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Fairchild Semiconductor |
December 2007
www.datasheet4u.com
FAN2103 — TinyBuck™
3A, 24V Input Integrated Synchronous Buck Regulator
Features
Over 95% efficiency
Internal power MOSFETs:
High-side RDS(ON) = 31mΩ
Low-side RDS(ON) = 23mΩ
Integrated low-side Schottky diode
Programmable frequency operation up to 750KHz
Power-good signal
Wide input range: 3.0V to 24V
Output voltage range: 0.8V to 90%VIN
Input under-voltage lockout (UVLO)
Programmable over-current protection
Under-voltage, over-voltage, and thermal protection
Selectable light-load power-saving mode
5x6mm, 25-pin, 3-pad MLP
Applications
Thin and light Notebook PCs
Graphics cards
Battery-powered equipment
Set-top box
Point-of-load regulation
Description
The FAN2103 TinyBuck™ is an easy-to-use, cost- and
space-efficient, synchronous buck solution. It enables
designers to solve high-current requirements in a small
area with minimal external components.
External programming of clock frequency, current limit,
and loop response allows for optimization and flexibility
selecting output filter components and transient response.
The summing current mode modulator uses lossless
current sensing for current feedback and over-current,
and includes voltage feedforward.
Fairchild’s advanced BiCMOS power process,
combined with a thermally efficient MLP package,
provides low-RDS(ON), internal MOSFETs, and the ability
to dissipate high power in a small package.
Under-voltage, thermal shutdown, and power-good are
blanked at start-up, but protect the device from damage
during fault conditions.
Related Application Notes
AN-5067 – PCB land pattern design and surface
mount guidelines for MLP packages
Ordering Information
Part Number
FAN2103MPX
FAN2103EMPX
Operating
Temperature Range
-10°C to 85°C
-40°C to 85°C
Package
Packing Method
25-Pin Molded Leadless Package (MLP) 5x6mm Tape and Reel
25-Pin Molded Leadless Package (MLP) 5x6mm Tape and Reel
All packages are lead free per JEDEC: J-STD-020B standard.
© 2007 Fairchild Semiconductor Corporation
FAN2103 Rev. 1.0.3
www.fairchildsemi.com
Typical Application Diagram
www.datasheRetR4uA.McPom
+5V
C4
VCC 15
RILIM
RAMP 25
PGOOD 13
EN 14
ILIM 17
RT R(T) 18
C2
C1
R2
COMP 20
AGND 16
Q1
Q2
PWM
MODULATOR
P2 VIN
1 BOOT
CHF
VIN
CIN
P1 SW
CBOOT
L
VOUT
P3 PGND
24 PWM#
19 FB
RBIAS
COUT
R1
C3
R3
Figure 1. Typical Application
Block Diagram
© 2007 Fairchild Semiconductor Corporation
FAN2103 Rev. 1.0.3
Figure 2. Block Diagram
2
www.fairchildsemi.com
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