Datasheet

MAX1652–MAX1655
High-Efficiency, PWM, Step-Down
DC-DC Controllers in 16-Pin QSOP
_______________________________________________________________________________________ 3
Note 1: Since the reference uses VL as its supply, V+ line-regulation error is insignificant.
Note 2: At very low input voltages, quiescent supply current may increase due to excessive PNP base current in the VL linear
regulator. This occurs if V+ falls below the preset VL regulation point (5V nominal).
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +15V, GND = PGND = 0V, SYNC = REF, I
VL
= I
REF
= 0A, T
A
= 0°C to +85°C, unless otherwise noted.)
SECFB, 0 or 4V
SHDN, 0 or 30V
SHDN, SKIP
SYNC
SYNC = 0 or 5V
SYNC = REF
Guaranteed by design, not tested
CSH = CSL = 5.5V
V+ = 4.5V, CSH = CSL = 4.0V (Note 2)
SYNC = 0 or 5V
Falling edge
0 < I
REF
< 100µA
SYNC = REF
SHDN = 0V, CSL = 5.5V, CSH = 5.5V, V+ = 0 or 30V,
VL = 0V
CONDITIONS
0.1
µA
3.0
No external load (Note 1)
Input Current
2.0
V
VL - 0.5
Input High Voltage
%
98 99
97 98
Dropout-Mode Maximum Duty
Cycle
kHz190 340Oscillator Sync Range
ns200SYNC Rise/Fall Time
ns200SYNC Low Pulse Width
ns200SYNC High Pulse Width
125 150 175
kHz
270 300 330
Oscillator Frequency
2.46 2.50 2.54
1 2Quiescent Power Consumption
1 8Dropout Power Consumption
5 15
V+ Shutdown Current
V2.0 2.4Reference Fault Lockout Voltage
mV15Reference Load Regulation
µA0.1 1
CSL, CSH Shutdown Leakage
Current
UNITSMIN TYP MAXPARAMETER
SHDN = 0V, V+ = 30V, CSL = 0 or 5.5V
FB = CSH = CSL = 5.5V, VL switched over to CSLV+ Off-State Leakage Current
DL forced to 2V
FB, FB = REF
CSH, CSL, CSH = CSL ≤ 4V
SYNC, SKIP
A1DL Sink/Source Current
±0.1
70
1.0
SHDN, SKIP
SYNC
0.5
V
0.8
Input Low Voltage
DH forced to 2V, BST - LX = 4.5V A1DH Sink/Source Current
High or low, BST - LX = 4.5V
High or low
Ω1.5 5DH On-Resistance
Ω1.5 5DL On-Resistance
Reference Output Voltage V
OSCILLATOR AND INPUTS/OUTPUTS
3 7
5 15
µA
µA
mW
mW