Datasheet

DS1842
76V, APD, Bias Output Stage with
Current Monitoring
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
FET ON-RESISTANCE vs. DRAIN CURRENT
DS1842 toc09
I
DS
(mA)
R
DSON
(Ω)
10010
4
5
6
7
3
1 1000
V
GS
= 2.5V
V
GS
= 3.0V
V
GS
= 3.6V
V
GS
= 5V
V
GS
= 10V
FET DRAIN CURRENT vs. DRAIN VOLTAGE
DS1842 toc10
DRAIN VOLTAGE (V)
I
DS
(mA)
321
100
200
300
400
500
600
700
0
04
V
GS
= 2.5V
V
GS
= 3.0V
V
GS
= 3.6V
V
GS
= 5V
V
GS
= 10V
Pin Description
PIN NAME FUNCTION
1 MIR1 Current Mirror Monitor Output, 10:1 Ratio
2 MIR2 Current Mirror Monitor Output, 5:1 Ratio
3 N.C.
No Connection. Can be connected to
GND for compatibility with the DS1842A.
4,
9–12
N.C.
No Connection. Not internally
connected.
5 CLAMP
Clamp Input. Disables the current mirror
output (MIROUT).
6 GATE FET Gate Connection
7 GND Ground
8 LX
FET Drain Connection. Connect to
switching inductor.
13 MIRIN Current Mirror Input
14 MIROUT
Current Mirror Output. Connect to APD
bias pin.
— EP Exposed Pad. Connect to ground.
Block Diagram
DS1842
LX
GATE
GND
MIRIN
MIR1
CLAMP
MIROUT
CURRENT MIRROR
CURRENT
LIMIT
MIR2
THERMAL
SHUTDOWN