006 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
150mA EXTREMELY LOW NOISE LDO REGULATOR AP2121
Pin Configuration
Figure 2. Pin Configuration of AP2121 (Top View)
K Package
(SOT-23-5)
NC
V
OUT
V
IN
GND
1
2
3
4
5
CE
N Package
(SOT-23-3)
V
IN
GND
1
2
3
V
OUT
Pin Description
Pin Number
Pin Name
Function
SOT-23-3
SOT-23-5
3
1
V
IN
Input voltage
1
2
GND
Ground
3
CE
Active high enable input pin. Logic high=enable, logic low=shutdown
4
NC
No connection
2
5
V
OUT
Regulated output voltage
Preliminary Datasheet
3
Feb. 2006 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
150mA EXTREMELY LOW NOISE LDO REGULATOR AP2121
Functional Block Diagram
Figure 3. Functional Block Diagram of AP2121
VREF
CURRENT LIMIT
V
IN
CE
V
OUT
GND
2(1)
3
SOT-23-5 (SOT-23-3)
1(3)
5(2)
Circuit Type
Package
E1: Lead Free
AP2121 -
TR: Tape and Reel
Ordering Information
1.5: Fixed Output 1.5V
2.5: Fixed Output 2.5V
N: SOT-23-3
3.2: Fixed Output 3.2V
K: SOT-23-5
A: Active High
(Pull-down resistor built-in)
Blank: No Enable Function
Preliminary Datasheet
4
Feb. 2006 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
150mA EXTREMELY LOW NOISE LDO REGULATOR AP2121
Parameter
Symbol
Value
Unit
Input Voltage
V
IN
6.5
V
Output Current
I
OUT
300
mA
Storage Temperature Range
T
STG
-65 to 150
o
C
Lead Temperature (Soldering, 10sec)
T
LEAD
260
o
C
ESD (Human Body Model)
2000
V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated
under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods
may affect device reliability.
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Min
Max
Unit
Input Voltage
V
IN
6
V
Operating Junction Temperature Range
T
J
-40
125
o
C
Recommended Operating Conditions
Package
Temperature
Range
Condition
Part Number
Marking ID
Packing
Type
Tin Lead
Lead Free
Tin Lead
Lead Free
SOT-23-3
-40 to 125
o
C
AP2121N-1.5TRE1
EF1
Tape & Reel
SOT-23-5
Active High (Pull-
down resistor built-in)
AP2121AK-2.5TRE1
E1V
Tape & Reel
Active High (Pull-
down resistor built-in)
AP2121AK-3.2TRE1
E3Z
Tape & Reel
Ordering Information (Continued)
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
5
Feb. 2006 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
150mA EXTREMELY LOW NOISE LDO REGULATOR AP2121
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Output Voltage
V
OUT
V
IN
=2.5V,
1mA
I
OUT
30mA
1.47
1.5
1.53
V
Input Voltage
V
IN
6
V
Output Current
I
OUT
V
IN
-V
OUT
=1V
150
mA
Load Regulation
V
RLOAD
V
IN
=2.5V,
1mA
I
OUT
80mA
12
40
mV
Line Regulation
V
RLINE
2.3V
V
IN
6V,
I
OUT
=30mA
4
16
mV
Dropout Voltage
V
DROP
I
OUT
=100mA
400
600
mV
Quiescent Current
I
Q
V
IN
=2.5V, I
OUT
=0mA
25
50
A
Power Supply
Rejection Ratio
PSRR
Ripple 0.5Vp-p, f=10kHz,
V
IN
=2.5V
70
dB
Output Voltage
Temperature Coefficient
V
OUT
/
T
I
OUT
=30mA,
-40
o
C
T
J
125
o
C
150
V/
o
C
(V
OUT
/V
OUT
)/
T I
OUT
=30mA,
-40
o
C
T
J
125
o
C
100
ppm/
o
C
Short Current Limit
I
LIMIT
V
OUT
=0V
50
mA
RMS Output Noise
V
NOISE
T
A
=25
o
C,
10Hz
f100kHz
30
Vrms
(V
IN
=2.5V, T
J
=25
o
C, C
IN
=1
F,
C
OUT
=1
F, unless otherwise specified.)
Electrical Characteristics
AP2121-1.5V Electrical Characteristics
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