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MAX8530ETTP2+T

P1-P3P4-P6P7-P9P10-P12
MAX8530/MAX8531
Dual Low-Dropout Linear Regulators
with
RESET
or Low-Noise Output in UCSP or QFN
4 _______________________________________________________________________________________
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
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
18016014012010080604020
50
100
150
200
250
0
0 200
LDO DROPOUT VOLTAGE vs. V
OUT
MAX8530 toc05
V
OUT
(V)
DROPOUT VOLTAGE (mV)
3.23.13.02.92.82.72.6
20
40
60
80
100
120
0
2.5 3.3
I
OUT1
= 80mA
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
MAX8530 toc06
TEMPERATURE (°C)
OUTPUT VOLTAGE (%)
603510-15
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
-40 85
PSRR vs. FREQUENCY
MAX8530 toc07
FREQUENCY (kHz)
PSRR (dB)
1001010.1
10
20
30
40
50
60
70
0
0.01 1000
OUT2 = 2.85V
OUT1 = 2.85V
100Ω LOAD
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY (MAX8531)
MAX8530 toc08
FREQUENCY (kHz)
CHANNEL-TO-CHANNEL ISOLATION (dB)
100100.1 1
10
20
30
40
50
60
70
80
0
0.01 1000
100
Ω LOAD
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY (MAX8531)
MAX8530 toc09
FREQUENCY (kHz)
NOISE DENSITY (nV
RMS
/√Hz)
1010.1
100
1000
10,000
10
0.01 100
OUTPUT NOISE (10Hz TO 100kHz)
(MAX8531)
MAX8530 toc10
V
OUT_
500μV/
div
10ms/div
LINE TRANSIENT
MAX8530 toc11
V
OUT_
4.5V
40μs/div
V
IN
3.5V
1V/div
20mV/div
AC-COUPLED
MAX8530/MAX8531
Dual Low-Dropout Linear Regulators
with
RESET
or Low-Noise Output in UCSP or QFN
_______________________________________________________________________________________ 5
LOAD TRANSIENT
(V
IN
= 3.8V, I
LOAD
= 1mA TO 80mA)
MAX8530 toc12
I
LOAD
50mA/div
10μs/div
V
OUT
0
20mV/div
AC-COUPLED
Pin Description
PIN
MAX8530
(QFN)
MAX8531
(QFN)
MAX8530
(UCSP)
MAX8531
(UCSP)
NAME
FUNCTION
1 1 B3 B3
OUT2
Regulator 2 Output. Guaranteed 150mA output current.
2 2 B2 B2 IN Regulator Input
3 3 B1 B1
OUT1
Regulator 1 Output. Guaranteed 200mA output current.
4 4 A1 A1
GND
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.
5 5 A2 A2
SHDN
Shutdown Input. A logic low shuts down both regulators. Connect to IN
for normal operation.
6 — A3 —
RESET
Reset Active-Low Open-Drain Output. Minimum timeout of 100ms. RESET
is low in shutdown.
—6—A3BP
Reference Noise Bypass. Connect to a 0.01µF ceramic capacitor for
reduced noise at both outputs.
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 NEAR DROPOUT
MAX8530 toc13
I
LOAD
50mA/div
10μs/div
V
OUT
0
20mV/div
AC-COUPLED
V
IN
= V
OUT
+ 0.1V
RESET RESPONSE
(MAX8530)
MAX8530 toc14
V
OUT-
2V/
div
40ms/div
V
IN
0
V
RESET
2V/
div
0
2V/
div
0
SHUTDOWN RESPONSE
MAX8530 toc15
V
OUT-
1V/
div
1ms/div
0
V
SHDN
2V/
div
0
MAX8530/MAX8531
Detailed Description
The MAX8530/MAX8531 are low-power, low-dropout,
low-quiescent current linear regulators with reset
designed primarily for battery-powered applications.
For preset output voltages, refer to the Output Voltage
Selector Guide. Other combinations between 1.5V and
3.3V are available in 50mV increments. This device
supplies loads up to 200mA for OUT1 and 150mA for
OUT2. The MAX8530/MAX8531 consist of a 1.25V ref-
erence, error amplifiers, P-channel pass transistors,
reset block, and internal feedback voltage-dividers.
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares
this reference with the feedback voltage and amplifies
the difference. If the feedback voltage is lower than the
reference voltage, the pass-transistor gate is pulled
lower, allowing more current to pass to the output and
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 an internal resistor voltage-divider
connected to the OUT_ pin.
RESET
The reset circuit is active at power-up and power-down.
RESET is held low at power-up. The reset timing starts
once the OUT1 voltage reaches 87% (typ) of its regula-
tion voltage. The RESET signal goes high 200ms (typ)
after the OUT1 voltage reaches 87% (typ) of its regulation
voltage. At power-off, RESET goes low when the OUT1
voltage is below 87% (typ) of its regulation voltage.
Dual Low-Dropout Linear Regulators
with
RESET
or Low-Noise Output in UCSP or QFN
6 _______________________________________________________________________________________
P
N
ERROR
AMP
IN
SHDN
GND
OUT1
RESET*
* MAX8530 ONLY
**MAX8531 ONLY
BP**
OUT2
MOS
DRIVER
WITH I
LIMIT
DELAY
THERMAL
SENSOR
LDO2
87%
REF
1.25V
REF
SHUTDOWN
AND
POWER-ON
CONTROL
MAX8530
MAX8531
Functional Diagram
P1-P3P4-P6P7-P9P10-P12

MAX8530ETTP2+T

Mfr. #:
Buy MAX8530ETTP2+T
Manufacturer:
Maxim Integrated
Description:
LDO Voltage Regulators Dual Low-Dropout Linear Regulator
Lifecycle:
New from this manufacturer.
Delivery:
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