The LM2623 is a high-efficiency, general-purpose, step-up DC-DC switching regulator for battery-powered and low input voltage systems. It accepts an input voltage between 0.8 V and 14 V and converts it into a regulated output voltage between 1.24 V and 14 V. Efficiencies up to 90% are achievable with the LM2623.
In order to adapt to a number of applications, the LM2623 allows the designer to vary the output voltage, the operating frequency (300 kHz to 2 MHz) and duty cycle (17% to 90%) to optimize the part's performance. The selected values can be fixed or can vary with battery voltage or input to output voltage ratio. The LM2623 uses a very simple, on/off regulation mode to produce good efficiency and stable operation over a wide operating range. It normally regulates by skipping switching cycles when it reaches the regulation limit (Pulse Frequency Modulation).
Note: See Non-Linear Effect and Choosing The Correct C3 Capacitor so that any challenges with designing with this part can be taken into account before a board design/layout is finalized.
For alternative solutions, See Also: LM2700, LM2622, LM2731, LM2733, and LM2621.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM2623 | WSON (14) | 4.00 mm × 4.00 mm |
VSSOP (8) | 3.00 mm × 3.00 mm |
Changes from H Revision (November 2014) to I Revision
Changes from G Revision (December 2005) to H Revision
PIN | TYPE | DESCRIPTION | |||
---|---|---|---|---|---|
WSON | VSSOP | NAME | |||
1 | — | NC | N/A | No Connect | |
2, 3 | 1 | PGND | GND | Power Ground (WSON Pins 2 and 3 must be shorted together). | |
4 | 2 | EN | Digital | Active-Low Shutdown Input | |
5 | 3 | FREQ | Analog | Frequency Adjust. An external resistor connected between this pin and a voltage source sets the switching frequency of the LM2623. | |
6 | 4 | FB | Analog | Output Voltage Feedback | |
7 | — | NC | N/A | No Connect | |
8 | — | NC | N/A | No connect | |
9 | 5 | SGND | GND | Signal Ground | |
10 | 6 | VDD | Power | Power Supply for Internal Circuitry | |
11 | 7 | BOOT | Analog | Bootstrap Supply for the Gate Drive of Internal MOSFET Power Switch | |
12, 13 | 8 | SW | Analog | Drain of the Internal MOSFET Power Switch. (WSON pins 12 and 13 must be shorted together.) | |
14 | — | NC | N/A | No Connect | |
DAP | — | DAP | Thermal | To be soldered to board for enhanced thermal dissipation. To be electrically isolated/floating. |
MIN | MAX | UNIT | |
---|---|---|---|
SW pin voltage | –0.5 | 14.5 | V |
BOOT, VDD, EN and FB pins | –0.5 | 10 | V |
FREQ pin | 100 | µA | |
TJmax(3) | 150 | °C | |
Lead temp. (soldering, 5 sec) | 260 | °C | |
Power dissipation (TA=25°C)(3) | 500 | mW | |
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | ||||
---|---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | All pins except SW pin | ±2000 | V |
SW pin (VSSOP package pin 8) (WSON package pin 12 and pin 13) | ±1000 | ||||
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | All pins | ±500 |
MIN | MAX | UNIT | |
---|---|---|---|
VDD pin | 3 | 5 | V |
FB, EN pins | 0 | VDD | |
BOOT pin | 0 | 10 | V |
Ambient temperature (TA) | −40 | 85 | °C |
THERMAL METRIC(1) | LM2623 | UNIT | ||
---|---|---|---|---|
NHE (WSON) | DGK (VSSOP | |||
14 PINS | 8 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 46.5 | 152.5 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 37.7 | 53.9 | °C/W |
RθJB | Junction-to-board thermal resistance | 23.6 | 73.2 | °C/W |
ψJT | Junction-to-top characterization parameter | 0.4 | 5.5 | °C/W |
ψJB | Junction-to-board characterization parameter | 23.8 | 72.0 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 4.6 | N/A | °C/W |
PARAMETER | TEST CONDITION | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
VDD_ST | Start-up supply voltage 25°C | ILOAD = 0 mA(1) | 1.1 | V | ||
VIN_OP | Minimum operating supply voltage (once started) | ILOAD = 0 mA | 0.65 | 0.8 | V | |
VFB | FB pin voltage | 1.24 | V | |||
−40°C to 85°C | 1.2028 | 1.2772 | ||||
VOUT_MAX | Maximum output voltage | 14 | V | |||
η | Efficiency | VIN = 3.6 V; VOUT = 5 V; ILOAD = 500 mA |
87% | |||
VIN = 2.5 V; VOUT = 3.3 V; ILOAD = 200 mA |
87% | |||||
D | Switch duty cycle | 17 | ||||
IDD | Operating quiescent current(2) | FB Pin > 1.3 V; EN Pin at VDD | 80 | µA | ||
FB Pin > 1.3 V; EN Pin at VDD, −40°C to 85°C | 110 | |||||
ISD | Shutdown quiescent current(3) | VDD, BOOT and SW Pins at 5 V; EN Pin < 200 mV |
0.01 | µA | ||
VDD, BOOT and SW Pins at 5 V; EN Pin < 200 mV, −40°C to 85°C |
2.5 | |||||
ICL | Switch peak current limit | LM2623A | 2.2 | 2. 85 | A | |
IC | Switch peak current limit | LM2623 | 1.2 | |||
RDS_ON | MOSFET switch on resistance | 0.17 | Ω | |||
−40°C to 85°C | 0.26 | |||||
ENABLE SECTION | ||||||
VEN_LO | EN pin voltage low(4) | −40°C to 85°C | 0.15 VDD | V | ||
VEN_HI | EN pin voltage high(4) | −40°C to 85°C | 0.7 VDD |
VOUT = 5 V |
VOUT = 5 V |