BS3406
1.7MHZ, 600mA synchronous step-down converter FEATURES DESCRIPTION
◆High Efficiency: Up to 95%              The BS3406 is a high efficiency synchronous
◆2.5V to 6V Input Voltage  Range        rectifier current mode PWM regulator.The BS3406 ◆600mA Available Load Current          can operate under 2.5V to 6V input voltage. For
◆1.7MHz Constant Sw itching Frequency BS3406DJ-1.5 and BS3406DJ-1.8, they can supply ◆Output  Voltage  as Low as 0.6V        1.5V  and 1.8V output voltage respecti vely. The ◆100% Duty Cycle in Dropout            output of BS3406DJ is adjustable o ver a w ide
◆ON/OFF Control range of 0.6V to 6V. The load current is up to
◆Cycle By Cycle Current  Limit          600m A.
◆Auto Reco very Short Circuit Protection The BS3406 sw itches at a fixed 1.7MHZ frequency ◆Thermal Fault Protection w hich allow s designers to use small, low cost
◆Input Under Voltage Lockout            inductor and capacitor.
◆Integrated  Soft-start                  It is ideal for portable devices that dri ven by a
◆<0.1µA Shutdow n Current single cell Lithium(Li+) battery.
◆Space Saving 5-Pin TSOT23  Package    The BS3406 is available in a low profile  (1mm)
5-pin, TSOT package.
APPLICATIONS
◆Portable Instruments
◆MP3 Players
◆Digital Still and Video Cameras
◆Microprocessors and DSP Core Supplies
◆Cellular and Smart Phones
◆PDAs
TYPICAL APPICATION
BS3406DJ
PACKAGE REFERENCE
TOP VIEW
Part  Number*  Ambient Temp. Output Voltage(V)
Package  Marking
BS3406DJ -40℃--80℃ 0.6---6 TSOT-23 XXXX BS3406DJ-1.5 -40℃--80℃    1.5 TSOT-23 XXXX BS3406DJ-1.8 -40℃--80℃
1.8 TSOT-23 XXXX
＊For Tape & Reel, add suffix –Z (eg. BS3406DJ–Z) ,  For Lead Free, add suffix –LF (eg.BS3406DJ–LF–Z)
PIN DESCRIPTIONS
Pin# Name
Description
1 EN
Regulator Enable Control Input. Drive EN above 1.5V to turn on the IP400. Drive EN below  0.3V to turn it off (shutdown current < 0.1µA).
2 GND
Ground. 3 SW
Power Switch Output. Inductor connection to drains of the internal PFET and NFET switches. 4 IN
Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor. 5 FB
Feedback Input (BS3406DJ). Connect FB to the center point of the external resistor divider. The feedback threshold voltage is 0.6V.
5 OUT
Output Voltage Sense Input (BS3406DJ-1.5 and BS3406DJ-1.8).  An  internal  resistor  divider is  connected to this pin to set the proper output voltage.
1 2
3 45GND EN FB/OUT SW IN
Parameter Min.
Max.
Unit VIN to GND -0.3 +6.5 V
Vsw  to GND -0.3 Vin+0.3 V
VFB, VEN to GND -0.3 +6.5 V
SW Peak Current    1.4    A
Junction Temperature +150 ℃
Lead Temperature（2） +260 ℃
Storage Temperature -65 150 ℃
Recommended Operating Conditions（3）
Parameter Min. Max.
Unit
Supply Voltage VIN    2.5    6 V
Output Voltage VOUT 0.6    6 V
囚徒微博
Operating Temperature -40 85 ℃
Notes:哭着眼睛说拜拜
1) Exceeding these ratings may damage the device.
2) For recommended IR reflow temperature information, refer to BOE document BS3406_IRRTP.
3) The device is not guaranteed to function outside of its operating conditions.
ELECTRICAL CHARACTERISTICS（5）
V IN = V EN = 3.6V, T A = +25°C, unless otherwise noted.
Parameter Conditions
Min.
Type
Max.
Unit
Supply Current VEN = VIN, VFB = 0.65V 400 600 µA
李湘何炅Shutdown Current VEN = 0V, VIN = 6V 0.01    1 µA
IN Under Voltage Lockout
Threshold
Rising Edge    2.10    2.27    2.45 V
IN Under Voltage Lockout Hysteresisflac音乐下载
55
mV TA = +25°C, 0.588 0.600 0.612
Regulated FB Voltage
–40°C ≤ TA ≤ +85°C 0.582 0.600 0.618
V ELECTRICAL CHARACTERISTICS (continued) (4)
Parameter Condition Min. Type Max. Unit
BS3406DJ-1.5 IOUT = 50mA
–40°C ≤ TA ≤ +85°C 1.455    1.500    1.545
Regulated Output Voltage
BS3406DJ-1.8 IOUT = 50mA
–40°C ≤ TA ≤ +85°C 1.746    1.800    1.854
V
PFET On Resistance ISW = 100mA 0.44 Ω
NFET On Resistance ISW = –100mA 0.29 Ω
SW Leakage Current VEN = 0V, VIN = 6V
VSW = 0V or 6V
艾薇儿大量照片外泄–1  +1 µA
Junction To Case 110
Thermal Resistor(5)
Junction To Ambient 220
℃/W
PFET Current Limit Duty Cycle = 100%,
Current Pulse Width < 1ms
0.7    1.0 1.35 A Oscillator Frequency    1.26    1.70    2.08 MHz
Thermal Shutdown Trip Threshold 145
℃
EN Trip Threshold –40°C ≤ TA ≤ +85°C 0.3 0.96    1.5 V EN Input Current VEN = 0V to 6V –1 +1 µA
Notes:
4) 100% production test  at  +25°C.  Typical  and  temperature  specifications  are  guaranteed  by  design  and  characterization.
5) Measured on approximately 1” square of 1 oz copper.
TYPICAL PERFORMANCE CHARACTERISTICS
V IN = 3.3V, V OUT = 1.8V, L1 = 10µH, C1 = 4.7µF, C3 = 10µF, T A = +25°C, unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
tears of joyV IN = 3.3V, V OUT = 1.8V, L1 = 10µH, C1 = 4.7µF, C3 = 10µF, T A = +25°C, unless otherwise noted.
FUNCTION BLOCK DIAGRAM