Specifications
| Type | Description |
|---|---|
| Part Number | LM27964 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | 24-pin WQFN, 4 mm x 4 mm x 0.8 mm, package number RTW0024A |
| LED drive efficiency | 87% peak; condition: LED drive operation |
| LED current matching | 0.2% typ, 2% max; condition: Bank A and Bank B current sink matching |
| Supported display LED count | 6 LEDs maximum; condition: Parallel white LEDs in two groups |
| Display LED current per channel | 30 mA max; condition: Each LED in Bank A or Bank B |
| Keypad LED driver current | 80 mA max; condition: Dedicated keypad LED driver |
| Total output current | 180 mA max; condition: Combined output current across LED banks |
| Input voltage range | 2.7 V to 5.5 V; condition: Operating rating |
| Recommended charge-pump input voltage range | 3.0 V to 5.5 V; condition: Charge pump operation |
| LED voltage range | 2.0 V to 4.0 V; condition: Operating rating |
| Charge pump gain modes | 1x and 3/2x; condition: Adaptive charge pump operation |
| Charge pump closed-loop output voltage | 4.6 V typ; condition: Closed-loop charge pump mode |
| Bank A or Bank B full-scale output current | 13.77 mA min, 15.3 mA typ, 16.83 mA max; condition: 3.0 V <= VIN <= 5.5 V, ENA or ENB = 1, ENK = 0, RSETA/RSETB = 16.9 kOhm |
| Bank A or Bank B half-scale output current | 7.5 mA typ; condition: 3.0 V <= VIN <= 5.5 V, Bank A or Bank B enabled, ENA or ENB = 1, ENK = 0 |
| Bank A or Bank B full-scale output current at low VIN | 15 mA typ; condition: 2.7 V <= VIN <= 3.0 V, ENA or ENB = 1, ENK = 0 |
| DKEY full-scale output current | 52.8 mA min, 60 mA typ, 67.2 mA max; condition: 3.0 V <= VIN <= 5.5 V, keypad driver enabled, ENA = ENB = 0, ENK = 1 |
| Bank A and DKEY simultaneous full-scale output current | 30 mA Bank A, 60 mA DKEY; condition: 3.2 V <= VIN <= 5.5 V, RSETA = 8.3 kOhm, RSETK = 16.9 kOhm, VLED = 3.6 V, ENA = ENK = 1, ENB = 0 |
| Open-loop charge pump output resistance, gain 3/2 | 2.75 Ohm typ; condition: Gain = 3/2 |
| Open-loop charge pump output resistance, gain 1 | 1 Ohm typ; condition: Gain = 1 |
| 1x to 3/2x gain transition threshold | 375 mV typ; condition: VDxA and/or VDxB falling, IDxx = 95% x IDxx nominal, IDxx nominal approximately 15 mA |
| Current source headroom voltage requirement | 180 mV typ; condition: Bank A and/or Bank B full-scale, gain = 3/2, ENA and/or ENB = 1, IDxx = 95% x IDxx nominal, IDxx nominal approximately 15 mA |
| DKEY current source headroom voltage requirement | 180 mV typ; condition: DKEY full-scale, gain = 3/2, ENK = 1, IDKEY = 95% x IDKEY nominal, IDKEY nominal approximately 60 mA |
| Quiescent supply current | 1.3 mA typ, 1.7 mA max; condition: Gain = 1.5x, no load |
| Shutdown supply current | 3.0 uA typ, 5 uA max; condition: All ENx bits = 0 |
| ISET pin voltage | 1.25 V typ; condition: 2.7 V <= VIN <= 5.5 V |
| Bank A and Bank B output current to current-set ratio | 200 typ; condition: IDxA-B / ISETA-B |
| DKEY output current to current-set ratio | 800 typ; condition: IDKEY / ISETK |
| Switching frequency | 500 kHz min, 700 kHz typ, 900 kHz max; condition: Charge pump switching operation |
| Start-up time | 250 us typ; condition: POUT = 90% steady state |
| Internal diode current PWM frequency, LM27964SQ-I | 10 kHz typ; condition: LM27964SQ-I variant |
| Internal diode current PWM frequency, LM27964SQ-C | 23 kHz typ; condition: LM27964SQ-C variant |
| Diode current duty cycle step | 1/16 full scale; condition: PWM brightness control step |
| Serial bus voltage level | 1.8 V to VIN; condition: SCL, SDIO, VIO interface |
| Input logic low voltage | 0 V min, 0.27 x VIO max; condition: 2.7 V <= VIN <= 5.5 V |
| Input logic high voltage | 0.73 x VIO min, VIO max; condition: 2.7 V <= VIN <= 5.5 V |
| Output logic low voltage | 400 mV max; condition: ILOAD = 2 mA |
| SCL clock period | 2.5 us min; condition: I2C compatible interface timing |
| Data input setup time to SCL high | 100 ns min; condition: I2C compatible interface timing |
| Data output stable after SCL low | 0 ns min; condition: I2C compatible interface timing |
| SDIO low setup time to SCL low | 100 ns min; condition: Start condition |
| SDIO high hold time after SCL high | 100 ns min; condition: Stop condition |
| Junction temperature operating range | -30 C to +100 C; condition: Operating rating |
| Ambient temperature operating range | -30 C to +85 C; condition: Operating rating |
| Junction-to-ambient thermal resistance | 41.3 C/W; condition: RTW0024A package |
| Datasheet Status | request_only |
Product Overview
The LM27964 is a Texas Instruments white LED charge-pump driver for Power_Management applications involving display and keypad LED drive. It supports a maximum of six parallel white display LEDs arranged in Bank A and Bank B, with each display LED channel rated up to 30 mA. A dedicated DKEY keypad LED driver supports up to 80 mA, while combined LED-bank output current is rated to 180 mA maximum.
The device operates over a 2.7 V to 5.5 V input voltage range, with a recommended 3.0 V to 5.5 V range for charge-pump operation. Its adaptive charge pump uses 1x and 3/2x gain modes, with a 4.6 V typical closed-loop output voltage, 700 kHz typical switching frequency, and 250 us typical start-up time to 90% steady state.
LM27964 is supplied in a 24-pin WQFN package, 4 mm x 4 mm x 0.8 mm, package number RTW0024A. Operating ratings include -30 C to +100 C junction temperature, -30 C to +85 C ambient temperature, and 41.3 C/W junction-to-ambient thermal resistance for the RTW0024A package.
Key Features
- 87% peak LED drive efficiency
- Supports up to six parallel display white LEDs
- 30 mA maximum current per display LED channel
- 80 mA maximum dedicated keypad LED driver current
- 180 mA maximum combined LED-bank output current
- Adaptive 1x and 3/2x charge-pump gain modes
- 4.6 V typical closed-loop charge-pump output voltage
- 700 kHz typical charge-pump switching frequency
- 0.2% typical Bank A and Bank B current matching
- 1.8 V to VIN serial bus voltage level
Typical Applications
- Display white LED drive
- Keypad LED illumination
- Parallel white LED groups
- Bank A and Bank B LED control
- I2C compatible LED control
- PWM brightness controlled LED outputs
Procurement Notes
When requesting a quote for LM27964, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
How many display LEDs can the LM27964 drive?
The LM27964 supports up to six parallel white display LEDs arranged in two groups, Bank A and Bank B. Each display LED channel is rated for 30 mA maximum current.
What input voltage range does LM27964 support?
The operating input voltage range is 2.7 V to 5.5 V. For charge-pump operation, the recommended input voltage range is 3.0 V to 5.5 V.
What charge-pump gain modes are available on LM27964?
The LM27964 uses adaptive charge-pump operation with 1x and 3/2x gain modes. In closed-loop charge-pump mode, the typical output voltage is 4.6 V.
What package is used for the LM27964?
The LM27964 is specified in a 24-pin WQFN package measuring 4 mm x 4 mm x 0.8 mm. The package number listed in the extracted facts is RTW0024A.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 25, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.