LTC3890
[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 |
|---|---|---|
| LTC3890-1 | Analog Devices | — |
| LTC3890E | Analog Devices | — |
| LTC3890EUH | Analog Devices | — |
| LTC3890H | Analog Devices | — |
| LTC3890HUH | Analog Devices | — |
| LTC3890I | Analog Devices | — |
| LTC3890IUH | Analog Devices | — |
| LTC3890MP | Analog Devices | — |
| LTC3890MPUH | Analog Devices | — |
| LTC3890XIGN-1 | Analog Devices | — |
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