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LTC1553

ABSOLUTE MAXIMUM RATINGS

ORDER PART

NUMBER

(Note 1)

Supply Voltage

VCC ........................................................................ 9V

PVCC ................................................................... 20V

Input Voltage

IFB (Note 2)............................................ PVCC + 0.3V

IMAX ...................................................... – 0.3V to 13V

All Other Inputs ......................... – 0.3V to VCC + 0.3V

Digital Output Voltage ............................... – 0.3V to 13V

IFB Input Current (Notes 2, 3) .......................... – 100mA

Operating Temperature Range ..................... 0

°C to 70°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec.)................. 300

°C

PACKAGE/ORDER INFORMATION

VCC = 5V, PVCC = 12V, TA = 25°C, unless otherwise noted. (Note 3)

ELECTRICAL CHARACTERISTICS

Consult factory for Industrial and Military grade parts.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC

Supply Voltage

4.5

PVCC

Supply Voltage for G1, G2

VFB

Internal Feedback Voltage

(Note 4)

1.265

VOUT

1.8V Initial Output Voltage

With Respect to Rated Output Voltage (Figure 2)

– 27 (– 1.5%)

27 (+ 1.5%)

2.8V Initial Output Voltage

– 42 (– 1.5%)

42 (+ 1.5%)

3.5V Initial Output Voltage

– 52 (– 1.5%)

52 (+ 1.5%)

1.8V Initial Output Voltage

– 36 (– 2%)

36 (+ 2%)

2.8V Initial Output Voltage

– 56 (– 2%)

56 (+ 2%)

3.5V Initial Output Voltage

– 70 (– 2%)

70 (+ 2%)

∆VOUT

Output Load Regulation

IOUT = 0 to 14A (Note 4) (Figure 2)

– 5

Output Line Regulation

VIN = 4.75V to 5.25V, IOUT = 0 (Note 4)(Figure 2)

±1mV

VPWRGD

Positive Power Good Trip Point

% Above Output Voltage (Figure 2)

Negative Power Good Trip Point

% Below Output Voltage (Figure 2)

–7

–5

VFAULT

FAULT Trip Point

% Above Output Voltage (Figure 2)

ICC

Operating Supply Current

OUTEN = VCC = 5V (Note 5) (Figure 3)

800

1200

µA

Shutdown Supply Current

OUTEN = 0, VID0 to VID4 Floating (Figure 3)

130

250

µA

IPVCC

Supply Current

PVCC = 12V, OUTEN = VCC (Note 6) (Figure 3)

PVCC = 12V, OUTEN = 0, VID0 to VID4 Floating

µA

fOSC

Internal Oscillator Frequency

(Figure 4)

250

300

350

kHz

VSAWL

VCOMP at Minimum Duty Cycle

(Note 4)

1.8

VSAWH

VCOMP at Maximum Duty Cycle

(Note 4)

2.8

GERR

Error Amplifier Open-Loop DC Gain

(Note 7)

gmERR

Error Amplifier Transconductance

(Note 7)

0.9

1.6

2.3

millimho

BWERR

Error Amplifier –3dB Bandwidth

COMP = Open (Note 4)

400

kHz

TJMAX = 125°C, θJA = 100°C/ W (G)

TJMAX = 125°C, θJA = 100°C/ W (SW)

TOP VIEW

G PACKAGE

20-LEAD PLASTIC SSOP

SW PACKAGE

20-LEAD PLASTIC SO

PVCC

GND

SGND

VCC

SENSE

IMAX

IFB

COMP

OUTEN

VID0

VID1

VID2

VID3

VID4

PWRGD

FAULT

LTC1553CG

LTC1553CSW

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