Manualshelf

Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - voltage regulator - special purpose TSSOP 38 EP
12345678910
LTC3876
7
3876f
TYPICAL PERFORMANCE CHARACTERISTICS
Phase Relationship:
PHASMD = Ground
(Forced Continuous Mode)
Phase Relationship:
PHASMD = Float
(Forced Continuous Mode)
Phase Relationship:
PHASMD = INTV
CC
(Forced Continuous Mode)
Overcurrent Protection
(Forced Continuous Mode)
Regular Soft Start-Up
(Forced Continuous Mode)
Short-Circuit Protection
(Forced Continuous Mode)
Soft Start-Up Into
Prebiased Output
Overvoltage Protection
(Forced Continuous Mode)
Output Tracking
(Forced Continuous Mode)
V
IN
5V/DIV
VDDQ
500mV/DIV
VTT
500mV/DIV
2ms/DIV
3876 G10
C
SS
= 10nF
V
IN
= 12V
VDDQ = 1.5V, VTT = 0.75V
FIGURE 10 CIRCUIT
TRACK/SS
200mV/DIV
VTT
500mV/DIV
1ms/DIV
3876 G11
CSS = 10nF
V
IN
= 12V
VDDQ = 1.5V, VTT = 0.75V
VDDQ PREBIASED TO 0.75V
VTT PREBIASED TO 0.6V
FIGURE 10 CIRCUIT
RUN
5V/DIV
VDDQ
500mV/DIV
TRACK/SS
200mV/DIV
TRACK/SS
200mV/DIV
VTT
500mV/DIV
VDDQ
500mV/DIV
10ms/DIV
3876 G12
V
IN
= 12V
VDDQ = 1.5V, VTT - 0.75V
FIGURE 10 CIRCUIT
500ns/DIV
0°
3876 G17
PHASMD = FLOAT
V
IN
= 6V
VDDQ = 1.5V, VTT = 0.75V
LOAD = 0A
FIGURE 10 CIRCUIT
CLKOUT
5V/DIV
SW2
5V/DIV
SW1
5V/DIV
PLLIN
5V/DIV
90°
180°
500ns/DIV
0°
3876 G18
PHASMD = INTV
CC
V
IN
= 6V
VDDQ = 1.5V, VTT = 0.75V
LOAD = 0A
FIGURE 10 CIRCUIT
CLKOUT
5V/DIV
SW2
5V/DIV
SW1
5V/DIV
PLLIN
5V/DIV
120°
240°
V
OUT
50mV/DIV
LOAD
CURRENT
20A/DIV
5ms/DIV
3876 G13
V
IN
= 12V
VDDQ = 1.5V
CURRENT LIMIT = 23A
OVERLOAD = 10A TO 17.5A
FICURE 10 CIRCUIT, VDDQ CHANNEL 1
I
L
10A/DIV
10A
FULL CURRENT LIMIT V
OUT
GREATER
THAN HALF REGULATED SETTING
24A
V
OUT
1V/DIV
50A
0A
500µs/DIV
3876 G14
V
IN
= 12V
VDDQ = 1.5V
I
LOAD
= 0A, SHORT = 50A
FIGURE 10 CIRCUIT,
VDDQ CHANNEL 1
CURRENT LIMIT
FOLDBACK V
OUT
DROPS BELOW
HALF REGULATED
SET POINT
I
L
20A/DIV
SHORT-
CIRCUIT
TRIGGER
1V/DIV
C
OUT
DISCHARGE
C
OUT
RECHARGE
20µs/DIV
OVERVOLTAGE
CREATED BY
APPLYING A
CHARGED
CAPACITOR
TO V
OUT
BG STAYS
ON UNTIL V
OUT
PULLED BELOW
OVERVOLTAGE
THRESHOLD
3876 G15
V
IN
= 12V
VDDQ = 1.5V
I
LOAD
= 0A
FIGURE 10 CIRCUIT,
VDDQ CHANNEL 1
BG1
5V/DIV
V
OUT
200mV/DIV
I
L
20A/DIV
500ns/DIV
60°
0°
3876 G16
PHASMD = GND
V
IN
= 6V
VDDQ = 1.5V, VTT = 0.75V
LOAD = 0A
FIGURE 10 CIRCUIT
CLKOUT
5V/DIV
SW2
5V/DIV
SW1
5V/DIV
PLLIN
5V/DIV
180°