MICREL MIC5202

MIC5202
Micrel
MIC5202
Dual 100mA Low-Dropout Voltage Regulator
Preliminary Information
General Description
Features
The MIC5202 is a family of dual linear voltage regulators with
very low dropout voltage (typically 17mV at light loads and
210mV at 100mA), and very low ground current (1mA at
100mA output–each section), offering better than 1% initial
accuracy with a logic compatible ON/OFF switching input.
Designed especially for hand-held battery powered devices,
the MIC5202 is switched by a CMOS or TTL compatible logic
signal. This ENABLE control my be tied directly to VIN if
unneeded. When disabled, power consumption drops nearly
to zero. The ground current of the MIC5202 increases only
slightly in dropout, further prolonging battery life. Key MIC5202
features include protection against reversed battery, current
limiting, and over-temperature shutdown.
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The MIC5202 is available in several fixed voltages. Other
options are available; contact Micrel for details.
High output voltage accuracy
Variety of output voltages
Guaranteed 100mA output
Low quiescent current
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 shutdown
Available in SO-8 package
Applications
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Cellular Telephones
Laptop, Notebook, and Palmtop Computers
Battery Powered Equipment
PCMCIA VCC and VPP Regulation/Switching
Bar Code Scanners
SMPS Post-Regulator/ DC to DC Modules
High Efficiency Linear Power Supplies
Ordering Information
Part Number
Pin Configuration
Volts Accuracy Temperature Range* Package
MIC5202-3.0BM
3.0
1%
–40°C to +125°C
SO-8
MIC5202-3.3BM
3.3
1%
–40°C to +125°C
SO-8
MIC5202-4.8BM
4.85
1%
–40°C to +125°C
SO-8
MIC5202-5.0BM
5.0
1%
–40°C to +125°C
SO-8
* Junction Temperature
Other voltages are available; contact Micrel for details.
Output A
Enable A
Output B
Enable B
ENABLE pins may be tied directly to VIN
3-135
GROUND
ENABLE (B)
Both GROUND pins must be tied to
the same potential. VIN (A) and VIN (B) may run
from separate supplies.
MIC5202-3.3
July 1998
VIN (A)
ENABLE (A)
VIN (B)
MIC5202-xxBM
Typical Application
1µ (x2)
VOUT (A)
GROUND
VOUT (B)
3
MIC5202
Micrel
Absolute Maximum Ratings
Recommended Operating Conditions
Absolute Maximum Ratings indicate limits beyond which damage
to the device may occur. Electrical specifications do not apply when
operating the device beyond its specified Operating Ratings.
Input Voltage ............................................................... 2.5V to 26V
Operating Junction Temperature Range ............. –40°C to +125°C
ENABLE Input Voltage ..................................................... 0V to VIN
Power Dissipation ............................................... Internally Limited
Lead Temperature (Soldering, 5 seconds) .......................... 260°C
Operating Junction Temperature Range ............. –40°C to +125°C
Input Supply Voltage ................................................ –20V to +60V
ENABLE Input Voltage ............................................. –20V to +60V
SO-8 θJA ....................................................................... See Note 1
Electrical Characteristics
Limits in standard typeface are for TJ = 25°C and limits in boldface apply over the junction temperature range of –40°C to +125°C.
Specifications are for each half of the (dual) MIC5202. Unless otherwise specified, VIN = VOUT + 1V, IL = 1mA, CL = 10µF, and VCONTROL
≥ 2.0V.
Symbol
Parameter
Condition
Min
VO
Output Voltage
Variation from specified VOUT
Accuracy
∆VO
∆T
Output Voltage
Temperature Coef.
(Note 2)
∆VO
VO
Line Regulation
∆VO
VO
VIN – VO
Typ
Max
Units
1
2
%
40
150
ppm/°C
VIN = VOUT + 1 V to 26V
0.004
0.10
0.40
%
Load Regulation
IL = 0.1mA to 100mA (Note 3)
0.04
0.16
0.30
%
Dropout Voltage
(Note 4)
IL = 100µA
IL = 20mA
IL = 30mA
IL = 50mA
IL = 100mA
17
130
150
180
225
–1
–2
mV
350
IQ
Quiescent Current
VCONTROL ≤ 0.7V (Shutdown)
0.01
µA
IGND
Ground Pin Current
VCONTROL ≥ 2.0V, IL = 100µA
IL = 20mA
IL = 30mA
IL = 50mA
IL = 100mA
170
270
330
500
1200
µA
1500
PSRR
Ripple Rejection
75
dB
IGNDDO
Ground Pin
Current at Dropout
VIN = 0.5V less specified VOUT, IL = 100µA
(Note 5)
270
ILIMIT
Current Limit
VOUT = 0V
280
mA
∆VO
∆PD
Thermal Regulation
(Note 6)
0.05
%/W
en
Output Noise
100
µV
330
µA
Control Input
VIL
IIL
IH
Input Voltage Level
Logic Low
Logic High
Control Input Current
OFF
ON
0.7
V
2.0
VIL ≤ 0.7V
VIH ≥ 2.0V
0.01
8
3-136
µA
50
July 1998
MIC5202
Micrel
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not
apply when operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a
function of the maximum junction temperature, TJ(MAX) the junction-to-ambient thermal resistance, θJA, and the ambient
temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: P(MAX) =
(TJ(MAX) – TA) / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the
regulator will go into thermal shutdown. The junction to ambient thermal resistance of the MIC5202BM is 160°C/W mounted
on a PC board.
Note 2:
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 3:
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 100mA. Changes in output voltage due to heating effects are covered by the thermal regulation
specification.
Note 4:
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 5:
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 6:
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 100mA load pulse at VIN = 26V for t = 10ms, and is measured separately
for each section.
3
Typical Characteristics (Each Regulator—2 Regulators/Package)
Dropout Voltage
vs. Output Current
Dropout Voltage
vs. Temperature
0.4
150
100
50
0
0.01
0.3
IL = 100mA
0.2
0.1
IL = 1mA
0.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
0.1
1
10
100 1000
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
1
0.1
0.01
July 1998
0.1
1
10
100
OUTPUT CURRENT (mA)
1.2
IL = 100mA
0.8
0.6
0.4
IL = 1mA
0.2
0.0
0
2
4
6
8
SUPPLY VOLTAGE (V)
3-137
2.0
1.5
1.0
IL = 100µA, 1mA
0.5
0
2
4
6
8
INPUT VOLTAGE (V)
10
3.5
1.4
1.0
IL = 100mA
2.5
Output Voltage
vs. Output Current
Ground Current
vs. Supply Voltage
1.6
GROUND CURRENT (mA)
GROUND CURRENT (mA)
10
3.0
0.0
OUTPUT VOLTAGE (V)
200
3.5
OUTPUT VOLTAGE (V)
DROPOUT VOLTAGE (V)
DROPOUT VOLTAGE (mV)
250
Dropout
Characteristics
10
3.0
2.5
2.0
CIN = 2.2µF
COUT = 4.7µF
1.5
1.0
0.5
0.0
0.0
0.1
0.2
OUTPUT CURRENT (A)
0.3
MIC5202
Micrel
Ground Current
vs. Temperature
Ground Current
vs. Temperature
0.20
0.15
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
3.3
CURVES APPLICABLE
AT 100µA AND 100mA
3.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
OUTPUT (mA) ∆ OUTPUT (mV)
200
150
CIN = 2.2µF
COUT = 4.7µF
VOUT = 3.3V
2
3
4
5
6
INPUT VOLTAGE (V)
VOUT = 3.3V
200
180
160
140
VOUT = 0V
(SHORT CIRCUIT)
120
100
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
0
-10
200
100
0
-2
0
2
4
6
TIME (ms)
∆ OUTPUT (mV)
100
80
60
8
3.28
0
3.25
3.24
3.23
3.22
3.21
3.20
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
20
0 1 2 3 4 5 6 7 8 9 10
SUPPLY VOLTAGE (V)
20
10
0
-10
-20
-30
300
CL = 47µF
200
100
0
-10
0
4
0.2
0.4
TIME (ms)
3-138
40
CL = 10 µF
IL = 1mA
10
6
0
30
Line Transient
-5
2
-0.2
10
20
TIME (ms)
15
8
-10
RL = 33Ω
10 15 20 25 30 35
TIME (ms)
CIN = 2.2µF
COUT = 4.7µF
ILOAD = 1mA
3.27
3.26
10
CL = 1 µF
IL = 1mA
5
5
3.30
3.29
Line Transient
10
INPUT (V)
SUPPLY CURRENT (mA)
CL = 4.7µF
-20
-30
300
Supply Current vs. Supply
Voltage (3.3V Version)
0
0
Load Transient
20
10
7
120
40
0
INPUT (V)
SHORT CIRCUIT CURRENT (mA)
250
1
100
Minimum Input Voltage
vs. Temperature
260
240
220
CL = 4.7 µF
200
-50
Load Transient
300
50
0
-100
-5
150
300
280
Short Circuit Current
vs. Input Voltage
100
∆ OUTPUT (mV)
0
50
100
TEMPERATURE (°C)
OUTPUT (mA) ∆ OUTPUT (mV)
3.1
1.1
50
∆ OUTPUT (mV)
3 DEVICES:
HI / AVG / LO
1.2
MIN. INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
3.4
3.2
ILOAD = 100mA
CIN = 2.2µF
COUT = 4.7µF
100
Output Current
vs. Temperature
CIN = 2.2µF
COUT = 4.7µF
3.5
1.3
1.0
-50
Output Voltage vs. Temp.
(3.3V Version)
3.6
1.4
LOAD (mA)
ILOAD = 100µA
CIN = 2.2µF
COUT = 4.7µF
0.25
0
Thermal Regulation
(3.3V Version)
1.5
GROUND CURRENT (mA)
GROUND CURRENT (mA)
0.30
0.6
0.8
5
0
8
-5
6
4
2
-0.1
0
0.1 0.2 0.3 0.4 0.5 0.6
TIME (ms)
July 1998
MIC5202
Micrel
Enable Transient
(3.3V Version)
30
RL = 66Ω
20
10
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
2
0
-2
-50
7
ENABLE CURRENT (µA)
10
IL = 1mA
1
0.1
0.01
2
0
50 100 150 200 250 300
TIME (µs)
1.6
CIN = 2.2µF
COUT = 4.7µF
30
25
20
15
VEN = 5V
10
5
0
0
Enable Voltage Threshold
vs. Temperature
VEN = 2V
-5
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
1x106
100x103
10x103
100x100
10x100
1x100
IL = 100mA
1x103
OUTPUT IMPEDANCE (Ω)
IL = 100µA
CL = 4.7 µF
IL = 100mA
-2
-50
50 100 150 200 250 300
TIME (µs)
35
1000
0.001
0
5
4
3
2
1
0
4
-1
Enable Current Threshold
vs. Temperature
Output Impedance
100
CL = 4.7 µF
IL = 1mA
ENABLE VOLTAGE (V)
0
Enable Transient
(3.3V Version)
ENABLE (V)
OUTPUT (V)
40
ENABLE (V)
SUPPLY CURRENT (mA)
50
5
4
3
2
1
0
4
-1
OUTPUT (V)
Supply Current vs. Supply
Voltage (3.3V Version)
60
CIN = 2.2µF
COUT = 4.7µF
1.4
1.2
1
3
ON
0.8
OFF
0.6
0.4
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
FREQUENCY (Hz)
Ripple
vs. Frequency
FREQUENCY (Hz)
July 1998
FREQUENCY (Hz)
3-139
40
FREQUENCY (Hz)
1x106
0
100x103
20
10x103
0
1x106
20
IL = 100mA
60
1x103
40
80
100x100
RIPPLE VOLTAGE (dB)
60
100x103
1x106
100x10
3
10x103
10x100
0
1x103
20
IL = 1mA
10x103
40
80
1x103
60
100
100x100
IL = 100µA
10x100
80
RIPPLE VOLTAGE (dB)
100
100x100
RIPPLE VOLTAGE (dB)
100
Ripple
vs. Frequency
10x100
Ripple
vs. Frequency
MIC5202
Micrel
Applications Information
Thermal Considerations
Part I. Layout
External Capacitors
A 1µF capacitor is recommended between the MIC5202
output and ground to prevent oscillations due to instability.
Larger values serve to improve the regulator's transient
response. Most types of tantalum or aluminum electrolytics
will be adequate; film types will work, but are costly and
therefore not recommended. Many aluminum electrolytics
have electrolytes that freeze at about –30°C, so solid tantalums
are recommended for operation below –25°C. The important
parameters of the capacitor are an effective series resistance
of about 5Ω or less and a resonant frequency above 500kHz.
The value of this capacitor may be increased without limit.
At lower values of 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 currents below
1 mA. A 1µF capacitor should be placed from the MIC5202
input to ground if there is more than 10 inches of wire between
the input and the AC filter capacitor or if a battery is used as
the supply.
ENABLE Input
The MIC5202 features nearly zero OFF mode current. When
the ENABLE input is held below 0.7V, all internal circuitry is
powered off. Pulling this pin high (over 2.0V) re-enables the
device and allows operation. The ENABLE pin requires a
small amount of current, typically 15µA. While the logic
threshold is TTL/CMOS compatible, ENABLE may be pulled
as high as 30V, independent of the voltage on VIN. The two
portions of the MIC5202 may be enabled separately.
The MIC5202-xxBM (8-pin surface mount package) has the
following thermal characteristics when mounted on a single
layer copper-clad printed circuit board.
θJA
PC Board
Dielectric
FR4
Ceramic
160°C/W
120°C/W
Multi-layer boards having a ground plane, wide traces near
the pads, and large supply bus lines provide better thermal
conductivity.
The "worst case" value of 160°C/W assumes no ground plane,
minimum trace widths, and a FR4 material board.
Part II. Nominal Power Dissipation and Die Temperature
The MIC5202-xxBM at a 25°C ambient temperature will
operate reliably at up to 625mW power dissipation when
mounted in the "worst case" manner described above. At an
ambient temperature of 55°C, the device may safely dissipate
440mW. These power levels are equivalent to a die temperature of 125°C, the recommended maximum temperature for
non-military grade silicon integrated circuits.
General Notes
The MIC5202 will remain stable and in regulation with no load
in addition to the internal voltage divider, unlike many other
voltage regulators. This is especially important in CMOS
RAM keep-alive applications. Thermal shutdown is
independant on both halfs of the dual MIC5202, however an
over-temperature condition on one half might affect the other
because of proximity. 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.
Both MIC5202 GROUND pins must be tied to the same
ground potential. Isolation between the two halfs allows
connecting the two VIN pins to different supplies.
3-140
50 mil
245 mil
150 mil
30 mil
50 mil
Minimum recommended board pad size, SO-8.
July 1998