MAX1537ETX-T Maxim Integrated, MAX1537ETX-T Datasheet
![no-image](/images/no-image-200.jpg)
MAX1537ETX-T
Related parts for MAX1537ETX-T
MAX1537ETX-T Summary of contents
Page 1
... Thin QFN 5mm x 5mm MAX1533ETJ+ -40°C to +85°C 32 Thin QFN 5mm x 5mm MAX1537ETX -40°C to +85°C 36 Thin QFN 6mm x 6mm MAX1537ETX+ -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. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’ ...
Page 2
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers ABSOLUTE MAXIMUM RATINGS IN, SHDN, INA, LDOA to GND ...............................-0.3V to +30V GND to PGND .......................................................-0.3V to +0.3V LDO5, LDO3 GND .......................................-0.3V to +6V CC ILIM3, ILIM5, PGDLY to ...
Page 3
... INTERNAL FIXED LINEAR REGULATORS LDO5 Output Voltage LDO5 Undervoltage-Lockout Fault Threshold LDO5 Bootstrap Switch Threshold LDO5 Bootstrap Switch Resistance Idle Mode is a trademark of Maxim Integrated Products, Inc. _______________________________________________________________________________________ = 5V, FSEL = REF, SKIP = GND CONDITIONS Either SMPS, duty cycle = 10% to 90% FSEL = GND ...
Page 4
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V, both SMPS enabled load 0°C to +85°C, unless otherwise noted. ...
Page 5
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V, both SMPS enabled load 0°C to +85°C, unless otherwise noted. ...
Page 6
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V, both SMPS enabled load 0°C to +85°C, unless otherwise noted. ...
Page 7
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V, both SMPS enabled load -40°C to +85°C, unless otherwise noted.) ...
Page 8
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V, both SMPS enabled load -40°C to +85°C, unless otherwise noted.) ...
Page 9
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers (MAX1537 circuit of Figure 12V, LDO5 = V IN PWM5 EFFICIENCY vs. LOAD CURRENT (V = 5.0V) OUT5 100 ...
Page 10
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers (MAX1537 circuit of Figure 12V, LDO5 = V IN IDLE-MODE CURRENT vs. INPUT VOLTAGE 3.5 DUTY CYCLE 3.0 LIMITED 2.5 2.0 1.5 1.0 0.5 5V OUTPUT 0 0 ...
Page 11
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers (MAX1537 circuit of Figure 12V, LDO5 = V IN DELAYED STARTUP WAVEFORM (LIGHT LOAD) MAX1533/37 toc16 3. 3. 2ms/div A. ON5, 5V/div B. ...
Page 12
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers (MAX1537 circuit of Figure 12V, LDO5 = V IN 3.3V OUTPUT LOAD TRANSIENT (PULSE SKIPPING) MAX1533/37 toc22 12V 0 40µs/div ...
Page 13
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers PIN NAME MAX1533 MAX1537 — 1 ADJA 1 2 ON5 2 3 ON3 — 4 ONA 3 5 FSEL 4 6 ILIM3 5 7 ILIM5 6 8 REF 7 9 GND ...
Page 14
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers PIN NAME MAX1533 MAX1537 10 12 PGOOD UVP DH3 13 15 BST3 14 16 LX3 OVP CSH3 17 19 CSL3 18 20 FB3 ...
Page 15
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers PIN NAME MAX1533 MAX1537 25 27 CSL5 26 28 CSH5 LX5 29 31 BST5 30 32 DH5 SKIP 31 33 SHDN 32 34 — 35 INA ...
Page 16
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers Table 1. Component Selection for Standard Applications COMPONENT Input Voltage (2) 10µF, 25V C , Input Capacitor IN_ Taiyo Yuden TMK432BJ106KM 150µF, 6.3V, 40mΩ, low-ESR capacitor C , Output Capacitor OUT5 ...
Page 17
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers 5V LDO OUTPUT 10µ 5.8µH R CS1 10mΩ 3.3V PWM OUTPUT C OUT1 220µF 40mΩ C REF 0.22µ 100kΩ 60.4kΩ R5 60.4kΩ ON OFF ...
Page 18
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers SMPS to LDO Bootstrap Switchover When the 5V main output voltage is above the LDO5 bootstrap-switchover threshold, an internal 0.75Ω (typ) p-channel MOSFET shorts CSL5 to LDO5 while simulta- neously shutting ...
Page 19
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers LDO3 SHDN OSC FSEL SKIP ILIM3 CSH3 CSL3 BST3 DH3 LX3 LDO5 DL3 PGND FB3 ON3 OVP UVP PGDLY PGOOD Figure 2. MAX1533/MAX1537 Functional Diagram ______________________________________________________________________________________ 3.3V LINEAR REGULATOR REGULATOR LDO ...
Page 20
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers Table 3. Operating Modes INPUTS* MODE SHDN Shutdown Mode LOW Standby Mode HIGH Normal Operation HIGH 3.3V SMPS Active HIGH 5V SMPS Active HIGH Normal Operation (Delayed 5V SMPS HIGH Startup) ...
Page 21
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers CSH CSL 0 LIMIT SKIP SOFT-START COUNTER ON OSC -1 MAX1537 ONLY 0.8V ONE-SHOT SECONDARY FEEDBACK Figure 3: PWM-Controller Functional Diagram ______________________________________________________________________________________ AGND CURRENT DAC LIMIT ...
Page 22
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers Frequency Selection (FSEL) The FSEL input selects the PWM-mode switching fre- quency. Table 4 shows the switching frequency based on FSEL connection. High-frequency (500kHz) operation optimizes the application for the smallest ...
Page 23
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers I L IDLE ≥ t ON(SKIP OUT 0 TIME ON-TIME Figure 4. Pulse-Skipping/Discontinuous Crossover Point DC output accuracy specifications in the Electrical Characteristics table refer to the ...
Page 24
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers When adjusting both output voltages, set the 3.3V SMPS lower than the 5V SMPS. LDO5 connects to the 5V output (CSL5) through an internal switch only when CSL5 is above the ...
Page 25
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers C BYP LDO5 MAX1533 MAX1537 D BST (R )* BST BST C BST DH LX LDO5 GND (R )* OPTIONAL—THE RESISTOR LOWERS EMI BY DECREASING BST THE ...
Page 26
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers high. This turns on the synchronous-rectifier MOSFETs with 100% duty, rapidly discharging the output capaci- tors and clamping both outputs to ground. However, immediately latching DL_ high typically causes slightly negative ...
Page 27
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers Thermal Fault Protection The MAX1533/MAX1537 feature a thermal fault-protec- tion circuit. When the junction temperature rises above +160°C, a thermal sensor activates the fault latch, pulls PGOOD low, and shuts down ...
Page 28
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers • Maximum Load Current. There are two values to consider. The peak load current (I mines the instantaneous component stresses and fil- tering requirements and thus drives output-capacitor selection, inductor saturation ...
Page 29
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers + V V SEC FWD = OUT 5 RECT where L is the primary inductance the PRIMARY transformer turns ratio the minimum ...
Page 30
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers Alternatively, high-power applications that do not require highly accurate current-limit protection may reduce the overall power dissipation by connecting a series RC circuit across the inductor (Figure 9b) with an equivalent ...
Page 31
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers the filter capacitor’s ESR dominates the output voltage ripple. So the output capacitor’s size depends on the maximum ESR required to meet the output voltage rip- ple (V ) specifications: RIPPLE(P-P) ...
Page 32
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers This offers improved efficiency over a regular 180° out- of-phase architecture where the duty cycles begin to overlap below 10V. Figure 10 shows the input-capacitor RMS current vs. input voltage for ...
Page 33
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers Switching losses in the high-side MOSFET can become a heat problem when maximum AC-adapter voltages are applied, due to the squared term in the switching- 2 loss equation ( ...
Page 34
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers back-threshold voltage, the controller does not trigger an on-time pulse, effectively skipping a cycle. This allows the controller to maintain regulation above the maximum input voltage, but forces the controller to ...
Page 35
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers CONNECT THE EXPOSED PAD TO ANALOG GND VIA TO REF BYPASS CAPACITOR MAX1533 TOP LAYER SINGLE INDUCTOR n-CHANNEL MOSFETS INPUT HIGH-POWER LAYOUT Figure 11. PC Board Layout ______________________________________________________________________________________ CONNECT GND AND ...
Page 36
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers Pin Configurations (continued) TOP VIEW ADJA 1 ON5 2 ON3 3 ONA 4 FSEL 5 MAX1537 ILIM3 6 ILIM5 7 REF 8 GND 9 THIN QFN 6mm x 6mm 36 ______________________________________________________________________________________ ...
Page 37
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers (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.) MARKING XXXXX PIN # 1 I.D. C -DRAWING ...
Page 38
... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 38 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products ...