MAX17127ETP+ Maxim Integrated Products, MAX17127ETP+ Datasheet
MAX17127ETP+
Specifications of MAX17127ETP+
Related parts for MAX17127ETP+
MAX17127ETP+ Summary of contents
Page 1
... Output Overvoltage Protection S Thermal Shutdown S Small 20-Pin, 4mm x 4mm Thin QFN Package S Ordering Information PART TEMP RANGE MAX17127ETP+ -40°C to +85°C +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Applications Notebook, Subnotebook, and Tablet Computer Displays Automotive Systems Handy Terminals Simplified Operating Circuit appears at end of data sheet. ...
Page 2
Six-String WLED Driver with Integrated Step-Up Converter ABSOLUTE MAXIMUM RATINGS V to AGND ........................................................-0.3V to +30V IN FB_ PGND .................................................-0.3V to +52V PGND to AGND ....................................................-0.3V to +0. PWM, EN, FPO, I.C. to AGND .....................-0.3V to ...
Page 3
Six-String WLED Driver with Integrated ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V COMP T = 0°C to +85°C, unless otherwise noted. Typical values are PARAMETER FPO OUTPUT FPO Off-Leakage Current Fault inactive, ...
Page 4
Six-String WLED Driver with Integrated Step-Up Converter ELECTRICAL CHARACTERISTICS (Circuit of Figure 12V COMP T = -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER V Input Voltage Range IN MAX17127 ...
Page 5
Six-String WLED Driver with Integrated ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V COMP T = -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER FB_ Minimum On-Time FAULT PROTECTION OVP Threshold ...
Page 6
Six-String WLED Driver with Integrated Step-Up Converter (Circuit of Figure 12V +25NC, unless otherwise noted LED CURRENT vs. BRIGHTNESS SETTING 200Hz PWM ...
Page 7
Six-String WLED Driver with Integrated (Circuit of Figure 12V +25NC, unless otherwise noted SWITCHING WAVEFORMS (V = 26V, BRIGHTNESS = 100 32V 120mA OUT OUT 1µs/div STARTUP WAVEFORMS ...
Page 8
Six-String WLED Driver with Integrated Step-Up Converter (Circuit of Figure 12V +25NC, unless otherwise noted LED-SHORT FAULT PROTECTION (BRIGHTNESS = 100%, 3 LEDs SHORT ON FB1) 10µs/div LINE-TRANSIENT RESPONSE (V = 21V 9V, ...
Page 9
Six-String WLED Driver with Integrated TOP VIEW COMP PWM PIN NAME 5V Linear Regulator Output DDIO a ceramic capacitor of 1FF or greater. Enable Pin high enables the MAX17127. An internal 200kI (typ) pulldown resistor ...
Page 10
Six-String WLED Driver with Integrated Step-Up Converter PIN NAME LED String 5 Cathode Connection. FB5 is the open-drain output of an internal regulator, which 7 FB5 controls current through FB5. FB5 can sink up to 30mA. If unused, connect FB5 ...
Page 11
Six-String WLED Driver with Integrated The MAX17127 typical operating circuit is shown as Figure 1. Table 1 lists some recommended components 26V C IN 4.7 µ 0.1 µ µ ...
Page 12
Six-String WLED Driver with Integrated Step-Up Converter Table 2. Component Suppliers SUPPLIER Murata Electronics North America, Inc. Nichia Corp. Sumida Corp. Toshiba America Electronic Components, Inc. Vishay V 5V LINEAR REGULATOR IN V DDIO FSLCT OSCILLATOR ERROR AMPLIFIER COMP Gm ...
Page 13
Six-String WLED Driver with Integrated Detailed Description The MAX17127 is a high-efficiency driver for arrays of white LEDs. It contains a fixed-frequency current-mode PWM step-up controller linear regulator, a dimming control circuit, an internal power MOSFET, and six ...
Page 14
Six-String WLED Driver with Integrated Step-Up Converter The MAX17127 can be placed into shutdown by pulling the EN pin low. When a critical failure is detected, the IC also enters shutdown mode. In shutdown mode, all functions of the IC ...
Page 15
Six-String WLED Driver with Integrated Overvoltage Protection To protect the step-up regulator when the load is open the output voltage becomes excessive for any rea- son, the MAX17127 features a dedicated overvoltage- feedback input (OVP). The OVP pin ...
Page 16
Six-String WLED Driver with Integrated Step-Up Converter Full-Scale and Low-Level LED Current The full-scale LED current is set by: × 20mA 180k I = LED_MAX R ISET The acceptable resistance range for ISET is 120kI < R < 360kI, which ...
Page 17
Six-String WLED Driver with Integrated The maximum output current in DCM is governed by the following equation × × f × η × LIM OUT_DCM(MAX × × V OUT OUT Inductor ...
Page 18
Six-String WLED Driver with Integrated Step-Up Converter Calculate the ripple current at that operating point and the peak current required for the inductor × V IN(MIN) OUT(MAX RIPPLE L V × OUT(MAX ...
Page 19
Six-String WLED Driver with Integrated The voltage rating and temperature characteristics of the output capacitor must also be considered. Rectifier Diode Selection The MAX17127’s high switching frequency demands a high-speed rectifier. Schottky diodes are recommended for most applications because of ...
Page 20
Six-String WLED Driver with Integrated Step-Up Converter FB Pin Maximum Voltage The current through each FB_ pin is controlled only during the step-up converter’s on-time. During the con- verter off-time, the current sources are turned off. The output voltage does ...
Page 21
Six-String WLED Driver with Integrated V ISET FSLCT I.C. EN PWM R_FPWM 3.3V FPO Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ Simplified Operating Circuit (Direct-PWM Mode DDIO PGND OVP COMP AGND MAX17127 FB1 FB2 FB3 FB4 FB5 FB6 EP ...
Page 22
... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 22 2010 Maxim Integrated Products © ...