MAX1630AMAX1635A 19-3518 Rev 1 8/05 Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers General Description Features 96% Efficiency The MAX1630AMAX1635A are buck-topology, step- down, switch-mode, power-supply controllers that gener- +4.2V to +30V Input Range ate logic-supply voltages in battery-powered systems. 2.5V to 5.5V Dual Adjustable Outputs These high-performance, dual-/triple-output devices Selectable 3.3V and 5V Fixed or Adjustable include on-board power-up sequencing, power-good Outputs (Dual Mode) signaling with delay, digital soft-start, secondary winding 12V Linear Regulator control, low-dropout circuitry, internal frequency-com- Adjustable Secondary Feedback pensation networks, and automatic bootstrapping. (MAX1631A/MAX1634A) Up to 96% efficiency is achieved through synchronous 5V/50mA Linear Regulator Output rectification and Maxims proprietary Idle Mode control Precision 2.5V Reference Output scheme. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system- Programmable Power-Up Sequencing suspend or standby mode. Excellent dynamic response Power-Good (RESET) Output corrects output load transients caused by the latest Output Overvoltage Protection dynamic-clock CPUs within five 300kHz clock cycles. (MAX1630A/MAX1631A/MAX1632A) Strong 1A on-board gate drivers ensure fast external Output Undervoltage Shutdown n-channel MOSFET switching. (MAX1630A/MAX1631A/MAX1632A) These devices feature a logic-controlled and synchroniz- 200kHz/300kHz Low-Noise, Fixed-Frequency able, fixed-frequency, pulse-width-modulation (PWM) Operation operating mode. This reduces noise and RF interference Low-Dropout, 99% Duty-Factor Operation in sensitive mobile communications and pen-entry appli- 2.5mW Typical Quiescent Power (+12V Input, cations. Asserting the SKIP pin enables fixed-frequency Both SMPSs On) mode for lowest noise under all load conditions. 4A Typical Shutdown Current The MAX1630AMAX1635A include two PWM regulators, 28-Pin SSOP Package adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V modes. All these devices include secondary feedback Ordering Information regulation, and the MAX1630A/MAX1632A/MAX1633A/ MAX1635A each contain 12V/120mA linear regulators. PART TEMP RANGE PIN-PACKAGE The MAX1631A/MAX1634A include a secondary feed- MAX1630AEAI -40C to +85C 28 SSOP back input (SECFB), plus a control pin (STEER) that +Denotes lead-free package. selects which PWM (3.3V or 5V) receives the secondary feedback signal. SECFB provides a method for adjusting Ordering Information continued at end of data sheet. the secondary winding voltage regulation point with an Functional Diagram external resistor-divider, and is intended to aid in creating auxiliary voltages other than fixed 12V. INPUT The MAX1630A/MAX1631A/MAX1632A contain internal output overvoltage and undervoltage protection features. +5V (RTC) +12V The MAX1630A family has improved RF immunity over 5V 12V the MAX1630 family. LINEAR LINEAR Applications Notebook and Subnotebook Computers +3.3V +5V 3.3V 5V SMPS SMPS PDAs and Mobile Communicators Desktop CPU Local DC-DC Converters Pin Configurations and Selector Guide appear at end of data ON/OFF POWER-UP POWER- RESET sheet. SEQUENCE GOOD Idle Mode and Dual Mode are trademarks of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEMulti-Output, Low-Noise Power-Supply Controllers for Notebook Computers ABSOLUTE MAXIMUM RATINGS V+ to GND..............................................................-0.3V to +36V VL, REF Short to GND ................................................Momentary PGND to GND.....................................................................0.3V 12OUT Short to GND..................................................Continuous VL to GND ................................................................-0.3V to +6V REF Current...........................................................+5mA to -1mA BST3, BST5 to GND ...............................................-0.3V to +36V VL Current.........................................................................+50mA LX3 to BST3..............................................................-6V to +0.3V 12OUT Current ...............................................................+200mA LX5 to BST5..............................................................-6V to +0.3V V Shunt Current............................................................+15mA DD REF, SYNC, SEQ, STEER, SKIP, TIME/ON5, Operating Temperature Ranges SECFB, RESET to GND .......................................-0.3V to +6V MAX163 ACAI ....................................................0C to +70C V to GND............................................................-0.3V to +20V MAX163 AEAI .................................................-40C to +85C DD RUN/ON3, SHDN to GND.............................-0.3V to (V+ + 0.3V) Storage Temperature Range .............................-65C to +160C 12OUT to GND ...........................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) DD A DL3, DL5 to PGND........................................-0.3V to (VL + 0.3V) SSOP (derate 9.52mW/C above +70C) ....................762mW DH3 to LX3 ...............................................-0.3V to (BST3 + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DH5 to LX5 ...............................................-0.3V to (BST5 + 0.3V) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, SKIP = 0V, T = T to T , unless otherwise noted. A MIN MAX Typical values are at T = +25C.) A PARAMETER CONDITIONS MIN TYP MAX UNITS MAIN SMPS CONTROLLERS Input Voltage Range 4.2 30.0 V 3V Output Voltage in V+ = 4.2V to 30V, CSH3CSL3 = 0V, 2.42 2.5 2.58 V CSL3 tied to FB3 Adjustable Mode V+ = 4.2V to 30V, 0mV < CSH3CSL3 < 80mV, 3V Output Voltage in Fixed Mode 3.20 3.39 3.47 V FB3 = 0V 5V Output Voltage in V+ = 4.2V to 30V, CSH5CSL5 = 0V, 2.42 2.5 2.58 V CSL5 tied to FB5 Adjustable Mode V+ = 5.2V to 30V, 0mV < CSHCSL5 < 80mV, 5V Output Voltage in Fixed Mode 4.85 5.13 5.25 V FB5 = 0V Output Voltage Adjust Range Either SMPS REF 5.5 V Adjustable-Mode Threshold Voltage Dual Mode comparator 0.5 1.1 V Load Regulation Either SMPS, 0V < CSH - CSL < 80mV -2 % Line Regulation Either SMPS, 5.2V < V+ < 30V 0.03 %/V CSH3CSL3 or CSH5CSL5 80 100 120 Current-Limit Threshold mV SKIP = VL or V < 13V or SECFB < 2.44V -50 -100 -150 DD Idle Mode Threshold SKIP = 0V, not tested 10 25 40 mV From enable to 95% full current limit with respect to Soft-Start Ramp Time 512 Clks f (Note 1) OSC SYNC = VL 270 300 330 Oscillator Frequency kHz SYNC = 0V 170 200 230 SYNC = VL 97 98 Maximum Duty Factor % SYNC = 0V (Note 2) 98 99 2 MAX1630AMAX1635A