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MAX1522EUT+T

P1-P3P4-P6P7-P9P10-P12P13-P14
General Description
The MAX1522/MAX1523/MAX1524 are simple, compact
boost controllers designed for a wide range of DC-DC
conversion topologies, including step-up, SEPIC, and
flyback applications. They are for applications where
extremely low cost and small size are top priorities.
These devices are designed specifically to provide a
simple application circuit and minimize the size and
number of external components, making them ideal for
PDAs, digital cameras, and other low-cost consumer
electronics applications.
These devices use a unique fixed on-time, minimum off-
time architecture, which provides excellent efficiency
over a wide-range of input/output voltage combinations
and load currents. The fixed on-time is pin selectable to
either 0.5µs (50% max duty cycle) or 3µs (85% max
duty cycle), permitting optimization of external compo-
nent size and ease of design for a wide range of output
voltages.
The MAX1522/MAX1523 operate from a +2.5V to +5.5V
input voltage range and are capable of generating a
wide range of outputs. The MAX1524 is intended for
bootstrapped operation, permitting startup with lower
input voltage. All devices have internal soft-start and
short-circuit protection to prevent excessive switching
current during startup and under output fault condi-
tions. The MAX1522/MAX1524 have a latched fault
mode, which shuts down the controller when a short-
circuit event occurs, whereas the MAX1523 reenters
soft-start mode during output fault conditions. The
MAX1522/MAX1523/MAX1524 are available in a space-
saving 6-pin SOT23 package.
________________________Applications
____________________________Features
o Simple, Flexible Application Circuit
o 2-Cell NiMH or Alkaline Operation (MAX1524)
o Low Quiescent Current (25µA typ)
o Output Fault Protection and Soft-Start
o High Efficiency Over 1000:1 I
OUT
Range
o Pin-Selectable Maximum Duty Factor
o Micropower Shutdown Mode
o Small 6-Pin SOT23 Package
o No Current-Sense Resistor
MAX1522/MAX1523/MAX1524
Simple SOT23 Boost Controllers
________________________________________________________________
Maxim Integrated Products
1
__________Typical Operating Circuit
19-1926; Rev 1; 8/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART TEMP. RANGE
PIN-
PACKAGE
TOP
MARK
MAX1522EUT-T -40°C to +85°C 6 SOT23 AAOX
MAX1523EUT-T -40°C to +85°C 6 SOT23 AAOY
MAX1524EUT-T -40°C to +85°C 6 SOT23 AAOZ
MAX1522EUT+T -40°C to +85°C 6 SOT23 +AAOX
MAX1523EUT+T -40°C to +85°C 6 SOT23 +AAOY
MAX1524EUT+T -40°C to +85°C 6 SOT23 +AAOZ
Ordering Information
Pin Configuration
FB
SHDNSET
16V
CC
5 EXT
GND
MAX1522
MAX1523
MAX1524
SOT23
TOP VIEW
2
34
MAX1522
MAX1523
MAX1524
INPUT
OFF ON
6
3
4
5
2
1
V
CC
EXT
SET
FB
SHDN
GND
OUTPUT
V
CC
50% 85%
N
Low-Cost, High-Current,
or High-Voltage Boost
Conversion
LCD Bias Supplies
Industrial +24V and +28V
Power Supplies
Low-Cost, Multi-Output
Flyback Converters
SEPIC Converters
Low-Cost Battery-
Powered Applications
+
Denotes a lead(Pb)-free/RoHS-compliant package.
-
Denotes a package containing lead(Pb).
T = Tape and reel.
Simple SOT23 Boost Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= SHDN = 3.3V, SET = GND , T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
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.
Note 1: Actual startup voltage is dependent on the external MOSFET’s V
GS(TH)
.
Note 2: Specification applies after soft-start mode is completed.
V
CC
, FB, SHDN, SET to GND ...................................-0.3V to +6V
EXT to GND ................................................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........696mW
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
Soldering Temperature (reflow) ......................................+260°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Operating Voltage Range 2.5 5.5 V
MAX1522/MAX1523 2.5
V
CC
Minimum Startup Voltage
f
EXT
> 100kHz, MAX1524 (Note 1), bootstrap required 1.5
V
V
CC
rising 2.37 2.47
Undervoltage Lockout
Threshold
V
CC
falling 2.20 2.30
V
V
CC
Supply Current No load, nonbootstrapped 25 50 µA
V
CC
Shutdown Current SHDN = GND 0.001 1 µA
SET = GND 0.4 0.5 0.6
Fixed t
ON
Time V
FB
=1.2V
SET = V
CC
2.4 3.0 3.6
µs
V
FB
> 0.675V 0.5
Minimum t
OFF
Time
V
FB
< 0.525V 1.0
µs
SET = GND 45 50 55
Maximum Duty Factor
SET = V
CC
80 85 90
%
FB Regulation Threshold
(Note 2)
V
CC
= +2.5V to +5.5V 1.23 1.25 1.27 V
FB Undervoltage Fault
Threshold (Note 2)
FB falling 525 575 625 mV
FB Input Bias Current V
FB
= 1.3V 6 50 nA
EXT high 2 4
EXT Resistance I
EXT
= 20mA
EXT low 1.5 3
Ω
Soft-Start Ramp Time 2.2 3.2 4.2 ms
Logic Input High V
CC
= +2.5V to +5.5V, SET, SHDN 1.6 V
Logic Input Low V
CC
= +2.5V to +5.5V, SET, SHDN 0.4 V
Logic Input Leakage Current SET, SHDN = V
CC
or GND -1 +1 µA
MAX1522/MAX1523/MAX1524
MAX1522/MAX1523/MAX1524
Simple SOT23 Boost Controllers
_______________________________________________________________________________________
3
100
50
0.1 1 100 1000
EFFICIENCY vs. LOAD CURRENT
(DESIGN EXAMPLE 1)
70
80
90
MAX1522/3/4 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
10
60
V
OUT
= +5V
V
IN
= 3.3V
100
50
0.1 1 100 1000
EFFICIENCY vs. LOAD CURRENT
(DESIGN EXAMPLE 2)
70
80
90
MAX1522/3/4 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
10
60
V
IN
= +4.2V
V
IN
= +3.6V
V
IN
= +2.7V
V
OUT
= +12V
100
50
0.1 1 100 1000
EFFICIENCY vs. LOAD CURRENT
(DESIGN EXAMPLE 3)
70
80
90
MAX1522/3/4 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
10
60
V
IN
= +2.4V
V
IN
= +1.8V
V
IN
= +3V
MAX1524
V
OUT
= +5V
100
50
0.1 1 100
EFFICIENCY vs. LOAD CURRENT
(DESIGN EXAMPLE 4)
70
80
90
MAX1522/3/4 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
10
60
V
IN
= +4.2V
V
IN
= +2.7V
V
IN
= +3.6V
V
OUT
= +24V
100
50
0.1 1 100
EFFICIENCY vs. LOAD CURRENT
(DESIGN EXAMPLE 5)
70
80
90
MAX1522/3/4 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
10
60
V
IN
= +3.0V
V
IN
= +2.4V
V
IN
= +1.8V
MAX1524
V
OUT
= +3.3V
1.75
1.50
1.25
1.00
0.75
05025 75 100
STARTUP INPUT VOLTAGE
vs. OUTPUT CURRENT
MAX1522/3/4 toc06
LOAD CURRENT (mA)
STARTUP VOLTAGE (V)
V
OUT
= +3.3V
BOOTSTRAPPED
RESISTIVE LOADS
10
0.0001
01 3 4
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE
0.01
0.1
1
MAX1522/3/4 toc07
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
2
0.001
NONBOOTSTRAPPED
BOOTSTRAPPED
5
400ns/div
SWITCHING WAVEFORM
(CONTINUOUS CONDUCTION)
V
IN
= +3.3V, V
OUT
= +5V, I
OUT
= 350mA
A : V
OUT
, 200mV/div, AC-COUPLED
B : V
LX
, 5V/div
C : I
L
, 0.5A/div
A
C
B
MAX1522/3/4 toc08
4µs/div
SWITCHING WAVEFORM
(DISCONTINUOUS CONDUCTION)
V
IN
= +3.3V, V
OUT
= +24V, I
OUT
= 10mA
A : V
OUT
, 200mV/div, AC-COUPLED
B : V
LX
, 10V/div
C : I
L
, 0.5A/div
A
C
B
MAX1522/3/4 toc09
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX1522EUT+T

Mfr. #:
Buy MAX1522EUT+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Boost Controller
Lifecycle:
New from this manufacturer.
Delivery:
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