MCP1650REUN MICROCHIP [Microchip Technology], MCP1650REUN Datasheet - Page 12

• Manufacturer Part Number: MCP1650REUN
• Description: 750 kHz Boost Controller
• Manufacturer: MICROCHIP [Microchip Technology]

MCP1650/51/52/53
3.0
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
3.1
EXT is the output pin that drives the external N-channel
MOSFET on and off during boost operation. EXT is
equal to GND for SHDN or UVLO conditions.
3.2
Connect the GND pin to circuit ground. See layout
guidelines for suggested grounding physical layout.
3.3
Input peak current is sensed on CS through the exter-
nal current sense resistor. When the sensed current is
converted to a voltage, the current sense threshold is
122 mV below V
the pulse is terminated asynchronously.
3.4
Connect output voltage of boost converter through
external resistor divider to the FB pin for voltage
regulation. The nominal voltage that is compared to this
input for pulse termination is 1.22V.
3.5
The SHDN input is used to turn the boost converter on
and off. For normal operation, tie this pin high or to V
To turn off the device, tie this pin to low or ground.
DS21876A-page 12
MCP1650
Pin No.
—
—
—
1
2
3
4
5
8
PIN DESCRIPTIONS
External Gate Drive (EXT)
Circuit Ground (GND)
Current Sense (CS)
Feedback Input (FB)
Shutdown Input (SHDN)
MCP1651
Pin No.
IN
—
1
2
3
4
5
6
7
8
PIN FUNCTION TABLE
typical. If that threshold is exceeded,
MCP1652
Pin No.
—
—
1
2
3
4
5
7
8
MCP1653
Pin No.
10
1
2
3
4
6
7
8
9
Symbol
SHDN
GND
IN
LBO
EXT
LBI
PG
V
CS
FB
.
IN
External Gate Drive
Ground
Current Sense
Feedback Input
Shutdown
Low Battery Input
Low Battery Output
Power Good Output
Input Voltage
3.6
LBI is the input pin for the low battery comparator.
When the voltage on this pin falls below the nominal
1.22V threshold setting, the LBO (Low Battery Output)
open-drain is active-low.
3.7
LBO is an active-low, open-drain output capable of
sinking 10 mA when the LBI pin is below the threshold
voltage. LBO is high-impedance during SHDN or UVLO
conditions.
3.8
PG is an active-high, open-drain output capable of
sinking 10 mA when the FB input pin is 15% below its
typical value or more than 15% above its typical value,
indicating that the output voltage is out of regulation.
PG is high impedance during SHDN or UVLO
condition.
3.9
V
source.
IN
is an input supply pin. Tie 2.7V to 5.5V input power
Low Battery Input (LBI)
Low Battery Output (LBO)
Power Good (PG)
Input Voltage (V
Function
2004 Microchip Technology Inc.
IN
)