ACT8309 ACTIVE-SEMI | Alldatasheet

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Innovative Products. Active Solutions. - 1 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. ACT8309/8310/8311 1.5A, PWM Step-Down DC/DCs in TDFN SYSTEM BLOCK DIAGRAM

FEATURES

  • Multiple Patents Pending
  • Up to 95% High Efficiency
  • Up to 1.5A Guaranteed Output Current (ACT8311)
  • 1.35MHz Constant Frequency Operation
  • Internal Synchronous Rectifier Eliminates Schottky Diode
  • ACT8309: Up to 900mA
  • ACT8310: Up to 1.2A
  • ACT8311: Up to 1.5A
  • 100% Duty Cycle Low-Dropout Operation
  • 0.1µA Shutdown Current
  • Small TDFN33-8 Package − RoHS-Compliant
  • Independent Enable/Disable Control
  • Minimal External Components

APPLICATIONS

  • Wireless Handhelds
  • Portable Devices
  • GPS/PND equipment GENERAL DESCRIPTION The patent-pending ACT8309/ACT8310/ACT8311 are current-mode, fixed-fr equency PWM, synchro- nous step-down DC/DC converters that are capable of delivering 1.5A with efficiency of up to 95%. These devices operate with a fixed frequency of 1.35MHz, minimizing noise in sensitive equipment as well as optimizing both efficiency and component size and cost. These devices feature ve ry low-resistance power MOSFET and 100% duty cycle operation, making them ideal choices for portable applications requir- ing a 3.0V or 3.3V rail to be generated from a Li+ battery. The ACT8311 is capable of supplying up to 1.5A of output current, while the ACT8309 and ACT8310 are capable of supplying up to 900mA and 1.2A, respectively. All three devices have adjustable out- put voltages that are programmable down to 1.2V. Contact Active-Semi for custom fixed output voltage availability. Rev PrA, 24-Jan-08 Advanced Product Information – All Information Subject to Change Pb-free Active- Semi ACT8311 IN SW FB G VOUT Up to 1.5A EN ON OFF POK GP 2.7V to 5.0V Power-OK Output Active- Semi

Rev PrA, 24-Jan-08 Active- Semi Innovative Products. Active Solutions. - 2 - www.active-semi.com Copyright © 2008 Active-Semi, Inc.

ORDERING INFORMATION

CURRENT PACKAGE PINS TEMPERATURE RANGE ACT8309NHADJ-T TDFN33-8 8 -40°C to +85°C ACT8309NHxyz-T 0.9A TDFN33-8 8 -40°C to +85°C ACT8310NHADJ-T 1.2A TDFN33-8 8 -40°C to +85°C 0.9A OUTPUT VOLTAGE Adjustable 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.3Vc Adjustable ACT8310NHxyz-T 1.2A 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.3Vc TDFN33-8 8 -40°C to +85°C ACT8311NHADJ-T 1.5A Adjustable TDFN33-8 8 -40°C to +85°C ACT8311NHxyz-T 1.5A 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.3Vc TDFN33-8 8 -40°C to +85°C PIN CONFIGURATION PIN DESCRIPTIONS TDFN33-8 PIN NAME DESCRIPTION 1, 3 IN Power Input. Bypass to GP close to IC with a high quality ceramic capacitor. 2 GP Power Ground. Connect to G with a short trace. 4 G Analog Ground. Connect to GP with a short trace. 5 FB Feedback Node. For fixed output voltage versions, connect this pin directly to the output. For the adjustable output versions the voltage at this pin is regulated to 0.8V, connect to this pin to the center of the output feedback resistor divider for voltage setting.

6 POK

Open-Drain Power-OK Status Output. POK is an open-drain output which sinks current when the output voltage is less than 95% of the normal value. When the IC is disabled, POK is high impedance. 7 EN Enable Input. When higher than 1.4V, this pin turns the IC on. When lower than 0.4V, this pin turn the IC off. 8 SW Switch Output. Connect this pin to the switching end of the inductor. ACT8309 ACT8310 ACT8311 IN GP G IN SW POK FB EN c: Fixed output voltage options are available for production subject to minimum order quantities. Contact Active-Semi for more informa- tion regarding fixed output voltage options.

Rev PrA, 24-Jan-08 Active- Semi Innovative Products. Active Solutions. - 3 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. c: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rati ng conditions for long periods m ay affect device reliability. PARAMETER UNIT IN, SW to GP V FB, EN, POK to G V FB, EN, SW Voltage V GP to G V Continuous SW Current A Junction to Ambient Thermal Resistance (θJA) °C/W Maximum Power Dissipation (derate 5.3mW/°C above TA = 50°C) W Operating Junction Temperature °C Storage Temperature °C Lead Temperature (Soldering, 10 sec) °C VALUE -0.3 to +5.5 -0.3 to +5.5 -0.3 to VIN + 0.3 -0.3 to +0.3 Internally limited 1.63 -40 to 150 -55 to 150 300 ABSOLUTE MAXIMUM RATINGSc

Rev PrA, 24-Jan-08 Active- Semi Innovative Products. Active Solutions. - 4 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. PARAMETER SYMBOL TEST COND ITIONS MIN TYP MAX UNIT Input Voltage Range V IN 2.7 5.0 V Under Voltage Lockout Threshold V UVLO V IN rising, hysteresis = 80mV 2.35 2.5 2.6 V Standby Supply Current V FB = 103%VFB,TYP, IOUT = 0 150 310 µA Shutdown Supply Current EN = G, V IN = 4.2V 0.1 1 µA FB Voltage V FB TA = 25°C 0.786 0.80 0.814 V -40°C < TA < 85°C 0.776 0.80 0.824 Output Voltage Accuracy TA = 25°C -2% V NOM +2% V -40°C < TA < 85°C -3% V NOM +3% Output Voltage Line Regulation 0.06 0.4 %/V Output Voltage Load Regulation 0.6 % Current Limit ACT8309NH 1.1 1.3 1.8 A ACT8310NH 1.4 1.7 2.2 ACT8311NH 1.75 2.1 2.8 Max Output Current ACT8309NH 0.9 A ACT8310NH 1.2 ACT8311NH 1.5 Oscillator Frequency f SW VOUT = 80% of VOUT,NOM 1.05 1.35 1.6 MHz VFB = 0.1V 450 kHz PMOS On-Resistance R ONP ACT8309, ISW = -100mA 0.15 0.234 ACT8310, ISW = -100mA 0.12 0.192 ACT8311, ISW = -100mA 0.10 0.165 NMOS On-Resistance R ONN I SW = 100mA 0.15 0.26 Ω EN Logic High Threshold V IH V IN = 2.7V to 5.0V 1.4 V EN Logic Low Threshold V IL V IN = 2.7V to 5.0V 0.4 V EN Input Bias Current I EN V IN = 5.0V, EN = G or IN 0.01 0.1 µA POK Threshold % of V OUT,NOM 95 % POK Output Low Voltage V OL I POK = 100µA 0.008 0.012 V POK Leakage Current I POK V POK = 5.0V 0.01 0.1 µA Ω

ELECTRICAL CHARACTERISTICS

(VIN = VEN = 3.6V, TA = 25˚C, unless otherwise specified.)

Rev PrA, 24-Jan-08 Active- Semi Innovative Products. Active Solutions. - 5 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. ACT8311 IN SW FB G 3.0V Up to 1.5A EN IN POK GP 2.7V to 5.0V OUT 100k? 3.3µH 22µF549k? 200k? OUT10µF Figure1: Functional Block Diagram GATE DRIVER SWPWM CONTROL EN IN IN GP FB POK G ACT8309 ACT8310 ACT8311 OUT OUT Figure 2: Typical Application Circuit Active- Semi Active- Semi 549kΩ 200kΩ 100kΩ

Rev PrA, 24-Jan-08 Active- Semi Innovative Products. Active Solutions. - 7 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. a logic-level “Power-OK” signal, simply connect a pull- up resistor from POK to an appropriate output volt- age. PCB Layout Considerations High switching frequencies and large peak current make PC board layout an important part of step- down DC/DC converter design. A good design mini- mizes excessive EMI on the feedback paths and volt- age gradients in the ground plane, both of which can result in instability or regulation errors. Step-down DC/DCs exhibit discontinuous input current, so the input capacitors should be placed as close as possi- ble to the IC, and avoiding the use of vias if possible. The inductor, input filter c apacitor, and output filter capacitor should be connected as close together as possible, with short, direct, and wide traces. The ground nodes for each regulator’s power loop should be connected at a single point in a star-ground con- figuration, and this point should be connected to the backside ground plane with multiple vias. For fixed output voltage options the output node for each regu- lator should be connected to its corresponding FB pin through the shortest possible route, while keeping sufficient distance from switching nodes to prevent noise injection. Adjustable output versions should follow the same guidelines, but additionally connect the feedback resistors to the FB pin as close to the IC as possible to minimize noise injection.

Rev PrA, 24-Jan-08 Active- Semi Innovative Products. Active Solutions. - 8 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. 0 200 400 600 800 1200 1000 900 800 700 600 500 400 300 200 100 0 TYPICAL PERFORMANCE CHARACTERISTICS (VIN = VEN = 3.6V, TA = 25°C, unless otherwise specified.) ACT8309 Efficiency vs. Load Current Load Current (mA) Dropout Voltage (mV) Load Current (mA) ACT8309 Dropout Voltage vs. Load Current ACT8309/8310/8311-002 ACT8310 Efficiency vs. Load Current Efficiency (%) Load Current (mA) ACT8309/8310/8311-003 160 180 10 100 1000 10 100 1000 140 120 100 Efficiency (%) ACT8311 Efficiency vs. Load Current Efficiency (%) Load Current (mA) ACT8309/8310/8311-005 1 10 100 1000 200 ACT8309/8310/8311-001 VOUT = 3.3V VOUT = 3.0V Dropout Voltage (mV) Load Current (mA) ACT8310 Dropout Voltage vs. Load Current ACT8309/8310/8311-004 160 180 140 120 100 200 VOUT = 3.3V VOUT = 3.0V Dropout Voltage (mV) Load Current (mA) ACT8311 Dropout Voltage vs. Load Current ACT8309/8310/8311-006 160 180 140 120 100 200 VOUT = 3.3V VOUT = 3.0V 220 1.4 1.5 10000 10000 10000 100 VIN = 3.6V VIN = 3.6V VIN = 3.6V VOUT = 3.3V VOUT = 3.0V VOUT = 1.8V VOUT = 1.2V VOUT = 3.3V VOUT = 3.0V VOUT = 1.8V VOUT = 1.2V VOUT = 3.3V VOUT = 3.0V VOUT = 1.8V VOUT = 1.2V 100 100

Rev PrA, 24-Jan-08 Active- Semi Innovative Products. Active Solutions. - 9 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. TYPICAL PERFORMANCE CHARACTERISTICS (VIN = VEN = 3.6V, TA = 25°C, unless otherwise specified.) ACT8309/8310/8311-007 CH1: VOUT, 1.0V/div CH2: POK, 2.0V/div TIME: 100µs ACT8309/8310/8311-008 Startup Waveform CH1 CH2 VOUT = 3.3V Load Transient Response CH1: VOUT, 100mV/div (AC COUPLED) CH2: Load Current (100mA to 1000mA) TIME: 100µs CH1 CH2 VIN = 4.2V VOUT = 3.3V VIN = 4.2V VOUT = 3.3V IOUT = 1A

Rev PrA, 24-Jan-08 Active- Semi Innovative Products. Active Solutions. - 10 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. PACKAGE OUTLINE Active-Semi, Inc. reserves the right to modify the circuitry or spec ifications without notice. Users should evaluate each produ ct to make sure that it is suitable for their applications. Active-Semi pr oducts are not intended or authorized for use as critical compon ents in life- support devices or systems. Active-Semi, Inc. does not assume an y liability arising out of the use of any product or circuit de scribed in this datasheet, nor does it convey any patent license. Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact sales@active- semi.com or visit http://www.active-semi.com. For other inquiries, please send to:

1270 Oakmead Parkway, Suite 310, Sunnyvale, California 94085-4044, USA

TDFN33-8 PACKAGE OUTLINE AND DIMENSIONS SYMBOL DIMENSION IN MILLIMETERS DIMENSION IN INCHES MIN MAX MIN MAX A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.153 0.006 D 2.900 3.100 0.114 0.122 E 2.900 0.114 D2 2.200 0.087 E2 0.055 b 0.200 0.320 0.008 0.013 e 0.650 TYP 0.026 TYP L 0.375 0.575 0.015 0.023 1.400 3.100 0.122 0.253 0.010 2.400 1.600 0.094 0.063