MIC5254
Dual 150mA µCap LDO
with Error Flag Outputs
General Description
The MIC5254 is an efficient, precise, dual CMOS voltage
regulator. It offers better than 1% initial accuracy,
extremely low dropout voltage (typically 135mV at 150mA)
and low ground current (typically 90µA) over load. The
MIC5254 features two independent LDOs with error flags
that indicate an output fault condition such as overcurrent,
thermal shut-down and dropout.
Designed specifically for handheld and battery-powered
devices, the MIC5254 provides a TTL-logic-compatible
enable pin. When disabled, power consumption drops
nearly to zero.
The MIC5254 also works with low-ESR ceramic
capacitors, reducing the amount of board space necessary
for power applications, critical in handheld wireless
devices.
Key features include current limit, thermal shutdown, faster
transient response, and an active clamp to speed up
device turnoff. The MIC5254 is available in the 10-pin
MSOP package and is rated over a –40°C to +125°C
junction temperature range.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
Input voltage range: 2.7V to 6.0V
Dual, independent 150mA LDOs
Error flags indicate fault condition
Stable with ceramic output capacitor
Ultra-low dropout: 135mV @ 150mA
High output accuracy: 1.0% initial accuracy 2.0% over
temperature
Low quiescent current: 90µA each LDO
Tight load and line regulation
Thermal shutdown and current limit protection
“Zero” off-mode current
TTL logic-controlled enable input
10-pin MSOP package
Applications
•
•
•
•
•
Cellular phones and pagers
Cellular accessories
Battery-powered equipment
Laptop, notebook, and palmtop computers
Consumer/personal electronics
___________________________________________________________________________________________________________
Typical Application
V
INA
1µF
MIC5254
9
VINA OUTA
ENA
FLGA
10
V
OUTA
2
1
FLGA
1µF
Ceramic
V
OUTB
3
GNDA OUTB
VINA FLGB
ENB
GNDB
8
V
INB
1µF
6
5
4
7
FLGB
1µF
Ceramic
Dual Output LDO with Error Flag
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
December 2007
M9999-121107
Micrel, Inc.
MIC5254
Ordering Information
Part Number
MIC5254-SJBMM
MIC5254-SJYMM
Note:
Other voltages available. Contact Micrel Marketing for details.
VOUTA
3.3V
3.3V
VOUTB
2.5V
2.5V
Temperature Range
–40° to +125°C
–40° to +125°C
Package
10-Pin MSOP
10-Pin MSOP
Lead Finish
Standard
Pb-Free
Pin Configuration
10-Pin MSOP (MM)
Pin Description
Pin Number
1
2
3
9
10
4
5
7
6
8
Pin Name
FLGA
ENA
GNDA
INA
OUTA
FLGB
ENB
GNDB
INB
OUTB
Channel
A
A
A
A
A
B
B
B
B
B
Pin Name
Error Flag (Output): Open-drain output. Active low indicates an output
undervoltage condition.
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
Ground
Supply Input
Regulator Output
Error Flag (Output): Open-drain output. Active low indicates an output
undervoltage condition.
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
Ground
Supply Input
Regulator Output
December 2007
2
M9999-121107
Micrel, Inc.
MIC5254
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
).................................... 0V to +7V
Enable Input Voltage (V
EN
)................................... 0V to +7V
Power Dissipation (P
D
) ................... Internal Limited,
Note 3
Junction Temperature (T
J
) ........................–40°C to +125°C
Lead Temperature (soldering, 5 sec.)........................ 260°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply Input Voltage (V
IN
)............................... +2.7V to +6V
Enable Input Voltage (V
EN
)..................................... 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Thermal Resistance
MSOP-10 (θ
JA
) .................................................200°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1V; V
EN
= V
IN
; I
OUT
= 100µ; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Symbol
V
O
∆V
LNR
∆V
LDR
V
IN
– V
OUT
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Dropout Voltage,
Note 7
Condition
I
OUT
= 100µA
V
IN
= V
OUT
+ 1V to 6V
I
OUT
= 0.1mA to 150mA,
Note 6
I
OUT
= 100µA
I
OUT
= 100mA
I
OUT
= 150mA
I
Q
I
GND
PSRR
Quiescent Current
Ground Pin Current,
Note 8
Power Supply Rejection
V
EN
≤
0.4V (shutdown)
I
OUT
= 0mA
I
OUT
= 150mA
f = 10Hz, V
IN
= V
OUT
+ 1V; C
OUT
= 1µF
f = 100Hz, V
IN
= V
OUT
+ 0.5V; C
OUT
= 1µF
f = 10kHz, V
IN
= V
OUT
+ 0.5V
I
LIM
e
n
V
IL
V
IH
I
EN
Current Limit
Output Voltage Noise
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
Shutdown Resistance Discharge
Error Flag
V
FLG
V
OL
I
FL
Low Threshold
High Threshold
Output Logic-Low Voltage
Flag Leakage Current
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
% of V
OUT
(Flag ON)
% of V
OUT
(Flag OFF)
I
L
= 100µA, fault condition
Flag OFF, V
FLG
= 6V
90
96
0.02
0.01
150
10
0.1
%
%
V
µA
°C
°C
V
IN
= 2.7V to 5.5V, regulator shutdown
V
IN
= 2.7V to 5.5V, regulator enabled
V
IL
≤
0.4V, regulator shutdown
V
IH
≥
1.6V, regulator enabled
1.6
0.01
0.01
500
V
OUT
= 0V
160
Min
–1
–2
0.02
1.5
0.1
90
135
0.2
90
117
60
60
45
425
30
0.4
150
200
250
1
150
Typ
Max
+1
+2
0.075
2.5
Units
%
%
%/V
%
mV
mV
mV
mV
µA
µA
µA
dB
dB
dB
mA
µV
RMS
V
V
µA
µA
Ω
Enable Input
Thermal Protection
December 2007
3
M9999-121107
Micrel, Inc.
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
MIC5254
3. The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The
θ
JA
of the MIC5254-SJBMM is 200°C/W on a
PC board (see “Thermal Considerations” section for further details).
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
6. 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.
7. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1Vdifferential.
For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum input operating
voltage is 2.7V.
8. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin
current.
Test Circuit
V
INA
1µF
MIC5254
9
VINA OUTA
ENA
FLGA
10
V
OUTA
2
1
FLGA
0.01µF
1µF
Ceramic
V
OUTB
3
GNDA OUTB
VINA FLGB
ENB
GNDB
8
V
INB
1µF
6
5
4
7
FLGB
0.01µF
1µF
Ceramic
December 2007
4
M9999-121107
Micrel, Inc.
MIC5254
Typical Characteristics
For each LDO Channel
70
60
50
PSRR (dB)
40
30
20
100µA*
50mA*
100mA*
150mA*
Power Supply Rejection Ratio
*I
LOAD
10
C
OUT
= 1.0µF Ceramic
0
10
100 1k
10k 100k
FREQUENCY (Hz)
1M
130
GROUND CURRENT (µA)
125
120
115
110
105
100
0.1
Ground Pin Current
V
IN
= V
OUT
+ 1V
1
10
100
1000
OUTPUT CURRENT (mA)
140
GROUND CURRENT (µA)
120
100
80
60
40
20
Ground Pin Current
OUTPUT VOLTAGE (V)
3.5
3
2.5
2
1.5
1
0.5
0
0
Dropout
Characteristics
100µA
150mA
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT VOLTAGE (V)
I
LOAD
= 150mA
1
2
3
4
5
INPUT VOLTAGE (V)
6
180
DROPOUT VOLTAGE (mV)
160
140
120
100
80
60
40
20
Dropout Voltage
DROPOUT VOLTAGE (mV)
180
160
140
120
100
80
60
40
20
Dropout Voltage
T = –40°C
T = 25°C
T = 125°C
I
LOAD
= 150mA
0
-40 -20 0 20 40 60 80 100120140
0
0 20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
December 2007
5
M9999-121107
PCB设计
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