MAX1819 [MAXIM]
500mA Low-Dropout Linear Regulator in UCSP ; 500毫安低压差线性稳压器，UCSP封装\n
| 型号： | MAX1819 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 500mA Low-Dropout Linear Regulator in UCSP
|
| 文件： | 总9页 (文件大小：274K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2072; Rev 0; 1/02
500mA Low-Dropout Linear Regulator in UCSP
General Description
Features
The MAX1819 low-dropout linear regulator operates from
a 2.5V to 5.5V supply and delivers a guaranteed 500mA
load current with low 120mV dropout. The high-accuracy
( 1ꢀ% output voltage is preset at an internally trimmed
voltage (see the Selector Guide% or can be adjusted from
1.25V to 5V with an external resistive-divider.
o Guaranteed 500mA Output Current
o Low 90mV Dropout at 500mA
o ±±1 ꢀnꢁtꢁaꢂ Output Aꢃꢃuraꢃc
o Preset Output at ±.5V, ±.8V, 2V, 2.5V, 3.3V, 5V
o Adjustabꢂe Output from ±.25V to 5V
o Power-OK Output
An internal PMOS pass transistor allows the low 125µA
supply current to remain independent of load, making
this device ideal for portable battery-operated equip-
ment such as personal digital assistants (PDAs%, cellu-
lar phones, cordless phones, base stations, and
notebook computers.
Other features include an active-low, open-drain reset
output that indicates when the output is out of regula-
tion, a 0.1µA shutdown, short-circuit protection, and
thermal shutdown protection. The device is available in
a miniature 6-pin UCSP™ package.
o Low ±25µA Ground Current
o 0.±µA Shutdown Current
o Thermaꢂ Overꢂoad Proteꢃtꢁon
o Output Current Lꢁmꢁt
o Tꢁnc 840mW 6-Pꢁn UCSP Paꢃkage
Ordering Information
PART
TEMP RANGE
PꢀN-PACKAGE
Applications
MAX1819EBL_ _ -T*
-40°C to +85°C 6 UCSP
Notebook Computers
Cellular and Cordless Telephones
Personal Digital Assistants (PDAs%
Palmtop Computers
Base Stations
*Insert the desired two-digit suffix (see Selector Guide) into the
blanks to complete the part number.
Selector Guide
PART AND
SUFFꢀX
USB Hubs
V
OUT
UCSP MARK
Docking Stations
MAX1819EBL 15
MAX1819EBL 18
MAX1819EBL 20
MAX1819EBL 25
MAX1819EBL 33
MAX1819EBL 50
1.5V or Adj
1.8V or Adj
2V or Adj
AAH
AAG
AAC
AAD
AAE
AAF
UCSP is a trademark of Maxim Integrated Products, Inc.
2.5V or Adj
3.3V or Adj
5V or Adj
Pin Configuration
Typical Operating Circuit
TOP VIEW
V
= 2.5V TO 5.5V
IN
IN
(TOP OF PC BOARD/
BALLS SOLDERED DOWN)
2
3
1
V
OUT
IN
OUT
IN
A1
POK
A2
SHDN
A3
C
OUT
3.3µF
C
A
B
C
1µF
MAX1819
R
POK
100kΩ
MAX1819
ON
TO
µC
SHDN
SET
POK
GND
OUT
C1
OFF
GND
C3
SET
C2
UCSP
________________________________________________________________ Maxim Integrated Products
±
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-Dropout Linear Regulator in UCSP
Linear Regulator in
ABSOLUTE MAXꢀMUM RATꢀNGS
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Soldering Temperature (10s)...........................................+300°C
IN, SHDN, POK, SET to GND ...................................-0.3V to +6V
OUT to GND ................................................-0.3V to (V + 0.3V)
Output Short-Circuit Duration ...............................................1min
IN
Continuous Power Dissipation (T = +70°C) (Note 1)
A
6-Pin UCSP (derate 10.5mW/°C above +70°C)............840mW
Note ±: Thermal properties are specified with product mounted on PC board with one square-inch of copper area and still air.
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.
ELECTRꢀCAL CHARACTERꢀSTꢀCS
(V = (V
+ 500mV) or V = 2.5V, whichever is greater; SHDN = IN, T = -40°C to +85°C, unless otherwise noted. Typical values
IN
OUT
IN
A
are at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDꢀTꢀONS
MꢀN
2.5
2.0
-1
TYP
MAX
5.5
UNꢀTS
Input Voltage
V
V
V
IN
Input Undervoltage Lockout
V
Rising, 75mV hysteresis
2.15
2.3
UVLO
I
I
I
= 100mA, T = +25°C, V
≥ 2V
+1
OUT
OUT
OUT
A
OUT
OUT
= 100mA, T = +25°C, V
< 2V
-1.5
-2.5
+1.5
+2.5
A
Output Voltage Accuracy
(Preset Mode)
V
= 100mA, T = -40°C to +85°C
%
OUT
A
I
T
= 1mA to 500mA, V > V
IN
= -40°C to +85°C
+ 0.5V,
OUT
OUT
-3
+3
A
Adjustable Output
Voltage Range
1.25
5.00
V
V
V
= 2.7V,
IN
T
T
= 0°C to +85°C
1.225
1.213
1.250
1.275
1.288
A
SET Voltage Threshold
(Adjustable Mode)
V
I
= 100mA,
set to 2V
SET
OUT
= -40°C to +85°C
A
V
OUT
Guaranteed Output Current
(RMS)
I
V
≥ 2.7V
IN
500
mA
OUT
Short-Circuit Current Limit
In-Regulation Current Limit
SET Dual Mode™ Threshold
SET Input Bias Current
I
V
V
= 0, V ≥ 2.7V
0.55
1.39
2
2.50
A
A
LIM
OUT
OUT
IN
> 96% of nominal value, V ≥ 2.7V
IN
50
100
150
+100
250
mV
nA
I
V
= 1.25V
= 100µA
= 500mA
-100
SET
SET
OUT
OUT
I
I
125
150
125
133
165
Ground-Pin Current
Dropout Voltage (Note 3)
Line Regulation
I
µA
mV
%/V
Q
V
V
V
= 5V
220
232
280
OUT
OUT
OUT
V
- V
I
= 500mA
= 3.3V
= 2.5V
IN
OUT
OUT
V
from (V
+ 100mV) to 5.5V,
IN
OUT
∆V
-0.15
0
+0.15
LNR
I
= 5mA
LOAD
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2
_______________________________________________________________________________________
500mA Low-Dropout Linear Regulator in UCSP
ELECTRꢀCAL CHARACTERꢀSTꢀCS (ꢃontꢁnued)
(V = (V
+ 500mV) or V = 2.5V, whichever is greater; SHDN = IN, T = -40°C to +85°C, unless otherwise noted. Typical values
IN
OUT
IN
A
are at T = +25°C.) (Note 2)
A
PARAMETER
Load Regulation
SYMBOL
CONDꢀTꢀONS
MꢀN
TYP
0.4
MAX
UNꢀTS
∆V
I
= 1mA to 500mA
1.0
%
LDR
OUT
Output Voltage Noise
SHUTDOWN
10Hz to 1MHz, C
= 3.3µF (ESR < 0.1Ω)
115
µV
RMS
OUT
SHDN = GND, V = 5.5V
Shutdown Supply Current
I
0.1
15
µA
V
IN
OFF
V
2.5V < V < 5.5V
1.6
IH
IN
SHDN Input Threshold
V
2.5V < V < 5.5V
0.6
70
IL
IN
SHDN = IN or GND, T = +25°C
1
5
A
SHDN Input Bias Current
I
nA
SHDN
T
A
= +85°C
POK OUTPUT
POK Output Low Voltage
V
POK sinking 1mA
0.01
0.1
5.5
30
V
V
OL
Operating Voltage Range for
Valid POK
POK sinking 100µA
1.0
90
POK = 5.5V, T = +25°C
1
5
POK Output High
Leakage Current
A
nA
%
T
A
= +85°C
POK Threshold
Rising edge, referred to V
93
96
OUT(NOMINAL)
THERMAL PROTECTꢀON
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
T
170
20
°C
°C
SHDN
∆T
SHDN
Note 2: All devices are 100% production tested at T = +25°C and up to 100mA. Limits over the operating temperature range and
A
above 100mA are guaranteed by design.
Note 3: The dropout voltage is defined as V - V
, when V
is 100mV below the value of V measured for V = V
OUT IN OUT(NOM)
IN
OUT
OUT
+ 500mV. Since the minimum input voltage is 2.5V, this specification is only meaningful when V
> 2.5V. For
OUT(NOM)
✕
V
between 2.5V and 3.5V, use the following equations: Typical Dropout = -40mV/V
V
+ 265mV;
OUT(NOM)
OUT(NOM)
✕
Guaranteed Maximum Dropout = -60mV/V
Maximum Dropout = 220mV.
V
+ 430mV. For V
> 3.5V, Typical Dropout = 125mV;
OUT(NOM)
OUT(NOM)
Typical Operating Characteristics
(V = (V
IN
+ 500mV) or 2.5V, whichever is greater; SHDN = IN, C = 3.3µF, C
= 3.3µF, T = +25°C, unless otherwise noted.)
OUT
IN
OUT
A
GROUND-PIN CURRENT
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
vs. LOAD CURRENT
GROUND-PIN CURRENT
vs. TEMPERATURE
250
225
200
175
150
125
100
75
180
I
= 150mA
OUT
I
= 150mA
LOAD
3.3V OUTPUT
175
165
155
145
135
125
115
3.3V OUTPUT
170
160
150
140
130
2.5V OUTPUT
5V OUTPUT
2.5V OUTPUT
1.8V OUTPUT
1.8V OUTPUT
50
1.5V OUTPUT
25
0
0
6.0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
LOAD CURRENT (A)
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
3
500mA Low-Dropout Linear Regulator in UCSP
Typical Operating Characteristics (continued)
(V = (V
IN
+ 500mV) or 2.5V, whichever is greater; SHDN = IN, C = 3.3µF, C
= 3.3µF, T = +25°C, unless otherwise noted)
OUT
IN
OUT
A
DROPOUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE ACCURACY
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENT
vs. TEMPERATURE
0.5
260
240
220
200
180
160
1.0
0.8
0.6
V
= 3.3V
OUT
0.4
0.3
I
= 150mA
LOAD
T
A
= +85°C
0.2
0.4
0.2
0.1
140
T
= +25°C
A
0
0
-0.2
-0.4
-0.6
-0.8
-1.0
V
OUT
= 1.8V
-0.1
-0.2
-0.3
-0.4
-0.5
100
80
T
A
= -40°C
V
OUT
= 3.3V
60
40
20
0
0
V
OUT
= 0.5V
-40
-15
10
35
60
85
800
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
LOAD CURRENT (A)
700
100 200
400 500 600
300
LOAD CURRENT (A)
TEMPERATURE (°C)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
LINE TRANSIENT
LOAD TRANSIENT RESPONSE
MAX1819 toc08
MAX1819 toc09
80
70
60
50
V
= 2.5V
= 5mA
OUT
OUT
V
V
= 3.8V
OUT
IN
I
= 3.3V
C
OUT
= 3.3µF
V
OUT
I
380mA
50mA
10mV/div
OUT
V
OUT
= 3.3V
R
LOAD
= 100Ω
40
30
3.5V
3V
V
IN
20
10
V
OUT
20mV/div
0
100µs/div
40µs/div
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
LOAD TRANSIENT RESPONSE
NEAR DROPOUT
POWER-ON RESET
MAX1819 toc10
MAX1819 toc11
V
V
V
V
= 3.35V
OUT
POK
IN
= 3.5V
50mV/div
0
V
OUT
OUT
2V/div
I
OUT
200mA
20mA
0
0
V
IN
40µs/div
10ms/div
4
_______________________________________________________________________________________
500mA Low-Dropout Linear Regulator in UCSP
Typical Operating Characteristics (continued)
(V = (V
IN
+ 500mV) or 2.5V, whichever is greater; SHDN = IN, C = 3.3µF, C
= 3.3µF, T = +25°C, unless otherwise noted)
OUT
IN
OUT
A
SHORT-CIRCUIT CURRENT LIMIT
vs. SUPPLY VOLTAGE
SHUTDOWN WAVEFORM
MAX1819 toc12
1.40
V
= 2V
OUT(NOM)
1.39
1.38
1.37
1.36
1.35
SHUTDOWN
VOLTAGE
0
0
2V/div
V
OUT
P
OK
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
200µs/div
SUPPLY VOLTAGE (V)
Pin Description
PꢀN
NAME
FUNCTꢀON
Regulator Input. Supply voltage can range from 2.5V to 5.5V. Bypass with a 1µF capacitor to GND (see the
Capacitor Selection and Regulator Stability section).
A1
IN
Open-Drain POK Output. POK remains low while the output voltage (V
Connect a 100kΩ pullup resistor from POK to OUT to obtain an output voltage.
) is below the POK threshold.
OUT
A2
A3
C1
POK
SHDN
OUT
Active-Low Shutdown Input. A logic low reduces supply current below 15µA. In shutdown, the POK and
OUT are low. Connect to IN for normal operation.
Regulator Output. Sources up to 500mA. Bypass with a 3.3µF low-ESR capacitor to GND. Use a 4.7µF
capacitor for output voltages below 2V.
Voltage-Setting Input. Connect to GND for preset output. Connect to a resistive voltage-divider between
OUT and GND to set the output voltage between 1.25V and 5V.
C2
C3
SET
GND
Ground
gate is pulled lower, which allows more current to pass
to the output and increases the output voltage. If the
Detailed Description
The MAX1819 is a low-dropout, low-quiescent-current
linear regulator designed primarily for battery-powered
applications. The device supplies loads up to 500mA
and is available with preset output voltages. As illustrat-
ed in Figure 1, the MAX1819 consists of a 1.25V refer-
ence, error amplifier, P-channel pass transistor, and
internal feedback voltage-divider.
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-divider connected to OUT or an external
resistor network connected to SET. The Dual Mode
comparator examines V
and selects the feedback
SET
path. If V
is below 50mV, the internal feedback path
SET
The 1.25V reference is connected to the error amplifier,
which compares this reference with the feedback volt-
age and amplifies the difference. If the feedback voltage
is lower than the reference voltage, the pass-transistor
is used and the output is regulated to the factory-preset
voltage.
_______________________________________________________________________________________
5
500mA Low-Dropout Linear Regulator in UCSP
V
IN
= 2.5V TO 5.5V
IN
C
IN
1µF
THERMAL
SENSOR
MOSFET
DRIVER WITH
I
LIM
V
OUT
= 1.25V TO 5V
OUT
ON
SHDN
C
OUT
3.3µF
5kΩ
OFF
SHUTDOWN
LOGIC
V
REF
1.25V
ERROR
AMPLIFIER
R1
LOGIC SUPPLY
VOLTAGE (V
)
OUT
R
POK
100kΩ
MAX1819
POK
TO
µC
SET
R2
93% V
100mV
REF
GND
Figure 1. Functional Diagram
Additional blocks include an output current limiter, ther-
mal sensor, and shutdown logic.
(see the Selector Guide). For example, the
MAX1819EBL33 has a preset 3.3V output voltage.
The output voltage may also be adjusted by connecting
a voltage-divider from OUT to SET to GND (Figure 2).
Select R2 in the 25kΩ to 100kΩ range. Calculate R1
with the following equation:
Internal P-Channel Pass Transistor
The MAX1819 features a 0.25Ω P-channel MOSFET
pass transistor. Unlike similar designs using PNP pass
transistors, P-channel MOSFETs require no base drive,
which reduces quiescent 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 MAX1819 does not suf-
fer from these problems and consumes only 125µA of
quiescent current under heavy loads as well as in
dropout.
R1 = R2 [(V
/ V ) - 1]
SET
OUT
where V
to 5V.
= 1.25V, and V
may range from 1.25V
SET
OUT
Shutdown
Pull SHDN low to enter shutdown. During shutdown, the
output is disconnected from the input and supply cur-
rent drops to 0.1µA. When in shutdown, POK and OUT
pull low. SHDN can be pulled as high as 6V, regardless
of the input and output voltage.
Output Voltage Selection
The MAX1819’s Dual Mode allows operation in either a
preset voltage mode or an adjustable mode. Connect
SET to GND to select the preset output voltage. The
two-digit part number suffix identifies the output voltage
6
_______________________________________________________________________________________
500mA Low-Dropout Linear Regulator in UCSP
V
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
(POWER DISSIPATION LIMIT)
OUT
R1 = R2
- 1
1.25V
V
= 2.5V TO 5.5V
IN
V
OUT
600
400
200
0
IN
OUT
T
T
= +85°C
= +70°C
MAXIMUM RECOMMENDED
OUTPUT CURRENT
A
A
C
C
OUT
3.3µF
IN
1µF
R
1
MAX1819
ON
SHDN
POK
SET
V
OUT
= 1.8V
OFF
V
OUT
= 2.5V
V
OUT
= 3.3V
R
2
GND
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
INPUT VOLTAGE (V)
Figure 3. Power Operating Regions—Maximum Output vs.
Supply Voltage
Figure 2. Adjustable Output Using External Feedback
Resistors
Operating Region and Power Dissipation
The MAX1819’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
POK Output
The power-OK (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
impedance. POK is an open-drain N-channel output. To
obtain a voltage signal, connect a pullup resistor from
POK to OUT. A 100kΩ resistor works well for most appli-
cations. POK can be used as a power-OK signal to a
microcontroller (µC), or drive an external LED to indicate
power failure. When the MAX1819 is shut down, POK is
held low independent of the output voltage. If unused,
leave POK grounded or unconnected.
power dissipated in the device is P = I
× (V
-
IN
OUT
V
). The maximum allowed power dissipation is
OUT
840mW at T = +70°C or:
A
P
MAX
= (T
- T ) / ( θ + θ
)
BA
J(MAX)
A
JB
where T - T is the temperature difference between
J
A
the MAX1819 die junction and the surrounding air, θ
JB
is the thermal resistance of the junction to the base,
and θ is the thermal resistance through the PC
Current Limit
The MAX1819 monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 1.0A
(typ). This current limit doubles when the output voltage
is within 4% of the nominal value to improve perfor-
mance with large load transients.
BA
board, copper traces, and other materials to the sur-
rounding air. For best heatsinking, the copper area
should be equally shared between the IN, OUT, and
GND pins.
The MAX1819 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 voltages are low, as shown in Figure 3.
Thermal Overload Protection
Thermal overload protection limits total power dissipa-
tion in the MAX1819. When the junction temperature
exceeds T = +170°C, a thermal sensor turns off the
J
pass transistor, allowing the IC 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 MAX1819 in
the event of fault conditions. For continuous operation,
do not exceed the absolute maximum junction-temper-
ature rating of T = +150°C.
J
_______________________________________________________________________________________
7
500mA Low-Dropout Linear Regulator in UCSP
The MAX1819 load-transient response (see the Typical
Applications Information
Operating Characteristics) shows two components of
Capacitor Selection and
Regulator Stability
the output response: a DC shift from the output imped-
ance due to the load current change, and the transient
response. Increasing the output capacitor’s value and
decreasing the ESR attenuates the overshoot.
Capacitors are required at the MAX1819’s input and
output for stable operation over the full temperature
range and with load currents up to 500mA. Connect a
1µF capacitor between IN and ground and a 3.3µF low-
ESR capacitor between OUT and ground. For output
voltages less than 2V, use a 4.7µF low-ESR output
Input-Output (Dropout) Voltage
A regulator’s minimum input-to-output voltage differential
(dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines the
useful end-of-life battery voltage. Because the MAX1819
uses a P-channel MOSFET pass transistor, its dropout
voltage is a function of drain-to-source on-resistance
capacitor. The input capacitor (C ) lowers the source
IN
impedance of the input supply. Reduce noise and
improve load-transient response, stability, and power-
supply rejection by using larger output capacitors, such
as 10µF.
(R
) multiplied by the load current (see the Typical
DS(ON)
Operating Characteristics).
The output capacitor’s (C
) equivalent series resis-
OUT
tance (ESR) affects stability and output noise. Use out-
put capacitors with an ESR of 0.1Ω or less to ensure
stability and optimum transient response. Surface-
mount ceramic capacitors have very low ESR and are
V
= V - V
= R
× I
DROPOUT
IN
OUT
DS(ON) OUT
The MAX1819 ground current remains at approximately
150µA in dropout.
commonly available in values up to 10µF. C and
IN
Chip Information
C
OUT
use short traces to connect to the MAX1819.
TRANSISTOR COUNT: 845
Noise, PSRR, and Transient Response
The MAX1819 is designed to operate with low dropout
voltages and low quiescent currents in battery-powered
systems while still maintaining good noise, transient
response, and AC rejection. See the Typical Operating
Characteristics for a plot of Power-Supply Rejection
Ratio (PSRR) vs. Frequency. 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.
8
_______________________________________________________________________________________
500mA Low-Dropout Linear Regulator in UCSP
Package Information
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