CM2851

CM2851
150mA CMOS LDO WITH EN & PG
GENERAL DESCRIPTION
FEATURES
The CM2851 family is positive, linear regulators featured low
Very Low Dropout Voltage
quiescent current (30µA typ.) with low dropout voltage,
Low Current Consumption: Typ. 30µA, Max. 35µA
making them ideal for battery applications. The space-saving
High Accuracy Output Voltage: +/- 1.5%
SOT-23-5 package is attractive for “Pocket” and “Hard Held”
Guaranteed 150mA Output
applications.
Input Range of 2.5V to 7.0V
Thermal Shutdown
These rugged devices have both Thermal Shutdown, and
Current Limiting
Current Fold-back to prevent device failure under the “Worst”
Power Good Output Function
of operating conditions.
Compact Package: SOT-23-5
Factory Pre-set Output Voltages
An additional feature is a “Power Good” detector, which pulls
Short Circuit Current Fold-Back
low when the output is out of regulation.
Low Temperature Coefficient
The CM2851 is stable with an output capacitance of 2.2µF or
greater.
APPLICATIONS
Battery-powered devices
Personal communication devices
Home electric/electronic appliances
PC peripherals
TYPICAL APPLICATIONS
IN
IN
1M Ω
PG
5V
2004/06/01 Rev. 1.2
C1
1uF
OUT
OUT
C M 2851
GND
EN
C PG
* For programm ing
delay > typ. 5ms
(Optional)
Champion Microelectronic Corporation
C2
4.7uF
Page 1
CM2851
150mA CMOS LDO WITH EN & PG
PIN CONFIGURATION
SOT-23-5
Top View
4
VIN
GND
EN
PG
OUT
5
1
2
3
BLOCK DIAGRAM
IN
O UT
1uA
Overcurrent
Shutdown
R1
Thermal
Shutdown
EN
-
PG
AMP
+
+
R2
Vref = 1.176V
Vref x 85%
Digital PG
1-5ms
2004/06/01 Rev. 1.2
Champion Microelectronic Corporation
G ND
Page 2
CM2851
150mA CMOS LDO WITH EN & PG
ORDERING INFORMATION
Part Number
CM2851ACIM25
CM2851SIM25
CM2851GACIM25
CM2851GSIM25
Output Voltage
1.2V
3.3V
1.2V
3.3V
Temperature Range
-40℃ ~ +85℃
-40℃ ~ +85℃
-40℃ ~ +85℃
-40℃ ~ +85℃
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Note: For other pre-set output voltage, please contact Champion Sales office.
ABSOLUTE MAXIMUM RATINGS
OPERATING RATINGS
Input Voltage
Ambient Temperature Range (TA) ……... -40℃ to +85℃
…………….……………………………. +7V
Output Current
…………………….……
Output Voltage
…………………… GND-0.3V to VIN+0.3V
PD / (VIN - Vo)
Junction Temperature Range
…..…... -40℃ to +125℃
ESD Classification ………………………………………… B
THERMAL INFORMATION
Parameter
Thermal Resistance (Θjc)
Internal Power Dissipation (PD)
(ΔT = 100℃)
Maximum Junction Temperature
Maximum Lead Temperature (10 Sec)
SOT-23-5
SOT-23-5
Maximum
160
250
Unit
℃/W
mW
150
300
℃
℃
*With Junction sink capable of twice times ofΘjc
Caution: Stress above the listed absolute rating may cause permanent damage to the device.
2004/06/01 Rev. 1.2
Champion Microelectronic Corporation
Page 3
CM2851
150mA CMOS LDO WITH EN & PG
ELECTRICAL CHARACTERISTICS
TA = +25℃; unless otherwise noted
Parameter
Symbol
Input Voltage
VIN
Output Voltage Accuracy
VOUT
CM2851
Test Conditions
Min.
Typ.
Note 1
IO = 1mA
IO = 150mA,
-1.5
Unit
Max.
7
V
1.5
%
1.2V< VO(NOM)<=2.0V
1300
2.0V< VO(NOM)<=2.5V
800
Dropout Voltage
VDROPOUT
Output Current
IO
VOUT > 1.2V
Current Limit
ILIM
VOUT > 1.2V
450
Short Circuit Current
ISC
VOUT < 0.8V
150
300
mA
Quiescent Current
IQ
IO = 0mA
30
35
μA
Ground Pin Current
IGND
IO = 1mA to 150mA
VOUT=VO(NOM)-1.5%,
IOUT=1mA, VIN=VOUT+1 to
2.5V< VO(NOM)
mV
300
150
mA
mA
30
35
μA
VOUT < 2.0V
-0.1
0.02
0.1
%
2.0V<VOUT < 3.0V
-.015
0.03
0.15
%
3.0V<VOUT
-0.3
0.06
0.3
%
0.2
1
150
%
℃
Line Regulation
REGLINE
Load Regulation
REGLOAD
Over Temperature Shutdown
OTS
Over Temperature Hysteresis
OTH
30
℃
VOUT Temperature Coefficient
TC
25
ppm/℃
Power Supply Rejection
PSRR
Output Voltage Noise
EN Input Bias Current
EN Input Threshold
VOUT+2
IO=1mA to 150mA
135
IO = 100mA
CO=2.2µF ceramic
f=10Hz to 100kHz
eN
IO = 10mA
f=1kHz
60
f=10kHz
50
f=100kHz
40
CO=2.2µF
30
dB
μVrms
IEH
VEN=VIN, VIN=2.7V to 7V
0.1
μA
IEL
VEN=0V, VIN=2.7V to 7V
1.0
3.0
μA
VEH
VIN=2.7V to 7V
VIN/2+0.8V
VIN
V
3.0
μA
0.1
V
VEL
VIN=2.7V to 7V
Shutdown Supply Current
ISD
VIN=5.0V, VOUT=0V, VEN < VEL
Shutdown Output Voltage
VO, SD
IO=150mA
Output Under Voltage
VUV
0
VIN/2-0.8V
2.0
0
V
2.5V<=VOUT <= 5.0V
85
1.2V<=VOUT <= 2.5V
85
%V O(NOM)
PG Leakage Current
ILC
VPG = 7V
1
μA
PG Voltage Rating
VPG
VOUT in regulation
7
V
PG Voltage Low
VOL
ISINK = 2mA
0.1
V
Delay Time to PG
tDELAY
VIN=2.5V to 6.0V (Note 2)
7
ms
1
Note 1. VIN(MIN) = VOUT + VDROPOUT
Note 2: Delay time will be varied by input voltage, but the delay time will still be in the
spec from 1ms to 7ms when VIN rise time <2ms.
2004/06/01 Rev. 1.2
Champion Microelectronic Corporation
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CM2851
150mA CMOS LDO WITH EN & PG
DETAILED DESCRIPTION
The CM2851 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current
protection, output short circuit protection, thermal shutdown, and power good function.
The P-channel pass transistor receives data from the error amplifier, over-current shutdown, short output protection, and thermal
protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current
and Thermal shutdown circuits become active when the junction temperature exceeds 150℃, or the current exceeds 150mA.
During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops
below 120℃.
The CM2851 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents
over-stress. The CM2851 also incorporates current fold-back to reduce power dissipation when the output is short-circuited. This
feature becomes active when the output drops below 0.95V, and reduces the current flow by 65%. Full current is restored when
the voltage exceeds 0.95V.
EXTERNAL CAPACITOR
The CM2851 is stable with an output capacitor to ground of 2.2µF or greater. It can keep stable even with higher or poor ESR
capacitors. A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should be
larger than 0.1µF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A “quiet” ground
termination is desirable.
ENABLE
The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shut off, and all internal circuits are
powered down. In this state, the quiescent current is less than 1µA. This pin behaves much like an electronic switch.
POWER GOOD
The CM2851 includes the Power Good feature. Under normal operating condition which means output voltage is within the SPEC,
PG should be high. If Vout is less than 85% VOUT SPEC, PG will go low. As VOUT comes back and reaches to the 95%
VOUT SPEC, the PG will go high after 1ms~7ms again. (See Timing Diagram as below)
VIN = VEN= 3.3V, Iload = 120mA, VOUT = 1.2V, Delay time = 4.5ms
2004/06/01 Rev. 1.2
Champion Microelectronic Corporation
Page 5
CM2851
150mA CMOS LDO WITH EN & PG
TYPICAL ELECTRICAL CHARACTERISTICS
2004/06/01 Rev. 1.2
Champion Microelectronic Corporation
Page 6
CM2851
150mA CMOS LDO WITH EN & PG
2004/06/01 Rev. 1.2
Champion Microelectronic Corporation
Page 7
CM2851
150mA CMOS LDO WITH EN & PG
PACKAGE DIMENSION
SOT-23-5 (M25)
D
5
4
b1
With Plating
c
c1
A
A1
E
E1
A2
b
b
Base Metal
b1
c
Section B-B
c1
D
E
1
2
3
e
E1
b
L
e1
L1
e
θ1
e1
θ
θ1
θ
A2
A
θ2
θ2
A1
L
2004/06/01 Rev. 1.2
See Section B-B
L1
Champion Microelectronic Corporation
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CM2851
150mA CMOS LDO WITH EN & PG
NUMBERING SCHEME
Ordering Number: CM2851XYZ (note1)
Ordering Number: CM2851GXYZ (note2)
note1:
CM2851: 150mA CMOS LDO
X : Suffix for voltage output (note 3)
Y : Suffix for Temperature Range (note 4)
Z : Suffix for Package Type (note 5)
note2:
CM2851: 150mA CMOS LDO
G : Suffix for Pb Free Product
X : Suffix for voltage output (note 3)
Y : Suffix for Temperature Range (note 4)
Z : Suffix for Package Type (note 5)
note3: see CMOS LDO Voltage Suffix Table
CM2851 will provide options of AC(1.2V), S(3.3V)
note 4:
Y= I : -40℃~+85℃
(only I grade support for all CMOS LDOs)
note 5:
Z is single alphabet with or without digits
M25 : SOT-23-5 (TR only)
CMOS LDO Voltage Suffix Table
Output Voltage
1.2V
1.3V
1.4V
1.5V
1.6V
1.7V
1.8V
1.9V
2.0V
2.1V
2.2V
2.3V
2.4V
2.5V
2.6V
2004/06/01 Rev. 1.2
Suffix
AC
AB
AA
A
B
C
D
E
F
G
H
I
J
K
L
Output Voltage
2.7V
2.8V
2.9V
3.0V
3.1V
3.2V
3.3V
3.4V
3.5V
3.6V
3.7V
3.8V
3.9V
4.0V
Champion Microelectronic Corporation
Suffix
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
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CM2851
150mA CMOS LDO WITH EN & PG
IMPORTANT NOTICE
Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated
circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify,
before placing orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or
environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for
use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is
understood to be fully at the risk of the customer. In order to minimize risks associated with the customer’s applications, the
customer should provide adequate design and operating safeguards.
HsinChu Headquarter
Sales & Marketing
5F, No. 11, Park Avenue II,
Science-Based Industrial Park,
HsinChu City, Taiwan
T E L : +886-3-567 9979
F A X : +886-3-567 9909
11F, No. 306-3, SEC. 1, Ta Tung Road,
Hsichih, Taipei Hsien 221, Taiwan
2004/06/01 Rev. 1.2
T E L : +886-2-8692 1591
F A X : +886-2-8692 1596
Champion Microelectronic Corporation
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