19-2711; Rev 0; 1/03
Dual Low-Dropout Linear Regulators
with
RESET
or Low-Noise Output in UCSP or QFN
General Description
The MAX8530/MAX8531 offer the benefits of low-
dropout voltage and ultra-low power regulation in
subminiaturized UCSP and QFN packages with an inte-
grated microprocessor reset circuit (MAX8530 only).
The devices operate from a 2.5V to 6.5V input and
deliver up to 200mA and 150mA outputs with low
dropout of 100mV (typ) at 100mA. Designed with an
internal P-channel MOSFET pass transistor, the supply
current is kept at a low 130µA (with both LDOs on),
independent of the load current and dropout voltage.
Other features include short-circuit protection and
thermal-shutdown protection.
The MAX8530 provides microprocessor open-drain,
active-low reset output to monitor OUT1, eliminating
external components and adjustments. The MAX8530
asserts a 100ms (min)
RESET
signal when OUT1 drops
below 87% of the nominal output voltage. The MAX8531
includes a reference bypass pin for low output noise
(40µV
RMS
).
Both devices include a logic-controlled shutdown input
and are available in 6-bump UCSP and 6-pin thin QFN
exposed pad packages.
KIT
ATION
EVALU
LE
B
AVAILA
Features
o
Guaranteed 200mA Output Current for OUT1
o
Guaranteed 150mA Output Current for OUT2
o
Low 100mV (typ) Dropout at 100mA Load for
both LDOs
o
Open-Drain, Active-Low 100ms (min) Reset Timer
(MAX8530)
o
Low 40µV
RMS
Output Noise (MAX8531)
o
Low 130µA Operating Supply Current
o
<1µA Shutdown Current
o
Thermal-Overload and Short-Circuit Protection
o
Output Current Limit
o
Tiny Packages Available
1.16 x 1.57 x 0.6mm UCSP (3 x 2 Grid)
3mm x 3mm Thin QFN
MAX8530/MAX8531
Ordering Information
PART
TEMP RANGE
OUT_
PIN-
VOLTAGE PACKAGE
Applications
Cellular and Cordless Phones
PDAs and Palmtop Computers
Notebook Computers
Digital Cameras
PCMCIA Cards
Wireless LAN Cards
Hand-Held Instruments
MAX8530
EBTxy* -40°C to +85°C 1.5V to 3.3V 6 UCSP
MAX8530ETTxy* -40°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP**
MAX8531
EBTxy* -40°C to +85°C 1.5V to 3.3V 6 UCSP
MAX8531ETTxy* -40°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP
*xy
= Output voltage code (see the Output Voltage Selector
Guide).
**EP
= Exposed pad.
Pin Configurations appear at end of data sheet.
Output Voltage Selector Guide appears at end of data
sheet.
Typical Operating Circuit
INPUT
2.5V TO 6.5V
IN
C
IN
2.2µF
OUT1
2.2µF
1.5V TO 3.3V
AT 200mA
V
I/O
BASEBAND
µP
RESET
RESET
MAX8530
ON
OFF
SHDN
GND
OUT2
1µF
1.5V TO 3.3V
AT 150mA
V
CORE
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.
Dual Low-Dropout Linear Regulators
with
RESET
or Low-Noise Output in UCSP or QFN
MAX8530/MAX8531
ABSOLUTE MAXIMUM RATINGS
IN,
SHDN, RESET,
BP to GND .................................-0.3V to +7V
OUT1, OUT2 to GND...................................-0.3V to (VIN + 0.3V)
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (TA = +70°C)
6-Bump UCSP (derate 3.9mW/°C above +70°C) ........308mW
6-Lead QFN (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
6-Bump+ UCSP Solder Profile ....................................(Note 1)
6-Lead QFN Lead Temperature (10s) .........................+300°C
Note 1:
For UCSP solder profile information, visit www.maxim-ic.com/1st_pages/UCSP.html.
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
(IN = 3.8V,
SHDN
= IN, C
BP
= 10nF (MAX8531), T
A
=
-40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 2)
PARAMETER
Input Voltage
Undervoltage Lockout Threshold
SYMBOL
V
IN
V
UVLO
IN rising, hysteresis is 40mV (typ)
T
A
= +25°C, I
OUT1
= I
OUT2
= 1mA
Output Voltage Accuracy
T
A
= -40°C to +85°C, I
OUT1
= I
OUT2
= 1mA
T
A
= -40°C to +85°C, I
OUT1
= 0.1mA to 200mA,
I
OUT2
= 0.1mA to 150mA
OUT1
OUT2
OUT1
OUT2
No load
I
OUT1
= I
OUT2
= 100mA
IN = (OUT_ + 0.1V) to 3.8V
10Hz to 100kHz, C
OUT
= 10µF,
I
OUT
= 10mA
PSRR
100Hz, I
OUT
= 30mA
MAX8530
MAX8531
MAX8530
MAX8531
-0.2
320
40
60
62
0.01
0.1
1.6
0.4
T
A
= +25°C
T
A
= +85°C
0.7
0.8
160
10
100
1
CONDITIONS
MIN
2.5
2.15
-1
-2
-3
200
150
210
165
330
280
130
150
100
200
+0.2
550
500
220
2.25
TYP
MAX
6.5
2.42
+1
+2
+3
mA
mA
µA
mV
%/V
µV
RMS
dB
%
UNITS
V
V
Maximum Output Current
Current Limit
Ground Current
Dropout Voltage
Line Regulation
Output Voltage Noise
Ripple Rejection
SHUTDOWN
SHDN
Supply Current
SHDN
Input Threshold
SHDN
Input Bias Current
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
I
OUT_
I
LIM
I
Q
V
OUT_
- V
IN
I
OUT_
= 100mA (Note 3)
∆V
LNR
I
OFF
V
IH
V
IL
I
SHDN
SHDN
= 0, T
A
= +25°C
SHDN
= 0, T
A
= +85°C
Input high voltage
Input low voltage
SHDN
= IN or GND
µA
V
nA
T
SHDN
∆T
SHDN
T
J
rising
°C
°C
2
_______________________________________________________________________________________
Dual Low-Dropout Linear Regulators
with
RESET
or Low-Noise Output in UCSP or QFN
ELECTRICAL CHARACTERISTICS (continued)
(IN = 3.8V,
SHDN
= IN, C
BP
= 10nF (MAX8531), T
A
=
-40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 2)
PARAMETER
RESET OUTPUT (MAX8530 ONLY)
RESET
Threshold
RESET
Threshold Hysteresis
RESET
Output Voltage Low
(Open-Drain, Active Low)
RESET
Open-Drain
Output Leakage Current
RESET
Active Timeout Delay
V
OL
I
RESET
= 500µA, IN = 3.8V
I
RESET
= 100µA, IN = 1.2V
V
RESET
= 6.5V
T
A
= +25°C
T
A
= +85°C
100
V
TH
Percentage of nominal output, OUT1 falling,
when
RESET
falls.
84
87
0.5
10
10
0.001
0.01
200
360
20
40
1
89
%
%
mV
µA
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX8530/MAX8531
From OUT1 rising to
RESET
rising.
Note 2:
All units are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 3:
The dropout voltage is defined as V
IN
- V
OUT
, when V
OUT
is 100mV below the value of V
OUT
for V
IN
= V
OUT
+ 0.5V.
Specification applies only when V
OUT
≥
2.5V.
Typical Operating Characteristics
V
OUT1
= 3.3V, V
OUT2
= 1.5V, load = 80mA (both output voltages), V
IN
= 3.8V, C
OUT_
= 2.2µF, C
BP
= 0.01µF, C
IN
= 2.2µF, and T
A
= +25°C,
unless otherwise noted.
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8530 toc01
SUPPLY CURRENT
vs. LOAD CURRENT
MAX8530 toc02
SUPPLY CURRENT
vs. TEMPERATURE
180
160
SUPPLY CURRENT (µA)
140
120
100
80
60
40
20
0
80mA LOAD, BOTH OUTPUTS
MAX8530 toc03
250
200
180
160
SUPPLY CURRENT (µA)
140
120
100
80
60
40
20
BOTH OUTPUTS LOADED
200
200
SUPPLY CURRENT (µA)
80mA LOAD, BOTH OUTPUTS
150
NO LOAD
100
50
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
0
0
10
20
30
40
50
60
70
80
LOAD CURRENT (mA)
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Dual Low-Dropout Linear Regulators
with
RESET
or Low-Noise Output in UCSP or QFN
MAX8530/MAX8531
Typical Operating Characteristics (continued)
V
OUT1
= 3.3V, V
OUT2
= 1.5V, load = 80mA (both output voltages), V
IN
= 3.8V, C
OUT_
= 2.2µF, C
BP
= 0.01µF, C
IN
= 2.2µF, and T
A
= +25°C,
unless otherwise noted.
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8530 toc04
LDO DROPOUT VOLTAGE vs. V
OUT
MAX8530 toc05
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
0.8
0.6
OUTPUT VOLTAGE (%)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
MAX8530 toc06
250
120
100
DROPOUT VOLTAGE (mV)
80
60
40
20
0
1.0
DROPOUT VOLTAGE (mV)
200
150
I
OUT1
= 80mA
100
50
0
0
20 40 60 80 100 120 140 160 180 200
LOAD CURRENT (mA)
-1.0
2.5
2.6
2.7
2.8
2.9
V
OUT
(V)
3.0
3.1
3.2
3.3
-40
-15
10
35
60
85
TEMPERATURE (°C)
PSRR vs. FREQUENCY
CHANNEL-TO-CHANNEL ISOLATION (dB)
OUT2 = 2.85V
60
50
PSRR (dB)
40
30
20
10
0
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
OUT1 = 2.85V
100Ω LOAD
MAX8530 toc07
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY (MAX8531)
100Ω LOAD
70
60
50
40
30
20
10
0
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
10
0.01
MAX8530 toc08
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY (MAX8531)
MAX8530 toc09
70
80
10,000
NOISE DENSITY (nV
RMS
/√Hz)
1000
100
0.1
1
FREQUENCY (kHz)
10
100
OUTPUT NOISE (10Hz TO 100kHz)
(MAX8531)
MAX8530 toc10
LINE TRANSIENT
MAX8530 toc11
4.5V
V
IN
3.5V
1V/div
V
OUT_
500µV/
div
V
OUT_
20mV/div
AC-COUPLED
10ms/div
40µs/div
4
_______________________________________________________________________________________
Dual Low-Dropout Linear Regulators
with
RESET
or Low-Noise Output in UCSP or QFN
Typical Operating Characteristics (continued)
V
OUT1
= 3.3V, V
OUT2
= 1.5V, load = 80mA (both output voltages), V
IN
= 3.8V, C
OUT_
= 2.2µF, C
BP
= 0.01µF, C
IN
= 2.2µF, and T
A
= +25°C,
unless otherwise noted.
LOAD TRANSIENT
(V
IN
= 3.8V, I
LOAD
= 1mA TO 80mA)
LOAD TRANSIENT NEAR DROPOUT
MAX8530 toc13
MAX8530/MAX8531
MAX8530 toc12
V
OUT
20mV/div
AC-COUPLED
V
OUT
20mV/div
AC-COUPLED
50mA/div
I
LOAD
0
V
IN
= V
OUT
+ 0.1V
10µs/div
10µs/div
I
LOAD
50mA/div
0
RESET RESPONSE
(MAX8530)
MAX8530 toc14
SHUTDOWN RESPONSE
MAX8530 toc15
2V/
div
V
IN
0
2V/
div
0
2V/
div
0
V
SHDN
0
1ms/div
V
OUT-
2V/
div
0
V
OUT-
1V/
div
V
RESET
40ms/div
Pin Description
PIN
MAX8530
(QFN)
1
2
3
4
5
6
—
MAX8531 MAX8530
(UCSP)
(QFN)
1
2
3
4
5
—
6
B3
B2
B1
A1
A2
A3
—
MAX8531
(UCSP)
B3
B2
B1
A1
A2
—
A3
NAME
OUT2
IN
OUT1
GND
SHDN
RESET
BP
FUNCTION
Regulator 2 Output. Guaranteed 150mA output current.
Regulator Input
Regulator 1 Output. Guaranteed 200mA output current.
Ground. Also functions as a heatsink for the 6-pin QFN. Solder to a large
pad or the circuit board ground plane to maximize thermal dissipation.
Shutdown Input. A logic low shuts down both regulators. Connect to IN
for normal operation.
Reset Active-Low Open-Drain Output. Minimum timeout of 100ms.
RESET
is low in shutdown.
Reference Noise Bypass. Connect to a 0.01µF ceramic capacitor for
reduced noise at both outputs.
_______________________________________________________________________________________
5
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