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LM53635LQRNLTQ1 Datasheet(PDF) 4 Page - Texas Instruments

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Part # LM53635LQRNLTQ1
Description  Step-Down DC-DC Converter
Download  55 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM53635LQRNLTQ1 Datasheet(HTML) 4 Page - Texas Instruments

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PVIN 2
AVIN
PVIN 1
SW
AGND
FB
BIAS
CBOOT
SYNC
PGND2
PGND1
PGND2
PGND2
PGND2
VCC
FPWM
NC
PGND1
PGND1
PGND1
RESET
EN
4
LM53625-Q1, LM53635-Q1
SNVSAA7A – DECEMBER 2015 – REVISED MAY 2016
www.ti.com
Product Folder Links: LM53625-Q1 LM53635-Q1
Submit Documentation Feedback
Copyright © 2015–2016, Texas Instruments Incorporated
(1)
A = Analog, O = Output, I = Input, G = Ground, P = Power
6 Pin Configuration and Functions
RNL Package
22-Pin VQFN
Top View
Pin Functions
PIN
I/O(1)
DESCRIPTION
NO.
NAME
1
VCC
A
Internal 3.1-V LDO output. Used as supply to internal control circuits. Connect a high-quality
4.7-µF capacitor from this pin to AGND.
2
CBOOT
P
Bootstrap capacitor connection for gate drivers. Connect a high quality 470-nF capacitor from
this pin to the SW pin.
3
SYNC
I
Synchronization input to regulator. Used to synchronize the device switching frequency to a
system clock. Triggers on rising edge of external clock; frequency must be in the range of
1.9 MHz and 2.3 MHz.
4
PVIN1
P
Input supply to regulator. Connect input bypass capacitors directly to this pin and PGND
pins. Connect PVIN1 and PVIN2 pins directly together at PCB.
5, 6, 7, 8
PGND1
G
Power ground to internal low side MOSFET. These pins must be tied together on the PCB.
Connect PGND1 and PGND2 directly together at PCB. Connect to AGND and system
ground.
9
SW
P
Regulator switch node. Connect to power inductor.
10, 11, 12, 13
PGND2
G
Power ground to internal low side MOSFET. These pins must be tied together. Connect
PGND1 and PGND2 directly together at PCB. Connect to AGND and system ground.
14
PVIN2
P
Input supply to regulator. Connect input bypass capacitors directly to this pin and PGND
pins. Connect PVIN1 and PVIN2 pins directly together at PCB.
15
AVIN
A
Analog VIN, Connect to PVIN1 and PVIN2 on PCB.
16
FPWM
I
Do not float. Mode control input of regulator. High = FPWM, low = Automatic light load mode.
17
NC
No internal connection
18
EN
I
Enable input to regulator. High = on, Low = off. Can be connected to VIN. Do not float.
19
RESET
O
Open drain reset output flag. Connect to suitable voltage supply through a current limiting
resistor. High = regulator OK, Low = regulator fault. Goes low when EN = low.
20
AGND
G
Analog ground for regulator and system. All electrical parameters are measured with respect
to this pin. Connect to PGND on PCB
21
FB
A
Feedback input to regulator. Connect to output voltage node for fixed VOUT options.
Connect to feedback voltage divider for adjustable option.
22
BIAS
P
Input to auxiliary bias regulator. Connect to output voltage node.


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