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PDF RT8127 Data sheet ( Hoja de datos )
| Número de pieza | RT8127 | |
| Descripción | High Efficiency Dual-Channel Output Synchronous Buck PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8127 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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®
RT8127
High Efficiency Dual-Channel Output Synchronous Buck PWM
Controller with Phase Interleaving and Two LDO Regulators
General Description
The RT8127 is a high efficiency Dual-Channel output
synchronous Buck PWM controller with integrated
MOSFET drivers and two LDOs. This part features Green
Voltage Mode (GVMTM) control, which is specifically
designed to improve efficiency at light load condition. At
light load condition, the RT8127 is pin configurable to
automatically operate in diode emulation mode with
constant on-time PFM to reduce switching frequency so
as to improve conversion efficiency. As the load current
increases, the RT8127 leaves the diode emulation mode
and operates in Continuous Conduction Mode (CCM) with
fixed-frequency, 180° out of phase interleaved PWM to
reduce input capacitance. The RT8127 supports 4.5V to
26V input voltage range and has integrated 5V LDO which
supplies the internal gate drivers as well as the controller.
When channel 1 Buck regulator output voltage is higher
than 5V, the supply voltage will be automatically switched
to the Buck regulator output from the integrated 5V LDO.
The RT8127 supports enable/disable function for each
channel and also features external soft-start, adjustable
switching frequency and power good indication. This device
utilizes lossless inductor DCR current sensing for over
current protection. Other protections include over voltage,
under voltage, thermal shutdown and under voltage
lockout.
The RT8127 is available in a WQFN-28L 4x4 small footprint
package.
Features
z Green Voltage Mode (GVMTM) Control
z High Light Load Efficiency
z Audio-Skip Mode (ASM) at Light Load
z Pin Configurable CCM/DEM Operation
z 180° Interleaving PWM in CCM Operation
z Support 4.5V to 26V Input Voltage Range
z Integrated 5V MOSFET Driver and Bootstrap Circuit
z Integrated 5V and 12V LDO
z Enable Control for Each Channel
z External/Internal Soft-Start
z Programmable LGATE PWM Frequency Setting
(LGFS)
z Automatic Switchable 5V Regulator
z Power Good Indication
z VIN Feed-Forward in Control Loop
z Lossless DCR Current Sensing
z OVP, UVP, OCP, Thermal Shutdown and UVLO
z Small 28-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z Motherboard, Server, Graphic Card
z System Power Supplies
z Power Module
Marking Information
0H= : Product Code
0H=YM
DNN
YMDNN : Date Code
Simplified Application Circuit
VOUT2
VIN
1.4µH
942µF
VIN RT8127
UGATE2
PHASE2
LGATE2
UGATE1
PHASE1
LGATE1
CSP2
CSN2
EN1/SS1
EN2/SS2
GND
CSP1
CSN1
12VLDO
VIN
1.4µH
12V/3.3V
VOUT1
942µF
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8127-05 June 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
PGOOD
PGOOD is actively held low in soft-start, standby, and
shutdown conditions. It is released when both output
voltages of VFB1 and VFB2 are within ±20% of the nominal
regulation point.
LDOBYP
When VLDOBYP is higher than the threshold, the controller
will automatically switch the chip power supply from 5V
LDO to channel 1 output and disable the 5V LDO for power
saving.
Soft-Start
An internal current source charges the internal soft-start
capacitor such that the internal soft-start voltage ramps
up uniformly. The FB voltage will track the internal soft-
start voltage during the soft-start interval.
The RT8127 also provides an external soft-start function.
An additional capacitor connected at SSx pin will be
charged by a 10μA current source and determines the
soft-start time.
RT8127
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8127-05 June 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Typical Operating Characteristics
Efficiency vs. Load Current
100
VIN = 12V, VCC = 5V, VOUT = 5V,
90 EN1 = EN2 = 12VLDOEN
80 = LDOEN = ON
70
60
AUTO SKIP
50
FCCM
40
30
20
10
0
0.001
0.01 0.1
1
Load Current (A)
10
100
Efficiency vs. Load Current
100
VIN = 24V, VCC = 5V, VOUT = 5V,
90 EN1 = EN2 = 12VLDOEN
= LDOEN = ON
80
70
60 AUTO SKIP
50
FCCM
40
30
20
10
0
0.001
0.01 0.1
1
Load Current (A)
10
100
Efficiency vs. Load Current
100
VIN = 19V, VCC = 5V, VOUT = 3.3V,
90 EN1 = EN2 = 12VLDOEN
80 = LDOEN = ON
70
60
AUTO SKIP
50
FCCM
40
30
20
10
0
0.001
0.01 0.1
1
Load Current (A)
10
100
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8127-05 June 2014
RT8127
Efficiency vs. Load Current
100
VIN = 19V, VCC = 5V, VOUT = 5V,
90 EN1 = EN2 = 12VLDOEN
80 = LDOEN = ON
70
60
AUTO SKIP
50
FCCM
40
30
20
10
0
0.001
0.01 0.1
1
Load Current (A)
10
Efficiency vs. Load Current
100
VIN = 12V, VCC = 5V, VOUT = 3.3V,
90 EN1 = EN2 = 12VLDOEN
= LDOEN = ON
80
70
60 AUTO SKIP
50
FCCM
40
30
20
10
0
0.001
0.01 0.1
1
Load Current (A)
10
Efficiency vs. Load Current
100
VIN = 24V, VCC = 5V, VOUT = 3.3V,
90 EN1 = EN2 = 12VLDOEN
80 = LDOEN = ON
70
60
AUTO SKIP
50
FCCM
40
30
20
10
0
0.001
0.01 0.1
1
Load Current (A)
10
100
100
100
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet RT8127.PDF ] | |
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