Datasheet LTM4636-1 (Analog Devices) - 8

LTM4636-1 PIN FUNCTIONS
PACKAGE ROW AND COLUMN LABELING MAY VARY
to ground is internal to the module for setting the RUN
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
pin threshold with a resistor to 5V, and allowing a pull-
LAYOUT CAREFULLY.
up resistor to PVCC for enabling the device. See Figure 1
VOUT (A1-A12, B1-B12, C1-C12, D1-D2, D11-D12):
Power Block Diagram. Output Pins. Apply output load between these pins and GND
TRACK/SS (E3):
Output Voltage Tracking Pin and Soft-Start pins. Recommend placing output decoupling capacitance Inputs. The pin has a 1.25µA pull-up current source. A between these pins and GND pins. Review Table 4. capacitor from this pin to ground will set a soft-start ramp
MODE_PLLIN (H3):
Forced Continuous Mode, Burst Mode rate. In tracking, the regulator output can be tracked to a Operation, or Pulse-Skipping Mode Selection Pin and different voltage. The different voltage is applied to a voltage External Synchronization Input to Phase Detector Pin. divider then to the slave output’s track pin. This voltage Connect this pin to INTVCC to enable pulse-skipping mode divider is equal to the slave output’s feedback divider for of operation. Connect to ground to enable forced continuous coincidental tracking. Default soft-start of 750µs with mode of operation. Floating this pin will enable Burst Mode TRACK/SS pin connected to INTVCC pin. See the Applica- operation. A clock on this pin will enable synchronization tions Information section. In PolyPhase® applications tie with forced continuous operation. See the Applications the TRACK/SS pins together. Information section.
VFB (E4):
The Negative Input of the Error Amplifier. Inter-
V – OUTS1 (D3):
VOUT Sense Ground for the Remote Sense nally, this pin is connected to VOUTS1 with a 4.99k precision Amplifier. This pin connects to the ground remote sense resistor. Different output voltages can be programmed point. Connect to ground when not used. See the Applica- with an additional resistor between V – FB and VOSNS . In tions Information section. PolyPhase operation, tying the VFB pins together allows
V +
for parallel operation. See the Applications Information
OUTS1 (D4):
This pin should connect to VOUT and is connected to V section. FB through a 4.99k resistor. This pin is used to connect to a remote sense point of the load for
COMPA (E5):
Current Control Threshold and Error Amplifier accurate voltage sensing. Either connect to remote sense Compensation Point. The current comparator threshold point or directly to VOUT. See the Applications Information increases with this control voltage. Tie all COMPA pins section for details. together for parallel operation. This pin allows external
COMPB (D5):
Internal compensation network provided that compensation. See the Applications Information section. coincides with proper stability utilizing the values in Table
OVP_TRIP (E10):
This open-drain pin can be used to trip 5. Just connect this pin to COMPA for internal compensa- off and retry an input circuit breaker or alert the system tion. In parallel operation with other LTM4636-1 devices, to an output overvoltage programmed on the OVP_SET connect COMPA and COMPB pins together for internal pin. See the Applications Information section. compensation, then connect all COMPA pins together.
CROWBAR (E11):
This pin can be optionally used to
GND (D6-D9, E6-E9, F7, F8, F10, F12, G1-G2, G6 G10,
clamp the output voltage in an overvoltage condition to
H1, H10-H12, J1-J3, J8-J12, K1-K3, K9-K10, K12, L1-L3,
protect the load to tighter control of overvoltage. See the
L9-L10, L12, M1-M3, M9-M12):
Ground Pins for Both Applications Information section. Input and Output Returns.
SNSP2 (F1):
Current Sense Signal Path. Connect this pin
PGOOD (E1):
Output Voltage Power Good Indicator. Open- to SNSP1 (F2). drain logic output is pulled to ground when the output
SNSP1 (F2):
Current Sense Signal Path. Connect this pin voltage exceeds a ±7.5% regulation window. to SNSP2 (F1). Both pins are used to calibrate current
RUNC (E2):
Run Control Pin. A voltage above 1.35V will sense matching and current limit at final test. turn on the control section of the module. A 10k resistor 46361fa 8 For more information www.linear.com/LTM4636-1