MIC5248 DATA SHEET (11/05/2015) DOWNLOAD

MIC5248
150mA µCap CMOS LDO Regulator
w/Power Good
General Description
Features
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.
•
•
•
•
•
•
•
•
•
•
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
VOUT
COUT
GND
EN
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
Marking
Voltage*
Junction Temp. Range
Package
Lead Finish
MIC5248-1.2BM5
LV12
1.2V
–40° to +125°C
5-Pin SOT-23
Standard
MIC5248-1.2YM5
KV12
1.2V
–40° to +125°C
5-Pin SOT-23
Pb-Free
MIC5248-1.2YML
12V
1.2V
–40° to +125°C
6-Pin 2x2 MLF
®
Pb-Free
*Other Voltage available. Contact Micrel for details.
Pin Configuration
EN 1
6 PG
GND 2
5 NC
IN 3
MIC5248-x.xBM5
MIC5248-x.xYM5
4 OUT
MIC5248-x.xYML
Pin Description
Pin Number
6-Pin MLF
5-Pin SOT-23
1
3
EN
2
2
GND
3
1
IN
4
5
OUT
5
–
NC
No Connect
6
4
PG
Power Good Output
August 2006
Pin Number
Pin Name
Pin Name
Enable/Shutdown (Input): CMOS compatible input. Logic high
= enable; logic low = shutdown. Do not leave open.
Ground
Supply Input
Regulator Output
2
M9999-080106
Micrel, Inc.
MIC5248
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN).................................... 0V to +7V
Enable Input Voltage (VEN)..................................... 0V to VIN
Flag Output Voltage (VPG) ...................................... 0V to VIN
Junction Temperature (TJ) ....................................... +150°C
Storage Temperature (TS).........................–65°C to +150°C
Lead Temperature (soldering, 5sec.)......................... 260°C
EDS Rating(3)
Input Voltage (VIN)........................................... +2.7V to +6V
Enable Input Voltage (VEN)..................................... 0V to VIN
Flag Output Voltage (VPG) ...................................... 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Thermal Resistance
SOT-23-5 (θJA).................................................235°C/W
MLF-6 (θJA) ......................................................100°C/W
Electrical Characteristics
VIN = 2.7V, VEN = VIN; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C< TJ < +125°C, unless noted.
Symbol
Parameter
Condition
VO
Output Voltage Accuracy
IOUT = 100µA
∆VLNR
Line Regulation
VIN = 2.7V to 6V
∆VLDR
Load Regulation
Min
Typ
–3
–4
Max
Units
3
%
4
%
0
0.3
%/V
IOUT = 0.1mA to 150mA, Note 4
4.0
5.0
%
–0.3
IQ
Quiescent Current
VEN ≤ 0.4V (shutdown)
0.45
1
µA
IGND
Ground Pin Current, Note 5
IOUT = 0mA; VIN = 6.0V
100
150
µA
IOUT = 150mA; VIN = 6.0V
100
150
µA
60
dB
350
mA
PSRR
Power Supply Rejection
f = 120Hz, COUT = 4.7µF, IOUT = 150mA
ILIM
Current Limit
VOUT = 0V
Enable Input Logic-Low Voltage
VIN = 5.5V, regulator shutdown
160
Enable Input
VIL
0.4
1.6
V
VIH
Enable Input Logic-High Voltage
VIN = 5.5V, regulator enabled
IEN
Enable Input Current
VIL ≤ 0.4V; VIN = 5.5V
0.01
µA
V
VIH ≥ 1.6V; VIN = 5.5V
0.01
µA
Thermal Protection
Thermal Shutdown Temperature
150
°C
Thermal Shutdown Hysteresis
10
°C
Power Good, Note 6
VPG
Low Threshold
% of VOUT (PG ON)
High Threshold
% of VOUT (PG OFF)
89.5
VOL
PG Output Logic-Low Voltage
IL = 100µA, fault condition
0.02
IPG
Power Good Leakage Current
power good off, VPG = 5.5V
0.01
VPG Delay
Delay Time to Power Good
See “Timing Diagram”
1
%
96.5
%
0.1
V
µA
5
ms
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.
August 2006
3
M9999-080106
Micrel, Inc.
MIC5248
Block Diagram
Timing Diagram
August 2006
4
M9999-080106
Micrel, Inc.
MIC5248
Typical Characteristics
109
107
105
103
IOUT = 150mA
101
99
97
99.4
95
2.5 3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
99.2
99
98.8
98.6
98.4
SHORT CIRCUIT CURRENT (mA)
SHORT CIRCUIT CURRENT (mA)
110
320
310
300
290
280
270
1.175
1.17
1.165
VIN = 3.3V
1.16
0 20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
August 2006
OUTPUT VOLTAGE (V)
1.19
Output Voltage
vs. Input Voltage
IOUT = 100µA
1.185
1.18
1.175
1.205
Output Voltage vs.
Temperature
1.4
ENABLE VOLTAGE (V)
1.18
2
IOUT = 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)
IOUT = 150mA
1.17
2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
POWER GOOD DELAY (ms)
OUTPUT VOLTAGE (V)
1.185
IOUT = 150mA
90
1.195
Output Voltage vs.
Output Current
1.19
95
Power Good Delay
vs. Input Voltage
260
-40 -20 0 20 40 60 80 100120140
TEMPERATURE °C)
(
2
VIN = 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)
(
IOUT = 100µA
100
Short Circuit Current
vs. Temperature
VIN = 3.3V
Ground Current vs.
Temperature
85
-40 -20 0 20 40 60 80 100120140
TEMPERATURE °C)
(
Power Good Delay
vs. Temperature
1.195
105
98.2
0 20 40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
Short Circuit Current
vs. Input Voltage
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)
VIN = 3.3V
GROUND CURRENT (µA)
IOUT = 100µA
Ground Current vs.
Output Current
POWER GOOD DELAY (ms)
111
GROUND CURRENT (µA)
GROUND CURRENT (µA)
113
Ground Current vs.
Input Voltage
1.2
1.195
1.19
1.185
IOUT = 100µA
1.18
-40 -20 0 20 40 60 80 100120140
TEMPERATURE °C)
(
5
Enable Voltage vs.
Input Voltage
1.3
1.2
1.1
1
0.9
0.8
0.7
IOUT = 100µA
0.6
2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1
INPUT VOLTAGE (V)
M9999-080106
Micrel, Inc.
MIC5248
ENABLE VOLTAGE (V)
1.2
Enable Voltage vs.
Temperature
VIN = 3.3V
1.15
1.1
1.05
1
0.95
0.9
0.85
0.8
-40 -20 0 20 40 60 80 100120140
TEMPERATURE °C)
(
August 2006
6
M9999-080106
Micrel, Inc.
MIC5248
circuitry that drives the open drain transistor to indicate a
fault.
Application Information
Enable/Shutdown
The MIC5248 comes with an active-high enable pin that
allows the regulator to be disabled. Forcing the enable
pin low disables the regulator and sends it into a “zero”
off-mode-current state. In this state, current consumed
by the regulator goes nearly to zero. Forcing the enable
pin high enables the output voltage. This part is CMOS
and the enable pin cannot be left floating; a floating
enable pin may cause an indeterminate state on the
output.
Transient Response
The MIC5248 implements a unique output stage to
dramatically improve transient response recovery time.
The output is a totem-pole configuration with a Pchannel MOSFET pass device and an N-channel
MOSFET clamp. The N-channel clamp is a significantly
smaller device that prevents the output voltage from
overshooting when a heavy load is removed. This
feature helps to speed up the transient response by
significantly decreasing transient response recovery time
during the transition from heavy load (100mA) to light
load (100µA).
Input Capacitor
An input capacitor is not required for stability. A 1µF
input capacitor is recommended when the bulk ac supply
capacitance is more than 10 inches away from the
device, or when the supply is a battery.
Active Shutdown
The MIC5248 also features an active shutdown clamp,
which is an N-channel MOSFET that turns on when the
device is disabled. This allows the output capacitor and
load to discharge, de-energizing the load
Output Capacitor
The MIC5248 requires an output capacitor for stability.
The design requires 1µF or greater on the output to
maintain stability. The capacitor can be a low-ESR
ceramic chip capacitor. The MIC5248 has been
designed to work specifically with the low-cost, small
chip capacitors. Tantalum capacitors can also be used
for improved capacitance overtemperature. The value of
the capacitor can be increased without bound.
X7R dielectric ceramic capacitors are recommended
because of their temperature performance. X7R-type
capacitors change capacitance by 15% over their
operating temperature range and are the most stable
type of ceramic capacitors. Z5U and Y5V dielectric
capacitors change value by as much 50% and 60%
respectively over their operating temperature ranges. To
use a ceramic chip capacitor with Y5V dielectric, the
value must be much higher than an X7R ceramic or a
tantalum capacitor to ensure the same minimum
capacitance value over the operating temperature range.
Tantalum capacitors have a very stable dielectric (10%
over their operating temperature range) and can also be
used with this device.
Thermal Considerations
The MIC5248 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:
⎛ TJ(max) − TA
PD(max) = ⎜⎜
θ JA
⎝
TJ(max) is the maximum junction temperature of the
die,125°C, and TA is the ambient operating temperature.
θJA is layout dependent; Table 1 shows examples of
junction-to-ambient thermal resistance for the MIC5248.
Package
θJA Recommended
Minimum Footprint
θJA 1” Square
Copper Clad
θJC
SOT-23-5 (M5)
235°C/W
185°C/W
145°C/W
Table 1. SOT-23-5 Thermal Resistance
Power Good
The Power Good output is an open-drain output. It is
designed essentially to work as a power-on reset
generator once the regulated voltage was up and/or a
fault condition. The output of the Power Good drives low
when a fault condition AND an undervoltage detection
occurs. The Power Good output come back up once the
output has reached 96.5% of its nominal value and a
1ms to 5ms delay has passed. See “Timing Diagram.”
The MIC5248’s internal circuit intelligently monitors
overcurrent, overtemperature and dropout conditions
and ORs these outputs together to indicate some fault
condition. This output is fed into an on-board delay
August 2006
⎞
⎟
⎟
⎠
The actual power dissipation of the regulator circuit can
be determined using the equation:
PD = (VIN – VOUT) IOUT + VIN IGND
Substituting PD(max) for PD and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5248-1.2BM5 at
50°C with a minimum footprint layout, the maximum
input voltage for a set output current can be determined
as follows:
⎛ 125°C − 50°C ⎞
PD(max) = ⎜
⎟
⎝ 235°C/W ⎠
7
M9999-080106
Micrel, Inc.
MIC5248
Therefore, a 1.2V application at 150mA of output current
can accept a maximum input voltage of 3.4V in a SOT23-5package. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the
Regulator Thermals section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook.
PD(max) = 315mW
The junction-to-ambient thermal resistance for the
minimum footprint is 235°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using the output voltage of 1.2V and
an output current of 150mA, the maximum input voltage
can be determined. Because this device is CMOS and
the ground current is typically 100µA over the load
range, the power dissipation contributed by the ground
current is < 1% and can be ignored for this calculation.
315mW = (VIN – 1.2V) 150mA
315mW = VIN × 150mA – 195mW
510mW = VIN × 150mA
VIN(max) = 3.4V
August 2006
Dual-Supply Operation
When used in dual supply systems where the regulator
load is returned to a negative supply, the output voltage
must be diode clamped to ground.
8
M9999-080106
Micrel, Inc.
MIC5248
Package Information
5-Pin SOT-23 (M5)
6-Pin 2x2 MLF® (ML)
August 2006
9
M9999-080106
Micrel, Inc.
MIC5248
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2001 Micrel, Incorporated.
August 2006
10
M9999-080106