MAX786EAI Maxim Integrated Products, MAX786EAI Datasheet
MAX786EAI
Specifications of MAX786EAI
Available stocks
Related parts for MAX786EAI
MAX786EAI Summary of contents
Page 1
... LOW-BATTERY WARNING SYNC SUSPEND POWER Idle Mode is a trademark of Maxim Integrated Products. Pentium is a trademark of Intel Corp. PowerPC is a trademark of IBM Corp. _______________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. ...
Page 2
... VL Current ..........................................................................50mA Continuous Power Dissipation (T SSOP (derate 9.52mW/°C above +70°C)....................762mW Operating Temperature Ranges MAX786CAI/MAX786_CAI .................................0°C to +70°C MAX786EAI/MAX786_EAI ...............................-40°C to +85°C Lead Temperature (soldering, 10sec) ............................+300°C = 0mA, SHDN = ON3 = ON5 = 5V, other digital input levels are 0V or +5V, CONDITIONS MAX786 ...
Page 3
Controller for Notebook Computers ELECTRICAL CHARACTERISTICS (continued) (V+ = 15V, GND = PGND = 0V REF unless otherwise noted.) A MIN MAX PARAMETER Q1, Q2 Source Current VH = 15V, ...
Page 4
Dual-Output Power-Supply Controller for Notebook Computers ________________________________________________Typical Operating Characteristics (Circuit of Figure +25°C, unless otherwise noted.) A EFFICIENCY vs. +5V OUTPUT CURRENT, 200kHz 100 15V 30V ...
Page 5
Controller for Notebook Computers _________________________________Typical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted.) A IDLE MODE WAVEFORMS 200 s/div I = 100mA LOAD V = 10V IN +5V LOAD-TRANSIENT RESPONSE 200 s/div V = 15V ...
Page 6
Dual-Output Power-Supply Controller for Notebook Computers _________________________________Typical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted.) A +5V LINE-TRANSIENT RESPONSE, RISING 20 s/div LOAD +3.3V LINE-TRANSIENT RESPONSE, RISING 20 s/div ...
Page 7
Controller for Notebook Computers _______________________________________________________________________Pin Description PIN NAME 1 CS3 Current-sense input for +3.3V; +100mV = current limit level referenced to FB3. 2 SS3 Soft-start input for +3.3V. Ramp time to full current limit is 1ms/nF of capacitance to GND. ...
Page 8
Dual-Output Power-Supply Controller for Notebook Computers _________________Detailed Description The MAX786 converts a 5.5V to 30V input to four outputs (Figure 1). It produces two high-power, PWM, switch- mode supplies, one at +5V and the other at +3.3V. The two supplies ...
Page 9
Controller for Notebook Computers A synchronous rectifier at LX3 keeps efficiency high by clamping the voltage across the rectifier diode. Maximum current limit is set by an external low-value sense resistor, which prevents excessive inductor cur- rent during start-up or ...
Page 10
Dual-Output Power-Supply Controller for Notebook Computers +5V Switch-Mode Supply The +5V output is produced by a current-mode, PWM step-down regulator, which is nearly identical to the +3.3V supply. The +5V supply’s dropout voltage, as configured in Figure 1, is typically ...
Page 11
Controller for Notebook Computers second half-cycle, the PWM turns on the high-side MOSFET by connecting the capacitor to the MOSFET gate by closing an internal switch between BST_ and DH_. This provides the necessary enhancement voltage to turn on the ...
Page 12
Dual-Output Power-Supply Controller for Notebook Computers Modes of Operation Under heavy loads—over approximately 25% of full load — the +3.3V and +5V supplies operate as continuous- current PWM supplies (see Typical Operating Char- acteristics ). The duty cycle (%ON) is ...
Page 13
Controller for Notebook Computers Table 1. Surface-Mount Components (See Figure 1 for Standard Application Circuit.) COMPONENT SPECIFICATION C1, C10 33µF, 35V tantalum capacitors C2 4.7µF, 6V tantalum capacitor C3 1µF, 20V tantalum capacitor C4, C5 0.1µF, 16V ceramic capacitors C6 ...
Page 14
Dual-Output Power-Supply Controller for Notebook Computers V , the maximum input (battery) voltage. This IN(MAX) value should include the worst-case conditions under which the power supply is expected to function, such as no-load (standby) operation when a battery charger is ...
Page 15
Controller for Notebook Computers Be sure to select output capacitors that satisfy both the minimum capacitance and maximum ESR require- ments. To achieve the low ESR required, it may be appropriate to use a capacitance value times ...
Page 16
Dual-Output Power-Supply Controller for Notebook Computers Table 3. EV Kit Power-Supply Controls (SW1) SWITCH NAME FUNCTION Enable shutdown 1 SHDN mode Enable 3.3V 2 ON3 power supply Enable 5.0V 3 ON5 power supply 4 SYNC Oscillator ...
Page 17
Controller for Notebook Computers _________________EV Kit Information The MAX786 evaluation kit (EV kit) embodies the standard application circuit, with some extra pull- up and pull-down resistors needed to set default logic signal levels. The board comes configured to accept battery ...
Page 18
Dual-Output Power-Supply Controller for Notebook Computers Figure 10. MAX786 EV Kit, Bottom Component Layout and Silk Screen, Bottom View Figure 11. MAX786 EV Kit, Bottom Layer (Layer 4), Top View 18 ______________________________________________________________________________________ 1.0" 1.0" ...
Page 19
Controller for Notebook Computers ______________________Chip Topography SS3 CS3 FB3 DH3 ON3 GND REF SYNC DH5 ON5 CS5 SHDN SS5 0.109" (2.769mm) TRANSISTOR COUNT: 1294 SUBSTRATE CONNECTED TO GND ______________________________________________________________________________________ Dual-Output Power-Supply LX3 BST3 DL3 V+ ...
Page 20
... Dual-Output Power-Supply Controller for Notebook Computers __Ordering Information (continued) PART TEMP. RANGE PIN-PACKAGE MAX786SCAI 0°C to +70°C MAX786C/D 0°C to +70°C MAX786EAI -40°C to +85°C MAX786REAI -40°C to +85°C MAX786SEAI -40°C to +85°C EV KIT TEMP. RANGE MAX786EVKIT-SO 0°C to +70°C *Contact factory for dice specifications. ...