Specifications
| Type | Description |
|---|---|
| Part Number | LM27965 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | 24-pin WQFN, RTW0024A, 4 mm x 4 mm x 0.8 mm |
| Input Voltage Range | 2.7 to 5.5 V; operating rating; VIN pin |
| LED Voltage Range | 2.0 to 4.0 V; operating rating |
| Junction Temperature Range | -30 to +100 °C; operating rating |
| Ambient Temperature Range | -30 to +85 °C; operating rating |
| VIN Pin Absolute Maximum Voltage | -0.3 to 6.0 V; absolute maximum rating |
| SCL, SDIO, VIO, RESET Pin Voltage | -0.3 to VIN + 0.3 V, 6.0 V max; absolute maximum rating |
| Dxx Pin Voltage | -0.3 to POUT + 0.3 V, 6.0 V max; absolute maximum rating |
| Continuous Power Dissipation | Internally limited; absolute maximum rating |
| Maximum Junction Temperature | 150 °C; absolute maximum rating, TJ-MAX |
| Storage Temperature Range | -65 to +150 °C; absolute maximum rating |
| ESD Rating, Human Body Model | 2.0 kV; MIL-STD-883 3015.7 model |
| Thermal Resistance Junction-to-Ambient | 41.3 °C/W; RTW0024A package |
| Total LED Drive Current | 180 mA max; total output current across LED banks |
| Maximum Diode Current per Output | 30 mA; RSET = 8.33 kΩ; maximum total output current limited to 180 mA |
| Output Current Regulation, Bank A or Bank B | 18.2 mA min, 20.1 mA typ, 22.0 mA max; 3.0 V ≤ VIN ≤ 5.5 V; ENA='1' or ENB='1' and ENC='0'; RSET=12.7 kΩ |
| Output Current Regulation, Bank A or Bank B Accuracy | -9.5% to +9.5%; 3.0 V ≤ VIN ≤ 5.5 V; ENA='1' or ENB='1' and ENC='0' |
| Output Current Regulation, Bank C | 19.2 mA min, 20.8 mA typ, 22.4 mA max; 3.0 V ≤ VIN ≤ 5.5 V; ENC='1' and ENA=ENB='0'; RSET=12.7 kΩ |
| Output Current Regulation, Bank C Accuracy | -7.7% to +7.7%; 3.0 V ≤ VIN ≤ 5.5 V; ENC='1' and ENA=ENB='0' |
| Output Current Regulation with All Banks Enabled | 20 mA typ per DxA, DxB, and DxC output; 3.2 V ≤ VIN ≤ 5.5 V; VLED = 3.6 V; Bank A, Bank B, and Bank C enabled |
| LED Current Matching, Bank A | 0.3% typ, 1.7% max; 3.0 V ≤ VIN ≤ 5.5 V |
| LED Current Matching, Bank B | 0.3% typ, 1.4% max; 3.0 V ≤ VIN ≤ 5.5 V |
| Open-Loop Charge Pump Output Resistance, 3/2 Gain | 2.75 Ω typ; Gain = 3/2 |
| Open-Loop Charge Pump Output Resistance, 1x Gain | 1 Ω typ; Gain = 1 |
| 1x to 3/2x Gain Transition Threshold | 175 mV typ; VDxA and/or VDxB falling; RSET = 16.9 kΩ |
| Current Sink Headroom Voltage Requirement | 110 mV typ; IDxx = 95% x IDxx nominal; IDxx nominal approximately 15 mA; RSET = 16.9 kΩ |
| Quiescent Supply Current | 2.90 mA typ, 3.32 mA max; Gain = 1.5x, no load |
| Shutdown Supply Current | 3.4 µA typ, 5.4 µA max; all ENx bits = '0' |
| ISET Pin Voltage | 1.25 V typ; 2.7 V ≤ VIN ≤ 5.5 V |
| Output Current to Current Set Ratio | 200 typ; Bank A, Bank B, Bank C; IDxA-B-C / ISET |
| Switching Frequency | 0.89 MHz min, 1.27 MHz typ, 1.57 MHz max; charge pump switching frequency |
| Start-up Time | 250 µs typ; POUT = 90% steady state |
| Internal Diode Current PWM Frequency | 20 kHz typ; PWM dimming frequency |
| RESET Low Threshold | 0 to 0.45 V; 2.7 V ≤ VIN ≤ 5.5 V; reset state |
| RESET High Threshold | 1.2 V to VIN; 2.7 V ≤ VIN ≤ 5.5 V; normal operation |
| Serial Bus Voltage Level | 1.4 V to VIN; 2.7 V ≤ VIN ≤ 5.5 V; VIO pin |
| Input Logic Low Voltage | 0 to 0.3 x VIO V; 2.7 V ≤ VIN ≤ 5.5 V; VIO = 3.0 V; SCL/SDIO |
| Input Logic High Voltage | 0.7 x VIO to VIO V; 2.7 V ≤ VIN ≤ 5.5 V; VIO = 3.0 V; SCL/SDIO |
| Output Logic Low Voltage | 400 mV max; ILOAD = 3 mA; SDIO output low |
| SCL Clock Period | 2.5 µs min; I2C-compatible interface timing |
| Data Input Setup Time to SCL High | 100 ns min; I2C-compatible interface timing |
| Data Output Stable After SCL Low | 0 ns min; I2C-compatible interface timing |
| SDIO Low Setup Time to SCL Low | 100 ns min; start condition |
| SDIO High Hold Time After SCL High | 100 ns min; stop condition |
| Full-Scale LED Current Formula | 200 x (1.25 V / RSET); RSET connected between ISET and GND |
| LED Driver Outputs, Bank A | 5 outputs: D1A, D2A, D3A, D4A, D5A; Group A LED drivers |
| LED Driver Outputs, Bank B | 3 outputs: D1B, D2B, D3B; Group B LED drivers |
| LED Driver Outputs, Bank C | 1 output: D1C; indicator LED driver |
| I2C-Compatible Address Option, LM27965SQ | 0x36; device address option |
| I2C-Compatible Address Option, LM27965SQ-M | 0x38; device address option |
| Brightness Control Levels, Bank A and Bank B | 32 levels; I2C-compatible brightness control using analog and PWM methods |
| Brightness Control Levels, Bank C | 4 analog levels; indicator LED bank brightness control |
| Recommended External Capacitors | 1.0 µF each for CIN, COUT, C1, and C2; low-ESR surface-mount ceramic capacitors used for electrical characteristics and typical application |
| Datasheet Status | request_only |
Product Overview
The LM27965 is a Texas Instruments Power_Management IC for dual display white LED drive. Its LED outputs are organized as Bank A with five outputs, Bank B with three outputs, and Bank C with one indicator LED output. Full-scale LED current is set by an external resistor connected between ISET and GND using the formula 200 x (1.25 V / RSET).
Key Features
- 2.7 to 5.5 V VIN operating range
- 2.0 to 4.0 V LED voltage range
- 180 mA maximum total LED drive current
- Nine LED outputs across three banks
- 32 brightness levels for Bank A and Bank B
- 4 analog brightness levels for Bank C
- I2C-compatible address options 0x36 and 0x38
- 1.27 MHz typical charge pump switching frequency
- 250 µs typical start-up to 90% POUT
- 1.0 µF recommended capacitors for CIN, COUT, C1, C2
Typical Applications
- Dual display white LED drive
- Display backlight LED banks
- Indicator LED drive
- I2C-controlled brightness systems
- Charge pump LED supply designs
- Portable 2.7 to 5.5 V systems
Procurement Notes
When requesting a quote for LM27965, 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
What input voltage range does the LM27965 support?
The LM27965 operates from 2.7 to 5.5 V at the VIN pin. Its LED voltage operating range is 2.0 to 4.0 V, according to the extracted operating ratings.
How are the LM27965 LED outputs organized?
The device has three LED banks: Bank A provides five outputs, Bank B provides three outputs, and Bank C provides one indicator LED output. Total LED drive current is specified up to 180 mA.
How is full-scale LED current set?
Full-scale LED current is set by an RSET resistor connected between ISET and GND. The extracted formula is 200 x (1.25 V / RSET), with an output current to current set ratio of 200 typical.
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.