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Details, datasheet, quote on part number:LM2619ATLX
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| Part: | LM2619ATLX |
| Category: | Power Management => Regulators => Switching Regulators |
| Description: | LM2619 - 500mA Sub-miniature Step-down DC-DC Converter, Package: Microsmd, Pin Nb=10 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM2619ATLX datasheet File size : 865 kB |
| Request For quote: | Find where to buy LM2619ATLX
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Datasheet text preview:
LM2619 500mA Sub-Miniature Step-Down DC-DC Converter
November 2002
LM2619 500mA Sub-Miniature Step-Down DC-DC Converter
General 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. 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 500kHz to 1MHz. Low current hysteretic PFM mode reduces quiescent current to 160µA (typ.). Shutdown mode turns the device off and reduces battery consumption to 0.02µA (typ.). Current limit and thermal shutdown features protect the device and system during fault conditions. The LM2619 is available in a 10 bump micro SMD package. This packaging uses National's chip-scale micro SMD technology and offers the smallest possible size. A high switching frequency (600kHz) allows use of tiny surface-mount components. The device features external compensation to tailor the response to a wide range of operating conditions.
Key Specifications
Operates from a single LiION cell (2.8V to 5.5V) Output voltage (1.5V to 3.6V) ± 1% DC feedback voltage precision 500mA maximum load capability 600µA typ PWM mode quiescent current 0.02µA typ shutdown current 600kHz PWM switching frequency SYNC input for PWM mode frequency synchronization from 500kHz to 1MHz n High efficiency (96% typ at 3.9VIN, 3.6VOUT and 200mA) in PWM mode from internal synchronous rectification n 100% Maximum Duty Cycle for Lowest Dropout n n n n n n n n
Features
n n n n n n n Sub-miniature 10-bump thin micro SMD package Uses small ceramic capacitors 5mV typ PWM mode output voltage ripple(COUT = 22µF) Internal soft start Current overload protection Thermal Shutdown External compensation
Applications
n n n n Mobile Phones Hand-Held Radios RF PC Cards Wireless LAN Cards
© 2002 National Semiconductor Corporation
DS200574
www.national.com
LM2619
Typical Application Circuits
20057401
FIGURE 1. Typical Circuit for 1.8V Output Voltage
20057402
FIGURE 2. Typical Circuit for 2.5V Output Voltage
20057403
FIGURE 3. Typical Circuit for 1.5V Output Voltage
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LM2619
Connection Diagrams
10-Bump micro SMD Package
20057404
20057405
Top View
Bottom View
Ordering Information
Order Number LM2619ATL LM2619ATLX Package Type 10-bump Wafer Level Chip Scale (micro SMD) NSC Package Marking (*) XYTT S76A XYTT S76A Supplied As 250 Tape and Reel 3000 Tape and Reel
(*) XY - denotes the date code marking (2 digit) in production (*) TT - refers to die run/lot traceability for production (*) S - product line designator Package markings may change over the course of production.
Pin Description
Pin Number A1 B1 C1 D1 Pin Name FB EANEG EAOUT SYNC/MODE Feedback Analog Input. Inverting input of error amplifier. Output of error amplifier. Synchronization Input. Use this digital input for frequency selection or modulation control. Set: SYNC/MODE = high for low-noise 600kHz PWM mode SYNC/MODE = low for low-current PFM mode SYNC/MODE = a 500kHz 1MHz external clock for synchronization in PWM mode. (See Synchronization and Operating Modes in the Device Information section.) Enable Input. Set this Schmitt trigger digital input high for normal operation. For shutdown, set low. Set EN low during system power-up and other low supply voltage conditions. (See Shutdown Mode in the Device Information section.) Power Ground. Switching Node connection to the internal PFET switch and NFET synchronous rectifier. Connect to an inductor with a saturation current rating that exceeds the max Switch Peak Current Limit of the LM2619. Power Supply Voltage Input to the internal PFET switch. Connect to the input filter capacitor. Analog Supply Input. If board layout is not optimum, an optional 0.1µF ceramic capacitor is suggested. Analog and Control Ground. Function
D2
EN
D3 C3
PGND SW
B3 A3 A2
PVIN VDD SGND
3
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