Datasheet LTM4628 (Analog Devices) - 7

LTM4628
TYPICAL PERFORMANCE CHARACTERISTICS IOUT1 and IOUT2 vs Total Current COMP1 and COMP2 for Parallel Operation vs Output Current
9 I 1.4 OUT1 VITH1 8 IOUT2 1.3 VITH2 7 1.2 (A) 6 1.1 OUT2 5 1.0 AND I 4 COMP (V) 0.9 I OUT1 3 0.8 2 0.7 1 0.6 0 0.5 0 2 4 6 8 10 12 14 16 0 1 2 3 4 5 6 7 8 9 TOTAL OUTPUT CURRENT (A) OUTPUT CURRENT (A) 4628 G16 4628 G17
PIN FUNCTIONS (Recommended to Use Test Points to Monitor Signal Pin Connections.) VOUT1 (A1-A5, B1-B5, C1-C4):
Power Output Pins. Apply
fSET (C6):
Frequency Set Pin. A 10µA current is sourced output load between these pins and GND pins. Recommend from this pin. A resistor from this pin to ground sets a placing output decoupling capacitance directly between voltage that in turn programs the operating frequency. these pins and GND pins. Review Table 4. Alternatively, this pin can be driven with a DC voltage
GND (A6-A7, B6-B7, D1-D4, D9-D12, E1-E4, E10-E12,
that can set the operating frequency. See the Applications
F1-F3, F10-F12, G1, G3, G10, G12, H1-H7, H9-H12, J1,
Information section.
J5, J8, J12, K1, K5-K8, K12, L1, L12, M1 , M12):
Power
SGND (C7, D6, G6-G7, F6-F7):
Signal Ground Pin. Return Ground Pins for Both Input and Output Returns. ground path for all analog and low power circuitry. Tie a
V
single connection to the output capacitor GND in the ap-
OUT2 (A8-A12, B8-B12, C9-C12):
Power Output Pins. Apply output load between these pins and GND pins. Rec- plication. See layout guidelines in Figure 27. ommend placing output decoupling capacitance directly
VFB1, VFB2 (D5, D7):
The Negative Input of the Error between these pins and GND pins. Review Table 4. Amplifier for Each Channel. Internally, this pin is con-
V
nected to VOUTS1 or VOUTS2 with a 60.4kΩ precision
OUTS1, VOUTS2 (C5, C8):
This pin is connected to the top of the internal top feedback resistor for each output. The resistor. Different output voltages can be programmed pin can be directly connected to its specific output, or with an additional resistor between VFB and GND pins. In connected to DIFFOUT when the remote sense amplifier PolyPhase® operation, tying the VFB pins together allows is used. In paralleling modules, one of the V for parallel operation. See the Applications Information OUTS pins is connected to the DIFFOUT pin in remote sensing or directly section for details. to VOUT with no remote sensing. It is very important to connect these pins to either the DIFFOUT or VOUT since this is the feedback path, and cannot be left open. See the Applications Information section. 4628fe For more information www.linear.com/LTM4628 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photos Revision History Typical Application Related Parts