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MAX1534ETE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
General Description
The MAX1534 is a high-efficiency, triple-output power
supply for keep-alive (always on) voltage rails. The
500mA buck regulator with an internal current-limited
0.5Ω PMOS steps down the battery or wall adapter
supply rail to a fixed 5V or an adjustable output voltage.
Two integrated low-voltage linear regulators follow this
output and provide two independent preset output volt-
ages of 3.3V and 1.8V, or adjustable output voltages.
The buck regulator utilizes a peak current-limit, pulse-
frequency modulation (PFM) architecture for highest
light-load efficiency to conserve battery life. High
switching frequencies (up to 200kHz) allow the use of
tiny surface-mount inductors and output capacitors.
Operation to 100% duty cycle minimizes dropout volt-
age (250mV at 500mA).
The low-dropout linear regulators use an internal
P-channel metal-oxide (PMOS) pass transistor to mini-
mize supply current and deliver up to 160mA each of
continuous current.
The MAX1534 includes a power-OK (POK) signal that
indicates all outputs are in regulation. The 4% accurate
threshold of the SHDN input permits its use as a low-
battery detector.
The MAX1534 is available in a small 16-pin thin QFN
(4mm ✕ 4mm) package, occupying 33% less board
space than discrete solutions.
Applications
Features
♦ One Switching and Two Linear Regulators
♦ Switching Regulator
+4.5V to +24V Input Voltage Range
Over 95% Efficiency
Up to 500mA Output Current
Up to 200kHz Switching Frequency
Fixed 5V or Adjustable Output Voltage
Internal 0.5Ω PMOS Switch
100% Maximum Duty Cycle for Low-Dropout
Operation
♦ Two Low-Dropout Linear Regulators
Up to 160mA Output Current (Each)
3.3V/Adj Output Voltage for OUT1
1.8V/Adj Output Voltage for OUT2
♦ ±1.5% Accurate Output Voltage
♦ ±4% Accurate Shutdown for Low Battery
Detection
♦ Thermal Shutdown Protection
♦ POK Output
♦ 1mW Typical Standby Power
MAX1534
High-Efficiency, Triple-Output, Keep-Alive
Power Supply for Notebook Computers
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-2662; Rev 0; 10/02
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.
PART
TEMP RANGE
PIN-PACKAGE
MAX1534ETE
-40°C to +85°C
16 Thin QFN (4mm × 4mm)
MAX1534
POK
BP
PRESET
ILIM
V
OUT1
= +3.3V ALWAYS
V
OUT3
= +5V ALWAYS
V
IN
= +7V TO +24V
V
OUT2
= +1.8V ALWAYS
FB1
FB2
OUT1
OUT2
LDOIN
LX
FB3
IN
SHDN
GND
Typical Operating Circuit
Notebook and Sub-
Notebook Computers
Wake-On LAN
2 to 4 Li+ Cells Battery-
Powered Devices
Hand-Held Devices
Keep-Alive Supplies
Standby Supplies
Pin Configuration appears at end of data sheet.
MAX1534
High-Efficiency, Triple-Output, Keep-Alive
Power Supply for Notebook Computers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
IN, ILIM, PRESET, SHDN to GND...........................-0.3V to +25V
FB1, FB2, FB3, LDOIN, BP to GND..........................-0.3V to +6V
OUT1, OUT2, POK to GND ...................-0.3V to (V
LDOIN
+ 0.3V)
LX to GND.......................................................-2V to (V
IN
+ 0.3V)
OUT1, OUT2 Short Circuit to GND.............................Continuous
Peak IN Current........................................................................2A
Maximum IN DC Current...................................................500mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin Thin QFN (derate 16.9mW/°C
above +70°C)............................................................1349mW
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
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= 12V, ILIM = GND, PRESET = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
=
+25°C.)
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
UNITS
Input Voltage Range V
IN
4.5 24 V
Input Supply Current I
IN
No load, FB3 = 5.2V, LDOIN = GND 15 30 µA
Input Supply Current in
Dropout
I
IN(DROP)
N o l oad , FB3 = V
IN
= 4.5V , LD O IN = G N D
60 110 µA
Shutdown Supply Current SHDN = GND 3.5 7 µA
V
IN
rising 3.6 4.0 4.4
Input UVLO Threshold V
UVLO
V
IN
falling 3.5 3.9 4.3
V
BUCK REGULATOR
T
A
= +25°C to +85°C 4.92 5.00 5.08
FB3 Voltage Accuracy (Preset
Mode) (Note 1)
PRESET = GND
T
A
= 0°C to +85°C
4.90 5.00 5.10
V
T
A
= +25°C to +85°C 0.985 1.00 1.015
FB3 Set Voltage (Adjustable
Mode) (Note 1)
V
FB3
PRESET = IN
T
A
= 0°C to +85°C
0.98 1.00 1.02
V
FB3 Bias Current I
FB3
V
FB3
= 5.5V 3.5
6.25
µA
LX Switch Minimum Off-Time t
OFF(MIN)
0.22 0.42 0.62
µs
LX Switch Minimum On-Time t
ON(MIN)
0.50
µs
LX Switch Maximum On-Time t
ON(MAX)
91011µs
V
IN
= 6V 0.5 1.0
LX Switch On-Resistance R
LX
V
IN
= 4.5V 0.6 1.2
Ω
ILIM = IN
800 1000 1200
LX Current Limit I
LX(PEAK)
ILIM = GND
425 500
575
mA
LX Zero-Crossing Threshold -75
+75
mV
LX Zero-Crossing Timeout LX does not rise above threshold 30 µs
T
A
= +25°C1
LX Switch Leakage Current
V
IN
= 24V, not
switching
T
A
= 0°C to +85°C10
µA
Dropout Voltage
V
OUT3
(
DROPOUT
)
I
LX(DC)
= 500mA
250
mV
Line Regulation V
IN
= 8V to 24V, I
LX(DC)
= 200mA 0.1 %/V
Load Regulation I
LX(DC)
= 80mA to 400mA 0.9 %
LINEAR REGULATORS
LDOIN Input Voltage V
LDOIN
2.5 5.5 V
LDOIN Undervoltage Lockout V
UVLO(LDO)
V
LDOIN
rising, hysteresis = 40mV typ
2.15
2.4 V
MAX1534
High-Efficiency, Triple-Output, Keep-Alive
Power Supply for Notebook Computers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, ILIM = GND, PRESET = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
=
+25°C.)
PARAMETER SYMBOL CONDITIONS
TYP
MAX
UNITS
OUT1 Voltage Accuracy
(Preset Mode)
V
OUT1
PRESET = GND
I
OUT1
= 100µA to
160mA
3.20 3.30 3.37
V
OUT2 Voltage Accuracy
(Preset Mode)
V
OUT2
PRESET = GND
I
OUT2
= 100µA to
160mA
1.74 1.80 1.84
V
FB1, FB2 Set Voltage
(Adjustable Mode)
V
FB1
, V
FB2
PRESET = IN
I
OUT_
= 100µA to
160mA
0.97 1.00 1.02
V
FB1, FB2 Bias Current PRESET = IN, V
FB1
= V
FB2
= 1.1V -25
+25
nA
OUT1, OUT2 Adjustable Output
Voltage Range
V
OUT1
,
V
OUT2
PRESET = IN 1.0
V
LDOIN
V
Maximum OUT1 Output Current
I
OUT1(MAX)
Continuous
160
mA
OUT1 Current Limit
160
550 mA
Maximum OUT2 Output Current
I
OUT2(MAX)
Continuous
160
mA
OUT2 Current Limit
160
550 mA
LDOIN Current I
OUT1
= I
OUT2
= 0, V
LDOIN
= 5.5V
165
265 µA
LDO_ Dropout Voltage I
OUT_
= 80mA (Note 2)
120
240 mV
LDO_ Line Regulation
V
LDOIN
= (V
OUT_
+ 0.4V) or
+2.5V to +5.5V, I
OUT_
= 1mA
-0.2
0
+0.2
%/V
FAULT DETECTION
POK Threshold
OUT1, OUT2, and FB3 rising edge,
1% hysteresis (Note 3)
-13 -11 -9 %
POK Propagation Delay Falling edge, 50mV overdrive 10 µs
POK Output Low Voltage I
SINK
= 1mA 0.4 V
POK Leakage Current High state, forced to 5.5V 1 µA
Thermal Shutdown Threshold Typical hysteresis = 15°C
+160
°C
INPUTS AND OUTPUTS
SHDN Input Trip Level Rising trip level, 100mV hysteresis
0.96
1.0
1.04
V
Input Leakage Current V
SHDN
, V
PRESET
, V
ILIM
= 0 or 24V -1 +1 µA
Low 0.5 V
PRESET, ILIM Logic Levels
High 2.2 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX1534ETE+T

Mfr. #:
Buy MAX1534ETE+T
Manufacturer:
Maxim Integrated
Description:
Current & Power Monitors & Regulators PS Controllers for for Notebooks
Lifecycle:
New from this manufacturer.
Delivery:
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