PART OBSOLETE - USE
PAM2803
AND
ZXSC380
PAM2805
3-MODES/ 3W WLED DRIVER WITH 1 OR 2 CELL BATTERY
Description
The PAM2805 is a step-up DC-DC WLED driver with 3 modes cycling
function (100% brightness, 25% brightness and 8.5Hz blinking).
The unique 3 modes cycling function can eliminate the needs of extra
functional MCU or IC.
Pin Assignments
OBSOLETE – PART DISCONTINUED
The PAM2805 can deliver up to 750mA output current by setting an
external resistor.
The PAM2805 switches at a 1.0MHz constant frequency, allowing for
the use of small value external inductor and ceramic capacitors.
A low 95mV feedback voltage reduces the power loss in the R
S
for
better efficiency. With its internal 2A, 100mΩ device can provide high
efficiency even at heavy load.
The PAM2805 is available in SOT23-6 package.
Features
3 Modes Cycling Function:
Power Off
<5S
Power Off
<5S
Applications
White LED Torch (Flashlight)
Bright
Dimming
Power Off
<5S
Blinking
Reset to Bright Mode if Power Off time More Than 5S
Adjustable Output Current: Up to 750mA
8.5Hz Blinking Mode
Low Start-Up Voltage: 0.9V(typ)
Low SW on Resistance: 100mΩ
Over Temperature Protection
Over Voltage Protection
SOT23-6 Package
Pb-Free Package
PAM2805
Document number: DS36401 Rev. 3 - 4
1 of 10
www.diodes.com
September 2018
© Diodes Incorporated
PART OBSOLETE - USE
PAM2803
AND
ZXSC380
PAM2805
Typical Applications Circuit
OBSOLETE – PART DISCONTINUED
ILED + 95mV/R
S
Pin Descriptions
Pin
Number
1
2
3
4
5
6
Pin
Name
VIN
GND
BLK
FB
VOUT
SW
Input Voltage
Power Ground
Connect a 1µF CAP for Blinking
Feedback
Output Voltage
Connected to an Internal NMOS Switch
Function
PAM2805
Document number: DS36401 Rev. 3 - 4
2 of 10
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September 2018
© Diodes Incorporated
PART OBSOLETE - USE
PAM2803
AND
ZXSC380
PAM2805
Functional Block Diagram
OBSOLETE – PART DISCONTINUED
Absolute Maximum Ratings
(@T
A
= +25° unless otherwise specified.)
C,
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability. All voltages are with respect to ground.
Parameter
Supply Voltage
Output Voltage
Storage Temperature Range
Lead Temperature (Soldering, 5s)
Rating
6
6
-65 to +150
+300
Unit
V
°
C
Recommended Operating Conditions
(@T
A
= +25° unless otherwise specified.)
C,
Parameter
Operation Temperature Range
Junction Temperature Range
Rating
-40 to +85
-40 to +125
Unit
°
C
PAM2805
Document number: DS36401 Rev. 3 - 4
3 of 10
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September 2018
© Diodes Incorporated
PART OBSOLETE - USE
PAM2803
AND
ZXSC380
PAM2805
Thermal Information
Parameter
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to Ambient)
Symbol
θ
JC
θ
JA
P
D
Package
SOT23-6
SOT23-6
SOT23-6
Max
130
250
400
Unit
°
C/W
mW
OBSOLETE – PART DISCONTINUED
Internal Power Dissipation @ T
A
=+25°
C
Electrical Characteristics
(@T
A
= +25° L = 2.2µH, C
IN
= 10µF, C
OUT
= 10µF, C
BLK
= 1µF, V
F
= 3.4V unless otherwise specified.)
C,
Parameter
Input Voltage Range
Feedback Voltage
Start-Up Voltage
Hold Voltage
Oscillator Frequency
Over Temperature Shutdown
Over Temperature Hysteresis
Maximum Output Current Range
Quiescent Current
Switch On Resistance
Current Limit
Over Voltage Protection (VOUT)
Blinking Frequency
Note:
1. V
F
-LED forward voltage.
Symbol
V
IN
V
FB
V
START
V
HOLD
f
OSC
OTS
OTH
I
O(MAX)
I
Q
R
DS(ON)
I
LIM
V
OVP
F
BLK
-
-
Test Conditions
Min
0.9
90
-
-
0.85
-
-
750
-
-
2
-
-
Typ
-
95
0.9
0.7
1.0
+150
+30
-
1
0.1
-
4.5
8.5
Max
V
F
-0.2
(Note 1)
100
-
-
1.15
-
-
-
3
-
-
-
10
Unit
V
mV
V
V
MHz
°
C
°
C
mA
mA
Ω
A
V
Hz
V
IN
: 0V →3V, I
LED
= 200mA
V
IN
: 3V
→ 0V, I
LED
: 750mA → 100mA
-
-
-
V
IN
= 2.4V
I
LED
= 0mA, VO = 3.4V, Device Switching
at 1MHz
V
O
= 3.4V
V
O
= 3.4V
-
C
BLK
= 1µF
PAM2805
Document number: DS36401 Rev. 3 - 4
4 of 10
www.diodes.com
September 2018
© Diodes Incorporated
PART OBSOLETE - USE
PAM2803
AND
ZXSC380
PAM2805
Typical Performance Characteristics
(@T
A
= +25° L = 2.2µF, C
IN
= 10µF, C
OUT
= 10µF, C
BLK
= 1µF, unless otherwise specified.)
C,
OBSOLETE – PART DISCONTINUED
PAM2805
Document number: DS36401 Rev. 3 - 4
5 of 10
www.diodes.com
September 2018
© Diodes Incorporated
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