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LM20124-Q1 Arkusz danych(PDF) 9 Page - Texas Instruments

Numer części LM20124-Q1
Szczegółowy opis  4A, 1MHz PowerWise짰 Synchronous Buck Regulator
Download  28 Pages
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

LM20124-Q1 Arkusz danych(HTML) 9 Page - Texas Instruments

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6.0A
+
-
COMP
CONTROL
LOGIC
CURRENT
LIMIT
OVERVOLTAGE
UNDERVOLTAGE
ERROR AMP
PWM COMPARATOR
SS/TRK
PGOOD
+
-
+2.7V
REGULATOR
PVIN
PVIN
THERMAL
PROTECTION
PGND
SW
AVIN
CURRENT SENSE
VCC
1.18V
UVLO
2.7V
AGND
OSCILLATOR
+
752 mV
864 mV
PG-L
PG-L
2.7V
5 PA
gm = 510 Pmho
800 mV
+
-
+
DISCHARGE
DISCHARGE
SLOPE COMP
DIODE
EMULATION
+
-
VREF
+
-
FB
EN
+
-
+
-
(50 Ps)
+
-
+
-
PVIN
LM20124, LM20124-Q1
www.ti.com
SNVS507F – OCTOBER 2007 – REVISED MARCH 2013
BLOCK DIAGRAM
OPERATION DESCRIPTION
GENERAL
The LM20124 switching regulator features all of the functions necessary to implement an efficient low voltage
buck regulator using a minimum number of external components. This easy to use regulator features two
integrated switches and is capable of supplying up to 4A of continuous output current. The regulator utilizes peak
current mode control with nonlinear slope compensation to optimize stability and transient response over the
entire output voltage range. Peak current mode control also provides inherent line feed-forward, cycle-by-cycle
current limiting and easy loop compensation. The fixed 1 MHz operating frequency minimizes the inductor size
while still achieving efficiencies up to 96%. The precision internal voltage reference allows the output to be set as
low as 0.8V. Fault protection features include: current limiting, thermal shutdown, over voltage protection, and
shutdown capability. The device is available in the TSSOP 16-pin package featuring an exposed pad to aid
thermal dissipation. The LM20124 can be used in numerous applications to efficiently step-down from a 5V or
3.3V bus. The typical application circuit for the LM20124 is shown in Figure 25 in the design guide.
PRECISION ENABLE
The enable (EN) pin allows the output of the device to be enabled or disabled with an external control signal.
This pin is a precision analog input that enables the device when the voltage exceeds 1.18V (typical). The EN pin
has 66 mV of hysteresis and will disable the output when the enable voltage falls below 1.11V (typical). If the EN
pin is not used, it should be connected to VIN. Since the enable pin has a precise turn-on threshold it can be
used along with an external resistor divider network from VIN to configure the device to turn-on at a precise input
voltage. The precision enable circuitry will remain active even when the device is disabled.
Copyright © 2007–2013, Texas Instruments Incorporated
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