MIC5258 DATA SHEET (11/05/2015) DOWNLOAD

MIC5258
Micrel, Inc.
MIC5258
150mA µCap CMOS LDO Regulator w/Power Good
General Description
Features
The MIC5258 is an efficient, precise CMOS voltage regulator with power good output. The MIC5258 offers better than
3% initial accuracy, and constant ground current (typically
100µA)over load .
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The MIC5258 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Key features include current limit, thermal shutdown, a pushpull output for faster transient response, and an active clamp to
speed up device turnoff. Available in the IttyBitty™ SOT-23-5
package, the MIC5258 is a fixed 1.2V regulator.
Power Good indicator
Load independent, ultralow 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
Part Number
Standard
Marking
Pb-Free
Marking
MIC5258-1.2BM5
LN12
MIC5258-1.2YM5
KN12
Voltage
Junction Temp.
Range*
Package
1.2V
–40ºC to +125ºC
SOT-23-5
* Other voltages available. Contact Micrel marketing for information.
Typical Application
47k
VIN
MIC5258-x.xBM5
1
5
COUT
2
Enable
Shutdown
VOUT
3
4
PG
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
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
April 2006
1
MIC5258
MIC5258
Micrel, Inc.
Pin Configuration
EN GND IN
2
3
1
LNxx
KNxx
4
5
PG
OUT
MIC5258-x.xBM5/YM5
Pin Description
Pin Number
MIC5258
Pin Name
Pin Function
1
IN
2
GND
Supply Input
3
EN
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
4
PG
Power Good Output
5
OUT
Ground
Regulator Output
2
April 2006
MIC5258
Micrel, Inc.
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 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 ................................ –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ........................ 260°C
ESD, Note 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(θJA).......................................................235°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
Conditions
VO
Output Voltage Accuracy
IOUT = 100µA
ΔVLNR
Line Regulation
VIN = 2.7V to 6V
IQ
Quiescent Current
ΔVLDR
Load Regulation
IGND
Ground Pin Current, Note 5
Min
–0.3
0.3
%/V
3.5
4
%
1
µA
110
150
µA
IOUT = 150mA; VIN = 6.0V
110
150
µA
IOUT = 0mA; VIN = 6.0V
f = 120Hz, COUT = 4.7µF, IOUT = 150mA
Power Supply Rejection
Current Limit
VOUT = 0V
VIL
Enable Input Logic-Low Voltage
VIN = 5.5V, regulator shutdown
IEN
Enable Input Current
Enable Input Logic-High Voltage
%
%
0.45
PSRR
VIH
Units
3
4
IOUT = 0.1mA to 150mA, Note 4
Typical
VEN ≤ 0.4V (shutdown) PG = NC
ILIM
Enable Input
Max
–3
–4
VIN = 5.5V, regulator enabled
160
tbd
dB
350
mA
0.4
1.6
V
0.01
µA
0.01
µA
Thermal Shutdown Temperature
150
°C
Thermal Shutdown Hysteresis
10
°C
Thermal Protection
VIL ≤ 0.4V; VIN = 5.5V
V
VIH ≥ 1.6V; VIN = 5.5V
Power Good , Note 6
VPG
Low Threshold
High Threshold
VOL
PG Output Logic-Low Voltage
IPG
Power Good Leakage Current
VPG Delay
Delay time to Power Good
% of VOUT (PG ON)
% of VOUT (PG OFF)
89
IL = 100µA, fault condition
power good off, VPG = 5.5V
See Timing Diagram
97
0.02
0.1
0.01
1
%
%
V
µA
5
ms
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.
Devices are ESD sensitive. Handling precautions recommended.
Note 4.
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.
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.
The power good is a function of the output voltage being 5% low and the detection of one of the following: overcurrent, overtemperature or
dropout. See “Applications Information” section for additional information.
Note 5.
Note 6.
April 2006
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MIC5258
MIC5258
Micrel, Inc.
Block Diagram
IN
EN
Reference
Voltage
Startup/
Shutdown
Control
Quickstart
PULL
UP
Thermal
Sensor
FAULT
Error
Amplifier
Undervoltage
Lockout
Current
Amplifier
ACTIVE SHUTDOWN
OUT
PULL
DOWN
Out of
Regulation
Detection
PG
Overcurrent
Dropout
Detection
Delay
GND
Timing Diagram
VOUT
97%
89%
97%
Fault Condition
VEN
VPG
MIC5258
Min - Max
1-5ms
1-5ms
4
April 2006
MIC5258
Micrel, Inc.
Typical Characteristics
IOUT = 100µA
109
99.4
99.2
107
IOUT = 150mA
101
2.0
VIN = 3.3V
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
-40 -20 0 20 40 60 80 100120140
TEMPERATURE(°C)
Output Voltage vs.
Output Current
1.190
1.185
Short Circuit Current
vs. Temperature
400
VIN = 3.3V
380
360
340
320
300
280
260
240
220
200
-40 -20 0 20 40 60 80 100120140
TEMPERATURE(°C)
Power Good Pull-up Resistor
vs. Power Good
3.5
3.0
P ower Good
1.5
1.195
1.175
P ower F ail
0.5
PULL-UP RESISTOR (k Ω)
Output Voltage vs.
Temperature
1.4
1.175
1.190
0.9
April 2006
Enable Voltage vs.
Input Voltage
1.2
1.1
VIN = 3.3V
1.160
0 20 40 60 80 100120 140160
OUTPUT CURRENT (mA)
IOUT = 150mA
1.3
1.200
1.195
1.165
IOUT = 100µA
1.170
2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1
INPUT VOLTAGE (V)
1.180
1.170
Output Voltage
vs. Input Voltage
1.180
1.0
1.205
2.0
IOUT = 100µA
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
2.6 3.1 3.6 4.1 4.6 5.1 5.6 6.1
INPUT VOLTAGE (V)
1.185
2.0
0.0
Power Good Delay
vs. Input Voltage
1.190
2.5
10000
Power Good Delay
vs. Temperature
85
-40 -20 02 04 06 08 0 100120140
TEMPERATURE (°C)
1000
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)
98.2
02 04 06 08 0 100120140160
OUTPUT CURRENT (mA)
10
Short Circuit Current
vs. Input Voltage
IOUT = 150mA
90
100
95
2.5 3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
IOUT = 100µA
98.4
1
97
1.195
95
98.6
99
Ground Current vs.
Temperature
100
98.8
0 .0 0 1
103
105
99
SHORT CIRCUIT CURRENT (mA)
105
110
VIN = 3.3V
0 .1
111
Ground Current vs.
Output Current
0 .0 1
113
Ground Current vs.
Input Voltage
1.0
0.8
1.185
IOUT = 100µA
1.180
-40 -20 0 20 40 60 80 100120140
TEMPERATURE(°C)
5
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)
MIC5258
MIC5258
Micrel, Inc.
1.20
Enable Voltage vs.
Temperature
VIN = 3.3V
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
-40 -20 0 20 40 60 80 100120140
TEMPERATURE(°C)
Power Good Characteristic
TIME (250µs/div)
MIC5258
6
April 2006
MIC5258
Micrel, Inc.
Applications Information
Transient Response
The MIC5258 implements a unique output stage to dramatically improve transient response recovery time. The output is
a totem-pole configuration with a P-channel 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).
Enable/Shutdown
The MIC5258 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.
Input Capacitor
Active Shutdown
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.
The MIC5258 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
Thermal Considerations
The MIC5258 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 MIC5258 has been designed to work specifically with
the low-cost, small chip capacitors. Tantalum capacitors can
also be used for improved capacitance over temperature. The
value of the capacitor can be increased without bound.
The MIC5258 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:
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.
PD(max) =
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 MIC5258.
Package
θJA Recommended
Minimum Footprint
θJA 1” Square
Copper Clad
θJC
235°C/W
185°C/W
145°C/W
SOT-23-5 (M5)
Table 1. SOT-23-5 Thermal Resistance
The actual power dissipation of the regulator circuit can be
determined using the equation:
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 comes back up once the output has reached 97% of
its nominal value and a 1ms to 5ms delay has passed. See
Timing Diagram.
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 MIC5258-1.2BM5 at 50°C with
a minimum footprint layout, the maximum input voltage for a
set output current can be determined as follows:
The MIC5258’s internal circuit intelligently monitors overcurrent, overtemperature and dropout conditions and ORs thes
outputs together ti indicate some fault condition. this output
is fed into an on-board delay circuitry that drives the open
drain transistor to indicate a fault.
April 2006
TJ(max) - TA
θJA
PD (max) =
125°C - 50°C
235°C/W
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.
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MIC5258
MIC5258
Micrel, Inc.
315mW = (VIN – 1.2V) 150mA
315mW = VIN ·150mA – 195mW
510mW = VIN·150mA
VIN(max) = 3.4V
Therefore, a 1.2V application at 150mA of output current
can accept a maximum input voltage of 3.4V in a SOT-23-5
package. 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.
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.
MIC5258
8
April 2006
MIC5258
Micrel, Inc.
Package Information
SOT-23-5 (M)
MICREL INC.
TEL
2180 FORTUNE DRIVE
SAN JOSE, CA 95131
USA
+ 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
This 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
April 2006
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MIC5258