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PDF SM8150A Data sheet ( Hoja de datos )
| Número de pieza | SM8150A | |
| Descripción | PMIC | |
| Fabricantes | NPC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SM8150A (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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SM8150A
PMIC with White LED Driver
1. OVERVIEW
The SM8150A is a charge pump type white LED driver, with 2-system programmable LDOs (Low Dropout
Regulator), and step-down DC/DC converter power management IC. The white LED driver provides constant-
current drive for 1 to 6 backlight white LED connected in parallel and 1 torch/strobe white LED. The charge
pump automatically selects between ×1 mode, ×1.5 boost mode, and ×2 boost mode in response to battery volt-
age, LED
drive life.
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current, LDO voltage, output ON/OFF, and other settings to be controlled from a microcontroller.
*1. I2C-BUS is a registered trademark of NXP B. V.
2. FEATURES
I Optimum specifications for clamshell cellular
phone with camera
• LCD backlight: Main-4ch/Sub-2ch (max 25mA/ch)
• Camera flash: 1ch (max 300mA)
I Power saving design by automatic mode selection
of charge pump
• Power at ×1.5 mode is reduced by 25% from ×2 mode
• Power at ×1 mode is reduced by 50% from ×2
mode, 33% from ×1.5 mode
I I2C interface best match for cellular phone chipset
I Selecting current value (torch/strobe) of flash LED
by SBN pin
I Shutdown synchronized to microcontroller supply
by VEN pin
I 1 system of step-down DC/DC converter built-in
• Output: 1.2 to 3.0V@ max 500mA
I 2 systems of programmable LDO built-in
• Output: 1.5/1.8/2.5/2.6/2.8/3.0/3.1/3.3V@ max 300mA
I Various protection circuits built-in
• Startup soft start circuit built-in
• Overtemperature thermal shutdown (TSD) cir-
cuit built-in
• Supply undervoltage lockout (UVLO) circuit built-in
I Supply voltage range (VIN1 to VIN3): 2.7 to 4.6V
Logic operating voltage range (VEN) : 1.8 to 4.6V
I White LED Driver
• Charge-pump frequency: 1.0MHz (typ)
• Charge-pump maximum output current: 450mA
• Backlight LED current: 25 ± 1.5mA/ch (max)
• Backlight LED relative accuracy: ± 3%
• Flash LED current: 300 ± 20mA (max)
I DC/DC converter
• DC/DC converter output voltage: 1.2 to 3.0V (typ)
• DC/DC converter output current: 500mA (max)
• DC/DC converter operating frequency: 2.0MHz (typ)
• DC/DC converter voltage accuracy: ± 2%
I LDO
• LDO output voltage: 1.5 to 3.3V (VIN = 3.6V)
• LDO output current: 300mA (max)
• LDO dropout voltage: 0.1V (typ)
• LDO voltage accuracy: ± 2%
I Package: 28-pin QFN
3. TYPICAL APPLICATION CIRCUIT
1µF 1µF
3.6V
C1P C1M C2P C2M
4.7µF
VIN1
PGND1
VOUT
2.2µF
2.2µF
VIN2
PGND2
VIN3
DIN1
DIN2
DIN3
DIN4
DIN5
Logic supply
VEN
0.1µF
SM8150A
DIN6
DIN7
2.2µF
SCL
I2C
SDA
Strobe
ON/OFF
SBN
0.1µF
VREF
GND1
LDOUT1
LDOUT2
LDO1 output
2.2µF
LDO2 output
2.2µF
100kΩ
FB
8pF 200kΩ
LX
GND2
2.2µH 2.2µF
DCOUT
(1.8V)
4. APPLICATIONS
I Cellular phone
I Mobile equipment
5. ORDERING INFORMATION
Device
SM8150AB
Package
28-pin QFN
SEIKO NPC CORPORATION —1
1 page  
SM8150A
10. RECOMMENDED OPERATING CONDITIONS
VIN1 = VIN2 = VIN3, GND = PGND = 0V
Parameter
Supply voltage*1
Logic operating voltage
Input voltage
Strobe time*2
Torch LED current*2
Operating temperature
Pin Symbol
Conditions
VIN1 to 3
VEN
SBN, SCL,
SDA
DIN7
−
VIN_×1
VIN_×1.5
VIN_×2
VEN
×1 mode, IOUT = 0mA
×1.5 mode, IOUT = 150mA
×2 mode, IOUT = 450mA
VDATA
tSTROBE
ILED7
Ta
ILED7 ≥ 150mA
tTORCH > 250ms
min
2.7
3.0
3.3
1.8
0
−
−
−30
Rating
typ
3.6
3.6
3.6
2.8
−
−
−
25
max
4.6
4.6
4.6
4.6
VEN
250
150
+85
Unit
V
V
V
V
V
ms
mA
°C
*1. Supply voltage and IOUT (LED)
When the white LED drive current is increased, the required supply voltage also increases. The supply is automatically switched in charge pump boost
mode, and cannot be manually selected. The forward-bias voltage drop VF of the LED is assumed to be ≤ 3.5V.
500
400
300
200
100
0
2.5 3 3.5 4 4.5 5
VIN [V]
IOUT (LED) vs. VIN
*2. Torch and Strobe
Pin DIN7 is provided for connection to a high-current white LED. Two types of light modulation (dimming) data are available, switched by the SBN input
voltage. When SBN is HIGH, torch mode is selected. When SBN is LOW, strobe mode is selected. The recommended operating condition is high cur-
rent with short ON times in strobe mode, and low current with longer ON times in torch mode. In strobe mode (SBN = LOW), high-current supply is the
main priority and, therefore, the current consumption is not optimized (see “Torch/Strobe Selecting”).
I2C data settings
DIN7 − Enable 1 1 1 * * 1 * *
DIN7 − Disable 1 1 1 * * 0 * *
SBN
H
L
H
L
Torch
ON
OFF
OFF
OFF
Strobe
OFF
ON
OFF
OFF
Dimming Recommended operating conditions
Torch
Strobe
ILED7 < 150mA
Operating time < 250ms
−−
−−
SEIKO NPC CORPORATION —5
5 Page 
SM8150A
11-5. LDO
VIN =3.6V, VEN = 2.8V, GND = PGND = 0V, Ta = 25°C unless otherwise noted.
Parameter
Pin Symbol
Condition
Current consumption*1
GND pin current
Soft start time*2
Output voltage
Output current
Dropout voltage
Line Regulation
Load Regulation
Overcurrent protection circuit
operating current
VIN
LDOUT1 to 2
IDD_LDO
IGND_LDO
tSS_LDO
VLDO
ILDO
VDROP
∆VOUT1
∆VOUT2
No load
ILDO = 50mA,
IGND_LDO = IDD_LDO − ILDO
ILDO = 1mA
ILDO = 1mA, VLDO ≤ VIN – 0.3V
VIN = 3V,
VLDO (setting)
= 3.3V
ILDO = 100mA
ILDO = 200mA
ILDO = 300mA
3.6V ≤ VIN ≤ 4.6V,
VLDO (setting) = 3V, ILDO = 30mA
VLDO (setting) = 3V,
5mA ≤ ILDO ≤ 100mA
VLDO (setting) = 3V,
5mA ≤ ILDO ≤ 200mA
IOS
*1. DIN1 to 7 and the DC/DC converter is disabled.
*2. The time taken from when either of LDOUT1 to 2 is enabled until the output is stabilized.
Rating
min typ max
– 0.35 0.8
Unit
mA
– 0.35 1.2 mA
– 1 – ms
See “Output voltage table”.
– – 300 mA
– 0.1 0.2 V
– 0.2 0.4 V
– 0.3 0.6 V
– 20 60 mV
– 10 30 mV
– 20 60 mV
350 650 950 mA
Output voltage table
Setting
min
typ
max unit
1.5 1.470 1.5 1.530
V
1.8 1.764 1.8 1.836
V
2.5 2.450 2.5 2.550
V
2.6 2.548 2.6 2.652
V
2.8 2.744 2.8 2.856
V
3.0 2.940 3.0 3.060
V
3.1 3.038 3.1 3.162
V
3.3 3.234 3.3 3.366
V
SEIKO NPC CORPORATION —11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet SM8150A.PDF ] | |
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