T
TARGET SPECIFICATION
www.fairchildsemi.com
Features
Efficiency > 80% at 7.8V - 12V
28 Lead TSSOP Package
Applications
Notebook PCs
PDAs
Block Diagram
FB5 (27)
NC (28)
NC (1)
VIN (2)
IFB1 (26)
HSD1 (25)
BST1 (24)
SW1 (23)
LSD1 (22)
VFB1 (21)
ON/OFF1 (20)
COMP1 (19)
5VSTDBY (18)
COSC (17)
SGND (16)
DIGITAL
SS1
PGND (15)
(4) IFB2
Vin = 5/20V
±
5%
(3) FB12
(5) HSD2
R
S
(6) BST2
(7) SW2
(8) LSD2
(9) VFB2
(10) ON/OFF2
(11) COMP2
(12) OSCILLATOR
SYNC
(13) S/D
(14) PGOOD
OVP
OCP
–
+
a
I
FB2
DIGITAL
CTRL
BUR.
ST
Vth IFB2
OSC
COMP2
REF
DIGITAL
SS2
RC2951
5V
100 mA
Audio
3.3V
3.4A
I/O
5V
25mA
330
μ
F
10
μ
H
RC2951
12V
150 mA
PCMCIA
0.1
μ
F
Vout = 5V 1A
HDD+
10
μ
F
30
μ
H
20
μ
F
3.3
μ
F
RC5X 02
Multi PWM Regulator c ontroller
10/29/97 Rev. 0.0.0