MAX6472TA15AD4 [MAXIM]
300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit ; 300毫安LDO线性稳压器，内置微处理器复位电路\n
| 型号： | MAX6472TA15AD4 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit
|
| 文件： | 总20页 (文件大小：563K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2532; Rev 1; 10/02
300mA LDO Linear Regulators with
Internal Microprocessor Reset Circuit
General Description
Features
o 3 ✕ 3 UCSP, 6-Pin SOT23, and 8-Pin QFN Packages
o Preset +1.5V to +3.3V Output (100mV Increments)
o SET Pin for Adjustable Output Voltage
The MAX6469–MAX6484 are low-dropout linear regula-
tors with a fully integrated microprocessor reset circuit.
Each is available with preset output voltages from +1.5V
to +3.3V in 100mV increments and delivers up to 300mA
of load current. These devices consume only 82µA of
supply current. The low supply current, low dropout volt-
age, and integrated reset functionality make these
devices ideal for battery-powered portable equipment.
o 75µV
LDO Output Voltage Noise
RMS
(MAX6477–MAX6484)
o
2.0ꢀ Accuracꢁ Oꢂer Temperature
o Guaranteed 300mA Output Current
The MAX6469–MAX6484 include a reset output that indi-
cates when the regulator output drops below standard
microprocessor supply tolerances (-7.5% or -12.5% of
nominal output voltage). This eliminates the need for an
external microprocessor supervisor, while ensuring that
supply voltages and clock oscillators have stabilized
before processor activity is enabled. Push-pull and open-
drain active-low reset outputs are available, with reset
timeout periods of 2.5ms, 20ms, 150ms, or 1200ms (min).
o Low Dropout Voltage
55mV at 150mA
114mV at 300mA
o 82µA Supplꢁ Current, 0.1µA Shutdown Current
o Input Reꢂerse Current, Thermal and Short-Circuit
Protection
o Microprocessor Reset with Four Timeout Options
o Push-Pull or Open-Drain RESET
o Manual Reset Input
The MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–
MAX6484 also have a shutdown feature that reduces the
supply current to 0.1µA (typ). The MAX6471–MAX6474/
MAX6479–MAX6482 offer a manual reset input to assert a
microprocessor reset while the regulator output is within
specification. The MAX6475/MAX6476/MAX6483/
MAX6484 feature a remote feedback sense pin for use
with an external NPN transistor for higher-current applica-
tions. The MAX6469–MAX6476 are available in 6-pin
SOT23 and 8-pin thin QFN packages. The MAX6477–
MAX6484 are available in a 3 × 3 chip-scale package
(UCSP™). All devices are specified for operation from
-40°C to +85°C.
o Remote Feedback Sense
Ordering Information
PIN-
PACKAGE
PART
TEMP RANGE
MAX6469UT_ _ _D_-T
MAX6469TA_ _ _D_*
MAX6470UT_ _ _D_-T
MAX6470TA_ _ _D_*
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
6 SOT23-6
8 Thin QFN
6 SOT23-6
8 Thin QFN
*Future product—contact factory for availability.
Applications
Hand-Held Instruments (PDAs, Palmtops)
PCMCIA Cards/USB Devices
Cellular/Cordless Telephones
CD/DVD Drives
Note: The first “_ _ are placeholders for the output voltage levels
”
of the devices. Desired output voltages are set by the suffix found
in the Output Voltage Suffix Guide (Table 1). The third “_” is a
placeholder for the reset threshold accuracy. Desired reset
threshold accuracy is set by the suffix found in the Reset
Threshold Accuracy Guide (Table 2). The “_” following the D is a
placeholder for the reset timeout delay time. Desired reset timeout
delay time is set by the suffix found in the Reset Timeout Delay
Guide (Table 3). For example, the MAX6481BL30BD4-T has a
3.0V output voltage, 12.5% reset threshold tolerance, and a
1200ms (min) reset timeout delay. Sample stock is generally avail-
able on standard versions only (Table 4). Standard versions
require a minimum order increment of 2.5k units. Nonstandard
versions must be ordered in 10k-unit increments. Contact factory
for availability.
Notebook Computers
Digital Cameras
Bluetooth Modules/Wireless LAN
UCSP is a trademark of Maxim Integrated Products, Inc.
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
________________________________________________________________ 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.
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
Continuous Power Dissipation (T = +70°C)
A
IN, SHDN, OUT, FB ..................................................-0.3V to +7V
3 x 3 UCSP (derate 10.5mW/°C above +70°C) ............840mW
6-Pin SOT23 (derate 9.1mW/°C above +70°C).............727mW
8-Lead Thin QFN
MR, SET.......................................................-0.3V to (V + 0.3V)
IN
OUT
RESET (push-pull) ...................................-0.3V to (V
+ 0.3V)
RESET (open drain)..................................................-0.3V to +7V
OUT Short Circuit .......................................................Continuous
Input/Output Current (all pins except IN and OUT)............20mA
(derate 24.4mW/°C above +70°C)..............................1951mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: The MAX6477–MAX6484 are constructed using a unique set of packaging techniques that impose a limit on the thermal pro-
file the devices can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder
profiles recommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and
Convection reflow. Pre-heating is required. Hand or wave soldering is not allowed.
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) or +2.5V, whichever is greater, C
= 3.3µF, T = -40°C to +85°C. Typical specifications are at T = +25°C,
IN
OUT
OUT
A
A
unless otherwise noted.) (Note 2)
PARAMETER
Input Voltage Range
SYMBOL
CONDITIONS
MIN
2.5
TYP
MAX
5.5
UNITS
V
V
V
IN
Input Undervoltage Lockout
V
V
falling
2.25
2.47
136
UVLO
IN
I
I
= 0
= 300mA
= +25°C
82
96
OUT
OUT
Supply Current (Ground Current)
I
µA
µA
Q
Shutdown Supply Current
REGULATOR CIRCUIT
Output Current
I
T
0.1
1
SHDN
A
300
-1.3
-2.3
mA
%
1mA ≤ I
1mA ≤ I
1mA ≤ I
2mA ≤ I
2mA ≤ I
1mA ≤ I
≤ 150mA, T = +25°C
+1.3
+2.3
+2.7
+1.1
+2.0
OUT
OUT
A
Output Voltage Accuracy (Fixed
Output Voltage Operation,
Table 1) MAX6469–MAX6476
≤ 150mA, T = -40°C to +85°C
A
≤ 300mA, T = -40°C to +85°C
-2.7
-1.1
-2.0
-2.7
OUT
OUT
OUT
OUT
A
≤ 100mA, T = +25°C
A
Output Voltage Accuracy (Fixed
Output Voltage Operation,
Table 1) MAX6477–MAX6484
≤ 100mA, T = -40°C to +85°C
%
A
≤ 300mA, T = -40°C to +85°C
+2.7
5.0
A
Adjustable Output Voltage Range
SET Reference Voltage
SET Dual ModeTM Threshold
SET Input Leakage Current
V
V
V
mV
nA
SET
V
1.200
1.229
185
20
1.258
SET
I
V
= 0, +1.2V (Note 3)
100
SET
SET
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2
_______________________________________________________________________________________
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
ELECTRICAL CHARACTERISTICS (continued)
(V = (V
IN
+ 0.5V) or +2.5V, whichever is greater, C
= 3.3µF, T = -40°C to +85°C. Typical specifications are at T = +25°C,
OUT
OUT
A
A
unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
23
55
MAX
32
90
UNITS
I
I
I
I
I
I
I
I
I
I
I
I
= 50mA
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
V
= +3.3V
OUT
= 150mA
= 300mA
= 50mA
= 150mA
= 300mA
= 50mA
= 150mA
= 300mA
= 50mA
= 150mA
= 300mA
(fixed output operation)
114
25
61
180
40
100
190
50
110
210
60
150
250
V
= +3.0V
OUT
(fixed output operation)
114
26
65
Dropout Voltage
(Notes 3, 4)
∆V
mV
DO
V
= +2.8V
OUT
(fixed output operation)
137
30
75
V
= +2.5V
OUT
(fixed output operation)
158
Output Current Limit
V
V
≥ 2.5V (Note 3)
450
mA
µA
IN
IN
Input Reverse Leakage Current
(OUT to IN Leakage Current)
= 4V, V
= 5.5V, SHDN deasserted
0.01
20
1.5
OUT
Rising edge of V or SHDN to V
within specification, R = 68Ω, SET = GND,
IN
OUT
Startup Time Response
µs
L
I
= 10mA
OUT
SHDN Input Low Voltage
SHDN Input High Voltage
SHDN Input Current
V
0.3 × V
V
IL
IN
V
0.7 × V
V
IH
IN
SHDN = V or GND
-1
0.1
180
20
+1
µA
°C
°C
IN
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
T
SHDN
∆T
SHDN
V
= 1.5V, 2.5V ≤ V ≤ 5.5V,
= 10mA
OUT
IN
Line Regulation
Load Regulation
0.09
0.2
%/V
%
I
OUT
V
= 1.5V, V = 2.5V, 1mA ≤ I
≤
OUT
OUT
IN
150mA
10Hz to 100kHz,
MAX6469–MAX6476
MAX6477–MAX6484
150
75
C
= 0.1µF,
IN
Output Voltage Noise
µV
RMS
I
V
= 100mA,
= 1.5V
OUT
OUT
RESET CIRCUIT
V
Reset Threshold
OUT
MAX64_ _ _ _ _ _ A
MAX64_ _ _ _ _ _ B
90
85
92.5
87.5
95
90
(V for MAX6475/MAX6476/
FB
MAX6483/MAX6484) (Note 5)
V
%V
OUT
THOUT
V
to Reset Delay
OUT
(V for MAX6475/MAX6476/
FB
35
µs
MAX6483/MAX6484)
D1
D2
D3
D4
2.5
20
3.75
30
5.0
40
Reset Timeout Period
(Note 6)
t
ms
RP
150
1200
225
1800
300
2400
_______________________________________________________________________________________
3
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
ELECTRICAL CHARACTERISTICS (continued)
(V = (V
IN
+ 0.5V) or +2.5V, whichever is greater, C
= 3.3µF, T = -40°C to +85°C. Typical specifications are at T = +25°C,
OUT
OUT
A
A
unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
0.3 ×
MR Input Low Voltage
MR Input High Voltage
V
V
IL
V
OUT
0.7 ×
V
(Note 3)
V
IH
V
OUT
MR Minimum Input Pulse
MR Glitch Rejection
MR to Reset Delay
1
µs
ns
ns
kΩ
120
200
40
MR Pullup Resistance
MR to OUT
25
70
V
V
≥ 1.0V, I
= 50µA, RESET asserted
0.3
0.4
RESET Output Voltage
(Open Drain)
OUT
OUT
SINK
V
V
OL
≥ 1.5V, I
= 3.2mA, RES ET asserted
SINK
Open-Drain Reset Output
Leakage Current
(Note 3)
I
1
µA
LKG
V
V
≥ 1.0V, I
= 50µA, RESET asserted
= 3.2mA, RES ET asserted
0.3
0.4
OUT
OUT
SINK
V
OL
≥ 1.5V, I
SINK
RESET Output Voltage Push-Pull
V
V
≥ 2.0V, I
= 500µA, RESET
SOURCE
0.8 ×
OUT
V
OH
deasserted
V
OUT
Note 2: All devices are 100% production tested at +25°C and are guaranteed by correlation for T = T
to T
.
MAX
A
MIN
Note 3: Guaranteed by design.
Note 4: Dropout voltage is defined as (V - V
) when V
is 2% below the value of V
for V = V
+ 1V.
IN
OUT
OUT
OUT
IN
OUT(NOM)
Note 5: MAX6473/MAX6474/MAX6481/MAX6482 are guaranteed by design for V
< 2.5V.
OUT
Note 6: Select the reset timeout period using the Reset Timeout Delay Guide (Table 3). Insert the appropriate suffix in the part number
when ordering.
Typical Operating Characteristics
(V = 5V, V
IN
= 3.3V, C = 3.3µF, T = +25°C, unless otherwise noted.)
OUT A
OUT
GROUND CURRENT vs. INPUT VOLTAGE
(NO LOAD)
GROUND CURRENT vs. INPUT VOLTAGE
(300mA LOAD)
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
120
100
80
60
40
20
0
120
100
80
60
40
20
0
150
125
100
75
+85°C
+25°C
RESET ASSERTS ABOVE
THIS LINE
+85°C
-40°C
+25°C
-40°C
50
25
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
1
10
100
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
RESET THRESHOLD OVERDRIVE (mV)
4
_______________________________________________________________________________________
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Typical Operating Characteristics (continued)
(V = 5V, V
IN
= 3.3V, C
= 3.3µF, T = +25°C, unless otherwise noted.)
OUT
OUT A
REGION OF STABLE C
ESR
OUT
DROPOUT VOLTAGE vs. LOAD CURRENT
PSRR vs. FREQUENCY
vs. LOAD CURRENT
0
-10
-20
-30
-40
-50
-60
5
4
3
2
1
0
125
100
75
50
25
0
V
= 3.3V
OUT
V
= 3.3V
OUT
C
= 3.3µF
OUT
C
= 3.3µF
OUT
I
= 30mA
LOAD
C
= 4.7µF
OUT
C
= 3.3µF
OUT
STABLE REGION
0.01
0.1
1
10
100
1000
0
50
100
150
200
250
300
0
50
100
150
200
250
300
FREQUENCY (kHz)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
SHUTDOWN RESPONSE
OUTPUT NOISE
OUTPUT NOISE vs. FREQUENCY
MAX6469 toc07
MAX6469 toc09
100
80
60
40
20
0
V
V
I
= 4.5V
V
= 4.5V
= 3.3V
IN
IN
OUT
= 3.3V
V
I
OUT
= 100mA
= 100mA
LOAD
LOAD
V
SHDN
5V/div
100µV/div
V
OUT
2V/div
I
= 50mA
LOAD
500µs/div
20ms/div
10
100
1000
10,000
100,000
FREQUENCY (Hz)
LOAD TRANSIENT RESPONSE
NEAR DROPOUT
STARTUP RESPONSE
LOAD TRANSIENT RESPONSE
MAX6469 toc12
MAX6469 toc10
MAX6469 toc11
V
V
= 5V
IN
= 3.3V
OUT
LOAD
V
IN
2V/div
I
= 100mA
V
OUT
5mV/div
V
OUT
20mV/div
V
OUT
2V/div
10µs/div
10µs/div
100µs/div
_______________________________________________________________________________________
5
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Typical Operating Characteristics (continued)
(V = 5V, V
IN
= 3.3V, C
= 3.3µF, T = +25°C, unless otherwise noted.)
OUT
OUT A
RESET DELAY RESPONSE
LINE TRANSIENT RESPONSE
RESET RESPONSE TO MR
MAX6469 toc14
MAX6469 toc13
MAX6469 toc15
5V
V
IN
500mV/div
4.5V
V
IN
1V TO 4V
2V/div
MR
2V/div
V
OUT
20mV/div
AC-COUPLED
RESET
2V/div
RESET
2V/div
V
LOAD
= 3.3V
= 10mA
OUT
I
200ms/div
100µs/div
200ns/div
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
RESET RESPONSE TO V RISING
IN
MAX6469 toc16
1.012
1.006
1.000
0.994
0.988
NORMALIZED TO +25°C
RESET
2V/div
I
= 10mA
LOAD
V
OUT
2V/div
I
= 300mA
LOAD
I
= 150mA
LOAD
V
IN
5V/div
-40
-15
10
35
60
85
200ms/div
TEMPERATURE (°C)
6
_______________________________________________________________________________________
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
MAX6469/MAX6470/MAX6477/MAX6478 Pin Description
PIN
BUMP
NAME
FUNCTION
MAX6469/MAX6470
MAX6477/MAX6478
SOT23
QFN
UCSP
1
1, 2
A1
IN
Regulator Input. Bypass IN to GND with a 0.1µF capacitor.
Ground. This pin also functions as a heatsink. Solder to large pads or
the circuit-board ground plane to maximize thermal dissipation.
2
3
3
4
A2
A3
GND
Active-Low Shutdown Input. Connect SHDN to V for normal
IN
SHDN
operation.
Active-Low Reset Output. RESET remains low while V
is below the
OUT
reset threshold. RESET remains low for the duration of the reset timeout
period after the reset conditions are terminated. RESET is available in
open-drain and push-pull configurations.
4
5
C3
RESET
Feedback Input for Externally Setting the Output Voltage. Connect SET
to GND to select the preset output voltage. Connect SET to an external
resistor-divider network for adjustable output operation.
5
6
6
C2
C1
SET
Regulator Output. Bypass OUT to GND with a minimum 3.3µF low-ESR
capacitor.
7, 8
OUT
MAX6471/MAX6472/MAX6479/MAX6480 Pin Description
PIN
MAX6471/MAX6472
BUMP
NAME
FUNCTION
MAX6479/MAX6480
SOT23
QFN
UCSP
1
1, 2
A1
IN
Regulator Input. Bypass IN to GND with a 0.1µF capacitor.
Ground. This pin also functions as a heatsink. Solder to large pads or
the circuit-board ground plane to maximize thermal dissipation.
2
3
3
4
A2
A3
GND
Active-Low Manual Reset Input. The reset output is asserted while MR
is pulled low and remains asserted for the duration of the reset timeout
period after MR transitions from low to high. Leave MR unconnected or
MR
connect to V
if not used. MR has an internal pullup resistor of 40kΩ
OUT
(typ) to V
.
OUT
Active-Low Reset Output. RESET remains low while V
is below the
OUT
reset threshold or while MR is held low. RESET remains low for the
4
5
C3
RESET duration of the reset timeout period after the reset conditions are
terminated. RESET is available in open-drain and push-pull
configurations.
Feedback Input for Externally Setting the Output Voltage. Connect SET
5
6
6
C2
C1
SET
to GND to select the preset output voltage. Connect SET to an external
resistor-divider network for adjustable output operation.
Regulator Output. Bypass OUT to GND with a minimum 3.3µF low-ESR
capacitor.
7, 8
OUT
_______________________________________________________________________________________
7
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
MAX6473/MAX6474/MAX6481/MAX6482 Pin Description
PIN
BUMP
NAME
FUNCTION
MAX6473/MAX6474
MAX6481/MAX6482
SOT23
QFN
UCSP
1
1, 2
A1
IN
Regulator Input. Bypass IN to GND with a 0.1µF capacitor.
Ground. This pin also functions as a heatsink. Solder to large pads or
the circuit-board ground plane to maximize thermal dissipation.
2
3
3
4
A2
A3
GND
Active-Low Shutdown Input. Connect SHDN to V for normal
IN
SHDN
operation.
Active-Low Reset Output. RESET remains low while V
is below the
OUT
reset threshold or while MR is held low. RESET remains low for the
4
5
C3
RESET duration of the reset timeout period after the reset conditions are
terminated. RESET is available in open-drain and push-pull
configurations.
Active-Low Manual Reset Input. The reset output is asserted while MR
is pulled low and remains asserted for the duration of the reset timeout
5
6
6
C2
C1
MR
period after MR transitions from low to high. Leave MR unconnected or
connect to V if not used. MR has an internal pullup resistor of 40kΩ
OUT
(typ) to V
.
OUT
Regulator Output. Bypass OUT to GND with a minimum 3.3µF (min)
low-ESR capacitor.
7, 8
OUT
MAX6475/MAX6476/MAX6483/MAX6484 Pin Description
PIN
MAX6475/MAX6476
BUMP
NAME
FUNCTION
MAX6483/MAX6484
SOT23
QFN
UCSP
1
1, 2
A1
IN
Regulator Input. Bypass IN to GND with a 0.1µF capacitor.
Ground. This pin also functions as a heatsink. Solder to large pads or
the circuit-board ground plane to maximize thermal dissipation.
2
3
3
4
A2
A3
GND
Active-Low Shutdown Input. Connect SHDN to V for normal
IN
SHDN
operation.
Active-Low Reset Output. RESET remains low while FB is below the
reset threshold. RESET remains low for the duration of the reset
timeout period after the reset conditions are terminated. RESET is
available in open-drain and push-pull configurations.
4
5
C3
RESET
Feedback Input for Linear Regulator Controller or Remote Sense
5
6
6
C2
C1
FB
Applications. Connect FB to the external load (V ) to obtain the fixed
CC
output voltage.
Regulator Output. Bypass OUT to GND with a minimum 3.3µF low-ESR
capacitor.
7, 8
OUT
8
_______________________________________________________________________________________
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Detailed Description
The MAX6469–MAX6484 are ultra-low, quiescent cur-
2.5V TO 5.5V
IN
rent, low-dropout linear regulators with an integrated
microprocessor reset circuit. These devices guarantee
300mA (min) drive capabilities and are available with
preset output voltages in 100mV increments between
+1.5V and +3.3V. The internal reset circuit monitors the
regulator output voltage and asserts the reset output
when the regulator output is below the microprocessor
supply tolerance.
OUT
MAX6469–MAX6472
MAX6477–MAX6480
R1
R2
(MR)
SET
C
OUT
MANUAL
RESET
GND
Regulator
The regulator core operates with +2.5V to +5.5V input
voltage range. The output voltage is offered in 100mV
increments between +1.5V and +3.3V (contact factory
for other output voltage options). The MAX6469–
MAX6472/MAX6477–MAX6480 offer an adjustable out-
put voltage implemented with an external resistor-
divider network between OUT, SET, and GND (Figure
1). SET must be connected to either GND for fixed
( ) ARE FOR MAX6471/MAX6472/MAX6479/MAX6480 ONLY
Figure 1. Adjustable Output Voltage Configuration
the reset threshold. RESET asserts when MR is pulled
low (MAX6471–MAX6474/MAX6479–MAX6482). RESET
asserts when SHDN is pulled low (MAX6469/
MAX6470/MAX6473–MAX6478/MAX6481–MAX6484).
V
or to an external divider for adjustable V
. The
OUT
OUT
Shutdown
(MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–
MAX6484 only)
MAX6469–MAX6472/MAX6477–MAX6480 automatically
determine the feedback path depending on the con-
nection of SET. The Typical Operating Circuit shows a
typical connection for the MAX6469. OUT is an internal-
ly regulated low-dropout (LDO) linear regulator that
powers a microprocessor.
SHDN allows the regulator to shut down, thereby reduc-
ing the total I consumption of the device. SHDN pro-
IN
vides a digitally controlled active-low shutdown. In
shutdown mode, the pass transistor, control circuit, and
reference turn off to reduce the supply current to below
0.1µA. Connect SHDN to IN for normal operation.
Reset Circuit
The reset supervisor circuit is fully integrated in the
MAX6469–MAX6484 and uses the same reference volt-
age as the regulator. Two supply tolerance reset
thresholds, -7.5% and -12.5%, are provided for each
type of device.
Manual Reset Input
(MAX6471–MAX6474/MAX6479–MAX6482 only)
Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset while the regulator output voltage is still
within tolerance.
-7.5% Reset: Reset does not assert until the regulator
output voltage is at least -5% out of tolerance and
always asserts before the regulator output voltage is
-10% out of tolerance.
Reset remains asserted while MR is low and for the
-12.5% Reset: Reset does not assert until the regulator
output voltage is at least -10% out of tolerance and
always asserts before the regulator output voltage is
-15% out of tolerance.
reset timeout period (t ) after MR returns high. The
RP
MR input has an internal pullup of 40kΩ (typ) to OUT.
MR can be driven with TTL/CMOS logic levels or with
open-drain/collector outputs. Connect a normally open
switch from MR to GND to create a manual reset func-
tion; external debounce circuitry is not required. If MR
is driven from long cables or the device is used in a
noisy environment, connect a 0.1µF capacitor from MR
to GND to provide additional noise immunity.
RESET Output
A µP’s reset input starts the µP in a known state. The
MAX6469–MAX6484 µP supervisory circuits assert
RESET during power-up, power-down, and brownout
conditions. RESET asserts when the input voltage is
below the undervoltage lockout threshold. RESET
Feedback Input
(MAX6475/MAX6476/MAX6483/MAX6484 only)
asserts when V
is below the reset threshold and
OUT
remains asserted for at least the minimum selected reset
timeout period (t , Table 3) after V rises above the
The feedback input (FB) connects to an internal resistor-
divider network (Functional Diagram). FB is not internally
RP
IN
OUT
undervoltage lockout threshold and V
rises above
connected to V
, and as a result can be used to
OUT
_______________________________________________________________________________________
9
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
remotely sense the output voltage of the device. Using
FB with an external NPN transistor, the current drive
capability can be increased according to the following
equation (Figure 2):
OUT-to-GND current through the LDO is 40µA (typ). The
regulator output can be held up with an external super
capacitor or backup battery at OUT until the IN battery is
replaced. The RESET output is asserted while the IN bat-
tery is removed to place the system in a low-power
mode. Volatile memory content is maintained until the
super capacitor or battery voltage drops below RAM
standby specifications. RESET deasserts when the IN
battery has been replaced and OUT exceeds the
desired reset threshold. For nonrechargeable backup
battery applications, place a reverse diode between
OUT and the backup battery (to prevent battery charg-
ing). The external diode does not affect the regulator’s
dropout voltage because it is not between the LDO out-
put and the processor/memory Vcc supply. The diode
can be replaced with a current-limiting resistor for
rechargeable backup battery applications.
I
= I
✕ (β+1)
OUT(TOTAL)
OUT
The external NPN pass transistor must meet specifica-
tions for current gain, power dissipation, and collector
current. The beta influences the maximum output cur-
rent the circuit can deliver. The largest guaranteed out-
put current is given by I
(max) = 300mA × beta
LOAD
(min). The transistor’s rated power dissipation must
exceed the actual power dissipated in the transistor.
The power dissipated (PD) equals the maximum load
current (I
(max)) times the maximum input-to-out-
LOAD
put voltage differential: PD = I
(max) × (V (max) -
IN
LOAD
V
). The rated transistor collector current must
OUT
exceed the maximum load current.
Current Limit
Reverse Leakage Protection
The MAX6469–MAX6484 include an internal current-
limit circuit that monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 450mA
(min). The output can be shorted to ground indefinitely
without damaging the part.
Reverse OUT to IN Current
An internal circuit monitors the MAX6469–MAX6484
input and output voltages. When the output voltage is
greater than the input voltage, the internal IN-to-OUT
pass transistor and parasitic diode turn off. An external
voltage applied to OUT does not reverse charge a bat-
tery or power source applied to IN (the leakage path
from OUT to IN is 0.01µA typ). When the output voltage
exceeds the input voltage, OUT powers the device and
Thermal Shutdown
When the junction temperature (T ) exceeds +180°C
J
(typ), the thermal sensor signals the shutdown logic,
turning off the pass transistor and allowing the IC to
shutdown must be logic high (greater than 0.7 ✕ V
).
OUT
RESET asserts until IN exceeds OUT and OUT is above
the specified V threshold (based on the selected
REMOVABLE
LITHIUM ION OR
3-CELL
THOUT
or adjusted regulator OUT nominal voltage).
ALKALINE
IN
OUT
Reverse OUT to Ground Current
The MAX6469–MAX6484 maintain a low OUT-to-GND
reverse-current flow when the IN power source is
removed. When IN floats (input battery removed) and
MAX6469–
MAX6484
3.3µF
3.0V
LITHIUM
µP
MEMORY
SHDN
SHDN is pulled up to V
(by an external diode), the
OUT
5.0V
REMOVABLE
LITHIUM ION OR
3-CELL
OUT
ALKALINE
1A TOTAL CURRENT
V
CC
= 3.3V
IN
IN
OUT
MAX6469–
MAX6484
330Ω
3.3µF
0.1µF
R
3.3µF
MAX6475/MAX6476
MAX6483/MAX6484
PULLUP
µP
MEMORY
µP
SUPERCAP
FB
SHDN
RESET
GND
Figure 3. Battery Backup
10 ______________________________________________________________________________________
Figure 2. High-Current, External Transistor Application
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
cool. The thermal sensor turns the pass transistor on
resistor values greater than 100kΩ. In preset voltage
mode, the impedance between SET and ground should
always be less than 50kΩ. In most applications, con-
nect SET directly to ground.
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 MAX6469–MAX6484 in the
event of fault conditions. For continuous operation, do
not exceed the absolute maximum junction temperature
Low-Noise UCSP Output
MAX6477–MAX6484 UCSP products include internal fil-
tering to yield low output noise without an additional
rating of T
= +150°C.
JMAX
external bypass capacitor. The devices yield 75µV
RMS
(for
Operating Region and Power Dissipation
(typ) output noise (for V
= 3.0V) and 150µV
OUT RMS
The MAX6469–MAX6484’s maximum power dissipation
depends on the thermal resistance of the case and cir-
cuit board, the temperature difference between the die
junction and the ambient air, and the rate of airflow. The
power dissipation across the device is:
V
= 3.3V). This low-noise feature makes the
OUT
MAX6477–MAX6484 ideal for audio applications.
Capacitor Selection and Regulator
Stability
For stable operation over the full temperature range
and with load currents up to 300mA, use a 3.3µF (min)
ceramic output capacitor with an ESR <0.2Ω. To
reduce noise and improve load transient response, sta-
bility, and power-supply rejection, use large output
capacitor values such as 10µF.
P = I
(V - V
)
OUT
OUT IN
The maximum power dissipation is:
= (T - T ) / (Ø + Ø )
BA
P
MAX
J
A
JB
where T - T is the temperature difference between the
J
A
die junction and the surrounding air, Ø (or Ø ) is the
JB
JC
Note that some ceramic capacitors exhibit large capac-
itance and ESR variation with temperature. With capaci-
tor dielectrics such as Z5U and Y5V, use 4.7µF or more
to ensure stability over temperature. With X7R or X5R
capacitor dielectrics, 3.3µF should be sufficient at all
operating temperatures. Higher ESR capacitors require
more capacitance to maintain stability. A graph of the
Region of Stable ESR vs. Load Current is shown in the
Typical Operating Characteristics.
To improve power-supply rejection and transient
response, use a 1µF capacitor between IN and GND.
The MAX6469–MAX6484 remain stable with purely
resistive loads or current loads up to 300mA.
thermal resistance of the package, and Ø is the ther-
BA
mal resistance through the PC board, copper traces,
and other materials to the surrounding air. The
MAX6469–MAX6476 QFN package Ø = 41°C/W, and
the MAX6469–MAX6476 SOT package Ø = 110°C/W.
JC
JC
The MAX6469–MAX6484’s ground pin (GND) performs
the dual function of providing an electrical connection
to the system ground and channeling heat away.
Connect GND to the system ground using a large pad
or ground plane. For continuous operation, do not
exceed the absolute maximum junction temperature
rating of T
= +150°C.
JMAX
Applications Information
Output Voltage Selection
Reset Transient Immunity
The reset circuit is relatively immune to short-duration,
The MAX6469–MAX6484 feature dual-mode operation:
they operate in either a preset output voltage mode
or an adjustable mode. In preset voltage mode, internal
feedback resistors set the MAX6469–MAX6484’s output
from +1.5V to +3.3V (Table 1). Select this mode by con-
necting SET to ground (MAX6469–MAX6472/
MAX6477–MAX6480). In adjustable mode, select an
output between 1.25V and 5.5V using two external
resistors connected as a voltage-divider to SET (Figure
1). The output voltage is set by the following equation:
falling V
transients. The Typical Operating
OUT
Characteristics section shows a graph of the Maximum
Transient Duration vs. Reset Threshold Overdrive for
which reset is not asserted. The graph was produced
using falling V
transients starting at V
and end-
OUT
OUT
ing below the reset threshold by the magnitude indicat-
ed (reset threshold overdrive). The graph shows the
maximum pulse width that a falling V
transient can
OUT
typically have without triggering a reset pulse. As the
amplitude of the transient increases (i.e., goes further
below the reset threshold), the maximum allowable
V
= V
(1 + R / R )
SET 1 2
OUT
pulse width decreases. Typically, a V
transient that
OUT
where V
= 1.23V. To simplify resistor selection:
SET
goes only 10mV below the reset threshold and lasts for
75µs does not trigger a reset pulse.
R = R (V
1
/ V
- 1)
2
OUT
SET
Choose R2 = 50kΩ to maintain stability, accuracy and
high-frequency power-supply rejection. Avoid selecting
______________________________________________________________________________________ 11
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Power Dissipation Consideration
UCSP Reliability
For the SOT23 package, any pin except the SET pin
can be used as a heatsink. If the SET pin is used as a
heatsink, excessive parasitic capacitance can affect
stability. For the QFN package, the exposed metal pad
on the back side of a package connects to GND of the
chip. This metal pad can be used as a heatsink.
The chip-scale package (UCSP) represents a unique
packaging form factor that might not perform equally to
a packaged product through traditional mechanical
reliability tests. CSP reliability is integrally linked to the
user’s assembly methods, circuit-board material, and
usage environment. The user should closely review
these areas when considering a CSP package.
Performance through operating life test and moisture
resistance remains uncompromised, because it is pri-
marily determined by the wafer-fabrication process.
Mechanical stress performance is a greater considera-
tion for a CSP package. CSPs are attached through
direct solder contact to the user’s PC board, forgoing
the inherent stress relief of a packaged product’s lead
frame. Solder-joint contact integrity must be considered.
Information on Maxim’s qualification plan, test data, and
recommendations are detailed in the UCSP application
note on Maxim’s website at www.maxim-ic.com.
UCSP Consideration
For general UCSP package information and PC layout
considerations, refer to Maxim Application Note: Wafer-
Level Chip-Board-Scale Package.
UCSP Light Sensitivity
Exposing the UCSP device to direct sunlight causes
the device to operate incorrectly. Strong light sources
such as halogen lamps placed directly on the device
also affect electrical performance.
Table 1. Output Voltage Suffix Guide
Table 2. Reset Threshold Accuracy Guide
OUTPUT
VOLTAGE (V)
V
RESET
OUT
SUFFIX
SUFFIX
TOLERANCE (%)
A
B
-7.5
15
16
17
18
19
20
21
22
23
24
25
26
27
28
285
29
30
31
32
33
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.85
2.9
3.0
3.1
3.2
3.3
-12.5
Table 3. Reset Timeout Delay Guide
MINIMUM RESET
SUFFIX
TIMEOUT PERIOD (ms)
D1
D2
D3
D4
2.5
20
150
1200
Note: Factory-trimmed custom output voltages may be avail-
able; contact factory for availability.
12 ______________________________________________________________________________________
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Table 4. Standard Versions
DEVICE
MAX6471UT28BD3
MAX6471UT30AD3
MAX6471UT33BD3
MAX6472TA15AD3
MAX6472TA18BD3
MAX6472TA25AD3
MAX6472TA28BD3
MAX6472TA30AD3
MAX6472TA33BD3
MAX6472UT15AD3
MAX6472UT18BD3
MAX6472UT25AD3
MAX6472UT28BD3
MAX6472UT30AD3
MAX6472UT33BD3
MAX6473TA15AD3
MAX6473TA18BD3
MAX6473TA25AD3
MAX6473TA28BD3
MAX6473TA30AD3
MAX6473TA33BD3
MAX6473UT15AD3
MAX6473UT18BD3
MAX6473UT25AD3
MAX6473UT28BD3
MAX6473UT30AD3
MAX6473UT33BD3
MAX6474TA15AD3
MAX6474TA18BD3
MAX6474TA25AD3
TOP MARK
ABLG
ABLH
ABLI
AEF
DEVICE
MAX6469TA15BD3
MAX6469TA18AD3
MAX6469TA25BD3
MAX6469TA28AD3
MAX6469TA30BD3
MAX6469TA33AD3
MAX6469UT15BD3
MAX6469UT18AD3
MAX6469UT25BD3
MAX6469UT28AD3
MAX6469UT285AD3
MAX6469UT285BD3
MAX6469UT30BD3
MAX6469UT33AD3
MAX6470TA15BD3
MAX6470TA18AD3
MAX6470TA25BD3
MAX6470TA28AD3
MAX6470UT285AD3
MAX6470UT285BD3
MAX6470TA30BD3
MAX6470TA33AD3
MAX6470UT15BD3
MAX6470UT18AD3
MAX6470UT25BD3
MAX6470UT28AD3
MAX6470UT30BD3
MAX6470UT33AD3
MAX6471TA15AD3
MAX6471TA18BD3
MAX6471TA25AD3
MAX6471TA28BD3
MAX6471TA30AD3
MAX6471TA33BD3
MAX6471UT15AD3
MAX6471UT18BD3
MAX6471UT25AD3
TOP MARK
ADO
ADP
ADQ
ACT
ACW
AEG
ADR
ADS
AEH
ABKS
ABKT
ABKU
ABFF
ABMZ
ABNA
ABKV
ABKW
ADT
AEI
AEJ
ABLJ
ABFI
ABLK
ABLL
ABLM
ABLN
AEK
ADU
AEL
ADV
AEM
ADW
ABNB
ABNC
ADY
AEN
AEO
AEP
ABLO
ABLP
ABLQ
ABLR
ABLS
ABLT
AEQ
ACU
ABKX
ABKY
ABKZ
ABLA
ABLB
ABLC
ADZ
AER
AES
AEA
AEB
AEC
AED
AEE
ABLD
ABLE
ABLF
______________________________________________________________________________________ 13
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Table 4. Standard Versions (continued)
DEVICE
MAX6474TA28BD3
MAX6474TA30AD3
MAX6474TA33BD3
MAX6474UT15AD3
MAX6474UT18BD3
MAX6474UT25AD3
MAX6474UT28BD3
MAX6474UT30AD3
MAX6474UT33BD3
MAX6475TA15BD3
MAX6475TA18AD3
MAX6475TA25BD3
MAX6475TA28AD3
MAX6475TA30BD3
MAX6475TA33AD3
MAX6475UT15BD3
MAX6475UT18AD3
MAX6475UT25BD3
MAX6475UT28AD3
MAX6475UT30BD3
MAX6475UT33AD3
MAX6476TA15BD3
MAX6476TA18AD3
MAX6476TA25BD3
MAX6476TA28AD3
MAX6476TA30BD3
MAX6476TA33AD3
MAX6476UT15BD3
MAX6476UT18AD3
MAX6476UT25BD3
MAX6476UT28AD3
MAX6476UT30BD3
MAX6476UT33AD3
MAX6477BL15BD3
MAX6477BL18AD3
MAX6477BL25BD3
MAX6477BL28AD3
MAX6477BL30BD3
MAX6477BL33AD3
MAX6478BL15BD3
MAX6478BL18AD3
MAX6478BL25BD3
TOP MARK
AET
DEVICE
MAX6478BL28AD3
MAX6478BL30BD3
MAX6478BL33AD3
MAX6479BL15AD3
MAX6479BL18BD3
MAX6479BL25AD3
MAX6479BL28BD3
MAX6479BL30AD3
MAX6479BL33BD3
MAX6480BL15BD3
MAX6480BL18AD3
MAX6480BL25BD3
MAX6480BL28AD3
MAX6480BL30BD3
MAX6480BL33AD3
MAX6481BL15BD3
MAX6481BL18AD3
MAX6481BL25BD3
MAX6481BL28AD3
MAX6481BL30BD3
MAX6481BL33AD3
MAX6482BL15BD3
MAX6482BL18AD3
MAX6482BL25BD3
MAX6482BL28AD3
MAX6482BL30BD3
MAX6482BL33AD3
MAX6483BL15BD3
MAX6483BL18AD3
MAX6483BL25BD3
MAX6483BL28AD3
MAX6483BL30BD3
MAX6483BL33AD3
MAX6484BL15BD3
MAX6484BL18AD3
MAX6484BL25BD3
MAX6484BL28AD3
MAX6484BL30BD3
MAX6484BL33AD3
TOP MARK
ACE
ACF
ACG
ACH
ACI
AEU
AEV
ABLU
ABLV
ABLW
ABLX
ABLY
ABLZ
AEW
AEX
ACJ
ACK
ACL
ACM
ACN
ACO
ACP
ACQ
ACR
ABJ
AEY
AEZ
AFA
ACZ
ABMA
ABMB
ABMC
ABMD
ABME
ABFL
AFB
ACS
ACT
ACU
ACV
ACW
ACX
ACY
ACZ
ADA
ADB
ADC
ADD
ADE
ADF
ADG
ADH
ADI
AFC
AFD
AFE
AEF
AFG
ABMF
ABMG
ABMH
ABMI
ABMJ
ABMK
ABW
ABG
ADJ
ADK
ADL
ADM
ADN
ADO
ADP
ABX
ABY
ABZ
ACA
ACB
Sample stock is generally available on standard versions only.
Standard versions require a minimum order increment of 2.5k
units. Nonstandard versions must be ordered in 10k-unit incre-
ments. Contact factory for availability.
ACC
ACD
14 ______________________________________________________________________________________
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Pin Configurations
TOP VIEW
IN
IN
1
2
3
4
8
7
6
5
OUT
OUT
SET
IN
GND
1
2
3
6
5
4
OUT
IN
GND
MR
1
2
3
6
5
4
OUT
MAX6469
MAX6470
MAX6469
MAX6470
MAX6471
MAX6472
SET
SET
GND
SHDN
RESET
SHDN
RESET
RESET
THIN QFN
SOT23-6
SOT23-6
IN
IN
1
2
3
4
8
7
6
5
OUT
IN
IN
1
2
3
4
8
7
6
5
OUT
IN
1
2
3
6
5
4
OUT
MR
OUT
OUT
MR
MAX6473
MAX6474
MAX6471
MAX6472
MAX6473
MAX6474
GND
GND
MR
SET
GND
RESET
SHDN
RESET
SHDN
RESET
THIN QFN
THIN QFN
SOT23-6
IN
1
2
3
6
5
4
OUT
IN
IN
1
2
3
4
8
7
OUT
OUT
FB
MAX6475
MAX6476
MAX6475
MAX6476
GND
FB
GND
6
5
SHDN
RESET
SHDN
RESET
THIN QFN
SOT23-6
UCSP DEVICES SHOWN AS
MOUNTED ON PC BOARD.
BALL SOLDERED DOWN.
A1
OUT
SET
C1
C2
C3
IN
A1
A2
A3
OUT
C1
C2
C3
IN
MAX6477
MAX6478
MAX6481
MAX6482
A2
A3
GND
SHDN
MR
GND
RESET
RESET
SHDN
3 x 3 UCSP
3 x 3 UCSP
A1
A2
A3
A1
A2
A3
OUT
SET
C1
C2
C3
IN
OUT
FB
C1
C2
C3
IN
MAX6479
MAX6480
MAX6483
MAX6484
GND
MR
GND
SHDN
RESET
RESET
3 x 3 UCSP
3 x 3 UCSP
______________________________________________________________________________________ 15
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Functional Diagrams
THERMAL SENSOR
THERMAL SENSOR
REVERSE
LEAKAGE
PROTECTION
IN
REVERSE
LEAKAGE
PROTECTION
IN
OUT
OUT
SHDN
SHDN
MOS DRIVER WITH
CURRENT LIMIT
MOS DRIVER WITH
CURRENT LIMIT
FB
ERROR
AMP
ERROR
AMP
SET
FEEDBACK-MODE
COMPARATOR
MAX6475/MAX6476
MAX6483/MAX6484
1.23V
1.23V
185mV
RESET
TIMEOUT
OUTPUT
STAGE
RESET
TIMEOUT
OUTPUT
STAGE
RESET
RESET
RESET
COMPARATOR
RESET
COMPARATOR
MAX6469–MAX6474
MAX6477–MAX6482
GND
GND
MR
Typical Operating Circuit
Chip Information
TRANSISTOR COUNT: 1041
PROCESS: BiCMOS
2.5V TO 5.5V
IN
V
CC
SHDN
OUT
3.3µF
MAX6469/MAX6470
MAX6477/MAX6478
µP
SET
RESET
GND
RESET
GND
16 ______________________________________________________________________________________
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Ordering Information (continued)
PIN-
PACKAGE
PART
TEMP RANGE
MAX6471UT_ _ _D_-T
MAX6471TA_ _ _D_*
MAX6472UT_ _ _D_-T
MAX6472TA_ _ _D_*
MAX6473UT_ _ _D_-T
MAX6473TA_ _ _D_*
MAX6474UT_ _ _D_-T
MAX6474TA_ _ _D_*
MAX6475UT_ _ _D_-T
MAX6475TA_ _ _D_*
MAX6476UT_ _ _D_-T
MAX6476TA_ _ _D_*
MAX6477BL_ _ _D_-T
MAX6478BL_ _ _D_-T
MAX6479BL_ _ _D_-T
MAX6480BL_ _ _D_-T
MAX6481BL_ _ _D_-T
MAX6482BL_ _ _D_-T
MAX6483BL_ _ _D_-T
MAX6484BL_ _ _D_-T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
6 SOT23-6
8 Thin QFN
6 SOT23-6
8 Thin QFN
6 SOT23-6
8 Thin QFN
6 SOT23-6
8 Thin QFN
6 SOT23-6
8 Thin QFN
6 SOT23-6
8 Thin QFN
6 UCSP
6 UCSP
6 UCSP
6 UCSP
6 UCSP
6 UCSP
6 UCSP
6 UCSP
*Future product—contact factory for availability.
Note: The first “_ _ are placeholders for the output voltage levels
”
of the devices. Desired output voltages are set by the suffix found
in the Output Voltage Suffix Guide (Table 1). The third “_” is a
placeholder for the reset threshold accuracy. Desired reset
threshold accuracy is set by the suffix found in the Reset
Threshold Accuracy Guide (Table 2). The “_” following the D is a
placeholder for the reset timeout delay time. Desired reset timeout
delay time is set by the suffix found in the Reset Timeout Delay
Guide (Table 3). For example, the MAX6481BL30BD4-T has a
3.0V output voltage, 12.5% reset threshold tolerance, and a
1200ms (min) reset timeout delay. Sample stock is generally avail-
able on standard versions only (Table 4). Standard versions
require a minimum order increment of 2.5k units. Nonstandard
versions must be ordered in 10k-unit increments. Contact factory
for availability.
______________________________________________________________________________________ 17
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Selector Guide
PUSH-PULL
RESET
OPEN-DRAIN
PART
SET
SHDN
MR
FB
PACKAGE
RESET
MAX6469
MAX6470
MAX6471
MAX6472
MAX6473
MAX6474
MAX6475
MAX6476
MAX6477
MAX6478
MAX6479
MAX6480
MAX6481
MAX6482
MAX6483
MAX6484
√
√
√
√
—
—
√
—
—
—
—
—
—
√
√
—
√
—
√
SOT23-6/8-QFN
SOT23-6/8-QFN
SOT23-6/8-QFN
SOT23-6/8-QFN
SOT23-6/8-QFN
SOT23-6/8-QFN
SOT23-6/8-QFN
SOT23-6/8-QFN
3 x 3 UCSP B9-3
3 x 3 UCSP B9-3
3 x 3 UCSP B9-3
3 x 3 UCSP B9-3
3 x 3 UCSP B9-3
3 x 3 UCSP B9-3
3 x 3 UCSP B9-3
3 x 3 UCSP B9-3
√
—
—
√
—
√
√
√
—
√
—
—
—
—
√
√
—
√
√
√
—
√
√
—
—
—
—
√
—
√
√
√
—
√
√
—
—
—
—
—
—
√
—
√
√
√
—
√
√
—
—
√
—
√
√
√
—
√
—
—
—
—
√
—
√
√
√
—
√
√
—
—
—
√
√
√
—
18 ______________________________________________________________________________________
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
______________________________________________________________________________________ 19
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, 6, 8 & 10L,
QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
COMMON DIMENSIONS
SYMBOL
MIN.
0.70
2.90
2.90
0.00
0.20
MAX.
A
D
E
A1
L
0.80
3.10
3.10
0.05
0.40
k
0.25 MIN
0
A20.2 REF.
PACKAGE VARIATIONS
PKG. CODE
T633-1
N
6
D2
E2
e
JEDEC SPEC
MO229 / WEEA
MO229 / WEEC
b
[(N/2)-1] x e
1.90 REF
1.95 REF
1.50–0.10 2.30–0.10 0.95 BSC
1.50–0.10 2.30–0.10 0.65 BSC
0.40–0.05
0.30–0.05
T833-1
8
T1033-1
10
1.50–0.10 2.30–0.10 0.50 BSC MO229 / WEED-3 0.25–0.05 2.00 REF
PACKAGE OUTLINE, 6, 8 & 10L,
QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
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.
20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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