Step-Down Converter. RT2657BQ Datasheet


RT2657BQ Converter. Datasheet pdf. Equivalent


Part Number

RT2657BQ

Description

2.25MHz 600mA Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 13 Pages
Datasheet
Download RT2657BQ Datasheet


RT2657BQ
®
RT2657BQ
2.25MHz 600mA Synchronous Step-Down Converter
General Description
The RT2657BQ is a high efficiency Pulse-Width-
Modulated (PWM) step-down DC/DC converter, capable
of delivering 600mA output current over a wide input voltage
range from 2.7V to 5.5V. The RT2657BQ is ideally suited
for portable electronic devices that are powered from 1-
cell Li-ion battery or from other power sources such as
cellular phones, PDAs, hand-held devices, game console
and related accessories.
The internal synchronous rectifier with low RDS(ON)
dramatically reduces conduction loss at PWM mode.
No external Schottky diode is required in practical
applications. The RT2657BQ enters Low Dropout Mode
when normal Pulse -Width Mode cannot provide regulated
output voltage by continuously turning on the high-side
P-MOSFET. The RT2657BQ enters shut-down mode and
consumes less than 5μA when the EN pin is pulled low.
The switching ripple is easily smoothed-out by small
package filtering elements due to a fixed operating
frequency of 2.25MHz.
The RT2657BQ is available in the small WDFN-8L 3x3
package.
Marking Information
5L=YM
DNN
5L= : Product Code
YMDNN : Date Code
Features
VIN Range 2.7V to 5.5V
VOUT Range 0.6V to 5.5V (100% Duty Ratio Operation)
VREF = 0.6V
ISD 5μA (VEN = 0V)
Current Mode Control, Internal Compensation
Fixed FSW 2.25MHz
RDS(ON) 230mΩ HS/250mΩ LS (P-MOSFET/
N-MOSFET)
Enable (VIH = 1V, VIL = 0.4V)
Internal Soft-Start (0.3ms)
Up to 600mA Output Current
Up to 90% Efficiency
Peak ILIMIT (1.5A Typical / 0.8A Min); UVLO; UVP;
VIN and VOUT OVP; and OTP (150°C)
No Schottky Diode Required
Internal Compensation to Reduce External
Components
AEC-Q100 Grade 3 Certification
Applications
Automotive Audio, Information & Navigation
Industrial-Grade General Purpose Point-of -Load
Simplified Application Circuit
RT2657BQ
L1
VIN VIN LX
VOUT
CIN C1 R1 COUT
EN FB
GND
R2
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS2657BQ-00 July 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT2657BQ
RT2657BQ
Ordering Information
Pin Configurations
RT2657BQ
(TOP VIEW)
Package Type
QW : WDFN-8L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
LX 1
NC 2
FB 3
NC 4
8 GND
7 VIN
6 EN
9 5 NC
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
WDFN-8L 3x3
Function Pin Description
Pin No.
Pin Name
Pin Function
1 LX
Switch Node. Connect to the external inductor.
2, 4, 5
NC
No Internal Connection. Connect to GND.
3 FB
Feedback Voltage Input. Connect to the external resistor divider.
6 EN
Enable Control Input (Activ e High).
7 VIN
Power Input. Connect to the input capacitor.
8,
9 (Exposed Pad)
GND
Power GND. The Exposed Pad must be soldered to a large PCB and connected
to GND f or maximum power dissipation.
Function Block Diagram
EN
Slope
Compensation
OSC &
Shutdown
Control
Current
Sense
Error
Amplifier
FB
PWM
RC Comparator
COMP
UVLO &
Power Good
Detector
Current
Limit
Detector
Control
Logic
VREF
VIN
RS1
Driver
LX
RS2
GND
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2657BQ-00 July 2014


Features ® RT2657BQ 2.25MHz 600mA Synchronous S tep-Down Converter General Description The RT2657BQ is a high efficiency Puls e-WidthModulated (PWM) step-down DC/DC converter, capable of delivering 600mA output current over a wide input voltag e range from 2.7V to 5.5V. The RT2657BQ is ideally suited for portable electro nic devices that are powered from 1cell Li-ion battery or from other power sou rces such as cellular phones, PDAs, han d-held devices, game console and relate d accessories. The internal synchronous rectifier with low RDS(ON) dramaticall y reduces conduction loss at PWM mode. No external Schottky diode is required in practical applications. The RT2657BQ enters Low Dropout Mode when normal Pu lse -Width Mode cannot provide regulate d output voltage by continuously turnin g on the high-side P-MOSFET. The RT2657 BQ enters shut-down mode and consumes l ess than 5μA when the EN pin is pulled low. The switching ripple is easily sm oothed-out by small package filtering elements due to a fixed ope.
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