A Product Line of Diodes Incorporated PAM2322AGEAR Dual High-Efficiency PWM Step-Down DC-DC Converter ADVANCED INFORMATION Description Pin Assignments The PAM2322AGEAR is a dual step-down current-mode, DC-DC converter. At heavy load, the constant-frequency PWM control performs with excellent stability and transient response. To ensure the longest battery life in portable applications, the PAM2322AGEAR provides a power-saving Pulse-Skipping Modulation (PSM) mode to reduce quiescent current under light load operation The PAM2322AGEAR supports a range of input voltages from 2.7V to 5.5V, allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH cell, USB, and other standard power sources. Output 1 is a 1.8V fixed output. Output 2 is adjustable from 0.9V to VIN. Both outputs employ an internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. Output 1 delivers up to 1000mA output current while output 2 delivers up to 2000mA. Each regulator has an independent enable pin. Each output of the PAM2322AGEAR can be disabled when a logic low is applied to the channel enable pin. During shutdown, the input is disconnected from the output and the shutdown current is less than 0.1μA W-FLGA2520-17 Other key features include under-voltage lockout, soft-start, hiccup mode short circuit protection and thermal shutdown. Features Applications Supply Voltage:2.7V to 5.5V Portable Electronics Output Current: Personal Information Appliances Wireless and DSL Modems OUT1: 1000mA/Buck, 1.8V Fixed Output OUT2: 2000mA/Buck Switching Frequency:1.2MHz Internal Synchronous Rectifier Fast Transient Response Fast Turn On and Turn Off Internal Soft Start Internal Compensation 100% Duty Cycle Operation Power Good Indicator for OUT1 Under-Voltage Lockout Hiccup Mode Short Circuit Protection Thermal Shutdown Small W-FLGA2520-17 Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 1 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Typical Applications Circuit L1 1.5µH ADVANCED INFORMATION VIN 3.3V CIN 10uF VOUT1 1.8V SW1 VIN COUT1 10uF OUT1 CIN 10uF PG1 EN1 PG1 EN1 PAM2322 EN2 EN2 L2 1.0µH VOUT2 1.22V SW2 COUT2 10uF OUT2 GND COUT2 10uF Rfb_up 205kΩ FB2 Rfb_dn 200kΩ Pin Descriptions Function W-FLGA2520-17 Name 1, 15 SW2 Switch PIN for Output 2, PIN 1 and 15 can be connected on the PCB 2, 9, 16, 17 GND Ground pin, PIN 2, 9, 16, 17 can be connected on the PCB 3 OUT2 Output sense pin of Output 2 4 FB2 Feedback pin for Output 2, the reference is set internally to 0.6V 5 EN2 Enable for Output 2. Pull high to enable channel 2. Pull low to disable 6 PG1 Output 1 power good indicator pin, open drain output 7 EN1 Enable for Output 1. Pull high to enable channel 1. Pull low to disable 8 OUT1 Output pin of Output 1, Channel one is internally fixed to 1.8V 10 SW1 Switch Pin for Output 1 11, 12, 13, 14 VIN Input voltage pin. PIN 11, 12, 13, 14 can be connected on the PCB PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 2 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR ADVANCED INFORMATION Functional Block Diagram PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 3 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR ADVANCED INFORMATION Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) Parameter Input Voltage EN1, EN2, FB2 SW1 and SW2 Junction Temperature Storage Temperature Range Soldering Temperature ESD Susceptibility (Note 5) Human Body Model (HBM) Machine Model (MM) (Note 4) Rating -0.3 to +6.0 Unit V -0.3 to VIN V -0.3 to (VIN +0.3) 150 -65 to +150 260,10sec °C °C °C 1.5 150 kV V V Notes: 4. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. 5. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Parameter Supply Voltage Ambient Temperature Range Junction Temperature Range Rating 2.7 to 5.5 -40 to +85 -40 to +125 Unit V °C Thermal Information Parameter Package Symbol Maximum Thermal Resistance (Junction to Case) W-FLGA2520-17 JC 16 Thermal Resistance (Junction to Ambient) W-FLGA2520-17 JA 80 PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 4 of 13 www.diodes.com Unit °C/W September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Electrical Characteristics ADVANCED INFORMATION PARAMETER Input Voltage Range (TA= +25°C, VIN=3.3V, OUT1=1.8V, L1=1.5µH, OUT2=1.2V, L2=1.0µH, unless otherwise noted.) SYMBOL Test Conditions MIN TYP MAX UNITS VIN 2.7 3.3 5.5 V 2.35 2.5 2.65 V 400 mV -4 +4 % 0.591 0.60 0.609 V -2.7 2.7 % Output 1 1.5 A Output 2 3 A UVLO Threshold VUVLO Output1 Voltage Accuracy OUT1 OUT2 Feedback Voltage VFB2 Output2 Voltage Accuracy Current Limit OUT2 ILIM VIN Rising Hysteresis No Load VIN 3.0 to 3.6V, TA 0-70°C, VFB resistors 0.25% Quiescent Current IQ No load 60 100 µA Shutdown Current ISD VEN = 0V 0.1 µA SW Leakage Current ILSW VEN = 0V Oscillator Frequency fOSC Drain-Source On-State Resistance 1 µA 1.0 1.2 1.4 MHz IDS=100mA Output 1 P MOSFET 120 mΩ N MOSFET 80 mΩ IDS=100mA Output 2 P MOSFET 50 mΩ N MOSFET 40 mΩ VIN = 0 to 3.3V,Io=200mA 1000 µs EN = 0 to 3.3V, Io=200mA 300 µs EN = 3.3 to 0V, Io=5mA 7000 µs EN = 0 to 3.3V, Io=200mA Vo=1.1V to 1.2V EN = 3.3 to 0V, Io=5mA Vo=1.2V to 1.1V 300 µs 450 µs OUT1, SW1 EN1 transitions high to low 10 OUT2, SW2, FB2 EN2 transitions high to low 10 RDS(ON) Turn-on Time Ts Turn-off Time Toff Turn-on Pre-charge Time Tchg Turn-off Discharge Time Tdis High Impedance Delay µs EN1/EN2 Threshold High VEH 1.2 V EN1/EN2 Threshold Low VEL 0.4 V Over Temperature Protection OTP 150 °C OTP Hysteresis OTH 30 °C PG Pin Trigger Delay 90 us PG Pin Threshold (Relative to Vout) +/-10 % PG Open Drain Impedance (PG=PVin) 500K Ω PG Open Drain Impedance (PG=low) 100 Ω PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 5 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Electrical Characteristics (T = +25°C, VIN=3.3V, OUT1=1.8V, L1=1.5µH, OUT2=1.2V,L2=1.0µH, unless otherwise noted.) (cont.) A ADVANCED INFORMATION PARAMETER SYMBOL MIN TYP MAX UNITS OUT1 100 mA OUT2 200 mA OUT1 6 mA OUT2 20 mA IOUT1= 300uA to 600uA 55 % IOUT1= 10mA 82 % IOUT1= 300mA to 400mA 92 % IOUT2= 200uA to 300uA 50 % IOUT2= 10mA 80 % IOUT2= 900mA to 1200mA 90 % VLDR-OUT1 IOUT1= 100mA to 500mA 0.05% VO/mA VLDR-OUT2 IOUT2= 200mA to 1500mA 0.05% VO/mA VLNR-OUT1 VIN= 3.0V to 3.6V 0.1% VO/V VLNR-OUT2 VIN= 3.0V to 3.6V 0.1% VO/V PSM Threshold Test Conditions ITH PSM Hysteresis IHY EffiOUT1 Efficiency EffiOUT2 Load Regulation Line Regulation Application Information The typical application circuit of PAM2322AGEAR is shown on page 2. External component selection is determined by the load requirement, selecting inductors L1 and L2 first and then input capacitor CIN and output capacitor COUT. Inductor selection For most applications, the value of the inductor is in the range of 1μH to 3.3μH, which is chosen based on the desired current ripple. Large value inductor brings lower current ripple and small value inductor results in higher current ripple. Higher VIN and VOUT increase the current ripple as well shown in the following equation. For OUT1 with 1A loading current requirement, the reasonable current ripple starting point f is ΔIL = 0.4A (40% of 1A), For OUT2 with 2A loading current requirement, the reasonable current ripple starting point is ΔIL = 0.8A (40% of 2A) I L 1 Vout Vout 1 ( f )( L) Vin The DC current rating of the inductor should be at least equal to the maximum load current plus half of the current ripple to prevent core saturation. A low DC-resistance inductor is better to get higher efficiency. CIN and COUT selection To prevent input large voltage transient, a low ESR capacitor with the maximum RMS current must be used. The maximum capacitor RMS current is given by: VOUT VIN VOUT 2 1 C IN requiredI RMS I OMAX VIN This formula shows that IRMS has the maximum value at VIN =2VOUT, where IRMS = IOUT/2 and this worst-case is common used for design. PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 6 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Application Information (cont.) CIN and COUT selection (cont.) ADVANCED INFORMATION The selection of Cout is driven by the requirement of effective series resistance (ESR) and the output voltage ripple ΔVOUT is determined by: VOUT I L ESR 1 fCOUT 8 Where f is the operating frequency, COUT is output capacitance and ΔIL is rippling current flowing through the inductor. When output voltage is set, the output voltage ripple changes with the input voltage and is at its worst when input voltage reaches a high level. Using Ceramic Input and Output Capacitors Higher values, lower cost ceramic capacitors are now becoming available in smaller case sizes. Their high ripple current, high voltage rating and low ESR make them ideal for switching regulator applications. Using ceramic capacitors can achieve very low output ripple and small PCB size. X5R or X7R are preferred, because they have the better temperature and voltage characteristics. Output Voltage Setting PAM2322AGEAR output1 is fixed at 1.8V and cannot be adjusted. For other voltage options contact your Diodes representative. Output2 can be adjusted based on an external connected voltage divider. The internal reference of FB2 is 0.6V (Typical). The output voltage can be found based on the following calculation. The general output voltage is given in Table 1. R VOUT2 0.6 1 FB_UP R FB_LOW Table 1: Resistor Selection for Output 2 Voltage Setting VOUT2 Rfb_up Rfb_low 1.22V 1.5V 1.8V 2.5V 3.3V 205k 150k 300k 380k 680k 200k 100k 150k 120k 150k Pulse Skipping Mode (PSM) Description When load current decreases, the peak switch current from Power-PMOS is lower than skipping current threshold and the device will enter Pulse Skipping Mode. In this mode, the device has two states, working state and idle state. Firstly, the device enters working state controlled by internal error amplifier. When the feedback voltage gets higher than internal reference voltage, the device will enter idle state with internal blocks disabled. When the feedback voltage gets lower than the internal reference voltage, the convertor will enter the working state again. UVLO and Soft-Start The reference and the circuit remain reset until the VIN crosses its UVLO threshold. The PAM2322AGEAR has an internal soft-start circuit that limits the in-rush current during start-up. This prevents possible voltage drops of the input voltage and eliminates an output voltage overshoot. PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 7 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Application Information (cont.) ADVANCED INFORMATION Hiccup Mode Short Circuit Control When the converter output1 or output2 is shorted, or the device is overloaded during high-side MOSFET current-limit triggering, it will turn off the high-side MOSFET and turn on the low-side MOSFET. An internal counter is used to count the number of the current-limit triggering. The counter is reset when consecutive high-side MOSFET turn on without reaching current limit. If the current-limit condition persists, the counter fills up. The control logic then stops both high side and low side MOSFETs and waits for a hiccup period, before attempting a new soft-start sequence. The counter bit is decided by VFB voltage. If VFB≤0.2V, it is 3-bit counter; If VFB >0.2V it is 6-bit counter. The typical hiccup mode duty cycle is 1.7%. The hiccup mode is disabled during soft-start time. Over Temperature Protection The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. When the junction temperature exceeds +150°C, it shuts down the internal control circuit and switching power MOSFET. The PAM2322AGEAR will restart automatically under the control of soft-start circuit when the junction temperature decreases to +120°C. Power Good Flag PG1 pin is power good indicator. The output of this pin is an open drain with internal pull up resistor to VIN. PG is pulled up to VIN when the output1 voltage (1.8V) is within 10% of the regulation level, otherwise it is low. PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 8 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Typical Performance Characteristics (TA= +25°C, VIN=3.3V, OUT1=1.8V, L=1.5µH, OUT2=1.2V,L=1.0µH, unless otherwise noted.) 100 90 90 80 80 70 70 Efficiency (%) Efficiency (%) OUT2 Efficiency vs. Output Current 100 60 50 40 Vin=3.3V Vin=4.2V (Vin=5V) Vout1=1.8V 30 20 10 60 50 40 Vin=3.3V Vin=4.2V Vin=5V Vout2=1.2V 30 20 10 0 0 1 10 100 10 1000 100 1000 Output Current (mA) Output Current (mA) OUT1 Output Voltage vs. Output Current OUT2 Output Voltage vs. Output Current 1.210 1.816 1.208 1.814 1.206 1.812 1.204 1.810 Output Voltage (V) Output Voltage (V) ADVANCED INFORMATION OUT1 Efficiency vs. Output Current 1.808 1.806 1.804 1.802 Vin=3.3V Vin=4.2V Vin=5V Vout1=1.8V 1.800 1.798 1.796 1.202 1.200 1.198 1.196 1.194 1.192 1.190 Vin=3.3V Vin=4.2V Vin=5V Vout2=1.2V 1.188 1.186 1.794 1.184 1.792 1.182 1.180 1.790 0 100 200 300 400 500 600 700 800 900 1000 OUT1 Line Regulation vs. Input Voltage PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Output Current (mA) Output Current (mA) OUT2 Line Regulation vs. Input Voltage 9 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Typical Performance Characteristics (TA= +25°C, VIN=3.3V, OUT1=1.8V, L=1.5µH, OUT2=1.2V,L=1.0µH, unless otherwise noted.) 1.0 Line Regulation (%V) 0.8 0.8 Line Regulation (%V) 0.6 0.4 0.2 0.0 -0.2 Io=100mA Io=500mA Io=1000mA Vout1=1.8V -0.4 -0.6 0.6 0.4 0.2 0.0 -0.2 Io=100mA Io=1000mA Io=1500mA Vout2=1.2V -0.4 -0.6 -0.8 -0.8 -1.0 2.5 3.0 3.5 4.0 4.5 -1.0 2.5 5.0 3.0 3.5 Input Voltage (V) 75 Vin=2.7V Vin=3.5V Vin=4.2V Vout1=1.8V Vout2=1.2V; Io1=Io2=0A 70 65 95 85 80 75 70 55 65 -20 0 20 40 60 80 100 120 Vout1=1.8V Vout2=1.2V Io1=Io2=0A 90 60 50 -40 5.0 100 Dynamic Supply Current (uA) Dynamic Supply Current (uA) 80 4.5 Dynamic Supply Current vs. Input Current 90 85 4.0 Input Voltage (V) Dynamic Supply Current vs. Temperature 60 2.5 140 3.0 3.5 Temperature (oC) 4.0 4.5 5.0 5.5 Input Votage (V) PMOS Rdson vs. Temperature NMOS Rdson vs. Temperature 100 140 120 95 CH1 PMOS CH2 PMOS VIN=3.3V 90 NMOS Rdson (mohm) 130 PMOS Rdson(mohm) ADVANCED INFORMATION 1.0 110 100 90 80 70 85 80 CH1 NMOS CH2 NMOS VIN=3.3V 75 70 65 60 55 50 60 45 50 40 40 30 -40 35 -20 0 20 40 60 80 100 120 140 30 -40 PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 -20 0 20 40 60 80 100 120 140 Temperature (oC) Temperture(oC) 10 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Typical Performance Characteristics (TA= +25°C, VIN=3.3V, OUT1=1.8V, L=1.5µH, OUT2=1.2V,L=1.0µH, unless otherwise noted.) ADVANCED INFORMATION Enable turn on Vin=3.3V, Vout1=1.8V, Vout2=1.2V, Io1=1A, Io2=2A Enable turn off Vin=3.3V, Vout1=1.8V, Vout2=1.2V, Io1=1A, Io2=2A (CH1=Enable; CH2=Vout2; CH3=Vout1; CH4=PG) (CH1=Enable; CH2=Vout2; CH3=Vout1; CH4=PG) Output Ripple Output Ripple Vin=3.3V, Vout2=1.2V, Io2=0A Vin=3.3V, Vout2=1.2V, Io2=1A (CH1=Switch; CH3=Output Voltage; CH4=Inductor current) (CH1=Switch; CH3=Output Voltage; CH4=Inductor current) Output Short Protection Output Short Recovery Vin=3.3V, Vout2=1.2V, Io2=1A Vin=3.3V, Vout2=1.2V, Io2=1A (CH3=Output Voltage; CH4=Inductor Current) (CH3=Output Voltage; CH4=Inductor Current) PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 11 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Ordering Information ADVANCED INFORMATION PAM2322AGEAR Package Packing W-FLGA2520-17 7 Inch Tape & Reel Part Number Marking Package Type Standard Package PAM2322AGEAR CRA XYW W-FLGA2520-17 3,000 Units/Tape & Reel Marking Information Package Outline Dimensions (All dimensions in mm.) W-FLGA2520-17 A3 A1 Seating Plane A e E Pin #1 ID Pin #1 ID L D La W-FLGA2520-17 Dim Min Max A 0.700 0.800 A1 0 0.050 A3 0.0203REF b 0.200 0.300 D 2.420 2.580 E 1.950 2.050 e 0.500TYP L 0.320 0.480 La 0.424 0.576 All Dimensions in mm b PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 12 of 13 www.diodes.com September 2014 © Diodes Incorporated A Product Line of Diodes Incorporated PAM2322AGEAR Recommended Pad Layout W-FLGA2520-17 X3 ADVANCED INFORMATION X2 Dimensions Y2 Y3 X1(9x) Y1(9x) Y(8x) X(8x) C X X1 X2 X3 Y Y1 Y2 Y3 Value (in mm) 0.500 0.350 0.600 1.850 2.320 0.600 0.350 1.350 2.800 C IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2014, Diodes Incorporated www.diodes.com PAM2322AGEAR Document Number: DS36234 Rev. 2 - 2 13 of 13 www.diodes.com September 2014 © Diodes Incorporated