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PDF MAX8531 Data sheet ( Hoja de datos )
| Número de pieza | MAX8531 | |
| Descripción | Dual Low-Dropout Linear Regulators with RESETor Low-Noise Output in UCSP or QFN | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2711; Rev 0; 1/03
EVAALVUAAILTAIOBNLEKIT
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
(40µVRMS).
Both devices include a logic-controlled shutdown input
and are available in 6-bump UCSP and 6-pin thin QFN
exposed pad packages.
Applications
Cellular and Cordless Phones
PDAs and Palmtop Computers
Notebook Computers
Digital Cameras
PCMCIA Cards
Wireless LAN Cards
Hand-Held Instruments
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 40µVRMS 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
Ordering Information
PART
TEMP RANGE
OUT_
VOLTAGE
PIN-
PACKAGE
MAX8530EBTxy* -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**
MAX8531EBTxy* -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
CIN
2.2µF
IN OUT1
MAX8530
RESET
1.5V TO 3.3V
AT 200mA
2.2µF
VI/O
BASEBAND
µP
RESET
ON
OFF
SHDN
GND
OUT2
1µF 1.5V TO 3.3V
AT 150mA
VCORE
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.
1 page  
Dual Low-Dropout Linear Regulators
with RESET or Low-Noise Output in UCSP or QFN
Typical Operating Characteristics (continued)
VOUT1 = 3.3V, VOUT2 = 1.5V, load = 80mA (both output voltages), VIN = 3.8V, COUT_ = 2.2µF, CBP = 0.01µF, CIN = 2.2µF, and TA = +25°C,
unless otherwise noted.
LOAD TRANSIENT
(VIN = 3.8V, ILOAD = 1mA TO 80mA)
MAX8530 toc12
LOAD TRANSIENT NEAR DROPOUT
MAX8530 toc13
VOUT
20mV/div
AC-COUPLED
VOUT
20mV/div
AC-COUPLED
ILOAD
VIN
VOUT-
VRESET
50mA/div
0
10µs/div
RESET RESPONSE
(MAX8530)
MAX8530 toc14
2V/
div
0
2V/
div
0
2V/
div
0
ILOAD
VIN = VOUT + 0.1V
10µs/div
50mA/div
0
SHUTDOWN RESPONSE
MAX8530 toc15
VOUT-
2V/
div
0
VSHDN
1V/
div
0
40ms/div
1ms/div
Pin Description
MAX8530
(QFN)
PIN
MAX8531 MAX8530
(QFN) (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 — A3 BP Reference Noise Bypass. Connect to a 0.01µF ceramic capacitor for
reduced noise at both outputs.
_______________________________________________________________________________________ 5
5 Page 
Dual Low-Dropout Linear Regulators
with RESET or Low-Noise Output in UCSP or QFN
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.)
COMMON DIMENSIONS
SYMBOL MIN. MAX.
A
0.70
0.80
D
2.90
3.10
E
2.90
3.10
A1
0.00
0.05
L
0.20
0.40
k 0.25 MIN
A2 0.20 REF.
PACKAGE VARIATIONS
PKG. CODE
N
D2
E2
T633-1
T833-1
6 1.50–0.10 2.30–0.10
8 1.50–0.10 2.30–0.10
T1033-1
10 1.50–0.10 2.30–0.10
e
0.95 BSC
0.65 BSC
0.50 BSC
JEDEC SPEC
MO229 / WEEA
MO229 / WEEC
MO229 / WEED-3
b [(N/2)-1] x e
0.40–0.05 1.90 REF
0.30–0.05 1.95 REF
0.25–0.05 2.00 REF
PACKAGE OUTLINE, 6, 8 & 10L,
QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX8531.PDF ] | |
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