Rainbow Electronics MAX17117 - Manual (Page 9)

Internal-Switch Boost Regulator with Integrated
7-Channel Scan Driver, Op Amp, and LDO
MAX17117
_______________________________________________________________________________________ 9
Pin Configuration
Pin Description
MAX17117
THIN QFN
TOP VIEW
29
30
28
27
12
11
13
CK4 CK2 CK1
ST
CK6
14
CK5
COMP POS OUT FB RO GHON
1
+
2
IN
4 5 6 7
23 24 22 20 19 18
LDOO
LDOADJ
CKH2
CKH3
CKH4
CKH5
CK3
OPAS
3
21
31 10 DTS CKH6
32 9 SS
EP
VGLC
ENA
26 15 CKH1 LX
25 16 STH
RE
VGL
8
17
PGND
PIN NAME FUNCTION
1–5, 7
CK5–CK1,
CK6
Level-Shifter Logic-Level Inputs
6 ST Start-Pulse, Level-Shifter Logic-Level Input
8 RE Gate-Shading Discharge for CKH2, CKH4, and CKH6
9 VGLC VGL Voltage Output
10–15 CKH6–CKH1 Level-Shifter Outputs
16 STH Start-Pulse Level-Shifter Output
17 VGL
Gate-Off Supply. VGL is the negative supply voltage for the STH, CKH1–CKH6, and VGLC high-volt-
age driver outputs. Bypass to PGND with a minimum of 0.1FF ceramic capacitor.
18 GHON
Gate-On Supply. GHON is the positive supply voltage for the STH, CKH1–CKH6, and VGLC high-
voltage scan-driver outputs. Bypass to PGND with a minimum of 0.1FF ceramic capacitor.
19 RO Gate-Shading Discharge for CKH1, CKH3, and CKH5
20 OUT Operational Amplifier Output
21 POS Operational Amplifier Noninverting Input
22 OPAS
Operational Amplifier Supply Input. Connect to V MAIN (Figure 1) and bypass to AGND with a 0.1FF or
greater ceramic capacitor.
23 COMP
Compensation for Error Amplifier. Connect a series RC from this pin to AGND. Typical values are
56kI and 1000pF.
24 FB
Step-Up Regulator Feedback. Reference voltage is 1.24V nominal. Connect the midpoint of an exter-
nal resistor-divider to FB and minimize trace area. Set V
MAIN according to V MAIN = 1.24V (1 + R1/R2).