Datasheet LTM4671 (Analog Devices) - 10

link to page 15 link to page 15 link to page 15 link to page 15 LTM4671
PIN FUNCTIONS PACKAGE ROW AND COLUMN LABELING MAY VARY RUN0 (F11), RUN3 (P7):
Run Control Input of Each 12A
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
Switching Mode Regulator Channel. Enable regulator
LAYOUT CAREFULLY.
operation by tying the specific RUN pin above 1.2V. Tying
VIN (D7-D11, E8, H6, J5-J6, L5-L6, M6, R10, T7-T11):
it below 1.1V shuts down the specific regulator channel. Power Input. Pins connect to the drain of the internal top
COMP0a (H10), COMP3a (N9):
Current Control Thresh- MOSFET and Signal VIN to the internal 3.3V regulator for old and Error Amplifier Compensation Point of Each 12A the control circuitry for each switching mode regulator Switching Mode Regulator Channel. The internal current channel. Apply input voltages between these pins and GND comparator threshold is linearly proportional to this voltage. pins. Recommend placing input decoupling capacitance Tie the COMPa pins from different channels together for directly between each of VIN pins and GND pins. parallel operation. The device is internally compensated.
GND (A4-A5, A8-A11, B4-B11, C4-C11, D4-D6, E3-E5,
Connect to COMP0b or COMP3b, respectively, to use the
F1-F7, G1-G6, G10, H5, H7, J7, J9, K1-K7, K11, L7,
internal compensation. Or connect to a Type-II C-R-C
L11, M5, M7, M10, N1-N6, P1-P5, P11, R3-R5, T4-T6,
network to use customized compensation.
U4-U11, V4-V11, W4-W5, W8-W11):
Power Ground Pins
COMP0b (H11), COMP3b (N8):
Internal Loop Compen- for Both Input and Output Returns. Use large PCB copper sation Network for Each 12A Switching Mode Regulator areas to connect all GND together. Channel. Connect to COMP0a or COMP3a, respectively, to use the internal compensation in majority of applications.
PINS FOR DUAL 12A CHANNELS: FB0 (G9), FB3 (N10):
The Negative Input of the Error
VOUT0 (A1-A3, B1-B3, C1-C3, D1-D3, E1-E2), VOUT3
Amplifier for Each 12A Switching Mode Regulator Channel.
(R1-R2, T1-T3, U1-U3, V1-V3, W1-W3):
Power Output This pin is internally connected to VOSNS0+ or VOSNS3+, Pins of Each 12A Switching Mode Regulator Channel. respectively, with a 60.4kΩ precision resistor. Output Apply output load between these pins and GND pins. Rec- voltages can be programmed with an additional resistor ommend placing output decoupling capacitance directly between FB and VOSNS– pins. In PolyPhase® operation, between these pins and GND pins. See the Applications tying the FB pins together allows for parallel operation. Information section for paralleling outputs. See the Applications Information section for details.
PGOOD0 (E11), PGOOD3 (R7):
Output Power Good with
TRACK/SS0 (F9), TRACK/SS3 (P9):
Output Tracking and Open-Drain Logic of Each 12A Switching Mode Regulator Soft-Start Pin of Each 12A Switching Mode Regulator Channel. PGOOD is pulled to ground when the voltage on Channel. Allows the user to control the rise time of the the FB pin is not within ±10% of the internal 0.6V reference. output voltage. Putting a voltage below 0.6V on this pin
INTV
bypasses the internal reference input to the error ampli-
CC0 (E7), INTVCC3 (R11):
Internal 3.3V Regulator Output of Each 12A Switching Mode Regulator Channel. fier, instead it servos the FB pin to the TRACK voltage. The internal power drivers and control circuits are pow- Above 0.6V, the tracking function stops and the internal ered from this voltage. Decouple each pin to GND with a reference resumes control of the error amplifier. There’s minimum of 2.2µF local low ESR ceramic capacitor. an internal 6µA pull-up current from INTVCC on this pin, so putting a capacitor here provides soft-start function. See the Applications Information section for details. Rev. B 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Component BGA Pinout Package Description Revision History Package Photo Related Parts