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Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3361
1.4MHz 800mA High Efficiency Synchronous Step-Down Regulator in SOT23-5 FEATURES

DESCRIPTION
The KB3361 SwitchReg is a member of Kingbor(KB) product family. It is a 1.4MHz stepdown converter with an input voltage range of 2.5V to 6.5V and output as low as 0.6V. Its low supply current, small size, and high switching frequency make the KB3361 the ideal choice for portable applications. The KB3361 is available in either a programmable version with external feedback resistors. It can deliver up to 800mA of load current while maintai27A no load quiescent current. The 1.4MHz ning a low 75 The 1.4MHz switching frequency minimizes the size of external components while keeping switching losses low.The KB3361 feedback and control delivers excel lent load regulation and transient response with a small output inductor and capacitor. The KB3361 is designed to maintain high efficiency throughout the operating range and provides fast turn-on time. The KB3361 is available in a low profile (1.3mm) SOT23-5 package and is rated over the -40C to +85C temperature range.
High Efficiency: Up to 97% 75 A No Load Quiescent Current 800mA Output Current 2.5V to 6.5V Input Voltage Range 1.4MHz Switching Frequency No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle 0.6V Reference Allows Low Output Voltages Shutdown Mode Draws 1A Supply Current Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protected Low Profile (1.3mm) SOT23-5 Package
APPLICATIONS

Cellular Telephones Personal Information Appliances Wireless and DSL Modems Digital Still Cameras MP3 Players Portable Instruments
TYPICAL APPLICATION
100
22pF KB3361 1 RUN GND 2 VFB 5 450k 100k
EFFICIENCY (%)
VIN 3.6V to 6.5V
4
+
CIN 10 F
VIN
SW
3
4.7H
VOUT 3.3V 800mA COUT 10F CER
VIN = 3.6V
90 80 70 60 50
VIN = 5.0V VIN = 4.2V
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
Figure 1a. High Efficiency Step-Down Converter
Figure 1b. Efficiency vs Load Current
2007-Aug, Rev 1.0
1
KB3361
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3361
Minimum ESD Rating (Human Body Mode) ..........2KV Operating Temperature Range .............. - 40C to 85C Junction Temperature ........................................ 125 C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage ................................ - 0.3V to 6.5V RUN, VFB Voltages ..................................... - 0.3V to VIN SW Voltage .................................. - 0.3V to (VIN + 0.3V) P-Channel Switch Source Current (DC) ............. 1A N-Channel Switch Sink Current (DC) ................. 1A
PACkAGE/ORDER INFORMATION
TOP VIEW
ORDER PART NUMBER
5 VFB 4 VIN
Marking
RUN 1 GND 2 SW 3
KB3361 TOP MARKING 361
xxxx
S5 PACKAGE
TJMAX = 125C, JA = 250C/ W, JC = 90C/ W
SOT23-5
ELECTRICAL CHARACTERISTICS
TA = -40C to +85C, unless otherwise noted. Typical values are TA = 25C, VIN = 3.6V. Symbol Description Conditions Min
2.5 VIN Rising Hysteresis VIN Falling IOUT = 0 to 800mA, VIN = 2.7V to 6.5V No Load, 0.6V Adjustable Version EN = AGND = PGND 0V 100 1.8 -3.5 0.6 27 75 +3.5 VIN 70 90 1.0 800 0.45 0.40 0.1 588 600 612 0.2 250 150 1.0 1.4 140 15 2.0
Step-Down Converter VIN Input Voltage VUVLO VOUT VOUT IQ ISHDN ILIM RDS(ON)H RDS(ON)L VLinereg VOUT IOUT ROUT TS FOSC TSD THYS EN VEN(L) VEN(H) IEN Enable Threshold Low Enable Threshold High Input Low Current UVLO Threshold
2007-Aug, Rev 1.0
xxxx
Date Code with one bottom line
Typ
Max
6.5 2.5
Units
V V mV V % V A A mA %/V mV A k s MHz C C V V A
Output Voltage Tolerance Output Voltage Range Quiescent Current Shutdown Current P-Channel Current Limit High Side Switch On Resistance Low Side Switch On Resistance Line Regulation Out Threshold Voltage Accuracy Out Leakage Current Out Impedance Start-Up Time Oscillator Frequency Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis
VIN = 2.7V to 6.5V 0.6V Output, No Load TA = 25C 0.6V Output >0.6V Output From Enable to Output Regulation TA = 25C
0.6 VIN = VOUT = 5.5V 1.4 -1.0 1.0
2
KB3361
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3361
TYPICAL PERFORMANCE CHARACTERISTICS
(From Figure1a Except for the Resistive Divider Resistor Values)
Efficiency vs. Load
(VOUT = 1.8V; L = 4.7H)
100 1.0
DC Regulation
(VOUT = 1.8V) VIN = 4.2V
0.5
VIN = 2.7V Output Error (%)
90
Efficiency (%)
80 70 60 50
VIN = 3.6V
VIN = 3.6V
VIN = 4.2V
0.0
-0.5
VIN = 2.7V
0.1
1
10
100
1000
-1.0
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Efficiency vs. Load
(VOUT = 2.5V; L = 4.7 6.8H)
100 2.0
DC Regulation
(VOUT = 2.5V)
1.5
VIN = 3.0V
Output Error (%)
90
Efficiency (%)
1.0 0.5 0.0 -0.5 -1.0 -1.5
VIN = 5.0V VIN = 4.2V
80 70 60 50
VIN = 4.2V VIN = 5.0V VIN = 3.6V
VIN = 3.6V
VIN = 3.0V
0.1
1
10
100
1000
-2.0
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Efficiency vs. Load
(VOUT = 3.3V; L = 4.7 6.8H)
100 1.0
DC Regulation
(VOUT = 3.3V; L = 4.7 6.8H)
VIN = 3.6V
Output Error (%)
90
Efficiency (%)
0.5
80 70 60 50
VIN = 5.0V VIN = 4.2V
VIN = 4.2V
0.0
-0.5
VIN = 5.0V
0.1
1
10
100
1000
-1.0 0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
2007-Aug, Rev 1.0
3
KB3361
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3361
Output Ripple
(VIN = 3.6V; VOUT = 1.8V; IOUT = 800mA)
Output Voltage (AC coupled) (top) (mV)
TYPICAL PERFORMANCE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Line Response
(VOUT = 1.8V @ 800mA)
1.86 1.84 1.82 1.80 1.78 1.76 1.74 1.72 1.70 1.68 1.66 7.6 7.1 6.6
20 10 0 -10 -20 -30 -40 -50 -60
1.3 1.2
Inductor Current (bottom) (A)
Output Voltage (top) (V)
6.1 5.6 5.1 4.6 4.1 3.6 3.1 2.6
1.1 1.0 0.9 0.8 0.7 0.6 0.5
Input Voltage (bottom) (V)
Time (50s/div)
Time (500ns/div)
Output Ripple
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1mA)
P-Channel RDS(ON) vs. Input Voltage
0.30 0.25
Output Voltage (AC coupled) (top) (mV)
40 20 0 -20 -40 -60 -80 -100 -120
750 700 650
RDS(ON) (m)
0.20 0.15 0.10 0.05 0.00 -0.05 -0.10
120C
100C
Inductor Current (bottom) (A)
600 550 500 450 400 350 300 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 25C 85C
Time (10s/div)
Input Voltage (V)
N-Channel RDS(ON) vs. Input Voltage
750 650 700 120C
No Load Quiescent Current vs. Input Voltage
100 95 90 85 80 75 70 65 60
RDS(ON) (m)
600 550 500 450 400 350 300 2.5 3.0 3.5 25C 85C
100C
Supply Current ( A)
85C
25C
-40C
2.5 3.1 3.5 3.9 4.3 4.7 5.1 6.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Input Voltage (V)
PIN FUNCTIONS
RUN (Pin 1): Run Control Input. Forcing this pin above 1.5V enables the part. Forcing this pin below 0.6V shuts down the device. In shutdown, all functions are disabled drawing <1A supply current. Do not leave RUN floating. GND (Pin 2): Ground Pin. SW (Pin 3): Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches.
2007-Aug, Rev 1.0 4 KB3361
VIN (Pin 4): Main Supply Pin. Must be closely decoupled to GND, Pin 2, with a 4.7F or greater Tan capacitor. VFB (Pin 5) (KB3361): Feedback Pin. Receives the feedback voltage from an external resistive divider across the output.
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3361
SIMPLIFIED BLOC DIAGRAM
SLOPE COMP OSC OSC
0.65V
FREQ SHIFT 5 VFB /VOUT R1 FB R2 0.6V
4 VIN
- + - +
EA 0.4V
- +
BURST S R Q Q
SLEEP
-
ICOMP
+
5
RS LATCH VIN
SWITCHING LOGIC AND BLANKING CIRCUIT
ANTISHOOTTHRU
3 SW
1 RUN
0.6V REF
SHUTDOWN
TYPICAL APPLICATION
Tiny 3.3V/800mA Buck Regulator
VIN 3.6V to 6.5V 4 VIN SW 3 4.7H 22pF KB3361 1 RUN GND 2 VFB 5 450k 100k ** TAIYO YUDEN JMK316BJ106ML VOUT 3.3V 800mA COUT** 10F CER
+
CIN 4.7F
100
VIN = 5V 95 VOUT = 3.3V 90
VOUT 100mV/DIV AC COUPLED IL 500mA/DIV
EFFICIENCY (%)
85 80 75 70 65 60 0.1 1 10 100 OUTPUT CURRENT (mA) 1000
ILOAD 500mA/DIV VIN = 5V 20s/DIV VOUT = 3.3V ILOAD = 200mA TO 800mA
2007-Aug, Rev 1.0
5
-
IRCMP
+
2 GND
KB3361
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3361
PACAGE DESCRIPTION
S5 Package 5-Lead Plastic TSOT-23(SOT23-5)
0.62 MAX
0.95 REF
2.90 BSC (NOTE 4)
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 - 1.75 (NOTE 4)
PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 - 0.45 TYP 5 PLCS (NOTE 3)
0.95 BSC
0.80 - 1.20 0.20 BSC 1.30 MAX DATUM `A' 0.01 - 0.10
0.30 - 0.50 REF 0.09 - 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC
Kingbor Technology
TEL:(86)0755-26508846 FAX:(86)0755-26509052 www.kingbor.com
6
2007-Aug, Rev 1.0

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