LTC3890I
[LTC3890](https://www.analog.com/LTC3890?doc=LTC3890.pdf)
Manufacturer
Analog Devices
Overview
Part: LTC3890 from Analog Devices
Type: High performance dual step-down switching regulator DC/DC controller
Key Specs:
- Wide VIN Range: 4V to 60V
- Low Operating IQ: 50μA (One Channel On)
- Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
- Phase-Lockable Frequency: 75kHz to 850kHz
- Programmable Fixed Frequency: 50kHz to 900kHz
- Low Shutdown IQ: < 14μA
- Very Low Dropout Operation: 99% Duty Cycle
Features:
- RSENSE or DCR Current Sensing
- Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
- Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads
- Selectable Current Limit
- Adjustable Output Voltage Soft-Start or Tracking
- Power Good Output Voltage Monitors
- Output Overvoltage Protection
- Internal LDO Powers Gate Drive from VIN or EXTVCC
- No Current Foldback During Start-Up
- AEC-Q100 Qualified for Automotive Applications
Applications:
- Automotive Always-On Systems
- Battery Operated Digital Devices
- Distributed DC Power Systems
Package:
- 32-Lead (5mm × 5mm) Plastic QFN: 5mm × 5mm (0.75mm profile)
Features
- n Wide VIN Range: 4V to 60V (65V Abs Max)
- n Low Operating IQ: 50μA (One Channel On)
- n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
- n RSENSE or DCR Current Sensing
- n Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
- n Phase-Lockable Frequency (75kHz to 850kHz)
- n Programmable Fixed Frequency (50kHz to 900kHz)
- n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads
- n Selectable Current Limit
- n Very Low Dropout Operation: 99% Duty Cycle
- n Adjustable Output Voltage Soft-Start or Tracking
- n Power Good Output Voltage Monitors
- n Output Overvoltage Protection
- n Low Shutdown IQ : < 14μA
- n Internal LDO Powers Gate Drive from VIN or EXTVCC
- n No Current Foldback During Start-Up
- n Small Low Profile (0.75mm) 5mm × 5mm QFN Package
- n AEC-Q100 Qualified for Automotive Applications
Applications
- n Automotive Always-On Systems
- n Battery Operated Digital Devices
- n Distributed DC Power Systems
Pin Configuration
Electrical Characteristics
The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted. (Note 2)
| SYMBOL | PARAMETER | CONDITIONS | MIN | TYP | MAX | UNITS | |
|---|---|---|---|---|---|---|---|
| VIN | Input Supply Operating Voltage Range | 4 | 60 | V | |||
| VFB1,2 | Regulated Feedback Voltage | (Note 4) ITH1,2 Voltage = 1.2V –40°C to 85°C, All Grades LTC3890E, LTC3890I LTC3890H, LTC3890MP | l l | 0.792 0.788 0.786 | 0.800 0.800 0.800 | 0.808 0.812 0.812 | V V V |
| IFB1,2 | Feedback Current | (Note 4) | ±5 | ±50 | nA | ||
| VREFLNREG | Reference Voltage Line Regulation | (Note 4) VIN = 4.5V to 60V | 0.002 | 0.02 | %/V | ||
| VLOADREG | Output Voltage Load Regulation | (Note 4) Measured in Servo Loop, ∆ITH Voltage = 1.2V to 0.7V | l | 0.01 | 0.1 | % | |
| (Note 4) Measured in Servo Loop, ∆ITH Voltage = 1.2V to 2V | l | –0.01 | –0.1 | % | |||
| gm1,2 | Transconductance Amplifier gm | (Note 4) ITH1,2 = 1.2V, Sink/Source = 5μA | 2 | mmho | |||
| IQ | Input DC Supply Current | (Note 5) | |||||
| Pulse-Skipping or Forced Continuous Mode (One Channel On) | RUN1 = 5V and RUN2 = 0V, VFB1 = 0.83V or RUN1 = 0V and RUN2 = 5V, VFB2 = 0.83V | 1.3 | mA | ||||
| Pulse-Skipping or Forced Continuous Mode (Both Channels On) | RUN1,2 = 5V, VFB1,2 = 0.83V (No Load) | 2 | mA | ||||
| Sleep Mode (One Channel On) | RUN1 = 5V and RUN2 = 0V, VFB1 = 0.83V (No Load) or RUN1 = 0V and RUN2 = 5V, VFB2 = 0.83V (No Load) | 50 | 75 | μA | |||
| Sleep Mode (Both Channels On) | RUN1,2 = 5V, VFB1,2 = 0.83V (No Load) | 60 | 100 | μA | |||
| Shutdown | RUN1,2 = 0V | 14 | 25 | μA | |||
| UVLO | Undervoltage Lockout | INTVCC Ramping Up INTVCC Ramping Down | l l | 3.6 | 3.92 3.80 | 4.2 4.0 | V V |
| Feedback Overvoltage Protection | Measured at VFB1,2, Relative to Regulated VFB1,2 | 7 | 10 | 13 | % | ||
| ISENSE+ | SENSE+ Pin Current | Each Channel | ±1 | μA | |||
| ISENSE– | SENSE– Pins Current | Each Channel VSENSE– < INTVCC – 0.5V VSENSE– > INTVCC + 0.5V | 700 | ±1 | μA μA | ||
| Maximum TG1, 2 Duty Factor | In Dropout | 98 | 99 | % | |||
| ITRACK/SS1,2 | Soft-Start Charge Current | VTRACK/SS1,2 = 0V | 0.7 | 1.0 | 1.4 | μA | |
| VRUN1 VRUN2 | RUN1 Pin On Threshold RUN2 Pin On Threshold RUN1,2 Pin Hysteresis | VRUN1 Rising VRUN2 Rising | l l | 1.15 1.20 | 1.21 1.25 50 | 1.27 1.30 | V V mV |
| VSENSE(MAX) | Maximum Current Sense Threshold | VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = 0 VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = INTVCC VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = FLOAT | l l l | 22 43 64 | 30 50 75 | 36 57 85 | mV mV mV |
| Gate Driver | TG1,2 Pull-Up On-Resistance TG1,2 Pull-Down On-Resistance BG1,2 Pull-Up On-Resistance BG1,2 Pull-Down On-Resistance | 2.5 1.5 2.4 1.1 | Ω Ω Ω Ω | ||||
| TG1,2 tr TG1,2 tf | TG Transition Time: Rise Time Fall Time | (Note 6) CLOAD = 3300pF CLOAD = 3300pF | 25 16 | ns ns | |||
| BG1,2 tr BG1,2 tf | BG Transition Time: Rise Time Fall Time | (Note 6) CLOAD = 3300pF CLOAD = 3300pF | 28 13 | ns ns |
Absolute Maximum Ratings
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| LTC3890 | Analog Devices | — |
| LTC3890-1 | Analog Devices | — |
| LTC3890E | Analog Devices | — |
| LTC3890EUH | Analog Devices | — |
| LTC3890H | Analog Devices | — |
| LTC3890HUH | Analog Devices | — |
| LTC3890IUH | Analog Devices | — |
| LTC3890MP | Analog Devices | — |
| LTC3890MPUH | Analog Devices | — |
| LTC3890XIGN-1 | Analog Devices | — |
Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.
Get structured datasheet data via API
Get started free