The LM2775 is a regulated switched-capacitor doubler that produces a low-noise output voltage. The LM2775 can supply up to 200 mA of output current over a 3.1-V to 5.5-V input range, as well as up to 125 mA of output current when the input voltage is as low as 2.7 V. At low output currents, the LM2775 can reduce its quiescent current by operating in a pulse frequency modulation (PFM) mode. PFM mode can be enabled or disabled by driving the PFM pin to high or low. Additionally, when the LM2775 is in shutdown, the user can chose to have the output voltage pulled to GND or left in a high impedance state by setting the OUTDIS pin high or low.
The LM2775 has been placed in TI's 8-pin WSON, a package with excellent thermal properties that keeps the part from overheating under almost all rated operating conditions.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM2775 | WSON (8) | 2.00 mm × 2.00 mm |
DATE | REVISION | NOTES |
---|---|---|
May 2015 | * | Initial release. |
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | PFM | I | PFM mode enable. Allow or disallow PFM operation. 1 = PFM enabled, 0 = PWM disabled |
2 | C1– | P | Flying capacitor pin |
3 | C1+ | P | Flying capacitor pin |
4 | OUTDIS | I | Output disconnect option. 1 = Active output discharge during shutdown, 0 = High impedance output without pull-down during shutdown. |
5 | EN | I | Chip enable. 1 = Enabled, 0 = Disabled |
6 | VOUT | O | Charge pump output |
7 | VIN | P | Input voltage |
8 | GND | G | Ground |
Thermal Pad | GND | GND | Connect to GND |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VIN, VOUT | –0.3 | 6 | V | |
EN, OUTDIS, PFM | –0.3 | VIN + 0.3 with 6 V Max | V | |
Continuous power dissipation | Internally Limited | °C | ||
Junction temperature (TJ-MAX) | 125 | °C | ||
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±1000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±250 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
VIN | 2.7 | 5.5 | V | ||
Junction temperature (TJ ) | –40 | 125 | °C | ||
Ambient temperature (TA ) | –40 | 85 | °C |
THERMAL METRIC(1) | LM2775 | UNIT | |
---|---|---|---|
DSG (WSON) | |||
8 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 71.6 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 95.0 | |
RθJB | Junction-to-board thermal resistance | 41.5 | |
ψJT | Junction-to-top characterization parameter | 3.2 | |
ψJB | Junction-to-board characterization parameter | 41.8 | |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 12.8 |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
VOUT | Output voltage regulation | IOUT = 180 mA | 4.8 | 5 | 5.2 | V |
IQ | Quiescent current | IOUT = 0 mA, PFM = ‘1’ | 75 | 150 | µA | |
IOUT = 0 mA, PFM = ‘0’ | 5 | mA | ||||
ISD | Shutdown current | EN = '0' | 0.7 | 3 | µA | |
IOUTDIS | Output discharge current | OUTDIS = '1' | 500 | µA | ||
ICL | Input current limit | 600 | mA | |||
VIL | Input logic low: EN, OUTDIS, PFM | 0 | 0.4 | V | ||
VIH | Input logic high: EN, OUTDIS, PFM | 1.2 | VIN | V | ||
UVLO | Undervoltage lockout | VIN falling | 2.4 | V | ||
VIN rising | 2.6 |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
ƒSW | Switching frequency | 1.7 | 2 | 2.3 | MHz |
ILOAD = 200 mA | PFM = '0' | |
ILOAD = 200 mA | PFM = '1' | |
VIN = 3.3 V | PFM = '0' |
VIN = 2.7 V | PFM = '0' |
EN = '0' | OUTDIS = '0' |
ILOAD = 0 mA | PFM = '0' |
ILOAD = 100 mA | PFM = '0' |
VIN = 3.3 V | PFM = '1' |
VIN = 3.6 V | ILOAD = 1 mA to 100 mA | PFM = '0' |
VIN = 3.6 V | OUTDIS = '1' |
VIN = 3.3 V | PFM = '1' |
EN = '0' |
ILOAD = 0 mA | PFM = '1' |
VIN = 3.3 V | PFM = '0' |
VIN = 3.6 V | ILOAD = 1 mA to 100 mA | PFM = '1' |
VIN = 3.6 V | OUTDIS = '0' | |
VIN = 3.6 V | ILOAD = 100 mA |