MAX17085B 19-5135 Rev 2 3/12 Integrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators General Description Features The MAX17085B is an all-in-one notebook power solution S All-in-One Charger Plus Dual Main Step-Down integrating a multichemistry battery charger, dual fixed- Controllers output Quick-PWMK step-down controllers, and dual S 5V/100mA and 3.3V/50mA LDO Regulators keep-alive linear regulators: S Main Charger: The high-frequency (~1.4MHz) multichem- Dual Quick-PWM with Fast Transient Response istry battery charger uses a current-mode, fixed and Extended On-Time inductor current ripple architecture that significantly 300kHz to 800kHz Switching Frequency reduces component size and cost. Low-offset sense Fixed 5V and 3.3V SMPS Outputs amplifiers allow the use of low-value sense resistors Low-Noise Ultrasonic Mode for charging and input current limit. Autoretry Fault Protection The charger uses n-channel switching MOSFETs. S Charger Adjustable charge current, charge voltage, and cell High Switching Frequency (1.4MHz) selection allow for flexible use with different battery Selectable 2-, 3-, and 4-Cell Battery Voltage packs. Charge current is set by an analog control input, Automatic Selection of System Power Source or a PWM input. High-accuracy current-sense ampli- Internal Charge-Pump for Adapter n-Channel fiers provide fast cycle-by-cycle current-mode control to MOSFETs Drive protect against short circuits to the battery and respond Q0.4% Accurate Charge Voltage quickly to system load transients. Additionally, the char- Q2.5% Accurate Input Current Limiting ger provides a high-accuracy analog output that is pro- Q3% Accurate Charge Current portional to the adapter current. S Monitor Outputs for An integrated charge pump controls an n-channel AC Adapter Current (Q2% Accuracy) adapter selector switch. The charge pump remains Battery Discharge Current (Q2% Accuracy) active even when the charger is off. When the adapter AC Adapter OK is absent, a p-channel MOSFET selects the battery. S Analog/PWM (100Hz to 500kHz) Adjustable Main SMPS: The dual Quick-PWM step-down con- Charge Current Setting trollers with synchronous rectification generate S AC Adapter Overvoltage and Overcurrent the 5V and 3.3V main power in a notebook. Low- Protection side MOSFET sensing provides a simple low-cost, highly efficient valley current-limit protection. The Applications MAX17085B also includes output undervoltage, out- Notebook Computers put overvoltage, and thermal-fault protection. PDAs and Mobile Communicators Separate enable inputs for each SMPS and a com- bined open-drain power-good output allow flex- 5V and 3.3V Supplies ible power sequencing. Voltage soft-start reduces 2-to-4, Li+-Cell, Battery-Powered Devices inrush current, while passive shutdown discharges the output through an internal switch. Fast transient Ordering Information response, with an extended on-time feature reduces output capacitance requirements. Selectable pulse- PART TEMP RANGE PIN-PACKAGE skipping mode and ultrasonic mode improve light- MAX17085BETL+ -40C to +85C 40 TQFN-EP* load efficiency. Ultrasonic mode operation maintains +Denotes a lead(Pb)-free/RoHS-compliant package. a minimum switching frequency at light loads, mini- *EP = Exposed pad. mizing audible noise effects. Dual LDO Regulators: An internal 5V/100mA LDO5 with switchover can be used to either generate the 5V bias Pin Configuration appears at end of data sheet. needed for power-up or other lower power always-on suspend supplies. Another 3.3V/50mA LDO3 provides always-on power to a system microcontroller. Quick-PWM is a trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEIntegrated Charger, Dual Main Step-Down Controllers, and Dual LDO Regulators ABSOLUTE MAXIMUM RATINGS (Note 1) TON, DCIN, CSSP, BATT, CSIP to GND, DHC to LXC ...........................................-0.3V to (V + 0.3V) BSTC LX to GND ........................................................-0.3V to +28V PDSL to GND .......................................................-0.3V to + 36V CSIP to CSIN, CSSP to CSSN ..............................-0.3V to +0.3V BSTC to LXC ...........................................................-0.3V to +6V LDO3, LDO5, VCC to GND (Note 2) .......................-0.3V to +6V CELLS, CC, IINP to GND ......................-0.3V to (V + 0.3V) LDO5 ISET, VCTL, ACIN, ACOK to GND ..........................-0.3V to +6V LDO Short Circuit to GND .......................................Momentary OUT3, OUT5 to GND (Note 2) ................................-0.3V to +6V LDO5 Current (Internal Regulator) Continuous ............. +100mA ON3, ON5, PGOOD to GND ...................................-0.3V to +6V LDO3 Current (Internal Regulator) Continuous ............... +50mA ILIM3, ILIM5, SKIP, REF to GND .............. -0.3V to (V + 0.3V) LDO Current (Switched Over) Continuous .................. +200mA CC GND to EP ............................................................-0.3V to +0.3V Continuous Power Dissipation (T = +70NC) A DL to EP ...............................................-0.3V to (V + 0.3V) 40-Pin Thin QFN (derate 34.5mW/NC above +70NC) 2857mW LDO5 BST to GND .........................................................-0.3V to +34V Operating Temperature Range .......................... -40NC to +85NC BST to LDO5 ........................................................-0.3V to +28V Junction Temperature .....................................................+150NC DH3 to LX3 ............................................ -0.3V to (V + 0.3V) Storage Temperature Range ............................ -65NC to +150NC BST3 BST3 to LX3 .............................................................-0.3V to +6V Lead Temperature (soldering, 10s) ................................+300NC DH5 to LX5 ............................................ -0.3V to (V + 0.3V) Soldering Temperature (reflow) ......................................+260NC BST5 BST5 to LX5 .............................................................-0.3V to +6V Note 1: Absolute Maximum Ratings valid using 20MHz bandwidth limit. Note 2: LDO5 has a weak leakage to V when LDO5 is more than 0.5V above V . OUT5 has a weak leakage to V when CC CC CC OUT5 is more than 0.5V above V . CC 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 (Circuit of Figure 1, no load on LDO5, LDO3, OUT5, OUT3, and REF, V = 5V, ON3 = ON5 = V , V = V = V = V CC CC DCIN LXC CSSP CSSN = 19V, V - V = 5V, V = V = V = 12.6V, V = V = 1.8V, CELLS = open, T = 0C to +85C, unless oth- BSTC LXC BATT CSIP CSIN VCTL ISET A erwise noted. Typical values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLIES Charging 3 6 I + I + I , DCIN CSSP CSSN enabled Adapter Present Quiescent ON3 = ON5 = SKIP = V , mA CC Current Charging V = 3.5V, V = 5.3V OUT3 OUT5 1.5 2.5 disabled V = 2.4V, I + I + I , ISET DCIN CSSP CSSN 1.5 2.5 Adapter Absent Quiescent IINP ON ON3 = ON5 = SKIP = V , mA CC Current V = 3.5V, V = 5.3V OUT3 OUT5 ISET = GND 1.2 2.2 CSSN Input Current V = V = 24V, T = +25C 0.1 2 FA CSSP CSSN A V = 16.8V, adapter absent, T = +25C 4 BATT + CSIP + CSIN + LXC BATT A FA Input Current V = 2V to 19V, adapter present 200 650 BATT ON3 = ON5 = SKIP = V , charger CC DCIN Input Current I 0.1 0.2 mA DCIN disabled V = 3.5V, V = 5.3V OUT3 OUT5 DCIN Standby Supply Current V = 5V to 24V, ON3 = ON5 = GND 130 270 FA DCIN ON3 = ON5 = SKIP = V , charger CC V Supply Current I 1.0 1.5 mA CC CC disabled V = 3.5V, V = 5.3V OUT3 OUT5 Note: LDO5 is NOT guaranteed to be in DCIN Input Voltage Range 4.5 24 V regulation until DCIN is above 6V. 2 MAX17085B