Datasheet

Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +12V, V
OUT
= 6V, Circuit of Figure 1, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN to GND ...............................................................-0.3V to +28V
LDOH to IN ...............................................................+0.3V to -6V
LDOL to GND ...........................................................-0.3V to +6V
PDRV to GND .............................. (V
LDOH
- 0.3V) to (V
IN
+ 0.3V)
NDRV to GND .........................................-0.3V to (V
LDOL
+ 0.3V)
TOFF, REF, SET, TERM, CC to GND ......-0.3V to (V
LDOL
+ 0.3V)
D0, D1 to GND .........................................................-0.3V to +6V
CS+, CS- to GND ...................................................-0.3V to +28V
PGND to GND.....................................................................±0.3V
Continuous Power Dissipation (T
A
= +70°C)
QSOP (derate 9.6mW/°C above +70°C)..................... 772mW
Package Junction-to-Ambient Thermal Resistance (
θ
JA
)
(Note 1) ..................................................................103.7°C/W
Package Junction-to-Case Thermal Resistance θ
JC
)
(Note1) ....................................................................... 37°C/W
Operating Temperature Range
MAX164_EEE...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................ +300°C
I
REF
= 0 to 50µA
D0 = D1 = low
D0 = D1 = low (off mode)
D0 or D1 = high
V
OUT
= 2V to 24V
V
IN
= V
OUT
+ 0.5V to 26V
MAX1641
MAX1641
MAX1640
V
IN
= 5.5V to 26V, I
LOAD
= 0 to 20mA
V
IN
= 5.5V to 26V, I
LOAD
= 0 to 20mA
MAX1640
CONDITIONS
µA1V
SET
Input Current
mV410Reference Load Regulation
V1.96 2.00 2.04V
REF
Reference Voltage
V4.05 4.20 4.35V
LDOL
Undervoltage Lockout
µA1Output Current in Off Mode
500
mA24
Quiescent V
IN
Supply Current
0.1
%/V
0.1 0.4
Output Current Compliance
%/V0.03Current-Sense Line Regulation
34 37.5 41
mV
36 42 48
147 150 153
mV
142 150 158
Full-Scale Current-Sense
Threshold
V
V
IN
-V
IN
-V
IN
-
5.5 5.0 4.5
V
LDOH
Linear-Regulator Output
Voltage, V
IN
Referenced
V4.5 5.0 5.5V
LDOL
Linear-Regulator Output
Voltage, Ground Referenced
UNITSMIN TYP MAXSYMBOLPARAMETER
V5.5 26V
IN
Input Voltage Range
FET Drive Output Resistance PFET and NFET drive 12 Ω
Off-Time Range 110µs
Off-Time Accuracy R
TOFF
= 62kΩ 1.7 2.2 2.7 µs
Pulse-Trickle Mode Duty-Cycle
Period
D0 = low, D1 = high, R
TOFF
= 100kΩ 27 33 40 ms
Pulse-Trickle Mode Duty Cycle
(Note 2)
D0 = low, D1 = high, R
TOFF
= 100kΩ 12.5 %
Quarter-Scale Current-Sense
Threshold
MAX1640
MAX1641
µA
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal comsiderations, refer to www.maxim-ic.com/thermal-tutorial
.
MAX1640/MAX1641
2
Maxim Integrated