MAX8630WETD20+T Maxim Integrated Products, MAX8630WETD20+T Datasheet - Page 6

• Manufacturer Part Number: MAX8630WETD20+T
• Description: IC LED DRVR WHITE BCKLGT 14-TDFN
• Manufacturer: Maxim Integrated Products
• Type: Backlight, White LEDr

Specifications of MAX8630WETD20+T

• Constant Current: Yes
• Topology: PWM, Switched Capacitor (Charge Pump)
• Number Of Outputs: 5
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 1MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Voltage - Output: 5V
• Mounting Type: Surface Mount
• Package / Case: 14-TDFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 25mA
• Internal Switch(s): Yes
• Efficiency: 93%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

125mA 1x/1.5x Charge Pumps for 5 White LEDs
in 3mm x 3mm TDFN
6
_______________________________________________________________________________________
M A X8 6 3 0 X
10
11
12
13
14
—
—
—
5
6
7
8
9
PIN
M A X8 6 3 0 W
10
11
12
13
14
—
—
—
5
6
7
8
9
C P W M
N A M E
LE D 5
LE D 4
LE D 3
LE D 2
LE D 1
P WM
E N M
O U T
E N S
C 2P
C 1P
E P
Tr ansfer C ap aci tor 2 P osi ti ve C onnecti on. C onnect a 1µF cer am i c cap aci tor
fr om C 2P to C 2N .
Tr ansfer C ap aci tor 1 P osi ti ve C onnecti on. C onnect a 1µF cer am i c cap aci tor
fr om C 1P to C 1N .
O utp ut. C onnect a 1µF cer am i c cap aci tor fr om O U T to G N D . C onnect OU T to
the anod es of al l the LE D s. In shutd ow n, OU T i s p ul l ed d ow n b y an i nter nal
5kΩ r esi stor .
E nab l e and D i m m i ng C ontr ol for S ub LE D s ( LE D 4 and LE D 5) . D r i ve E N S l og i c-
l ow for g r eater than 4m s to d i sab l e the sub LE D s. D r i ve b oth E N M and E N S
l og i c- l ow for g r eater than 4m s to shut d ow n the IC . D r i ve E N S l og i c- hi g h to
b eg i n soft- star t and enab l e m axi m um ( 100% ) sub LE D cur r ent. S ub seq uent
p ul ses on E N S cause the sub LE D cur r ent to d ecr ease i n 32 l i near step s.
Because of the soft- star t d el ay, i t i s p ossi b l e to tur n on the IC and q ui ckl y set a
d i m l evel so the sub LE D cur r ent never tr ansi ti ons thr oug h the m axi m um
setti ng . S ee the E N M /E N S D i m m i ng C ontr ol secti on.
E nab l e and D i m m i ng C ontr ol for M ai n LE D s ( LE D 1, LE D 2, and LE D 3) . D r i ve
E N M l og i c- l ow for g r eater than 4m s to d i sab l e the m ai n LE D s. D r i ve b oth E N M
and E N S l og i c- l ow for g r eater than 4m s to shut d ow n the IC . D r i ve E N M l og i c-
hi g h to b eg i n soft- star t and enab l e m axi m um ( 100% ) m ai n LE D cur r ent.
S ub seq uent p ul ses on E N M cause the m ai n LE D cur r ent to d ecr ease i n 32
l i near step s. Because of the soft- star t d el ay, i t i s p ossi b l e to tur n on the IC and
q ui ckl y set a d i m l evel so the m ai n LE D cur r ent never tr ansi ti ons thr oug h the
m axi m um setti ng . S ee the E N M /E N S D i m m i ng C ontr ol secti on.
D i r ect P WM i np ut. P W M contr ol s outp ut cur r ent as a p er centag e of ful l - scal e
cur r ent i n p r op or ti on to P W M si g nal d uty cycl e. The fr eq uency r ang e i s 900H z
to 200kH z.
P WM Fi l ter C ap aci tor C onnecti on. C onnect a cap aci tor fr om C P W M to G N D to
for m a fi l ter w i th the i nter nal 150kΩ r esi stor . The r ecom m end ed cap aci tor for
10H z cor ner i s 0.1µF.
S ub LE D C athod e C onnecti ons and C har g e- P um p Feed b ack. C ur r ent fl ow i ng
i nto LE D _ i s b ased on the E N S ( or P W M ) d escr i p ti on ab ove. The char g e p um p
r eg ul ates the l ow est LE D _ vol tag e to 0.12V . C onnect LE D _ to O U T i f the
cor r esp ond i ng LE D i s not p op ul ated .
M ai n LE D C athod e C onnecti ons and C har g e- P um p Feed b ack. C ur r ent fl ow i ng
i nto LE D _ i s b ased on the E N M ( or P W M ) d escr i p ti on ab ove. The char g e p um p
r eg ul ates the l ow est LE D _ vol tag e to 0.12V . C onnect LE D _ to O U T i f the
cor r esp ond i ng LE D i s not p op ul ated .
E xp osed P ad d l e. C onnect to GN D d i r ectl y und er the IC .
Pin Description (continued)
F U N C T IO N