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| Global Mixed-mode Technology Inc. G5122 Micro-power Inverting DC/DC Converters in SOT-23-5 Features Configurable Output Voltage Up to -30V 20A Quiescent Current <1A Shutdown Current <1A Shutdown Pin Current Supply Range from 2.5V to 6.5V Low RDS(ON): 0.8 Tiny SOT23-5 Package General Description The G5122 inverting DC/DC converter is designed for small/ medium size LCD panel of high bias voltage. Due to a typical 20A quiescent current and 2.5V~ 6.5V supply voltage range, it is suitable for battery powered portable applications. Such as PDAs and Handheld Computers. When the IC sets to shutdown mode, it only consumes less than 1A. Furthermore, the 350mA current limit, 500ns fixed minimum off-time and tiny SOT23-5 package facilitates the use of smaller inductor and other surface-mount components to minimize the PCB size in those space-conscious applications. To control the IC, no other external current is needed for the shutdown pin. It typically consumes less than 1A of full supply range. Applications STN/TFT LCD Bias Personal Digital Assistants (PDAs) Handheld Computers Digital Still Cameras Cellular Phones Web Pad Ordering Information ORDER NUMBER G5122T11U ORDER NUMBER (Pb free) G5122T11Uf MARKING 5122x TEMP. RANGE -40C ~ +85C PACKAGE SOT-23-5 Pin Configuration Typical Application Circuit VIN 2.5V to 4.2V SW 1 5 VCC 4.7F GND 2 10H 0.1F 10H -28V VCC SW 316k * 47PF 10F G5122 G963 4 SHDN G5122 SHDN GND FB 15k FBN 3 SOT23-5 * option Ver: 0.2 Preliminary Mar 21, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. Absolute Maximum Ratings SW to GND.........................................-0.3V to +33V FBN to GND............... ........................ -VCC to +0.3V VCC, SHDN to GND.....................................-0.3V to +7V Operating Temperature Range (Note 1) ..-40C to +85C G5122 Junction Temperature ........................................+125C Storage Temperature......................... -65C to +150C Reflow Temperature (Soldering, 10 sec)..............260C Stress beyond those listed under "Absolute Maximum Rating" may cause permanent damage to the device. Electrical Characteristics (VCC = 3.6V, V SHDN = 3.6V, TA = 25C) PARAMETER Input Voltage Range Quiescent Current FBN Comparator Trip Point Output Voltage Line Regulation FBN Pin Bias Current (Note 2) Switch Off Time Switch RDS(ON) Switch Current Limit SHDN Pin Current CONDITIONS Not Switching V SHDN = 0V 2.5V 2.5 -----1.18 --------300 --0.9 --- TYP --20 0.1 -1.2 -0.05 -1.6 500 0.8 350 0.1 ----0.01 1.9 MAX 6.5 35 1 -1.22 ---2.4 --1 400 1 --0.25 5 --- UNITS V A A V %/V A ns mA A V V A V SHDN Input Voltage High SHDN Input Voltage Low Switch Leakage Current Input Voltage UVLO Switch Off, VSW = 33V ----- Note 1: The G5122 are guaranteed to meet performance specifications from 0C to 85C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 2: Bias current flows into the FBN pin. Block Diagram L1 VIN C1 VCC SHDN SW D1 C2 C3 L2 D2 VOUT BIAS VOUT SHUTDOWN LOGIC UVLO R1 ERROR COMP FB en_sw + PUMP CONTROL OC DRIVER COMP + R2 TOFF PULSE CONTROL -1.2V VREF GND Ver: 0.2 Preliminary Mar 21, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 2 Global Mixed-mode Technology Inc. Typical Performance Characteristics (VCC=+3.6V, V SHDN =+3.6V, L=10H, TA=25C, unless otherwise noted.) G5122 Load Transient Line Transient Output Voltage vs. Input Voltage -27 IOUT=10mA Output Voltage (V) Output Voltage (V) -27.5 -27.5 -27 Output Voltage vs. Load Current VOUT=-28.5V -28 -28 -28.5 -28.5 -29 2 2.5 3 3.5 4 4.5 Input Voltage (V) 5 5.5 6 -29 1 2 3 4 5 6 7 8 9 10 Load Current (mA) Quiescent Current vs. Temperature 25 VCC=4.2V Switch Vds_on (mV) 250 Vds_on vs. Temperature 20 Quiescent Current (A) 200 VCC=2.7V 150 15 VCC=2.7V 10 VCC=3.6V 100 VCC=4.2V VCC=3.6V 5 50 0 -40 -20 0 20 40 60 Temperature (C) 80 100 0 -40 -20 0 20 40 60 Temperature (C) 80 100 Ver: 0.2 Preliminary Mar 21, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 3 Global Mixed-mode Technology Inc. Typical Performance Characteristics (Continued) G5122 Feedback Bias Current vs. Temperature 3 Feedback Voltage vs. Temperature -1.18 Feedback Bias Current (nA) -40 -20 0 20 40 60 Temperature (C) 80 100 2.5 2 1.5 1 0.5 0 -40 -20 0 20 40 60 Temperature (C) 80 100 Feedback Voltage (V) -1.19 -1.2 -1.21 -1.22 Crrent Limit vs. Temperature 450 100 90 400 Peak Crrent (mA) Efficiency (%) VCC=4.2V 350 80 70 60 50 40 30 20 10 250 -40 -20 0 20 40 60 Temperature (C) 80 100 0 0.1 Efficiency vs. Load Current VCC=4.2V VCC=3.6V VCC=2.7V 300 VCC=2.7V VCC=3.6V 1 10 Load Current (mA) 100 Recommended Minimum Footprint SOT-23-5 Ver: 0.2 Preliminary Mar 21, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 4 Global Mixed-mode Technology Inc. Pin Description PIN 1 2 3 4 5 G5122 NAME SW GND FBN SHDN FUNCTION Switch Pin. The drain of the internal NMOS power switch. Connect this pin to inductor. Ground. Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Block Diagram): |VOUT| - 1.2 R1 = 1.2/R2 + (1.6x10-6) Active-Low Shutdown Pin. Tie this pin to logic-high to enable the device or tied it to logic-low to turn this device off. Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. VCC Ver: 0.2 Preliminary Mar 21, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 5 Global Mixed-mode Technology Inc. Package Information G5122 D C L E H 1 e1 e A A2 A1 b Note: 1. Package body sizes exclude mold flash protrusions or gate burrs 2. Tolerance 0.1000 mm (4mil) unless otherwise specified 3. Coplanarity: 0.1000mm 4. Dimension L is measured in gage plane DIMENSIONS IN MILLIMETERS MIN A A1 A2 b C D E e e1 H L 1 1.00 0.00 0.70 0.35 0.10 2.70 1.40 --------2.60 0.37 1 SYMBOLS NOM 1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.95 2.80 -----5 MAX 1.30 0.10 0.90 0.50 0.25 3.10 1.80 --------3.00 ----9 Taping Specification PACKAGE SOT-23-5 Q'TY/REEL 3,000 ea Feed Direction SOT-23-5 Package Orientation GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications. Ver: 0.2 Preliminary Mar 21, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 5 |
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