FAN5308_07 FAIRCHILD [Fairchild Semiconductor], FAN5308_07 Datasheet

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FAN5308_07

Manufacturer Part Number
FAN5308_07
Description
800mA High-Efficiency Step-Down DC-DC Converter
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
1.FAN5308_07.pdf (11 pages)
© 2005 Fairchild Semiconductor Corporation
FAN5308 Rev. 1.0.2
FAN5308
800mA High-Efficiency Step-Down DC-DC Converter
Features
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Applications
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Ordering Information
Typical Application
96% efficiency, synchronous operation
Adjustable output voltage options from 0.8V to V
2.5V to 5.5V input voltage range
Up to 800mA output current
Fixed-frequency 1.3MHz PWM operation
High-efficiency, power-save mode
100% duty cycle low-dropout operation
Soft-start
Output over-voltage protection
Dynamic output voltage positioning
25µA quiescent current
Thermal shutdown and short-circuit protection
Pb-free 3x3mm 6-lead MLP package
Pocket PCs, PDAs
Cell phones
Battery-powered portable devices
Digital cameras
Hard disk drives
Set-top boxes
Point-of-load power
Notebook computers
Communications equipment
Product Number
FAN5308
10μF
C
IN
Output Voltage
Adjustable
PGND
V
EN
IN
Figure 1. Typical Application
1
2
3
(AGND)
P1
IN
6
5
4
SW
NC
FB
3.3μH
Description
Designed for use in battery-powered applications, the
FAN5308 is a high-efficiency, low-noise synchronous
PWM current mode and pulse skip (power-save) mode
DC-DC converter. It can provide up to 800mA of output
current over an input range from 2.5V to 5.5V. The output
voltage can be externally adjusted over a range of 0.8V
to 5.5V by means of an external voltage divider.
At moderate and light loads, pulse skipping modulation is
used. Dynamic voltage positioning is applied and the
output voltage is shifted 0.8% above nominal value for
increased headroom during load transients. At higher
loads, the system automatically switches over to current
mode PWM control, operating at 1.3MHz. A current
mode control loop with fast transient response ensures
excellent line and load regulation. To achieve high effi-
ciency and ensure long battery life, the quiescent current
is reduced to 25µA in power-save mode, and the supply
current drops below 1µA in shut-down mode. The
FAN5308 is available in a 3x3mm 6-lead MLP package.
3x3mm 6-Lead MLP
Package Type
R2
R1
10KΩ
5KΩ
C
2 x 10μF
OUT
1.2V (800mA)
V
OUT
FAN5308MPX
Order Code
www.fairchildsemi.com
June 2007
tm

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FAN5308_07 Summary of contents

Page 1

FAN5308 800mA High-Efficiency Step-Down DC-DC Converter Features ■ 96% efficiency, synchronous operation ■ Adjustable output voltage options from 0. ■ 2.5V to 5.5V input voltage range ■ 800mA output current ■ Fixed-frequency 1.3MHz PWM operation ■ ...

Page 2

Pin Configuration Pin Description Pin # Name P1 AGND Analog Ground. P1 must be soldered to the PCB ground Supply Voltage Input PGND Power Ground. This pin is connected to the internal MOSFET switches. This pin ...

Page 3

Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure ...

Page 4

Electrical Characteristics 0.6V (minimum 2.5V) to 5.5V OUT wise noted. Typical values are at T Symbol Parameter V Input Voltage IN I Quiescent Current Q I Shutdown Supply Current SD Under-Voltage Lockout V UVLO ...

Page 5

Typical Performance Characteristics T = 25° 10µ 20µ 3.3µ OUT 100 3. 3.6V OUT ...

Page 6

Typical Performance Characteristics T = 25° 10µ 20µ 3.3µ OUT Time (1μs/div) Figure 9. PWM Mode 100mA V = 1.2V OUT Time (10μs/div) Figure 11. Load Transient Response Time (100μs/div) Figure ...

Page 7

Block Diagram DIGITAL SOFT START FB ERROR AMP 0.8V GND IS OSC SLOPE COMPENSATION Detailed Operation Description The FAN5308 is a step-down converter operating in a current-mode PFM/PWM architecture with a typical switching frequency of 1.3MHz. At moderate to heavy ...

Page 8

The N-channel transistor is turned off before the inductor current becomes negative. At this time, the P-channel is switched on again, starting the next pulse. The converter continues these pulses until the high threshold (typical 1.6% above nominal value) is ...

Page 9

Applications Information Setting the Output Voltage The internal reference is 0.8V (typical). The output volt- age is divided by a resistor divider, R1 and R2 to the FB pin. The output voltage is given by ...

Page 10

Mechanical Dimensions Dimensions are in millimeters unless otherwise noted. © 2005 Fairchild Semiconductor Corporation FAN5308 Rev. 1.0.2 Figure 18. 3x3mm 6-Lead MLP 10 www.fairchildsemi.com ...

Page 11

Fairchild Semiconductor Corporation FAN5308 Rev. 1.0.2 11 www.fairchildsemi.com ...

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