Product Summary

Features
Ultralow Quiescent Current: 2.8μA IQ Regulating 12VIN to 3.3VOUT
Fixed Output Voltages: 3.3V, 5V 2.1μA IQ Regulating 12VIN
Low Ripple Burst Mode? Operation: Output Ripple < 15mVP-P
Wide Input Voltage Range: 4.3V to 55V
1.2A Maximum Output Current
Adjustable Switching Frequency: 200kHz to 2MHz
Synchronizable Between 250kHz to 2MHz
Fast Transient Response
Accurate 1V Enable Pin Threshold
Low Shutdown Current: IQ = 700nA
Power Good Flag
Soft-Start CapabilityV
Internal Compensation
Saturating Switch Design: 0.44Ω On-Resistance
Output Voltage: 1.19V to 30V
Small Thermally Enhanced 10-Pin MSOP Package and (3mm × 3mm) DFN Packages



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Parametrics

Features
Ultralow Quiescent Current: 2.8μA IQ Regulating 12VIN to 3.3VOUT
Fixed Output Voltages: 3.3V, 5V 2.1μA IQ Regulating 12VIN
Low Ripple Burst Mode? Operation: Output Ripple < 15mVP-P
Wide Input Voltage Range: 4.3V to 55V
1.2A Maximum Output Current
Adjustable Switching Frequency: 200kHz to 2MHz
Synchronizable Between 250kHz to 2MHz
Fast Transient Response
Accurate 1V Enable Pin Threshold
Low Shutdown Current: IQ = 700nA
Power Good Flag
Soft-Start CapabilityV
Internal Compensation
Saturating Switch Design: 0.44Ω On-Resistance
Output Voltage: 1.19V to 30V
Small Thermally Enhanced 10-Pin MSOP Package and (3mm × 3mm) DFN Packages

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
LT3991IDD#PBF
LT3991IDD#PBF


IC REG BUCK ADJ 1.2A 10DFN

Data Sheet

0-1: $4.21
1-25: $2.81
25-100: $2.39
Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
LT3956EUHE#PBF
LT3956EUHE#PBF


IC LED DVR BUCK BOOST 36-VQFN

Data Sheet

0-1: $4.49
1-25: $3.00
25-100: $2.55
LT3956EUHE#TRPBF
LT3956EUHE#TRPBF


IC LED DVR BUCK BOOST 36-VQFN

Data Sheet

0-2500: $2.58
LT3956IUHE#PBF
LT3956IUHE#PBF


IC LED DVR BUCK BOOST 36-VQFN

Data Sheet

0-305: $3.00
LT3956IUHE#TRPBF
LT3956IUHE#TRPBF


IC LED DVR BUCK BOOST 36-VQFN

Data Sheet

0-2500: $3.03
LT3957AEUHE#PBF
LT3957AEUHE#PBF


IC REG MULTI CONFIG ADJ 5A 36QFN

Data Sheet

0-1: $3.77
1-25: $2.53
25-100: $2.15
LT3957AEUHE#TRPBF
LT3957AEUHE#TRPBF


IC REG MULTI CONFIG ADJ 5A 36QFN

Data Sheet

0-2500: $2.22