MIC5248
150mA µCap CMOS LDO Regulator
w/Power Good
General Description
The MIC5248 is an efficient, general purpose 1.2V CMOS
voltage regulator with a power good output function. The
MIC5248 offers better than 3%initial accuracy, and
constant ground current (typically 100µA) over load.
The MIC5248 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, a
push-pull output for faster transient response, and an
active clamp to speed up device turnoff. Available in the
IttyBitty™ SOT-23-5 and the tiny 6-pin 2mm x 2mm MLF
®
package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
Power Good indicator
Load independent, ultra-low ground current: 100µA
150mA output current
Current limiting
Thermal shutdown
Tight load and line regulation
“Zero” off-mode current
Stability with low-ESR capacitors
Fast transient response
TTL-logic-controlled enable input
Applications
•
Processor power-up sequencing
•
Laptop, notebook, and palmtop computers
•
PCMCIA VCC and VPP regulation/switching
Typical Application
MIC5248-x.xBM5/YM5/YML
VIN
GND
EN
VOUT
C
OUT
PG
Low-Noise Regulator Application
IttyBitty is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2006
M9999-080106
Micrel, Inc.
MIC5248
Ordering Information
Part Number
MIC5248-1.2BM5
MIC5248-1.2YM5
MIC5248-1.2YML
Marking
LV12
KV12
12V
Voltage*
1.2V
1.2V
1.2V
Junction Temp. Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
5-Pin SOT-23
5-Pin SOT-23
6-Pin 2x2 MLF
®
Lead Finish
Standard
Pb-Free
Pb-Free
*Other Voltage available. Contact Micrel for details.
Pin Configuration
EN 1
GND 2
IN 3
6 PG
5 NC
4 OUT
MIC5248-x.xBM5
MIC5248-x.xYM5
MIC5248-x.xYML
Pin Description
Pin Number
6-Pin MLF
1
2
3
4
5
6
Pin Number
5-Pin SOT-23
3
2
1
5
–
4
EN
GND
IN
OUT
NC
PG
Enable/Shutdown (Input): CMOS compatible input. Logic high
= enable; logic low = shutdown. Do not leave open.
Ground
Supply Input
Regulator Output
No Connect
Power Good Output
Pin Name
Pin Name
August 2006
2
M9999-080106
Micrel, Inc.
MIC5248
Absolute Maximum Ratings
(1)
Supply Input Voltage (V
IN
).................................... 0V to +7V
Enable Input Voltage (V
EN
)..................................... 0V to V
IN
Flag Output Voltage (V
PG
) ...................................... 0V to V
IN
Junction Temperature (T
J
) ....................................... +150°C
Storage Temperature (T
S
).........................–65°C to +150°C
Lead Temperature (soldering, 5sec.)......................... 260°C
EDS Rating
(3)
Operating Ratings
(2)
Input Voltage (V
IN
)........................................... +2.7V to +6V
Enable Input Voltage (V
EN
)..................................... 0V to V
IN
Flag Output Voltage (V
PG
) ...................................... 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Thermal Resistance
SOT-23-5 (θ
JA
).................................................235°C/W
MLF-6 (θ
JA
) ......................................................100°C/W
Electrical Characteristics
V
IN
= 2.7V, V
EN
= V
IN
; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C< T
J
< +125°C, unless noted.
Symbol
V
O
∆V
LNR
∆V
LDR
I
Q
I
GND
PSRR
I
LIM
Enable Input
V
IL
V
IH
I
EN
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
VIN = 5.5V, regulator shutdown
VIN = 5.5V, regulator enabled
VIL
≤
0.4V; VIN = 5.5V
VIH
≥
1.6V; VIN = 5.5V
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Power Good, Note 6
V
PG
V
OL
I
PG
V
PG
Delay
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the loadrange from
0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
5. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the groundpin
current.
6. The power good is a function of the output voltage being 5% low and the detection of one of the following: overcurrent, over-temperature ordropout.
See “Applications Information” section for additional information.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Quiescent Current
Ground Pin Current,
Note 5
Power Supply Rejection
Current Limit
Condition
IOUT = 100µA
VIN = 2.7V to 6V
IOUT = 0.1mA to 150mA,
Note 4
VEN
≤
0.4V (shutdown)
IOUT = 0mA; VIN = 6.0V
IOUT = 150mA; VIN = 6.0V
f = 120Hz, COUT = 4.7µF, IOUT = 150mA
VOUT = 0V
Min
–3
–4
–0.3
Typ
Max
3
4
Units
%
%
%/V
%
µA
µA
µA
dB
mA
0
4.0
0.45
100
100
60
0.3
5.0
1
150
150
160
350
0.4
V
V
µA
µA
°C
°C
%
1.6
0.01
0.01
150
10
Low Threshold
High Threshold
PG Output Logic-Low Voltage
Power Good Leakage Current
Delay Time to Power Good
% of VOUT (PG ON)
% of VOUT (PG OFF)
IL = 100µA, fault condition
power good off, VPG = 5.5V
See “Timing Diagram”
89.5
96.5
0.02
0.01
1
5
0.1
%
V
µA
ms
August 2006
3
M9999-080106
Micrel, Inc.
MIC5248
Block Diagram
Timing Diagram
August 2006
4
M9999-080106
Micrel, Inc.
MIC5248
Typical Characteristics
113
GROUND CURRENT (µA)
111
109
107
105
103
101
99
97
95
2.5 3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
I
OUT
= 150mA
Ground Current vs.
Input Voltage
GROUND CURRENT (µA)
I
OUT
= 100µA
99.4
99.2
99
98.8
98.6
98.4
Ground Current vs.
Output Current
GROUND CURRENT (µA)
V
IN
= 3.3V
110
105
100
95
90
Ground Current vs.
Temperature
I
OUT
= 100µA
I
OUT
= 150mA
98.2
0 20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
85
-40 -20 0 20 40 60 80 100120140
TEMPERATURE °C)
(
360
350
340
330
320
310
300
290
280
270
260
2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1
INPUT VOLTAGE (V)
Short Circuit Current
vs. Input Voltage
SHORT CIRCUIT CURRENT (mA)
SHORT CIRCUIT CURRENT (mA)
320
310
300
290
280
270
Short Circuit Current
vs. Temperature
POWER GOOD DELAY (ms)
V
IN
= 3.3V
260
-40 -20 0 20 40 60 80 100120140
TEMPERATURE °C)
(
2
I
OUT
= 100µA
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1
INPUT VOLTAGE (V)
Power Good Delay
vs. Input Voltage
2
V
IN
= 3.3V
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
-40 -20 0 20 40 60 80 100120140
TEMPERATURE °C)
(
Power Good Delay
vs. Temperature
1.195
OUTPUT VOLTAGE (V)
1.19
1.185
1.18
1.175
Output Voltage
vs. Input Voltage
I
OUT
= 100µA
POWER GOOD DELAY (ms)
I
OUT
= 150mA
1.17
2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1
INPUT VOLTAGE (V)
1.195
OUTPUT VOLTAGE (V)
1.19
1.185
1.18
1.175
1.17
1.165
Output Voltage vs.
Output Current
1.205
OUTPUT VOLTAGE (V)
1.2
1.195
1.19
1.185
Output Voltage vs.
Temperature
ENABLE VOLTAGE (V)
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
Enable Voltage vs.
Input Voltage
1.16
0 20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
V
IN
= 3.3V
1.18
-40 -20 0 20 40 60 80 100120140
TEMPERATURE °C)
(
I
OUT
= 100µA
0.6
2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1
INPUT VOLTAGE (V)
I
OUT
= 100µA
August 2006
5
M9999-080106
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
