9-4190; Rev 0; 7/08 KIT ATION EVALU E L B A IL AVA Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED The MAX17065 provides the power-supply rails for activematrix, organic light-emitting diode (OLED) displays. The MAX17065 includes a step-up DC-DC converter, an inverting DC-DC converter, a regulated positive charge pump, a regulated negative charge pump, and a low-dropout linear regulator (LDO).
MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED ABSOLUTE MAXIMUM RATINGS IN, SDA, SCL, VMS, VDDIO to AGND ......................-0.3V to +6V SHDN, CLK to AGND ..............................-0.3V to (VDDIO + 0.3V) COMP, COMN to AGND...........................-0.3V to (VVMS + 0.3V) VD to AGND.................................................-0.3V to (VIN + 0.3V) LXP to PGND ..............................................-0.3V to (VVM + 0.3V) VM to PGND .......................
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED (Circuit of Figure 1, VP, VN, VL, VH enabled, default output values set according to Tables 7, 8, 9, skip mode enabled, VVM = 5.5V, VVN, VVH, VVL set 50mV beyond their regulation points (not switching), VIN = 3.3V, TA = 0°C to +85°C, unless otherwise noted.
MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VP, VN, VL, VH enabled, default output values set according to Tables 7, 8, 9, skip mode enabled, VVM = 5.5V, VVN, VVH, VVL set 50mV beyond their regulation points (not switching), VIN = 3.3V, TA = 0°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS CHARGE PUMPS VH Adjustable Voltage Range See Table 7 for output settings 5.5 9.
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED (Circuit of Figure 1, VP, VN, VL, VH enabled, default output values set according to Tables 7, 8, 9, skip mode enabled, VVM = 5.5V, VVN, VVH, VVL set 50mV beyond their regulation points (not switching), VIN = 3.3V, TA = 0°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS 100 kHz LOGIC INPUTS (SDA, SCL) I2C Frequency Range 10 0.
MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VP, VN, VL, VH enabled, default output values set according to Tables 7, 8, 9, skip mode enabled, VVM = 5.5V, VVN, VVH, VVL set 50mV beyond their regulation points (not switching), VIN = 3.3V, TA = -40°C to +85°C, unless otherwise noted.) (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS STEP-UP REGULATOR VM Regulation Voltage VIN = 2.3V to 4.
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED (Circuit of Figure 1, VP, VN, VL, VH enabled, default output values set according to Tables 7, 8, 9, skip mode enabled, VVM = 5.5V, VVN, VVH, VVL set 50mV beyond their regulation points (not switching), VIN = 3.3V, TA = -40°C to +85°C, unless otherwise noted.
ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VP, VN, VL, VH enabled, default output values set according to Tables 7, 8, 9, skip mode enabled, VVM = 5.5V, VVN, VVH, VVL set 50mV beyond their regulation points (not switching), VIN = 3.3V, TA = -40°C to +85°C, unless otherwise noted.) (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS 100 kHz LOGIC INPUTS (SDA, SCL) I2C Frequency Range 10 0.7 x VVD SDA, SCL Input Logic-High Voltage V 0.
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED -0.20 -0.10 -0.15 LOAD REGULATION (%) -0.05 0 MAX17065 toc05 MAX17065 toc04 0 LOAD REGULATION (%) -0.40 -0.60 -0.20 20 40 60 80 100 120 140 -1.0 -2.0 -1.00 0 20 40 60 80 100 0 120 4 8 12 20 16 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) VD OUTPUT LOAD REGULATION (VIN = 3.3V) VH OUTPUT LOAD REGULATION (VVH = 6.5V, CCH = 2.2nF, RCH = 47Ω) VL OUTPUT LOAD REGULATION (VVL = 4.
Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) VH, VL, VP, AND VN STARTUP (ON2 = 1) VM, VA, VH, AND VL STARTUP (ON1 = 1) IN SHUTDOWN SUPPLY CURRENT MAX17065 toc15 MAX17065 toc14 MAX17065 toc13 5 4 CURRENT (μA) MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED ON2 = 1 VVM 5V/div 2V/div VVP 0V 0V 3 2 VVA 0V 5V/div VVH 0V 5V/div 0V VVL 1 5V/div 5V/div VVN 0V 5V/div VVH 0V 0V VVL 5V/div ON1 = 1 0 2.0 2.5 3.
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED PIN NAME 1 SDA I2C-Compatible Serial Bidirectional Data Line. Internally connected to VD with a 10k resistor. FUNCTION 2 CLK External Wake-Up CMOS Oscillator. The fourth rising CLK pulse edge starts the IC. The CLK input frequency range is 10kHz to 10MHz. 3 4 VDDIO VD Supply Voltage for CLK and SHDN Input Logic 1.9V Low-Dropout Linear Regulator Output. Connect a 4.7μF capacitor to AGND.
MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED VVD +1.9V 60mA CDOUT 4.7μF VD IN BSTN LP 4.7μH CIN 10μF 0.1μF VIN 2.3V TO 4.5V LXP 0.1μF PGND LXN LN 4.7μH VVN -4.5V 120mA VM VMS REGN 0.1μF 0.1μF VN CNOUT 4.7μF VNS VP EP 470pF CPOUT 2.2μF 470pF 33kΩ CL+ COMP CH+ RCL 100Ω RCH 100Ω CCL 10nF CLVL CCH 2.2nF CHVH CVL 1μF VVP +5.35V 120mA MAX17065 33kΩ COMN VVL -4.0V 2mA CMOUT 4.7μF VVH +6.5V 2mA CVH 1μF SDA SCL 1.6V TO 3.
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED pump, and a low-dropout linear regulator (LDO). Synchronous rectifiers are integrated into the device to minimize the number of external components, and to save circuit board space. Figure 2 is the MAX17065 functional diagram. The MAX17065 provides all the power-supply rails for active-matrix OLED displays.
MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED Step-Up Converter (VM) Inverting Converter (VN) The step-up converter provides a fixed output voltage of +5.35V and provides up to 150mA of output current used to power the anode voltage supply (VP), the analog voltage supply (VA), the positive charge pump (VH), the negative charge pump (VL), and some of the IC’s internal circuitry through the step-up converter’s output-voltage sense pin (VMS).
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED 15ms (typ), which shuts down all outputs including VD, allowing the device to cool down. For continuous operation, do not exceed the absolute maximum junction temperature rating of TJ = +150°C. Since VD is latched off during a thermal-overload protection fault, the fault cannot be cleared through the I2C bus since the I2C bus is pulled up to VD through a 10kΩ resistor.
MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED Communication starts with the master signaling the beginning of a transmission with a START condition, which is a high-to-low transition on SDA while SCL is high. When the master has finished communicating with the slave, the master issues a STOP condition, which is a low-to-high transition on SDA while SCL is high. The bus is then free for another transmission.
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED sequence. Toggling ON2 to 0 has no effect if ON2 was previously set to 1 for less than 6ms. See Table 5. Setting both ON1 and ON2 to 0 clears the fault latches (see the Status Register (0x03) section). Step-Up and Inverting Converter Operating Mode Set SKIP/PWM to 0 for forced PWM or to 1 for skipmode operation of the step-up and inverting converters (VM and VN regulated outputs).
MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED Positive Charge-Pump Regulation Voltage (VH) Set the VH bits to program the VH regulation voltage according to Table 8. Table 8. VH[2:0] VN[3:0] VN REGULATION VOLTAGE (V) NOTES 0b0000 -0.5 Default condition 0b0001 -1.0 — 0b0010 -1.5 — VH[2:0] VH REGULATION VOLTAGE (V) NOTES 0b000 5.5 Default condition 0b0011 -2.0 — 0b001 6.0 — 0b0100 -2.5 — 0b010 6.5 — 0b0101 -3.0 — 0b011 7.
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED TEST1 TEST0 VA OUTPUT VH OUTPUT VL OUTPUT 0 0 Allowed Allowed Allowed 0 1 Allowed Allowed Allowed VP OUTPUT VN OUTPUT DISCHARGE Allowed Allowed Yes Not allowed Not allowed No 1 0 Allowed Allowed Allowed Allowed Not allowed No 1 1 Allowed Not allowed Not allowed Not allowed Not allowed No Status Register (0x03) This read-only register allows the fault status to be read through the I2C interface.
MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED Table 14.
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED 2) Calculate the maximum DC current in the inductor to select an inductor whose DC current rating is less than the maximum DC current calculated: ⎡ ⎤ VVN ILN(DC,MAX) = I VN(MAX) × ⎢1 + ⎥ ⎣⎢ η (MIN) × VIN(MIN) ⎥⎦ -4.5V ⎤ ⎡ = 0.120 A × ⎢1 + ⎥ ⎣ 0.8 × 2.3V ⎦ 0.150 A × 5.35V 2.3V × 0.87 = 401mA = = 0.
MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED where: CNOUT = The inverting converter’s output capacitance. ILN(PEAK) = The inverting converter’s peak inductor current from the Inductor Selections section. For ceramic capacitors, the output-voltage ripple is typically dominated by the capacitors. The voltage rating and temperature characteristics of the output capacitor must also be considered.
Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED and the negative charge-pump output voltage ripple is: 10nF × ( 5.35V - -4.0V ) 1μF + 10nF = 13.4mV VL RIPPLE = PCB Layout and Grounding Careful PCB layout is important for proper operation. Use the following guidelines for good PCB layout: 1) Place the 0.
Pin Configuration LXP N.C. PACKAGE TYPE 17 16 15 28 TQFN-EP VM 20 19 18 VP VA 21 VMS COMP TOP VIEW Package Information For the latest package outline information, go to www.maxim-ic.com/packages. VL 22 14 PGND CL- 23 13 IN CL+ 24 12 LXN CH- 25 11 BSTN CH+ 26 10 VN VH 27 8 REGN SCL 28 8 VNS 1 2 3 4 5 6 7 CLK VDDIO VD AGND SHDN COMN MAX17065 SDA MAX17065 Dual SMPS Outputs, LDO, and Dual Charge Pumps with I2C Interface for OLED PACKAGE CODE DOCUMENT NO.
