Management Unit. LM26484 Datasheet

LM26484 Unit. Datasheet pdf. Equivalent


Part LM26484
Description Power Management Unit
Feature LM26484 www.ti.com SNVS573F – SEPTEMBER 2008 – REVISED MARCH 2013 LM26484 Power Management Unit C.
Manufacture etcTI
Datasheet
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LM26484 www.ti.com SNVS573F – SEPTEMBER 2008 – REVISED MAR LM26484 Datasheet
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LM26484
LM26484
www.ti.com
SNVS573F – SEPTEMBER 2008 – REVISED MARCH 2013
LM26484 Power Management Unit
Check for Samples: LM26484
FEATURES
1
2 Step-Down DC/DC Converter (Buck)
– 3.0–5.5V Input Range
– Externally Adjustable VOUT:
– Bucks 1 & 2: 0.8V–3.5V @ 2A
– 180° Phase Shift Between Bucks Clocks
– 2 MHz PWM Switching Frequency
– ±1% feedback Voltage Accuracy
– Automatic Soft Start
– Current Overload Protection
– PWM/PFM efficiency Modes Available
• Linear Regulator (LDO) Controller
– 3.0V–5.5V Input Range
– Externally Adjustable VOUT
– ±1.5% Feedback Voltage Accuracy
– Regulated to Low VIN - Low VOUT LI-LO (Low
Input Low Output) NFET Operation
– Input to the LI-LO Configuration, Can Be
Post Regulated When Supply is Regulated
by Buck2
– Up to 1000 mA Output Current by Selection
of External FET
APPLICATIONS
• Digital Cores and I/Os (FPGAs, ASICs, DSPs)
• Automotive Infotainment
• Set-Top-Box
• Cordless Phone Base Station
• Networking Router
• Printers
DESCRIPTION
The LM26484 is a multi-function, configurable Power
Management Unit. This device integrates two highly
efficient 2.0A Step-Down DC/DC converters, one
LDO Controller, a POR (Power On Reset) circuit, and
thermal overload protection circuitry. All regulator
output voltages are externally adjustable. The LDO
controller is a low-voltage NMOS voltage regulator.
The LM26484 is offered in a 5 x 4 x 0.8 mm WQFN-
24 pin package.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2013, Texas Instruments Incorporated



LM26484
LM26484
SNVS573F – SEPTEMBER 2008 – REVISED MARCH 2013
Typical Application Circuit
Comm DC
Input voltage
C9
19
AVDD
4 AVIN
R7
2 ENSW1
6 ENSW2
Power
On-Off
Logic
PVIN
LDO_OUT
C10
R5
13 ENLDO
18
nPOR
RESET
Logic
Control
and
Registers
14 LDOGATE
LDO
CONTROLLER
C11
15 LDOFB
R6
VIN1
1
24
Comm DC
Input voltage
C1
SW1
BUCK1
FB1
PGND_SW1
L1
22
23
C3
3
C4
20
21
VOUT1
R1 C2
R2
BG_vref
Central Bias
Thermal SD
and
Supervisory
VIN2
C4 and C8 usually not needed
depending on the
application layout and
amount of parasitic on board.
Comm DC
Input voltage
7
8 C5
SW2
BUCK2
FB2
PGND_SW2
L2
9
10
C6
5
C8
11
12
VOUT2
R3 C7
R4
17 16
Connection Diagram
19 18 17 16 15 14 13
20 12
21 11
DATE CODE *
22 10
26484SQ
23 9
24 8
12 345 6 7
Figure 1. 24-Lead WQFN Package (top view)
Package NHZ0024B
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