LM26420YSQX/NOPB National Semiconductor, LM26420YSQX/NOPB Datasheet - Page 3

• Manufacturer Part Number: LM26420YSQX/NOPB
• Description: IC REG DUAL SYNC BUCK 2A 16LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Step-Down (Buck)r

Specifications of LM26420YSQX/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 4.5 V
• Current - Output: 2A
• Frequency - Switching: 550kHz
• Voltage - Input: 3 ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: LM26420YSQX

Pin Descriptions 20-Pin eTSSOP
Pin Descriptions 16-Pin LLP
10, 11, DAP
11, 12
17, 18
14, 15
DAP
3, 4
Pin
Pin
1,2
6,7
15
14
10
16
13
20
12
13
16
19
4
9
6
7
5
8
3
1
9
8
5
2
Die Attach Pad
Die Attach Pad
PGND
PGND
PGND
PGND
VIND
VIND
AGND
AGND
Name
Name
VIND
VIND
VINC
VINC
SW
SW
SW
SW
PG
PG
PG
PG
FB
FB
EN
EN
EN
EN
FB
FB
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
Function
Power Input supply for Buck 1.
Power Input supply for Buck 2.
Input supply for control circuitry.
Power ground pin for Buck 1.
Power ground pin for Buck 2.
Signal ground pin. Place the bottom resistor of the feedback network as close as possible
to pin.
Power Good Indicator for Buck 1. Pin is connected through a resistor to an external supply
(open drain output).
Power Good Indicator for Buck 2. Pin is connected through a resistor to an external supply
(open drain output).
Feedback pin for Buck 1. Connect to external resistor divider to set output voltage.
Feedback pin for Buck 2. Connect to external resistor divider to set output voltage.
Output switch for Buck 1. Connect to the inductor.
Output switch for Buck 2. Connect to the inductor.
Enable control input. Logic high enable operation for Buck 1. Do not allow this pin to float
or be greater than VIN + 0.3V.
Enable control input. Logic high enable operation for Buck 2. Do not allow this pin to float
or be greater than VIN + 0.3V.
Connect to system ground for low thermal impedance and as a primary electrical GND
connection.
Function
Power Input supply for Buck 1.
Power Input supply for Buck 2.
Input supply for control circuitry.
Power ground pin for Buck 1.
Power ground pin for Buck 2.
Signal ground pin. Place the bottom resistor of the feedback network as close as possible
to pin.
Power Good Indicator for Buck 1. Pin is connected through a resistor to an external supply
(open drain output).
Power Good Indicator for Buck 2. Pin is connected through a resistor to an external supply
(open drain output).
Feedback pin for Buck 1. Connect to external resistor divider to set output voltage.
Feedback pin for Buck 2. Connect to external resistor divider to set output voltage.
Output switch for Buck 1. Connect to the inductor.
Output switch for Buck 2. Connect to the inductor.
Enable control input. Logic high enable operation for Buck 1. Do not allow this pin to float
or be greater than VIN + 0.3V.
Enable control input. Logic high enable operation for Buck 2. Do not allow this pin to float
or be greater than VIN + 0.3V.
Connect to system ground for low thermal impedance, but it cannot be used as a primary
GND connection.
3
www.national.com