LTC1436A_15 Datasheet, PDF (3/28 Pages) Linear Technology – High Efficiency Low Noise Synchronous Step-Down Switching Regulators

LTC1436A
LTC1436A-PLL/LTC1437A
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 15V, V_RUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
V_LINEREG
Reference Voltage Line Regulation
V_IN = 3.6V to 20V (Note 3), V_PROG Pin Open
0.002 0.01
%/V
V_LOADREG
Output Voltage Load Regulation
I_TH Sinking 5µA (Note 3)
I_TH Sourcing 5µA (Note 3)
●
0.5
0.8
%
●
– 0.5 – 0.8
%
V_SFB
Secondary Feedback Threshold
V_SFB Ramping Negative
● 1.16 1.19 1.22
V
I_SFB
Secondary Feedback Current
V_SFB = 1.5V
–1
–2
µA
V_OVL
Output Overvoltage Lockout
V_PROG Pin Open
1.24 1.28 1.32
V
I_PROG
V_PROG Input Current
0.5V > V_PROG
INTV_CC – 0.5V < V_PROG < INTV_CC
–3
–6
µA
3
6
µA
I_Q
Input DC Supply Current
Normal Mode
Shutdown
EXTV_CC = 5V (Note 4)
3.6V < V_IN < 30V, V_AUXON = 0V
V_RUN/SS = 0V, 3.6V < V_IN < 15V
280
µA
16
25
µA
V_RUN/SS
RUN Pin Threshold
● 0.8
1.3
2
V
I_RUN/SS
Soft Start Current Source
V_RUN/SS = 0V
1.5
3
4.5
µA
∆V_SENSE(MAX) Maximum Current Sense Threshold
t _ON(MIN)
Minimum On-Time
V_CM = 0V, 5V, V_PROG Pin Open
Tested with Square Wave, SENSE ^– = 1.6V,
∆V_SENSE = 20mV (Note 7)
130 150 180
mV
250 300
ns
TGL t_r
TGL t_f
TGL Transition Time
Rise Time
Fall Time
C_LOAD = 3000pF
C_LOAD = 3000pF
50
150
ns
50
150
ns
TGS Transition Time
TGS t_r
TGS t_f
Rise Time
Fall Time
C_LOAD = 500pF
C_LOAD = 500pF
90
200
ns
50
150
ns
BG Transition Time
BG t_r
Rise Time
BG t_f
Fall Time
C_LOAD = 3000pF
C_LOAD = 3000pF
50
150
ns
40
150
ns
Internal V_CC Regulator
V_INTVCC
Internal V_CC Voltage
6V < V_IN < 30V, V_EXTVCC = 4V
● 4.8
5.0
5.2
V
V_LDO INT
INTV_CC Load Regulation
I_INTVCC = 15mA, V_EXTVCC = 4V
– 0.2
–1
%
V_LDO EXT
EXTV_CC Voltage Drop
I_INTVCC = 15mA, V_EXTVCC = 5V
130 230
mV
V_EXTVCC
EXTV_CC Switchover Voltage
I_INTVCC = 15mA, V_EXTVCC Ramping Positive
●
4.5
4.7
V
Oscillator and Phase-Locked Loop
f_OSC
Oscillator Frequency
VCO High
R_PLLIN
I_PLLLPF
PLL IN Input Resistance
Phase Detector Output Current
Sinking Capability
Sourcing Capability
Power-On Reset
C_OSC = 100pF, LTC1436 (Note 5),
LTC1436A-PLL/LTC1437A, V_PLLLPF = 0V
LTC1436A-PLL/LTC1437A, V_PLLLPF = 2.4V
f_PLLIN < f_OSC
f_PLLIN > f_OSC
112
125
138
kHz
200 240
kHz
50
kΩ
10
15
20
µA
10
15
20
µA
V_SATPOR
I_LPOR
V_THPOR
t _DPOR
POR Saturation Voltage
POR Leakage
POR Trip Voltage
POR Delay
I_POR = 1.6mA, V_OSENSE = 1V, V_PROG Pin Open
V_POR = 12V, V_OSENSE = 1.2V, V_PROG Pin Open
V_PROG Pin Open, V_OSENSE Ramping Negative
V_PROG Pin Open
0.6
1
0.2
1
– 11 – 7.5 – 4
65536
V
µA
%
Cycles
14367afb
3