MAX1640 Datasheet, PDF (2/11 Pages) Maxim Integrated Products – Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier

Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
ABSOLUTE MAXIMUM RATINGS
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 8.30mW/°C above +70°C) ................... 667mW
Operating Temperature Range
MAX164_EEE ...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................ +300°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.
ELECTRICAL CHARACTERISTICS
(V_IN = +12V, V_OUT = 6V, Circuit of Figure 2, T_A = 0°C to +85°C, unless otherwise noted. Typical values are at T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
Input Voltage Range
Linear-Regulator Output
Voltage, V_IN Referenced
V_IN
V_LDOH V_IN = 5.5V to 26V, I_LOAD = 0 to 20mA
Linear-Regulator Output
Voltage, Ground Referenced
V_LDOL V_IN = 5.5V to 26V, I_LOAD = 0 to 20mA
Full-Scale Current-Sense
Threshold
Quarter-Scale Current-Sense
Threshold
Current-Sense Line Regulation
Output Current Compliance
Quiescent V_IN Supply Current
Output Current in Off Mode
V_LDOL Undervoltage Lockout
Reference Voltage
Reference Load Regulation
V_SET Input Current
FET Drive Output Resistance
Off-Time Range
Off-Time Accuracy
Pulse-Trickle Mode Duty-Cycle
Period
MAX1640
MAX1641
MAX1640
MAX1641
V_IN = V_OUT + 0.5V to 26V
V_OUT = 2V to 24V
MAX1640
MAX1641
D0 or D1 = high
D0 = D1 = low (off mode)
D0 = D1 = low
V_REF
I_REF = 0 to 50µA
PFET and NFET drive
R_TOFF = 62kΩ
D0 = low, D1 = high, R_TOFF = 100kΩ
Pulse-Trickle Mode Duty Cycle
(Note 1)
D0 = low, D1 = high, R_TOFF = 100kΩ
MIN
5.5
V_IN -
5.5
4.5
142
147
36
34
4.05
1.96
1
1.7
27
TYP
V_IN -
5.0
5.0
150
150
42
37.5
0.03
0.1
0.1
2
500
4.20
2.00
4
2.2
33
MAX
26
V_IN -
4.5
UNITS
V
V
5.5
V
158
mV
153
48
mV
41
%/V
0.4
%/V
4
mA
µA
1
µA
4.35
V
2.04
V
10
mV
1
µA
12
Ω
10
µs
2.7
µs
40
ms
12.5
%
Note 1: This ratio is generated by a 1:8 clock divider and is not an error source for current calculations.
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