GM6155 [GAMMA]
150mA LOW-NOISE LDO REGULATOR; 150毫安低噪声LDO稳压器
| 型号： | GM6155 |
| 厂家： | 
GAMMA MICROELECTRONICS INC. |
| 描述： | 150mA LOW-NOISE LDO REGULATOR |
| 文件： | 总9页 (文件大小：245K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
Description
GM6155 is an efficient linear voltage regulator with ultralow
- noise output, very low dropout voltage (typically 17mV at
light loads and 165mV at 50mA), and very low ground cur-
rent (600µA at 100mA output). GM6155 provides better
than 1% initial accuracy.
Ultra low noise output
High output voltage accuracy
Extremely accurate output voltage
Guaranteed 150mA output
Low quiescent current
Designed especially for hand-held, battery-powered de-
vices, GM6155 includes a CMOS or TTL compatible en-
able/ shutdown control input. When shutdown, power con-
sumption drops nearly to zero. Regulator ground current in-
creases only slightly in dropout, further prolonging battery
life. Key features of GM6155 include a reference bypass
pin to improve its excellent low-noise performance, re-
versed-battery protection, current limiting, and over-
temperature shutdown.
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Reverse-battery protection
"Zero" off-mode current
Logic-controlled electronic enable
The GM6155 is available in SOT-25 package.
Application
Cellular telephones
Consumer/ personal electronics
Laptop, notebook, and palmtop computers
Battery-powered equipment
SMPS post-regulator/ dc-to-dc modules
High-efficiency linear power supplies
PCMCIA V and V regulation/ switching
CC PP
TYPICAL APPLICATION CIRCUITS
V
5
V
1
2
3
IN
OUT
Enable
Shutdown
C
= 2.2µF
OUT
4
(tantalum)
EN
Low-Noise Operation:
= 470pF, C
C
BYP
C
2.2µF
BYP
OUT
EN (pin 3) may be connected
directly to IN (pin1).
Basic Operation:
= not used, C
C
1µF
BYP
OUT
www.gammamicro.com
1
MARKING INFORMATION & PIN CONFIGURATIONS (TOP VIEW)
SOT-25 (SOT-23-5)
SOT-25 (SOT-23-5)
OUT
BYP
OUT
ADJ
Part
Identification
5
4
5
4
XXVYW
XXVYW
3
3
1
2
1
2
EN
EN
IN GND
IN GND
Fixed Voltages
Adjustable Voltage
XX = Marking Code(DA = GM6155)
V
= Voltage Code
= Year
Y
W
= Weekly
ORDERING INFORMATION
Ordering Number
Output Voltage Voltage Code
Package
Shipping
SOT-25
SOT-25
SOT-25
SOT-25
SOT-25
SOT-25
SOT-25
SOT-25
SOT-25
SOT-25
SOT-25
GM6155-AST25R
GM6155-2.5ST25R
GM6155-2.7ST25R
GM6155-2.8ST25R
GM6155-2.9ST25R
GM6155-3.0ST25R
GM6155-3.3ST25R
GM6155-3.6ST25R
GM6155-4.0ST25R
GM6155-4.2ST25R
GM6155-5.0ST25R
Adj
A
G
T
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
3,000 Units/ Tape & Reel
2.5V
2.7V
2.8V
2.9V
3.0V
3.3V
3.6V
4.0V
4.2V
5.0V
H
X
J
K
L
M
Y
Q
* For detail Ordering Number identification, please see last page.
PIN DESCRIPTION
Pin Number
Pin Name
Function
Supply Input
Ground
1
2
IN
GND
Enable/ Shutdown(Input): COMS compatible input. Logic high = enable,
logic low or open = shutdown.
3
EN
Reference Bypass: Connect external 470pF capacitor to GND to reduce
output noise. May be left open.
4
BYP
Regulator Output
5
OUT
2
BLOCK DIAGRAM
V
OUT
OUT
IN
V
IN
+
C
OUT
BYP
C
BYP
+
(Optional)
Bandgap
Ref.
OUT
IN
-
V
V
IN
OUT
+
C
EN
OUT
R1
ADJ
Current Limit
Thermal Shutdown
+
C
BYP
R2
(Optional)
Bandgap
-
Ref.
GND
EN
V
= V
(1 + R2/ R1)
OUT
REF
Figure 1. Ultra-Low-Noise Fixed Regulator
Current Limit
Thermal Shutdown
GND
Figure 2. Ultra-Low-Noise Adjustable Regulator
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
-20 ~ + 20
-20 ~ +20
UNITS
Supply Input Voltage
V
IN
V
Enable Input Voltage
V
V
EN
Power Dissipation (Note 3)
Junction Temperature
Lead Temperature (soldering, 5 seconds)
Storage Temperature
P
D
Internally Limited
-40 ~ +125
260
W
°C
°C
°C
T
J
T
LEAD
T
S
-60 ~ +150
OPERATING RATINGS
PARAMETER
Supply Input Voltage
Enable Input Voltage
Junction Temperature
Thermal Resistance
SYMBOL
RATINGS
UNITS
V
IN
+2.5 to +16
V
V
V
EN
0 to V
IN
T
J
-40 ~ + 125
(Note 3)
°C
q
°C/ W
JA
3
ELECTRICAL CHARACTERISTICS
(V = V
IN
+ 1V; I = 100µA; C = 1.0µF; V
L L
2.0; T = 25°C, bold values indicate -40°C
J
T
J
+125°C;
OUT
EN
unless otherwise noted)
Symbol
Typ
Parameter
Test Condition
Min
Max
Unit
-1
1
V
O
Variation from specified V
OUT
Output Voltage Accuracy
%
-2
2
Output Voltage Temperature
Coefficient
DV / DT
O
(Note 4)
ppm/ °C
40
0.004 0.012/
DV / V
O
V
IN
= V
+ 1V to 16V
Line Regulation
%/ V
O
OUT
0.05
DV / V
O
I = 0.1mA to 150mA, (Note 5)
L
Load Regulation
0.02 0.2/ 0.5
%
O
I
I
I
I
= 100µA
10
110
140
50
70
L
L
L
L
= 50mA
150
230
250
300
275
350
1
V
IN
- V
Dropout Voltage (Note 6)
mV
O
= 100mA
= 150mA
165
V
0.4V (shutdown)
0.01
EN
I
GND
µA
Quiescent Current
V
0.18V (shutdown)
5
EN
V
2.0V, I = 0.1mA
L
80
350
600
1300
125
EN
150
I
= 50mA
= 100mA
= 150mA
600
L
800
I
Ground Pin Current (Note 7)
µA
GND
I
1000
1500
1900
2500
L
I
L
f = 100Hz, I = 0.1mA
L
Ripple Rejection
Current Limit
PSRR
75
dB
I
V
= 0V
320
0.05
500
mA
LIMT
OUT
(Note 8)
= 50mA, C = 2.2µF,
DV / DP
O
Thermal Regulation
%/ W
D
I
L
L
e
Output Noise
260
nV/ Hz
NO
470pF from BYP to GND
ENABLE Input
Enable Input Logic-Low
Voltage
0.4
V
Regulator shutdown
V
IL
0.18
Enable Input Logic-High
Voltage
V
Regulator enabled
2.0
V
IH
V
0.4V
IL
0.01
-1
I
µA
IL
-2
V
0.18V
IL
Enable Input Current
5
20
I
IH
V
IH
2.0V
µA
2
25
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3: The maximum allowable power dissipation at any T (ambient temperature) is P (max) = (T (max) -T )
J
q . Exceeding the maximum
JA
A
D
A
allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
Note 4: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 5: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the
load range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 6: Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at
1V differential.
Note 7: Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the
sum of the load current plus the ground pin current.
Note 8: Thermal regulation is defined as the change in output voltage at a time "t" after a change in power dissipation is applied, excluding load
or line regulation effects. Specifications are for a 150mA load pulse at V = 16V for t = 10ms.
IN
4
Applications Information
Enable/ Shutdown
Forcing EN (enable/ shutdown) high (>2V) enables the regulator. EN is compatible with CMOS logic gates. If
enable shutdown feature is not required, connect EN (pin 3) to IN (supply input, pin 1). See Figure 3.
Input Capacitor
A 1µF capacitor should be placed from IN to GND if there is more than 10 inches of wire between the input
and the acfilter capacitor or if a battery is used as the input .
Reference Bypass Capacitor
BYP (reference bypass) is connected to the internal voltage reference. A 470pF capacitor (C
) connected
BYP
from BYP to GND quiets this reference, providing a significant reduction in output noise. C
reduces the
BYP
regulator phase margin, when using C
, output capacitors of 2.2µF or greater are generally required to
BYP
maintain stability.
The start-up speed of GM6155 is inversely proportional to the size of the reference bypass capacitor.
Applications requiring a slow ramp-up of output voltage should consider larger values of C . Likewise, if
BYP
rapid turn-on is necessary, consider omitting C
.
BYP
If output noise is not a major concern, omit C
and leave BYP open.
BYP
Output Capacitor
An output capacitor required between OUT and GND to prevent oscillation. The minimum size of the output
capacitor is dependent upon whether a reference bypass capacitor is used. 1.0µF minimum is recommended
when C is not used (see Figure 2). 2.2µF minimum is recommended when C is 470pF (see Figure 1).
BYP
BYP
Larger values improve the regulator's transient response, the output capacitor value may be increased
without limit.
The output capacitor should have an ESR (effective series resistance) of about 5W or less and a resonant
frequency above 1MHz. Ultra-low-ESR capacitors can cause a low amplitude oscillation on the output and/
or underdamped transient response. Most tantalum or aluminum electrolytic capacitors are adequate; film
types will work, but more expensive. Since many aluminum electrolytics have electrolytes that freeze at
about -30°C, solid tantalums ate recommended for operation below -25°C.
At lower values for output current, less output capacitance is required for output stability. The capacitor can
be reduced to 0.47µF for current below 10mA or 0.33µF for current below 1mA.
No-Load Stability
GM6155 will remain stable and in regulation with no load (other than the internal voltage divider) unlike
many other voltage regulators. This is especially important in CMOS RAM keep-alive applications.
Thermal Considerations
Gm6155 is designed to provide 150mA of continuous current in a very small package. Maximum power
dissipation can be calculated based on the output current and the voltage drop across the part. To determine
the maximum power dissipation of the package, use the junction-to-ambient thermal resistance of the device
and the following basic equation:
(T
J(max)
- T )
A
P
=
D(max)
R
qJA
T
is the maximum junction temperature of the die, 125°C, and T is the ambient operating temperature.
A
J(max)
R
is layout dependent; Table 1 shows examples of junction-to-ambient thermal resistance for the GM6155.
qJA
5
R
1" Square
JA
q
R
Recommended
JA
q
R
Parameter
JC
q
Minimum Footprint
Copper Clad
SOT-23-5
220°C/ W
170°C/ W
130°C/ W
Table 1. SOT-25 Thermal Resistance
The actual power dissipation of the regulator circuit can be determined by using the equation:
P = (V - V ) I
D IN OUT OUT
+ V I
IN GND
Substituting P
for P and solving for the operating conditions that are critical to the application will give
D
D(max)
the maximum operating conditions for the regulator circuit. For example, when operating Gm6155 at room
temperature with a minimum footprint layout, the maximum input voltage for a set output current can be
determined as follows:
(125°C - 25°C)
P
=
D(max)
220°C/W
P
= 455mW
D(max)
The junction-to-ambient thermal resistance for the minimum footprint is 220°C/ W, from Table 1. The maximum
power dissipation must not be exceeded for proper operation. Using the output voltage of 3.3V and an output
current of 150mA, the maximum input voltage can be determined. From the Electrical Characteristics table, the
maximum ground current for150mA output current is 2500µA or 2.5mA.
455mW = (V - 3.3V) 150mA + V • 2.5mA
IN IN
455mW = V • 150mA - 495mA + V • 2.5mA
IN IN
950mW = V • 152.5mA
IN
V
= 6.23V
IN(max)
Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 6.2V in a
SOT-25 package. For a full discussion of heat sinking and thermal effects on voltage regulators.
Fixed Regulator Applications
Figure 3. Ultra-Low-Noise Fixed Voltage Application
Figure 4. Low-Noise Fixed Voltage Application
V
V
V
V
OUT
OUT
IN
IN
5
1
2
3
5
1
2
3
2.2µF
1.0µF
Enable
Shutdown
4
4
EN
470pF
Figure 3. includes a 470pF capacitor for low-noise Figure 4. is an example of a low-noise configuration
operation and shows EN (pin 3) connected to IN (pin 1) where C
is not required. C = 1µF minimum.
BYP
OUT
for an application where enable/ shutdown is not
required. C = 2.2µF minimum.
OUT
Adjustable Regulator Applications
The GM6155 can be adjusted to a specific output voltage by using two externa resistors (Figure 5). The resistors set the
output voltage based on the following equation:
R2
V
= 1.242V X (
+1)
OUT
R1
6
This equation is correct due to the configuration of the bandgap reference. The bandgap voltage is relative to
the output, as seen in the block diagram. Traditional regulators normally have the reference voltage relative to
ground and have a different V equation.
OUT
Resistor values are not critical because ADJ(adjust) has a high input impedance, but for best results use
resistors of 470kW or less for best results. A capacitor from ADJ to ground provides greatly improved noise
performance.
V
V
IN
OUT
1
2
3
5
2.2µF
R1
4
R2
470pF
Figure 5. Ultra-Low- Noise Adjustable Voltage Application
Figure 5 includes the optional 470pF noise bypass capacitor from ADJ to GND to reduce output noise.
Dual-Supply Operation
When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage
Typical Characteristics
0
0
V
= 6V
V
= 6V
IN
IN
V
= 5V
V
= 5V
OUT
OUT
-20
-20
-40
-40
-60
-60
-80
-80
I
=100mA
OUT
I
=100mA
C
= 2.2µF
OUT
OUT
C
= 1µF
C
= 0.01µF
OUT
BYP
-100
-100
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
FREQUENCY(Hz)
FREQUENCY(Hz)
Figure 6. Power Supply Rejection Ratio
Figure 7. Power Supply Rejection Ratio
320
280
240
200
160
120
80
10
125°C
1
100mA
25°C
0.1
10mA
-40°C
0.01
0.001
0.0001
1mA
V
OUT
=5V
C
=10µF
OUT
electrolytic
=10nF
40
C
BYP
0
0
40
80
120
160
10
100
1k
10k
100k 1M
10M
OUTPUT CURRENT (mA)
FREQUENCY(Hz)
Figure 8. Dropout Voltage vs.
Output Current
Figure 9. Noise Performance
7
SOT-25(SOT-23-5) PACKAGE OUTLINE DIMENSIONS
2.9 ± 0.1
1.9 ± 0.05
0.13
0.95 ± 0.038
0.028
0.7
Pad Layout
0~0.1
1.5 ± 0.05
0.039
1.0
2.8 ± 0.1
0.094
2.4
0.65 ± 0.05
0.8 ± 0.05
0.35 ± 0.03
0.037
0.95
0.037
0.95
0.074
1.9
Inches
(
)
5°
5°
mm
1.10 ± 0.1
Unit:mm
ORDERING NUMBER
GM 6155 A ST25 R
Gamma Micro.
Shipping
R: Tape & Reel
Circuit Type
Package
ST25: SOT-25
Output Voltage
A: Adj, 2.5: 2.5V
2.7: 2.7V, 2.8: 2.8V
2.9: 2.9V, 3.0: 3.0V
3.3: 3.3V, 3.6: 3.6V
4.0: 4.0V, 4.2: 4.2V
8
9
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