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LTC1438 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC1438
Description  Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1438 Datasheet(HTML) 3 Page - Linear Technology

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LTC1438/LTC1439
ELECTRICAL CHARACTERISTICS T
A = 25°C, VIN = 15V, VRUN/SS1,2 = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loops
IIN VOSENSE1,2 Feedback Current
VPROG1, VPROG2 Pins Open (Note 2)
10
50
nA
VOUT1,2
Regulated Output Voltage
(Note 2)
1.19V (Adjustable) Selected
VPROG1, VPROG2 Pins Open
q
1.178
1.19
1.202
V
3.3V Selected
VPROG1, VPROG2 = 0V
q
3.220
3.30
3.380
V
5V Selected
VPROG1, VPROG2 = INT VCC
q
4.900
5.00
5.100
V
VLINEREG1,2
Reference Voltage Line Regulation
VIN = 3.6V to 20V (Note 2), VPROG1,2 Pins Open
0.002
0.01
%/V
VLOADREG1,2
Output Voltage Load Regulation
ITH1,2 Sinking 5µA (Note 2)
q
0.5
0.8
%
ITH1,2 Sourcing 5µA
q
– 0.5
– 0.8
%
VSFB1
Secondary Feedback Threshold
VSFB1 Ramping Negative
q
1.16
1.19
1.22
V
ISFB1
Secondary Feedback Current
VSFB1 = 1.5V
– 1
– 2
µA
VOVL
Output Overvoltage Lockout
VPROG1,2, SENSE 1 and VOSENSE1,2 Pins Open
1.24
1.28
1.32
V
IPROG1,2
VPROG1,2 Input Current
0.5V > VPROG1,2
–3
– 6
µA
INTVCC – 0.5V < VPROG1,2 < INTVCC
3
6
µA
IQ
Input DC Supply Current
EXTVCC = 5V (Note 3)
Normal Mode
3.6V < VIN < 30V, VAUXON = 0V
320
µA
Shutdown
VRUN/SS1,2 = 0V, 3.6V < VIN < 15V
16
30
µA
VRUN/SS1,2
Run Pin Threshold
q
0.8
1.3
2
V
IRUN/SS1,2
Soft Start Current Source
VRUN/SS1,2 = 0V
1.5
3
4.5
µA
∆VSENSE(MAX) Maximum Current Sense Threshold
VOSENSE1,2 = 0V, 5V VPROG1,2 = Pins Open
130
150
180
mV
TGL1, 2 tr, tf
TGL1, TGL2 Transition Time
Rise Time
CLOAD = 3000pF
50
150
ns
Fall Time
CLOAD = 3000pF
50
150
ns
TGS1, 2 tr, tf
TGS1, TGS2 Transition Time
Rise Time
CLOAD = 500pF
100
150
ns
Fall Time
CLOAD = 500pF
50
150
ns
BG1, 2 tr, tf
BG1, BG2 Transition Time
Rise Time
CLOAD = 3000pF
50
150
ns
Fall Time
CLOAD = 3000pF
50
150
ns
Internal VCC Regulator
VINTVCC
Internal VCC Voltage
6V < VIN < 30V, VEXTVCC = 4V
q
4.8
5.0
5.2
V
VLDO INT
INTVCC Load Regulation
IINTVCC = 20mA, VEXTVCC = 4V
– 0.2
– 1
%
VLDO EXT
EXTVCC Voltage Drop
IINTVCC = 20mA, VEXTVCC = 5V
170
300
mV
VEXTVCC
EXTVCC Switchover Voltage
IINTVCC = 20mA, EXTVCC Ramping Positive
q
4.5
4.7
V
Oscillator and Phase-Locked Loop
fOSC
Oscillator Frequency
COSC = 100pF, LTC1439: PLL LPF = 0V (Note 4)
112
125
138
kHz
VCO High
LTC1439, VPLLLPF = 2.4V
200
240
kHz
RPLLIN
PLLIN Input Resistance
50
k
IPLLLPF
Phase Detector Output Current
LTC1439
Sinking Capability
fPLLIN < fOSC
10
15
20
µA
Sourcing Capability
fPLLIN > fOSC
10
15
20
µA
Power-On Reset
VSATPOR2
POR2 Saturation Voltage
IPOR2 = 1.6mA, VOSENSE2 = 1V,
0.6
1
V
VPROG2 Pin Open
ILPOR2
POR2 Leakage
VPOR2 = 12V, VOSENSE2 = 1.2V, VPROG2 Pin Open
0.2
1
µA
VTHPOR2
POR2 Trip Voltage
VPROG2 Pin Open % of VREF
VOSENSE2 Ramping Negative
– 11
– 7.5
– 4
%
tDPOR2
POR2 Delay
VPROG2 Pin Open
65536
Cycles


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