Datasheet LTM4648 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Low VIN, 10A Step-Down μModule Regulator |
| Pages / Page | 28 / 7 — PIN FUNCTIONS. PACKAGE ROW AND COLUMN LABELING MAY VARY. VOUT_LCL (G9):. … |
| Revision | A |
| File Format / Size | PDF / 1.7 Mb |
| Document Language | English |
PIN FUNCTIONS. PACKAGE ROW AND COLUMN LABELING MAY VARY. VOUT_LCL (G9):. AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
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PIN FUNCTIONS PACKAGE ROW AND COLUMN LABELING MAY VARY VOUT_LCL (G9):
This pin is connected to the top of the
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
internal top feedback resistor for the output. When the
LAYOUT CAREFULLY.
remote sense amplifier is used in the LTM4648, connect
GND (A1-A5, A7-A11, B1, B9-B11, E1, F3, F5, G1-G7):
the remote sense amplifier output DIFFOUT to VOUT_LCL Ground Pins for Both Input and Output Returns. All ground to drive the 10k top feedback resistor. When the remote pins need to connect with large copper areas underneath sense amplifier is not used in the LTM4648, connect the unit. VOUT_LCL to VOUT directly.
TEMP (A6):
Onboard Temperature Diode for Monitoring
FREQ (E3):
Frequency Set Pin. A 10µA current is sourced the VBE Junction Voltage Change with Temperature. See from this pin. A resistor from this pin to ground sets a the Applications Information section. voltage, that in turn, programs the operating frequency.
CLKIN (B3):
External Synchronization Input to Phase De- Alternatively, this pin can be driven with a DC voltage that tector Pin. A clock on this pin will enable synchronization can set the operating frequency. See the AApplications with forced continuous operation. See the Applications Information section. The LTM4648 has an internal resistor Information section. to program frequency to 450kHz.
PHMODE (B4):
This pin can be tied to GND, tied to INTV
TRACK/SS (E5):
Output Voltage Tracking Pin and Soft- CC or left floating. This pin determines the relative phases Start Inputs. The pin has a 1.2µA pull-up current source. between the internal controllers and the phasing of the A capacitor from this pin to ground will set a soft-start CLKOUT signal. See Table 2 in the Operation section. ramp rate. In tracking, the regulator output can be tracked to a different voltage. The different voltage is applied to
MODE (B5):
Mode Select Input. Connect this pin to INTVCC a voltage divider then the slave output’s track pin. This to enable Burst Mode operation. Connect to ground to voltage divider is equal to the slave output’s feedback enable forced continuous mode of operation. Floating this divider for coincidental tracking. See the Applications pin will enable pulse-skipping mode of operation. Information section.
NC (B7-B8, C3-C4):
No Connection Pins. Either float these
FB (E7):
The Negative Input of the Error Amplifier. Internally, pins or connect them to GND for thermal purpose. this pin is connected to VOUT_LCL with a 10k precision
V
resistor. Different output voltages can be programmed
IN (C1, C8, C9, D1, D3-D5, D7-D9 and E8):
Power Input Pins. Apply input voltage between these pins and GND with an additional resistor between VFB and ground pins. pins. Recommend placing input decoupling capacitance In PolyPhase operation, tying the VFB pins together allows directly between V for parallel operation. See the Applications Information IN pins and GND pins. section for details.
VOUT (C10-C11, D10-D11, E9-E11, F9-F11, G10-G11):
Power Output Pins. Apply output load between these pins
RUN (F1):
Run Control Pin. A voltage above 1.4V will turn and GND pins. Recommend placing output decoupling on the module. The RUN pin has a 1µA pull-up current, capacitance directly between these pins and GND pins. once the RUN pin reaches 1.2V an additional 4.5µA pull-up See Table 1. current is added to this pin.
SW (C5):
Switching Node of the Circuit. This pin is used
CLKOUT (F2):
Output Clock Signal for PolyPhase Opera- to check the switching frequency. Leave pin floating. A tion. The phase of CLKOUT is determined by the state of resistor-capacitor snubber can be placed from SW to the PHMODE pin. PGND to eliminate high frequency switch node ringing.
INTVCC (F4):
Internal 5V LDO for Driving the Control Cir- See the Applications Information section. cuitry and the Power MOSFET Drivers. The 5V LDO has
PGOOD (C7):
Output Voltage Power Good Indicator. a 100mA current limit. Open-drain logic output that is pulled to ground when the output voltage is not within ±10% of the regulation point. Rev A For more information www.analog.com 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Design Resources Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Design Resources Related Parts
PIN FUNCTIONS PACKAGE ROW AND COLUMN LABELING MAY VARY VOUT_LCL (G9):
This pin is connected to the top of the
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
internal top feedback resistor for the output. When the
LAYOUT CAREFULLY.
remote sense amplifier is used in the LTM4648, connect
GND (A1-A5, A7-A11, B1, B9-B11, E1, F3, F5, G1-G7):
the remote sense amplifier output DIFFOUT to VOUT_LCL Ground Pins for Both Input and Output Returns. All ground to drive the 10k top feedback resistor. When the remote pins need to connect with large copper areas underneath sense amplifier is not used in the LTM4648, connect the unit. VOUT_LCL to VOUT directly.
TEMP (A6):
Onboard Temperature Diode for Monitoring
FREQ (E3):
Frequency Set Pin. A 10µA current is sourced the VBE Junction Voltage Change with Temperature. See from this pin. A resistor from this pin to ground sets a the Applications Information section. voltage, that in turn, programs the operating frequency.
CLKIN (B3):
External Synchronization Input to Phase De- Alternatively, this pin can be driven with a DC voltage that tector Pin. A clock on this pin will enable synchronization can set the operating frequency. See the AApplications with forced continuous operation. See the Applications Information section. The LTM4648 has an internal resistor Information section. to program frequency to 450kHz.
PHMODE (B4):
This pin can be tied to GND, tied to INTV
TRACK/SS (E5):
Output Voltage Tracking Pin and Soft- CC or left floating. This pin determines the relative phases Start Inputs. The pin has a 1.2µA pull-up current source. between the internal controllers and the phasing of the A capacitor from this pin to ground will set a soft-start CLKOUT signal. See Table 2 in the Operation section. ramp rate. In tracking, the regulator output can be tracked to a different voltage. The different voltage is applied to
MODE (B5):
Mode Select Input. Connect this pin to INTVCC a voltage divider then the slave output’s track pin. This to enable Burst Mode operation. Connect to ground to voltage divider is equal to the slave output’s feedback enable forced continuous mode of operation. Floating this divider for coincidental tracking. See the Applications pin will enable pulse-skipping mode of operation. Information section.
NC (B7-B8, C3-C4):
No Connection Pins. Either float these
FB (E7):
The Negative Input of the Error Amplifier. Internally, pins or connect them to GND for thermal purpose. this pin is connected to VOUT_LCL with a 10k precision
V
resistor. Different output voltages can be programmed
IN (C1, C8, C9, D1, D3-D5, D7-D9 and E8):
Power Input Pins. Apply input voltage between these pins and GND with an additional resistor between VFB and ground pins. pins. Recommend placing input decoupling capacitance In PolyPhase operation, tying the VFB pins together allows directly between V for parallel operation. See the Applications Information IN pins and GND pins. section for details.
VOUT (C10-C11, D10-D11, E9-E11, F9-F11, G10-G11):
Power Output Pins. Apply output load between these pins
RUN (F1):
Run Control Pin. A voltage above 1.4V will turn and GND pins. Recommend placing output decoupling on the module. The RUN pin has a 1µA pull-up current, capacitance directly between these pins and GND pins. once the RUN pin reaches 1.2V an additional 4.5µA pull-up See Table 1. current is added to this pin.
SW (C5):
Switching Node of the Circuit. This pin is used
CLKOUT (F2):
Output Clock Signal for PolyPhase Opera- to check the switching frequency. Leave pin floating. A tion. The phase of CLKOUT is determined by the state of resistor-capacitor snubber can be placed from SW to the PHMODE pin. PGND to eliminate high frequency switch node ringing.
INTVCC (F4):
Internal 5V LDO for Driving the Control Cir- See the Applications Information section. cuitry and the Power MOSFET Drivers. The 5V LDO has
PGOOD (C7):
Output Voltage Power Good Indicator. a 100mA current limit. Open-drain logic output that is pulled to ground when the output voltage is not within ±10% of the regulation point. Rev A For more information www.analog.com 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Design Resources Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Design Resources Related Parts
