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PDF RT2875B Data sheet ( Hoja de datos )
| Número de pieza | RT2875B | |
| Descripción | Synchronous Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT2875A/B
3A, 36V, Synchronous Step-Down Converter
General Description
The RT2875A/B is a high efficiency, current-mode
synchronous DC/DC step-down converter that can deliver
up to 3A output current over a wide input voltage range
from 4.5V to 36V. The device integrates 95mΩ high-side
and 70mΩ low-side MOSFETs to achieve high conversion
efficiency. The current-mode control architecture
supports fast transient response and simple external
compensation. A cycle-by-cycle current limit function
provides protection
against shorted output and an external soft-start eliminates
input current surge during start-up. The RT2875A/B
provides complete protection functions such as input
under-voltage lockout, output under-voltage protection,
over-current protection and thermal shutdown.
The RT2875A/B is available in the thermal enhanced
TSSOP-14 (Exposed Pad) package.
Pin Configurations
(TOP VIEW)
SW
SW
PGND
RT/SYNC
AGND
RLIM
FB
14
2 13
3 12
4 PGND 11
5 10
6 15 9
78
BOOT
VIN
VIN
PGOOD
EN
SS
COMP
TSSOP-14 (Exposed Pad)
Features
3A Output Current
Internal N-MOSFETs
Current Mode Control
Adjustable Switching Frequency : 300kHz to 2.1MHz
Adjustable Current Limit : 1.5A to 6A
Synchronous to External Clock : 300kHz to 2.1MHz
Adjustable Output Voltage from 0.6V to 24V
High Efficiency Up to 95%
Stable with Low ESR Ceramic Output Capacitors
Cycle-by-Cycle Current Limit
Input Under-Voltage Lockout
Output Under-Voltage Protection
Thermal Shutdown
AEC-Q100 Grade 2 Certification
RoHS Compliant and Halogen Free
Applications
Point of Load Regulator in Distributed Power Systems
Digital Set Top Boxes
Broadband Communications
Vehicle Electronics
Simplified Application Circuit
VIN
Enable
PGOOD
CIN
RLIM ROSC
VIN BOOT
RT2875A/B
SW
EN
PGOOD
RLIM
FB
RT/SYNC COMP
SS
AGND PGND
CBOOT L
RCOMP CCOMP
CSS
VOUT
R1
COUT
R2
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS2875A/B-04 August 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT2875A/B
Absolute Maximum Ratings (Note 1)
Supply Voltage, VIN ------------------------------------------------------------------------------------------------ −0.3V to 40V
Switch Voltage, SW ------------------------------------------------------------------------------------------------ −0.3V to (VIN + 0.3V)
BOOT to SW --------------------------------------------------------------------------------------------------------- −0.3V to 6V
Power Good Voltage, PGOOD ------------------------------------------------------------------------------------ −0.3V to 40V
Other Pins ------------------------------------------------------------------------------------------------------------- −0.3V to 6V
Power Dissipation, PD @ TA = 25°C
TSSOP-14 (Exposed Pad) ---------------------------------------------------------------------------------------- 4.464W
Package Thermal Resistance (Note 2)
TSSOP-14 (Exposed Pad), θJA ---------------------------------------------------------------------------------- 28°C/W
TSSOP-14 (Exposed Pad), θJC ---------------------------------------------------------------------------------- 4.3°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range -------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------- 4.5V to 36V
Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 150°C
Ambient Temperature Range -------------------------------------------------------------------------------------- −40°C to 105°C
Electrical Characteristics
(VIN = 12V, TA = −40°C to 105°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Shutdown Supply Current
Switching quiescent current with
no load at DCDC output
Feedback Voltage
VFB
Error Amplifier Trans-conductance GEA
Switch On-
Resistance
High-Side
Low-Side
High-Side Switch Leakage
Current
Current Limit Setting Rage
RDS(ON)1
RDS(ON)2
VEN = 0V
VEN = 2V, VFB = 0.64V,
RLIM = 91k, ROSC = 169k
4.5V VIN 36V
IC = ±10A
VEN = 0V, VSW = 0V
(Note 5)
-- ‐‐ 10 A
-- -- 1.3 mA
0.588 0.6 0.612 V
-- 950 -- A/V
-- 95 --
m
-- 70 --
-- 1 -- A
1.5 -- 6 A
High-Side Switch Current Limit 1
High-Side Switch Current Limit 2
High-Side Switch Current Limit 3
Low-Side Switch Current Limit
HOC1
HOC2
HOC3
RLIM = 100k
RLIM = 47k
RLIM = 33k
From Drain to Source
1.79 2.1 2.41
3.52 4 4.48
4.84 5.5 6.16
-- 2 --
A
A
A
A
COMP to Current Sense
Transconductance
GCS
-- 5.2 -- A/V
Switching Frequency Range
Include Sync mode and RT mode
set point
300
-- 2100 kHz
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS2875A/B-04 August 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Power Off from VIN
VIN
(5V/Div)
VOUT
(2V/Div)
IOUT
(2A/Div)
VIN = 12V, VOUT = 3.3V, sIOUT =
Time (5ms/Div)
RT2875A/B
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS2875A/B-04 August 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet RT2875B.PDF ] | |
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