Datasheet LT1764A (Analog Devices) - 8

LT1764A Series
W U TYPICAL PERFOR A CE CHARACTERISTICS Current Limit Current Limit Reverse Output Current
6 6 5.0 VIN = 7V LT1764A-1.5 VOUT = 0V 4.5 5 5 LT1764A-1.8 4.0 TJ = –50°C LT1764A-2.5 3.5 4 4 LT1764A-3.3 3.0 LT1764A 3 TJ = 125°C 3 2.5 TJ = 25°C 2.0 TJ = 25°C VIN = 0V CURRENT LIMIT (A) 2 CURRENT LIMIT (A) 2 1.5 CURRENT FLOWS INTO OUTPUT PIN 1 1.0 1 REVERSE OUTPUT CURRENT (mA) VOUT = VADJ (LT1764A) 0.5 VOUT = VFB (LT1764A-1.5/1.8/-2.5/-3.3) 0 0 0 0 2 4 6 8 10 12 14 16 18 20 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 9 10 INPUT/OUTPUT DIFFERENTIAL (V) TEMPERATURE (°C) OUTPUT VOLTAGE (V) 1764 G27 1764 G28 1764 G29
Reverse Output Current Ripple Rejection Ripple Rejection
1.0 80 75 V V I OUT = 1.21V (LT1764A) IN = 0V L = 1.5A 0.9 VOUT = 1.5V (LT1764A-1.5) 70 VIN = VOUT(NOM) + 1V V + 0.5V 0.8 OUT = 1.8V (LT1764A-1.8) 70 P-P RIPPLE VOUT = 2.5V (LT1764A-2.5) 60 AT f = 120Hz 0.7 VOUT = 3.3V (LT1764A-3.3) 50 C 0.6 OUT = 100µF 65 LT1764A-1.5/1.8/-2.5/-3.3 TANTALUM + 0.5 40 10 × 1µF CERAMIC 0.4 30 60 0.3 LT1764A RIPPLE REJECTION (dB) 20 C RIPPLE REJECTION (dB) OUT = 10µF 0.2 I 55 L = 1.5A TANTALUM REVERSE OUTPUT CURRENT (mA) 10 VIN = VOUT(NOM) + 1V 0.1 + 50mVRMS RIPPLE 0 0 50 –50 –25 0 25 50 75 100 125 10 100 1k 10k 100k 1M –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) FREQUENCY (Hz) TEMPERATURE (°C) 1764 G31 1764 G30 1764 G32
LT1764A Minimum Input Voltage Load Regulation Output Noise Spectral Density
3.0 10 1 C √Hz) OUT = 10µF 5 ILOAD = 3A 2.5 µV/ I LT1764A L = 3A 0 2.0 I –5 L = 1.5A LT1764A-1.5 LT1764A-3.3 LT1764A-2.5 1.5 –10 LT1764A-1.8 0.1 IL = 500mA LT1764A-2.5 IL = 100mA –15 1.0 LT1764A-3.3 LT1764A LT1764A-1.8 LOAD REGULATION (mV) –20 ∆IL = 1mA TO 3A MINIMUM INPUT VOLTAGE (V) LT1764A-1.5 0.5 VIN = 2.7V (LT1764A/LT1764A-1.5) –25 VIN = VOUT(NOM) + 1V (LT1764A-1.8/-2.5/-3.3) 0 OUTPUT NOISE SPECTRAL DENSITY ( –30 0.01 –50 –25 0 25 50 75 100 125 – 50 – 25 0 25 50 75 100 125 10 100 1k 10k 100k TEMPERATURE (°C) TEMPERATURE (°C) FREQUENCY (Hz) 1764 G33 1764 G34 1764 G35 1764afb 8