MAX1806EUA08+T [MAXIM]
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| 型号： | MAX1806EUA08+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 暂无描述 稳压器 |
| 文件： | 总10页 (文件大小：256K) |
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19-2018; Rev 0; 4/01
500mA, Low-Voltage Linear Regulator in µMAX
General Description
Features
The MAX1806 low-dropout linear regulator operates
from a +2.25V to +5.5V supply and delivers a guaran-
teed 500mA load current with low 175mV dropout. The
high-accuracy ( 1ꢀ% output voltage is preset at an
internally trimmed voltage (see Selector Guide% or can
be adjusted from +0.8V to +4.5V with an external resis-
tive-divider.
o Guaranteed 500mA Output Current
o Output Down to 0.8V
o Low 175mV Dropout at 500mA
o
1ꢀ Output Voꢁtaꢂe Aꢃꢃuraꢃc
Preset at 0.8V, 1.5V, 1.8V, 2.5V, or 3.3V
Adjustabꢁe from 0.8V to 4.5V
An internal PMOS pass transistor allows low 210µA
supply current, making this device ideal for portable
equipment such as personal digital assistants (PDAs%,
cellular phones, cordless phones, and other equip-
ment, including base stations and docking stations.
o Power-OK Output
o Low 210µA Ground Current
o 0.02µA Shutdown Current
o Thermaꢁ Overꢁoad Proteꢃtion
o Output Current Limit
Other features include an active-low, power-OK output
that indicates when the output is out of regulation, a
0.02µA shutdown mode, short-circuit protection, and
thermal shutdown protection. The MAX1806 comes in a
miniature 1.3W, 8-pin power-µMAX package with a
metal pad on the underside of the package.
o Tinc 1.3W, 8-Pin Power-µMAX Paꢃkaꢂe
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
Applications
MAX1806EUA_ _
-40°C to +85°C
8 Power-µMAX
Notebook Computers
Cellular and Cordless Telephones
PDAs
Selector Guide
PART AND SUFFIX
MAX1806EUA33
MAX1806EUA25
MAX1806EUA18
MAX1806EUA15
MAX1806EUA08
V
(V)
TOP MARK
AAAG
AAAH
OUT
3.3
2.5
1.8
1.5
0.8
Palmtop Computers
Base Stations
USB Hubs
AAAI
Docking Stations
AAAJ
AAAK
Typical Operating Circuit
Pin Configuration
V
V
OUT
0.8V TO 4.5V
IN
TOP VIEW
+2.25V TO +5.5V
IN
OUT
C
C
IN
1µF
OUT
10µF
IN
IN
1
8
7
6
5
OUT
OUT
SET
R
POK
100kΩ
2
3
4
MAX1806
MAX1806
ON
POK
SHDN
TO
µC
SHDN
SET
POK
GND
OFF
GND
µMAX
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
500mA, Low-Voltage Linear Regulator in µMAX
ABSOLUTE MAXIMUM RATINGS
Operating Temperature.......................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s% .................................+300°C
IN, SHDN, POK, SET to GND ...................................-0.3V to +6V
OUT to GND ................................................-0.3V to (V + 0.3V%
IN
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (T = +70°C%
A
8-Pin Power-µMAX (derate 17mW/°C above +70°C%.......1.3W
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
+ 500mV or V = +2.25V whichever is greater, SET = GND, SHDN = IN, T = 0°C to +85°C, unless otherwise
IN
OUT(SETPOINT%
IN
A
noted. Typical values are at T = +25°C.%
A
PARAMETER
Input Voltage
SYMBOL
CONDITIONS
MIN
2.25
1.85
-1
TYP
MAX
5.5
UNITS
V
V
V
IN
Input Undervoltage Lockout
V
Rising, 40mV hysteresis
2.0
2.15
+1
UVLO
T
T
= +85°C, I
= +85°C, I
= 100mA
A
A
OUT
OUT
= 1mA to 500mA
-1.5
+1.5
Output Voltage Accuracy
(Preset Mode)
V
%
V
OUT
T
V
= 0°C to +85°C, I
= 1mA to 500mA,
A
OUT
-3
+3
> V
+ 0.5V
IN
OUT
Adjustable Output Voltage
0.8
790
786
4.5
810
814
T
T
T
= +85°C, I
= +85°C, I
= 100mA
A
A
OUT
= 1mA to 500mA
SET Voltage Threshold
(Adjustable Mode)
OUT
V
mV
SET
= 0°C to +85°C, I
= 1mA to 500mA,
A
OUT
774
800
826
V
V
V
> V
+ 0.5V
IN
OUT
Maximum Output Current
Short-Circuit Current Limit
SET Dual Mode™ Threshold
SET Input Bias Current
I
500
700
35
mA
RMS
OUT
I
= 0V
1400
80
2300
125
mA
LIM
OUT
mV
nA
I
= +0.8V
= 1mA
-100
+100
400
SET
SET
OUT
OUT
I
I
210
575
259
201
147
0
Ground-Pin Current
I
µA
Q
= 500mA
V
V
V
= +2.25V
= +2.8V
= +4.0V
384
315
255
0.125
35
OUT
OUT
OUT
Dropout Voltage (Note 1)
I
= 500mA
mV
OUT
Line Regulation
∆V
∆V
V
from (V
+ 100mV) to 5.5V, I = 5mA
LOAD
%/V
LNR
LDR
IN
OUT
Load Regulation
I
= 1mA to 500mA
15.5
300
ppm/mA
OUT
Output Voltage Noise
SHUTDOWN
10Hz to 1MHz, C
= 10µF (ESR < 0.1Ω)
µV
RMS
OUT
Shutdown Supply Current
I
SHDN = GND, V = 5.5V
0.02
5
µA
V
OFF
IN
V
1.6
IH
SHDN Input Threshold
V
0.6
IL
SHDN Input Bias Current
I
SHDN = GND or IN
10
40
100
nA
µs
SHDN
Startup Time
T
C
OUT
= 10µF, time from SHDN high to POK high
START
Dual Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________
2
500mA, Low-Voltage Linear Regulator in µMAX
ELECTRICAL CHARACTERISTICS (continued)
(V = V
+ 500mV or V = +2.25V whichever is greater, SET = GND, SHDN = IN, T = 0°C to +85°C, unless otherwise
IN
OUT(SETPOINT)
IN
A
noted. Typical values are at T = +25°C.)
A
PARAMETER
POWER-OK
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POK Output Low Voltage
V
Sinking 2mA
5
50
mV
V
OL
Operating Voltage Range for
Valid POK Output
Sinking 100µA
1.0
90
5.5
Output High-Leakage Current
Threshold
V
= +5.5V
100
96
nA
%
POK
Rising edge, referred to V
93
OUT(NOMINAL)
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
T
170
20
°C
°C
SHDN
∆T
SHDN
ELECTRICAL CHARACTERISTICS
(V = V
+ 500mV or V = +2.25V whichever is greater, SET = GND, SHDN = IN, T = -40°C to +85°C, unless other-
IN
OUT(SETPOINT)
IN
A
wise noted. Typical values are at T = +25°C.) (Note 2)
A
PARAMETER
Input Voltage
SYMBOL
CONDITIONS
MIN
2.25
1.85
TYP
MAX
5.5
UNITS
V
V
V
IN
Input Undervoltage Lockout
V
Rising, 40mV hysteresis
2.15
UVLO
Output Voltage Accuracy
(Preset Mode)
V
I
= 1mA to 500mA
-4
+4
4.5
834
%
V
OUT
OUT
Adjustable Output Voltage
0.8
766
SET Voltage Threshold
(Adjustable Mode)
V
I
= 1mA to 500mA
= 0V
mV
SET
OUT
Maximum Output Current
Short-Circuit Current Limit
SET Dual Mode™ Threshold
SET Input Bias Current
Ground-Pin Current
I
500
700
35
mA
RMS
OUT
I
V
V
2500
125
mA
LIM
OUT
mV
nA
µA
I
= +0.8V
= 1mA
V
-100
+100
400
SET
SET
I
I
Q
OUT
= +2.25V
= +2.8V
= +4.0V
259
201
147
384
OUT
OUT
OUT
Dropout Voltage (Note 1)
I
= 500mA
mV
V
V
315
OUT
255
Line Regulation
∆V
∆V
V
from (V
+ 100mV) to 5.5V, I = 5mA
LOAD
-0.175
1.6
+0.175
35
%/V
LNR
LDR
IN
OUT
Load Regulation
SHUTDOWN
I
= 1mA to 500mA
ppm/mA
OUT
Shutdown Supply Current
I
SHDN = GND, V = 5.5V
5
µA
V
OFF
IN
V
2.5V < V < 5.5V
IN
IH
SHDN Input Threshold
V
2.5V < V < 5.5V
IN
0.6
IL
SHDN
SHDN Input Bias Current
I
SHDN = GND or IN
100
nA
_______________________________________________________________________________________
3
500mA, Low-Voltage Linear Regulator in µMAX
ELECTRICAL CHARACTERISTICS (continued)
(V = V
+ 500mV or V = +2.25V whichever is greater, SET = GND, SHDN = IN, T = -40°C to +85°C, unless other-
IN
OUT(SETPOINT)
IN
A
wise noted. Typical values are at T = +25°C.) (Note 2)
A
PARAMETER
POWER-OK
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POK Output Low Voltage
V
Sinking 2mA
50
mV
V
OL
Operating Voltage Range for
Valid POK Output
Sinking 100µA
1.0
89
5.5
Output High-Leakage Current
Threshold
V
= +5.5V
100
97
nA
%
POK
Rising edge, referred to V
OUT(NOMINAL)
Note 1: Dropout voltage is defined as V - V
, when V
is 100mV below the value of V
and when V = V
+0.5V.
IN
OUT
OUT
OUT
IN
OUT(NOM)
For 2.25V ≤ V
≤ 4.0V, dropout voltage limits are linearly interpolated from the values listed. For V
< 4.0V, dropout
OUT
OUT
voltage limit is equal to the value for V
= 4.0V.
OUT
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(MAX1806EUA33, V = V
+ 500mV, SHDN = IN, C = 1µF, C
= 10µF, T = +25°C, unless otherwise noted.)
OUT A
IN
OUT
IN
OUTPUT VOLTAGE vs. INPUT VOLTAGE
OUTPUT VOLTAGE vs. LOAD CURRENT
OUTPUT VOLTAGE vs. TEMPERATURE
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
3.32
3.31
3.30
3.29
3.28
3.27
3.26
3.25
3.34
3.33
3.32
3.31
3.30
3.29
3.28
V
OUT
= V
+ 500mV
OUT
IN
I
= 0mA
OUT
I
= 0
I
= 500mA
OUT
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
INPUT VOLTAGE (V)
0
100 200 300 400 500 600 700 800
LOAD CURRENT (mA)
-40
-15
10
35
60
85
TEMPERATURE (°C)
GROUND-PIN CURRENT vs.
INPUT VOLTAGE
DROPOUT VOLTAGE vs.
OUTPUT VOLTAGE
DROPOUT VOLTAGE vs. LOAD CURRENT
400
600
550
500
450
400
350
300
250
200
150
100
50
350
300
250
200
150
100
50
0.28
0.26
0.24
0.22
0.20
0.18
0.16
0.14
I
= 500mA
OUT
T
= +85°C
A
T
= +25°C
A
I
= 0mA
OUT
T
= -40°C
A
0
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
INPUT VOLTAGE (V)
2.0
2.5
3.0
3.5
4.0
4.5
0
100 200 300 400 500 600 700 800
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
4
_______________________________________________________________________________________
500mA, Low-Voltage Linear Regulator in µMAX
Typical Operating Characteristics (continued)
(MAX1806EUA33, V = V
+ 500mV, SHDN = IN, C = 1µF, C
= 10µF, T = +25°C, unless otherwise noted.)
OUT A
IN
OUT
IN
GROUND-PIN CURRENT vs.
LOAD CURRENT
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
GROUND-PIN CURRENT vs.
TEMPERATURE
500
450
400
350
300
250
200
150
100
-60
-50
-40
200
190
180
170
160
150
V
I
= V
OUT
+ 500mV
OUT
= 0
IN
V
= 5.5V
IN
V
= 3.8V
IN
-30
-20
-10
0
C
OUT
= 10µF
OUT
= 50mA
I
0
100 200 300 400 500 600 700 800
LOAD CURRENT (A)
0.01
0.1
1
10
100
1000
-40
-15
10
35
60
85
FREQUENCY (kHz)
TEMPERATURE (°C)
OUTPUT SPECTRAL NOISE DENSITY
vs. FREQUENCY
OUTPUT NOISE DC TO 1MHz
MAX1806 toc11
10
1
C
= 10µF
OUT
= 50mA
I
OUT
V
OUT
1mV/div
0.1
0.01
V
R
= 3.3V
= 66Ω (50mA)
OUT
OUT
0.001
0.1
1
10
100
1000
20ms/div
FREQUENCY (kHz)
REGION OF STABLE C
ESR
OUT
vs. LOAD CURRENT
LOAD-TRANSIENT RESPONSE
MAX1806 toc13
100
10
I
OUT
200mA/div
C
= 10µF
OUT
1
V
OUT
20mV/div
STABLE REGION
0.1
0.01
V
= V
+ 500mV
OUT
IN
C
IN
= 10µF
R
= 660Ω TO 6.6Ω (5mA TO 500mA)
OUT
0
100 200 300 400 500 600 700 800
FREQUENCY (kHz)
10µs/div
_______________________________________________________________________________________
5
500mA, Low-Voltage Linear Regulator in µMAX
Typical Operating Characteristics (continued)
(MAX1806EUA33, V = V
+ 500mV, SHDN = IN, C = 1µF, C
= 10µF, T = +25°C, unless otherwise noted.)
IN
OUT
IN
OUT
A
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
NEAR DROPOUT
MAX1806 toc14
MAX1806 toc15
6V
V
I
IN
1V/div
OUT
200mA/div
3V
V
OUT
50mV/div
V
= V
+ 100mV
OUT
IN
V
OUT
C
IN
= 10µF
10mV/div
R
= 660Ω TO
OUT
6.6Ω (5mA TO 500mA)
10µs/div
200µs/div
POK WAVEFORM
SHUTDOWN WAVEFORM
MAX1806 toc17
MAX1806 toc16
5V
2V
V
IN
2V/div
V
SHDN
1V/div
0
0
V
OUT
2V/div
3V
0
V
OUT
1V/div
V
POK
2V/div
0
0
R = 66Ω (50mA)
OUT
R
= 6.6Ω (500mA)
OUT
200µs/div
20µs/div
Pin Description
PIN
NAME
FUNCTION
Regulator Input. Supply voltage can range from +2.25V to +5.5V. Bypass with a 1µF capacitor to GND (see
Capacitor Selection and Regulation Stability). Connect both input pins together externally.
1, 2
IN
Open-Drain, Active-Low Power-OK Output. POK remains low while the output voltage (V
POK threshold. Connect a 100kΩ pullup resistor from POK to OUT.
) is below the
OUT
3
4
POK
SHDN
GND
SET
Active-Low Shutdown Input. A logic low at SHDN reduces supply current to 0.02µA. In shutdown, the POK
output is low. Connect SHDN to IN for normal operation.
Ground. This pin and the exposed pad also function as a heatsink. Solder both to a large pad or to the
circuit-board ground plane to maximize power dissipation.
5
Voltage-Setting Input. Connect SET to GND for preset output. Connect an external resistive voltage-divider
from OUT to SET to set the output voltage between 0.8V and 4.5V. The SET regulation voltage is 800mV.
6
Regulator Output. OUT sources up to 500mA. Bypass OUT with a 10µF low-ESR capacitor to GND.
Connect both OUT pins together externally.
7, 8
OUT
6
_______________________________________________________________________________________
500mA, Low-Voltage Linear Regulator in µMAX
current drops to 0.02µA. When in shutdown, POK pulls
Detailed Description
low. The capacitance and load at OUT determine the
The MAX1806 is a low-dropout, low-quiescent-current
rate at which V
decays. SHDN can be pulled as
OUT
linear regulator. The device supplies loads up to
500mA and is available with preset output voltages. As
illustrated in Figure 1, the MAX1806 includes a 0.8V ref-
erence, error amplifier, P-channel pass transistor, and
internal feedback voltage-divider.
high as +6V, regardless of the input and output voltage.
Power-OK Output
The POK output pulls low when OUT is less than 93% of
the nominal regulation voltage. Once OUT exceeds
93% of the nominal voltage, POK goes high imped-
ance. POK is an open-drain N-channel output. To
obtain a logic voltage output, connect a pullup resistor
from POK to OUT. A 100kΩ resistor works well for most
applications. POK can be used to signal a microcon-
troller (µC), or drive an external LED to indicate power
failure. When the MAX1806 is shutdown, POK is held
low independent of the output voltage. If unused, leave
POK grounded or unconnected.
The reference is connected to the error amplifier, which
compares it 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
increasing the output voltage. If the feedback voltage 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 either an inter-
nal resistive voltage-divider connected to OUT or an
external resistor network connected to SET. The dual-
Current Limit
The MAX1806 monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 1.4A
(typ). The output can be shorted to ground for an indefi-
nite period of time without damaging the part.
mode comparator examines V
and selects the feed-
SET
back path. If V
is below 35mV, the internal feedback
SET
path is used, and the output is regulated to the factory-
preset voltage. Additional blocks include an output cur-
rent limiter, thermal sensor, and shutdown logic.
Thermal Overload Protection
Thermal overload protection limits total power dissipa-
tion in the MAX1806. When the junction temperature
Internal P-Channel Pass Transistor
The MAX1806 features a 0.4Ω P-channel MOSFET pass
transistor. Unlike similar designs using PNP pass tran-
sistors, P-channel MOSFETs require no base drive,
which reduces operating current. PNP-based regula-
tors also waste considerable current in dropout when
the pass transistor saturates, and use high base-drive
currents under large loads. The MAX1806 does not suf-
fer from these problems.
exceeds T = +170°C, a thermal sensor turns off the
J
pass transistor, allowing the device to cool. The thermal
sensor turns the pass transistor on again after the junc-
tion temperature cools by 20°C, resulting in a pulsed
output during continuous thermal overload conditions.
Thermal overload protection protects the MAX1806 in
the event of fault conditions. For continuous operation,
do not exceed the absolute maximum junction-temper-
ature rating of T = +150°C.
J
Output Voltage Selection
The MAX1806’s dual-mode operation allows operation
in either a preset voltage mode or an adjustable mode.
Connect SET to GND to select the preset output volt-
age. The two-digit part number suffix identifies the out-
put voltage (see Selector Guide). For example, the
MAX1806EUA33 has a preset 3.3V output voltage. The
output voltage may also be adjusted by connecting a
voltage-divider from OUT to SET (Figure 2). Select R2 in
the 25kΩ to 100kΩ range. Calculate R1 with the follow-
ing equation:
Operating Region and Power Dissipation
The MAX1806’s maximum power dissipation depends
on the thermal resistance of the IC package and circuit
board, the temperature difference between the die
junction and ambient air, and the rate of air flow. The
✕
power dissipated in the device is P = I
OUT
1.3W or:
(V
-
IN
OUT
V
). The maximum allowed power dissipation is
PMAX = (T
- T ) / (θ + θ
)
CA
J(MAX)
A
JC
where T - T is the temperature difference between the
J
A
R1 = R2 [(V
/ V ) - 1]
SET
OUT
MAX1806 die junction and the surrounding air, θ is
JC
where V
to 4.5V.
= 0.8V, and V
may range from 0.8V
OUT
SET
the thermal resistance from the junction to the case,
and θ
is the thermal resistance from the case
CA
through the PC board, copper traces, and other materi-
als to the surrounding air. The MAX1806 package fea-
tures an exposed thermal pad on its underside. This
pad lowers the package’s thermal resistance by provid-
Shutdown
Drive SHDN low to enter shutdown. During shutdown,
the output is disconnected from the input, and supply
_______________________________________________________________________________________
7
500mA, Low-Voltage Linear Regulator in µMAX
V
IN
+2.25V TO +5.5V
IN
IN
C
IN
1µF
THERMAL
SENSOR
MOSFET
PRESET MODE
DRIVER WITH
I
LIM
V
OUT
0.8V TO 3.3V
OUT
OUT
ON
SHDN
C
OUT
10µF
OFF
SHUTDOWN
LOGIC
V
REF
0.8V
ERROR
AMPLIFIER
LOGIC SUPPLY
VOLTAGE (V
)
OUT
R
POK
100kΩ
MAX1806
POK
TO
µC
SET
93% V
80mV
REF
GND
Figure 1. Functional Diagram
ing a direct heat conduction path from the die to the PC
board. Connect the exposed backside pad and GND to
the system ground using a large pad or ground plane,
or multiple vias to the ground plane layer.
output capacitors. The output capacitor’s (C
) ESR
OUT
affects stability and output noise. Use output capacitors
with an ESR of 0.1Ω or less to ensure stability and opti-
mum transient response. Surface-mount ceramic
capacitors have very low ESR and are commonly avail-
The MAX1806 delivers up to 0.5A(RMS) and operates
with input voltages up to 5.5V, but not simultaneously.
High output currents can only be sustained when input-
output differential is within the limits outlined.
able in values up to 10µF. Connect C and C
IN
close to the MAX1806 as possible.
as
OUT
Noise, PSRR, and Transient Response
The MAX1806 is designed to operate with low dropout
voltages and low quiescent currents, while still main-
taining good noise, transient response, and AC rejec-
tion. See the Typical Operating Characteristics for a
plot of Power-Supply Rejection Ratio (PSRR) vs. Freq-
uency. When operating from noisy sources, improved
supply-noise rejection and transient response can be
achieved by increasing the values of the input and
output bypass capacitors and through passive-
filtering techniques. The MAX1806 load-transient
Applications Information
Capacitor Selection and Regulator
Stability
Connect a 1µF capacitor between IN and ground and a
10µF low equivalent series resistance (ESR) capacitor
between OUT and ground. The input capacitor (C
)
IN
lowers the source impedance of the input supply.
Reduce noise and improve load-transient response,
stability, and power-supply rejection by using larger
8
_______________________________________________________________________________________
500mA, Low-Voltage Linear Regulator in µMAX
0.8
V
CONTINUOUS CURRENT LIMIT
OUT
R1 = R2
- 1
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.8V
IN
IN
OUT
OUT
V
IN
T = +50°C
A
+2.25V TO +5.5V
V
OUT
T = +85°C
A
C
C
OUT
10µF
IN
1µF
R
1
T = +70°C
A
MAX1806
TYPICAL V
LIMIT
DROPOUT
ON
POWER-µMAX PACKAGE OPERATING
REGION AT TJ(MAX) = +150°C
SHDN
POK
SET
OFF
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V)
R
2
Figure 3. Power Operating Regions: Maximum Output Current
vs. Supply Voltage
GND
Figure 2. Adjustable Output Using External Feedback Resistors
response graphs (see Typical Operating Characteris-
tics) 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 overshoot for a step change in the load cur-
rent from 5mA to 500mA is 40mV. Increasing the output
capacitor’s value and decreasing the ESR attenuates
the overshoot.
Input-Output (Dropout) Voltage
A regulator’s minimum input-to-output voltage differen-
tial (dropout voltage) determines the lowest usable sup-
ply voltage. In battery-powered systems, this
determines the useful end-of-life battery voltage.
Because the MAX1806 uses a P-channel MOSFET pass
transistor, its dropout voltage is a function of drain-to-
source on-resistance (R
) multiplied by the load
DS(ON)
current (see Typical Operating Characteristics):
✕
V
= V - V
= R
I
OUT
DROPOUT
IN
OUT
DS(ON)
Chip Information
TRANSISTOR COUNT: 949
_______________________________________________________________________________________
9
500mA, Low-Voltage Linear Regulator in µMAX
Package Information
Note: The MAX1806 has on exposed thermal pad on the bottom side of the package.
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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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