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MC34844
PIN CONNECTIONS
PIN CONNECTIONS
32
31
30
29
28
27
26
25
VIN 1
PGNDB 2
24 CK
23 VDC3
SWB 3
SWA 4
PGNDA 5
A0/SEN 6
EN 7
IO 8
TRANSPARENT
TOP VIEW
QFN - EP
5.0 MM X 5.0 MM
32 LEAD
EP GND
22 SLOPE
21 NIN
20 PIN
19 ISET
18 FAIL
17 I9
EP = Exposed Pad
9
I1
10
I2
11
I3
12
I4
13
I5
14
I6
15
I7
16
I8
Figure 4. 34844 Pin Connections
Table 2. 34844 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 14 .
Pin Number
1
2
3
4
5
6
7
8 - 17
18
Pin Name
VIN
PGNDB
SWB
SWA
PGNDA
A0/SEN
EN
I0-I9
FAIL
Pin Function
Power
Power
Input
Input
Power
Input
Input
Input
Open Drain
Formal Name
Input voltage
Power Ground
Switch node B
Switch node A
Power Ground
Device Select
Enable
LED Channel
Fault detection
Definition
Input supply
Power ground
Boost switch connection B
Boost switch connection A
Power ground
Address select, device select pin or OVP HW control
Enable pin (active high, internal pull-up)
LED string connections
Fault detected pin (open drain):
No Failure = Low-impedance
Failure = High-impedance
19
20
ISET
PIN
Passive
Input
Current set
Positive current scale
LED current setting resistor
Positive input analog current control
21
NIN
Input
Negative current scale Negative input analog current control
22
23
24
SLOPE
VDC3
CK
Passive
Output
Input/Output
Boost Slope
Internal Regulator 3
Clock signal
Boost slope compensation Setting resistor
Decoupling capacitor for internal phase locked loop power
Clock synchronization pin (input for M/~S = low - internal pull-up, output
for M/~S = high)
34844
Analog Integrated Circuit Device Data
Freescale Semiconductor
6
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