SAMHOP Microelectronics Corp.
SM1100
150mA CMOS LDO
GENERAL DESCRIPTION
FEATURES
The
SM1100
is a 150mA Low Dropout and
Micro-Power Voltage Regulator suitable for
battery powered portable equipments.
The
SM1100
built-in with internal low R
DSON
PMOS as the pass device, which does not cause
extra ground current in different load and high
dropout
conditions.
The extremely low of
typical 1uA operation current makes the chip
suitable for battery-powered devices.
Built-in high precision voltage reference, and
Current Limit circuits.
Guaranteed 150mA Output
Very Low Dropout Voltage of 300mV
low quiescent current
- 1uA Typical
Output voltages range from 1.5V to 6.0V
in 0.1V increments
Accuracy within
±2%
Built in Current Limiting
SOT-23 Package
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
Cellular Telephones
Battery-powered Equipment
Hand-held Equipment
DSC, Laptop, Notebook, and Palmtop
Computers
SOT23
V
IN
C
IN
1μF
V
OUT
C
OUT
1μF
PACKAGE PIN OUT
SOT23
GND
V
OUT
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SAMHOP Microelectronics Corp.
SM1100
Package and Pin Configuration
SOT23
TOP VIEW
1
SM1101
1.
Vin
Gnd
VOUT
WWZZ
2.
3.
2
3
ORDER INFORMATION
SM1100-XX
150mA Output current, SOT23 package
XX :
Output voltage: 15: 1.5V, 18:1.8V, 33: 3.3V, 50: 5.0V
Marking Information
wwzz : zz :
Output voltage: 15: 1.5V, 18:1.8V, 33: 3.3V, 50: 5.0V
ww : production week code
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SAMHOP Microelectronics Corp.
SM1100
BLOCK DIAGRAM
E N
S h utd o w n
a n d
L o gic C o ntr ol
+
-
E rror A m p
V R E F
D riv er
C u rr e n t- L i m it
I N
B P
O U T
T h er m al
p r o t e c ti o n
G N D
ABSOLUTE MAXIMUM RATINGS
(Note a)
Input Voltage
Continuous Total Power Dissipation, SOT-23
Operating Junction Temperature Range
Storage Temperature Range
Package Thermal Resistance, SOT-23,
θ
JA
Lead Temperature (Soldering, 5 sec.)
Note a:
Exceeding these ratings could cause damage to the device.
12V
0.15W
-40℃ to 125℃
-55℃ to 150℃
250℃/W
260℃
All voltages are with respect to Ground.
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SAMHOP Microelectronics Corp.
SM1100
RECOMMENDED OPERATING CONDITIONS
Recommended Operating
Parameter
Symbol
Min.
Typ.
Max.
Input Voltage
V
IN
2.0
12.0
Input Capacitor (V
IN
to GND)
1.0
Output Capacitor with ESR of 10Ω max.,
1.0
10
Ambient Temperature Range
T
A
- 40
85
Junction temperature
T
J
- 40
150
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, V
IN
= 5V, C
IN
= 1μF, C
OUT
= 1μF, T
A
= 25
O
C.
Parameter
Output Voltage Accuracy
Output Current
Line Regulation
Load Regulation
Dropout Voltage
Symbol
V
O
I
O
ΔV
OI
ΔV
OL
ΔV
I
O
= 40mA, (Vout+1V)< V
IN
< 10V
I
O
=1mA to 100mA
I
O
=150mA
I
O
= 0mA
I
O
= 100mA
R
LOAD
= 1
Ω
freq = 100Hz, C
OUT
=10μF
300
65
2.0V< V
O
(nom)
<=2.8V
2.8V< V
O
(nom)
I
O
= 40mA
Test Conditions
Units
V
μF
μF
O
C
O
C
SM1101
Min
Typ
Max
-2.0
150
0.2
0.3
2.0
Units
%
mA
%V
0.04 %mA
280
240
1
1
400
mV
350
2.9
2.9
uA
μA
mA
dB
Quiescent Current
GND Pin Current
Current Limit
Power Supply Rejection
Ratio (Note a)
I
Q
I
G
I
CL
PSRR
Note a: These parameters, although guaranteed, are not tested in production.
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SAMHOP Microelectronics Corp.
SM1100
The
SM1100
is 150mA CMOS L D O
designed with a Low R
DSON
PMOS pass
transistor, Bandgap voltage reference, Error
amplifier, Current limit. The P-channel pass
transistor receives control signal from
the Error amplifier, Current limit circuits.
During normal operation, the Error
amplifier compares the output voltage to
an internal trimmed precision Bandgap
reference to regulate and output a preset
voltage.
Detailed Description
the highest ESR and resulting in the
poorest AC response.
In addition to the >1uF capacitor connect to
Vin, recommend to add a >0.1uF capacitor
between Vin to Ground to stabilize Vin.
Current Limit
SM
1100 built-in with Current
Limit
protection circuit, which monitors and
controls the gate of the pass transistor
and limiting the output current to 300mA
(Min.).
The
SM1100
is stable with an output
capacitor to ground of 1uF or greater and >
100m ohm ESR. Ceramic or tantalum
capacitors can be used. The capacitor
with larger value and lower ESR provides
better PSRR and line-transient response.
Ceramic capacitors have the lowest ESR,
and will offer the best AC performance.
Aluminum Electrolytic capacitors present
External Capacitor
Selection
Dropout Voltage
Current flow through regulator’s pass PMOS
transistor cause Input-Output voltage drop, it
determines the lowest usable supply voltage.
The
SM1100
PMOS pass switch low R
DSON
only present 300mV dropout voltage at
100mA Iout, it further extend the battery
useful end-of-life voltage.
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