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LM2619 bảng dữ liệu(PDF) 1 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  500-mA Sub-Miniature Step-Down DC-DC Converter
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LM2619 bảng dữ liệu(HTML) 1 Page - Texas Instruments

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background image
FB
EN
VDD
PVIN
EAOUT
EANEG SGND
PGND
SW
SYNC/
MODE
ON/OFF
6.65k
33.2k
22PF
LM2619
.
VIN
2.8V to
5 5V
VOU T
1.8 V
PWM/PFM
39.2k
10PF
330pF
1 0 PH
FB
EN
VDD
PVIN
EAOUT
EANEG SGND
PGND
SW
SYNC/
MODE
ON/OFF
22.1k
33.2k
68.1k
330pF
22PF
LM2619
.
VIN
3.2V to
5 5V
VOU T
2.5V
PWM/PFM
10 PH
10PF
LM2619
www.ti.com
SNVS212B – NOVEMBER 2002 – REVISED MAY 2013
500-mA Sub-Miniature Step-Down DC-DC Converter
Check for Samples: LM2619
1
FEATURES
DESCRIPTION
The
LM2619
step
down
DC-DC
converter
is
2
Sub-Miniature 10-Bump Thin DSBGA Package
optimized for powering circuits from a single lithium-
Uses Small Ceramic Capacitors
ion cell. It steps down an input voltage of 2.8V to
5-mV (Typical) PWM Mode Output Voltage
5.5V to an output of 1.5V to 3.6V at up to 500mA.
Ripple (COUT = 22 µF)
Output voltage is set using resistor feedback dividers.
Internal Soft Start
The device offers three modes for mobile phones and
similar portable applications. Fixed-frequency PWM
Current Overload Protection
mode minimizes RF interference. A SYNC input
Thermal Shutdown
allows synchronizing the switching frequency in a
External Compensation
range of 500 kHz to 1 MHz. Low-current hysteretic
PFM mode reduces quiescent current to 160 µA
KEY SPECIFICATIONS
(typical). Shutdown mode turns the device off and
reduces battery consumption to 0.02 µA (typical).
Operates from a single Li-ion cell : 2.8V to 5.5V
Current limit and thermal shutdown features protect
Output voltage : 1.5V to 3.6V
the device and system during fault conditions.
DC feedback voltage precision: ±1%
The LM2619 is available in a 10-bump DSBGA
Maximum Load Capability: 500mA
package. This packaging uses chip-scale DSBGA
PWM Mode Quiescent Current: 600µA typ
technology and offers the smallest possible size. A
Shutdown Current: 0.02 µA typ
high switching frequency (600 kHz) allows use of tiny
surface-mount components.
PWM switching frequency: 600kHz
SYNC input for PWM mode frequency
The device features external compensation to tailor
synchronization from 0.5MHz to 1MHz
the response to a wide range of operating conditions.
High efficiency (96% typical at 3.9 VIN, 3.6 VOUT
APPLICATIONS
and 200 mA) in PWM mode from internal
synchronous rectification
Mobile Phones
100% Maximum Duty Cycle for Lowest
Hand-Held Radios
Dropout
RF PC Cards
Wireless LAN Cards
Typical Application Circuits
Figure 1. Typical Circuit for 1.8-V Output Voltage
Figure 2. Typical Circuit for 2.5-V Output Voltage
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.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2002–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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