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PDF MAX1537A Data sheet ( Hoja de datos )
| Número de pieza | MAX1537A | |
| Descripción | Main Power-Supply Controllers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4023; Rev 0; 4/06
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
General Description
The MAX1533A/MAX1537A are dual step-down, switch-
mode power-supply (SMPS) controllers with synchro-
nous rectification, intended for main 5V/3.3V power
generation in battery-powered systems. Fixed-frequen-
cy operation with optimal interleaving minimizes input
ripple current from the lowest input voltages up to the
26V maximum input. Optimal 40/60 interleaving allows
the input voltage to go down to 8.3V before duty-cycle
overlap occurs, compared to 180° out-of-phase regula-
tors where the duty-cycle overlap occurs when the
input drops below 10V. Output current sensing pro-
vides accurate current limit using a sense resistor.
Alternatively, power dissipation can be reduced using
lossless inductor current sensing.
Internal 5V and 3.3V linear regulators power the
MAX1533A/MAX1537A and their gate drivers, as well as
external keep-alive loads, up to a total of 100mA. When
the main PWM regulators are in regulation, automatic
bootstrap switches bypass the internal linear regulators,
providing currents up to 200mA from each linear output.
An additional 5V to 23V adjustable internal 150mA linear
regulator is typically used with a secondary winding to
provide a 12V supply.
The MAX1533A/MAX1537A include on-board power-up
sequencing, a power-good (PGOOD) output, digital
soft-start, and internal soft-shutdown output discharge
that prevents negative voltages on shutdown. The
MAX1533A is available in a 32-pin 5mm x 5mm thin
QFN package, and the MAX1537A is available in a 36-
pin 6mm x 6mm thin QFN package. The exposed back-
side pad improves thermal characteristics for
demanding linear keep-alive applications.
Applications
2 to 4 Li+ Cells Battery-Powered Devices
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1533AETJ -40°C to +85°C 32 Thin QFN 5mm x 5mm
MAX1533AETJ+ -40°C to +85°C 32 Thin QFN 5mm x 5mm
MAX1537AETX -40°C to +85°C 36 Thin QFN 6mm x 6mm
MAX1537AETX+ -40°C to +85°C 36 Thin QFN 6mm x 6mm
+Denotes lead-free package.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Features
♦ Fixed-Frequency, Current-Mode Control
♦ 40/60 Optimal Interleaving
♦ Accurate Differential Current-Sense Inputs
♦ Internal 5V and 3.3V Linear Regulators with
100mA Load Capability
♦ Auxiliary 12V or Adjustable 150mA Linear
Regulator (MAX1537A Only)
♦ Dual Mode™ Feedback—3.3V/5V Fixed or
Adjustable Output (Dual Mode) Voltages
♦ 200kHz/300kHz/500kHz Switching Frequency
♦ Versatile Power-Up Sequencing
♦ Adjustable Overvoltage and Undervoltage
Protection
♦ 6V to 26V Input Range
♦ 2V ±0.75% Reference Output
♦ Power-Good Output
♦ Soft-Shutdown
♦ 5µA (typ) Shutdown Current
Pin Configurations
TOP VIEW
32 31 30 29 28 27 26 25
ON5 1
ON3 2
FSEL 3
ILIM3 4
ILIM5 5
REF 6
GND 7
VCC 8
MAX1533A
24 FB5
23 LDO5
22 DL5
21 PGND
20 DL3
19 LDO3
18 FB3
17 CSL3
9 10 11 12 13 14 15 16
THIN QFN
5mm x 5mm
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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  
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High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = 12V, both SMPS enabled, VCC = 5V, FSEL = REF, SKIP = GND, VILIM_ = VLDO5, VINA = 15V, VLDOA = 12V,
ILDO5 = ILDO3 = ILDOA = no load, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Output Undervoltage-Protection
Trip Threshold
SYMBOL
CONDITIONS
With respect to error-comparator threshold
MIN
65
TYP
70
MAX UNITS
75 %
Output Undervoltage Fault-
Propagation Delay
tUVP
50mV overdrive
10 µs
Output Undervoltage-Protection
Blanking Time
PGOOD Lower Trip Threshold
PGOOD Propagation Delay
PGOOD Output Low Voltage
PGOOD Leakage Current
PGDLY Pullup Current
PGDLY Pulldown Resistance
PGDLY Trip Threshold
Thermal-Shutdown Threshold
GATE DRIVERS
DH_ Gate-Driver On-Resistance
DL_ Gate-Driver On-Resistance
DH_ Gate-Driver Source/Sink
Current
DL_ Gate-Driver Source Current
DL_ Gate-Driver Sink Current
Dead Time
LX_, BST_ Leakage Current
INPUTS AND OUTPUTS
Logic Input Voltage
Fault Enable Logic Input Voltage
Logic Input Current
SHDN Input Trip Level
ON_ Input Voltage
tBLANK From rising edge of ON_
tPGOOD_
IPGOOD_
With respect to error-comparator
threshold, hysteresis = 1%
Falling edge, 50mV overdrive
ISINK = 4mA
High state, PGOOD forced to 5.5V
PGDLY = GND
TSHDN Hysteresis = 15°C
RDH
RDL
IDH
IDL
IDL (SINK)
tDEAD
BST_ - LX_ forced to 5V
DL_, high state
DL_, low state
DH_ forced to 2.5V,
BST_ - LX_ forced to 5V
DL_ forced to 2.5V
DL_ forced to 2.5V
DL_ rising
DH_ rising
VBST_ = VLX_ = 26V
SKIP, hysteresis = 600mV
OVP, UVP, ONA
OVP, UVP, SKIP, ONA
Rising trip level
Falling trip level
Clear fault level/SMPS off level
Delay start level (REF)
SMPS on level
High
Low
High
Low
6144 /
fOSC
-14 -10 -7.5
4
REF-
0.2
10
5
10
REF
+160
0.4
1
6
25
REF+
0.2
s
%
µs
V
µA
µA
Ω
V
°C
1.5 5
1.7 5
0.6 3
2
1.7
3.3
35
26
<2 20
Ω
Ω
A
A
A
ns
µA
2.4
0.8
0.7 x
VCC
0.4
-1 +1
1.10 1.6 2.20
0.96 1 1.04
0.8
1.9 2.1
2.4
V
V
µA
V
V
_______________________________________________________________________________________ 5
5 Page 
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High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
Typical Operating Characteristics (continued)
(MAX1537A circuit of Figure 1, VIN = 12V, LDO5 = VCC = 5V, SKIP = GND, FSEL = REF, TA = +25°C, unless otherwise noted.)
DELAYED STARTUP WAVEFORM
(LIGHT LOAD)
MAX1533/37 toc16
3.3V
0A
5V
B
0
3.3V
0
0
2ms/div
A. ON5, 5V/div
B. 5V OUTPUT, 2V/div
C. 3.3V OUPUT, 2V/div
D. PGOOD, 2V/div
100Ω LOAD ON OUT5 AND OUT3, ON3 = REF
C
D
STARTUP WAVEFORM (HEAVY LOAD)
MAX1533/37 toc17
3.3V A
0
4V
2V B
0
2.5A C
0
5V
0
400μs/div
A. ON5, 5V/div
B. 5V OUTPUT, 2V/div
C. INDUCTOR CURRENT, 5A/div
D. LDO5, 1V/div
E. DL5, 5V/div
1.0Ω LOAD
D
E
SHUTDOWN WAVEFORM (NO LOAD)
MAX1533/37 toc18
2V A
0
5V
B
0
5V
C
0
3.3V
0
D
5V
E
0
0F
2ms/div
A. SHDN, 5V/div
D. 3.3V OUTPUT, 5V/div
B. 5V OUTPUT, 5V/div E. DL3, 5V/div
C. DL5, 5V/div
F. PGOOD, 5V/div
ON3 = ON5 = VCC, OVP = GND
SHUTDOWN WAVEFORM (1Ω LOAD)
MAX1533/37 toc19
2V A
0
5V B
5V
5A
0
5V
0
100μs/div
A. SHDN, 5V/div
B. LDO5, 2V/div
C. 5V OUTPUT, 2V/div
D. INDUCTOR CURRENT, 5A/div
E. DL5, 5V/div
ON3 = ON5 = VCC, OVP = GND
C
D
E
5V OUTPUT LOAD TRANSIENT
(FORCED-PWM)
MAX1533/37 toc20
4A
A
0
3.3V OUTPUT LOAD TRANSIENT
(FORCED-PWM)
MAX1533/37 toc21
4A
A
0
5V B 3.3V B
4A
0
12V
0
40μs/div
A. IOUT5 = 0.2A TO 4A, 5A/div
B. VOUT5 = 5.0V, 100mV/div
C. INDUCTOR CURRENT, 5A/div
D. LX5, 10V/div
SKIP = VCC
4A
C0
12V
D
0
40μs/div
A. IOUT3 = 0.2A TO 4A, 5A/div
B. VOUT3 = 3.3V, 100mV/div
C. INDUCTOR CURRENT, 5A/div
D. LX3, 10V/div
SKIP = VCC
C
D
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1537A.PDF ] | |
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