MAX17080GTL+ Maxim Integrated Products, MAX17080GTL+ Datasheet
MAX17080GTL+
Specifications of MAX17080GTL+
Related parts for MAX17080GTL+
MAX17080GTL+ Summary of contents
Page 1
... Outputs o System Power-OK (PGD_IN) Input o Overvoltage, Undervoltage, and Thermal-Fault Protection o Voltage Soft-Startup and Passive Shutdown o < 1µA Typical Shutdown Current PART MAX17080GTL+ + Denotes a lead(Pb)-free and RoHS-compliant package. VID Controller Features Accuracy over Line, Load, and OUT Ordering Information TEMP RANGE PIN-PACKAGE -40° ...
Page 2
AMD 2-/3-Output Mobile Serial VID Controller ABSOLUTE MAXIMUM RATINGS (Note AGND ..............................-0.3V to +6V DD, IN3, CC DDIO PWRGD to AGND .....................................................-0.3V to +6V SHDN to AGND ........................................................-0.3V to +6V GNDS1, GNDS2, THRM, ...
Page 3
ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V FBDC FBAC_ OUT3 CSP_ Typical values are +25°C.) A PARAMETER SYMBOL Shutdown ...
Page 4
... R Internal MOSFET On-Resistance R LX3 Peak Current Limit I LX3 Idle-Mode Trip Level I LX3 Zero-Crossing Trip Level Maximum Duty Factor Minimum On-Time t Idle Mode is a trademark of Maxim Integrated Products, Inc. 4 _______________________________________________________________________________________ = 5V, V SHDN DD IN3 PGD_IN = 1.2V, all DAC codes set to the 1.2V code, T ...
Page 5
ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V FBDC FBAC_ OUT3 CSP_ Typical values are +25°C.) A PARAMETER SYMBOL FAULT ...
Page 6
AMD 2-/3-Output Mobile Serial VID Controller ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V FBDC FBAC_ OUT3 CSP_ Typical values are at T ...
Page 7
ELECTRICAL CHARACTERISTICS (Circuit of Figure 12V FBDC_ FBAC_ OUT3 CSP_ noted. Typical values are +25°C.) (Note 5) A PARAMETER SYMBOL ...
Page 8
AMD 2-/3-Output Mobile Serial VID Controller ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V FBDC_ FBAC_ OUT3 CSP_ noted. Typical values are at T ...
Page 9
ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V FBDC_ FBAC_ OUT3 CSP_ noted. Typical values are +25°C.) (Note 5) A PARAMETER ...
Page 10
AMD 2-/3-Output Mobile Serial VID Controller ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 12V FBDC_ FBAC_ OUT3 CSP_ noted. Typical values are at T ...
Page 11
Circuit of Figure 12V CORE SMPS 1-PHASE EFFICIENCY vs. LOAD CURRENT (V = 1.2V) OUT 100 7V 90 12V 80 20V 70 SKIP MODE PWM MODE 60 0 ...
Page 12
AMD 2-/3-Output Mobile Serial VID Controller Circuit of Figure 12V MAXIMUM INDUCTOR CURRENT vs. INPUT VOLTAGE 1.2V OUT 29 27 PEAK CURRENT DC CURRENT ...
Page 13
Circuit of Figure 12V STARTUP WAVEFORMS 200µs/div V = 12V LOAD1 ...
Page 14
AMD 2-/3-Output Mobile Serial VID Controller Circuit of Figure 12V CORE SMPS 1-PH TRANSIENT PHASE REPEAT 1.2V 13.5A 1.5A 12V 0 2µs/div V = 12V I = 1.5A TO 13.5A ...
Page 15
Circuit of Figure 12V CORE SMPS OUTPUT OVERLOAD WAVEFORM (SEPARATE MODE 100µs/div V = 12V 40A ...
Page 16
AMD 2-/3-Output Mobile Serial VID Controller PIN NAME SMPS1 and SMPS2 Current-Limit Adjust Input. The positive current-limit threshold voltage is precisely 0.052 times the voltage between TIME and ILIM over a 0.2V to 1.0V range of V(TIME, 1 ILIM12 ILIM). ...
Page 17
PIN NAME SMPS2 Remote Ground-Sense Input. Normally connected to GND directly at the load. GNDS2 internally connects to a transconductance amplifier that fine tunes the output voltage— compensating for voltage drops from the SMPS ground to the load ground. 14 ...
Page 18
AMD 2-/3-Output Mobile Serial VID Controller PIN NAME Open-Drain Power-Good Output. PWRGD is the wired-OR open-drain output of all three SMPS outputs. PWRGD is forced high impedance whenever the slew-rate controller is active (output voltage transitions). During startup, PWRGD is ...
Page 19
PIN NAME Positive Current-Sense Input for SMPS1. Connect to the positive side of the output current-sensing 33 CSP1 resistor or the filtering capacitor if the DC resistance of the output inductor is utilized for current sensing. Negative Current-Sense Input for ...
Page 20
AMD 2-/3-Output Mobile Serial VID Controller PIN NAME Four-Level Input to Enable Offset and Change Core SMPS Address. OPTION 38 OPTION When OFFSET is enabled, the MAX17080 enables a fixed +12.5mV offset on SMPS1 and SMPS2 VID codes after PGD_IN ...
Page 21
Table 1. Component Selection for Standard Applications 24V, IN COMPONENT 1.0V TO OUT1 OUT2 1.3V, 18A PER PHASE Separate, 2-phase mobile Mode (GNDS1 = GNDS2 = low) Switching 300kHz Frequency (2) 10µF, ...
Page 22
AMD 2-/3-Output Mobile Serial VID Controller C VCC 2.2µF R OSC R ILIM1 R ILIM2 AGND 1.5V OR 1.8V SERIAL INPUT SYSTEM POWER-GOOD ON OFF SMPS1 SMPS2 OPTION OFFSET ADDR ADDR V 0 BIT1 (VDD0) BIT2 (VDD1) CC 3.3V 0 ...
Page 23
SHDN FAULT1 FAULT2 FAULT3 V CC REF (2.0V) AGND OFS_EN 7-BIT VID DAC1 SKIP1 ADDR PGD_IN 7-BIT VID DAC2 SKIP2 V DDIO SVC 7-BIT VID DAC3 SKIP3 SVD TIME GNDS2 GNDS1 x2 IMAX_ IMIN_ CURRENT ILIM12 CSA_ LIMIT REF SKIP_ ...
Page 24
AMD 2-/3-Output Mobile Serial VID Controller Detailed Description The MAX17080 consists of a dual fixed-frequency PWM controller with external switches that generate the sup- ply voltage for two independent CPU cores, and one low-input-voltage internal switch SMPS for the separate ...
Page 25
Transient Phase Repeat When a transient occurs, the output voltage deviation depends on the controller’s ability to quickly detect the transient and slew the inductor current. A fixed-frequency controller typically responds only when a clock edge occurs, resulting in a ...
Page 26
AMD 2-/3-Output Mobile Serial VID Controller where the differential current- CS CSP CSN sense voltage, and Gm is 2.06mS (max) as (FBAC) defined in the Electrical Characteristics table. AC droop is required for stable ...
Page 27
Nominal Output-Voltage Selection Core SMPS Output Voltage The nominal no-load output voltage (V each SMPS is defined by the selected voltage refer- ence (VID DAC) plus the remote ground-sense adjust- ment (V ) and the offset voltage (V GNDS defined ...
Page 28
AMD 2-/3-Output Mobile Serial VID Controller controller reaches the target output voltage. At the end of a downward VID transition, the upper PWRGD thresh- old is enabled only after the output reaches the lower VID code setting. Figure 5 shows ...
Page 29
SVC/SVD SMPS LOAD PWRGD UPPER THRESHOLD SMPS VOLTAGE (SMPS TARGET) PWRGD LOWER THRESHOLD PWRGD Figure 5. VID Transition Timing Each SMPS can be individually set to operate in pulse- skipping mode when its PSI_L bit is set ...
Page 30
AMD 2-/3-Output Mobile Serial VID Controller Table 4. Output-Voltage VID DAC Codes OUTPUT SVID[6:0] VOLTAGE SVID[6:0] (V) 000_0000 1.5500 010_0000 000_0001 1.5375 010_0001 000_0010 1.5250 010_0010 000_0011 1.5125 010_0011 000_0100 1.5000 010_0100 000_0101 1.4875 010_0101 000_0110 1.4750 010_0110 000_0111 1.4625 ...
Page 31
DH_ LX_ DL_ MAX17080 CSP_ CSN_ A) OUTPUT SERIES RESISTOR SENSING DH_ LX_ DL_ MAX17080 CSP_ CSN_ B) LOSSLESS INDUCTOR DCR SENSING Figure 6. Current-Sense Configurations formed by the current-sense resistor’s parasitic induc- tance: L ESL = ...
Page 32
AMD 2-/3-Output Mobile Serial VID Controller DC_IN V DDIO SVC/SVD SHDN GNDS1 OR GNDS2 (VDD_PLANE_STRAP) SMPS V OUT PWRGD PGD_IN RESET_L Figure 7. Startup Sequence NB SMPS Current Sense The NB current sense is achieved by sensing the volt- age ...
Page 33
For automatic startup, the battery voltage should be present before the controller attempts to bring CC the output into regulation without the battery voltage present, the fault latch trips. The controller remains shut down until the fault ...
Page 34
AMD 2-/3-Output Mobile Serial VID Controller PSI_L SVC/SVD BUS IDLE SMPS V OUT (HIGH DAC TARGET) TARGET (LOW DAC TARGET) SMPS V OUT PGD_IN PWRGD Figure 8. PGD_IN Timing THRM PLACE R NEXT TO THE NTC THRM ...
Page 35
When the OVP circuit detects an overvoltage fault in core SMPSs, it immediately sets the fault latch and forces the external low-side driver high on the faulted SMPS. The nonfaulted SMPSs are also shut down by turning on the internal ...
Page 36
AMD 2-/3-Output Mobile Serial VID Controller MAX17080 (R )* BST BST C BST BYP PGND (R )* OPTIONAL—THE RESISTOR LOWERS EMI BY DECREASING BST THE SWITCHING NODE RISE TIME OPTIONAL—THE CAPACITOR ...
Page 37
Table 7. ILIM3 Setting PEAK CURRENT ILIM3 LIMIT (A) V 4.0 CC 3.3V 3.4 2V 2.8 GND 2.2 SMPS Design Procedure Firmly establish the input voltage range and maximum load current before choosing a switching frequency and inductor operating point ...
Page 38
AMD 2-/3-Output Mobile Serial VID Controller ⎛ − ⎜ IN OUT = L ⎜ LIR ⎝ SW LOAD MAX ( ) where I is the maximum current per phase, LOAD(MAX) and f is the switching frequency ...
Page 39
Core Input Capacitor Selection The input capacitor must meet the ripple-current requirement (I ) imposed by the switching currents. RMS For a dual 180° interleaved controller, the out-of-phase operation reduces the RMS input ripple current, effec- tively lowering the input ...
Page 40
AMD 2-/3-Output Mobile Serial VID Controller Ideally, the losses at V should be roughly equal to IN(MIN) losses with lower losses in between. If the IN(MAX) losses at V are significantly higher than the losses IN(MIN) at ...
Page 41
According to the manufacturer’s data sheet, a single IRF7811W has a maximum gate charge of 24nC (V 5V). Using the above equation, the required boost capacitance would be: × 24µ ...
Page 42
AMD 2-/3-Output Mobile Serial VID Controller When using low-capacity ceramic filter capacitors, capacitor size is usually determined by the capacity needed to prevent V from causing problems during SOAR load transients. Generally, once enough capacitance is added to meet the ...
Page 43
DATA OUTPUT BY MASTER DATA OUTPUT BY MAX17080 SVC FROM MASTER S START CONDITION Figure 12. SVI Bus Acknowledge START SLAVE ADDRESS S FIXED VALUES Figure 13. SVI Bus Data Transfer Summary The SVI bus is not busy when both ...
Page 44
AMD 2-/3-Output Mobile Serial VID Controller Table 8. SVI Send Byte Address Description BIT DESCRIPTION 6:4 Always 110b. 3 X—don’t care. VDD1, if set then the following data byte contains the VID for VDD1. Bit 2 is ignored in combined ...
Page 45
Follow these guidelines for good PCB layout: • Keep the high-current paths short, especially at the ground terminals. This is essential for stable, jitter- free operation. • Connect all analog grounds to a separate ...
Page 46
AMD 2-/3-Output Mobile Serial VID Controller C OUT C OUT INDUCTOR VCC + CONNECT THE EXPOSED PAD TO POWER GND USING MULTIPLE VIAS Figure 14. PCB Layout Example 46 ______________________________________________________________________________________ SPLIT CORE CPU SOCKET V ...
Page 47
Pin Configuration TOP VIEW THRM CSP1 33 CSN1 34 35 FBDC1 MAX17080 FBAC1 36 37 GNDS1 38 OPTION + 39 OSC 40 TIME ...
Page 48
... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 48 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products ...