MAX8868EZK30 [MAXIM]
Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23;
| 型号： | MAX8868EZK30 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23 |
| 文件： | 总8页 (文件大小：116K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1302; Rev 1; 3/98
Lo w -No is e , Lo w -Dro p o u t ,
1 5 0 m A Lin e a r Re g u la t o rs in S OT2 3
7/MAX68
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
The MAX8867/MAX8868 low-noise, low-dropout linear
regulators operate from a 2.5V to 6.5V input and deliver
up to 150mA. Typical output noise for these devices is
♦ Low Output Noise: 30µV
RMS
♦ Low 55mV Dropout at 50mA Output
(165mV at 150mA output)
just 30µV
, and typical dropout is only 165mV at
RMS
150mA. The output voltage is preset to voltages in the
ra ng e of 2.5V to 5.0V, in 100mV inc re me nts . The
MAX8867 and MAX8868 are pin-compatible with the
MAX8863 and MAX8864, except for the BP pin.
♦ Low 85µA No-Load Supply Current
♦ Low 100µA Operating Supply Current
(even in dropout)
Designed with an internal P-channel MOSFET pass
tra ns is tor, the MAX8867/MAX8868 ma inta in a low
100µA supply current, independent of the load current
and dropout voltage. Other features include a 10nA
logic-controlled shutdown mode, short-circuit and ther-
mal-shutdown protection, and reverse battery protec-
tion. The MAX8868 also includes an auto-discharge
function, which actively discharges the output voltage
to ground when the device is placed in shutdown. Both
devices come in a miniature 5-pin SOT23 package.
♦ Thermal-Overload and Short-Circuit Protection
♦ Reverse Battery Protection
♦ Output Current Limit
♦ Preset Output Voltages (±1.4% accuracy)
♦ 10nA Logic-Controlled Shutdown
______________Ord e rin g In fo rm a t io n
________________________Ap p lic a t io n s
PART**
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
Cellular Telephones
Cordless Telephones
PCS Telephones
PCMCIA Cards
Modems
MAX8867C/Dxy
MAX8867EUKxy-T
MAX8868C/Dxy
MAX8868EUKxy-T
Hand-Held Instruments
Palmtop Computers
Electronic Planners
5 SOT23-5
Dice*
5 SOT23-5
*Dice are tested at T = +25°C.
**xy is the output voltage code (see Expanded Ordering
Information table).
A
__________________P in Co n fig u ra t io n
TOP VIEW
SHDN
GND
IN
1
2
3
5
4
BP
___Ex p a n d e d Ord e rin g In fo rm a t io n
MAX8867
MAX8868
PRESET
SOT TOP MARK
MAX8867 MAX8868
ACAY ACBF
OUTPUT
VOLTAGE (xy)
CODE
OUTPUT
VOLTAGE
(V)
OUT
MAX886_EUK25
MAX886_EUK28
MAX886_EUK29
MAX886_EUK30
MAX886_EUK32
MAX886_EUK33
MAX886_EUK36
MAX886_EUK50
Other xy***
2.50
2.80
2.84
3.00
3.15
3.30
3.60
5.00
x.y0
SOT23-5
ACAZ
ACBA
ACBB
ACBC
ACBD
ACCZ
ACBE
—
ACBG
ACBH
ACBI
ACBJ
ACBK
ACDA
ACBL
—
__________Typ ic a l Op e ra t in g Circ u it
INPUT
2.5V TO 6.5V
OUTPUT
PRESET
2.5V TO 5.0V
150mA
IN
OUT
C
IN
C
OUT
1µF
1µF
MAX8867
MAX8868
SHDN
OFF
ON
BP
***Other xy between 2.5V and 5.0V are available in 100mV incre-
ments. Contact factory for other versions. Minimum order
quantity is 25,000 units.
C
GND
BP
0.01µF
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
Lo w -No is e , Lo w -Dro p o u t ,
1 5 0 m A Lin e a r Re g u la t o rs in S OT2 3
ABSOLUTE MAXIMUM RATINGS
IN to GND....................................................................-7V to +7V
Output Short-Circuit Duration ............................................Infinite
SHDN to GND..............................................................-7V to +7V
SHDN to IN...............................................................-7V to +0.3V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
..................................................................................140°C/W
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
θ
JB
OUT, BP to GND..........................................-0.3V to (V + 0.3V)
IN
Continuous Power Dissipation (T = +70°C)
A
SOT23-5 (derate 7.1mW/°C above +70°C)...................571mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V = V
+ 0.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
IN
OUT(NOMINAL)
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
2.5
TYP
MAX
6.5
1.4
2
UNITS
Input Voltage (Note 2)
V
IN
V
7/MAX68
I
= 0mA, T = +25°C
-1.4
-3
OUT
A
Output Voltage Accuracy
%
I
= 0mA to 120mA
OUT
Maximum Output Current
Current Limit
150
160
mA
mA
I
390
85
LIM
No load
180
120
Ground Pin Current
I
Q
µA
I
= 150mA
= 1mA
100
1.1
55
OUT
I
OUT
I
= 50mA
= 150mA
Dropout Voltage (Note 2)
mV
OUT
I
165
0
OUT
Line Regulation
Load Regulation
∆V
V
IN
= (V
+ 0.1V) to 6.5V, I = 1mA
OUT
-0.15
0.15
0.04
%/V
LNR
OUT
∆V
I
= 0mA to 120mA, C = 1µF
OUT
0.01
30
%/mA
LDR
OUT
C
C
= 10µF
OUT
OUT
f = 10Hz to 100kHz,
Output Voltage Noise
SHUTDOWN
e
µV
RMS
n
C
= 0.01µF
BP
= 100µF
20
V
V
= 2.5V to 5.5V
= 2.5V to 5.5V
IN
2.0
IH
IN
V
nA
µA
µs
SHDN Input Threshold
V
IL
V
0.4
T
= +25°C
0.01
0.5
100
A
I
V
SHDN
= V
SHDN Input Bias Current
SHDN
IN
T
A
= +85°C
T
A
= +25°C
0.01
0.2
1
Shutdown Supply Current
I
V
OUT
= 0V
Q, SHDN
T
A
= +85°C
T
A
= +25°C
30
150
300
Shutdown Exit Delay
(Note 3)
C
C
= 0.1µF,
BP
= 1µF, no load
OUT
T
A
= -40°C to +85°C
Shutdown Discharge
Resistance
MAX8868 only
300
Ω
2
_______________________________________________________________________________________
Lo w -No is e , Lo w -Dro p o u t ,
1 5 0 m A Lin e a r Re g u la t o rs in S OT2 3
7/MAX68
ELECTRICAL CHARACTERISTICS (continued)
(V = V
+ 0.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
IN
OUT(NOMINAL)
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
THERMAL PROTECTION
Thermal Shutdown
Temperature
T
155
15
°C
°C
SHDN
Thermal Shutdown
Hysteresis
∆T
SHDN
Note 1: Limits are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed through
A
correlation using Statistical Quality Control (SQC) Methods.
Note 2: The dropout voltage is defined as V - V
, when V
is 100mV below the value of V
for V = V
+ 0.5V.
IN
OUT
OUT
OUT
IN
OUT
Note 3: Time needed for V
to reach 95% of final value.
OUT
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = V
IN
+ 0.5V, C = 1µF, C
= 1µF, C = 0.01µF, T = +25°C, unless otherwise noted.)
OUT(NOMINAL)
IN
OUT
BP
A
GROUND PIN CURRENT
vs. LOAD CURRENT
MAX886_EUK25
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX886_EUK50
OUTPUT VOLTAGE vs. LOAD CURRENT
110
105
100
95
2.60
2.55
2.50
5.2
5.1
5.0
MAX886_EUK50
MAX886_EUK25
90
85
80
75
2.45
2.40
4.9
4.8
70
65
60
0
50
100
150
0
50
100
150
0
50
100
150
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAX886_EUK50
MAX886_EUK25
GROUND PIN CURRENT vs. INPUT VOLTAGE
OUTPUT VOLTAGE vs. INPUT VOLTAGE
GROUND PIN CURRENT vs. INPUT VOLTAGE
6
5
120
100
120
100
I
= 50mA
I
= 50mA
LOAD
LOAD
MAX886_EUK50
4
3
2
1
0
80
60
40
20
0
80
60
40
20
0
NO LOAD
NO LOAD
MAX886_EUK25
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
Lo w -No is e , Lo w -Dro p o u t ,
1 5 0 m A Lin e a r Re g u la t o rs in S OT2 3
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = V
+ 0.5V, C = 1µF, C
= 1µF, C = 0.01µF, T = +25°C, unless otherwise noted.)
IN
OUT(NOMINAL)
IN
OUT
BP
A
MAX886_EUK25
OUTPUT VOLTAGE vs. TEMPERATURE
MAX886_EUK50
OUTPUT VOLTAGE vs. TEMPERATURE
GROUND PIN CURRENT vs. TEMPERATURE
2.60
2.55
200
180
160
140
120
100
80
5.20
I
= 50mA
LOAD
I
= 50mA
LOAD
I
= 50mA
LOAD
5.10
5.00
4.90
4.80
MAX886_EUK50
MAX886_EUK25
2.50
2.45
2.40
60
40
20
0
-40 -20
0
20
40
60
80
100
-40 -20
0
20
40
60
80
100
-40 -20
0
20
40
60
80
100
7/MAX68
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX886_EUK25
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX886_EUK50
DROPOUT VOLTAGE vs. LOAD CURRENT
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
70
60
50
40
30
20
10
0
250
200
150
100
50
200
150
T = +85°C
A
C
= 10µF
OUT
T = +85°C
A
T = +25°C
A
C
OUT
= 1µF
100
50
0
T = +25°C
A
T = -40°C
A
T = -40°C
A
I
C
= 50mA
= 0.1µF
LOAD
BP
0
0
20 40 60 80 100 120 140 160
LOAD CURRENT (mA)
0
20 40 60 80 100 120 140 160
LOAD CURRENT (mA)
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
OUTPUT NOISE vs. BP CAPACITANCE
OUTPUT NOISE vs. LOAD CURRENT
10
1
80
70
60
C
= 10µF
= 0.01µF
OUT
C = 10µF
OUT
C
= 0.01µF
= 10mA
BP
C
BP
I = 10mA
I
LOAD
LOAD
50
40
30
20
f = 10Hz TO 100kHz
f = 10Hz TO 100kHz
MAX886_EUK50
MAX886_EUK30
60
50
40
30
20
MAX886_EUK50
MAX886_EUK30
C
= 1µF
OUT
0.1
0.01
MAX886_EUK25
MAX886_EUK25
10
0
C
= 10µF
OUT
10
0
0.1
1
10
FREQUENCY (kHz)
100
1000
0.001
0.01
BP CAPACITANCE (µF)
0.1
1
10
100
LOAD CURRENT (mA)
4
_______________________________________________________________________________________
Lo w -No is e , Lo w -Dro p o u t ,
1 5 0 m A Lin e a r Re g u la t o rs in S OT2 3
7/MAX68
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = V
IN
+ 0.5V, C = 1µF, C
= 1µF, C = 0.01µF, T = +25°C, unless otherwise noted.)
OUT BP A
OUT(NOMINAL)
IN
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
MAX8867/8-18
MAX8867/8-19
MAX8867/8-20
4V
3V
3.01V
3.00V
2.99V
3.01V
V
IN
3.00V
2.99V
V
OUT
V
OUT
3.001V
2.999V
V
OUT
50mA
0mA
50mA
0mA
I
LOAD
I
LOAD
100µs/div
= 50mA
10µs/div
MAX886_EUK30, V = V + 0.5V,
10µs/div
MAX886_EUK30, V = V + 0.1V,
MAX886_EUK30, I
LOAD
IN OUT
IN OUT
C
= 10µF, I
= 0mA TO 50mA
IN
LOAD
C
= 10µF, I
= 0mA TO 50mA
IN
LOAD
MAX8868
ENTERING SHUTDOWN
MAX886_EUK50
SHUTDOWN EXIT DELAY
MAX886_EUK25
SHUTDOWN EXIT DELAY
MAX8867/8-25
MAX8867-23
MAX8867-21
2V
0V
V
SHDN
V
SHDN
V
SHDN
2V
0V
2V
0V
C
BP
= 0.01µF
C
BP
= 0.01µF
V
OUT
4V
V
OUT
2V
1V
0V
C
BP
= 0.1µF
V
OUT
C
BP
= 0.1µF
2V
0V
0V
500µs/div
5µs/div
5µs/div
NO LOAD
I
= 50mA
I
= 50mA
LOAD
LOAD
MAX886_EUK25
REGION OF STABLE C
ESR
OUT
10Hz TO 100kHz OUTPUT NOISE
vs. LOAD CURRENT
100
10
1
C
= 10µF
OUT
C
= 1µF
OUT
V
OUT
50µV/div
STABLE REGION
0.1
0.01
0
20
40 60 80 100 120 140
LOAD CURRENT (mA)
1ms/div
C
OUT
= 10µF, C = 0.1µF, I
= 10mA
BP
LOAD
_______________________________________________________________________________________
5
Lo w -No is e , Lo w -Dro p o u t ,
1 5 0 m A Lin e a r Re g u la t o rs in S OT2 3
______________________________________________________________P in De s c rip t io n
PIN
NAME
FUNCTION
Active-Low Shutdown Input. A logic low reduces the supply current to 10nA. On the MAX8868, a logic low
also causes the output voltage to discharge to GND. Connect to IN for normal operation.
1
SHDN
Ground. This pin also functions as a heatsink. Solder to a large pad or the circuit-board ground plane to
maximize power dissipation.
2
GND
Regulator Input. Supply voltage can range from 2.5V to 6.5V. Bypass with a 1µF capacitor to GND (see
Capacitor Selection and Regulator Stability section).
3
4
5
IN
OUT
BP
Regulator Output. Sources up to 150mA. Bypass with a 1µF (<0.2Ω typical ESR) capacitor to GND.
Reference-Noise Bypass. Bypass with a low-leakage, 0.01µF ceramic capacitor for reduced noise at the
output.
REVERSE
BATTERY
PROTECTION
IN
7/MAX68
SHDN
MOS DRIVER
P
ERROR
AMP
WITH I
LIMIT
SHUTDOWN
AND POWER-ON
CONTROL
MAX8867
MAX8868
OUT
N
*
1.25V
REF
THERMAL
SENSOR
GND
* AUTO-DISCHARGE, MAX8868 ONLY
BP
Figure 1. Functional Diagram
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
this reference with the feedback voltage and amplifies
the difference. If the feedback voltage is lower than the
reference voltage, the pass-transistor gate is pulled
lower, which allows more current to pass to the output
and increases the output voltage. If the feedback volt-
age is too high, the pass-transistor gate is pulled up,
allowing less current to pass to the output. The output
voltage is fed back through an internal resistor voltage
divider connected to the OUT pin.
_______________De t a ile d De s c rip t io n
The MAX8867/MAX8868 are low-noise, low-dropout,
low-quiescent-current linear regulators designed pri-
marily for battery-powered applications. The parts are
available with preset output voltages varying from 2.5V
to 5.0V in 100mV increments. These devices can sup-
ply loads up to 150mA. As illustrated in Figure 1, the
MAX8867/MAX8868 consist of a 1.25V reference, error
amplifier, P-channel pass transistor, and internal feed-
back voltage divider.
6
_______________________________________________________________________________________
Lo w -No is e , Lo w -Dro p o u t ,
1 5 0 m A Lin e a r Re g u la t o rs in S OT2 3
7/MAX68
An external bypass capacitor connected to the BP pin
Op e ra t in g Re g io n a n d P o w e r Dis s ip a t io n
The MAX8867/MAX8868’s maximum power dissipation
depends on the thermal resistance of the case and cir-
cuit board, the temperature difference between the die
junction and ambient air, and the rate of air flow. The
reduces noise at the output. Additional blocks include a
current limiter, reverse battery protection, thermal sen-
sor, and shutdown logic. The MAX8868 also includes
an auto-discharge function, which actively discharges
the output voltage to ground when the device is placed
in shutdown mode.
power dissipation across the device is P = I
(V
OUT IN
-
V ). The maximum power dissipation is:
OUT
P
= (T - T ) / (θ + θ
)
BA
MAX
J
A
JB
Ou t p u t Vo lt a g e
The MAX8867/MAX8868 are supplied with factory-set
output voltages from 2.5V to 5V, in 100mV increments.
Except for the MAX886_EUK29 and the MAX886_EUK32
(which have an output voltage preset at 2.84V and
3.15V, respectively), the two-digit suffix allows the cus-
tomer to choose the output voltage in 100mV increments.
For example, the MAX8867EUK33 has a preset output
voltage of 3.3V. (see Expanded Ordering Information).
where T - T is the temperature difference between the
J
A
MAX8867/MAX8868 die junction and the surrounding
air, θ (or θ ) is the thermal resistance of the pack-
JB
JC
age, and θ
is the thermal resistance through the
BA
printed circuit board, copper traces, and other materi-
als to the surrounding air.
The GND pin of the MAX8867/MAX8868 performs the
dual function of providing an electrical connection to
ground and channeling heat away. Connect the GND
pin to ground using a large pad or ground plane.
In t e rn a l P -Ch a n n e l P a s s Tra n s is t o r
The MAX8867/MAX8868 feature a 1.1Ω typical P-chan-
ne l MOSFET p a s s tra ns is tor. This p rovid e s s e ve ra l
advantages over similar designs using PNP pass tran-
sistors, including longer battery life. The P-channel
MOSFET requires no base drive, which reduces quies-
cent current considerably. PNP-based regulators waste
considerable current in dropout when the pass transis-
tor saturates. They also use high base-drive currents
under large loads. The MAX8867/MAX8868 do not suf-
fer from these problems and consume only 100µA of
quiescent current whether in dropout, light-load, or
heavy-load applications (see the Typical Operating
Characteristics).
Re ve rs e Ba t t e ry P ro t e c t io n
The MAX8867/MAX8868 ha ve a uniq ue p rote c tion
scheme that limits the reverse supply current to 1mA
when either V or V
falls below ground. Their cir-
IN
SHDN
cuitry monitors the polarity of these two pins and dis-
connects the internal circuitry and parasitic diodes
when the battery is reversed. This feature prevents
device damage.
No is e Re d u c t io n
An external 0.01µF bypass capacitor at BP, in conjunction
with an internal 200kΩ resistor, creates a 80Hz lowpass
filter for noise reduction. The MAX8867/MAX8868 exhibit
Cu rre n t Lim it
The MAX8867/MAX8868 include a current limiter, which
monitors and controls the pass transistor’s gate voltage,
limiting the output current to 390mA. For design purposes,
consider the current limit to be 160mA minimum to 500mA
maximum. The output can be shorted to ground for an
indefinite amount of time without damaging the part.
30µV
a nd C
of output voltage noise with C
= 0.01µF
RMS
BP
= 10µF. Start-up time is minimized by a
OUT
power-on circuit that pre-charges the bypass capacitor.
The Typical Operating Characteristics show graphs of
Noise vs. BP Capacitance, Noise vs. Load Current, and
Output Noise Spectral Density.
__________Ap p lic a t io n s In fo rm a t io n
Th e rm a l-Ove rlo a d P ro t e c t io n
Thermal-overload protection limits total power dissipa-
tion in the MAX8867/MAX8868. When the junction tem-
Ca p a c it o r S e le c t io n a n d
Re g u la t o r S t a b ilit y
perature exceeds T = +170°C, the thermal sensor
Norma lly, us e a 1µF c a p a c itor on the MAX8867/
MAX8868’s input and a 1µF to 10µF capacitor on the
output. Larger input capacitor values and lower ESRs
provide better supply-noise rejection and line-transient
response. Reduce noise and improve load-transient
re s p ons e , s ta b ility, a nd p owe r-s up p ly re je c tion b y
using large output capacitors. For stable operation over
the full temperature range and with load currents up to
150mA, a minimum of 1µF is recommended. Note that
some ceramic dielectrics exhibit large capacitance and
J
signals the shutdown logic, turning off the pass transis-
tor and allowing the IC to cool. The thermal sensor will
turn the pass transistor on again after the IC’s junction
temperature cools by 20°C, resulting in a pulsed output
during continuous thermal-overload conditions.
Thermal-overload protection is designed to protect the
MAX8867/MAX8868 in the event of fault conditions. For
continual operation, do not exceed the absolute maxi-
mum junction-temperature rating of T = +150°C.
J
_______________________________________________________________________________________
7
Lo w -No is e , Lo w -Dro p o u t ,
1 5 0 m A Lin e a r Re g u la t o rs in S OT2 3
ESR variation with temperature. With dielectrics such as
Z5U and Y5V, it may be necessary to use 2.2µF or
more to ensure stability at temperatures below -10°C.
With X7R or X5R dielectrics, 1µF should be sufficient at
all operating temperatures. Also, for high-ESR tantalum
capacitors, 2.2µF or more may be needed to maintain
ESR in the stable region. A graph of the Region of
Whe n op e ra ting from s ourc e s othe r tha n b a tte rie s ,
improved supply-noise rejection and transient response
can be achieved by increasing the values of the input
and output bypass capacitors, and through passive filter-
ing techniques. The Typical Operating Characteristics
show the MAX8867/MAX8868’s line- and load-transient
responses.
Stable C
Typical Operating Characteristics.
ESR vs. Load Current is shown in the
OUT
Lo a d -Tra n s ie n t Co n s id e ra t io n s
The MAX8867/MAX8868 loa d -tra ns ie nt re s p ons e
graphs (see Typical Operating Characteristics) show
two components of the output response: a DC shift
from the output impedance due to the load current
change, and the transient response. A typical transient
for a step change in the load current from 0mA to 50mA
is 12mV. Increasing the output capacitor’s value and
decreasing the ESR attenuates the overshoot.
Use a 0.01µF bypass capacitor at BP for low output volt-
a g e nois e . Inc re a s ing the c a p a c ita nc e will s lig htly
decrease the output noise, but increase the start-up time.
Values above 0.1µF provide no performance advantage
and are not recommended (see Shutdown Exit Delay
graph in the Typical Operating Characteristics).
P S RR a n d Op e ra t io n fro m
S o u rc e s Ot h e r t h a n Ba t t e rie s
In p u t -Ou t p u t (Dro p o u t ) Vo lt a g e
A regulator’s minimum input-output voltage differential
(or dropout voltage) determines the lowest usable sup-
ply voltage. In battery-powered systems, this will deter-
mine the useful end-of-life battery voltage. Because the
MAX8867/MAX8868 use a P-channel MOSFET pass
transistor, their dropout voltage is a function of drain-to-
The MAX8867/MAX8868 are designed to deliver low
dropout voltages and low quiescent currents in battery-
powered systems. Power-supply rejection is 63dB at
low frequencies and rolls off above 10kHz. See the
Power-Supply Rejection Ratio Frequency graph in the
Typical Operating Characteristics.
7/MAX68
source on-resistance (R
) multiplied by the load
DS(ON)
current (see Typical Operating Characteristics).
___________________Ch ip In fo rm a t io n
TRANSISTOR COUNT: 247
SUBSTRATE CONNECTED TO GND
________________________________________________________P a c k a g e In fo rm a t io n
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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