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LM2619

更新时间： 2024-11-24 02:58:27
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500-mA Sub-Miniature Step-Down DC-DC Converter

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