LTM4650 datasheet(6/36 Pages) AD

6 / 36 page

LTM4650-2

Rev. 0

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

Single-Phase Short-Circuit

Protection with 25A

Single-Phase Short-Circuit

Protection with No load

Single-Phase Start-Up with 25A

20ms/DIV

VSW

10V/DIV

VOUT

0.5V/DIV

IIN

1A/DIV

46502 G10

12VIN, 1.2VOUT, 500kHz

COUT = 470µF ×1 POSCAP + 100µF ×2

CERAMIC, CSS = 0.1 F

50 s/DIV

VSW

10V/DIV

VOUT

0.5V/DIV

IIN

1A/DIV

46502 G11

12VIN, 1.2VOUT, 500kHz

COUT = 470µF ×1 POSCAP + 100µF ×2

CERAMIC, CSS = 0.1µF

50µs/DIV

VSW

10V/DIV

VOUT

0.5V/DIV

IIN

2A/DIV

46502 G12

12VIN, 1.2VOUT, 500kHz

COUT = 470µF ×1 POSCAP + 100µF ×2 CERAMIC

PIN FUNCTIONS

VOUT1 (A1–A5, B1–B5, C1–C4): Power Output Pins.

Apply output load between these pins and GND pins.

Recommend placing output decoupling capacitance

directly between these pins and GND pins. See Table 4.

GND (A6–A7, B6–B7, D1–D4, D9–D12, E1–E4, E10–E12,

F1–F3, F10–F12, G1, G3, G10, G12, H1–H7, H9–H12,

J1, J5, J8, J12, K1, K5–K8, K12, L1, L12, M1, M12):

Power Ground Pins for Both Input and Output Returns.

VOUT2 (A8–A12, B8–B12, C9–C12): Power Output Pins.

Apply output load between these pins and GND pins.

Recommend placing output decoupling capacitance

directly between these pins and GND pins. See Table 4.

VOUTS1, VOUTS2 (C5, C8): This pin is connected to the top

of the internal top feedback resistor for each output. The

pin can be directly connected to its specific output, or

connected to DIFFOUT when the remote sense amplifier is

used. In paralleling modules, one of the VOUTS pins is con-

nected to the DIFFOUT pin in remote sensing or directly

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.

fSET (C6): Frequency Set Pin. A 10µA current is sourced

from this pin. A resistor from this pin to ground sets a volt-

age that programs the operating frequency. Alternatively,

this pin can be driven with a DC voltage that can set the

operating frequency. See the Applications Information

section.

SGND (C7, D6, G6–G7, F6–F7): Signal Ground Pin.

Return ground path for all analog and low-power circuitry.

Tie a single connection to the output capacitor GND in the

application. See the layout guidelines in Figure 23.

VFB1, VFB2 (D5, D7): The Negative Input of the Error

Amplifier for Each Channel. Internally, this pin is con-

nected to VOUTS1 or VOUTS2 with a 60.4kΩ precision

resistor. Different output voltages can be programmed

with an additional resistor between VFB and GND pins. In

PolyPhase® operation, tying the VFB pins together allows

for parallel operation. See the Applications Information

section for details.

TRACK1, TRACK2 (E5, D8): Output Voltage Tracking Pin

and Soft-Start Inputs. Each channel has a 1.3µA pull-up

current source. When one channel is configured to be the

main of the two channels, then a capacitor from this pin

(Recommended to use test points to monitor signal pin connections.)

PACKAGE ROW AND COLUMN LABELING MAY VARY

AMONG µModule PRODUCTS. REVIEW EACH PACKAGE

LAYOUT CAREFULLY.

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